/* roulang page: index */
:root {
            --primary: #0E6F5C;
            --primary-dark: #0A4D40;
            --accent: #D6A84B;
            --bg: #F6F8F7;
            --card-bg: #FFFFFF;
            --text: #1B2A26;
            --text-secondary: #5C6B66;
            --border: #DCE4E0;
            --success: #2F9E6E;
            --warning: #D98A2B;
            --error: #C34F4F;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(14,111,92,0.06);
            --shadow-card-hover: 0 12px 30px rgba(14,111,92,0.12);
            --shadow-btn-hover: 0 8px 18px rgba(14,111,92,0.18);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --container: 1200px;
            --header-height: 68px;
            --section-padding: 72px;
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

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

        button,
        input {
            font-family: var(--font-family);
            font-size: inherit;
            outline: none;
            border: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

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

        section {
            padding-top: var(--section-padding);
            padding-bottom: var(--section-padding);
        }

        /* ========== Header & Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #fff;
            height: var(--header-height);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .site-header.scrolled {
            border-bottom-color: var(--border);
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }

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

        .logo {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.3px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
        }

        .nav-menu a {
            font-size: 15px;
            color: var(--text);
            padding: 6px 0;
            position: relative;
            font-weight: 500;
        }

        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary);
        }

        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }

        .nav-menu a:hover::after,
        .nav-menu a.active::after {
            width: 100%;
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 22px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            transition: all var(--transition);
            white-space: nowrap;
            border: 1px solid transparent;
        }

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

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

        .btn-primary:active {
            transform: translateY(1px);
        }

        .btn-accent {
            background: var(--accent);
            color: #1B2A26;
            font-weight: 700;
        }

        .btn-accent:hover {
            background: #c99a3c;
            box-shadow: 0 8px 20px rgba(214,168,75,0.3);
            color: #1B2A26;
        }

        .btn-accent:active {
            transform: translateY(1px);
        }

        .btn-outline {
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-outline:hover {
            background: rgba(14,111,92,0.06);
            color: var(--primary-dark);
        }

        .btn-sm {
            padding: 9px 16px;
            font-size: 14px;
            border-radius: var(--radius-sm);
        }

        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
            border-radius: var(--radius-btn);
            height: 48px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 28px;
            height: 22px;
            background: none;
            padding: 0;
        }

        .hamburger span {
            display: block;
            width: 100%;
            height: 2.5px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: #fff;
            z-index: 99;
            flex-direction: column;
            padding: 24px;
            overflow-y: auto;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
        }

        .mobile-close {
            font-size: 30px;
            color: var(--text);
            background: none;
            padding: 4px 8px;
            line-height: 1;
        }

        .mobile-menu nav ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .mobile-menu nav a {
            display: block;
            padding: 14px 16px;
            font-size: 17px;
            font-weight: 500;
            color: var(--text);
            border-radius: var(--radius-sm);
            min-height: 44px;
            display: flex;
            align-items: center;
        }

        .mobile-menu nav a:hover,
        .mobile-menu nav a.active {
            background: rgba(14,111,92,0.08);
            color: var(--primary);
        }

        .mobile-menu .btn {
            margin-top: 16px;
            width: 100%;
            height: 48px;
        }

        /* ========== Hero ========== */
        .hero-section {
            padding: 64px 0 72px;
            background: linear-gradient(180deg, #FFFFFF 0%, #F6F8F7 100%);
            overflow: hidden;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 0.95fr;
            gap: 48px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: clamp(30px, 4vw, 42px);
            line-height: 1.2;
            color: var(--text);
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .hero-content h1 .highlight {
            color: var(--primary);
        }

        .hero-sub {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 28px;
            max-width: 540px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 24px;
        }

        .hero-actions .btn {
            height: 48px;
            min-width: 160px;
        }

        .hero-meta {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-secondary);
        }

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

        .hero-meta .dot {
            width: 5px;
            height: 5px;
            border-radius: 50%;
            background: var(--success);
            display: inline-block;
        }

        .hero-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            background: #EFF3F1;
            aspect-ratio: 5/4;
            box-shadow: var(--shadow-card-hover);
        }

        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .hero-image-badge {
            position: absolute;
            bottom: 16px;
            left: 16px;
            background: rgba(255,255,255,0.92);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary-dark);
            border: 1px solid var(--border);
            backdrop-filter: blur(4px);
        }

        /* ========== Version Bar ========== */
        .version-bar-section {
            padding: 0;
            margin-top: -36px;
            position: relative;
            z-index: 1;
        }

        .version-bar {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            box-shadow: var(--shadow-card);
        }

        .version-bar-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text);
        }

        .version-bar-item .label {
            color: var(--text-secondary);
            font-size: 13px;
        }

        .version-bar-item .value {
            font-weight: 700;
            color: var(--primary-dark);
            font-size: 15px;
        }

        .version-bar-item .badge-safe {
            background: rgba(47,158,110,0.1);
            color: var(--success);
            padding: 3px 10px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            white-space: nowrap;
        }

        /* ========== Download Cards ========== */
        .download-section {
            background: var(--bg);
        }

        .section-header {
            margin-bottom: 36px;
        }

        .section-header h2 {
            font-size: clamp(24px, 3vw, 30px);
            line-height: 1.3;
            color: var(--text);
            font-weight: 700;
            margin-bottom: 8px;
        }

        .section-header p {
            font-size: 15px;
            color: var(--text-secondary);
            max-width: 620px;
        }

        .download-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .download-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .download-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
            border-color: rgba(14,111,92,0.2);
        }

        .download-card-image {
            aspect-ratio: 16/9;
            background: #EFF3F1;
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .download-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .download-card-body {
            padding: 20px 24px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .download-card-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
        }

        .download-card-info {
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 14px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .download-card-info span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .download-card .btn {
            margin-top: auto;
            width: 100%;
            height: 44px;
        }

        .download-card .btn-accent {
            color: #1B2A26;
        }

        /* ========== Feature Highlights ========== */
        .features-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition);
        }

        .feature-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(14,111,92,0.2);
        }

        .feature-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: rgba(14,111,92,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 14px;
            font-size: 20px;
            color: var(--primary);
        }

        .feature-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== Install Steps ========== */
        .steps-section {
            background: var(--bg);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }

        .step-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 22px 20px;
            position: relative;
            counter-increment: step;
            transition: all var(--transition);
        }

        .step-item:hover {
            box-shadow: var(--shadow-card);
        }

        .step-number {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 15px;
            margin-bottom: 12px;
        }

        .step-item h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 5px;
        }

        .step-item p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ========== CMS News Section ========== */
        .news-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .news-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .news-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }

        .news-card-image {
            aspect-ratio: 16/9;
            background: #EFF3F1;
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .news-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .news-card-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .news-category {
            display: inline-block;
            background: rgba(14,111,92,0.08);
            color: var(--primary);
            padding: 3px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
            align-self: flex-start;
        }

        .news-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.4;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-summary {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-meta {
            margin-top: auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--text-secondary);
        }

