/* roulang page: index */
:root {
            --primary: #F5B301;
            --primary-50: #FEF8E6;
            --primary-100: #FCEFC2;
            --primary-200: #FAE39A;
            --primary-300: #F8D56E;
            --primary-400: #F6C442;
            --primary-500: #F5B301;
            --primary-600: #D99A00;
            --primary-700: #B58000;
            --dark: #25252B;
            --darker: #1B1B1F;
            --bg-warm: #F8F7F2;
            --card-white: #FFFFFF;
            --accent-red: #D91E4A;
            --accent-green: #2E9E6B;
            --text-primary: #1B1B1F;
            --text-secondary: #5E5E66;
            --text-muted: #8A8A92;
            --border-color: #E8E5DC;
            --radius-sm: 8px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-card: 0 2px 12px rgba(27, 27, 31, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(27, 27, 31, 0.10);
            --shadow-nav: 0 4px 16px rgba(27, 27, 31, 0.05);
            --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-title: 'HarmonyOS Sans SC', 'MiSans', 'Alibaba PuHuiTi 3.0', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-mono: 'DIN Alternate', 'Roboto Mono', 'SFMono-Regular', 'Consolas', monospace;
            --transition-base: 0.25s ease;
            --transition-fast: 0.15s ease;
            --container-width: 1200px;
            --nav-height: 68px;
        }

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

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

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }

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

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

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

        :focus-visible {
            outline: 2px solid rgba(245, 179, 1, 0.65);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: rgba(248, 247, 242, 0.92);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            -webkit-backdrop-filter: none;
            backdrop-filter: none;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-title);
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, #F5B301, #FFD44A);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: var(--darker);
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(245, 179, 1, 0.35);
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
        }
        .nav-desktop li {
            position: relative;
        }
        .nav-desktop a {
            display: block;
            padding: 22px 14px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            white-space: nowrap;
        }
        .nav-desktop a:hover {
            color: var(--primary-600);
        }
        .nav-desktop a.active {
            color: var(--darker);
            font-weight: 700;
        }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 12px;
            left: 14px;
            right: 14px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }
        .nav-cta {
            flex-shrink: 0;
        }
        .nav-cta .btn-primary {
            padding: 10px 20px;
            font-size: 15px;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            z-index: 1100;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 3px;
            border-radius: 2px;
            background: var(--darker);
            transition: transform var(--transition-base), opacity var(--transition-base);
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* Mobile drawer */
        .mobile-drawer {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--darker);
            z-index: 990;
            padding: 24px 20px;
            overflow-y: auto;
        }
        .mobile-drawer.open {
            display: block;
        }
        .mobile-drawer nav ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-drawer nav a {
            display: block;
            padding: 14px 16px;
            font-size: 18px;
            font-weight: 500;
            color: #FFFFFF;
            border-radius: 10px;
            transition: background var(--transition-fast), color var(--transition-fast);
        }
        .mobile-drawer nav a:hover {
            background: rgba(245, 179, 1, 0.15);
            color: var(--primary);
        }
        .mobile-drawer nav a.active {
            color: var(--primary);
            font-weight: 700;
        }
        .mobile-drawer .drawer-cta {
            margin-top: 16px;
        }
        .mobile-drawer .drawer-cta .btn-primary {
            display: block;
            width: 100%;
            text-align: center;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 22px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 16px;
            transition: all var(--transition-base);
            white-space: nowrap;
            text-align: center;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--darker);
            border: 1px solid var(--primary);
        }
        .btn-primary:hover {
            background: #FFC933;
            border-color: #FFC933;
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(245, 179, 1, 0.45);
        }
        .btn-primary:active {
            background: var(--primary-600);
            border-color: var(--primary-600);
            transform: translateY(0);
            box-shadow: none;
        }
        .btn-secondary {
            background: transparent;
            color: var(--darker);
            border: 1px solid var(--darker);
        }
        .btn-secondary:hover {
            background: rgba(37, 37, 43, 0.06);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            background: rgba(37, 37, 43, 0.12);
            transform: translateY(0);
        }
        .btn-red {
            background: var(--accent-red);
            color: #fff;
            border: 1px solid var(--accent-red);
        }
        .btn-red:hover {
            background: #E62B5D;
            border-color: #E62B5D;
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(217, 30, 74, 0.4);
        }
        .btn-sm {
            padding: 8px 14px;
            font-size: 14px;
            border-radius: 8px;
        }
        .btn-lg {
            padding: 14px 28px;
            font-size: 17px;
            border-radius: 12px;
        }

        /* ===== Main ===== */
        main {
            flex: 1;
            padding-top: var(--nav-height);
        }

        /* ===== Announcement Bar ===== */
        .announcement-bar {
            background: var(--primary-50);
            border-bottom: 1px solid var(--primary-100);
            padding: 10px 0;
        }
        .announcement-bar .container {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        .announcement-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent-red);
            flex-shrink: 0;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.4; }
        }
        .announcement-bar p {
            font-size: 14px;
            color: var(--text-primary);
            font-weight: 500;
        }
        .announcement-bar a {
            color: var(--accent-red);
            font-weight: 600;
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .announcement-close {
            font-size: 18px;
            color: var(--text-secondary);
            margin-left: 8px;
            padding: 4px;
            line-height: 1;
            transition: color var(--transition-fast);
        }
        .announcement-close:hover {
            color: var(--text-primary);
        }

        /* ===== Hero ===== */
        .hero {
            background: var(--bg-warm);
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .hero .container {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        .hero-content {
            flex: 0 0 55%;
            max-width: 55%;
        }
        .hero-content .hero-tag {
            display: inline-block;
            background: var(--primary-100);
            color: var(--primary-700);
            font-size: 13px;
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 20px;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .hero-content h1 {
            font-family: var(--font-title);
            font-size: clamp(32px, 5vw, 48px);
            font-weight: 700;
            line-height: 1.25;
            color: var(--darker);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .hero-content .hero-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 24px;
            max-width: 520px;
        }
        .hero-buttons {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 14px;
        }
        .hero-note {
            font-size: 14px;
            color: var(--text-muted);
        }
        .hero-visual {
            flex: 0 0 45%;
            max-width: 45%;
            display: flex;
            justify-content: center;
        }
        .hero-mockup {
            width: 100%;
            max-width: 460px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            background: var(--card-white);
            box-shadow: 0 12px 32px rgba(27, 27, 31, 0.12);
            overflow: hidden;
            transition: transform var(--transition-base), box-shadow var(--transition-base);
        }
        .hero-mockup:hover {
            transform: translateY(-4px);
            box-shadow: 0 18px 44px rgba(27, 27, 31, 0.16);
        }
        .mockup-topbar {
            display: flex;
            align-items: center;
            padding: 12px 16px;
            border-bottom: 1px solid var(--border-color);
            background: #FAF9F5;
            gap: 6px;
        }
        .mockup-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
        }
        .mockup-dot.red { background: #FF5F57; }
        .mockup-dot.yellow { background: #F5B301; }
        .mockup-dot.green { background: #2E9E6B; }
        .mockup-topbar .mockup-version {
            margin-left: auto;
            font-size: 12px;
            font-family: var(--font-mono);
            color: var(--text-muted);
        }
        .mockup-img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            display: block;
        }
        .mockup-footer {
            padding: 12px 16px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-top: 1px solid var(--border-color);
        }
        .mockup-footer span {
            font-size: 13px;
            color: var(--text-secondary);
        }
        .mockup-footer .badge-green {
            background: var(--accent-green);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 3px 8px;
            border-radius: 4px;
        }

