/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --clr-primary: #00d4ff;
            --clr-primary-glow: rgba(0, 212, 255, 0.35);
            --clr-primary-dim: #009dbe;
            --clr-secondary: #8b5cf6;
            --clr-secondary-glow: rgba(139, 92, 246, 0.35);
            --clr-accent: #f59e0b;
            --clr-bg-dark: #0a0a0f;
            --clr-bg-card: #12121a;
            --clr-bg-elevated: #1a1a28;
            --clr-bg-section: #0e0e16;
            --clr-text-primary: #f1f5f9;
            --clr-text-secondary: #94a3b8;
            --clr-text-muted: #64748b;
            --clr-border: rgba(255, 255, 255, 0.06);
            --clr-border-light: rgba(255, 255, 255, 0.12);
            --clr-success: #10b981;
            --clr-danger: #ef4444;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(0, 0, 0, 0.3);
            --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
            --shadow-glow-secondary: 0 0 30px rgba(139, 92, 246, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --container-max: 1200px;
            --nav-height: 72px;
        }

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

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

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

        a {
            color: var(--clr-primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--clr-secondary);
        }
        a:focus-visible {
            outline: 2px solid var(--clr-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible {
            outline: 2px solid var(--clr-primary);
            outline-offset: 3px;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== Typography ===== */
        .h1 {
            font-size: clamp(2.2rem, 5.5vw, 4rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.02em;
        }
        .h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.6rem);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
        }
        .h3 {
            font-size: clamp(1.15rem, 2vw, 1.5rem);
            font-weight: 600;
            line-height: 1.35;
        }
        .h4 {
            font-size: 1.1rem;
            font-weight: 600;
            line-height: 1.4;
        }
        .text-sm {
            font-size: 0.875rem;
        }
        .text-xs {
            font-size: 0.75rem;
        }
        .text-muted {
            color: var(--clr-text-secondary);
        }
        .text-muted-dim {
            color: var(--clr-text-muted);
        }
        .text-center {
            text-align: center;
        }

        /* ===== Section Spacing ===== */
        .section {
            padding: 80px 0;
        }
        .section-sm {
            padding: 48px 0;
        }
        .section-lg {
            padding: 100px 0;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--clr-primary);
            margin-bottom: 16px;
        }
        .section-label::before {
            content: '';
            width: 28px;
            height: 2px;
            background: var(--clr-primary);
            border-radius: 2px;
        }

        .section-title {
            margin-bottom: 16px;
        }
        .section-desc {
            max-width: 680px;
            margin: 0 auto 48px;
            color: var(--clr-text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
        }
        .section-desc-left {
            max-width: 680px;
            margin: 0 0 48px;
        }

        /* ===== Header & Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(10, 10, 15, 0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--clr-border);
            transition: background var(--transition), border-color var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10, 10, 15, 0.96);
            border-bottom-color: rgba(0, 212, 255, 0.15);
        }

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

        /* Logo */
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--clr-text-primary);
            letter-spacing: -0.02em;
            flex-shrink: 0;
        }
        .logo:hover {
            color: var(--clr-primary);
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            border-radius: var(--radius-sm);
            font-size: 1.1rem;
            color: #fff;
            flex-shrink: 0;
        }
        .logo-text {
            background: linear-gradient(135deg, var(--clr-text-primary), var(--clr-primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* Nav Desktop */
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--clr-text-secondary);
            transition: all var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav-list a i {
            font-size: 0.8rem;
            opacity: 0.7;
        }
        .nav-list a:hover {
            color: var(--clr-text-primary);
            background: rgba(255, 255, 255, 0.05);
        }
        .nav-list a.active {
            color: var(--clr-primary);
            background: rgba(0, 212, 255, 0.08);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.08);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--clr-primary);
            border-radius: 2px;
            box-shadow: 0 0 12px var(--clr-primary-glow);
        }

        /* Nav CTA */
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .nav-cta .btn-nav {
            padding: 8px 20px;
            border-radius: 100px;
            font-size: 0.85rem;
            font-weight: 600;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dim));
            color: #0a0a0f;
            transition: all var(--transition);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.15);
        }
        .nav-cta .btn-nav:hover {
            transform: translateY(-1px);
            box-shadow: 0 0 35px rgba(0, 212, 255, 0.3);
            color: #0a0a0f;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            padding: 8px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.04);
            cursor: pointer;
            flex-shrink: 0;
        }
        .hamburger span {
            display: block;
            height: 2px;
            background: var(--clr-text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* Mobile Menu */
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 10, 15, 0.98);
            backdrop-filter: blur(30px);
            padding: 32px 24px;
            flex-direction: column;
            gap: 12px;
            overflow-y: auto;
            z-index: 999;
            border-top: 1px solid var(--clr-border);
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 20px;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 500;
            color: var(--clr-text-secondary);
            background: rgba(255, 255, 255, 0.02);
            transition: all var(--transition);
        }
        .mobile-menu a i {
            width: 24px;
            text-align: center;
            color: var(--clr-primary);
        }
        .mobile-menu a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--clr-text-primary);
        }
        .mobile-menu a.active {
            color: var(--clr-primary);
            background: rgba(0, 212, 255, 0.08);
            border-left: 3px solid var(--clr-primary);
        }
        .mobile-menu .mobile-cta {
            margin-top: 16px;
            padding: 14px 20px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dim));
            color: #0a0a0f;
            font-weight: 700;
            text-align: center;
        }
        .mobile-menu .mobile-cta:hover {
            color: #0a0a0f;
            transform: translateY(-1px);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            white-space: nowrap;
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dim));
            color: #0a0a0f;
            box-shadow: 0 0 25px rgba(0, 212, 255, 0.2);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 45px rgba(0, 212, 255, 0.35);
            color: #0a0a0f;
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.06);
            color: var(--clr-text-primary);
            border: 1px solid var(--clr-border-light);
            backdrop-filter: blur(4px);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            transform: translateY(-2px);
            color: var(--clr-text-primary);
            border-color: var(--clr-primary);
        }
        .btn-outline {
            background: transparent;
            color: var(--clr-primary);
            border: 1.5px solid var(--clr-primary);
        }
        .btn-outline:hover {
            background: rgba(0, 212, 255, 0.08);
            transform: translateY(-2px);
            color: var(--clr-primary);
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.12);
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.05rem;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.8rem;
        }
        .btn-block {
            width: 100%;
        }