        .news-link {
            color: var(--primary);
            font-weight: 600;
            font-size: 13px;
        }

        .news-link:hover {
            color: var(--primary-dark);
        }

        .news-empty {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-secondary);
            font-size: 15px;
            grid-column: 1 / -1;
            background: var(--card-bg);
            border: 1px dashed var(--border);
            border-radius: var(--radius-lg);
        }

        /* ========== Security Section ========== */
        .security-section {
            background: var(--primary-dark);
            color: #fff;
            padding-top: 64px;
            padding-bottom: 64px;
        }

        .security-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .security-content h2 {
            font-size: clamp(24px, 3vw, 30px);
            line-height: 1.3;
            color: #fff;
            margin-bottom: 14px;
        }

        .security-content p {
            font-size: 15px;
            color: rgba(255,255,255,0.75);
            line-height: 1.8;
            max-width: 480px;
        }

        .security-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            list-style: none;
        }

        .security-list li {
            background: rgba(255,255,255,0.07);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: var(--radius-sm);
            padding: 16px 18px;
            font-size: 14px;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: background var(--transition);
        }

        .security-list li:hover {
            background: rgba(255,255,255,0.12);
        }

        .security-list .check {
            color: var(--accent);
            font-weight: 700;
            font-size: 16px;
            flex-shrink: 0;
        }

        /* ========== Help Section ========== */
        .help-section {
            background: var(--bg);
        }

        .help-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 14px;
            list-style: none;
            margin-top: 20px;
        }

        .help-list li {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 16px 20px;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all var(--transition);
        }

        .help-list li:hover {
            border-color: rgba(14,111,92,0.25);
            box-shadow: var(--shadow-card);
        }

        .help-list .icon-help {
            color: var(--warning);
            font-weight: 700;
            flex-shrink: 0;
        }

        .help-list a {
            color: var(--text);
            font-weight: 500;
        }

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

        /* ========== Category Entry ========== */
        .category-entry-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .category-entry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .category-entry-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .category-entry-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }

        .category-entry-image {
            aspect-ratio: 16/9;
            background: #EFF3F1;
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .category-entry-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .category-entry-body {
            padding: 20px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .category-entry-body h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
        }

        .category-entry-body p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 16px;
        }

        .category-entry-body .btn {
            margin-top: auto;
            align-self: flex-start;
        }

        /* ========== Version Timeline ========== */
        .timeline-section {
            background: var(--bg);
        }

        .timeline {
            position: relative;
            padding-left: 30px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border);
        }

        .timeline-item {
            position: relative;
            padding-bottom: 28px;
            padding-left: 16px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -26px;
            top: 6px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid #fff;
            box-shadow: 0 0 0 2px var(--primary);
        }

        .timeline-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px 22px;
            transition: all var(--transition);
        }

        .timeline-card:hover {
            box-shadow: var(--shadow-card);
        }

        .timeline-version {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .timeline-version .badge-new {
            background: var(--accent);
            color: #1B2A26;
            padding: 2px 10px;
            border-radius: 20px;
            font-size: 11px;
            font-weight: 700;
        }

        .timeline-date {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        .timeline-points {
            margin-top: 8px;
            font-size: 14px;
            color: var(--text);
            line-height: 1.7;
            list-style: none;
        }

        .timeline-points li {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            margin-top: 4px;
        }

        .timeline-points li::before {
            content: '·';
            color: var(--primary);
            font-weight: 700;
            flex-shrink: 0;
        }

        /* ========== Stats ========== */
        .stats-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .stat-card {
            text-align: center;
            padding: 28px 16px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            transition: all var(--transition);
        }

        .stat-card:hover {
            box-shadow: var(--shadow-card);
        }

        .stat-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary-dark);
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
        }

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

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
        }

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

        .faq-item.active {
            border-color: var(--primary);
        }

        .faq-question {
            width: 100%;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            background: none;
            min-height: 56px;
        }

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

        .faq-arrow {
            font-size: 14px;
            color: var(--text-secondary);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 22px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            background: rgba(246,248,247,0.6);
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding-top: 12px;
            padding-bottom: 18px;
        }

        /* ========== Reviews ========== */
        .reviews-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .review-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 22px;
            transition: all var(--transition);
        }

        .review-card:hover {
            box-shadow: var(--shadow-card);
        }

        .review-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
        }

        .review-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #EFF3F1;
            border: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--primary);
            font-weight: 600;
            flex-shrink: 0;
        }

        .review-name {
            font-size: 15px;
            font-weight: 700;
            color: var(--text);
        }

        .review-time {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .review-text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* ========== Subscribe Form ========== */
        .subscribe-section {
            background: var(--bg);
        }

        .subscribe-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            display: flex;
            align-items: center;
            gap: 28px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-card);
        }

        .subscribe-info {
            flex: 1;
            min-width: 260px;
        }

        .subscribe-info h2 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
        }

        .subscribe-info p {
            font-size: 13px;
            color: var(--text-secondary);
        }

        .subscribe-form {
            display: flex;
            gap: 12px;
            flex: 1;
            min-width: 260px;
        }

        .subscribe-form input {
            flex: 1;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius-btn);
            height: 46px;
            font-size: 14px;
            color: var(--text);
            background: #fff;
            transition: border-color var(--transition);
            min-width: 0;
        }

        .subscribe-form input:focus {
            border-color: var(--primary);
            outline: 2px solid rgba(14,111,92,0.15);
            outline-offset: 0;
        }

        .subscribe-form .btn {
            height: 46px;
            white-space: nowrap;
        }

        .subscribe-note {
            font-size: 12px;
            color: var(--text-secondary);
            margin-top: 8px;
        }

        /* ========== Logo Wall ========== */
        .logowall-section {
            background: #FAFBFB;
            border-top: 1px solid var(--border);
            padding-top: 40px;
            padding-bottom: 40px;
        }

        .logowall {
            display: flex;
            gap: 32px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            align-items: center;
            padding: 8px 0;
        }

        .logowall::-webkit-scrollbar {
            display: none;
        }

        .logowall-item {
            flex-shrink: 0;
            width: 120px;
            height: 48px;
            background: #E8ECEA;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #A8B4AE;
            font-size: 12px;
            font-weight: 500;
            letter-spacing: 0.5px;
            opacity: 0.7;
        }

        /* ========== Bottom CTA ========== */
        .bottom-cta-section {
            background: var(--primary-dark);
            padding-top: 56px;
            padding-bottom: 56px;
            text-align: center;
        }

        .bottom-cta-section h2 {
            font-size: clamp(24px, 3vw, 28px);
            color: #fff;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .bottom-cta-section p {
            font-size: 14px;
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
        }

        .bottom-cta-section .btn-accent {
            min-width: 180px;
            height: 48px;
            font-size: 16px;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: #0A4D40;
            color: rgba(255,255,255,0.75);
            padding-top: 48px;
            padding-bottom: 20px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand h3 {
            font-size: 19px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }

        .footer-brand p {
            font-size: 13px;
            color: rgba(255,255,255,0.55);
            line-height: 1.7;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

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

        .footer-col a {
            font-size: 13px;
            color: rgba(255,255,255,0.6);
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.12);
            padding-top: 16px;
            font-size: 12px;
            color: rgba(255,255,255,0.45);
            text-align: center;
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            :root {
                --section-padding: 56px;
            }

            .hero-grid {
                gap: 32px;
            }

            .download-grid,
            .features-grid,
            .news-grid,
            .category-entry-grid {
                grid-template-columns: repeat(2, 1fr);
            }

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

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

            .security-grid {
                gap: 28px;
            }

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

        @media (max-width: 768px) {
            :root {
                --section-padding: 48px;
                --header-height: 60px;
            }

            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .nav-menu {
                display: none;
            }

            .header-cta .btn {
                display: none;
            }

            .hamburger {
                display: flex;
            }

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

            .hero-content h1 {
                font-size: 27px;
            }

            .hero-actions {
                flex-direction: column;
            }

            .hero-actions .btn {
                width: 100%;
            }

            .hero-image {
                aspect-ratio: 16/10;
            }

            .version-bar {
                flex-direction: column;
                align-items: flex-start;
                padding: 16px 20px;
            }

            .download-grid,
            .features-grid,
            .news-grid,
            .category-entry-grid,
            .help-list,
            .reviews-grid {
                grid-template-columns: 1fr;
            }

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

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

            .security-list {
                grid-template-columns: 1fr;
            }

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

            .subscribe-card {
                flex-direction: column;
                padding: 24px 20px;
            }

            .subscribe-form {
                width: 100%;
                flex-direction: column;
            }

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

        @media (max-width: 520px) {
            .hero-content h1 {
                font-size: 24px;
            }

            .hero-sub {
                font-size: 15px;
            }

            .section-header h2 {
                font-size: 22px;
            }

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

            .stat-number {
                font-size: 27px;
            }

            .timeline {
                padding-left: 22px;
            }

            .timeline-item {
                padding-left: 8px;
            }

            .timeline-item::before {
                left: -20px;
                width: 10px;
                height: 10px;
            }

            .faq-question {
                padding: 14px 16px;
                font-size: 14px;
            }

            .faq-answer {
                padding: 0 16px;
                font-size: 14px;
            }

            .faq-item.active .faq-answer {
                padding-top: 10px;
                padding-bottom: 14px;
            }

            .btn-lg {
                padding: 12px 20px;
                font-size: 15px;
                height: 44px;
            }

            .logo {
                font-size: 16px;
            }

            .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 13px;
            }
        }

/* roulang page: article */
:root {
            --primary: #0E6F5C;
            --primary-dark: #0A4D40;
            --accent: #D6A84B;
            --bg: #F6F8F7;
            --card-bg: #FFFFFF;
            --text: #1B2A26;
            --text-secondary: #5C6B66;
            --border: #DCE4E0;
            --success: #2F9E6E;
            --warning: #D98A2B;
            --error: #C34F4F;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(14,111,92,0.06);
            --shadow-card-hover: 0 12px 30px rgba(14,111,92,0.12);
            --shadow-btn-hover: 0 8px 18px rgba(14,111,92,0.18);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --container: 1200px;
            --header-height: 68px;
            --section-padding: 72px;
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

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

        button,
        input {
            font-family: var(--font-family);
            font-size: inherit;
            outline: none;
            border: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

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

        section {
            padding-top: var(--section-padding);
            padding-bottom: var(--section-padding);
        }

        /* ========== Header & Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #fff;
            height: var(--header-height);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .site-header.scrolled {
            border-bottom-color: var(--border);
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }

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

        .logo {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.3px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-menu a {
            font-size: 15px;
            color: var(--text);
            padding: 6px 0;
            position: relative;
            font-weight: 500;
            display: inline-block;
        }

        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary);
        }

        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }

        .nav-menu a:hover::after,
        .nav-menu a.active::after {
            width: 100%;
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 22px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            transition: all var(--transition);
            white-space: nowrap;
            border: 1px solid transparent;
        }

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

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

        .btn-primary:active {
            transform: translateY(1px);
        }

        .btn-accent {
            background: var(--accent);
            color: #1B2A26;
            font-weight: 700;
        }

        .btn-accent:hover {
            background: #c99a3c;
            box-shadow: 0 8px 20px rgba(214,168,75,0.3);
            color: #1B2A26;
        }

        .btn-accent:active {
            transform: translateY(1px);
        }

        .btn-outline {
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-outline:hover {
            background: rgba(14,111,92,0.06);
            color: var(--primary-dark);
        }

        .btn-sm {
            padding: 9px 16px;
            font-size: 14px;
        }

        .btn-lg {
            padding: 14px 28px;
            font-size: 16px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }

        .hamburger:hover {
            background: rgba(14,111,92,0.06);
        }

        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
        }

        /* ========== Article Breadcrumb ========== */
        .breadcrumb-section {
            padding: 24px 0 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
        }

        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-secondary);
            flex-wrap: wrap;
        }

        .breadcrumb-nav a {
            color: var(--text-secondary);
        }

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

        .breadcrumb-sep {
            color: #b8c4bf;
            user-select: none;
        }

        .breadcrumb-current {
            color: var(--text);
            font-weight: 500;
            max-width: 320px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        /* ========== Article Header ========== */
        .article-header-section {
            padding: 36px 0 32px;
            background: #fff;
            border-bottom: 1px solid var(--border);
        }

        .article-title {
            font-size: clamp(26px, 3vw, 36px);
            line-height: 1.35;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 18px;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .article-meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta-divider {
            width: 1px;
            height: 16px;
            background: var(--border);
        }

        .category-badge {
            display: inline-flex;
            align-items: center;
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            background: rgba(14,111,92,0.08);
            color: var(--primary);
            border: 1px solid rgba(14,111,92,0.15);
        }

        /* ========== Article Body ========== */
        .article-body-section {
            padding: 40px 0 48px;
            background: #fff;
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
            align-items: start;
        }

        .article-body {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text);
        }

        .article-body h2 {
            font-size: 24px;
            line-height: 1.4;
            font-weight: 700;
            color: var(--text);
            margin: 36px 0 16px;
            padding-left: 12px;
            border-left: 4px solid var(--primary);
        }

        .article-body h3 {
            font-size: 20px;
            line-height: 1.45;
            font-weight: 700;
            color: var(--text);
            margin: 28px 0 12px;
        }

        .article-body p {
            margin-bottom: 18px;
        }

        .article-body ul,
        .article-body ol {
            margin: 16px 0 20px;
            padding-left: 24px;
        }

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

        .article-body blockquote {
            margin: 24px 0;
            padding: 16px 20px;
            background: rgba(14,111,92,0.04);
            border-left: 3px solid var(--primary);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-size: 15px;
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 24px 0;
            border: 1px solid var(--border);
        }