        /* ===== Sections ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--card-white);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .section-dark {
            background: var(--darker);
            color: #fff;
        }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }
        .section-header h2 {
            font-family: var(--font-title);
            font-size: clamp(24px, 3.5vw, 32px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--darker);
            margin-bottom: 12px;
        }
        .section-dark .section-header h2 {
            color: #fff;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .section-dark .section-header p {
            color: #B9B9C0;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-300);
            transform: translateY(-2px);
        }
        .stat-number {
            display: block;
            font-family: var(--font-mono);
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-600);
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ===== Category Entrance ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .category-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            display: flex;
            align-items: center;
            gap: 20px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }
        .category-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary);
            transform: translateY(-2px);
        }
        .category-card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: var(--primary-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            flex-shrink: 0;
        }
        .category-card-body {
            flex: 1;
        }
        .category-card-body h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 4px;
        }
        .category-card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.5;
        }
        .category-card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-600);
            white-space: nowrap;
            transition: color var(--transition-fast), transform var(--transition-fast);
        }
        .category-card:hover .category-card-link {
            color: var(--primary-700);
            transform: translateX(3px);
        }

        /* ===== Features ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .feature-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 26px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-300);
            transform: translateY(-2px);
        }
        .feature-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--primary-50);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 12px;
        }
        .feature-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 6px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Version Compare ===== */
        .versions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            align-items: stretch;
        }
        .version-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
            transition: all var(--transition-base);
            position: relative;
        }
        .version-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .version-card.highlight {
            border-color: var(--primary);
            box-shadow: 0 6px 24px rgba(245, 179, 1, 0.18);
        }
        .version-card .badge-recommend {
            position: absolute;
            top: -12px;
            right: 16px;
            background: var(--primary);
            color: var(--darker);
            font-size: 12px;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 6px;
        }
        .version-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 4px;
        }
        .version-card .version-num {
            font-family: var(--font-mono);
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }
        .version-card ul {
            list-style: none;
            margin-bottom: 20px;
            flex: 1;
        }
        .version-card ul li {
            padding: 6px 0;
            padding-left: 20px;
            position: relative;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .version-card ul li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 6px;
            color: var(--accent-green);
            font-weight: 700;
            font-size: 13px;
        }
        .version-card .btn {
            width: 100%;
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .step-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 26px;
            box-shadow: var(--shadow-card);
            position: relative;
            transition: all var(--transition-base);
        }
        .step-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-300);
            transform: translateY(-2px);
        }
        .step-num {
            font-family: var(--font-mono);
            font-size: 14px;
            font-weight: 700;
            color: var(--primary);
            display: block;
            margin-bottom: 8px;
        }
        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 6px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Screenshots ===== */
        .screenshots-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .screenshot-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 12px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }
        .screenshot-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-300);
            transform: translateY(-2px);
        }
        .screenshot-card img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            border-radius: 8px;
            margin-bottom: 10px;
        }
        .screenshot-card p {
            font-size: 13px;
            color: var(--text-secondary);
            text-align: center;
        }

        /* ===== Compatible ===== */
        .compat-list {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }
        .compat-badge {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: 30px;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .compat-badge:hover {
            border-color: var(--primary);
            color: var(--primary-700);
            transform: translateY(-1px);
            box-shadow: var(--shadow-card-hover);
        }

        /* ===== News / CMS ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-bottom: 20px;
        }
        .news-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-300);
            transform: translateY(-2px);
        }
        .news-card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
            border-bottom: 1px solid var(--border-color);
            transition: transform var(--transition-base);
        }
        .news-card:hover .news-card-img {
            transform: scale(1.02);
        }
        .news-card-body {
            padding: 16px 18px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--darker);
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .news-card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 10px;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-meta {
            font-size: 12px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .news-meta .news-cat {
            background: var(--primary-100);
            color: var(--primary-700);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 600;
            font-size: 12px;
        }
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            font-size: 15px;
            color: var(--text-muted);
            border: 1px dashed var(--border-color);
            border-radius: var(--radius-lg);
            background: var(--card-white);
        }

        /* ===== Testimonials ===== */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .testimonial-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 22px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .testimonial-card .user-row {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
        }
        .user-avatar {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--primary-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            color: var(--primary-700);
            flex-shrink: 0;
        }
        .user-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--darker);
        }
        .user-version {
            font-size: 12px;
            color: var(--text-muted);
            font-family: var(--font-mono);
        }
        .testimonial-card blockquote {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            font-style: normal;
        }

        /* ===== Security ===== */
        .security-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .security-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 22px;
            box-shadow: var(--shadow-card);
            text-align: center;
            transition: all var(--transition-base);
        }
        .security-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--accent-green);
            transform: translateY(-2px);
        }
        .security-icon {
            font-size: 28px;
            margin-bottom: 8px;
        }
        .security-card h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 4px;
        }
        .security-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            max-width: 840px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--card-white);
            transition: all var(--transition-base);
        }
        .faq-item.active {
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(245, 179, 1, 0.12);
        }
        .faq-question {
            width: 100%;
            padding: 16px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 16px;
            font-weight: 600;
            color: var(--darker);
            text-align: left;
            transition: background var(--transition-fast);
        }
        .faq-question:hover {
            background: #FAF9F5;
        }
        .faq-arrow {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base) ease;
        }
        .faq-answer-inner {
            padding: 0 20px 16px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            border-left: 3px solid var(--primary);
            margin-left: 20px;
            padding-left: 16px;
            background: #FAF9F5;
        }
        .faq-item.active .faq-answer {
            max-height: 500px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--darker);
            padding: 80px 0;
            text-align: center;
        }
        .cta-section h2 {
            font-family: var(--font-title);
            font-size: clamp(24px, 3.5vw, 32px);
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 16px;
            color: #B9B9C0;
            max-width: 600px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .cta-buttons {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .cta-section .btn-secondary {
            border-color: #fff;
            color: #fff;
        }
        .cta-section .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* ===== Newsletter ===== */
        .newsletter-section {
            background: var(--bg-warm);
            padding: 60px 0;
        }
        .newsletter-box {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            display: flex;
            align-items: center;
            gap: 24px;
            box-shadow: var(--shadow-card);
        }
        .newsletter-box .newsletter-text {
            flex: 1;
        }
        .newsletter-box .newsletter-text h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 4px;
        }
        .newsletter-box .newsletter-text p {
            font-size: 14px;
            color: var(--text-secondary);
        }
        .newsletter-form {
            display: flex;
            gap: 8px;
            flex: 0 0 400px;
            max-width: 400px;
        }
        .newsletter-form input[type="email"] {
            flex: 1;
            height: 48px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 0 16px;
            font-size: 15px;
            background: #fff;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .newsletter-form input[type="email"]:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(245, 179, 1, 0.15);
        }
        .newsletter-form .btn {
            height: 48px;
            padding: 0 20px;
            flex-shrink: 0;
        }
        .form-error {
            font-size: 12px;
            color: var(--accent-red);
            margin-top: 4px;
            display: none;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--darker);
            color: #B9B9C0;
            padding: 56px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            margin-bottom: 36px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: #B9B9C0;
            transition: color var(--transition-fast);
        }
        .footer-col ul a:hover {
            color: var(--primary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
        }
        .footer-bottom p {
            font-size: 13px;
            color: #8A8A92;
        }
        .footer-bottom a {
            color: #8A8A92;
            transition: color var(--transition-fast);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1200px) {
            .features-grid,
            .versions-grid,
            .steps-grid,
            .screenshots-grid,
            .testimonials-grid,
            .news-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .security-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 992px) {
            .nav-desktop {
                display: none;
            }
            .nav-cta {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .hero .container {
                flex-direction: column;
                gap: 32px;
            }
            .hero-content {
                flex: 1;
                max-width: 100%;
                text-align: center;
            }
            .hero-content .hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-visual {
                flex: 1;
                max-width: 100%;
                width: 100%;
            }
            .hero-mockup {
                max-width: 480px;
                margin: 0 auto;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .features-grid,
            .versions-grid,
            .steps-grid,
            .screenshots-grid,
            .testimonials-grid,
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .security-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .newsletter-box {
                flex-direction: column;
                text-align: center;
            }
            .newsletter-form {
                flex: 1;
                max-width: 100%;
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .features-grid,
            .versions-grid,
            .steps-grid,
            .screenshots-grid,
            .testimonials-grid,
            .news-grid {
                grid-template-columns: 1fr;
            }
            .section {
                padding: 48px 0;
            }
            .hero {
                padding: 48px 0;
            }
            .cta-section {
                padding: 48px 0;
            }
            .newsletter-section {
                padding: 36px 0;
            }
            .newsletter-box {
                padding: 24px 18px;
            }
            .newsletter-form {
                flex-direction: column;
            }
            .newsletter-form .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .version-card .btn {
                width: 100%;
            }
            .announcement-bar p {
                font-size: 12px;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .hero-content h1 {
                font-size: 28px;
            }
            .hero-content .hero-subtitle {
                font-size: 15px;
            }
            body {
                font-size: 15px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 18px 14px;
            }
            .stat-number {
                font-size: 22px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-buttons {
                flex-direction: column;
                width: 100%;
            }
            .hero-buttons .btn {
                width: 100%;
            }
            .category-card {
                flex-direction: column;
                text-align: center;
                align-items: center;
            }
            .category-card-link {
                margin-top: 4px;
            }
            .cta-buttons {
                flex-direction: column;
                width: 100%;
            }
            .cta-buttons .btn {
                width: 100%;
            }
            .faq-question {
                font-size: 15px;
                padding: 14px 16px;
            }
        }

