/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1a2e;
            --primary-light: #1a2d4a;
            --primary-dark: #070d17;
            --accent: #f0b429;
            --accent-hover: #d49f1a;
            --accent-glow: rgba(240, 180, 41, 0.25);
            --secondary: #3b82f6;
            --secondary-hover: #2563eb;
            --surface: #0e1628;
            --surface-card: #131e33;
            --surface-card-hover: #182640;
            --border: rgba(240, 180, 41, 0.15);
            --border-light: rgba(255, 255, 255, 0.06);
            --text-primary: #e8edf5;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --text-accent: #f0b429;
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --sidebar-width: 260px;
            --header-height: 68px;
            --max-width: 1280px;
            --space-section: 5rem;
            --space-block: 3rem;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--primary-dark);
            min-height: 100vh;
            display: flex;
        }
        a {
            color: var(--text-accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
            border-radius: var(--radius-sm);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
        }
        h1 {
            font-size: 3.2rem;
        }
        h2 {
            font-size: 2.2rem;
            letter-spacing: -0.02em;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 2rem;
            width: 100%;
        }
        .section-label {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--text-accent);
            background: rgba(240, 180, 41, 0.08);
            padding: 0.3rem 1rem;
            border-radius: 20px;
            border: 1px solid rgba(240, 180, 41, 0.15);
            margin-bottom: 1rem;
        }
        .section-title {
            margin-bottom: 0.75rem;
        }
        .section-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-header .section-sub {
            margin: 0 auto;
        }
        .glow {
            text-shadow: 0 0 40px rgba(240, 180, 41, 0.15);
        }
        .badge {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            padding: 0.2rem 0.7rem;
            border-radius: 20px;
            background: rgba(240, 180, 41, 0.1);
            color: var(--text-accent);
            border: 1px solid rgba(240, 180, 41, 0.12);
        }
        .badge-secondary {
            background: rgba(59, 130, 246, 0.1);
            color: var(--secondary);
            border-color: rgba(59, 130, 246, 0.15);
        }
        .badge-neutral {
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-secondary);
            border-color: rgba(255, 255, 255, 0.06);
        }
        .divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border), transparent);
            margin: var(--space-section) 0;
        }
        .text-accent {
            color: var(--text-accent);
        }
        .text-center {
            text-align: center;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.6rem;
            padding: 0.7rem 1.8rem;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: var(--radius-md);
            transition: all var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--accent);
            color: #0a0e1a;
            border-color: var(--accent);
            box-shadow: 0 0 20px var(--accent-glow);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            box-shadow: 0 0 32px var(--accent-glow);
            transform: translateY(-2px);
            color: #0a0e1a;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 0 12px var(--accent-glow);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-primary);
            border-color: rgba(255, 255, 255, 0.15);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--text-accent);
            background: rgba(240, 180, 41, 0.06);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-ghost {
            background: transparent;
            color: var(--text-secondary);
            border-color: transparent;
        }
        .btn-ghost:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
        }
        .btn-sm {
            padding: 0.45rem 1.2rem;
            font-size: 0.85rem;
            border-radius: var(--radius-sm);
        }
        .btn-lg {
            padding: 0.9rem 2.4rem;
            font-size: 1.05rem;
            border-radius: var(--radius-md);
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
        }