        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-body .alert-box {
            margin: 20px 0;
            padding: 16px 20px;
            border-radius: var(--radius-md);
            font-size: 14px;
            line-height: 1.7;
            border: 1px solid;
        }

        .article-body .alert-info {
            background: rgba(14,111,92,0.05);
            border-color: rgba(14,111,92,0.2);
            color: var(--primary-dark);
        }

        .article-body .alert-warning {
            background: rgba(217,138,43,0.08);
            border-color: rgba(217,138,43,0.25);
            color: #8a5a1a;
        }

        /* ========== Article Sidebar ========== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 20px;
            position: sticky;
            top: calc(var(--header-height) + 20px);
        }

        .sidebar-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 22px;
            box-shadow: var(--shadow-card);
        }

        .sidebar-card h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border);
        }

        .sidebar-card ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .sidebar-card ul li {
            padding: 8px 0;
            border-bottom: 1px solid rgba(220,228,224,0.5);
            font-size: 14px;
            color: var(--text-secondary);
        }

        .sidebar-card ul li:last-child {
            border-bottom: none;
        }

        .sidebar-card ul li a {
            color: var(--text);
            display: block;
            transition: color var(--transition), padding-left var(--transition);
        }

        .sidebar-card ul li a:hover {
            color: var(--primary);
            padding-left: 6px;
        }

        .download-guide-card {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            border-radius: var(--radius-lg);
            padding: 24px 22px;
            color: #fff;
        }

        .download-guide-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }

        .download-guide-card p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255,255,255,0.85);
            margin-bottom: 16px;
        }

        .download-guide-card .btn {
            width: 100%;
        }

        /* ========== Download CTA ========== */
        .article-cta-section {
            padding: 28px 0;
            background: var(--bg);
        }

        .article-cta-card {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 24px 30px;
            box-shadow: var(--shadow-card);
            flex-wrap: wrap;
        }

        .article-cta-text h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
        }

        .article-cta-text p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
        }

        /* ========== Tags & Share ========== */
        .article-tags-section {
            padding: 24px 0;
            background: var(--bg);
        }

        .tags-share-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }

        .article-tags {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .tag-label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .tag-badge {
            display: inline-flex;
            align-items: center;
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 13px;
            color: var(--text);
            background: #fff;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }

        .tag-badge:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(14,111,92,0.04);
        }

        .share-placeholder {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .share-dot {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #fff;
            border: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: var(--text-secondary);
            transition: all var(--transition);
        }

        .share-dot:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        /* ========== Related Posts ========== */
        .related-section {
            padding: 48px 0 56px;
            background: #fff;
        }

        .section-heading {
            font-size: clamp(22px, 2.5vw, 28px);
            font-weight: 700;
            color: var(--text);
            margin-bottom: 28px;
            position: relative;
            padding-bottom: 12px;
        }

        .section-heading::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 48px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
            border-color: rgba(14,111,92,0.25);
        }

        .related-card-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-bottom: 1px solid var(--border);
        }

        .related-card-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .related-card-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.5;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card-summary {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }

        .related-card-meta {
            font-size: 13px;
            color: var(--text-secondary);
        }

        /* ========== Back Entry ========== */
        .back-section {
            padding: 20px 0 28px;
            background: var(--bg);
        }

        .back-row {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .back-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 500;
            background: #fff;
            color: var(--text);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }

        .back-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(14,111,92,0.04);
        }

        /* ========== Update Notice ========== */
        .update-notice-section {
            padding: 16px 0 40px;
            background: var(--bg);
        }

        .update-notice {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: rgba(217,138,43,0.08);
            border: 1px solid rgba(217,138,43,0.25);
            border-radius: var(--radius-md);
            padding: 16px 22px;
            flex-wrap: wrap;
        }

        .update-notice-text {
            font-size: 14px;
            color: #7a4f16;
            font-weight: 500;
        }

        /* ========== Not Found ========== */
        .not-found {
            text-align: center;
            padding: 60px 20px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
        }

        .not-found h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }

        .not-found p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 20px;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.85);
            padding: 56px 0 0;
            margin-top: auto;
        }

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

        .footer-brand h3 {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255,255,255,0.7);
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }

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

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255,255,255,0.7);
            transition: color var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.12);
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.55);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            :root {
                --section-padding: 56px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }

            .article-layout {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .article-sidebar {
                position: static;
            }

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

        @media (max-width: 768px) {
            :root {
                --section-padding: 48px;
                --header-height: 60px;
            }

            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .nav-menu {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                gap: 0;
                padding: 12px 0;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 8px 20px rgba(0,0,0,0.08);
                display: none;
                z-index: 99;
            }

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

            .nav-menu a {
                display: block;
                padding: 14px 24px;
                font-size: 16px;
                width: 100%;
                text-align: center;
            }

            .nav-menu a::after {
                display: none;
            }

            .header-cta .btn {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .article-title {
                font-size: clamp(22px, 5vw, 28px);
            }

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

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

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

        @media (max-width: 520px) {
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .article-meta-divider {
                display: none;
            }

            .tags-share-row {
                flex-direction: column;
                align-items: flex-start;
            }