/* roulang page: article */
:root {
            --primary: #F5B301;
            --primary-50: #FEF8E6;
            --primary-100: #FCEFC2;
            --primary-200: #FAE39A;
            --primary-300: #F8D56E;
            --primary-400: #F6C442;
            --primary-500: #F5B301;
            --primary-600: #D99A00;
            --primary-700: #B58000;
            --dark: #25252B;
            --darker: #1B1B1F;
            --bg-warm: #F8F7F2;
            --card-white: #FFFFFF;
            --accent-red: #D91E4A;
            --accent-green: #2E9E6B;
            --text-primary: #1B1B1F;
            --text-secondary: #5E5E66;
            --text-muted: #8A8A92;
            --border-color: #E8E5DC;
            --radius-sm: 8px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-card: 0 2px 12px rgba(27, 27, 31, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(27, 27, 31, 0.10);
            --shadow-nav: 0 4px 16px rgba(27, 27, 31, 0.05);
            --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-title: 'HarmonyOS Sans SC', 'MiSans', 'Alibaba PuHuiTi 3.0', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-mono: 'DIN Alternate', 'Roboto Mono', 'SFMono-Regular', 'Consolas', monospace;
            --transition-base: 0.25s ease;
            --transition-fast: 0.15s ease;
            --container-width: 1200px;
            --nav-height: 68px;
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-warm);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            padding-top: var(--nav-height);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }

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

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

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

        ul, ol {
            list-style: none;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: rgba(248, 247, 242, 0.92);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            box-shadow: var(--shadow-nav);
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-title);
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, #F5B301, #FFD44A);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: var(--darker);
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(245, 179, 1, 0.35);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
        }

        .nav-desktop li {
            position: relative;
        }

        .nav-desktop a {
            display: block;
            padding: 22px 14px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            white-space: nowrap;
        }

        .nav-desktop a:hover {
            color: var(--primary-600);
        }

        .nav-desktop a.active {
            color: var(--darker);
            font-weight: 700;
        }

        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 12px;
            left: 14px;
            right: 14px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }

        .nav-cta {
            flex-shrink: 0;
        }

        .nav-cta .btn-primary {
            padding: 10px 20px;
            font-size: 15px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            z-index: 1100;
        }

        .hamburger span {
            display: block;
            width: 24px;
            height: 3px;
            border-radius: 2px;
            background: var(--darker);
            transition: transform var(--transition-fast), opacity var(--transition-fast);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-md);
            font-weight: 600;
            padding: 12px 22px;
            font-size: 16px;
            transition: all var(--transition-base);
            border: 2px solid transparent;
            line-height: 1.2;
            text-align: center;
        }

        .btn:focus-visible {
            outline: none;
            box-shadow: 0 0 0 3px rgba(245, 179, 1, 0.35);
        }

        .btn-primary {
            background: var(--primary);
            color: var(--darker);
            border-color: var(--primary);
        }

        .btn-primary:hover {
            background: var(--primary-400);
            border-color: var(--primary-400);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(245, 179, 1, 0.35);
            color: var(--darker);
        }

        .btn-primary:active {
            background: var(--primary-600);
            border-color: var(--primary-600);
            transform: translateY(0);
        }

        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            border-color: var(--border-color);
        }

        .btn-secondary:hover {
            background: rgba(27, 27, 31, 0.06);
            border-color: var(--text-secondary);
            transform: translateY(-1px);
            color: var(--text-primary);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
            border-radius: var(--radius-sm);
        }

        .btn-lg {
            padding: 14px 28px;
            font-size: 17px;
        }

        /* ===== Badges & Tags ===== */
        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            background: var(--primary-50);
            color: var(--primary-700);
            border: 1px solid var(--primary-100);
            line-height: 1.4;
        }

        .badge-tag--green {
            background: rgba(46, 158, 107, 0.08);
            color: var(--accent-green);
            border-color: rgba(46, 158, 107, 0.2);
        }

        .badge-tag--red {
            background: rgba(217, 30, 74, 0.08);
            color: var(--accent-red);
            border-color: rgba(217, 30, 74, 0.2);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-section {
            padding: 28px 0 0;
            background: var(--bg-warm);
        }

        .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);
            transition: color var(--transition-fast);
        }

        .breadcrumb-nav a:hover {
            color: var(--primary-600);
        }

        .breadcrumb-nav span {
            color: var(--text-muted);
        }

        .breadcrumb-nav .current {
            color: var(--text-primary);
            font-weight: 500;
            max-width: 260px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        /* ===== Article Layout ===== */
        .article-main {
            padding: 32px 0 80px;
            background: var(--bg-warm);
            flex: 1;
        }

        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 320px;
            gap: 36px;
            align-items: start;
        }

        .article-body-col {
            min-width: 0;
        }

        /* ===== Article Head ===== */
        .article-head {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px 32px 28px;
            box-shadow: var(--shadow-card);
            margin-bottom: 24px;
        }

        .article-head h1 {
            font-family: var(--font-title);
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px 20px;
            font-size: 14px;
            color: var(--text-secondary);
        }

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

        .article-meta-item .dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--primary);
            display: inline-block;
        }

        /* ===== Article Content ===== */
        .article-content {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px 36px;
            box-shadow: var(--shadow-card);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-primary);
            word-wrap: break-word;
        }

        .article-content h2 {
            font-family: var(--font-title);
            font-size: clamp(20px, 2.5vw, 26px);
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-primary);
            margin: 32px 0 16px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }

        .article-content h3 {
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 600;
            line-height: 1.4;
            color: var(--text-primary);
            margin: 24px 0 12px;
        }

        .article-content p {
            margin-bottom: 1.2em;
            color: var(--text-primary);
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 1.2em 1.5em;
            padding-left: 0;
        }

        .article-content ul {
            list-style: disc;
        }

        .article-content ol {
            list-style: decimal;
        }

        .article-content li {
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .article-content blockquote {
            border-left: 3px solid var(--primary);
            background: var(--primary-50);
            padding: 16px 20px;
            margin: 20px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-size: 15px;
        }

        .article-content code {
            font-family: var(--font-mono);
            font-size: 14px;
            background: #F1F0EB;
            padding: 2px 6px;
            border-radius: 4px;
            color: var(--darker);
        }

        .article-content pre {
            background: var(--darker);
            color: #E8E5DC;
            padding: 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 20px 0;
            font-size: 14px;
            line-height: 1.6;
        }