        /* ===== Layout: Sidebar + Main ===== */
        .layout {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== Sidebar ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 100;
            transition: transform var(--transition);
            padding: 0;
            overflow-y: auto;
        }
        .sidebar-brand {
            padding: 1.8rem 1.5rem 1.2rem;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .sidebar-brand .logo-icon {
            width: 38px;
            height: 38px;
            background: var(--accent);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #0a0e1a;
            font-size: 1.2rem;
            font-weight: 800;
            flex-shrink: 0;
        }
        .sidebar-brand .logo-text {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
            letter-spacing: -0.01em;
        }
        .sidebar-brand .logo-text span {
            color: var(--text-accent);
        }
        .sidebar-nav {
            padding: 1.2rem 0.8rem;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
        }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            padding: 0.7rem 1rem;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 0.92rem;
            font-weight: 500;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 0.95rem;
            flex-shrink: 0;
        }
        .sidebar-nav .nav-item:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
            border-color: var(--border-light);
        }
        .sidebar-nav .nav-item.active {
            color: var(--text-accent);
            background: rgba(240, 180, 41, 0.08);
            border-color: rgba(240, 180, 41, 0.12);
        }
        .sidebar-nav .nav-item.active i {
            color: var(--accent);
        }
        .sidebar-nav .nav-divider {
            height: 1px;
            background: var(--border-light);
            margin: 0.6rem 0;
        }
        .sidebar-footer {
            padding: 1rem 1.2rem 1.5rem;
            border-top: 1px solid var(--border-light);
            font-size: 0.75rem;
            color: var(--text-muted);
            text-align: center;
            line-height: 1.5;
        }
        .sidebar-footer a {
            color: var(--text-muted);
        }
        .sidebar-footer a:hover {
            color: var(--text-secondary);
        }

        /* ===== Main Content ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            background: var(--primary-dark);
            position: relative;
            z-index: 1;
        }

        /* ===== Mobile Header (hidden on desktop) ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--primary);
            border-bottom: 1px solid var(--border);
            z-index: 200;
            padding: 0 1.2rem;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .logo-text {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
        }
        .mobile-header .logo-text span {
            color: var(--text-accent);
        }
        .mobile-header .hamburger {
            width: 40px;
            height: 40px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
            border: 1px solid var(--border-light);
        }
        .mobile-header .hamburger:hover {
            background: rgba(255, 255, 255, 0.04);
        }
        .mobile-header .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .mobile-header .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-header .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-header .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 86vh;
            display: flex;
            align-items: center;
            padding: 6rem 2rem 4rem;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
            mask-image: linear-gradient(180deg, #000 60%, transparent 100%);
            -webkit-mask-image: linear-gradient(180deg, #000 60%, transparent 100%);
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(15, 26, 46, 0.6) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 30%, rgba(240, 180, 41, 0.05) 0%, transparent 50%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-content {
            max-width: 700px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(240, 180, 41, 0.08);
            border: 1px solid rgba(240, 180, 41, 0.12);
            padding: 0.35rem 1.1rem 0.35rem 0.8rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: var(--text-accent);
            margin-bottom: 1.5rem;
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            background: var(--accent);
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(0.8);
            }
        }
        .hero h1 {
            font-size: 3.6rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 1.2rem;
            letter-spacing: -0.02em;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent), #f7d875);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 560px;
            margin-bottom: 2rem;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .hero-stats {
            display: flex;
            gap: 2.5rem;
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid var(--border-light);
        }
        .hero-stats .stat-item {
            display: flex;
            flex-direction: column;
        }
        .hero-stats .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        .hero-stats .stat-number .accent {
            color: var(--text-accent);
        }
        .hero-stats .stat-label {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 0.15rem;
        }

        /* ===== Intro / About ===== */
        .intro-section {
            padding: var(--space-section) 0;
            background: var(--primary);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            position: relative;
        }
        .intro-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 320px;
        }
        .intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: var(--radius-lg);
            box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.4);
            pointer-events: none;
        }
        .intro-text h2 {
            margin-bottom: 1rem;
        }
        .intro-text p {
            margin-bottom: 1.2rem;
        }
        .intro-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.8rem;
            margin-top: 1.5rem;
        }
        .intro-features li {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .intro-features li i {
            color: var(--accent);
            font-size: 0.8rem;
            width: 18px;
            text-align: center;
        }

        /* ===== Category Cards ===== */
        .category-section {
            padding: var(--space-section) 0;
            background: var(--primary-dark);
        }
        .category-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .category-card {
            background: var(--surface-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 1.8rem 1.5rem;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), transparent);
            opacity: 0;
            transition: opacity var(--transition);
        }
        .category-card:hover {
            background: var(--surface-card-hover);
            border-color: rgba(240, 180, 41, 0.12);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .category-card:hover::before {
            opacity: 1;
        }
        .category-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(240, 180, 41, 0.06);
            border: 1px solid rgba(240, 180, 41, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent);
            margin-bottom: 1.2rem;
        }
        .category-card h3 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
        }
        .category-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 1rem;
            line-height: 1.6;
        }
        .category-card .card-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-accent);
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            transition: gap var(--transition);
        }
        .category-card .card-link i {
            font-size: 0.7rem;
            transition: transform var(--transition);
        }
        .category-card:hover .card-link i {
            transform: translateX(4px);
        }

