/* roulang page: index */
:root {
            --primary: #1a6df5;
            --primary-dark: #1254c4;
            --primary-light: #e8f2ff;
            --primary-glow: rgba(26,109,245,0.15);
            --accent: #ff5c35;
            --accent-hover: #e64922;
            --accent-light: #fff1ed;
            --bg: #f6f8fb;
            --bg-alt: #eef1f7;
            --surface: #ffffff;
            --text: #1a1d28;
            --text-secondary: #5e6377;
            --text-muted: #9498a8;
            --border: #e2e6ef;
            --border-light: #eef0f5;
            --success: #10b981;
            --success-light: #ecfdf5;
            --warning: #f59e0b;
            --warning-light: #fffbeb;
            --radius: 14px;
            --radius-sm: 9px;
            --radius-xs: 6px;
            --radius-full: 50px;
            --shadow-xs: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
            --shadow-md: 0 6px 20px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
            --shadow-lg: 0 14px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.05);
            --shadow-xl: 0 22px 60px rgba(0,0,0,0.13), 0 6px 18px rgba(0,0,0,0.06);
            --transition-fast: 0.18s ease;
            --transition-normal: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
            --container-max: 1200px;
            --container-narrow: 960px;
            --nav-height: 66px;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul, ol {
            list-style: none;
        }
        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }

        /* ========== CONTAINER ========== */
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container--narrow {
            max-width: var(--container-narrow);
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-xs);
            height: var(--nav-height);
            transition: box-shadow var(--transition-normal);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
            gap: 20px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text);
            white-space: nowrap;
            flex-shrink: 0;
            transition: opacity var(--transition-fast);
        }
        .logo-link:hover {
            color: var(--primary);
            opacity: 0.85;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary) 0%, #3b8aff 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
            box-shadow: 0 3px 10px var(--primary-glow);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-xs);
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-links a.active {
            color: var(--primary);
            font-weight: 600;
            background: var(--primary-light);
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 20px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 600;
            background: var(--primary);
            color: #fff !important;
            transition: all var(--transition-normal);
            white-space: nowrap;
            border: 2px solid transparent;
        }
        .nav-cta-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px var(--primary-glow);
            color: #fff !important;
        }
        .mobile-menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-xs);
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            color: var(--text);
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }
        .mobile-menu-toggle:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }
        .mobile-menu-toggle i {
            transition: transform var(--transition-normal);
        }
        .mobile-menu-toggle.open i {
            transform: rotate(90deg);
        }

        /* ========== HERO ========== */
        .hero-section {
            background: linear-gradient(170deg, #eef4fc 0%, #f6f8fb 30%, #fff 100%);
            padding: 60px 0 56px;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -100px;
            left: -60px;
            width: 320px;
            height: 320px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255,92,53,0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-inner {
            display: flex;
            align-items: center;
            gap: 48px;
            position: relative;
            z-index: 1;
        }
        .hero-content {
            flex: 1;
            min-width: 0;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 600;
            background: var(--success-light);
            color: var(--success);
            margin-bottom: 18px;
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--success);
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.6); }
        }
        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 14px;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .hero-title .highlight {
            background: linear-gradient(135deg, var(--primary) 0%, #3b8aff 60%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 520px;
            line-height: 1.6;
        }
        .hero-search-wrap {
            display: flex;
            align-items: center;
            gap: 0;
            background: var(--surface);
            border-radius: var(--radius-full);
            box-shadow: var(--shadow-lg);
            border: 2px solid transparent;
            transition: all var(--transition-normal);
            max-width: 500px;
            overflow: hidden;
        }
        .hero-search-wrap:focus-within {
            border-color: var(--primary);
            box-shadow: var(--shadow-xl), 0 0 0 8px var(--primary-glow);
        }
        .hero-search-wrap input {
            flex: 1;
            border: none;
            outline: none;
            padding: 15px 20px;
            font-size: 1rem;
            color: var(--text);
            background: transparent;
            min-width: 0;
        }
        .hero-search-wrap input::placeholder {
            color: var(--text-muted);
        }
        .hero-search-btn {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 15px 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: 0 var(--radius-full) var(--radius-full) 0;
            transition: all var(--transition-normal);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .hero-search-btn:hover {
            background: var(--primary-dark);
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 18px;
            max-width: 500px;
        }
        .hero-tag {
            padding: 6px 13px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 500;
            background: var(--surface);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .hero-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }
        .hero-visual {
            flex: 0 0 400px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        .hero-visual-card {
            width: 100%;
            max-width: 380px;
            background: var(--surface);
            border-radius: var(--radius);
            box-shadow: var(--shadow-xl);
            padding: 28px 24px;
            position: relative;
            z-index: 2;
            border: 1px solid var(--border-light);
        }
        .hero-visual-card .stat-row {
            display: flex;
            gap: 16px;
            margin-bottom: 18px;
        }
        .hero-visual-card .stat-item {
            flex: 1;
            text-align: center;
            padding: 14px 10px;
            background: var(--bg);
            border-radius: var(--radius-sm);
        }
        .hero-visual-card .stat-num {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
        }
        .hero-visual-card .stat-label {
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: 4px;
        }
        .hero-visual-card .fake-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .hero-visual-card .fake-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 12px;
            background: var(--bg);
            border-radius: var(--radius-xs);
        }
        .hero-visual-card .fake-icon {
            width: 32px;
            height: 32px;
            border-radius: var(--radius-xs);
            flex-shrink: 0;
        }
        .hero-visual-card .fake-icon.c1 { background: #e8f2ff; }
        .hero-visual-card .fake-icon.c2 { background: #fef3c7; }
        .hero-visual-card .fake-icon.c3 { background: #d1fae5; }
        .hero-visual-card .fake-bar {
            flex: 1;
            height: 8px;
            border-radius: 4px;
            background: var(--border);
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: 60px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-label {
            display: inline-block;
            padding: 5px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            background: var(--primary-light);
            color: var(--primary);
            margin-bottom: 10px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 500px;
            margin: 0 auto;
        }

        /* ========== CATEGORY CARDS ========== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .category-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 28px 22px 22px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-xs);
            transition: all var(--transition-normal);
            display: flex;
            flex-direction: column;
            gap: 12px;
            position: relative;
            overflow: hidden;
        }
        .category-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--primary);
            opacity: 0;
            transition: opacity var(--transition-normal);
            border-radius: 0 0 3px 3px;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--border);
        }
        .category-card:hover::after {
            opacity: 1;
        }
        .category-card .cat-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            flex-shrink: 0;
        }
        .cat-icon.win { background: #e8f2ff; color: #1a6df5; }
        .cat-icon.mac { background: #f0f0f5; color: #555; }
        .cat-icon.android { background: #ecfdf5; color: #10b981; }
        .cat-icon.tools { background: #fff7ed; color: #f97316; }
        .category-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
        }
        .category-card p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }
        .category-card .cat-link {
            font-weight: 600;
            font-size: 0.875rem;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            margin-top: auto;
        }
        .category-card .cat-link i {
            transition: transform var(--transition-fast);
            font-size: 0.75rem;
        }
        .category-card:hover .cat-link i {
            transform: translateX(3px);
        }

        /* ========== CMS LIST SECTION ========== */
        .cms-list-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .cms-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 22px 20px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-xs);
            transition: all var(--transition-normal);
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .cms-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--border);
            transform: translateY(-2px);
        }
        .cms-card .cms-cat-tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
            width: fit-content;
        }
        .cms-card h4 {
            font-size: 1rem;
            font-weight: 700;
            line-height: 1.4;
        }
        .cms-card h4 a {
            color: var(--text);
        }
        .cms-card h4 a:hover {
            color: var(--primary);
        }
        .cms-card .cms-excerpt {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .cms-card .cms-meta {
            font-size: 0.78rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: auto;
        }
        .cms-empty {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            grid-column: 1 / -1;
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }

        /* ========== HOT SOFTWARE ========== */
        .hot-software-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .software-card {
            background: var(--surface);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-xs);
            transition: all var(--transition-normal);
            display: flex;
            flex-direction: column;
        }
        .software-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }
        .software-card .sw-header {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 20px 20px 14px;
        }
        .software-card .sw-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            flex-shrink: 0;
            font-weight: 700;
        }
        .sw-icon.blue { background: #e8f2ff; color: #1a6df5; }
        .sw-icon.green { background: #ecfdf5; color: #10b981; }
        .sw-icon.orange { background: #fff7ed; color: #f97316; }
        .sw-icon.purple { background: #f3e8ff; color: #7c3aed; }
        .sw-icon.teal { background: #e6fffa; color: #0d9488; }
        .sw-icon.pink { background: #fce7f3; color: #db2777; }
        .software-card .sw-info h4 {
            font-size: 1rem;
            font-weight: 700;
        }
        .software-card .sw-info .sw-ver {
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        .software-card .sw-body {
            padding: 0 20px 14px;
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }
        .software-card .sw-footer {
            padding: 14px 20px;
            border-top: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: auto;
        }
        .software-card .sw-stars {
            color: #f59e0b;
            font-size: 0.82rem;
        }
        .software-card .sw-dl-btn {
            padding: 7px 16px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 600;
            background: var(--primary);
            color: #fff;
            transition: all var(--transition-fast);
        }
        .software-card .sw-dl-btn:hover {
            background: var(--primary-dark);
            box-shadow: 0 3px 12px var(--primary-glow);
        }

        /* ========== STATS ========== */
        .stats-section {
            background: linear-gradient(160deg, #1a1d28 0%, #1e2435 40%, #1a1d28 100%);
            color: #fff;
            padding: 50px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-card {
            padding: 24px 16px;
            border-radius: var(--radius);
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.08);
            transition: all var(--transition-normal);
        }
        .stat-card:hover {
            background: rgba(255,255,255,0.08);
            border-color: rgba(255,255,255,0.16);
        }
        .stat-card .stat-big {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            line-height: 1;
            margin-bottom: 6px;
        }
        .stat-card .stat-big .accent {
            color: #60a5fa;
        }
        .stat-card .stat-desc {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.65);
        }