            .article-cta-card {
                padding: 18px 20px;
            }

            .update-notice {
                flex-direction: column;
                text-align: center;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #0E6F5C;
            --primary-dark: #0A4D40;
            --accent: #D6A84B;
            --bg: #F6F8F7;
            --card-bg: #FFFFFF;
            --text: #1B2A26;
            --text-secondary: #5C6B66;
            --border: #DCE4E0;
            --success: #2F9E6E;
            --warning: #D98A2B;
            --error: #C34F4F;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(14,111,92,0.06);
            --shadow-card-hover: 0 12px 30px rgba(14,111,92,0.12);
            --shadow-btn-hover: 0 8px 18px rgba(14,111,92,0.18);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --container: 1200px;
            --header-height: 68px;
            --section-padding: 72px;
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-family);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            margin: 0;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition), opacity var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: var(--font-family);
            font-size: inherit;
            outline: none;
            border: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        section {
            padding-top: var(--section-padding);
            padding-bottom: var(--section-padding);
        }
        /* ========== Header & Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #fff;
            height: var(--header-height);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            border-bottom-color: var(--border);
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.3px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-menu a {
            font-size: 15px;
            color: var(--text);
            padding: 6px 0;
            position: relative;
            font-weight: 500;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary);
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-menu a:hover::after,
        .nav-menu a.active::after {
            width: 100%;
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 22px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            transition: all var(--transition);
            white-space: nowrap;
            border: 1px solid transparent;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-btn-hover);
            color: #fff;
        }
        .btn-primary:active {
            transform: translateY(1px);
        }
        .btn-accent {
            background: var(--accent);
            color: #1B2A26;
            font-weight: 700;
        }
        .btn-accent:hover {
            background: #c99a3c;
            box-shadow: 0 8px 20px rgba(214,168,75,0.3);
            color: #1B2A26;
        }
        .btn-accent:active {
            transform: translateY(1px);
        }
        .btn-outline {
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
        }
        .btn-outline:hover {
            background: rgba(14,111,92,0.06);
            color: var(--primary-dark);
        }
        .btn-sm {
            padding: 9px 16px;
            font-size: 14px;
        }
        .btn-lg {
            padding: 15px 30px;
            font-size: 16px;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: background var(--transition);
        }
        .hamburger span {
            display: block;
            width: 18px;
            height: 2px;
            background: var(--text);
            border-radius: 1px;
            transition: all var(--transition);
        }
        .hamburger:hover {
            background: rgba(14,111,92,0.06);
        }
        /* Mobile nav panel */
        .mobile-nav-panel {
            display: none;
            position: fixed;
            top: 0;
            right: 0;
            width: 100%;
            max-width: 360px;
            height: 100vh;
            background: #fff;
            z-index: 200;
            padding: 24px;
            box-shadow: -4px 0 20px rgba(0,0,0,0.08);
            transform: translateX(100%);
            transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
        }
        .mobile-nav-panel.open {
            transform: translateX(0);
        }
        .mobile-nav-panel .close-btn {
            position: absolute;
            top: 18px;
            right: 18px;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--text-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }
        .mobile-nav-panel .close-btn:hover {
            background: rgba(14,111,92,0.06);
            color: var(--primary);
        }
        .mobile-nav-list {
            margin-top: 60px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-nav-list a {
            display: block;
            padding: 16px 12px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }
        .mobile-nav-list a:hover,
        .mobile-nav-list a.active {
            background: rgba(14,111,92,0.06);
            color: var(--primary);
        }
        .mobile-nav-panel .btn {
            width: 100%;
            margin-top: 20px;
        }
        /* ========== Category Info Header ========== */
        .category-info-header {
            background: #EDF4F1;
            padding: 48px 0 44px;
            border-bottom: 1px solid var(--border);
        }
        .category-info-header .container {
            display: flex;
            align-items: flex-start;
            gap: 32px;
        }
        .category-info-text {
            flex: 1;
        }
        .category-info-text h1 {
            font-size: clamp(28px, 3.5vw, 36px);
            line-height: 1.25;
            color: var(--primary-dark);
            font-weight: 700;
            margin: 0 0 12px;
        }
        .category-info-text .subtitle {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 680px;
            margin: 0;
        }
        .category-info-icon {
            flex-shrink: 0;
            width: 96px;
            height: 96px;
            border-radius: var(--radius-md);
            background: #fff;
            border: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-card);
        }
        .category-info-icon img {
            width: 56px;
            height: 56px;
            object-fit: cover;
            border-radius: var(--radius-sm);
        }
        /* ========== Section Common ========== */
        .section-title {
            font-size: clamp(24px, 3vw, 30px);
            line-height: 1.3;
            color: var(--text);
            font-weight: 700;
            margin: 0 0 12px;
        }
        .section-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            max-width: 720px;
            margin: 0 0 32px;
        }
        .bg-light {
            background: #FFFFFF;
        }
        .bg-gray {
            background: #F1F5F3;
        }
        /* ========== Version Card ========== */
        .version-card-wrap {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }
        .version-card-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
        }
        .version-card-info {
            padding: 36px 36px 32px;
        }
        .version-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            background: rgba(14,111,92,0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            margin-bottom: 16px;
        }
        .version-number {
            font-size: 40px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.1;
            margin-bottom: 8px;
        }
        .version-meta-list {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 24px;
            margin: 20px 0 24px;
        }
        .version-meta-item {
            display: flex;
            flex-direction: column;
            gap: 3px;
        }
        .version-meta-item .label {
            font-size: 13px;
            color: var(--text-secondary);
        }
        .version-meta-item .value {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
        }
        .version-card-media {
            min-height: 280px;
            background: #F4F7F5;
            display: flex;
            align-items: center;
            justify-content: center;
            border-left: 1px solid var(--border);
        }
        .version-card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 280px;
        }
        /* ========== Checklist ========== */
        .checklist-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .checklist-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 10px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }
        .checklist-item:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .checklist-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: rgba(47,158,110,0.12);
            color: var(--success);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
        }
        .checklist-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
        }
        .checklist-desc {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }
        /* ========== Steps ========== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 22px 22px;
            position: relative;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }
        .step-item:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .step-number {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 14px;
        }
        .step-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
        }
        .step-desc {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }
        /* ========== Table ========== */
        .compare-table-wrap {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }
        .compare-table thead {
            background: #F6F9F8;
        }
        .compare-table th {
            padding: 16px 20px;
            text-align: left;
            font-weight: 600;
            color: var(--primary-dark);
            border-bottom: 1px solid var(--border);
            white-space: nowrap;
        }
        .compare-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border);
            color: var(--text);
            vertical-align: middle;
        }
        .compare-table tr:last-child td {
            border-bottom: none;
        }
        .compare-table .pass-badge {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 4px 12px;
            background: rgba(47,158,110,0.1);
            color: var(--success);
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
        }
        .compare-table .warn-badge {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 4px 12px;
            background: rgba(217,138,43,0.1);
            color: var(--warning);
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
        }
        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 860px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item.open {
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(14,111,92,0.08);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: color var(--transition);
            gap: 16px;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-arrow {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform var(--transition);
            color: var(--text-secondary);
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            display: none;
            padding: 0 20px 18px;
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-secondary);
            background: #F9FBF9;
            border-top: 1px solid var(--border);
            padding-top: 14px;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        /* ========== Tutorial Cards ========== */
        .tutorial-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .tutorial-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .tutorial-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .tutorial-card-media {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #F4F7F5;
        }
        .tutorial-card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .tutorial-card-body {
            padding: 20px 18px 18px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .tutorial-card-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.4;
            margin: 0 0 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .tutorial-card-title a:hover {
            color: var(--primary);
        }
        .tutorial-card-summary {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0 0 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .tutorial-card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-secondary);
        }
        .tutorial-card-tag {
            display: inline-flex;
            padding: 3px 10px;
            background: rgba(14,111,92,0.08);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            border-radius: 999px;
        }
        .read-time {
            margin-left: auto;
            font-size: 12px;
        }
        /* ========== Bottom CTA ========== */
        .bottom-cta-bar {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            box-shadow: var(--shadow-card);
        }
        .bottom-cta-text h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 6px;
        }
        .bottom-cta-text p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
        }
        /* ========== Empty state ========== */
        .empty-state {
            background: #fff;
            border: 1px dashed var(--border);
            border-radius: var(--radius-md);
            padding: 40px 20px;
            text-align: center;
            color: var(--text-secondary);
            font-size: 14px;
        }
        /* ========== Footer ========== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.8);
            padding: 60px 0 0;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-brand h3 {
            font-size: 19px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
            margin: 0;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 14px;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col a {
            font-size: 14px;
            color: rgba(255,255,255,0.7);
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.12);
            padding: 18px 0 22px;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 13px;
            color: rgba(255,255,255,0.55);
            margin: 0;
        }
        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .checklist-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .tutorial-list {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .header-cta .btn-primary {
                display: none;
            }
            .mobile-nav-panel {
                display: block;
            }
            .category-info-header .container {
                flex-direction: column;
                gap: 20px;
            }
            .category-info-icon {
                width: 64px;
                height: 64px;
            }
            .category-info-icon img {
                width: 40px;
                height: 40px;
            }
            .version-card-grid {
                grid-template-columns: 1fr;
            }
            .version-card-media {
                border-left: none;
                border-top: 1px solid var(--border);
                min-height: 200px;
            }
            .version-card-media img {
                min-height: 200px;
            }
            .version-card-info {
                padding: 24px 20px 20px;
            }
            .checklist-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .compare-table-wrap {
                overflow-x: auto;
            }
            .compare-table {
                min-width: 560px;
            }
            .tutorial-list {
                grid-template-columns: 1fr;
            }
            .bottom-cta-bar {
                flex-direction: column;
                align-items: flex-start;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            :root {
                --section-padding: 48px;
                --header-height: 60px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .version-number {
                font-size: 32px;
            }
            .btn-lg {
                width: 100%;
                justify-content: center;
            }
            .category-info-text h1 {
                font-size: 26px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #0E6F5C;
            --primary-dark: #0A4D40;
            --accent: #D6A84B;
            --bg: #F6F8F7;
            --card-bg: #FFFFFF;
            --text: #1B2A26;
            --text-secondary: #5C6B66;
            --border: #DCE4E0;
            --success: #2F9E6E;
            --warning: #D98A2B;
            --error: #C34F4F;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(14,111,92,0.06);
            --shadow-card-hover: 0 12px 30px rgba(14,111,92,0.12);
            --shadow-btn-hover: 0 8px 18px rgba(14,111,92,0.18);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --container: 1200px;
            --header-height: 68px;
            --section-padding: 72px;
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            margin: 0;
            padding: 0;
        }