        /* ===== Featured / Data ===== */
        .featured-section {
            padding: var(--space-section) 0;
            background: var(--primary);
            position: relative;
        }
        .featured-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.04;
            pointer-events: none;
        }
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            position: relative;
            z-index: 1;
        }
        .featured-card {
            background: var(--surface-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 2rem 1.5rem;
            text-align: center;
            transition: all var(--transition);
        }
        .featured-card:hover {
            background: var(--surface-card-hover);
            border-color: rgba(240, 180, 41, 0.1);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }
        .featured-card .f-icon {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 1rem;
        }
        .featured-card .f-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        .featured-card .f-number .accent {
            color: var(--text-accent);
        }
        .featured-card .f-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 0.3rem;
        }

        /* ===== Latest Posts (CMS) ===== */
        .posts-section {
            padding: var(--space-section) 0;
            background: var(--primary-dark);
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .post-card {
            background: var(--surface-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            background: var(--surface-card-hover);
            border-color: rgba(240, 180, 41, 0.1);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }
        .post-card .post-thumb {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--primary);
        }
        .post-card .post-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-bottom: 0.6rem;
        }
        .post-card .post-meta .cat {
            color: var(--text-accent);
            background: rgba(240, 180, 41, 0.06);
            padding: 0.1rem 0.6rem;
            border-radius: 10px;
            border: 1px solid rgba(240, 180, 41, 0.08);
        }
        .post-card h3 {
            font-size: 1.05rem;
            margin-bottom: 0.5rem;
            line-height: 1.4;
        }
        .post-card h3 a {
            color: var(--text-primary);
        }
        .post-card h3 a:hover {
            color: var(--text-accent);
        }
        .post-card .post-excerpt {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
            flex: 1;
            margin-bottom: 0.8rem;
        }
        .post-card .post-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.75rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-light);
            padding-top: 0.8rem;
        }
        .post-card .post-footer .read-more {
            color: var(--text-accent);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .post-card .post-footer .read-more i {
            font-size: 0.6rem;
            transition: transform var(--transition);
        }
        .post-card:hover .post-footer .read-more i {
            transform: translateX(3px);
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 3rem 1rem;
            color: var(--text-muted);
            background: var(--surface-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-light);
        }
        .posts-empty i {
            font-size: 2rem;
            margin-bottom: 0.8rem;
            opacity: 0.5;
        }