        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
            font-size: 14px;
        }

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

        .article-content a {
            color: var(--primary-600);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-content a:hover {
            color: var(--primary-700);
        }

        /* ===== Article Tags ===== */
        .article-tags {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 20px 24px;
            margin-bottom: 24px;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
        }

        .article-tags__label {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-right: 4px;
        }

        /* ===== Related Articles ===== */
        .related-section {
            margin-bottom: 24px;
        }

        .related-section__title {
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .related-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        .related-card__img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background: #EFEDE6;
        }

        .related-card__body {
            padding: 14px 16px 16px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .related-card__title {
            font-size: 15px;
            font-weight: 600;
            line-height: 1.4;
            color: var(--text-primary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card__meta {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: auto;
        }

        /* ===== Back Button ===== */
        .article-back {
            margin-bottom: 24px;
        }

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

        .sidebar-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 20px 22px;
            box-shadow: var(--shadow-card);
        }

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

        .sidebar-post-list {
            display: flex;
            flex-direction: column;
        }

        .sidebar-post-item {
            display: block;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            transition: color var(--transition-fast);
        }

        .sidebar-post-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .sidebar-post-item:hover {
            color: var(--primary-600);
        }

        .sidebar-post-item__title {
            font-size: 14px;
            font-weight: 500;
            line-height: 1.45;
            color: var(--text-primary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 4px;
        }

        .sidebar-post-item:hover .sidebar-post-item__title {
            color: var(--primary-600);
        }

        .sidebar-post-item__date {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* ===== Empty State ===== */
        .empty-state {
            text-align: center;
            padding: 60px 24px;
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
        }

        .empty-state p {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 20px;
        }

        /* ===== Article CTA ===== */
        .article-cta {
            background: var(--darker);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            color: #fff;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            margin-bottom: 24px;
        }

        .article-cta__content h2 {
            font-family: var(--font-title);
            font-size: clamp(20px, 2.5vw, 28px);
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }

        .article-cta__content p {
            color: #B9B9C0;
            font-size: 15px;
            margin-bottom: 0;
        }

        .article-cta__actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--darker);
            color: #B9B9C0;
            padding: 56px 0 24px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            margin-bottom: 40px;
        }

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

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col a {
            color: #B9B9C0;
            font-size: 14px;
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 13px;
        }

        .footer-bottom a {
            color: #B9B9C0;
        }

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

        /* ===== Responsive ===== */
        @media (max-width: 1200px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-layout {
                grid-template-columns: minmax(0, 1fr) 280px;
                gap: 28px;
            }
        }

        @media (max-width: 992px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                position: static;
                flex-direction: column;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .nav-cta {
                display: none;
            }
            .article-content {
                padding: 32px 24px;
            }
            .article-head {
                padding: 24px 20px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            .article-main {
                padding: 20px 0 48px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .article-head h1 {
                font-size: 24px;
            }
            .article-content {
                padding: 24px 18px;
                font-size: 15px;
                line-height: 1.75;
                border-radius: 12px;
            }
            .article-cta {
                padding: 24px 18px;
                flex-direction: column;
                align-items: stretch;
                text-align: left;
                border-radius: 12px;
            }
            .article-cta__actions .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .logo {
                font-size: 16px;
            }
            .logo .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 17px;
                border-radius: 8px;
            }
            .breadcrumb-section {
                padding-top: 16px;
            }
            .breadcrumb-nav .current {
                max-width: 160px;
            }
            .article-tags {
                padding: 16px 18px;
                border-radius: 12px;
            }
        }

        @media (max-width: 480px) {
            .article-head h1 {
                font-size: 22px;
                line-height: 1.35;
            }
            .article-content {
                font-size: 15px;
                padding: 20px 14px;
            }
            .article-content h2 {
                font-size: 19px;
            }
            .article-content h3 {
                font-size: 17px;
            }
            .article-meta {
                font-size: 13px;
                gap: 8px 14px;
            }
            .btn {
                padding: 10px 18px;
                font-size: 15px;
            }
            .btn-lg {
                padding: 12px 20px;
                font-size: 16px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #F5B301;
            --primary-50: #FEF8E6;
            --primary-100: #FCEFC2;
            --primary-200: #FAE39A;
            --primary-300: #F8D56E;
            --primary-400: #F6C442;
            --primary-500: #F5B301;
            --primary-600: #D99A00;
            --primary-700: #B58000;
            --dark: #25252B;
            --darker: #1B1B1F;
            --bg-warm: #F8F7F2;
            --card-white: #FFFFFF;
            --accent-red: #D91E4A;
            --accent-green: #2E9E6B;
            --text-primary: #1B1B1F;
            --text-secondary: #5E5E66;
            --text-muted: #8A8A92;
            --border-color: #E8E5DC;
            --radius-sm: 8px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-card: 0 2px 12px rgba(27, 27, 31, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(27, 27, 31, 0.10);
            --shadow-nav: 0 4px 16px rgba(27, 27, 31, 0.05);
            --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-title: 'HarmonyOS Sans SC', 'MiSans', 'Alibaba PuHuiTi 3.0', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-mono: 'DIN Alternate', 'Roboto Mono', 'SFMono-Regular', 'Consolas', monospace;
            --transition-base: 0.25s ease;
            --transition-fast: 0.15s ease;
            --container-width: 1200px;
            --nav-height: 68px;
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-warm);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            padding-top: var(--nav-height);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }

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

        a:hover {
            color: var(--primary-600);
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: rgba(248, 247, 242, 0.92);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            backdrop-filter: none;
            -webkit-backdrop-filter: none;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-title);
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            white-space: nowrap;
            flex-shrink: 0;
        }

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

        .logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, #F5B301, #FFD44A);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: var(--darker);
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(245, 179, 1, 0.35);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
        }

        .nav-desktop li {
            position: relative;
        }

        .nav-desktop a {
            display: block;
            padding: 22px 14px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            white-space: nowrap;
        }

        .nav-desktop a:hover {
            color: var(--primary-600);
        }

        .nav-desktop a.active {
            color: var(--darker);
            font-weight: 700;
        }

        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 12px;
            left: 14px;
            right: 14px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }

        .nav-cta {
            flex-shrink: 0;
        }

        .nav-cta .btn-primary {
            padding: 10px 20px;
            font-size: 15px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            z-index: 1100;
            background: transparent;
            border: none;
            cursor: pointer;
        }

        .hamburger span {
            display: block;
            width: 24px;
            height: 3px;
            border-radius: 2px;
            background: var(--darker);
            transition: transform var(--transition-base), opacity var(--transition-base);
        }

        .hamburger.open span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }

        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.open span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            border-radius: var(--radius-md);
            padding: 12px 22px;
            font-size: 16px;
            transition: all var(--transition-base);
            text-align: center;
            border: none;
            cursor: pointer;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn:focus-visible {
            outline: 2px solid rgba(245, 179, 1, 0.45);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--primary);
            color: var(--darker);
            box-shadow: 0 2px 8px rgba(245, 179, 1, 0.3);
        }

        .btn-primary:hover {
            background: var(--primary-400);
            color: var(--darker);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(245, 179, 1, 0.4);
        }

        .btn-primary:active {
            background: var(--primary-600);
            transform: translateY(0);
            box-shadow: 0 2px 4px rgba(245, 179, 1, 0.2);
        }

        .btn-outline {
            background: transparent;
            border: 1px solid var(--dark);
            color: var(--dark);
        }

        .btn-outline:hover {
            background: rgba(37, 37, 43, 0.06);
            color: var(--dark);
            transform: translateY(-1px);
        }

        .btn-outline:active {
            background: rgba(37, 37, 43, 0.1);
            transform: translateY(0);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
            border-radius: var(--radius-sm);
        }

        .btn-lg {
            padding: 14px 28px;
            font-size: 17px;
            border-radius: var(--radius-md);
        }