        /* ===== Badges & Tags ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .badge-primary {
            background: rgba(0, 212, 255, 0.12);
            color: var(--clr-primary);
        }
        .badge-secondary {
            background: rgba(139, 92, 246, 0.12);
            color: var(--clr-secondary);
        }
        .badge-accent {
            background: rgba(245, 158, 11, 0.12);
            color: var(--clr-accent);
        }
        .badge-success {
            background: rgba(16, 185, 129, 0.12);
            color: var(--clr-success);
        }
        .badge-sm {
            padding: 2px 10px;
            font-size: 0.7rem;
        }
        .badge-outline {
            background: transparent;
            border: 1px solid var(--clr-border-light);
            color: var(--clr-text-secondary);
        }

        .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 6px 14px;
            border-radius: var(--radius-sm);
            font-size: 0.78rem;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.04);
            color: var(--clr-text-secondary);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .tag:hover {
            background: rgba(0, 212, 255, 0.06);
            color: var(--clr-primary);
            border-color: rgba(0, 212, 255, 0.2);
        }

        /* ===== Card ===== */
        .card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card:hover {
            border-color: rgba(255, 255, 255, 0.08);
            box-shadow: var(--shadow-card), var(--shadow-glow);
            transform: translateY(-3px);
        }
        .card-body {
            padding: 24px;
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .card-img-top {
            border-radius: var(--radius-md) var(--radius-md) 0 0;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: var(--nav-height);
            overflow: hidden;
            background: var(--clr-bg-dark);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
        }
        .hero-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.4;
        }
        .hero-bg .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 10, 15, 0.92) 30%, rgba(10, 10, 15, 0.6) 60%, rgba(10, 10, 15, 0.85) 100%);
        }
        .hero-bg .glow-top {
            position: absolute;
            top: -20%;
            right: -10%;
            width: 60%;
            height: 80%;
            background: radial-gradient(ellipse, rgba(0, 212, 255, 0.12), transparent 70%);
            pointer-events: none;
        }
        .hero-bg .glow-bottom {
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 50%;
            height: 70%;
            background: radial-gradient(ellipse, rgba(139, 92, 246, 0.1), transparent 70%);
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 760px;
            padding: 40px 0 60px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px 6px 12px;
            border-radius: 100px;
            background: rgba(0, 212, 255, 0.08);
            border: 1px solid rgba(0, 212, 255, 0.15);
            font-size: 0.8rem;
            color: var(--clr-primary);
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            font-size: 0.7rem;
        }
        .hero h1 {
            margin-bottom: 20px;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            color: var(--clr-text-secondary);
            max-width: 600px;
            line-height: 1.9;
            margin-bottom: 36px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 32px 48px;
            margin-top: 48px;
            padding-top: 36px;
            border-top: 1px solid var(--clr-border);
        }
        .hero-stat h4 {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--clr-text-primary);
            letter-spacing: -0.02em;
        }
        .hero-stat h4 span {
            color: var(--clr-primary);
        }
        .hero-stat p {
            font-size: 0.85rem;
            color: var(--clr-text-muted);
            margin-bottom: 0;
        }

        /* ===== Features / Intro ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .intro-card {
            padding: 32px 28px;
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .intro-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .intro-card:hover::before {
            opacity: 1;
        }
        .intro-card:hover {
            border-color: rgba(255, 255, 255, 0.08);
            box-shadow: var(--shadow-card);
            transform: translateY(-4px);
        }
        .intro-icon {
            width: 52px;
            height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            font-size: 1.3rem;
            margin-bottom: 20px;
        }
        .intro-icon.blue {
            background: rgba(0, 212, 255, 0.1);
            color: var(--clr-primary);
        }
        .intro-icon.purple {
            background: rgba(139, 92, 246, 0.1);
            color: var(--clr-secondary);
        }
        .intro-icon.gold {
            background: rgba(245, 158, 11, 0.1);
            color: var(--clr-accent);
        }
        .intro-icon.green {
            background: rgba(16, 185, 129, 0.1);
            color: var(--clr-success);
        }
        .intro-card h3 {
            margin-bottom: 12px;
        }
        .intro-card p {
            color: var(--clr-text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ===== Category Cards ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            display: block;
            color: inherit;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card), var(--shadow-glow);
            border-color: rgba(0, 212, 255, 0.15);
            color: inherit;
        }
        .category-card img {
            width: 100%;
            aspect-ratio: 16 / 11;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .category-card:hover img {
            transform: scale(1.04);
        }
        .category-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10, 10, 15, 0.9) 0%, rgba(10, 10, 15, 0.1) 60%, transparent 100%);
            pointer-events: none;
        }
        .category-info {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 24px;
            pointer-events: none;
        }
        .category-info h3 {
            color: #fff;
            margin-bottom: 4px;
        }
        .category-info p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.85rem;
        }
        .category-info .badge {
            margin-bottom: 10px;
            pointer-events: auto;
        }