        /* ===== Process / Steps ===== */
        .process-section {
            padding: var(--space-section) 0;
            background: var(--primary);
        }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            counter-reset: step;
        }
        .process-step {
            background: var(--surface-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 2rem 1.5rem;
            text-align: center;
            position: relative;
            transition: all var(--transition);
        }
        .process-step:hover {
            background: var(--surface-card-hover);
            border-color: rgba(240, 180, 41, 0.1);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }
        .process-step .step-number {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(240, 180, 41, 0.08);
            border: 1px solid rgba(240, 180, 41, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--accent);
            margin: 0 auto 1rem;
        }
        .process-step h3 {
            font-size: 1rem;
            margin-bottom: 0.5rem;
        }
        .process-step p {
            font-size: 0.82rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0;
        }
        .process-step .step-arrow {
            position: absolute;
            right: -1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 1.2rem;
            opacity: 0.3;
            pointer-events: none;
        }
        .process-step:last-child .step-arrow {
            display: none;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: var(--space-section) 0;
            background: var(--primary-dark);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .faq-item {
            background: var(--surface-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(240, 180, 41, 0.08);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 1.2rem 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            background: transparent;
            border: none;
            cursor: pointer;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--text-accent);
        }
        .faq-question i {
            font-size: 0.8rem;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 1.5rem;
        }
        .faq-answer-inner {
            padding-bottom: 1.2rem;
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 1.5rem;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: var(--space-section) 0;
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.06;
            pointer-events: none;
        }
        .cta-box {
            background: var(--surface-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 3.5rem 3rem;
            text-align: center;
            position: relative;
            z-index: 1;
            box-shadow: var(--shadow);
        }
        .cta-box h2 {
            margin-bottom: 0.8rem;
        }
        .cta-box p {
            max-width: 560px;
            margin: 0 auto 1.8rem;
            font-size: 1rem;
        }
        .cta-box .btn {
            font-size: 1.05rem;
            padding: 0.9rem 2.6rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            border-top: 1px solid var(--border-light);
            padding: 3rem 2rem 1.8rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .footer-brand .logo-text {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
        }
        .footer-brand .logo-text span {
            color: var(--text-accent);
        }
        .footer-brand p {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-top: 0.8rem;
            max-width: 300px;
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
            letter-spacing: 0.04em;
        }
        .footer-col ul li {
            margin-bottom: 0.5rem;
        }
        .footer-col ul li a {
            font-size: 0.82rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--text-accent);
        }
        .footer-bottom {
            max-width: var(--max-width);
            margin: 2rem auto 0;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.75rem;
            color: var(--text-muted);
            flex-wrap: wrap;
            gap: 0.8rem;
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--text-secondary);
        }
        .footer-social {
            display: flex;
            gap: 0.8rem;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 0.85rem;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: rgba(240, 180, 41, 0.08);
            border-color: rgba(240, 180, 41, 0.15);
            color: var(--accent);
            transform: translateY(-2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1200px) {
            .featured-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-step .step-arrow {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 1024px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .intro-image {
                order: -1;
            }
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .posts-grid {
                grid-template-columns: 1fr;
            }
            :root {
                --space-section: 3.5rem;
            }
            .hero h1 {
                font-size: 2.8rem;
            }
            .hero-stats {
                gap: 1.5rem;
                flex-wrap: wrap;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .hero {
                min-height: 70vh;
                padding: 4rem 1.2rem 3rem;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats .stat-number {
                font-size: 1.4rem;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .featured-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .container {
                padding: 0 1.2rem;
            }
            .cta-box {
                padding: 2.5rem 1.5rem;
            }
            :root {
                --space-section: 2.8rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .intro-features {
                grid-template-columns: 1fr;
            }
            .faq-question {
                padding: 1rem 1.2rem;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 1.2rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 1.2rem;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
                text-align: center;
            }
            .hero-stats {
                flex-direction: column;
                gap: 0.8rem;
            }
            .hero-stats .stat-item {
                flex-direction: row;
                align-items: baseline;
                gap: 0.5rem;
            }
            .hero-stats .stat-number {
                font-size: 1.2rem;
            }
            .badge {
                font-size: 0.65rem;
                padding: 0.15rem 0.6rem;
            }
            .cta-box h2 {
                font-size: 1.3rem;
            }
            .category-card {
                padding: 1.4rem 1.2rem;
            }
            .featured-card {
                padding: 1.5rem 1.2rem;
            }
            .post-card .post-body {
                padding: 1.2rem;
            }
        }

        /* ===== Scrollbar ===== */
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.08);
            border-radius: 10px;
        }
        .sidebar::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.12);
        }

        /* ===== Selection ===== */
        ::selection {
            background: rgba(240, 180, 41, 0.25);
            color: #fff;
        }

        /* ===== Animation ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .hero-content {
            animation: fadeInUp 0.8s ease-out;
        }
        .section-header {
            animation: fadeInUp 0.6s ease-out;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --primary-dark: #0f0f1a;
            --accent: #e94560;
            --accent-hover: #ff6b81;
            --accent-glow: rgba(233, 69, 96, 0.3);
            --gold: #f0c040;
            --gold-light: #f5d84a;
            --bg-body: #0a0a14;
            --bg-card: #12121f;
            --bg-card-hover: #1a1a2e;
            --bg-section: #0e0e1a;
            --bg-section-alt: #14142a;
            --text-primary: #f0f0f5;
            --text-secondary: #a0a0b8;
            --text-muted: #6a6a88;
            --border-color: #2a2a45;
            --border-glow: rgba(233, 69, 96, 0.15);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.6);
            --shadow-accent: 0 4px 24px rgba(233, 69, 96, 0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --sidebar-width: 240px;
            --header-height: 0px;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