        .btn-block {
            width: 100%;
            display: flex;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }

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

        .breadcrumb-nav a:hover {
            color: var(--primary-600);
        }

        .breadcrumb-nav .sep {
            color: var(--text-muted);
            user-select: none;
        }

        .breadcrumb-nav .current {
            color: var(--text-primary);
            font-weight: 600;
        }

        /* ===== Category Hero ===== */
        .category-hero {
            padding: 48px 0 56px;
            background: linear-gradient(180deg, #FEF8E6 0%, var(--bg-warm) 100%);
            border-bottom: 1px solid var(--border-color);
        }

        .category-hero .hero-grid {
            display: grid;
            grid-template-columns: 1fr 360px;
            gap: 48px;
            align-items: center;
        }

        .category-hero .hero-text h1 {
            font-family: var(--font-title);
            font-size: clamp(28px, 4.2vw, 42px);
            font-weight: 700;
            line-height: 1.25;
            color: var(--darker);
            margin-bottom: 16px;
        }

        .category-hero .hero-text .hero-desc {
            font-size: 17px;
            line-height: 1.8;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 24px;
        }

        .hero-meta-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .hero-meta-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: 999px;
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
        }

        .hero-meta-badge .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent-green);
            flex-shrink: 0;
        }

        .category-hero .hero-image {
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-card-hover);
            border: 1px solid var(--border-color);
        }

        .category-hero .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            aspect-ratio: 4/3;
        }

        /* ===== Section Common ===== */
        .section {
            padding: 64px 0;
        }

        .section-alt {
            background: var(--card-white);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .section-head {
            margin-bottom: 40px;
        }

        .section-head h2 {
            font-family: var(--font-title);
            font-size: clamp(22px, 3vw, 30px);
            font-weight: 700;
            color: var(--darker);
            line-height: 1.3;
            margin-bottom: 10px;
        }

        .section-head p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.75;
        }

        .section-title-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-100);
            color: var(--primary-700);
            font-size: 13px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 999px;
            margin-bottom: 12px;
        }

        /* ===== Steps Flow ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .step-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            text-align: center;
            position: relative;
            transition: all var(--transition-base);
        }

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

        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--darker);
            font-family: var(--font-mono);
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0;
        }

        .step-arrow {
            position: absolute;
            top: 50%;
            right: -17px;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 20px;
            z-index: 2;
            pointer-events: none;
        }

        .step-card:last-child .step-arrow {
            display: none;
        }

        /* ===== Guide Cards Grid ===== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .guide-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

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

        .guide-card .guide-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 16px;
        }

        .guide-card h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .guide-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        .guide-card .card-tag {
            position: absolute;
            top: 16px;
            right: 16px;
            font-size: 12px;
            font-weight: 600;
            background: var(--primary-50);
            color: var(--primary-700);
            border: 1px solid var(--primary-200);
            border-radius: 999px;
            padding: 3px 10px;
        }

        /* ===== Tips Cards ===== */
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .tip-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px 22px;
            transition: all var(--transition-base);
        }

        .tip-card:hover {
            border-color: var(--primary-300);
            box-shadow: var(--shadow-card);
        }

        .tip-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .tip-card h3::before {
            content: '›';
            color: var(--primary);
            font-weight: 700;
            font-size: 20px;
            line-height: 1;
        }

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

        /* ===== Resource Entries ===== */
        .resource-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .resource-card {
            display: flex;
            gap: 20px;
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
            align-items: center;
        }

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

        .resource-card img {
            width: 120px;
            height: 90px;
            border-radius: var(--radius-md);
            object-fit: cover;
            flex-shrink: 0;
        }

        .resource-card .resource-info h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .resource-card .resource-info p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0 0 12px;
        }

        .resource-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-700);
        }

        .resource-link:hover {
            color: var(--primary-500);
            gap: 8px;
        }

        /* ===== Related Posts ===== */
        .related-posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .post-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

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

        .post-card .post-thumb {
            aspect-ratio: 16/9;
            background: var(--primary-50);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 40px;
            color: var(--primary-400);
            overflow: hidden;
        }

        .post-card .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-base);
        }

        .post-card:hover .post-thumb img {
            transform: scale(1.02);
        }

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

        .post-card .post-meta {
            display: flex;
            gap: 10px;
            align-items: center;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        .post-cat-badge {
            background: var(--primary-100);
            color: var(--primary-700);
            font-size: 12px;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: 999px;
        }

        .post-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.5;
            margin-bottom: 8px;
        }

        .post-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0 0 14px;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .post-card .post-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-700);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .post-card .post-link:hover {
            color: var(--primary-500);
            gap: 8px;
        }

        .empty-state {
            text-align: center;
            padding: 48px 20px;
            background: var(--card-white);
            border: 1px dashed var(--border-color);
            border-radius: var(--radius-lg);
            color: var(--text-muted);
            font-size: 16px;
            grid-column: 1 / -1;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--darker);
            padding: 64px 0;
            color: #FFFFFF;
            text-align: center;
        }

        .cta-section h2 {
            font-family: var(--font-title);
            font-size: clamp(24px, 3.2vw, 34px);
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 14px;
        }

        .cta-section h2 .highlight {
            color: var(--primary);
        }

        .cta-section p {
            font-size: 16px;
            color: #B9B9C0;
            max-width: 600px;
            margin: 0 auto 28px;
            line-height: 1.75;
        }

        .cta-section .cta-buttons {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .cta-section .btn-outline {
            border-color: #FFFFFF;
            color: #FFFFFF;
        }

        .cta-section .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #FFFFFF;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--darker);
            color: #B9B9C0;
            padding: 48px 0 24px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 16px;
        }

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

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

        .footer-col ul a {
            color: #B9B9C0;
            font-size: 14px;
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .footer-bottom p {
            font-size: 13px;
            color: #8A8A92;
            margin: 0;
        }

        .footer-bottom a {
            color: #8A8A92;
        }

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

        /* ===== Mobile Nav Drawer ===== */
        .mobile-drawer-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(27, 27, 31, 0.6);
            z-index: 1050;
            opacity: 0;
            transition: opacity var(--transition-base);
        }

        .mobile-drawer-overlay.show {
            opacity: 1;
        }

        .mobile-drawer {
            display: none;
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            height: 100vh;
            background: var(--dark);
            z-index: 1060;
            padding: 80px 28px 32px;
            transition: right var(--transition-base);
            overflow-y: auto;
        }

        .mobile-drawer.show {
            right: 0;
        }

        .mobile-drawer ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .mobile-drawer ul a {
            display: block;
            padding: 14px 16px;
            font-size: 17px;
            font-weight: 500;
            color: #FFFFFF;
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
        }

        .mobile-drawer ul a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--primary);
        }

        .mobile-drawer ul a.active {
            background: var(--primary);
            color: var(--darker);
            font-weight: 700;
        }

        .mobile-drawer .drawer-cta {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.12);
        }

        .mobile-drawer .drawer-cta .btn-primary {
            width: 100%;
            display: flex;
        }

        /* ===== Focus / Active ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid rgba(245, 179, 1, 0.45);
            outline-offset: 2px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1199px) {
            .guide-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .related-posts-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 991px) {
            .category-hero .hero-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .category-hero .hero-image {
                max-width: 480px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .step-arrow {
                display: none;
            }
            .tips-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 767px) {
            .nav-desktop {
                display: none;
            }
            .nav-cta {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-drawer-overlay {
                display: block;
                pointer-events: none;
            }
            .mobile-drawer-overlay.show {
                pointer-events: auto;
            }
            .mobile-drawer {
                display: block;
            }
            .section {
                padding: 44px 0;
            }
            .section-head {
                margin-bottom: 28px;
            }
            .guide-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .tips-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .resource-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .resource-card {
                flex-direction: column;
                align-items: flex-start;
            }
            .resource-card img {
                width: 100%;
                height: 160px;
            }
            .related-posts-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .category-hero {
                padding: 32px 0 40px;
            }
            .cta-section {
                padding: 44px 0;
            }
            .cta-section .cta-buttons {
                flex-direction: column;
            }
            .cta-section .btn {
                width: 100%;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .step-card {
                padding: 22px 18px;
            }
        }