        /* ========== STEPS ========== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .step-card {
            text-align: center;
            padding: 28px 18px 22px;
            position: relative;
        }
        .step-card .step-num {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 14px;
            box-shadow: 0 6px 20px var(--primary-glow);
        }
        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-card p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-xs);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--text);
            text-align: left;
            transition: all var(--transition-fast);
            gap: 12px;
        }
        .faq-question:hover {
            color: var(--primary);
            background: var(--bg);
        }
        .faq-question i {
            transition: transform var(--transition-normal);
            color: var(--text-muted);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-normal);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 22px 20px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(145deg, var(--primary) 0%, #1a5fda 100%);
            color: #fff;
            padding: 50px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 240px;
            height: 240px;
            border-radius: 50%;
            background: rgba(255,255,255,0.07);
            pointer-events: none;
        }
        .cta-section .cta-title {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 10px;
            position: relative;
            z-index: 1;
        }
        .cta-section .cta-sub {
            font-size: 1rem;
            color: rgba(255,255,255,0.8);
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
        }
        .cta-btn-lg {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-weight: 700;
            font-size: 1rem;
            background: #fff;
            color: var(--primary);
            transition: all var(--transition-normal);
            position: relative;
            z-index: 1;
            box-shadow: var(--shadow-lg);
        }
        .cta-btn-lg:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-xl);
            color: var(--primary-dark);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #1a1d28;
            color: rgba(255,255,255,0.7);
            padding: 44px 0 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        .footer-brand .footer-logo {
            font-weight: 700;
            font-size: 1.15rem;
            color: #fff;
            margin-bottom: 8px;
            display: inline-block;
        }
        .footer-brand p {
            font-size: 0.85rem;
            line-height: 1.6;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .footer-col ul li a {
            font-size: 0.84rem;
            color: rgba(255,255,255,0.6);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.45);
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .hero-inner {
                flex-direction: column;
                gap: 32px;
            }
            .hero-visual {
                flex: 0 0 auto;
                width: 100%;
                max-width: 400px;
            }
            .hero-title {
                font-size: 2.2rem;
            }
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .cms-list-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hot-software-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                flex-direction: column;
                background: #fff;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                padding: 8px 16px 16px;
                gap: 2px;
                z-index: 999;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 12px 16px;
                border-radius: var(--radius-xs);
                width: 100%;
            }
            .mobile-menu-toggle {
                display: flex;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .hero-search-wrap {
                flex-direction: column;
                border-radius: var(--radius);
                overflow: visible;
            }
            .hero-search-wrap input {
                border-radius: var(--radius) var(--radius) 0 0;
                width: 100%;
                border-bottom: 1px solid var(--border-light);
            }
            .hero-search-btn {
                border-radius: 0 0 var(--radius) var(--radius);
                width: 100%;
                justify-content: center;
            }
            .hero-visual {
                display: none;
            }
            .category-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .cms-list-grid {
                grid-template-columns: 1fr;
            }
            .hot-software-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .section {
                padding: 40px 0;
            }
            .hero-section {
                padding: 40px 0 36px;
            }
        }

        @media (max-width: 480px) {
            .category-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .hero-title {
                font-size: 1.5rem;
            }
            .container {
                padding: 0 16px;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #2563EB;
            --color-primary-hover: #1D4ED8;
            --color-primary-light: #EFF6FF;
            --color-accent: #F97316;
            --color-accent-hover: #EA580C;
            --color-accent-light: #FFF7ED;
            --color-bg: #F8FAFC;
            --color-white: #FFFFFF;
            --color-card: #FFFFFF;
            --color-text: #1E293B;
            --color-text-secondary: #475569;
            --color-text-weak: #94A3B8;
            --color-border: #E2E8F0;
            --color-border-light: #F1F5F9;
            --color-success: #10B981;
            --color-success-bg: #ECFDF5;
            --color-warning: #F59E0B;
            --color-warning-bg: #FFFBEB;
            --color-footer-bg: #0F172A;
            --color-footer-text: #CBD5E1;
            --color-footer-heading: #F1F5F9;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 9999px;
            --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.09), 0 2px 8px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.11), 0 4px 16px rgba(0, 0, 0, 0.06);
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-height: 68px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-width: 320px;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ========== HEADER & NAVIGATION ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-white);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-xs);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-primary), #3B82F6);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text);
            letter-spacing: -0.01em;
            white-space: nowrap;
        }

        .logo-text span {
            color: var(--color-primary);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }

        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-links a:hover {
            color: var(--color-primary);
            background: var(--color-primary-light);
        }

        .nav-links a.active {
            color: var(--color-primary);
            background: var(--color-primary-light);
            font-weight: 600;
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 28px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 3px 3px 0 0;
        }

        .nav-cta-btn {
            background: var(--color-accent) !important;
            color: #fff !important;
            font-weight: 600 !important;
            padding: 9px 20px !important;
            border-radius: var(--radius-full) !important;
            margin-left: 6px;
            transition: all var(--transition-base) !important;
            box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
        }
        .nav-cta-btn:hover {
            background: var(--color-accent-hover) !important;
            color: #fff !important;
            box-shadow: 0 4px 16px rgba(249, 115, 22, 0.4);
            transform: translateY(-1px);
        }
        .nav-cta-btn.active {
            background: var(--color-accent-hover) !important;
            color: #fff !important;
        }
        .nav-cta-btn.active::after {
            display: none;
        }

        .mobile-menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            z-index: 1001;
            background: transparent;
            border-radius: var(--radius-sm);
        }
        .mobile-menu-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--color-text);
            border-radius: 3px;
            transition: all var(--transition-base);
            transform-origin: center;
        }
        .mobile-menu-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-menu-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 920px) {
            .mobile-menu-toggle {
                display: flex;
            }
            .nav-links {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                bottom: 0;
                background: var(--color-white);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                padding: 20px 24px;
                transform: translateX(100%);
                transition: transform var(--transition-slow);
                overflow-y: auto;
                z-index: 999;
                box-shadow: var(--shadow-xl);
            }
            .nav-links.open {
                transform: translateX(0);
            }
            .nav-links a {
                padding: 14px 16px;
                font-size: 1.05rem;
                border-radius: var(--radius-md);
                border-bottom: 1px solid var(--color-border-light);
            }
            .nav-links a.active::after {
                display: none;
            }
            .nav-links a.active {
                border-left: 3px solid var(--color-primary);
            }
            .nav-cta-btn {
                margin-left: 0;
                margin-top: 8px;
                text-align: center;
                justify-content: center;
                border-radius: var(--radius-md) !important;
                padding: 14px 20px !important;
                font-size: 1.05rem !important;
            }
        }

        @media (max-width: 520px) {
            .logo-text {
                font-size: 1.05rem;
            }
            .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 17px;
            }
            .site-header {
                --header-height: 58px;
            }
        }

        /* ========== HERO ========== */
        .hero-section {
            background: linear-gradient(170deg, #EFF6FF 0%, #F8FAFC 40%, #FFFFFF 100%);
            padding: 60px 0 50px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -120px;
            width: 350px;
            height: 350px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -100px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(249, 115, 22, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-weight: 600;
            font-size: 0.88rem;
            padding: 6px 16px;
            border-radius: var(--radius-full);
            margin-bottom: 20px;
            position: relative;
            z-index: 1;
        }
        .hero-badge i {
            font-size: 0.8rem;
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--color-text);
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
            letter-spacing: -0.02em;
        }
        .hero-title .highlight {
            color: var(--color-primary);
            position: relative;
        }
        .hero-title .highlight::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 0;
            right: 0;
            height: 10px;
            background: rgba(37, 99, 235, 0.12);
            border-radius: 4px;
            z-index: -1;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--color-text-secondary);
            max-width: 620px;
            margin: 0 auto 28px;
            position: relative;
            z-index: 1;
            line-height: 1.6;
        }

        .hero-search-wrap {
            display: flex;
            max-width: 520px;
            margin: 0 auto 24px;
            position: relative;
            z-index: 1;
            box-shadow: var(--shadow-lg);
            border-radius: var(--radius-full);
            overflow: hidden;
        }
        .hero-search-wrap input {
            flex: 1;
            padding: 14px 20px;
            font-size: 1rem;
            background: var(--color-white);
            color: var(--color-text);
            border: 2px solid var(--color-border);
            border-right: none;
            border-radius: var(--radius-full) 0 0 var(--radius-full);
            transition: border-color var(--transition-fast);
        }
        .hero-search-wrap input:focus {
            border-color: var(--color-primary);
        }
        .hero-search-wrap button {
            padding: 14px 24px;
            background: var(--color-primary);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            border-radius: 0 var(--radius-full) var(--radius-full) 0;
            transition: background var(--transition-fast);
            white-space: nowrap;
        }
        .hero-search-wrap button:hover {
            background: var(--color-primary-hover);
        }

        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            position: relative;
            z-index: 1;
        }
        .hero-tags span {
            font-size: 0.85rem;
            color: var(--color-text-weak);
        }
        .hero-tags a {
            display: inline-block;
            padding: 5px 14px;
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .hero-tags a:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: var(--color-primary-light);
            box-shadow: var(--shadow-sm);
        }

        @media (max-width: 768px) {
            .hero-section {
                padding: 40px 0 36px;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-search-wrap {
                max-width: 100%;
                flex-direction: column;
                border-radius: var(--radius-md);
                box-shadow: var(--shadow-md);
            }
            .hero-search-wrap input {
                border-radius: var(--radius-md) var(--radius-md) 0 0;
                border-right: 2px solid var(--color-border);
                border-bottom: none;
            }
            .hero-search-wrap button {
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                text-align: center;
            }
            .hero-tags a {
                font-size: 0.8rem;
                padding: 4px 10px;
            }
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: 56px 0;
        }
        .section-alt {
            background: var(--color-white);
            border-top: 1px solid var(--color-border-light);
            border-bottom: 1px solid var(--color-border-light);
        }
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-label {
            display: inline-block;
            font-size: 0.82rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--color-primary);
            background: var(--color-primary-light);
            padding: 4px 14px;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-text);
            letter-spacing: -0.01em;
            margin-bottom: 8px;
        }
        .section-desc {
            font-size: 1rem;
            color: var(--color-text-secondary);
            max-width: 560px;
            margin: 0 auto;
        }

        @media (max-width: 768px) {
            .section {
                padding: 40px 0;
            }
            .section-title {
                font-size: 1.55rem;
            }
            .section-header {
                margin-bottom: 28px;
            }
        }

        /* ========== CATEGORY GRID CARDS ========== */
        .cat-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
        }
        .cat-card {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 22px 16px 18px;
            text-align: center;
            transition: all var(--transition-base);
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }
        .cat-card:hover {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .cat-card-icon {
            width: 52px;
            height: 52px;
            margin: 0 auto 12px;
            background: var(--color-primary-light);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--color-primary);
            transition: all var(--transition-base);
        }
        .cat-card:hover .cat-card-icon {
            background: var(--color-primary);
            color: #fff;
            transform: scale(1.08);
        }
        .cat-card h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 4px;
        }
        .cat-card .cat-count {
            font-size: 0.78rem;
            color: var(--color-text-weak);
        }

        @media (max-width: 1024px) {
            .cat-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 12px;
            }
        }
        @media (max-width: 640px) {
            .cat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .cat-card {
                padding: 16px 10px 14px;
            }
            .cat-card-icon {
                width: 42px;
                height: 42px;
                font-size: 1.2rem;
            }
            .cat-card h4 {
                font-size: 0.85rem;
            }
        }