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

        a {
            color: var(--gold);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--gold-light);
            text-shadow: 0 0 12px rgba(240, 192, 64, 0.3);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

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

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

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

        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.15rem;
        }

        /* ===== Layout: Sidebar + Main ===== */
        .app-wrapper {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary-dark);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            padding: 0;
            transition: var(--transition);
        }

        .sidebar-brand {
            padding: 24px 20px 16px;
            display: flex;
            align-items: center;
            gap: 12px;
            border-bottom: 1px solid var(--border-color);
        }

        .sidebar-brand .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--accent), var(--gold));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 0 20px var(--accent-glow);
        }

        .sidebar-brand .logo-text {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
        }
        .sidebar-brand .logo-text span {
            color: var(--accent);
        }

        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .sidebar-nav .nav-item:hover {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-primary);
        }
        .sidebar-nav .nav-item:hover i {
            color: var(--gold);
        }
        .sidebar-nav .nav-item.active {
            background: rgba(233, 69, 96, 0.12);
            color: var(--accent);
            border-left: 3px solid var(--accent);
            box-shadow: 0 0 20px rgba(233, 69, 96, 0.08);
        }
        .sidebar-nav .nav-item.active i {
            color: var(--accent);
        }

        .sidebar-nav .nav-divider {
            height: 1px;
            background: var(--border-color);
            margin: 8px 12px;
            opacity: 0.5;
        }

        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-color);
            font-size: 0.75rem;
            color: var(--text-muted);
            line-height: 1.6;
            text-align: left;
        }
        .sidebar-footer a {
            color: var(--text-muted);
        }
        .sidebar-footer a:hover {
            color: var(--gold);
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Mobile Header (hidden on desktop) ===== */
        .mobile-header {
            display: none;
            background: var(--primary-dark);
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .mobile-header .logo-text {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
        }
        .mobile-header .logo-text span {
            color: var(--accent);
        }
        .mobile-toggle {
            background: none;
            color: var(--text-primary);
            font-size: 1.4rem;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: 80px 40px 60px;
            background: var(--bg-section-alt);
            border-bottom: 1px solid var(--border-color);
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            pointer-events: none;
        }
        .page-banner .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 10, 20, 0.85) 0%, rgba(20, 20, 42, 0.7) 100%);
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            max-width: 1100px;
            margin: 0 auto;
        }
        .page-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            margin-bottom: 12px;
            background: linear-gradient(135deg, #fff, var(--gold));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-banner p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.8;
        }
        .page-banner .banner-badge {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(233, 69, 96, 0.15);
            border: 1px solid rgba(233, 69, 96, 0.25);
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--accent);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Section Spacing ===== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-dark {
            background: var(--primary-dark);
        }