        /* ===== Posts / News List ===== */
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .post-card {
            display: flex;
            flex-direction: column;
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .post-card:hover {
            border-color: rgba(255, 255, 255, 0.08);
            box-shadow: var(--shadow-card);
            transform: translateY(-3px);
        }
        .post-card .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
        }
        .post-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .post-card:hover .card-img-wrap img {
            transform: scale(1.04);
        }
        .post-card .card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.78rem;
            color: var(--clr-text-muted);
            margin-bottom: 10px;
        }
        .post-card .post-meta .badge {
            font-size: 0.7rem;
        }
        .post-card h3 {
            font-size: 1.05rem;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card h3 a {
            color: var(--clr-text-primary);
        }
        .post-card h3 a:hover {
            color: var(--clr-primary);
        }
        .post-card p {
            color: var(--clr-text-secondary);
            font-size: 0.88rem;
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .post-card .post-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.78rem;
            color: var(--clr-text-muted);
            padding-top: 12px;
            border-top: 1px solid var(--clr-border);
            margin-top: auto;
        }
        .post-card .post-footer a {
            font-weight: 500;
            font-size: 0.8rem;
        }

        .empty-posts {
            grid-column: 1 / -1;
            padding: 48px 24px;
            text-align: center;
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--clr-border);
            color: var(--clr-text-muted);
        }
        .empty-posts i {
            font-size: 2rem;
            color: var(--clr-primary);
            opacity: 0.4;
            margin-bottom: 16px;
        }

        /* ===== Stats / Numbers ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 24px;
        }
        .stat-card {
            text-align: center;
            padding: 36px 20px;
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .stat-card:hover {
            border-color: rgba(0, 212, 255, 0.12);
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .stat-card .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-card p {
            color: var(--clr-text-secondary);
            font-size: 0.9rem;
            margin-top: 8px;
        }
        .stat-card .stat-icon {
            font-size: 1.8rem;
            color: var(--clr-primary);
            opacity: 0.2;
            margin-bottom: 12px;
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            position: relative;
        }
        .process-step {
            text-align: center;
            padding: 32px 20px;
            position: relative;
        }
        .process-step .step-number {
            width: 56px;
            height: 56px;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-size: 1.3rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dim));
            color: #0a0a0f;
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.2);
        }
        .process-step h3 {
            margin-bottom: 8px;
        }
        .process-step p {
            color: var(--clr-text-secondary);
            font-size: 0.88rem;
            line-height: 1.6;
        }
        .process-step .step-line {
            display: none;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(255, 255, 255, 0.08);
        }
        .faq-item.active {
            border-color: rgba(0, 212, 255, 0.15);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 20px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--clr-text-primary);
            text-align: left;
            background: none;
            border: none;
            cursor: pointer;
            gap: 16px;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--clr-primary);
        }
        .faq-question i {
            font-size: 0.8rem;
            color: var(--clr-text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--clr-primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--clr-text-secondary);
            font-size: 0.92rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--clr-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--clr-border);
            padding: 60px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 60%;
            height: 200%;
            background: radial-gradient(ellipse, rgba(0, 212, 255, 0.06), transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 {
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--clr-text-secondary);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--clr-bg-card);
            border-top: 1px solid var(--clr-border);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p {
            color: var(--clr-text-secondary);
            font-size: 0.9rem;
            max-width: 320px;
            margin-top: 12px;
            line-height: 1.7;
        }
        .footer-brand .logo {
            margin-bottom: 8px;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            color: var(--clr-text-primary);
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: var(--clr-text-secondary);
            font-size: 0.88rem;
            transition: color var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a i {
            font-size: 0.65rem;
            opacity: 0.5;
        }
        .footer-col ul li a:hover {
            color: var(--clr-primary);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            padding-top: 24px;
            border-top: 1px solid var(--clr-border);
            font-size: 0.82rem;
            color: var(--clr-text-muted);
        }
        .footer-bottom a {
            color: var(--clr-text-muted);
        }
        .footer-bottom a:hover {
            color: var(--clr-primary);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            color: var(--clr-text-secondary);
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 1px solid var(--clr-border);
        }
        .footer-social a:hover {
            background: rgba(0, 212, 255, 0.1);
            color: var(--clr-primary);
            border-color: rgba(0, 212, 255, 0.2);
            transform: translateY(-2px);
        }

        /* ===== Section with Background Image ===== */
        .section-bg-image {
            position: relative;
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
        }
        .section-bg-image .section-overlay {
            position: absolute;
            inset: 0;
            background: rgba(10, 10, 15, 0.85);
            pointer-events: none;
        }
        .section-bg-image .container {
            position: relative;
            z-index: 1;
        }

        /* ===== Divider ===== */
        .section-divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--clr-border-light), transparent);
            margin: 0;
            border: none;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--clr-bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.08);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.15);
        }

        /* ===== Selection ===== */
        ::selection {
            background: rgba(0, 212, 255, 0.25);
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .hero-stats {
                gap: 24px 32px;
            }
        }

        @media (max-width: 768px) {
            .nav-list {
                display: none;
            }
            .nav-cta .btn-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }

            .hero {
                min-height: 90vh;
            }
            .hero-content {
                padding: 20px 0 40px;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 20px 24px;
                margin-top: 32px;
                padding-top: 24px;
            }
            .hero-stat h4 {
                font-size: 1.3rem;
            }

            .section {
                padding: 56px 0;
            }
            .section-lg {
                padding: 64px 0;
            }
            .section-sm {
                padding: 32px 0;
            }

            .intro-grid,
            .category-grid,
            .posts-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .cta-section {
                padding: 40px 24px;
                border-radius: var(--radius-md);
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .faq-question {
                padding: 16px 18px;
                font-size: 0.92rem;
            }
            .faq-answer {
                font-size: 0.85rem;
            }
            .faq-item.active .faq-answer {
                padding: 0 18px 16px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 0.92rem;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }
            .hero-stat {
                text-align: center;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 24px 12px;
            }
            .stat-card .stat-number {
                font-size: 1.6rem;
            }