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

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

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

        button,
        input {
            font-family: var(--font-family);
            font-size: inherit;
            outline: none;
            border: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

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

        section {
            padding-top: var(--section-padding);
            padding-bottom: var(--section-padding);
        }

        /* ========== Header & Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #fff;
            height: var(--header-height);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition), box-shadow var(--transition);
            display: flex;
            align-items: center;
        }

        .site-header.scrolled {
            border-bottom-color: var(--border);
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }

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

        .logo {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.3px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }

        .logo:hover {
            color: var(--primary-dark);
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-menu a {
            font-size: 15px;
            color: var(--text);
            padding: 6px 0;
            position: relative;
            font-weight: 500;
            text-decoration: none;
        }

        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary);
        }

        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }

        .nav-menu a:hover::after,
        .nav-menu a.active::after {
            width: 100%;
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 22px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            transition: all var(--transition);
            white-space: nowrap;
            border: 1px solid transparent;
            text-decoration: none;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-btn-hover);
            color: #fff;
            text-decoration: none;
        }

        .btn-primary:active {
            transform: translateY(1px);
        }

        .btn-accent {
            background: var(--accent);
            color: #1B2A26;
            font-weight: 700;
        }

        .btn-accent:hover {
            background: #c99a3c;
            box-shadow: 0 8px 20px rgba(214,168,75,0.3);
            color: #1B2A26;
            text-decoration: none;
        }

        .btn-accent:active {
            transform: translateY(1px);
        }

        .btn-outline {
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-outline:hover {
            background: rgba(14,111,92,0.06);
            color: var(--primary-dark);
            text-decoration: none;
        }

        .btn-sm {
            padding: 9px 16px;
            font-size: 14px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 32px;
            height: 28px;
            justify-content: center;
            align-items: stretch;
            padding: 0;
            margin-left: 6px;
        }

        .hamburger span {
            display: block;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
            width: 100%;
        }

        /* ========== Page Info Header ========== */
        .page-header {
            background: #F0F5F2;
            padding: 40px 0 36px;
            border-bottom: 1px solid var(--border);
        }

        .page-header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
        }

        .page-header-text {
            flex: 1;
        }

        .page-header h1 {
            font-size: clamp(26px, 3.2vw, 34px);
            line-height: 1.25;
            color: var(--text);
            margin: 0 0 12px;
            font-weight: 700;
        }

        .page-header-sub {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0;
            max-width: 620px;
        }

        .page-header-visual {
            width: 200px;
            height: 110px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            background: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            flex-shrink: 0;
        }

        .page-header-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* ========== Tutorial Cards ========== */
        .tutorial-section {
            background: var(--bg);
        }

        .section-title {
            font-size: clamp(22px, 2.6vw, 28px);
            line-height: 1.3;
            color: var(--text);
            margin: 0 0 12px;
            font-weight: 700;
        }

        .section-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0 0 32px;
            max-width: 680px;
        }

        .tutorial-list {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .tutorial-card {
            display: flex;
            gap: 22px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 18px;
            transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
            text-decoration: none;
            color: inherit;
            align-items: stretch;
        }

        .tutorial-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: rgba(14,111,92,0.25);
            color: inherit;
        }

        .tutorial-card-media {
            width: 210px;
            min-width: 210px;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border);
            aspect-ratio: 16/9;
            flex-shrink: 0;
            background: #F0F5F2;
        }

        .tutorial-card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        .tutorial-card-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            gap: 8px;
            min-width: 0;
        }

        .tutorial-card-badge {
            display: inline-flex;
            align-items: center;
            background: rgba(14,111,92,0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            padding: 4px 12px;
            border-radius: 999px;
            width: fit-content;
            white-space: nowrap;
        }

        .tutorial-card-title {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.4;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .tutorial-card-summary {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .tutorial-card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .tutorial-card-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .tutorial-empty {
            background: var(--card-bg);
            border: 1px dashed var(--border);
            border-radius: var(--radius-lg);
            padding: 36px 20px;
            text-align: center;
            color: var(--text-secondary);
            font-size: 15px;
        }

        /* ========== Steps ========== */
        .steps-section {
            background: #fff;
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }

        .step-card {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            text-align: left;
            transition: box-shadow var(--transition), transform var(--transition);
            position: relative;
        }

        .step-card:hover {
            box-shadow: var(--shadow-card);
            transform: translateY(-2px);
        }

        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 14px;
        }

        .step-title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 8px;
            line-height: 1.4;
        }

        .step-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        /* ========== Scenes ========== */
        .scenes-section {
            background: #F0F5F2;
        }

        .scenes-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .scene-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .scene-item:hover {
            border-color: rgba(14,111,92,0.3);
            box-shadow: var(--shadow-card);
        }

        .scene-dot {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--accent);
            flex-shrink: 0;
            margin-top: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .scene-dot::after {
            content: '';
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #fff;
        }

        .scene-text h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 4px;
            line-height: 1.4;
        }

        .scene-text p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        /* ========== Guide Preview ========== */
        .guide-preview {
            background: #fff;
        }

        .guide-preview-inner {
            display: flex;
            align-items: center;
            gap: 36px;
        }

        .guide-preview-text {
            flex: 1;
        }

        .guide-preview-text h3 {
            font-size: 22px;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 14px;
            line-height: 1.4;
        }