        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }
        .section-header h2 {
            margin-bottom: 12px;
            font-size: 2rem;
        }
        .section-header p {
            color: var(--text-secondary);
            font-size: 1.05rem;
        }
        .section-header .section-tag {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(240, 192, 64, 0.1);
            border: 1px solid rgba(240, 192, 64, 0.2);
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--gold);
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        /* ===== Cards Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(233, 69, 96, 0.25);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md), 0 0 30px rgba(233, 69, 96, 0.05);
        }
        .card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(233, 69, 96, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent);
            margin-bottom: 16px;
            transition: var(--transition);
        }
        .card:hover .card-icon {
            background: rgba(233, 69, 96, 0.2);
            box-shadow: 0 0 24px var(--accent-glow);
        }
        .card h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            padding: 2px 12px;
            background: rgba(240, 192, 64, 0.08);
            border-radius: 12px;
            font-size: 0.75rem;
            color: var(--gold);
            margin-top: 12px;
        }
        .card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-size: 0.9rem;
            color: var(--accent);
            font-weight: 600;
            transition: var(--transition);
        }
        .card .card-link i {
            transition: var(--transition);
        }
        .card .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Cover Card (image) ===== */
        .cover-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .cover-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(233, 69, 96, 0.2);
        }
        .cover-card .cover-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
            transition: var(--transition);
        }
        .cover-card:hover .cover-img {
            transform: scale(1.03);
        }
        .cover-card .cover-body {
            padding: 20px 22px 24px;
        }
        .cover-card .cover-body h3 {
            font-size: 1.1rem;
            margin-bottom: 6px;
        }
        .cover-card .cover-body p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .cover-card .cover-body .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ===== Article List ===== */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .article-item {
            display: flex;
            align-items: stretch;
            gap: 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            transition: var(--transition);
            cursor: default;
        }
        .article-item:hover {
            background: var(--bg-card-hover);
            border-color: rgba(233, 69, 96, 0.15);
            box-shadow: var(--shadow-sm);
        }
        .article-item .article-index {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--accent);
            opacity: 0.6;
            flex-shrink: 0;
        }
        .article-item .article-content {
            flex: 1;
        }
        .article-item .article-content h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
            transition: var(--transition);
        }
        .article-item:hover .article-content h4 {
            color: var(--gold);
        }
        .article-item .article-content p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-item .article-content .meta {
            display: flex;
            gap: 16px;
            margin-top: 8px;
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        .article-item .article-content .meta i {
            margin-right: 4px;
        }
        .article-item .article-link {
            display: flex;
            align-items: center;
            padding-left: 16px;
            border-left: 1px solid var(--border-color);
            color: var(--text-muted);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .article-item:hover .article-link {
            color: var(--accent);
        }

        /* ===== Stats / Data Block ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: center;
            transition: var(--transition);
        }
        .stat-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(240, 192, 64, 0.15);
            transform: translateY(-2px);
        }
        .stat-card .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--gold), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-card .stat-label {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-top: 4px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(233, 69, 96, 0.15);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            background: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.03);
        }
        .faq-question i {
            color: var(--accent);
            transition: var(--transition);
            font-size: 0.9rem;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-section-alt);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            text-align: center;
            padding: 70px 24px;
        }
        .cta-section h2 {
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: var(--text-secondary);
            max-width: 540px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            text-decoration: none;
            border: none;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), #d63851);
            color: #fff;
            box-shadow: 0 4px 20px var(--accent-glow);
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--accent-hover), var(--accent));
            box-shadow: 0 8px 32px var(--accent-glow);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: var(--text-muted);
            color: var(--text-primary);
            transform: translateY(-2px);
        }

        /* ===== Footer (shared) ===== */
        .site-footer {
            background: var(--primary-dark);
            border-top: 1px solid var(--border-color);
            padding: 50px 40px 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            max-width: 1100px;
            margin: 0 auto;
        }
        .footer-brand .logo-text {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .footer-brand .logo-text span {
            color: var(--accent);
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            color: var(--text-primary);
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.88rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--gold);
            padding-left: 4px;
        }
        .footer-bottom {
            max-width: 1100px;
            margin: 32px auto 0;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--gold);
        }
        .footer-social {
            display: flex;
            gap: 16px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: rgba(233, 69, 96, 0.15);
            color: var(--accent);
            transform: translateY(-2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                width: 260px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .page-banner {
                padding: 60px 24px 40px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .article-item {
                flex-direction: column;
                gap: 12px;
                padding: 18px;
            }
            .article-item .article-index {
                width: auto;
                font-size: 1rem;
            }
            .article-item .article-link {
                border-left: none;
                padding-left: 0;
                justify-content: flex-end;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section {
                padding: 50px 0;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
            .container {
                padding: 0 18px;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px 14px;
            }
            .cover-card .cover-img {
                height: 160px;
            }
        }

        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 20px 12px;
            }
            .stat-card .stat-number {
                font-size: 1.8rem;
            }
            .card {
                padding: 20px 18px;
            }
            .cover-card .cover-body {
                padding: 16px 18px 20px;
            }
            .footer-grid {
                gap: 24px;
            }
            .site-footer {
                padding: 36px 20px 20px;
            }
        }