            .section {
                padding: 40px 0;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .section-desc {
                font-size: 0.9rem;
                margin-bottom: 32px;
            }

            .intro-card {
                padding: 24px 20px;
            }
            .card-body {
                padding: 18px;
            }

            .cta-section {
                padding: 32px 18px;
            }
            .cta-actions {
                flex-direction: column;
                width: 100%;
            }
            .cta-actions .btn {
                width: 100%;
                justify-content: center;
            }

            .footer-grid {
                gap: 24px;
            }
            .footer-col ul li {
                margin-bottom: 8px;
            }
            .footer-social a {
                width: 34px;
                height: 34px;
                font-size: 0.85rem;
            }

            .mobile-menu a {
                padding: 12px 16px;
                font-size: 0.92rem;
            }
        }

        /* ===== Animations ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-in {
            animation: fadeInUp 0.6s ease forwards;
        }
        .animate-delay-1 {
            animation-delay: 0.1s;
        }
        .animate-delay-2 {
            animation-delay: 0.2s;
        }
        .animate-delay-3 {
            animation-delay: 0.3s;
        }
        .animate-delay-4 {
            animation-delay: 0.4s;
        }

        /* ===== Accessibility ===== */
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
            }
            html {
                scroll-behavior: auto;
            }
        }

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

        .gap-8 {
            gap: 8px;
        }
        .gap-12 {
            gap: 12px;
        }
        .gap-16 {
            gap: 16px;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-between {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #f0c040;
            --primary-dark: #d4a830;
            --primary-glow: rgba(240, 192, 64, 0.35);
            --primary-light: rgba(240, 192, 64, 0.12);
            --bg-dark: #0b0d11;
            --bg-card: #13171d;
            --bg-card-hover: #1a1f28;
            --bg-section: #0f1218;
            --bg-elevated: #181e26;
            --text-primary: #f0f2f5;
            --text-secondary: #9aa4b8;
            --text-muted: #5f6b80;
            --border-color: #1e2630;
            --border-light: #2a3340;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(240, 192, 64, 0.05);
            --shadow-glow: 0 0 30px rgba(240, 192, 64, 0.08);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-width: 1200px;
            --header-height: 72px;
        }

        /* ===== 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-family);
            background: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #f5d060;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            letter-spacing: -0.01em;
        }
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(11, 13, 17, 0.92);
            backdrop-filter: blur(18px) saturate(1.2);
            border-bottom: 1px solid var(--border-color);
            transition: background var(--transition), border-color var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: var(--radius-sm);
            color: #0b0d11;
            font-size: 20px;
            box-shadow: 0 0 20px var(--primary-glow);
        }
        .logo-text {
            background: linear-gradient(90deg, #f0f2f5, #c8d0e0);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a i {
            font-size: 15px;
        }
        .nav-list a:hover {
            color: var(--text-primary);
            background: var(--primary-light);
        }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-light);
            box-shadow: inset 0 -2px 0 var(--primary), 0 0 24px var(--primary-glow);
        }
        .nav-list a.active i {
            color: var(--primary);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            background: transparent;
            border: 1px solid var(--border-color);
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Main Content ===== */
        .main-content {
            padding-top: var(--header-height);
            min-height: 80vh;
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            padding: 80px 0 60px;
            background: linear-gradient(135deg, var(--bg-section) 0%, #0a0e14 100%);
            border-bottom: 1px solid var(--border-color);
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a {
            color: var(--text-secondary);
        }
        .article-breadcrumb a:hover {
            color: var(--primary);
        }
        .article-breadcrumb .sep {
            color: var(--text-muted);
            font-size: 12px;
        }
        .article-breadcrumb .current {
            color: var(--primary);
        }
        .article-hero h1 {
            font-size: clamp(28px, 4vw, 48px);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-primary);
            max-width: 900px;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 28px;
            align-items: center;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .article-meta .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
        }
        .article-meta .badge i {
            font-size: 12px;
        }
        .article-meta .date {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .date i {
            color: var(--text-muted);
        }

        /* ===== Article Body ===== */
        .article-section {
            padding: 60px 0 80px;
            background: var(--bg-dark);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
        }
        .article-body .content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-secondary);
        }
        .article-body .content p {
            margin-bottom: 1.4em;
        }
        .article-body .content h2 {
            font-size: 24px;
            color: var(--text-primary);
            margin: 1.6em 0 0.6em;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }
        .article-body .content h3 {
            font-size: 20px;
            color: var(--text-primary);
            margin: 1.4em 0 0.5em;
        }
        .article-body .content ul,
        .article-body .content ol {
            margin: 0 0 1.4em 1.6em;
        }
        .article-body .content li {
            margin-bottom: 0.5em;
            list-style: disc;
        }
        .article-body .content img {
            margin: 1.6em 0;
            border-radius: var(--radius-md);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 1.6em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body .content a:hover {
            color: #f5d060;
        }
        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-not-found i {
            font-size: 64px;
            color: var(--text-muted);
            margin-bottom: 24px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 28px;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .article-not-found .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
        }
        .sidebar-card h3 {
            font-size: 18px;
            color: var(--text-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-card h3 i {
            color: var(--primary);
            font-size: 16px;
        }
        .sidebar-card .related-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .sidebar-card .related-list a {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-size: 14px;
            transition: all var(--transition);
        }
        .sidebar-card .related-list a:last-child {
            border-bottom: none;
        }
        .sidebar-card .related-list a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .sidebar-card .related-list a i {
            color: var(--primary);
            font-size: 12px;
            margin-top: 4px;
        }
        .sidebar-card .cta-box {
            text-align: center;
            padding: 16px 0 4px;
        }
        .sidebar-card .cta-box p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }
        .sidebar-card .cta-box .btn {
            width: 100%;
            justify-content: center;
        }
        .sidebar-card .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-card .tag-list a {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .sidebar-card .tag-list a:hover {
            background: transparent;
            border-color: var(--primary);
            color: var(--primary);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all var(--transition);
            border: 1px solid transparent;
            background: var(--primary);
            color: #0b0d11;
        }
        .btn:hover {
            background: var(--primary-dark);
            color: #0b0d11;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px var(--primary-glow);
        }
        .btn-outline {
            background: transparent;
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #0b0d11;
            border-color: var(--primary);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }

        /* ===== Related Posts Section ===== */
        .related-section {
            padding: 60px 0 80px;
            background: var(--bg-section);
            border-top: 1px solid var(--border-color);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .related-section .section-subtitle {
            text-align: center;
            color: var(--text-secondary);
            font-size: 16px;
            margin-bottom: 40px;
        }
        .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);
            box-shadow: var(--shadow-card);
        }
        .related-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary-glow);
            box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5), 0 0 0 1px var(--primary-glow);
        }
        .related-card .card-img {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-elevated);
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 20px 22px 24px;
        }
        .related-card .card-body .card-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 3px 12px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .related-card .card-body h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card .card-body h4 a {
            color: var(--text-primary);
        }
        .related-card .card-body h4 a:hover {
            color: var(--primary);
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .card-meta {
            font-size: 12px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 18px;
            letter-spacing: 0.02em;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all var(--transition);
        }
        .footer-col ul li a i {
            font-size: 10px;
            color: var(--text-muted);
        }
        .footer-col ul li a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-col ul li a:hover i {
            color: var(--primary);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 28px;
            border-top: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-muted);
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-bottom a {
            color: var(--text-secondary);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--bg-elevated);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            font-size: 16px;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #0b0d11;
            border-color: var(--primary);
            transform: translateY(-3px);
            box-shadow: 0 6px 20px var(--primary-glow);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(11, 13, 17, 0.98);
                backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 16px 24px 28px;
                border-bottom: 1px solid var(--border-color);
                display: none;
                gap: 2px;
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list a {
                padding: 14px 20px;
                font-size: 16px;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .nav-toggle {
                display: flex;
            }
            .article-hero {
                padding: 60px 0 40px;
            }
            .article-hero h1 {
                font-size: 24px;
            }
            .article-body {
                padding: 24px 20px;
            }
            .article-meta {
                gap: 12px 20px;
                font-size: 13px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-section .section-title {
                font-size: 22px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-body {
                padding: 18px 14px;
            }
            .article-hero h1 {
                font-size: 20px;
            }
            .sidebar-card {
                padding: 20px 16px;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
            .footer-grid {
                gap: 24px;
            }
            .footer-col h4 {
                font-size: 15px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 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);
        }

        /* ===== Selection ===== */
        ::selection {
            background: var(--primary);
            color: #0b0d11;
        }

/* roulang page: category1 */
/* ===== CSS Design Variables ===== */
        :root {
            --primary: #f0c040;
            --primary-dark: #d4a830;
            --primary-light: #fde08a;
            --primary-glow: rgba(240, 192, 64, 0.35);
            --secondary: #1e1e2f;
            --secondary-light: #2a2a3f;
            --bg-dark: #0d0d18;
            --bg-card: #181830;
            --bg-card-hover: #222244;
            --text-main: #f0ece8;
            --text-light: #b8b0a8;
            --text-dim: #7a7470;
            --border-color: #2a2a44;
            --border-glow: rgba(240, 192, 64, 0.15);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 4px 24px rgba(240, 192, 64, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-dark);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-light);
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: #fff;
        }

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            z-index: 1000;
            background: rgba(13, 13, 24, 0.92);
            backdrop-filter: blur(16px) saturate(1.3);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            transition: var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            text-decoration: none;
            transition: var(--transition);
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0d0d18;
            font-size: 20px;
            box-shadow: 0 0 20px var(--primary-glow);
        }
        .logo-text {
            background: linear-gradient(135deg, #fff 60%, var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: 30px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-light);
            text-decoration: none;
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav-list a i {
            font-size: 14px;
            opacity: 0.7;
            transition: var(--transition);
        }
        .nav-list a:hover {
            color: #fff;
            background: rgba(240, 192, 64, 0.08);
        }
        .nav-list a:hover i {
            opacity: 1;
            color: var(--primary);
        }
        .nav-list a.active {
            color: #0d0d18;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            box-shadow: 0 0 24px var(--primary-glow);
        }
        .nav-list a.active i {
            opacity: 1;
            color: #0d0d18;
        }
        .nav-list a.active::after {
            display: none;
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            background: rgba(240, 192, 64, 0.1);
            border-radius: var(--radius-sm);
            color: var(--primary);
            font-size: 22px;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid var(--border-glow);
        }
        .nav-toggle:hover {
            background: rgba(240, 192, 64, 0.2);
        }

        /* ===== Mobile Nav ===== */
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(6px);
            z-index: 998;
        }
        .mobile-nav-overlay.open {
            display: block;
        }

        .mobile-nav-panel {
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            height: 100%;
            background: var(--bg-card);
            border-left: 1px solid var(--border-color);
            z-index: 999;
            padding: 24px 20px;
            display: flex;
            flex-direction: column;
            transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: -8px 0 40px rgba(0, 0, 0, 0.5);
        }
        .mobile-nav-panel.open {
            right: 0;
        }
        .mobile-nav-panel .mobile-nav-close {
            align-self: flex-end;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(240, 192, 64, 0.1);
            color: var(--primary);
            font-size: 20px;
            cursor: pointer;
            transition: var(--transition);
            margin-bottom: 16px;
        }
        .mobile-nav-panel .mobile-nav-close:hover {
            background: rgba(240, 192, 64, 0.25);
        }
        .mobile-nav-list {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .mobile-nav-list a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            font-size: 17px;
            font-weight: 600;
            color: var(--text-light);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .mobile-nav-list a i {
            width: 22px;
            font-size: 16px;
            color: var(--text-dim);
            transition: var(--transition);
        }
        .mobile-nav-list a:hover {
            background: rgba(240, 192, 64, 0.06);
            color: #fff;
        }
        .mobile-nav-list a:hover i {
            color: var(--primary);
        }
        .mobile-nav-list a.active {
            color: #0d0d18;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-color: transparent;
        }
        .mobile-nav-list a.active i {
            color: #0d0d18;
        }

        /* ===== Hero / Banner ===== */
        .page-banner {
            padding: 140px 0 80px;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
            min-height: 360px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(13, 13, 24, 0.92) 40%, rgba(13, 13, 24, 0.6) 80%);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 48px;
            font-weight: 900;
            letter-spacing: -1px;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff 50%, var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-banner p {
            font-size: 18px;
            color: var(--text-light);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .page-banner .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 30px;
            background: rgba(240, 192, 64, 0.12);
            border: 1px solid var(--border-glow);
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }
        .page-banner .banner-badge i {
            font-size: 12px;
        }

        /* ===== Section ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--secondary);
        }
        .section-dark {
            background: var(--bg-dark);
        }
        .section-card-bg {
            background: var(--bg-card);
        }

        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header h2 {
            font-size: 36px;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .section-header h2 i {
            color: var(--primary);
            margin-right: 10px;
        }
        .section-header p {
            font-size: 17px;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .section-header .accent-line {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--primary-dark));
            border-radius: 4px;
            margin: 16px auto 0;
        }

        /* ===== Card ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 24px;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-md), var(--shadow-glow);
            transform: translateY(-4px);
        }
        .card .card-img {
            border-radius: var(--radius-sm);
            overflow: hidden;
            margin: -24px -24px 16px;
            height: 200px;
            background: var(--secondary-light);
        }
        .card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }
        .card .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 20px;
            background: rgba(240, 192, 64, 0.1);
            border: 1px solid var(--border-glow);
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 10px;
        }
        .card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }
        .card h3 a {
            color: inherit;
        }
        .card h3 a:hover {
            color: var(--primary);
        }
        .card p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .card .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-dim);
            margin-top: 8px;
        }
        .card .card-meta i {
            color: var(--primary);
            opacity: 0.6;
        }
        .card .btn-text {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 14px;
            color: var(--primary);
            margin-top: 8px;
            transition: var(--transition);
        }
        .card .btn-text:hover {
            color: var(--primary-light);
            gap: 10px;
        }

        /* ===== Grid ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        /* ===== Button ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            transition: var(--transition);
            text-decoration: none;
            border: none;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0d0d18;
            box-shadow: 0 4px 20px var(--primary-glow);
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            color: #0d0d18;
            box-shadow: 0 8px 32px rgba(240, 192, 64, 0.4);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #0d0d18;
            transform: translateY(-2px);
            box-shadow: 0 4px 20px var(--primary-glow);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 14px;
        }
        .btn-lg {
            padding: 18px 44px;
            font-size: 18px;
        }

        /* ===== Badge ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(240, 192, 64, 0.1);
            border: 1px solid var(--border-glow);
            color: var(--primary);
        }
        .badge i {
            font-size: 12px;
        }
        .badge-hot {
            background: rgba(255, 80, 80, 0.15);
            border-color: rgba(255, 80, 80, 0.25);
            color: #ff6b6b;
        }
        .badge-new {
            background: rgba(80, 200, 120, 0.15);
            border-color: rgba(80, 200, 120, 0.25);
            color: #50c878;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .stat-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }
        .stat-item .stat-number {
            font-size: 40px;
            font-weight: 900;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 15px;
            color: var(--text-light);
            margin-top: 8px;
            font-weight: 500;
        }
        .stat-item .stat-icon {
            font-size: 28px;
            color: var(--primary);
            opacity: 0.5;
            margin-bottom: 8px;
        }

        /* ===== Feature List ===== */
        .feature-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 16px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .feature-list li:hover {
            border-color: var(--border-glow);
            background: var(--bg-card-hover);
        }
        .feature-list li i {
            color: var(--primary);
            font-size: 18px;
            margin-top: 2px;
            flex-shrink: 0;
        }
        .feature-list li strong {
            color: #fff;
            font-weight: 700;
        }
        .feature-list li span {
            color: var(--text-light);
            font-size: 15px;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            padding: 20px 24px;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-weight: 700;
            font-size: 16px;
            color: #fff;
        }
        .faq-item .faq-q i {
            color: var(--primary);
            font-size: 14px;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item .faq-a {
            margin-top: 12px;
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-a {
            display: block;
        }
        .faq-item.open .faq-q i {
            transform: rotate(180deg);
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--bg-dark);
            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: 0.1;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 38px;
            font-weight: 900;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .cta-section p {
            font-size: 18px;
            color: var(--text-light);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .cta-section .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--secondary);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 0;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--border-color);
        }
        .site-footer .footer-brand .logo {
            font-size: 22px;
            margin-bottom: 16px;
        }
        .site-footer .footer-brand p {
            font-size: 14px;
            color: var(--text-dim);
            line-height: 1.8;
            max-width: 320px;
        }
        .site-footer .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }
        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }
        .site-footer .footer-col ul li a {
            font-size: 14px;
            color: var(--text-dim);
            display: flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }
        .site-footer .footer-col ul li a i {
            font-size: 10px;
            color: var(--text-dim);
            transition: var(--transition);
        }
        .site-footer .footer-col ul li a:hover {
            color: var(--primary);
        }
        .site-footer .footer-col ul li a:hover i {
            color: var(--primary);
            transform: translateX(4px);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 0;
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-bottom span {
            font-size: 14px;
            color: var(--text-dim);
        }
        .footer-bottom a {
            color: var(--text-dim);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(240, 192, 64, 0.06);
            border: 1px solid var(--border-color);
            color: var(--text-dim);
            font-size: 17px;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #0d0d18;
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px var(--primary-glow);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr !important;
                gap: 32px;
            }
            .page-banner h1 {
                font-size: 38px;
            }
        }

        @media (max-width: 768px) {
            .nav-list {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }

            .page-banner {
                padding: 120px 0 60px;
                min-height: 300px;
            }
            .page-banner h1 {
                font-size: 30px;
            }
            .page-banner p {
                font-size: 16px;
            }

            .section {
                padding: 56px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .section-header h2 {
                font-size: 28px;
            }

            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .stat-number {
                font-size: 32px;
            }

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

            .cta-section h2 {
                font-size: 28px;
            }
            .cta-section .cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .footer-grid {
                grid-template-columns: 1fr !important;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-banner h1 {
                font-size: 26px;
            }
            .page-banner p {
                font-size: 15px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-item .stat-number {
                font-size: 28px;
            }
            .card h3 {
                font-size: 18px;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 16px;
            }
            .logo-text {
                font-size: 20px;
            }
            .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 16px;
            }
        }

        /* ===== Animation ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in-up {
            animation: fadeInUp 0.6s ease forwards;
        }
        .fade-in-up-delay-1 {
            animation-delay: 0.1s;
        }
        .fade-in-up-delay-2 {
            animation-delay: 0.2s;
        }
        .fade-in-up-delay-3 {
            animation-delay: 0.3s;
        }
        .fade-in-up-delay-4 {
            animation-delay: 0.4s;
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00f0ff;
            --primary-dark: #00c4d4;
            --primary-glow: rgba(0, 240, 255, 0.35);
            --accent: #ff6b35;
            --accent-glow: rgba(255, 107, 53, 0.3);
            --bg-dark: #0b0e17;
            --bg-card: #111620;
            --bg-card-hover: #171e2e;
            --bg-section: #0d111c;
            --bg-section-alt: #0f1420;
            --text-main: #e8edf5;
            --text-secondary: #8a93a8;
            --text-muted: #5a6378;
            --border-color: rgba(0, 240, 255, 0.12);
            --border-active: rgba(0, 240, 255, 0.4);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.08);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --container-width: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::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);
            background: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            list-style: none;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }

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

        /* ===== 标题 ===== */
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--primary);
            background: rgba(0, 240, 255, 0.08);
            padding: 4px 16px;
            border-radius: 100px;
            border: 1px solid rgba(0, 240, 255, 0.15);
            margin-bottom: 12px;
        }
        .section-label i {
            font-size: 0.7rem;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .section-title .highlight {
            color: var(--primary);
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.7;
        }
        .section-desc.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section-title.center {
            text-align: center;
        }
        .section-label.center {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(11, 14, 23, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.07);
            transition: background var(--transition), border-color var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-main);
            font-weight: 800;
            font-size: 1.3rem;
            letter-spacing: -0.02em;
        }
        .logo:hover {
            color: var(--text-main);
        }
        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            font-size: 1.1rem;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
        }
        .logo-text {
            background: linear-gradient(135deg, var(--text-main), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 7px;
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a i {
            font-size: 0.85rem;
        }
        .nav-list a:hover {
            color: var(--text-main);
            background: rgba(0, 240, 255, 0.06);
        }
        .nav-list a.active {
            color: var(--primary);
            background: rgba(0, 240, 255, 0.1);
            box-shadow: inset 0 0 0 1px rgba(0, 240, 255, 0.15), 0 0 20px rgba(0, 240, 255, 0.05);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 40%;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            box-shadow: 0 0 12px var(--primary-glow);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-cta .btn-primary {
            padding: 8px 22px;
            font-size: 0.85rem;
            border-radius: 100px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            font-weight: 700;
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.15);
            transition: all var(--transition);
        }
        .nav-cta .btn-primary:hover {
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.3);
            transform: translateY(-1px);
            color: #0b0e17;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-main);
            font-size: 1.5rem;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(0, 240, 255, 0.06);
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.12);
        }
        .btn-primary:hover {
            box-shadow: 0 0 50px rgba(0, 240, 255, 0.25);
            transform: translateY(-2px);
            color: #0b0e17;
        }
        .btn-outline {
            border: 1px solid rgba(0, 240, 255, 0.25);
            color: var(--primary);
            background: transparent;
        }
        .btn-outline:hover {
            background: rgba(0, 240, 255, 0.06);
            border-color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-accent {
            background: linear-gradient(135deg, var(--accent), #e55a2b);
            color: #fff;
            box-shadow: 0 0 30px rgba(255, 107, 53, 0.15);
        }
        .btn-accent:hover {
            box-shadow: 0 0 50px rgba(255, 107, 53, 0.3);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
        }

        /* ===== Banner ===== */
        .page-banner {
            padding-top: calc(var(--header-height) + 20px);
            padding-bottom: 60px;
            position: relative;
            min-height: 360px;
            display: flex;
            align-items: center;
            background: var(--bg-section);
            overflow: hidden;
        }
        .page-banner .bg-overlay {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.2;
            z-index: 0;
        }
        .page-banner .bg-gradient {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 14, 23, 0.92) 0%, rgba(11, 14, 23, 0.6) 50%, rgba(0, 240, 255, 0.05) 100%);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 16px;
        }
        .page-banner .breadcrumb a {
            color: var(--text-secondary);
        }
        .page-banner .breadcrumb a:hover {
            color: var(--primary);
        }
        .page-banner .breadcrumb i {
            font-size: 0.6rem;
            color: var(--text-muted);
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .page-banner h1 .highlight {
            color: var(--primary);
        }
        .page-banner p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.7;
        }

        /* ===== 板块间距 ===== */
        .section-block {
            padding: 80px 0;
        }
        .section-block.alt {
            background: var(--bg-section-alt);
        }

        /* ===== 卡片网格 ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        /* ===== 卡片通用 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 28px 24px;
            transition: all var(--transition);
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-active);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }
        .card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            background: rgba(0, 240, 255, 0.08);
            color: var(--primary);
            margin-bottom: 16px;
            border: 1px solid rgba(0, 240, 255, 0.1);
        }
        .card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .card .badge {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            background: rgba(0, 240, 255, 0.1);
            color: var(--primary);
            border: 1px solid rgba(0, 240, 255, 0.12);
            margin-bottom: 12px;
        }
        .card .badge.accent {
            background: rgba(255, 107, 53, 0.1);
            color: var(--accent);
            border-color: rgba(255, 107, 53, 0.15);
        }

        /* ===== 步骤 / 时间线 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 32px 24px 28px;
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-active);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 800;
            margin: 0 auto 16px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.15);
        }
        .step-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== 图文板块 ===== */
        .split-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .split-block .visual {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }
        .split-block .visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 320px;
        }
        .split-block .content h2 {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .split-block .content h2 .highlight {
            color: var(--primary);
        }
        .split-block .content p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .split-block .content .features-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .split-block .content .features-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-secondary);
        }
        .split-block .content .features-list li i {
            color: var(--primary);
            font-size: 0.85rem;
            margin-top: 4px;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-active);
        }
        .faq-item summary {
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 12px;
            list-style: none;
            transition: color var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary i.fa-chevron-down {
            margin-left: auto;
            transition: transform var(--transition);
            font-size: 0.75rem;
            color: var(--text-muted);
        }
        .faq-item[open] summary i.fa-chevron-down {
            transform: rotate(180deg);
        }
        .faq-item summary .faq-icon {
            color: var(--primary);
            font-size: 0.9rem;
            width: 20px;
            text-align: center;
        }
        .faq-item .faq-answer {
            padding: 0 24px 18px 56px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.04), rgba(0, 240, 255, 0.01));
            border: 1px solid rgba(0, 240, 255, 0.08);
            border-radius: var(--radius-xl);
            padding: 60px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.04), transparent 70%);
            pointer-events: none;
        }
        .cta-block h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .cta-block p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 540px;
            margin: 0 auto 28px;
        }
        .cta-block .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== 比较/对比表 ===== */
        .compare-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .compare-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition);
        }
        .compare-card.featured {
            border-color: var(--primary);
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.06);
            position: relative;
        }
        .compare-card.featured::before {
            content: '推荐';
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            padding: 2px 18px;
            border-radius: 100px;
            font-size: 0.7rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
        }
        .compare-card .price {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            margin: 12px 0;
        }
        .compare-card .price span {
            font-size: 1rem;
            font-weight: 400;
            color: var(--text-muted);
        }
        .compare-card ul {
            text-align: left;
            margin: 20px 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .compare-card ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .compare-card ul li i {
            color: var(--primary);
            font-size: 0.8rem;
            margin-top: 4px;
        }
        .compare-card ul li i.fa-times {
            color: var(--text-muted);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #080b13;
            border-top: 1px solid rgba(0, 240, 255, 0.06);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }
        .footer-brand .logo {
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 0.85rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }
        .footer-col ul li a i {
            font-size: 0.6rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--primary);
        }
        .footer-col ul li a:hover i {
            color: var(--primary);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0 24px;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom span {
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .footer-bottom span a {
            color: var(--text-muted);
        }
        .footer-bottom span a:hover {
            color: var(--primary);
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-muted);
            font-size: 1rem;
            transition: all var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.04);
        }
        .footer-social a:hover {
            background: rgba(0, 240, 255, 0.1);
            color: var(--primary);
            border-color: rgba(0, 240, 255, 0.15);
            transform: translateY(-2px);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .compare-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .container {
                padding: 0 16px;
            }
            .nav-list {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(11, 14, 23, 0.98);
                backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 16px 20px;
                gap: 4px;
                border-bottom: 1px solid rgba(0, 240, 255, 0.07);
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list a {
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .nav-cta .btn-primary {
                display: none;
            }

            .page-banner h1 {
                font-size: 2rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }

            .section-title {
                font-size: 1.7rem;
            }

            .grid-3,
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .split-block {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .split-block .visual img {
                min-height: 220px;
            }
            .compare-grid {
                grid-template-columns: 1fr;
            }

            .cta-block {
                padding: 40px 24px;
            }
            .cta-block h2 {
                font-size: 1.5rem;
            }
            .cta-block .btn-group {
                flex-direction: column;
                align-items: center;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .faq-item summary {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-item .faq-answer {
                padding: 0 16px 14px 44px;
                font-size: 0.88rem;
            }
        }

        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .card {
                padding: 20px 16px;
            }
            .step-card {
                padding: 24px 16px 20px;
            }
            .compare-card {
                padding: 24px 16px;
            }
            .compare-card .price {
                font-size: 1.8rem;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
        }