        /* ========== SOFTWARE CARDS ========== */
        .software-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .software-card {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 20px;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: 10px;
            position: relative;
        }
        .software-card:hover {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }
        .software-card .sw-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            flex-shrink: 0;
        }
        .sw-icon.blue {
            background: #EFF6FF;
            color: #2563EB;
        }
        .sw-icon.green {
            background: #ECFDF5;
            color: #10B981;
        }
        .sw-icon.orange {
            background: #FFF7ED;
            color: #F97316;
        }
        .sw-icon.purple {
            background: #F5F3FF;
            color: #7C3AED;
        }
        .sw-icon.teal {
            background: #F0FDFA;
            color: #14B8A6;
        }
        .sw-icon.red {
            background: #FEF2F2;
            color: #EF4444;
        }
        .sw-icon.indigo {
            background: #EEF2FF;
            color: #6366F1;
        }
        .sw-icon.amber {
            background: #FFFBEB;
            color: #F59E0B;
        }
        .software-card h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.3;
        }
        .software-card .sw-desc {
            font-size: 0.82rem;
            color: var(--color-text-secondary);
            line-height: 1.4;
            flex: 1;
        }
        .software-card .sw-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
            font-size: 0.78rem;
            color: var(--color-text-weak);
        }
        .software-card .sw-dl-btn {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 7px 16px;
            background: var(--color-primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.82rem;
            border-radius: var(--radius-full);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .software-card .sw-dl-btn:hover {
            background: var(--color-primary-hover);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
        }
        .software-card .sw-badge {
            position: absolute;
            top: 12px;
            right: 12px;
            font-size: 0.7rem;
            font-weight: 700;
            padding: 3px 10px;
            border-radius: var(--radius-full);
            background: var(--color-accent);
            color: #fff;
            letter-spacing: 0.03em;
        }

        @media (max-width: 1024px) {
            .software-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
        }
        @media (max-width: 540px) {
            .software-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .software-card {
                flex-direction: row;
                flex-wrap: wrap;
                align-items: center;
                gap: 8px;
                padding: 14px 16px;
            }
            .software-card .sw-icon {
                width: 40px;
                height: 40px;
                font-size: 1.1rem;
            }
            .software-card h4 {
                flex: 1;
                min-width: 120px;
            }
            .software-card .sw-desc {
                width: 100%;
                order: 3;
            }
            .software-card .sw-meta {
                width: 100%;
                order: 4;
            }
        }

        /* ========== FEATURES / SELLING POINTS ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-item {
            text-align: center;
            padding: 28px 18px;
            background: var(--color-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-base);
        }
        .feature-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--color-border);
            transform: translateY(-2px);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 14px;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
        }
        .fi-blue {
            background: #EFF6FF;
            color: #2563EB;
        }
        .fi-green {
            background: #ECFDF5;
            color: #10B981;
        }
        .fi-orange {
            background: #FFF7ED;
            color: #F97316;
        }
        .fi-purple {
            background: #F5F3FF;
            color: #7C3AED;
        }
        .feature-item h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 6px;
        }
        .feature-item p {
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            line-height: 1.5;
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
        }

        /* ========== STEPS / PROCESS ========== */
        .steps-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .step-card {
            text-align: center;
            padding: 24px 16px;
            background: var(--color-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            position: relative;
            transition: all var(--transition-base);
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--color-primary);
            transform: translateY(-2px);
        }
        .step-num {
            width: 44px;
            height: 44px;
            margin: 0 auto 12px;
            background: var(--color-primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            letter-spacing: 0;
        }
        .step-card h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 4px;
        }
        .step-card p {
            font-size: 0.82rem;
            color: var(--color-text-secondary);
            line-height: 1.4;
        }

        @media (max-width: 900px) {
            .steps-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
        }
        @media (max-width: 500px) {
            .steps-row {
                grid-template-columns: 1fr;
                gap: 10px;
            }
        }

        /* ========== STATS BAR ========== */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
            padding: 36px 0;
        }
        .stat-item .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            line-height: 1.1;
        }
        .stat-item .stat-label {
            font-size: 0.88rem;
            color: var(--color-text-secondary);
            margin-top: 4px;
        }

        @media (max-width: 768px) {
            .stats-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
                padding: 24px 0;
            }
            .stat-item .stat-number {
                font-size: 1.8rem;
            }
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 20px;
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--color-text);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            cursor: pointer;
            transition: color var(--transition-fast);
            background: transparent;
        }
        .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-question i {
            font-size: 0.85rem;
            color: var(--color-text-weak);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            padding: 0 20px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }
        .faq-answer p {
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            line-height: 1.65;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(135deg, #1E40AF 0%, #2563EB 40%, #3B82F6 100%);
            color: #fff;
            text-align: center;
            padding: 56px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50px;
            right: -80px;
            width: 260px;
            height: 260px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section .cta-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-section .cta-desc {
            font-size: 1.05rem;
            opacity: 0.9;
            margin-bottom: 28px;
            position: relative;
            z-index: 1;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-btn-lg {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: #fff;
            color: var(--color-primary);
            font-weight: 700;
            font-size: 1.05rem;
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            position: relative;
            z-index: 1;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
        }
        .cta-btn-lg:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0, 0, 0, 0.28);
            background: #F8FAFC;
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 40px 0;
            }
            .cta-section .cta-title {
                font-size: 1.5rem;
            }
            .cta-btn-lg {
                padding: 12px 24px;
                font-size: 0.95rem;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 48px 0 24px;
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            display: block;
            margin-bottom: 10px;
        }
        .footer-brand p {
            color: var(--color-footer-text);
            line-height: 1.6;
            font-size: 0.85rem;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-footer-heading);
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 7px;
        }
        .footer-col ul li a {
            color: var(--color-footer-text);
            font-size: 0.85rem;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 18px;
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.5);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        /* ========== UTILITY ========== */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: article */
:root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-light: #DBEAFE;
            --primary-50: #EFF6FF;
            --accent: #F59E0B;
            --accent-dark: #D97706;
            --accent-light: #FEF3C7;
            --bg: #F8FAFC;
            --surface: #FFFFFF;
            --surface-alt: #F1F5F9;
            --text: #1E293B;
            --text-secondary: #475569;
            --text-muted: #64748B;
            --text-light: #94A3B8;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
            --shadow-lg: 0 8px 30px rgba(0,0,0,0.10), 0 4px 10px rgba(0,0,0,0.05);
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
            --max-width: 1200px;
            --nav-height: 64px;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button, input {
            font-family: inherit;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== HEADER & NAV ========== */
        .site-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-xs);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
            gap: 24px;
        }

        .logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.01em;
            white-space: nowrap;
            transition: opacity var(--transition);
        }

        .logo a:hover {
            opacity: 0.85;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary), #3B82F6);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .nav-links a {
            padding: 8px 15px;
            border-radius: var(--radius-sm);
            font-size: 0.93rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
            position: relative;
        }

        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-50);
        }

        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-50);
            font-weight: 600;
        }

        .nav-cta-btn {
            background: var(--accent) !important;
            color: #fff !important;
            font-weight: 600 !important;
            padding: 9px 18px !important;
            border-radius: var(--radius) !important;
            margin-left: 6px;
            transition: all var(--transition) !important;
            box-shadow: 0 2px 8px rgba(245,158,11,0.3);
        }

        .nav-cta-btn:hover {
            background: var(--accent-dark) !important;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(245,158,11,0.4);
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }

        .mobile-menu-toggle:hover {
            background: var(--surface-alt);
        }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-bar {
            background: var(--surface);
            border-bottom: 1px solid var(--border-light);
            padding: 12px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.875rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb .sep {
            color: var(--text-light);
            font-size: 0.7rem;
        }

        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }

        /* ========== MAIN LAYOUT ========== */
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 32px;
            padding: 32px 0 48px;
        }

        .article-main {
            min-width: 0;
        }

        .article-sidebar {
            position: sticky;
            top: calc(var(--nav-height) + 24px);
            align-self: start;
        }

        /* ========== ARTICLE HEADER ========== */
        .article-header {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 32px 36px;
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }

        .article-category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-50);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 20px;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }

        .article-category-badge i {
            font-size: 0.7rem;
        }

        .article-title {
            font-size: 1.85rem;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 18px;
            flex-wrap: wrap;
            font-size: 0.875rem;
            color: var(--text-muted);
            padding-top: 4px;
        }

        .article-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .article-meta i {
            font-size: 0.85rem;
            color: var(--text-light);
        }

        /* ========== ARTICLE BODY ========== */
        .article-body-wrapper {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 36px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            margin-bottom: 24px;
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }

        .article-body h2 {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--text);
            margin: 32px 0 14px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-light);
            letter-spacing: -0.01em;
        }

        .article-body h3 {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--text);
            margin: 24px 0 10px;
        }

        .article-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-secondary);
            margin: 18px 0 8px;
        }

        .article-body p {
            margin-bottom: 16px;
        }

        .article-body ul,
        .article-body ol {
            margin: 12px 0 20px;
            padding-left: 24px;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body ul li::marker {
            color: var(--primary);
        }

        .article-body img {
            border-radius: var(--radius);
            margin: 20px 0;
            box-shadow: var(--shadow-sm);
        }

        .article-body pre {
            background: #1E293B;
            color: #E2E8F0;
            padding: 20px 24px;
            border-radius: var(--radius);
            overflow-x: auto;
            font-family: var(--font-mono);
            font-size: 0.9rem;
            line-height: 1.6;
            margin: 20px 0;
        }

        .article-body code {
            background: var(--surface-alt);
            color: var(--primary-dark);
            padding: 2px 8px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.9em;
            border: 1px solid var(--border);
        }

        .article-body pre code {
            background: none;
            color: inherit;
            padding: 0;
            border: none;
            font-size: inherit;
        }

        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-50);
            padding: 16px 20px;
            margin: 20px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.95rem;
        }

        .article-body table th,
        .article-body table td {
            padding: 10px 14px;
            border: 1px solid var(--border);
            text-align: left;
        }

        .article-body table th {
            background: var(--surface-alt);
            font-weight: 600;
            color: var(--text);
        }

        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .article-body a:hover {
            color: var(--primary-dark);
        }

        /* ========== CTA DOWNLOAD CARD ========== */
        .article-cta-card {
            background: linear-gradient(135deg, #EFF6FF 0%, #F0F9FF 100%);
            border: 2px solid var(--primary-light);
            border-radius: var(--radius-lg);
            padding: 28px 32px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-sm);
        }