        .guide-preview-text p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0 0 16px;
        }

        .guide-preview-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .guide-preview-list li {
            font-size: 15px;
            color: var(--text);
            line-height: 1.6;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }

        .guide-preview-list li::before {
            content: '✓';
            color: var(--success);
            font-weight: 700;
            flex-shrink: 0;
        }

        .guide-preview-media {
            width: 280px;
            min-width: 280px;
            aspect-ratio: 4/3;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            background: #F0F5F2;
            flex-shrink: 0;
        }

        .guide-preview-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

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

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
        }

        .faq-item.open {
            border-color: rgba(14,111,92,0.45);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            background: #fff;
            cursor: pointer;
            width: 100%;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            line-height: 1.5;
            gap: 16px;
            border: none;
            transition: background var(--transition);
        }

        .faq-question:hover {
            background: #FAFCFB;
        }

        .faq-arrow {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
        }

        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 20px 18px;
            background: #F8FBF9;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        /* ========== Update Notice ========== */
        .update-notice-section {
            background: #fff;
        }

        .update-notice {
            background: #F0F5F2;
            border: 1px solid rgba(14,111,92,0.2);
            border-radius: var(--radius-md);
            padding: 22px 26px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }

        .update-notice-text {
            flex: 1;
            min-width: 200px;
        }

        .update-notice-text h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 4px;
            line-height: 1.4;
        }

        .update-notice-text p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        /* ========== Download Entry ========== */
        .download-entry-section {
            background: var(--bg);
            text-align: center;
        }

        .download-entry-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.85);
            padding: 56px 0 0;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255,255,255,0.12);
        }

        .footer-brand h3 {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
            line-height: 1.4;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255,255,255,0.72);
            margin: 0;
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 14px;
            line-height: 1.4;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col a {
            font-size: 14px;
            color: rgba(255,255,255,0.72);
            text-decoration: none;
            transition: color var(--transition);
        }

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

        .footer-bottom {
            padding: 18px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.6);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            :root {
                --section-padding: 56px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .page-header-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .page-header-visual {
                width: 160px;
                height: 90px;
            }
            .tutorial-card-media {
                width: 160px;
                min-width: 160px;
            }
            .guide-preview-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .guide-preview-media {
                width: 100%;
                min-width: auto;
                aspect-ratio: 16/9;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: 48px;
                --header-height: 60px;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .hamburger {
                display: flex;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                list-style: none;
                padding: 12px 16px;
                gap: 0;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 6px 16px rgba(0,0,0,0.08);
                z-index: 99;
                margin: 0;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li {
                width: 100%;
            }
            .nav-menu a {
                display: block;
                padding: 14px 0;
                font-size: 16px;
                border-bottom: 1px solid #F0F5F2;
                text-decoration: none;
            }
            .nav-menu a::after {
                display: none;
            }
            .nav-menu li:last-child a {
                border-bottom: none;
            }
            .header-cta .btn {
                display: none;
            }
            .page-header {
                padding: 28px 0 24px;
            }
            .page-header h1 {
                font-size: 22px;
            }
            .page-header-sub {
                font-size: 14px;
            }
            .page-header-visual {
                width: 100%;
                max-width: 300px;
                height: 100px;
            }
            .tutorial-card {
                flex-direction: column;
                padding: 14px;
                gap: 14px;
            }
            .tutorial-card-media {
                width: 100%;
                min-width: auto;
                aspect-ratio: 16/9;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .scenes-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .guide-preview-inner {
                flex-direction: column;
                gap: 20px;
            }
            .guide-preview-media {
                width: 100%;
                min-width: auto;
            }
            .update-notice {
                flex-direction: column;
                align-items: flex-start;
                padding: 18px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .download-entry-buttons {
                flex-direction: column;
                align-items: stretch;
            }
            .download-entry-buttons .btn {
                width: 100%;
            }
        }