        @media (max-width: 479px) {
            .logo {
                font-size: 16px;
            }
            .logo .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 18px;
                border-radius: 8px;
            }
            .section-head h2 {
                font-size: 20px;
            }
            .guide-card {
                padding: 20px 18px;
            }
            .guide-card h3 {
                font-size: 17px;
            }
            .btn {
                padding: 10px 18px;
                font-size: 15px;
            }
            .btn-lg {
                padding: 12px 22px;
                font-size: 16px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #F5B301;
            --primary-50: #FEF8E6;
            --primary-100: #FCEFC2;
            --primary-200: #FAE39A;
            --primary-300: #F8D56E;
            --primary-400: #F6C442;
            --primary-500: #F5B301;
            --primary-600: #D99A00;
            --primary-700: #B58000;
            --dark: #25252B;
            --darker: #1B1B1F;
            --bg-warm: #F8F7F2;
            --card-white: #FFFFFF;
            --accent-red: #D91E4A;
            --accent-green: #2E9E6B;
            --text-primary: #1B1B1F;
            --text-secondary: #5E5E66;
            --text-muted: #8A8A92;
            --border-color: #E8E5DC;
            --radius-sm: 8px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-card: 0 2px 12px rgba(27, 27, 31, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(27, 27, 31, 0.10);
            --shadow-nav: 0 4px 16px rgba(27, 27, 31, 0.05);
            --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-title: 'HarmonyOS Sans SC', 'MiSans', 'Alibaba PuHuiTi 3.0', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-mono: 'DIN Alternate', 'Roboto Mono', 'SFMono-Regular', 'Consolas', monospace;
            --transition-base: 0.25s ease;
            --transition-fast: 0.15s ease;
            --container-width: 1200px;
            --nav-height: 68px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-warm);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            padding-top: var(--nav-height);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: rgba(248, 247, 242, 0.92);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            -webkit-backdrop-filter: none;
            backdrop-filter: none;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-title);
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, #F5B301, #FFD44A);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: var(--darker);
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(245, 179, 1, 0.35);
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-desktop li {
            position: relative;
        }
        .nav-desktop a {
            display: block;
            padding: 22px 14px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            white-space: nowrap;
        }
        .nav-desktop a:hover {
            color: var(--primary-600);
        }
        .nav-desktop a.active {
            color: var(--darker);
            font-weight: 700;
        }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 12px;
            left: 14px;
            right: 14px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }
        .nav-cta {
            flex-shrink: 0;
        }
        .nav-cta .btn-primary {
            padding: 10px 20px;
            font-size: 15px;
        }
        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            z-index: 1100;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 3px;
            border-radius: 2px;
            background: var(--darker);
            transition: transform var(--transition-fast), opacity var(--transition-fast);
        }
        /* Mobile Nav */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--darker);
            z-index: 1050;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 24px;
            padding: 20px;
            transform: translateY(-100%);
            transition: transform 0.3s ease;
        }
        .mobile-nav.open {
            transform: translateY(0);
        }
        .mobile-nav a {
            color: #FFFFFF;
            font-size: 22px;
            font-weight: 600;
            padding: 8px 16px;
        }
        .mobile-nav a.active {
            color: var(--primary);
        }
        .mobile-nav .btn-primary {
            margin-top: 16px;
            padding: 14px 32px;
            font-size: 18px;
        }
        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            border-radius: var(--radius-md);
            padding: 12px 22px;
            font-size: 16px;
            transition: all var(--transition-base);
            border: 1px solid transparent;
            text-align: center;
        }
        .btn:focus-visible {
            outline: 2px solid rgba(245, 179, 1, 0.45);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--darker);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-400);
            border-color: var(--primary-400);
            color: var(--darker);
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(245, 179, 1, 0.35);
        }
        .btn-primary:active {
            background: var(--primary-600);
            border-color: var(--primary-600);
            transform: translateY(0);
            box-shadow: none;
        }
        .btn-outline-dark {
            background: transparent;
            color: var(--darker);
            border-color: var(--darker);
        }
        .btn-outline-dark:hover {
            background: rgba(37, 37, 43, 0.06);
            color: var(--darker);
            border-color: var(--darker);
            transform: translateY(-1px);
        }
        .btn-outline-dark:active {
            background: rgba(37, 37, 43, 0.1);
            transform: translateY(0);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
            border-radius: var(--radius-sm);
        }
        .btn-lg {
            padding: 14px 28px;
            font-size: 18px;
            border-radius: var(--radius-md);
        }
        /* ===== Breadcrumb ===== */
        .breadcrumb-section {
            padding: 24px 0 12px;
            background: var(--bg-warm);
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-secondary);
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .breadcrumb-nav li {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .breadcrumb-nav li+li::before {
            content: '/';
            color: var(--text-muted);
            font-size: 12px;
        }
        .breadcrumb-nav a {
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }
        .breadcrumb-nav a:hover {
            color: var(--primary-600);
        }
        .breadcrumb-nav .current {
            color: var(--text-primary);
            font-weight: 600;
        }
        /* ===== Category Hero ===== */
        .category-hero {
            padding: 32px 0 48px;
        }
        .category-hero h1 {
            font-family: var(--font-title);
            font-size: clamp(28px, 4vw, 42px);
            font-weight: 700;
            line-height: 1.25;
            color: var(--darker);
            margin-bottom: 16px;
        }
        .category-hero .lead {
            font-size: 18px;
            line-height: 1.8;
            color: var(--text-secondary);
            max-width: 720px;
            margin-bottom: 0;
        }
        /* ===== Steps ===== */
        .steps-section {
            padding: 56px 0;
            background: var(--card-white);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 1px;
            text-transform: uppercase;
            color: var(--primary-700);
            background: var(--primary-50);
            border: 1px solid var(--primary-200);
            border-radius: 999px;
            padding: 4px 14px;
            margin-bottom: 16px;
        }
        .section-title {
            font-family: var(--font-title);
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--darker);
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 640px;
        }
        .steps-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .step-item {
            text-align: center;
            padding: 24px 16px;
            background: var(--bg-warm);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            transition: all var(--transition-base);
        }
        .step-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .step-item .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--darker);
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 14px;
        }
        .step-item h3 {
            font-family: var(--font-title);
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 0;
            line-height: 1.6;
        }
        /* ===== Usage Guide Grid ===== */
        .usage-guide-section {
            padding: 64px 0;
        }
        .usage-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .usage-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .usage-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary);
            transform: translateY(-2px);
        }
        .usage-card .card-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-50);
            color: var(--primary-700);
            font-size: 24px;
            flex-shrink: 0;
        }
        .usage-card h3 {
            font-family: var(--font-title);
            font-size: 19px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 0;
        }
        .usage-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
            flex-grow: 1;
        }
        .usage-card .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-700);
            transition: color var(--transition-fast);
            align-self: flex-start;
        }
        .usage-card .card-link:hover {
            color: var(--primary-600);
        }
        /* ===== Tips ===== */
        .tips-section {
            padding: 56px 0;
            background: var(--card-white);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .tip-card {
            background: var(--bg-warm);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: all var(--transition-base);
        }
        .tip-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-card-hover);
        }
        .tip-card h4 {
            font-family: var(--font-title);
            font-size: 17px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 6px;
        }
        .tip-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0;
        }
        /* ===== Resource Cards ===== */
        .resource-section {
            padding: 64px 0;
        }
        .resource-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .resource-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            display: flex;
            align-items: center;
            gap: 20px;
        }
        .resource-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary);
            transform: translateY(-2px);
        }
        .resource-card .resource-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: var(--primary-50);
            color: var(--primary-700);
            font-size: 28px;
            flex-shrink: 0;
        }
        .resource-card h3 {
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 4px;
        }
        .resource-card p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .resource-card .btn {
            margin-left: auto;
            flex-shrink: 0;
        }
        /* ===== Related Articles ===== */
        .related-articles-section {
            padding: 56px 0;
            background: var(--card-white);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-warm);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }
        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary);
            transform: translateY(-2px);
        }
        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .related-card .related-body {
            padding: 18px 20px;
        }
        .related-card h4 {
            font-family: var(--font-title);
            font-size: 17px;
            font-weight: 700;
            color: var(--darker);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0;
        }
        /* ===== Help CTA ===== */
        .help-cta-section {
            padding: 64px 0;
        }
        .help-cta-box {
            background: var(--darker);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }
        .help-cta-box .cta-text {
            flex: 1;
            min-width: 260px;
        }
        .help-cta-box .cta-text h2 {
            font-family: var(--font-title);
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 8px;
            line-height: 1.3;
        }
        .help-cta-box .cta-text p {
            font-size: 16px;
            color: #B9B9C0;
            margin-bottom: 0;
            line-height: 1.7;
        }
        .help-cta-box .cta-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .help-cta-box .btn-primary {
            background: var(--primary);
            color: var(--darker);
            border-color: var(--primary);
        }
        .help-cta-box .btn-primary:hover {
            background: var(--primary-400);
            border-color: var(--primary-400);
        }
        .help-cta-box .btn-outline-light {
            background: transparent;
            color: #FFFFFF;
            border-color: rgba(255, 255, 255, 0.4);
        }
        .help-cta-box .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.6);
            color: #FFFFFF;
        }
        /* ===== Footer ===== */
        .site-footer {
            background: var(--darker);
            color: #B9B9C0;
            padding: 48px 0 0;
            margin-top: 40px;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .site-footer .footer-col h4 {
            font-family: var(--font-title);
            font-size: 16px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 16px;
        }
        .site-footer .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .site-footer .footer-col a {
            color: #B9B9C0;
            font-size: 14px;
            transition: color var(--transition-fast);
        }
        .site-footer .footer-col a:hover {
            color: var(--primary);
        }
        .site-footer .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            padding: 20px 0;
        }
        .site-footer .footer-bottom p {
            font-size: 13px;
            margin-bottom: 0;
            color: var(--text-muted);
        }
        .site-footer .footer-bottom a {
            color: var(--text-muted);
            font-size: 13px;
            transition: color var(--transition-fast);
        }
        .site-footer .footer-bottom a:hover {
            color: var(--primary);
        }
        /* ===== Responsive ===== */
        @media (max-width: 1200px) {
            .steps-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .usage-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 992px) {
            .nav-desktop {
                display: none;
            }
            .nav-cta {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-nav {
                display: flex;
            }
            .tips-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .resource-grid {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            body {
                padding-top: var(--nav-height);
            }
            .category-hero h1 {
                font-size: 26px;
            }
            .steps-row {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .usage-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .tips-grid {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .help-cta-box {
                flex-direction: column;
                align-items: flex-start;
                padding: 32px 24px;
            }
            .help-cta-box .cta-actions {
                width: 100%;
                flex-direction: column;
            }
            .help-cta-box .cta-actions .btn {
                width: 100%;
            }
            .site-footer .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .resource-card {
                flex-direction: column;
                align-items: flex-start;
                gap: 16px;
            }
            .resource-card .btn {
                margin-left: 0;
            }
        }
        @media (max-width: 480px) {
            .category-hero h1 {
                font-size: 22px;
            }
            .category-hero .lead {
                font-size: 15px;
            }
            .section-title {
                font-size: 20px;
            }
            .usage-card {
                padding: 18px;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .btn {
                padding: 10px 18px;
                font-size: 15px;
            }
            .btn-lg {
                padding: 12px 22px;
                font-size: 16px;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #F5B301;
            --primary-50: #FEF8E6;
            --primary-100: #FCEFC2;
            --primary-200: #FAE39A;
            --primary-300: #F8D56E;
            --primary-400: #F6C442;
            --primary-500: #F5B301;
            --primary-600: #D99A00;
            --primary-700: #B58000;
            --dark: #25252B;
            --darker: #1B1B1F;
            --bg-warm: #F8F7F2;
            --card-white: #FFFFFF;
            --accent-red: #D91E4A;
            --accent-green: #2E9E6B;
            --text-primary: #1B1B1F;
            --text-secondary: #5E5E66;
            --text-muted: #8A8A92;
            --border-color: #E8E5DC;
            --radius-sm: 8px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-card: 0 2px 12px rgba(27, 27, 31, 0.06);
            --shadow-card-hover: 0 8px 24px rgba(27, 27, 31, 0.10);
            --shadow-nav: 0 4px 16px rgba(27, 27, 31, 0.05);
            --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-title: 'HarmonyOS Sans SC', 'MiSans', 'Alibaba PuHuiTi 3.0', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-mono: 'DIN Alternate', 'Roboto Mono', 'SFMono-Regular', 'Consolas', monospace;
            --transition-base: 0.25s ease;
            --transition-fast: 0.15s ease;
            --container-width: 1200px;
            --nav-height: 68px;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-warm);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            margin: 0;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }

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

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

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

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: rgba(248, 247, 242, 0.92);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            -webkit-backdrop-filter: none;
            backdrop-filter: none;
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-title);
            font-size: 18px;
            font-weight: 700;
            color: var(--darker);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, #F5B301, #FFD44A);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: var(--darker);
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(245, 179, 1, 0.35);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-desktop li {
            position: relative;
        }

        .nav-desktop a {
            display: block;
            padding: 22px 14px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            white-space: nowrap;
        }

        .nav-desktop a:hover {
            color: var(--primary-600);
        }

        .nav-desktop a.active {
            color: var(--darker);
            font-weight: 700;
        }

        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 12px;
            left: 14px;
            right: 14px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }

        .nav-cta {
            flex-shrink: 0;
        }

        .nav-cta .btn-primary {
            padding: 10px 20px;
            font-size: 15px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            z-index: 1100;
        }

        .hamburger span {
            display: block;
            width: 24px;
            height: 3px;
            border-radius: 2px;
            background: var(--darker);
            transition: transform var(--transition-fast), opacity var(--transition-fast);
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* Mobile drawer */
        .mobile-drawer {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: var(--darker);
            z-index: 999;
            padding: 24px 20px 32px;
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
        }

        .mobile-drawer.open {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }

        .mobile-drawer ul {
            list-style: none;
            padding: 0;
            margin: 0 0 20px;
        }

        .mobile-drawer ul li {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .mobile-drawer ul li:last-child {
            border-bottom: none;
        }

        .mobile-drawer ul a {
            display: block;
            padding: 14px 8px;
            font-size: 17px;
            font-weight: 500;
            color: #FFFFFF;
            transition: color var(--transition-fast);
        }

        .mobile-drawer ul a:hover,
        .mobile-drawer ul a.active {
            color: var(--primary);
        }

        .mobile-drawer .btn {
            width: 100%;
            text-align: center;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 22px;
            font-size: 16px;
            font-weight: 600;
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            text-decoration: none;
            cursor: pointer;
            border: 1px solid transparent;
            line-height: 1.4;
        }

        .btn:focus {
            outline: 2px solid rgba(245, 179, 1, 0.45);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--primary);
            color: var(--darker);
            border-color: var(--primary);
        }

        .btn-primary:hover {
            background: var(--primary-400);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(245, 179, 1, 0.30);
            color: var(--darker);
        }

        .btn-primary:active {
            background: var(--primary-600);
            transform: translateY(0);
        }