        .article-cta-card .cta-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--primary), #3B82F6);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.5rem;
            flex-shrink: 0;
            box-shadow: 0 4px 14px rgba(37,99,235,0.3);
        }

        .article-cta-card .cta-info {
            flex: 1;
            min-width: 180px;
        }

        .article-cta-card .cta-info h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 4px;
        }

        .article-cta-card .cta-info p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
        }

        .article-cta-card .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: var(--radius);
            font-size: 0.95rem;
            transition: all var(--transition);
            box-shadow: 0 2px 10px rgba(245,158,11,0.35);
            white-space: nowrap;
        }

        .article-cta-card .cta-btn:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(245,158,11,0.45);
        }

        /* ========== SIDEBAR ========== */
        .sidebar-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 24px;
            margin-bottom: 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }

        .sidebar-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-card h4 i {
            color: var(--primary);
            font-size: 0.9rem;
        }

        .sidebar-software-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .sidebar-software-list li a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        .sidebar-software-list li a:hover {
            background: var(--primary-50);
            color: var(--primary);
        }

        .sidebar-software-list .rank-num {
            width: 26px;
            height: 26px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .sidebar-software-list .rank-num.top1 {
            background: #FEF3C7;
            color: #D97706;
        }
        .sidebar-software-list .rank-num.top2 {
            background: #F1F5F9;
            color: #64748B;
        }
        .sidebar-software-list .rank-num.top3 {
            background: #FDF2F8;
            color: #BE185D;
        }

        .sidebar-software-list .sw-info {
            flex: 1;
            min-width: 0;
        }

        .sidebar-software-list .sw-name {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text);
            display: block;
            line-height: 1.3;
        }

        .sidebar-software-list .sw-meta {
            font-size: 0.75rem;
            color: var(--text-muted);
            display: block;
            margin-top: 2px;
        }

        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .sidebar-tags a {
            display: inline-block;
            padding: 6px 14px;
            background: var(--surface-alt);
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--text-secondary);
            transition: all var(--transition);
            border: 1px solid transparent;
        }

        .sidebar-tags a:hover {
            background: var(--primary-50);
            color: var(--primary);
            border-color: var(--primary-light);
        }

        /* ========== RELATED POSTS ========== */
        .related-section {
            margin-bottom: 24px;
        }

        .related-section h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .related-section h3 i {
            color: var(--primary);
            font-size: 1.1rem;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .related-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .related-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }

        .related-card .rc-icon {
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .rc-icon.win { background: #EFF6FF; color: #2563EB; }
        .rc-icon.mac { background: #F0FDF4; color: #16A34A; }
        .rc-icon.android { background: #FEFCE8; color: #CA8A04; }
        .rc-icon.tool { background: #FDF2F8; color: #BE185D; }

        .related-card .rc-title {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text);
            line-height: 1.4;
        }

        .related-card .rc-desc {
            font-size: 0.8rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .related-card .rc-link {
            font-size: 0.85rem;
            color: var(--primary);
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 4px;
            margin-top: auto;
            transition: gap var(--transition);
        }

        .related-card .rc-link:hover {
            gap: 8px;
            color: var(--primary-dark);
        }

        /* ========== NOT FOUND ========== */
        .not-found-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 60px 36px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            margin-bottom: 24px;
        }

        .not-found-card .nf-icon {
            font-size: 3.5rem;
            color: var(--text-light);
            margin-bottom: 16px;
        }

        .not-found-card h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }

        .not-found-card p {
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .not-found-card .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: var(--radius);
            transition: all var(--transition);
            box-shadow: 0 2px 10px rgba(37,99,235,0.3);
        }

        .not-found-card .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37,99,235,0.4);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #1E293B;
            color: #CBD5E1;
            padding: 48px 0 24px;
            margin-top: 48px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .footer-logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: block;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 0.875rem;
            line-height: 1.7;
            color: #94A3B8;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #E2E8F0;
            margin-bottom: 14px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 0.875rem;
            color: #94A3B8;
            transition: color var(--transition);
        }

        .footer-col ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            font-size: 0.8rem;
            color: #64748B;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr 280px;
                gap: 24px;
            }

            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .article-sidebar {
                position: static;
            }

            .article-header {
                padding: 24px 20px;
            }

            .article-body-wrapper {
                padding: 24px 20px;
            }

            .article-title {
                font-size: 1.45rem;
            }

            .article-body {
                font-size: 1rem;
            }

            .article-cta-card {
                padding: 20px;
                gap: 14px;
            }

            .nav-links {
                gap: 2px;
            }

            .nav-links a {
                padding: 6px 10px;
                font-size: 0.8rem;
            }

            .nav-cta-btn {
                padding: 7px 12px !important;
                font-size: 0.8rem !important;
            }

            .related-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .header-inner {
                height: 56px;
            }

            .logo a {
                font-size: 1.05rem;
            }

            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }

            .nav-links {
                display: none;
            }

            .mobile-menu-toggle {
                display: block;
            }

            .nav-links.mobile-open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--surface);
                border-bottom: 2px solid var(--border);
                padding: 12px 16px;
                gap: 4px;
                box-shadow: var(--shadow-lg);
                z-index: 999;
            }

            .nav-links.mobile-open a {
                padding: 10px 14px;
                border-radius: var(--radius-sm);
                font-size: 0.9rem;
            }

            .article-header {
                padding: 20px 16px;
            }

            .article-body-wrapper {
                padding: 20px 16px;
            }

            .article-title {
                font-size: 1.3rem;
            }

            .article-body {
                font-size: 0.95rem;
            }

            .article-body h2 {
                font-size: 1.2rem;
            }

            .article-body h3 {
                font-size: 1.05rem;
            }

            .article-meta {
                gap: 10px;
                font-size: 0.8rem;
            }

            .article-cta-card {
                flex-direction: column;
                text-align: center;
            }

            .article-cta-card .cta-info {
                text-align: center;
            }

            .related-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }

            .sidebar-card {
                padding: 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .not-found-card {
                padding: 40px 20px;
            }

            .not-found-card .nf-icon {
                font-size: 2.5rem;
            }
        }

/* roulang page: category2 */
:root {
            --color-primary: #4F5EF7;
            --color-primary-dark: #3B49D6;
            --color-primary-light: #EEF0FF;
            --color-accent: #10B981;
            --color-accent-dark: #059669;
            --color-accent-light: #ECFDF5;
            --color-amber: #F59E0B;
            --color-amber-light: #FFFBEB;
            --color-bg: #F8FAFC;
            --color-surface: #FFFFFF;
            --color-dark: #1E293B;
            --color-text: #334155;
            --color-text-light: #64748B;
            --color-text-lighter: #94A3B8;
            --color-border: #E2E8F0;
            --color-border-light: #F1F5F9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 50px;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.10), 0 4px 16px rgba(0, 0, 0, 0.05);
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --nav-height: 68px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--color-dark);
            line-height: 1.3;
            font-weight: 700;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--color-border);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition-normal);
        }

        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--color-dark);
            white-space: nowrap;
            flex-shrink: 0;
            transition: opacity var(--transition-fast);
        }

        .logo-link:hover {
            opacity: 0.8;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--color-primary), #7B6CF6);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
        }

        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--color-text);
            white-space: nowrap;
            transition: all var(--transition-fast);
            position: relative;
        }

        .nav-links a:hover {
            color: var(--color-primary);
            background: var(--color-primary-light);
        }

        .nav-links a.active {
            color: var(--color-primary);
            background: var(--color-primary-light);
            font-weight: 600;
        }

        .nav-cta-btn {
            background: var(--color-primary) !important;
            color: #fff !important;
            font-weight: 600 !important;
            padding: 10px 20px !important;
            border-radius: var(--radius-full) !important;
            margin-left: 6px;
            transition: all var(--transition-normal) !important;
            box-shadow: 0 2px 8px rgba(79, 94, 247, 0.3);
        }

        .nav-cta-btn:hover {
            background: var(--color-primary-dark) !important;
            box-shadow: 0 6px 20px rgba(79, 94, 247, 0.4) !important;
            transform: translateY(-1px);
            color: #fff !important;
        }

        .nav-cta-btn i {
            margin-right: 5px;
            font-size: 0.8rem;
        }

        /* 移动端导航 - 横向滚动 */
        @media (max-width: 860px) {
            .header-inner {
                flex-wrap: wrap;
                gap: 8px;
                padding: 0 16px;
            }
            .site-header {
                height: auto;
                min-height: var(--nav-height);
                padding: 8px 0;
            }
            .nav-links {
                order: 3;
                width: 100%;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: none;
                gap: 2px;
                padding: 0 0 4px 0;
                justify-content: flex-start;
                flex-wrap: nowrap;
            }
            .nav-links::-webkit-scrollbar {
                display: none;
            }
            .nav-links a {
                padding: 7px 13px;
                font-size: 0.85rem;
                flex-shrink: 0;
            }
            .nav-cta-btn {
                padding: 8px 15px !important;
                font-size: 0.85rem !important;
                flex-shrink: 0;
            }
        }

        @media (max-width: 520px) {
            .logo-link {
                font-size: 1.05rem;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.9rem;
            }
            .nav-links a {
                padding: 6px 10px;
                font-size: 0.8rem;
            }
            .nav-cta-btn {
                padding: 7px 12px !important;
                font-size: 0.8rem !important;
            }
        }

        /* ========== HERO ========== */
        .hero-section {
            background: linear-gradient(170deg, #EEF2FF 0%, #F8FAFC 30%, #ECFDF5 100%);
            padding: 64px 0 56px;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 360px;
            height: 360px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(79, 94, 247, 0.07) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 240px;
            height: 240px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(16, 185, 129, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-full);
            padding: 6px 16px;
            font-size: 0.85rem;
            color: var(--color-primary);
            font-weight: 500;
            margin-bottom: 20px;
            box-shadow: var(--shadow-sm);
        }

        .hero-badge i {
            font-size: 0.75rem;
            color: var(--color-accent);
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--color-dark);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }

        .hero-title .highlight {
            background: linear-gradient(135deg, var(--color-primary), #7B6CF6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--color-text-light);
            margin-bottom: 32px;
            max-width: 580px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }

        .hero-search-wrap {
            display: flex;
            max-width: 520px;
            margin: 0 auto 24px;
            background: var(--color-surface);
            border-radius: var(--radius-full);
            box-shadow: var(--shadow-lg);
            overflow: hidden;
            border: 2px solid transparent;
            transition: all var(--transition-normal);
        }

        .hero-search-wrap:focus-within {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-xl), 0 0 0 8px rgba(79, 94, 247, 0.06);
        }

        .hero-search-input {
            flex: 1;
            border: none;
            outline: none;
            padding: 16px 22px;
            font-size: 1rem;
            color: var(--color-text);
            background: transparent;
            min-width: 0;
        }