        @media (max-width: 480px) {
            .page-header h1 {
                font-size: 20px;
            }
            .section-title {
                font-size: 20px;
            }
            .tutorial-card-title {
                font-size: 16px;
            }
            .tutorial-card-summary {
                font-size: 13px;
            }
            .faq-question {
                font-size: 14px;
                padding: 14px 16px;
            }
            .faq-answer {
                font-size: 14px;
                padding: 0 16px 14px;
            }
            .step-title {
                font-size: 15px;
            }
            .step-desc {
                font-size: 13px;
            }
            .scene-text h3 {
                font-size: 15px;
            }
            .scene-text p {
                font-size: 13px;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #0E6F5C;
            --primary-dark: #0A4D40;
            --accent: #D6A84B;
            --bg: #F6F8F7;
            --card-bg: #FFFFFF;
            --text: #1B2A26;
            --text-secondary: #5C6B66;
            --border: #DCE4E0;
            --success: #2F9E6E;
            --warning: #D98A2B;
            --error: #C34F4F;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-btn: 10px;
            --shadow-card: 0 4px 12px rgba(14,111,92,0.06);
            --shadow-card-hover: 0 12px 30px rgba(14,111,92,0.12);
            --shadow-btn-hover: 0 8px 18px rgba(14,111,92,0.18);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --container: 1200px;
            --header-height: 68px;
            --section-padding: 72px;
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-family);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            margin: 0;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition), opacity var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: var(--font-family);
            font-size: inherit;
            outline: none;
            border: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        section {
            padding-top: var(--section-padding);
            padding-bottom: var(--section-padding);
        }
        .section-header {
            margin-bottom: 32px;
        }
        .section-title {
            font-size: clamp(24px, 3vw, 30px);
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
            max-width: 720px;
            margin: 0 auto;
        }
        .bg-white {
            background: #fff;
        }
        .bg-light {
            background: #F1F6F4;
        }
        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #fff;
            height: var(--header-height);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            border-bottom-color: var(--border);
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.3px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-menu a {
            font-size: 15px;
            color: var(--text);
            padding: 6px 0;
            position: relative;
            font-weight: 500;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary);
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-menu a:hover::after,
        .nav-menu a.active::after {
            width: 100%;
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 22px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            transition: all var(--transition);
            white-space: nowrap;
            border: 1px solid transparent;
            text-align: center;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-btn-hover);
            color: #fff;
        }
        .btn-primary:active {
            transform: translateY(1px);
        }
        .btn-accent {
            background: var(--accent);
            color: #1B2A26;
            font-weight: 700;
        }
        .btn-accent:hover {
            background: #c99a3c;
            box-shadow: 0 8px 20px rgba(214,168,75,0.3);
            color: #1B2A26;
        }
        .btn-accent:active {
            transform: translateY(1px);
        }
        .btn-outline {
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
        }
        .btn-outline:hover {
            background: rgba(14,111,92,0.06);
            color: var(--primary-dark);
        }
        .btn-sm {
            padding: 9px 16px;
            font-size: 14px;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            width: 44px;
            height: 44px;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--primary-dark);
            transition: all var(--transition);
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        /* Page specific */
        .category-hero {
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 40px 0 36px;
        }
        .category-hero-inner {
            display: flex;
            align-items: center;
            gap: 32px;
            flex-wrap: wrap;
        }
        .category-hero-text {
            flex: 1 1 60%;
            min-width: 280px;
        }
        .category-hero-text h1 {
            font-size: clamp(28px, 4vw, 38px);
            line-height: 1.2;
            color: var(--text);
            margin-bottom: 12px;
            font-weight: 700;
        }
        .category-hero-text p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
            max-width: 600px;
            margin: 0;
        }
        .category-hero-image {
            flex: 0 0 240px;
            max-width: 240px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
        }
        .category-hero-image img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            display: block;
        }
        /* Timeline */
        .timeline {
            position: relative;
            padding-left: 32px;
            margin-top: 24px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 12px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 28px;
        }
        .timeline-item:last-child {
            margin-bottom: 0;
        }
        .timeline-dot {
            position: absolute;
            left: -26px;
            top: 6px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
            border: 2px solid #fff;
            box-shadow: 0 0 0 2px var(--primary);
        }
        .timeline-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }
        .timeline-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary);
        }
        .timeline-version {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 6px;
        }
        .timeline-date {
            font-size: 13px;
            color: var(--text-secondary);
            display: block;
            margin-bottom: 10px;
        }
        .timeline-updates {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .timeline-updates li {
            position: relative;
            padding-left: 20px;
            margin-bottom: 6px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .timeline-updates li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--success);
            font-weight: 700;
        }
        .timeline-size {
            display: inline-block;
            background: #E8F2F0;
            color: var(--primary);
            padding: 4px 10px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            margin-top: 8px;
        }
        /* Version table */
        .version-table-wrap {
            overflow-x: auto;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            background: #fff;
            box-shadow: var(--shadow-card);
        }
        .version-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
        }
        .version-table th,
        .version-table td {
            padding: 16px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border);
            font-size: 14px;
            color: var(--text);
        }
        .version-table th {
            background: #F1F6F4;
            font-weight: 600;
            color: var(--primary-dark);
            border-bottom: 1px solid var(--border);
        }
        .version-table tr:last-child td {
            border-bottom: none;
        }
        .version-table .download-link {
            color: var(--primary);
            font-weight: 600;
        }
        .version-table .download-link:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        /* Update log cards */
        .update-log-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 16px;
        }
        .update-log-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }
        .update-log-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .update-log-card .version {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary-dark);
        }
        .update-log-card .date {
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 10px;
        }
        .update-log-card ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .update-log-card ul li {
            font-size: 13px;
            color: var(--text-secondary);
            padding-left: 16px;
            position: relative;
            margin-bottom: 6px;
        }
        .update-log-card ul li::before {
            content: '•';
            position: absolute;
            left: 0;
            color: var(--accent);
        }
        /* Subscribe form */
        .subscribe-section {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
        }
        .subscribe-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
        }
        .subscribe-form input[type="email"],
        .subscribe-form input[type="text"] {
            flex: 1 1 260px;
            min-width: 200px;
            height: 48px;
            padding: 0 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius-btn);
            font-size: 15px;
            background: #fff;
            color: var(--text);
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .subscribe-form input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(14,111,92,0.1);
        }
        .subscribe-form .btn {
            height: 48px;
            min-width: 140px;
        }
        .subscribe-note {
            text-align: center;
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 12px;
        }
        /* Warning notice */
        .compatibility-notice {
            background: #FFF6E6;
            border-left: 4px solid var(--warning);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            margin-top: 16px;
        }
        .compatibility-notice h3 {
            font-size: 16px;
            font-weight: 700;
            color: #8a5a00;
            margin-bottom: 10px;
        }
        .compatibility-notice ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .compatibility-notice li {
            position: relative;
            padding-left: 22px;
            margin-bottom: 6px;
            font-size: 14px;
            color: #6b4a00;
        }
        .compatibility-notice li::before {
            content: '!';
            position: absolute;
            left: 0;
            top: 0;
            color: var(--warning);
            font-weight: 700;
            font-size: 16px;
        }
        /* FAQ */
        .faq-list {
            margin-top: 16px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item.active {
            border-color: var(--primary);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            font-weight: 600;
            font-size: 15px;
            color: var(--text);
            cursor: pointer;
            background: #fff;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question .arrow {
            transition: transform var(--transition);
            flex-shrink: 0;
            margin-left: 16px;
            color: var(--primary);
        }
        .faq-item.active .faq-question .arrow {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background: #F8FBFA;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 14px;
            line-height: 1.8;
            color: var(--text-secondary);
        }
        /* CTA */
        .cta-bar {
            background: var(--primary-dark);
            border-radius: var(--radius-lg);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .cta-bar-text {
            color: #fff;
            font-size: 18px;
            font-weight: 600;
        }
        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.85);
            margin-top: auto;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding: 48px 0 32px;
        }
        .site-footer h3,
        .site-footer h4 {
            color: #fff;
            font-weight: 600;
        }
        .site-footer h3 {
            font-size: 18px;
            margin-bottom: 12px;
        }
        .site-footer h4 {
            font-size: 15px;
            margin-bottom: 12px;
        }
        .site-footer p {
            font-size: 13px;
            line-height: 1.7;
            margin: 0;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 8px;
        }
        .site-footer ul li a {
            color: rgba(255,255,255,0.8);
            font-size: 13px;
            transition: color var(--transition);
        }
        .site-footer ul li a:hover {
            color: #fff;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.15);
            padding: 16px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.7);
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .update-log-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-padding: 48px;
                --header-height: 60px;
            }
            .nav-menu {
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                gap: 0;
                padding: 16px 24px;
                box-shadow: 0 8px 20px rgba(0,0,0,0.08);
                display: none;
                align-items: stretch;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li {
                width: 100%;
            }
            .nav-menu a {
                display: block;
                padding: 12px 0;
                font-size: 16px;
                border-bottom: 1px solid var(--border);
            }
            .nav-menu a::after {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .category-hero-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .category-hero-image {
                flex: 0 0 auto;
                max-width: 100%;
                width: 100%;
            }
            .category-hero-image img {
                height: auto;
                max-height: 200px;
            }
            .timeline {
                padding-left: 24px;
            }
            .timeline::before {
                left: 8px;
            }
            .timeline-dot {
                left: -22px;
            }
            .update-log-grid {
                grid-template-columns: 1fr;
            }
            .subscribe-form {
                flex-direction: column;
            }
            .subscribe-form input[type="email"],
            .subscribe-form input[type="text"] {
                width: 100%;
                flex: 1 1 auto;
            }
            .cta-bar {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .btn-sm {
                width: auto;
            }
            .section-title {
                font-size: 22px;
            }
            .category-hero-text h1 {
                font-size: 26px;
            }
            .version-table th,
            .version-table td {
                padding: 10px 12px;
                font-size: 13px;
            }
            .update-log-card {
                padding: 14px;
            }
        }