        .btn-outline {
            background: transparent;
            color: var(--darker);
            border-color: var(--darker);
        }

        .btn-outline:hover {
            background: rgba(37, 37, 43, 0.06);
            transform: translateY(-1px);
            color: var(--darker);
        }

        .btn-outline:active {
            background: rgba(37, 37, 43, 0.10);
        }

        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
        }

        .btn-lg {
            padding: 16px 32px;
            font-size: 18px;
            border-radius: 12px;
        }

        /* ===== Sections ===== */
        main {
            flex: 1;
            padding-top: var(--nav-height);
        }

        section {
            padding: 64px 0;
        }

        .section-alt {
            background: #FFFFFF;
        }

        .section-dark {
            background: var(--darker);
            color: #FFFFFF;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-bar {
            background: var(--primary-50);
            border-bottom: 1px solid var(--primary-100);
            padding: 16px 0;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .breadcrumb-bar a {
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }

        .breadcrumb-bar a:hover {
            color: var(--primary-600);
        }

        .breadcrumb-bar .separator {
            margin: 0 10px;
            color: var(--text-muted);
        }

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

        /* ===== Page Hero ===== */
        .page-hero {
            padding: 48px 0 40px;
            background: var(--bg-warm);
        }

        .page-hero h1 {
            font-family: var(--font-title);
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 700;
            line-height: 1.2;
            color: var(--darker);
            margin: 0 0 16px;
        }

        .page-hero .subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.8;
            margin: 0;
        }

        /* ===== Section Headings ===== */
        .section-heading {
            margin-bottom: 40px;
        }

        .section-heading h2 {
            font-family: var(--font-title);
            font-size: clamp(24px, 3.5vw, 32px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--darker);
            margin: 0 0 12px;
        }

        .section-heading p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0;
            line-height: 1.7;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            height: 100%;
        }

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

        .card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 16px;
            flex-shrink: 0;
            transition: background var(--transition-fast);
        }

        .card:hover .card-icon {
            background: var(--primary-200);
        }

        .card h3 {
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 600;
            color: var(--darker);
            margin: 0 0 8px;
        }

        .card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        /* ===== Grid ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

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

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        /* ===== Timeline ===== */
        .timeline {
            position: relative;
            padding-left: 28px;
            list-style: none;
            margin: 0;
            padding-top: 4px;
        }

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

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

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

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -24px;
            top: 6px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-100);
        }

        .timeline-item .timeline-version {
            font-family: var(--font-mono);
            font-size: 15px;
            font-weight: 700;
            color: var(--darker);
            display: inline-block;
            background: var(--primary-50);
            padding: 4px 12px;
            border-radius: 6px;
            margin-bottom: 6px;
            border: 1px solid var(--primary-100);
        }

        .timeline-item .timeline-date {
            font-family: var(--font-mono);
            font-size: 13px;
            color: var(--text-muted);
            margin-left: 10px;
        }

        .timeline-item .timeline-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 4px 0 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color var(--transition-fast);
        }

        .faq-item.active {
            border-color: var(--primary);
            background: #FAF9F5;
            border-left: 3px solid var(--primary);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            transition: color var(--transition-fast);
            width: 100%;
            text-align: left;
            background: none;
            border: none;
        }

        .faq-question:hover {
            color: var(--primary-600);
        }

        .faq-question:focus {
            outline: 2px solid rgba(245, 179, 1, 0.45);
            outline-offset: -2px;
        }

        .faq-question .faq-arrow {
            flex-shrink: 0;
            font-size: 16px;
            color: var(--text-muted);
            transition: transform var(--transition-base);
            display: inline-flex;
            align-items: center;
        }

        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary-600);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
        }

        .faq-item.active .faq-answer {
            max-height: 220px;
            padding: 0 20px 18px;
        }

        .faq-answer p {
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-secondary);
            margin: 0;
        }

        /* ===== Subscription Form ===== */
        .subscribe-box {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 40px 32px;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            gap: 32px;
            flex-wrap: wrap;
        }

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

        .subscribe-box .subscribe-text h3 {
            font-family: var(--font-title);
            font-size: 22px;
            font-weight: 700;
            color: var(--darker);
            margin: 0 0 8px;
        }

        .subscribe-box .subscribe-text p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.7;
        }

        .subscribe-form {
            display: flex;
            gap: 12px;
            flex-shrink: 0;
        }

        .subscribe-form input {
            height: 48px;
            min-width: 260px;
            padding: 0 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: 15px;
            background: #FFFFFF;
            color: var(--text-primary);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .subscribe-form input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(245, 179, 1, 0.15);
        }

        .subscribe-form .btn {
            height: 48px;
            padding: 0 24px;
            white-space: nowrap;
        }

        .form-success {
            display: none;
            background: rgba(46, 158, 107, 0.10);
            border: 1px solid var(--accent-green);
            border-radius: var(--radius-md);
            padding: 12px 16px;
            font-size: 14px;
            color: var(--accent-green);
            margin-top: 12px;
            width: 100%;
        }

        .form-success.visible {
            display: block;
        }

        /* ===== Permission Cards ===== */
        .permission-card {
            background: var(--card-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            height: 100%;
            text-align: center;
        }

        .permission-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        .permission-card .perm-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin: 0 auto 16px;
            transition: background var(--transition-fast);
        }

        .permission-card:hover .perm-icon {
            background: var(--primary-200);
        }

        .permission-card h3 {
            font-family: var(--font-title);
            font-size: 19px;
            font-weight: 600;
            color: var(--darker);
            margin: 0 0 10px;
        }

        .permission-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        /* ===== Policy Cards ===== */
        .policy-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .policy-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-200);
        }

        .policy-card h3 {
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 600;
            color: var(--darker);
            margin: 0 0 12px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-100);
        }

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

        .policy-card ul li {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            padding: 6px 0;
            padding-left: 20px;
            position: relative;
        }

        .policy-card ul li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 14px;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--primary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1200px) {
            .grid-4 {
                grid-template-columns: repeat(3, 1fr);
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        @media (max-width: 992px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .nav-cta {
                display: none;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-drawer {
                display: block;
            }
            section {
                padding: 48px 0;
            }
            .subscribe-box {
                flex-direction: column;
                align-items: flex-start;
            }
            .subscribe-form {
                width: 100%;
                flex-wrap: wrap;
            }
            .subscribe-form input {
                min-width: 0;
                flex: 1;
            }
        }

        @media (max-width: 768px) {
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .grid-2 {
                grid-template-columns: 1fr;
            }
            section {
                padding: 36px 0;
            }
            .page-hero {
                padding: 32px 0 28px;
            }
            .page-hero h1 {
                font-size: 26px;
            }
            .section-heading h2 {
                font-size: 22px;
            }
            .timeline {
                padding-left: 20px;
            }
            .timeline-item::before {
                left: -18px;
                width: 8px;
                height: 8px;
            }
            .faq-question {
                font-size: 16px;
                padding: 14px 16px;
            }
            .faq-item.active .faq-answer {
                padding: 0 16px 14px;
            }
            .subscribe-box {
                padding: 28px 20px;
            }
            .subscribe-form .btn {
                width: 100%;
            }
            .subscribe-form input {
                width: 100%;
                flex: none;
            }
            .card {
                padding: 18px;
            }
            .permission-card {
                padding: 20px 16px;
            }
            .policy-card {
                padding: 20px 16px;
            }
        }

        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 22px;
            }
            .page-hero .subtitle {
                font-size: 15px;
            }
            .section-heading h2 {
                font-size: 19px;
            }
            .btn-lg {
                padding: 14px 22px;
                font-size: 16px;
                width: 100%;
            }
            .card h3 {
                font-size: 18px;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                gap: 16px;
            }
            .timeline-item .timeline-date {
                display: block;
                margin-left: 0;
                margin-top: 2px;
            }
        }