        .hero-search-input::placeholder {
            color: var(--color-text-lighter);
        }

        .hero-search-btn {
            background: var(--color-primary);
            color: #fff;
            font-weight: 600;
            padding: 16px 28px;
            font-size: 1rem;
            border-radius: 0 var(--radius-full) var(--radius-full) 0;
            white-space: nowrap;
            transition: all var(--transition-normal);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .hero-search-btn:hover {
            background: var(--color-primary-dark);
        }

        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 7px 14px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 500;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            color: var(--color-text);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .hero-tag:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: var(--color-primary-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 36px;
            flex-wrap: wrap;
        }

        .hero-stat {
            text-align: center;
        }

        .hero-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--color-dark);
            line-height: 1;
        }

        .hero-stat-number .accent {
            color: var(--color-accent);
        }

        .hero-stat-label {
            font-size: 0.85rem;
            color: var(--color-text-light);
            margin-top: 4px;
        }

        @media (max-width: 768px) {
            .hero-section {
                padding: 40px 0 40px;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-search-wrap {
                max-width: 100%;
            }
            .hero-search-btn {
                padding: 14px 18px;
                font-size: 0.9rem;
            }
            .hero-search-input {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .hero-stats {
                gap: 20px;
            }
            .hero-stat-number {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.6rem;
            }
            .hero-subtitle {
                font-size: 0.9rem;
            }
            .hero-search-btn {
                padding: 12px 14px;
                font-size: 0.8rem;
            }
            .hero-search-input {
                padding: 12px 12px;
                font-size: 0.85rem;
            }
            .hero-tag {
                padding: 5px 10px;
                font-size: 0.78rem;
            }
            .hero-stats {
                gap: 16px;
            }
            .hero-stat-number {
                font-size: 1.3rem;
            }
            .hero-stat-label {
                font-size: 0.75rem;
            }
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: 64px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 44px;
        }

        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-primary);
            background: var(--color-primary-light);
            padding: 5px 14px;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            color: var(--color-dark);
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--color-text-light);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .section {
                padding: 44px 0;
            }
            .section-title {
                font-size: 1.55rem;
            }
            .section-desc {
                font-size: 0.9rem;
            }
            .section-header {
                margin-bottom: 30px;
            }
        }

        @media (max-width: 520px) {
            .section {
                padding: 32px 0;
            }
            .section-title {
                font-size: 1.3rem;
            }
        }

        /* ========== ADVANTAGE CARDS ========== */
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .advantage-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            text-align: center;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-slow);
            position: relative;
            overflow: hidden;
        }

        .advantage-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
            opacity: 0;
            transition: opacity var(--transition-normal);
        }

        .advantage-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-xl);
            border-color: transparent;
        }

        .advantage-card:hover::before {
            opacity: 1;
        }

        .advantage-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 1.5rem;
            transition: transform var(--transition-normal);
        }

        .advantage-card:hover .advantage-icon {
            transform: scale(1.08);
        }

        .advantage-icon.blue {
            background: #EEF2FF;
            color: #4F5EF7;
        }
        .advantage-icon.green {
            background: #ECFDF5;
            color: #10B981;
        }
        .advantage-icon.amber {
            background: #FFFBEB;
            color: #F59E0B;
        }
        .advantage-icon.purple {
            background: #F5F3FF;
            color: #8B5CF6;
        }

        .advantage-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--color-dark);
        }

        .advantage-card p {
            font-size: 0.9rem;
            color: var(--color-text-light);
            line-height: 1.6;
        }

        @media (max-width: 1024px) {
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }

        @media (max-width: 520px) {
            .advantages-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .advantage-card {
                padding: 20px 18px;
            }
            .advantage-card h3 {
                font-size: 1rem;
            }
        }

        /* ========== CATEGORY CARDS ========== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .category-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 28px 22px;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-slow);
            display: flex;
            align-items: flex-start;
            gap: 16px;
            cursor: pointer;
            position: relative;
            text-decoration: none;
            color: inherit;
        }

        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
            border-color: var(--color-primary);
        }

        .category-card-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            flex-shrink: 0;
            transition: transform var(--transition-normal);
        }

        .category-card:hover .category-card-icon {
            transform: scale(1.1);
        }

        .category-card-icon.cat1 {
            background: #EEF2FF;
            color: #4F5EF7;
        }
        .category-card-icon.cat2 {
            background: #ECFDF5;
            color: #10B981;
        }
        .category-card-icon.cat3 {
            background: #FFF7ED;
            color: #F97316;
        }
        .category-card-icon.cat4 {
            background: #FDF2F8;
            color: #EC4899;
        }
        .category-card-icon.cat5 {
            background: #F0F9FF;
            color: #0EA5E9;
        }
        .category-card-icon.cat6 {
            background: #F5F3FF;
            color: #8B5CF6;
        }

        .category-card-info h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 4px;
            color: var(--color-dark);
        }

        .category-card-info .count {
            font-size: 0.8rem;
            color: var(--color-text-lighter);
        }

        .category-card-info p {
            font-size: 0.85rem;
            color: var(--color-text-light);
            margin-top: 4px;
            line-height: 1.5;
        }

        .category-card-arrow {
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--color-text-lighter);
            font-size: 0.9rem;
            transition: all var(--transition-normal);
            opacity: 0;
        }

        .category-card:hover .category-card-arrow {
            opacity: 1;
            right: 14px;
            color: var(--color-primary);
        }

        @media (max-width: 1024px) {
            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
        }

        @media (max-width: 520px) {
            .categories-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            .category-card {
                padding: 20px 16px;
                gap: 12px;
            }
            .category-card-icon {
                width: 42px;
                height: 42px;
                font-size: 1.1rem;
            }
            .category-card-info h4 {
                font-size: 0.95rem;
            }
        }

        /* ========== SOFTWARE CARDS ========== */
        .software-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .software-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-slow);
            cursor: pointer;
            display: flex;
            flex-direction: column;
        }

        .software-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-xl);
            border-color: transparent;
        }

        .software-card-img {
            height: 140px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 3.5rem;
            position: relative;
            overflow: hidden;
        }

        .software-card-img.si1 {
            background: linear-gradient(135deg, #EEF2FF, #E0E7FF);
        }
        .software-card-img.si2 {
            background: linear-gradient(135deg, #ECFDF5, #D1FAE5);
        }
        .software-card-img.si3 {
            background: linear-gradient(135deg, #FFF7ED, #FFEDD5);
        }
        .software-card-img.si4 {
            background: linear-gradient(135deg, #FDF2F8, #FCE7F3);
        }
        .software-card-img.si5 {
            background: linear-gradient(135deg, #F0F9FF, #E0F2FE);
        }
        .software-card-img.si6 {
            background: linear-gradient(135deg, #F5F3FF, #EDE9FE);
        }
        .software-card-img.si7 {
            background: linear-gradient(135deg, #FEFCE8, #FEF9C3);
        }
        .software-card-img.si8 {
            background: linear-gradient(135deg, #F1F5F9, #E2E8F0);
        }

        .software-card-badge {
            position: absolute;
            top: 10px;
            left: 10px;
            background: var(--color-accent);
            color: #fff;
            font-size: 0.7rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: var(--radius-full);
            letter-spacing: 0.03em;
        }

        .software-card-body {
            padding: 16px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .software-card-body h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 4px;
            color: var(--color-dark);
        }

        .software-card-body .meta {
            font-size: 0.78rem;
            color: var(--color-text-lighter);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .software-card-body .meta .stars {
            color: var(--color-amber);
        }

        .software-card-body .desc {
            font-size: 0.8rem;
            color: var(--color-text-light);
            line-height: 1.5;
            flex: 1;
            margin-bottom: 10px;
        }

        .software-card-tag-row {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .software-tag {
            font-size: 0.7rem;
            padding: 3px 10px;
            border-radius: var(--radius-full);
            background: var(--color-bg);
            color: var(--color-text-light);
            font-weight: 500;
            white-space: nowrap;
        }

        @media (max-width: 1024px) {
            .software-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
        }

        @media (max-width: 520px) {
            .software-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .software-card-img {
                height: 100px;
                font-size: 2.5rem;
            }
            .software-card-body {
                padding: 12px;
            }
            .software-card-body h4 {
                font-size: 0.85rem;
            }
            .software-card-body .desc {
                font-size: 0.72rem;
            }
        }

        @media (max-width: 380px) {
            .software-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== STEPS / PROCESS ========== */
        .steps-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            counter-reset: step;
        }

        .step-item {
            text-align: center;
            position: relative;
            padding: 32px 24px 24px;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-slow);
            counter-increment: step;
        }

        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .step-number {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            font-size: 1.3rem;
            font-weight: 800;
            margin: 0 auto 18px;
            position: relative;
            z-index: 1;
            transition: transform var(--transition-normal);
        }

        .step-item:hover .step-number {
            transform: scale(1.1);
            box-shadow: 0 8px 24px rgba(79, 94, 247, 0.35);
        }

        .step-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--color-dark);
        }

        .step-item p {
            font-size: 0.9rem;
            color: var(--color-text-light);
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .steps-list {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 16px;
            }
            .step-item {
                padding: 20px 14px 16px;
            }
            .step-item h4 {
                font-size: 0.95rem;
            }
            .step-item p {
                font-size: 0.8rem;
            }
            .step-number {
                width: 42px;
                height: 42px;
                font-size: 1.1rem;
            }
        }

        @media (max-width: 520px) {
            .steps-list {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .step-item {
                display: flex;
                align-items: center;
                gap: 16px;
                text-align: left;
                padding: 18px 16px;
            }
            .step-number {
                margin: 0;
                flex-shrink: 0;
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border-light);
            overflow: hidden;
            transition: all var(--transition-normal);
        }

        .faq-item:hover {
            border-color: var(--color-border);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 20px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--color-dark);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            cursor: pointer;
            transition: color var(--transition-fast);
            background: none;
            border: none;
            font-family: inherit;
        }

        .faq-question:hover {
            color: var(--color-primary);
        }

        .faq-question i {
            font-size: 0.9rem;
            color: var(--color-text-lighter);
            transition: transform var(--transition-normal);
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-normal);
            padding: 0 20px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        .faq-answer p {
            font-size: 0.9rem;
            color: var(--color-text-light);
            line-height: 1.7;
        }

        @media (max-width: 520px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-answer p {
                font-size: 0.82rem;
            }
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(160deg, #1E293B 0%, #1A2240 50%, #1E293B 100%);
            padding: 60px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -120px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(79, 94, 247, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-inner {
            position: relative;
            z-index: 1;
            max-width: 650px;
            margin: 0 auto;
        }