        /* ===== Mobile sidebar overlay ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 999;
        }
        .sidebar-overlay.active {
            display: block;
        }

        @media (max-width: 768px) {
            .sidebar-overlay.active {
                display: block;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --accent: #e94560;
            --accent-hover: #d63850;
            --accent-glow: rgba(233, 69, 96, 0.35);
            --gold: #f5a623;
            --gold-light: #f7c948;
            --bg-dark: #0f0f1a;
            --bg-card: #1a1a2e;
            --bg-card-hover: #222240;
            --bg-section: #12121f;
            --bg-section-alt: #1a1a2e;
            --text-main: #e8e8f0;
            --text-secondary: #9a9ab0;
            --text-muted: #6a6a80;
            --border-color: #2a2a44;
            --border-light: #3a3a55;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.15);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
            --sidebar-width: 240px;
            --header-height: 0px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-dark);
            min-height: 100vh;
            display: flex;
        }
        a {
            color: var(--gold);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--gold-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
        }
        p {
            margin-bottom: 1rem;
            color: var(--text-secondary);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Layout ===== */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
            width: 100%;
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-color);
        }
        .logo-icon {
            font-size: 28px;
            color: var(--gold);
            flex-shrink: 0;
            line-height: 1;
        }
        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: 0.5px;
        }
        .logo-text span {
            color: var(--accent);
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            cursor: pointer;
            text-decoration: none;
        }
        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            flex-shrink: 0;
        }
        .sidebar-nav .nav-item:hover {
            background: rgba(233, 69, 96, 0.08);
            color: var(--text-main);
        }
        .sidebar-nav .nav-item.active {
            background: rgba(233, 69, 96, 0.15);
            color: var(--accent);
            box-shadow: inset 3px 0 0 var(--accent);
        }
        .nav-divider {
            height: 1px;
            background: var(--border-color);
            margin: 8px 16px;
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-color);
            font-size: 12px;
            color: var(--text-muted);
            line-height: 1.6;
            text-align: center;
        }
        .sidebar-footer a {
            color: var(--text-muted);
        }
        .sidebar-footer a:hover {
            color: var(--gold);
        }

        /* ===== Main Content ===== */
        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background: var(--bg-dark);
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 999;
            background: var(--primary);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .mobile-header .logo-text {
            font-size: 16px;
        }
        .mobile-menu-btn {
            background: none;
            border: none;
            color: var(--text-main);
            font-size: 22px;
            cursor: pointer;
            padding: 6px 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .mobile-menu-btn:hover {
            background: rgba(233, 69, 96, 0.1);
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            z-index: 998;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
        }

        /* ===== Article Hero ===== */
        .article-hero {
            background: var(--bg-section);
            padding: 48px 0 32px;
            border-bottom: 1px solid var(--border-color);
            position: relative;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.06;
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--gold);
        }
        .breadcrumb .sep {
            color: var(--border-light);
            font-size: 10px;
        }
        .breadcrumb .current {
            color: var(--text-secondary);
        }
        .article-hero h1 {
            font-size: clamp(28px, 4vw, 44px);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px 32px;
            font-size: 14px;
            color: var(--text-muted);
            align-items: center;
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-item i {
            font-size: 13px;
            color: var(--accent);
        }
        .article-meta .category-badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            color: #fff;
            background: var(--accent);
            letter-spacing: 0.3px;
        }