        .cta-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }

        .cta-desc {
            font-size: 1.05rem;
            color: #CBD5E1;
            margin-bottom: 28px;
            line-height: 1.7;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-accent);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            padding: 16px 36px;
            border-radius: var(--radius-full);
            transition: all var(--transition-slow);
            box-shadow: 0 8px 28px rgba(16, 185, 129, 0.35);
            letter-spacing: 0.01em;
        }

        .cta-btn:hover {
            background: var(--color-accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 14px 36px rgba(16, 185, 129, 0.45);
        }

        .cta-btn i {
            font-size: 1rem;
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 44px 0;
            }
            .cta-title {
                font-size: 1.6rem;
            }
            .cta-desc {
                font-size: 0.9rem;
            }
            .cta-btn {
                font-size: 1rem;
                padding: 14px 28px;
            }
        }

        @media (max-width: 520px) {
            .cta-title {
                font-size: 1.3rem;
            }
            .cta-btn {
                font-size: 0.9rem;
                padding: 12px 22px;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #0F172A;
            color: #CBD5E1;
            padding: 48px 0 28px;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand .footer-logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: block;
            margin-bottom: 10px;
        }

        .footer-brand p {
            color: #94A3B8;
            line-height: 1.7;
            font-size: 0.85rem;
            max-width: 280px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

        .footer-col ul li a {
            color: #94A3B8;
            font-size: 0.85rem;
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 20px;
            text-align: center;
            color: #64748B;
            font-size: 0.8rem;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .footer-brand {
                grid-column: 1;
            }
            .site-footer {
                padding: 32px 0 20px;
            }
        }

        /* ========== SCROLL TO TOP ========== */
        .scroll-top-btn {
            position: fixed;
            bottom: 28px;
            right: 28px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            opacity: 0;
            pointer-events: none;
            transition: all var(--transition-normal);
            z-index: 900;
            cursor: pointer;
            border: none;
        }

        .scroll-top-btn.visible {
            opacity: 1;
            pointer-events: auto;
        }

        .scroll-top-btn:hover {
            background: var(--color-primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-xl);
        }

        /* ========== UTILITY ========== */
        .bg-white {
            background: var(--color-surface);
        }

        .bg-light {
            background: var(--color-bg);
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

/* roulang page: category3 */
:root {
            --color-brand: #4f46e5;
            --color-brand-dark: #4338ca;
            --color-brand-light: #818cf8;
            --color-accent: #10b981;
            --color-accent-dark: #059669;
            --color-warm: #f59e0b;
            --color-surface: #f8fafc;
            --color-card: #ffffff;
            --color-muted: #94a3b8;
            --color-deep: #1e293b;
            --color-soft: #e2e8f0;
            --color-danger: #ef4444;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 10px 25px rgba(0, 0, 0, 0.10), 0 4px 10px rgba(0, 0, 0, 0.05);
            --shadow-nav: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
            --shadow-btn: 0 2px 8px rgba(79, 70, 229, 0.25);
            --transition-fast: 0.18s ease;
            --transition-smooth: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-deep);
            background-color: var(--color-surface);
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-brand-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* ========== HEADER & NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--color-soft);
            box-shadow: var(--shadow-nav);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-brand);
            letter-spacing: -0.01em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            flex-shrink: 0;
        }

        .logo i {
            font-size: 1.5rem;
            color: var(--color-accent);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 0.45rem 0.85rem;
            border-radius: var(--radius-md);
            font-size: 0.925rem;
            font-weight: 500;
            color: #475569;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-links a:hover {
            color: var(--color-brand);
            background: #eef2ff;
        }

        .nav-links a.active {
            color: var(--color-brand);
            font-weight: 600;
            background: #eef2ff;
        }

        .nav-cta-btn {
            background: var(--color-accent) !important;
            color: #fff !important;
            padding: 0.5rem 1.15rem !important;
            border-radius: 2rem !important;
            font-weight: 600 !important;
            box-shadow: var(--shadow-btn);
            transition: all var(--transition-smooth) !important;
            margin-left: 0.5rem;
        }

        .nav-cta-btn:hover {
            background: var(--color-accent-dark) !important;
            color: #fff !important;
            box-shadow: 0 4px 16px rgba(16, 185, 129, 0.35) !important;
            transform: translateY(-1px);
        }

        .nav-cta-btn i {
            margin-right: 0.35rem;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--color-deep);
            padding: 0.4rem;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-toggle:hover {
            background: #f1f5f9;
        }

        @media (max-width: 860px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                flex-direction: column;
                background: #fff;
                border-bottom: 1px solid var(--color-soft);
                box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
                padding: 0.75rem 1.25rem;
                gap: 0.15rem;
                z-index: 99;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-links a {
                width: 100%;
                padding: 0.7rem 1rem;
                border-radius: var(--radius-sm);
                font-size: 0.95rem;
            }

            .nav-cta-btn {
                margin-left: 0;
                text-align: center;
                justify-content: center;
                margin-top: 0.3rem;
            }

            .mobile-toggle {
                display: block;
            }
        }

        @media (max-width: 520px) {
            .header-inner {
                height: 56px;
            }

            .logo {
                font-size: 1.1rem;
            }

            .logo i {
                font-size: 1.25rem;
            }

            .nav-links {
                top: 56px;
            }
        }

        /* ========== HERO ========== */
        .hero-section {
            background: linear-gradient(160deg, #eef2ff 0%, #f8fafc 35%, #ecfdf5 100%);
            padding: 3.5rem 0 4rem;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -120px;
            width: 380px;
            height: 380px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.07) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -80px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(16, 185, 129, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .hero-text h1 {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.25;
            color: #1e293b;
            margin: 0 0 1rem;
            letter-spacing: -0.02em;
        }

        .hero-text h1 .highlight {
            color: var(--color-brand);
            position: relative;
        }

        .hero-text h1 .highlight::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 0;
            right: 0;
            height: 8px;
            background: rgba(99, 102, 241, 0.15);
            border-radius: 4px;
            z-index: -1;
        }

        .hero-text .subtitle {
            font-size: 1.1rem;
            color: #64748b;
            margin: 0 0 1.75rem;
            line-height: 1.7;
            max-width: 480px;
        }

        .hero-stats-row {
            display: flex;
            gap: 2rem;
            margin-bottom: 1.75rem;
            flex-wrap: wrap;
        }

        .hero-stat {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 0.95rem;
            color: #475569;
            font-weight: 500;
        }

        .hero-stat i {
            font-size: 1.3rem;
            color: var(--color-accent);
        }

        .hero-stat strong {
            color: var(--color-brand);
            font-weight: 700;
            font-size: 1.15rem;
        }

        .hero-buttons {
            display: flex;
            gap: 0.85rem;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.6rem;
            border-radius: 2.5rem;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            border: none;
            transition: all var(--transition-smooth);
            white-space: nowrap;
            text-decoration: none;
        }

        .btn-primary {
            background: var(--color-brand);
            color: #fff;
            box-shadow: var(--shadow-btn);
        }

        .btn-primary:hover {
            background: var(--color-brand-dark);
            box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: #fff;
            color: var(--color-brand);
            border: 2px solid #e0e7ff;
        }

        .btn-outline:hover {
            border-color: var(--color-brand);
            background: #eef2ff;
            transform: translateY(-1px);
        }

        .btn-accent {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 2px 8px rgba(16, 185, 129, 0.25);
        }

        .btn-accent:hover {
            background: var(--color-accent-dark);
            box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
            transform: translateY(-2px);
        }

        .btn-lg {
            padding: 0.85rem 2rem;
            font-size: 1rem;
        }

        .hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-phone-mock {
            width: 240px;
            height: 460px;
            background: #1e293b;
            border-radius: 2.5rem;
            padding: 12px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
            position: relative;
        }

        .hero-phone-screen {
            width: 100%;
            height: 100%;
            background: #fff;
            border-radius: 1.75rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 1.5rem;
            text-align: center;
            gap: 0.6rem;
        }

        .hero-phone-screen i {
            font-size: 3rem;
            color: var(--color-accent);
        }

        .hero-phone-screen .app-icon-row {
            display: flex;
            gap: 0.4rem;
            flex-wrap: wrap;
            justify-content: center;
        }

        .hero-phone-screen .mini-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: #fff;
        }

        .mini-icon.c1 {
            background: #6366f1;
        }
        .mini-icon.c2 {
            background: #10b981;
        }
        .mini-icon.c3 {
            background: #f59e0b;
        }
        .mini-icon.c4 {
            background: #ef4444;
        }
        .mini-icon.c5 {
            background: #3b82f6;
        }

        @media (max-width: 860px) {
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 2rem;
                text-align: center;
            }

            .hero-text .subtitle {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }

            .hero-stats-row {
                justify-content: center;
            }

            .hero-buttons {
                justify-content: center;
            }

            .hero-text h1 {
                font-size: 1.9rem;
            }

            .hero-phone-mock {
                width: 180px;
                height: 350px;
            }

            .hero-section {
                padding: 2.5rem 0 3rem;
            }
        }

        @media (max-width: 520px) {
            .hero-text h1 {
                font-size: 1.55rem;
            }

            .hero-text .subtitle {
                font-size: 0.95rem;
            }

            .hero-stats-row {
                gap: 1rem;
            }

            .hero-stat {
                font-size: 0.85rem;
            }

            .hero-phone-mock {
                width: 150px;
                height: 290px;
                border-radius: 2rem;
            }

            .hero-phone-screen {
                border-radius: 1.35rem;
                padding: 1rem;
            }

            .hero-phone-screen i {
                font-size: 2rem;
            }

            .btn {
                padding: 0.6rem 1.3rem;
                font-size: 0.875rem;
            }
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: 3.5rem 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 2.5rem;
        }

        .section-header h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: #1e293b;
            margin: 0 0 0.6rem;
            letter-spacing: -0.01em;
        }

        .section-header .section-subtitle {
            font-size: 0.95rem;
            color: #64748b;
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .section-badge {
            display: inline-block;
            padding: 0.3rem 0.9rem;
            background: #eef2ff;
            color: var(--color-brand);
            border-radius: 2rem;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            margin-bottom: 0.75rem;
        }

        @media (max-width: 520px) {
            .section {
                padding: 2.5rem 0;
            }

            .section-header h2 {
                font-size: 1.4rem;
            }

            .section-header .section-subtitle {
                font-size: 0.875rem;
            }
        }

        /* ========== CATEGORY GRID ========== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
        }

        .category-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 1.5rem 1.25rem;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            cursor: pointer;
            border: 1px solid transparent;
            position: relative;
            overflow: hidden;
        }

        .category-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: #e0e7ff;
        }

        .category-card .cat-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 0.85rem;
            font-size: 1.5rem;
            color: #fff;
            transition: transform var(--transition-fast);
        }

        .category-card:hover .cat-icon {
            transform: scale(1.08);
        }

        .cat-icon.social {
            background: linear-gradient(135deg, #6366f1, #818cf8);
        }
        .cat-icon.tool {
            background: linear-gradient(135deg, #10b981, #34d399);
        }
        .cat-icon.media {
            background: linear-gradient(135deg, #f59e0b, #fbbf24);
        }
        .cat-icon.office {
            background: linear-gradient(135deg, #3b82f6, #60a5fa);
        }
        .cat-icon.game {
            background: linear-gradient(135deg, #ef4444, #f87171);
        }
        .cat-icon.learn {
            background: linear-gradient(135deg, #8b5cf6, #a78bfa);
        }
        .cat-icon.life {
            background: linear-gradient(135deg, #ec4899, #f472b6);
        }
        .cat-icon.security {
            background: linear-gradient(135deg, #14b8a6, #2dd4bf);
        }

        .category-card h3 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #1e293b;
            margin: 0 0 0.3rem;
        }

        .category-card .cat-count {
            font-size: 0.8rem;
            color: #94a3b8;
        }

        @media (max-width: 860px) {
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 0.85rem;
            }
        }

        @media (max-width: 520px) {
            .category-grid {
                grid-template-columns: 1fr 1fr;
                gap: 0.65rem;
            }

            .category-card {
                padding: 1.15rem 0.85rem;
            }

            .category-card .cat-icon {
                width: 44px;
                height: 44px;
                font-size: 1.2rem;
            }

            .category-card h3 {
                font-size: 0.85rem;
            }
        }

        /* ========== APP CARDS (HOT LIST) ========== */
        .app-card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.25rem;
        }

        .app-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            transition: all var(--transition-smooth);
            border: 1px solid transparent;
            position: relative;
        }

        .app-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: #e0e7ff;
        }

        .app-card .app-icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
        }

        .app-card .app-info {
            flex: 1;
            min-width: 0;
        }

        .app-card .app-name {
            font-weight: 600;
            font-size: 0.95rem;
            color: #1e293b;
            margin: 0 0 0.2rem;
        }

        .app-card .app-desc {
            font-size: 0.8rem;
            color: #64748b;
            margin: 0 0 0.5rem;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .app-card .app-meta {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.75rem;
            color: #94a3b8;
        }

        .app-card .app-meta .rating {
            color: #f59e0b;
        }

        .app-card .app-meta .rating i {
            font-size: 0.7rem;
        }

        .app-card .app-badge {
            display: inline-block;
            padding: 0.18rem 0.55rem;
            border-radius: 1rem;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        .badge-hot {
            background: #fef2f2;
            color: #ef4444;
        }
        .badge-new {
            background: #ecfdf5;
            color: #10b981;
        }
        .badge-pop {
            background: #eff6ff;
            color: #3b82f6;
        }
        .badge-rec {
            background: #fffbeb;
            color: #f59e0b;
        }

        @media (max-width: 860px) {
            .app-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 520px) {
            .app-card-grid {
                grid-template-columns: 1fr;
            }

            .app-card {
                padding: 1.15rem;
                gap: 0.75rem;
            }

            .app-card .app-icon-wrap {
                width: 42px;
                height: 42px;
                font-size: 1.1rem;
                border-radius: 10px;
            }
        }

        /* ========== STEPS / FLOW ========== */
        .steps-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            position: relative;
        }

        .step-card {
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--color-brand);
            color: #fff;
            font-weight: 700;
            font-size: 1.15rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 0.85rem;
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
        }

        .step-card h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #1e293b;
            margin: 0 0 0.35rem;
        }

        .step-card p {
            font-size: 0.8rem;
            color: #64748b;
            margin: 0;
            line-height: 1.5;
        }

        @media (max-width: 860px) {
            .steps-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.25rem;
            }
        }

        @media (max-width: 520px) {
            .steps-row {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }

            .step-number {
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
        }

        /* ========== STATS BAR ========== */
        .stats-bar {
            background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
            border-radius: var(--radius-xl);
            padding: 2.5rem 2rem;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            text-align: center;
            color: #fff;
            box-shadow: 0 12px 30px rgba(79, 70, 229, 0.25);
        }

        .stat-item .stat-number {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            display: block;
        }

        .stat-item .stat-label {
            font-size: 0.85rem;
            opacity: 0.85;
            margin-top: 0.25rem;
        }

        @media (max-width: 860px) {
            .stats-bar {
                grid-template-columns: repeat(2, 1fr);
                padding: 2rem 1.5rem;
                gap: 1.25rem;
            }

            .stat-item .stat-number {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 520px) {
            .stats-bar {
                grid-template-columns: 1fr 1fr;
                padding: 1.5rem 1rem;
                gap: 1rem;
                border-radius: var(--radius-lg);
            }

            .stat-item .stat-number {
                font-size: 1.35rem;
            }

            .stat-item .stat-label {
                font-size: 0.75rem;
            }
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.65rem;
        }

        .faq-item {
            background: #fff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            border: 1px solid #f1f5f9;
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: #e0e7ff;
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 1.1rem 1.25rem;
            text-align: left;
            font-weight: 600;
            font-size: 0.95rem;
            color: #1e293b;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.75rem;
            transition: color var(--transition-fast);
        }

        .faq-question:hover {
            color: var(--color-brand);
        }

        .faq-question i {
            font-size: 0.85rem;
            color: #94a3b8;
            transition: transform var(--transition-smooth);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-brand);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 0 1.25rem 1.1rem;
            font-size: 0.875rem;
            color: #475569;
            line-height: 1.7;
        }

        @media (max-width: 520px) {
            .faq-question {
                font-size: 0.875rem;
                padding: 0.9rem 1rem;
            }

            .faq-answer-inner {
                padding: 0 1rem 0.9rem;
                font-size: 0.8rem;
            }
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(160deg, #eef2ff 0%, #f8fafc 60%, #ecfdf5 100%);
            border-radius: var(--radius-xl);
            padding: 3rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section h2 {
            font-size: 1.65rem;
            font-weight: 700;
            color: #1e293b;
            margin: 0 0 0.6rem;
        }

        .cta-section p {
            color: #64748b;
            margin: 0 0 1.5rem;
            font-size: 0.95rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-section .btn {
            font-size: 1rem;
            padding: 0.85rem 2.2rem;
        }

        @media (max-width: 520px) {
            .cta-section {
                padding: 2rem 1.25rem;
                border-radius: var(--radius-lg);
            }

            .cta-section h2 {
                font-size: 1.3rem;
            }

            .cta-section p {
                font-size: 0.85rem;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #1e293b;
            color: #cbd5e1;
            padding: 3rem 0 0;
            margin-top: 2rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid #334155;
        }

        .footer-brand .footer-logo {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            display: block;
            margin-bottom: 0.6rem;
        }

        .footer-brand p {
            font-size: 0.85rem;
            line-height: 1.6;
            color: #94a3b8;
            margin: 0;
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 600;
            color: #e2e8f0;
            margin: 0 0 0.75rem;
            letter-spacing: 0.02em;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 0.4rem;
        }

        .footer-col ul li a {
            font-size: 0.825rem;
            color: #94a3b8;
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            text-align: center;
            padding: 1.25rem 0;
            font-size: 0.8rem;
            color: #64748b;
        }

        .footer-bottom p {
            margin: 0;
        }

        @media (max-width: 860px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1.5rem;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }

            .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }

            .site-footer {
                padding: 2rem 0 0;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        /* ========== UTILITY ========== */
        .text-center {
            text-align: center;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mt-3 {
            margin-top: 3rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .bg-white {
            background: #fff;
        }
        .rounded-xl {
            border-radius: var(--radius-xl);
        }
        .shadow-card {
            box-shadow: var(--shadow-card);
        }

/* roulang page: category4 */
/* ============ 设计变量 ============ */
        :root {
            --color-primary: #2563EB;
            --color-primary-dark: #1D4ED8;
            --color-primary-darker: #1E40AF;
            --color-primary-light: #DBEAFE;
            --color-primary-lighter: #EFF6FF;
            --color-accent: #F97316;
            --color-accent-dark: #EA580C;
            --color-accent-light: #FFF7ED;
            --color-success: #10B981;
            --color-success-light: #ECFDF5;
            --color-warning: #F59E0B;
            --color-warning-light: #FFFBEB;
            --color-bg: #F8FAFC;
            --color-bg-alt: #F1F5F9;
            --color-white: #FFFFFF;
            --color-text: #1E293B;
            --color-text-secondary: #475569;
            --color-text-muted: #64748B;
            --color-text-light: #94A3B8;
            --color-border: #E2E8F0;
            --color-border-light: #F1F5F9;
            --color-card-bg: #FFFFFF;
            --color-footer-bg: #0F172A;
            --color-footer-text: #CBD5E1;
            --color-footer-muted: #94A3B8;
            --radius-xs: 4px;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-2xl: 24px;
            --radius-full: 9999px;
            --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08), 0 4px 10px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.12), 0 8px 20px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 16px 40px rgba(0, 0, 0, 0.1), 0 6px 16px rgba(0, 0, 0, 0.05);
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --nav-height: 68px;
        }

        /* ============ 基础 Reset ============ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
            background: none;
        }

        input {
            font-family: inherit;
            outline: none;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
        }

        /* ============ 容器 ============ */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ============ Header & 导航 ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-white);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-xs);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .header-logo .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            border-radius: var(--radius-md);
            color: #fff;
            font-size: 1.1rem;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
        }

        .nav-links a {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-links a:hover {
            color: var(--color-primary);
            background: var(--color-primary-lighter);
        }

        .nav-links a.active {
            color: var(--color-primary);
            background: var(--color-primary-light);
            font-weight: 600;
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background: var(--color-primary);
            border-radius: var(--radius-full);
        }

        .nav-cta-btn {
            background: var(--color-accent) !important;
            color: #fff !important;
            font-weight: 600 !important;
            padding: 9px 20px !important;
            border-radius: var(--radius-full) !important;
            box-shadow: 0 2px 8px rgba(249, 115, 22, 0.35);
            margin-left: 6px;
        }

        .nav-cta-btn:hover {
            background: var(--color-accent-dark) !important;
            color: #fff !important;
            box-shadow: 0 4px 14px rgba(249, 115, 22, 0.45) !important;
            transform: translateY(-1px);
        }

        .nav-cta-btn.active::after {
            display: none;
        }

        /* 汉堡菜单按钮 */
        .hamburger-btn {
            display: none;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--color-border);
            background: var(--color-white);
            color: var(--color-text);
            font-size: 1.2rem;
            cursor: pointer;
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }

        .hamburger-btn:hover {
            background: var(--color-bg);
            border-color: var(--color-primary);
            color: var(--color-primary);
        }

        .hamburger-btn.active {
            background: var(--color-primary-light);
            border-color: var(--color-primary);
            color: var(--color-primary);
        }

        /* ============ Hero 首屏 ============ */
        .hero-section {
            background: linear-gradient(170deg, #EFF6FF 0%, #F8FAFC 30%, #FFFFFF 100%);
            padding: 64px 0 72px;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -180px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -120px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(249, 115, 22, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-content {
            text-align: center;
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-full);
            padding: 6px 18px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--color-primary);
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
        }

        .hero-badge .badge-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-success);
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5);
            }
            50% {
                box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
            }
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--color-text);
            margin-bottom: 16px;
            line-height: 1.2;
        }

        .hero-title .highlight {
            color: var(--color-primary);
            position: relative;
        }

        .hero-title .highlight-accent {
            color: var(--color-accent);
        }

        .hero-desc {
            font-size: 1.15rem;
            color: var(--color-text-muted);
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        .hero-search-wrap {
            display: flex;
            align-items: center;
            max-width: 540px;
            margin: 0 auto 28px;
            background: var(--color-white);
            border: 2px solid var(--color-border);
            border-radius: var(--radius-full);
            padding: 4px;
            box-shadow: var(--shadow-lg);
            transition: all var(--transition-base);
        }

        .hero-search-wrap:focus-within {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-xl), 0 0 0 6px rgba(37, 99, 235, 0.06);
        }

        .hero-search-wrap input {
            flex: 1;
            border: none;
            padding: 14px 20px;
            font-size: 0.95rem;
            color: var(--color-text);
            background: transparent;
            min-width: 0;
        }

        .hero-search-wrap input::placeholder {
            color: var(--color-text-light);
        }

        .hero-search-wrap .search-btn {
            padding: 12px 28px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.95rem;
            white-space: nowrap;
            transition: all var(--transition-fast);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }

        .hero-search-wrap .search-btn:hover {
            background: var(--color-primary-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
            transform: translateY(-1px);
        }

        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 7px 15px;
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .hero-tag:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: var(--color-primary-lighter);
            transform: translateY(-1px);
            box-shadow: var(--shadow-sm);
        }

        .hero-tag i {
            font-size: 0.75rem;
            color: var(--color-accent);
        }

        /* ============ 板块通用样式 ============ */
        .section {
            padding: 80px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }

        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-primary);
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 10px;
            background: var(--color-primary-lighter);
            padding: 5px 14px;
            border-radius: var(--radius-full);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            color: var(--color-text);
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 560px;
            margin: 0 auto;
        }

        /* ============ 特色卡片网格 ============ */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
            opacity: 0;
            transition: opacity var(--transition-base);
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
            border-color: transparent;
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            font-size: 1.4rem;
            margin-bottom: 18px;
            transition: transform var(--transition-base);
        }

        .feature-card:hover .feature-icon {
            transform: scale(1.08);
        }

        .feature-icon.blue {
            background: #EFF6FF;
            color: #2563EB;
        }
        .feature-icon.green {
            background: #ECFDF5;
            color: #10B981;
        }
        .feature-icon.orange {
            background: #FFF7ED;
            color: #F97316;
        }
        .feature-icon.purple {
            background: #F5F3FF;
            color: #7C3AED;
        }

        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .feature-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        /* ============ 工具推荐卡片网格 ============ */
        .tools-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .tool-card {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            display: flex;
            flex-direction: column;
            gap: 14px;
            transition: all var(--transition-base);
            position: relative;
        }

        .tool-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-card-hover);
            border-color: transparent;
        }

        .tool-card-header {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }

        .tool-card-icon {
            flex-shrink: 0;
            width: 50px;
            height: 50px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
        }

        .tool-card-icon.sys {
            background: #EFF6FF;
            color: #2563EB;
        }
        .tool-card-icon.file {
            background: #ECFDF5;
            color: #10B981;
        }
        .tool-card-icon.data {
            background: #FFF7ED;
            color: #F97316;
        }
        .tool-card-icon.compress {
            background: #FEF3C7;
            color: #D97706;
        }
        .tool-card-icon.screen {
            background: #F5F3FF;
            color: #7C3AED;
        }
        .tool-card-icon.security {
            background: #FCE7F3;
            color: #DB2777;
        }

        .tool-card-info h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 2px;
        }

        .tool-card-info .tool-version {
            font-size: 0.78rem;
            color: var(--color-text-light);
        }

        .tool-card p {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.55;
            flex: 1;
        }

        .tool-card-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tool-tag {
            display: inline-block;
            padding: 4px 10px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--color-bg-alt);
            color: var(--color-text-muted);
        }

        .tool-tag.free {
            background: var(--color-success-light);
            color: #059669;
        }
        .tool-tag.hot {
            background: #FEF2F2;
            color: #DC2626;
        }

        .tool-card .btn-download {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 10px 20px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            transition: all var(--transition-fast);
            width: 100%;
            text-align: center;
        }

        .tool-card .btn-download:hover {
            background: var(--color-primary-dark);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
        }

        /* ============ 场景卡片 ============ */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .scenario-card {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            text-align: center;
            transition: all var(--transition-base);
        }

        .scenario-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: transparent;
            transform: translateY(-4px);
        }

        .scenario-icon-wrap {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 64px;
            height: 64px;
            border-radius: var(--radius-xl);
            font-size: 1.6rem;
            margin-bottom: 20px;
            background: var(--color-primary-lighter);
            color: var(--color-primary);
        }

        .scenario-card:nth-child(2) .scenario-icon-wrap {
            background: var(--color-success-light);
            color: #10B981;
        }
        .scenario-card:nth-child(3) .scenario-icon-wrap {
            background: var(--color-accent-light);
            color: #F97316;
        }

        .scenario-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .scenario-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        /* ============ 流程步骤 ============ */
        .steps-section {
            background: var(--color-white);
        }

        .steps-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            counter-reset: step;
        }

        .step-item {
            text-align: center;
            position: relative;
            padding-top: 50px;
        }

        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
        }

        .step-item h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .step-item p {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.55;
        }

        .step-connector {
            display: none;
        }

        /* ============ FAQ ============ */
        .faq-section {
            background: var(--color-bg);
        }

        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--color-primary);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text);
            text-align: left;
            cursor: pointer;
            transition: all var(--transition-fast);
            gap: 16px;
        }

        .faq-question:hover {
            color: var(--color-primary);
            background: var(--color-primary-lighter);
        }

        .faq-question i {
            flex-shrink: 0;
            transition: transform var(--transition-base);
            color: var(--color-text-muted);
            font-size: 0.85rem;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 0.92rem;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        /* ============ CTA 区域 ============ */
        .cta-section {
            background: linear-gradient(135deg, #1E40AF 0%, #2563EB 40%, #1D4ED8 100%);
            padding: 64px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -100px;
            width: 350px;
            height: 350px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -80px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.04) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-content {
            position: relative;
            z-index: 1;
        }

        .cta-title {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.02em;
        }

        .cta-desc {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 500px;
            margin: 0 auto 30px;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            background: #fff;
            color: var(--color-primary);
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius-full);
            transition: all var(--transition-fast);
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
        }

        .cta-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0, 0, 0, 0.3);
            background: #f0f4ff;
        }

        .cta-btn i {
            font-size: 0.9rem;
        }

        /* ============ 统计条 ============ */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
        }

        .stat-item {
            text-align: center;
            padding: 8px;
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 6px;
        }

        .stat-number .stat-plus {
            color: var(--color-accent);
        }

        .stat-label {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            font-weight: 500;
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 56px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }

        .footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            display: block;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }

        .footer-brand p {
            font-size: 0.88rem;
            color: var(--color-footer-muted);
            line-height: 1.6;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--color-footer-muted);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.82rem;
            color: var(--color-footer-muted);
        }

        /* ============ 响应式 - 平板 ============ */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .tools-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scenarios-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-list {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
            .stats-bar {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .hero-title {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .nav-links a {
                padding: 7px 11px;
                font-size: 0.85rem;
            }
            .nav-cta-btn {
                padding: 7px 15px !important;
                font-size: 0.82rem !important;
            }
            .header-logo {
                font-size: 1.15rem;
            }
            .header-logo .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 0.95rem;
            }
        }

        /* ============ 响应式 - 手机 ============ */
        @media (max-width: 768px) {
            .site-header {
                height: 60px;
            }
            :root {
                --nav-height: 60px;
            }
            .hamburger-btn {
                display: flex;
            }
            .nav-links {
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                flex-direction: column;
                background: var(--color-white);
                border-bottom: 2px solid var(--color-border);
                box-shadow: var(--shadow-xl);
                padding: 12px 16px;
                gap: 4px;
                display: none;
                z-index: 999;
            }
            .nav-links.show {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                font-size: 0.95rem;
                justify-content: flex-start;
            }
            .nav-links a.active::after {
                display: none;
            }
            .nav-links a.active {
                border-left: 3px solid var(--color-primary);
            }
            .nav-cta-btn {
                margin-left: 0;
                justify-content: center !important;
                margin-top: 4px;
            }
            .hero-section {
                padding: 40px 0 48px;
            }
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .hero-search-wrap {
                flex-direction: column;
                border-radius: var(--radius-md);
                padding: 8px;
                gap: 8px;
            }
            .hero-search-wrap input {
                width: 100%;
                padding: 12px 16px;
            }
            .hero-search-wrap .search-btn {
                width: 100%;
                border-radius: var(--radius-sm);
                padding: 12px;
            }
            .hero-tags {
                gap: 6px;
            }
            .hero-tag {
                font-size: 0.78rem;
                padding: 5px 10px;
            }
            .section {
                padding: 48px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-title {
                font-size: 1.45rem;
            }
            .section-desc {
                font-size: 0.9rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .tools-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .steps-list {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .stats-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
                padding: 20px 16px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .cta-title {
                font-size: 1.5rem;
            }
            .cta-desc {
                font-size: 0.9rem;
            }
            .cta-btn {
                padding: 12px 28px;
                font-size: 0.9rem;
            }
            .container {
                padding: 0 16px;
            }
            .feature-card {
                padding: 24px 18px;
            }
            .tool-card {
                padding: 22px 18px;
            }
            .scenario-card {
                padding: 26px 20px;
            }
        }

        @media (max-width: 480px) {
            .hero-title {
                font-size: 1.4rem;
            }
            .hero-badge {
                font-size: 0.78rem;
                padding: 5px 12px;
            }
            .stats-bar {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
                padding: 16px 10px;
            }
            .stat-number {
                font-size: 1.3rem;
            }
            .stat-label {
                font-size: 0.75rem;
            }
            .tool-card .btn-download {
                font-size: 0.82rem;
                padding: 10px 16px;
            }
        }