        /* ===== Article Body ===== */
        .article-body {
            padding: 40px 0 48px;
            background: var(--bg-dark);
        }
        .article-body .container {
            max-width: 860px;
        }
        .article-cover {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 36px;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
        }
        .article-cover img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
        }
        .article-content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-secondary);
        }
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            color: var(--text-main);
            margin-top: 36px;
            margin-bottom: 16px;
            font-weight: 700;
        }
        .article-content h2 {
            font-size: 26px;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 10px;
        }
        .article-content h3 {
            font-size: 21px;
        }
        .article-content p {
            margin-bottom: 1.2rem;
            color: var(--text-secondary);
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 1.2rem;
            padding-left: 24px;
            color: var(--text-secondary);
        }
        .article-content ul li {
            list-style: disc;
            margin-bottom: 6px;
        }
        .article-content ol li {
            list-style: decimal;
            margin-bottom: 6px;
        }
        .article-content a {
            color: var(--gold);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--gold-light);
        }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            padding: 12px 20px;
            margin: 24px 0;
            background: rgba(233, 69, 96, 0.05);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-content img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            border: 1px solid var(--border-color);
        }
        .article-content code {
            font-family: var(--font-mono);
            background: rgba(233, 69, 96, 0.1);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 14px;
            color: var(--accent);
        }
        .article-content pre {
            background: var(--primary);
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 24px 0;
            border: 1px solid var(--border-color);
            font-family: var(--font-mono);
            font-size: 14px;
            color: var(--text-main);
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 36px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }
        .article-tags .tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }

        /* ===== Article Navigation ===== */
        .article-nav {
            padding: 24px 0 32px;
            border-top: 1px solid var(--border-color);
            margin-top: 32px;
        }
        .article-nav-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .article-nav-item {
            display: flex;
            flex-direction: column;
            gap: 6px;
            padding: 18px 22px;
            border-radius: var(--radius-md);
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .article-nav-item:hover {
            background: var(--bg-card-hover);
            border-color: var(--accent);
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
        }
        .article-nav-item .nav-label {
            font-size: 12px;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .article-nav-item .nav-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .article-nav-item.next {
            text-align: right;
        }
        .article-nav-item.next .nav-label {
            justify-content: flex-end;
        }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 48px 0;
            background: var(--bg-section);
            border-top: 1px solid var(--border-color);
        }
        .related-section .section-title {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }
        .related-section .section-sub {
            color: var(--text-muted);
            font-size: 15px;
            margin-bottom: 32px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent);
            box-shadow: var(--shadow-glow);
            background: var(--bg-card-hover);
        }
        .related-card .card-img {
            aspect-ratio: 16/10;
            overflow: hidden;
            background: var(--primary);
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-cat {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            margin-bottom: 6px;
            letter-spacing: 0.3px;
        }
        .related-card .card-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-meta {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: auto;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 64px 0;
            background: var(--bg-section-alt);
            text-align: center;
            border-top: 1px solid var(--border-color);
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            opacity: 0.04;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: clamp(24px, 3.5vw, 36px);
            font-weight: 800;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .cta-section p {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 20px rgba(233, 69, 96, 0.3);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(233, 69, 96, 0.4);
            color: #fff;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-main);
            border: 2px solid var(--border-color);
        }
        .btn-secondary:hover {
            border-color: var(--gold);
            color: var(--gold);
            transform: translateY(-2px);
            background: rgba(245, 166, 35, 0.05);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo-text {
            font-size: 20px;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 0;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--gold);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-muted);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--gold);
        }
        .footer-social {
            display: flex;
            gap: 16px;
        }
        .footer-social a {
            font-size: 18px;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-social a:hover {
            color: var(--gold);
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-box .icon {
            font-size: 64px;
            color: var(--accent);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 28px;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .mobile-overlay.active {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .article-hero {
                padding: 32px 0 24px;
            }
            .article-hero h1 {
                font-size: 24px;
            }
            .article-meta {
                gap: 12px 20px;
                font-size: 13px;
            }
            .article-body {
                padding: 24px 0 32px;
            }
            .article-content {
                font-size: 15px;
            }
            .article-nav-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .cta-section {
                padding: 40px 0;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 320px;
                justify-content: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-hero h1 {
                font-size: 20px;
            }
            .article-meta {
                font-size: 12px;
                gap: 8px 14px;
            }
            .article-content {
                font-size: 14px;
                line-height: 1.8;
            }
            .article-tags .tag {
                font-size: 12px;
                padding: 4px 12px;
            }
            .related-card .card-title {
                font-size: 15px;
            }
            .cta-section h2 {
                font-size: 20px;
            }
            .not-found-box .icon {
                font-size: 48px;
            }
            .not-found-box h2 {
                font-size: 22px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-light);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== Focus ===== */
        :focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }