/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --clr-primary: #00d4ff;
            --clr-primary-dark: #00a8cc;
            --clr-accent: #7c3aed;
            --clr-accent-light: #a78bfa;
            --clr-bg: #0a0e1a;
            --clr-bg-alt: #111827;
            --clr-bg-card: #1a1f2e;
            --clr-bg-card-hover: #232a3c;
            --clr-surface: #0f172a;
            --clr-text: #f1f5f9;
            --clr-text-muted: #94a3b8;
            --clr-text-dim: #64748b;
            --clr-border: #1e293b;
            --clr-border-light: #334155;
            --clr-success: #10b981;
            --clr-warning: #f59e0b;
            --clr-danger: #ef4444;
            --radius-sm: 8px;
            --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 0 20px rgba(0, 212, 255, 0.15);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-height: 70px;
        }

        /* ===== 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);
            color: var(--clr-text);
            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-primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--clr-primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--clr-primary);
            outline-offset: 2px;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--clr-text);
        }
        p {
            margin-bottom: 0;
        }

        /* ===== Container ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container-custom {
                padding: 0 16px;
            }
        }

        /* ===== Section spacing ===== */
        section {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            section {
                padding: 48px 0;
            }
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 12px;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-subtitle {
            color: var(--clr-text-muted);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 48px;
            text-align: center;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.6rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
        }

        /* ===== Header & Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            height: var(--nav-height);
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(30, 41, 59, 0.6);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10, 14, 26, 0.96);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
        }
        .navbar-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            padding: 0 24px;
            max-width: 1200px;
            margin: 0 auto;
            gap: 16px;
        }
        .nav-logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--clr-text);
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-logo i {
            color: var(--clr-primary);
            font-size: 1.6rem;
        }
        .nav-logo span {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-logo:hover {
            color: var(--clr-text);
        }

        /* Search (nav center) */
        .nav-search-wrap {
            flex: 1;
            max-width: 480px;
            position: relative;
            margin: 0 16px;
        }
        .nav-search-wrap .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--clr-text-dim);
            font-size: 0.9rem;
            pointer-events: none;
        }
        .nav-search-wrap input {
            width: 100%;
            height: 42px;
            padding: 0 16px 0 40px;
            border-radius: 100px;
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            color: var(--clr-text);
            font-size: 0.9rem;
            transition: border var(--transition), box-shadow var(--transition);
        }
        .nav-search-wrap input::placeholder {
            color: var(--clr-text-dim);
        }
        .nav-search-wrap input:focus {
            border-color: var(--clr-primary);
            box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
        }

        /* Nav links */
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--clr-text-muted);
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--clr-text);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-links a.active {
            color: var(--clr-primary);
            background: rgba(0, 212, 255, 0.1);
        }
        .nav-links a.cta-nav {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
            padding: 8px 22px;
            font-weight: 600;
            box-shadow: var(--shadow-glow);
        }
        .nav-links a.cta-nav:hover {
            transform: scale(1.04);
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.25);
        }

        /* Hamburger */
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--clr-text);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        /* Mobile nav panel */
        .nav-mobile-panel {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: rgba(10, 14, 26, 0.98);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--clr-border);
            padding: 20px 24px;
            flex-direction: column;
            gap: 12px;
            z-index: 1040;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
        }
        .nav-mobile-panel.open {
            max-height: 400px;
            padding: 20px 24px;
        }
        .nav-mobile-panel a {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--clr-text-muted);
            font-weight: 500;
            font-size: 1rem;
            transition: background var(--transition), color var(--transition);
        }
        .nav-mobile-panel a:hover {
            color: var(--clr-text);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-mobile-panel a.active {
            color: var(--clr-primary);
            background: rgba(0, 212, 255, 0.08);
        }
        .nav-mobile-panel a.cta-nav {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
            text-align: center;
        }

        @media (max-width: 820px) {
            .nav-links {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .nav-search-wrap {
                max-width: 300px;
                margin: 0 8px;
            }
            .nav-mobile-panel {
                display: flex;
            }
        }
        @media (max-width: 520px) {
            .nav-search-wrap input {
                height: 36px;
                font-size: 0.8rem;
                padding-left: 34px;
            }
            .nav-search-wrap .search-icon {
                left: 10px;
                font-size: 0.8rem;
            }
            .nav-logo {
                font-size: 1.05rem;
            }
            .nav-logo i {
                font-size: 1.2rem;
            }
            .navbar-custom {
                padding: 0 12px;
                gap: 8px;
            }
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            padding: calc(var(--nav-height) + 40px) 0 80px;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            isolation: isolate;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(160deg, rgba(10, 14, 26, 0.88) 40%, rgba(10, 14, 26, 0.6) 80%, rgba(10, 14, 26, 0.3));
            z-index: 0;
        }
        .hero .container-custom {
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 100px;
            background: rgba(0, 212, 255, 0.12);
            border: 1px solid rgba(0, 212, 255, 0.2);
            color: var(--clr-primary);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            font-size: 0.75rem;
        }
        .hero h1 {
            font-size: 3.6rem;
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 20px;
            max-width: 800px;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            color: var(--clr-text-muted);
            max-width: 600px;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 100px;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
            font-weight: 700;
            font-size: 1.05rem;
            border: none;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 20px rgba(0, 212, 255, 0.25);
        }
        .btn-primary-custom:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 8px 36px rgba(0, 212, 255, 0.35);
            color: #fff;
        }
        .btn-secondary-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 100px;
            background: transparent;
            color: var(--clr-text);
            font-weight: 600;
            font-size: 1.05rem;
            border: 1px solid var(--clr-border-light);
            cursor: pointer;
            transition: background var(--transition), border-color var(--transition), color var(--transition);
        }
        .btn-secondary-custom:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: var(--clr-primary);
            color: var(--clr-primary);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 32px 48px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .hero-stat h3 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--clr-primary);
            margin-bottom: 2px;
        }
        .hero-stat p {
            font-size: 0.9rem;
            color: var(--clr-text-dim);
            margin-bottom: 0;
        }

        @media (max-width: 820px) {
            .hero h1 {
                font-size: 2.4rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 20px 32px;
            }
            .hero-stat h3 {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 520px) {
            .hero {
                min-height: 0;
                padding: calc(var(--nav-height) + 24px) 0 48px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn-primary-custom,
            .hero-actions .btn-secondary-custom {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }
        }

        /* ===== Cards ===== */
        .card-custom {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
            height: 100%;
        }
        .card-custom:hover {
            background: var(--clr-bg-card-hover);
            border-color: var(--clr-border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .card-custom .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 18px;
            background: rgba(0, 212, 255, 0.1);
            color: var(--clr-primary);
        }
        .card-custom h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .card-custom p {
            color: var(--clr-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card-custom .card-tag {
            display: inline-block;
            padding: 2px 14px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(124, 58, 237, 0.15);
            color: var(--clr-accent-light);
            margin-bottom: 12px;
        }

        /* ===== Cover card ===== */
        .cover-card {
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            height: 100%;
        }
        .cover-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--clr-border-light);
        }
        .cover-card .cover-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .cover-card .cover-body {
            padding: 20px 20px 24px;
        }
        .cover-card .cover-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .cover-card .cover-body p {
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .cover-card .cover-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--clr-text-dim);
        }
        .cover-card .cover-meta i {
            margin-right: 4px;
        }

        /* ===== Feature / Icon grid ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        /* ===== Steps ===== */
        .step-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: center;
            counter-reset: step;
        }
        .step-item {
            flex: 1 1 200px;
            max-width: 260px;
            text-align: center;
            position: relative;
            counter-increment: step;
        }
        .step-item::before {
            content: counter(step);
            display: block;
            width: 48px;
            height: 48px;
            line-height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            margin: 0 auto 16px;
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.2);
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .step-item:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 24px;
            right: -20px;
            width: 24px;
            height: 2px;
            background: linear-gradient(90deg, var(--clr-primary), transparent);
        }
        @media (max-width: 820px) {
            .step-item:not(:last-child)::after {
                display: none;
            }
            .step-wrap {
                gap: 24px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--clr-border-light);
        }
        .faq-item .faq-q {
            padding: 18px 20px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--clr-text);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            transition: background var(--transition);
            user-select: none;
        }
        .faq-item .faq-q:hover {
            background: rgba(255, 255, 255, 0.03);
        }
        .faq-item .faq-q i {
            color: var(--clr-primary);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-q i {
            transform: rotate(180deg);
        }
        .faq-item .faq-a {
            padding: 0 20px 18px;
            color: var(--clr-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-a {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(124, 58, 237, 0.05));
            border-top: 1px solid var(--clr-border);
            border-bottom: 1px solid var(--clr-border);
        }
        .cta-box {
            text-align: center;
            padding: 48px 24px;
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-lg);
            max-width: 800px;
            margin: 0 auto;
            box-shadow: var(--shadow-sm);
        }
        .cta-box h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .cta-box p {
            color: var(--clr-text-muted);
            font-size: 1.05rem;
            margin-bottom: 28px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .nav-logo {
            font-size: 1.2rem;
            margin-bottom: 12px;
        }
        .footer-brand p {
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--clr-text);
        }
        .footer-col a {
            display: block;
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--clr-primary);
        }
        .footer-bottom {
            border-top: 1px solid var(--clr-border);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--clr-text-dim);
        }
        .footer-bottom a {
            color: var(--clr-text-dim);
        }
        .footer-bottom a:hover {
            color: var(--clr-primary);
        }
        @media (max-width: 820px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== News / post list ===== */
        .news-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }
        .news-item {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-sm);
            padding: 20px 22px;
            transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
        }
        .news-item:hover {
            background: var(--clr-bg-card-hover);
            border-color: var(--clr-border-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .news-item .news-cat {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(0, 212, 255, 0.1);
            color: var(--clr-primary);
            margin-bottom: 10px;
        }
        .news-item h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .news-item h3 a {
            color: var(--clr-text);
            transition: color var(--transition);
        }
        .news-item h3 a:hover {
            color: var(--clr-primary);
        }
        .news-item p {
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .news-item .news-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--clr-text-dim);
        }
        .news-item .news-meta i {
            margin-right: 4px;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--clr-text-dim);
            font-size: 1rem;
            background: var(--clr-bg-card);
            border-radius: var(--radius-sm);
            border: 1px dashed var(--clr-border);
        }

        /* ===== Category page banner ===== */
        .cat-banner {
            padding: calc(var(--nav-height) + 48px) 0 48px;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            position: relative;
            isolation: isolate;
        }
        .cat-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 14, 26, 0.9), rgba(10, 14, 26, 0.6));
            z-index: 0;
        }
        .cat-banner .container-custom {
            position: relative;
            z-index: 1;
        }
        .cat-banner h1 {
            font-size: 2.4rem;
            font-weight: 800;
        }
        .cat-banner p {
            color: var(--clr-text-muted);
            font-size: 1.05rem;
            max-width: 500px;
            margin-top: 8px;
        }

        /* ===== Utility ===== */
        .text-gradient {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .glow-border {
            border-color: rgba(0, 212, 255, 0.2);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.05);
        }
        .gap-section {
            gap: 24px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-custom {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 16px;
            font-size: 0.85rem;
            color: var(--clr-text-dim);
            margin-bottom: 16px;
        }
        .breadcrumb-custom a {
            color: var(--clr-text-dim);
        }
        .breadcrumb-custom a:hover {
            color: var(--clr-primary);
        }
        .breadcrumb-custom span {
            color: var(--clr-text-muted);
        }

        /* ===== Smooth reveal (optional) ===== */
        .reveal {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

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

        /* ===== Responsive tweaks ===== */
        @media (max-width: 420px) {
            .hero h1 {
                font-size: 1.5rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .card-custom {
                padding: 20px 16px;
            }
            .cta-box {
                padding: 32px 16px;
            }
            .cta-box h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: article */
:root {
            --clr-primary: #00d4ff;
            --clr-primary-dark: #0099cc;
            --clr-accent: #7c3aed;
            --clr-accent-light: #a78bfa;
            --clr-bg: #0b0f1a;
            --clr-bg-secondary: #111827;
            --clr-bg-card: #1a2332;
            --clr-bg-card-hover: #1f2b3f;
            --clr-text: #e2e8f0;
            --clr-text-secondary: #cbd5e1;
            --clr-text-muted: #94a3b8;
            --clr-border: rgba(255,255,255,0.08);
            --clr-border-hover: rgba(0,212,255,0.25);
            --clr-overlay: rgba(0,0,0,0.6);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
            --shadow-md: 0 8px 32px rgba(0,0,0,0.3);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.4);
            --shadow-glow: 0 0 20px rgba(0,212,255,0.15);
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
            --font-sans: 'Inter','Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
        }
        *,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-sans);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--clr-primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--clr-accent-light); }
        img { max-width: 100%; height: auto; display: block; }
        .container-custom { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        @media (max-width:768px) { .container-custom { padding: 0 16px; } }

        /* Navigation */
        .navbar-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 32px;
            background: rgba(11,15,26,0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--clr-border);
            position: sticky;
            top: 0;
            z-index: 1050;
            gap: 16px;
            flex-wrap: wrap;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--clr-text);
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-logo i { color: var(--clr-primary); font-size: 1.5rem; }
        .nav-logo:hover { color: var(--clr-primary); }
        .nav-search-wrap {
            flex: 1;
            max-width: 420px;
            position: relative;
            display: none;
        }
        .nav-search-wrap .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            pointer-events: none;
        }
        .nav-search-wrap input {
            width: 100%;
            padding: 10px 16px 10px 42px;
            border-radius: 50px;
            border: 1px solid var(--clr-border);
            background: var(--clr-bg-card);
            color: var(--clr-text);
            font-size: 0.9rem;
            transition: all var(--transition);
            outline: none;
        }
        .nav-search-wrap input::placeholder { color: var(--clr-text-muted); }
        .nav-search-wrap input:focus { border-color: var(--clr-primary); box-shadow: var(--shadow-glow); }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .nav-links a {
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--clr-text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links a:hover { color: var(--clr-primary); background: rgba(0,212,255,0.08); }
        .nav-links a.active { color: var(--clr-primary); background: rgba(0,212,255,0.12); }
        .nav-links a.cta-nav {
            background: linear-gradient(135deg,var(--clr-primary),var(--clr-accent));
            color: #fff;
            font-weight: 600;
            padding: 8px 22px;
            box-shadow: 0 4px 16px rgba(0,212,255,0.25);
        }
        .nav-links a.cta-nav:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0,212,255,0.35); }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--clr-text);
            font-size: 1.4rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
        }
        .nav-toggle:focus { outline: 2px solid var(--clr-primary); }
        @media (min-width:992px) { .nav-search-wrap { display: block; } }
        @media (max-width:991px) {
            .navbar-custom { padding: 12px 16px; }
            .nav-links {
                width: 100%;
                justify-content: center;
                padding-top: 12px;
                border-top: 1px solid var(--clr-border);
                display: none;
            }
            .nav-links.open { display: flex; }
            .nav-toggle { display: block; }
        }
        @media (max-width:520px) {
            .nav-links { gap: 4px; }
            .nav-links a { padding: 6px 12px; font-size: 0.82rem; }
        }

        /* Article Hero */
        .article-hero {
            position: relative;
            padding: 60px 0 40px;
            background: var(--clr-bg-secondary);
            border-bottom: 1px solid var(--clr-border);
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.06;
            pointer-events: none;
        }
        .article-hero .container-custom { position: relative; z-index: 1; }
        .breadcrumb-custom {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--clr-text-muted);
            margin-bottom: 20px;
        }
        .breadcrumb-custom a { color: var(--clr-text-muted); }
        .breadcrumb-custom a:hover { color: var(--clr-primary); }
        .breadcrumb-custom .sep { color: var(--clr-border); }
        .article-hero h1 {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
            background: linear-gradient(135deg,var(--clr-text),var(--clr-primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .article-meta-row {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            font-size: 0.9rem;
            color: var(--clr-text-muted);
        }
        .article-meta-row .badge-custom {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(124,58,237,0.15);
            color: var(--clr-accent-light);
            font-size: 0.8rem;
            font-weight: 600;
        }
        .article-meta-row i { margin-right: 6px; color: var(--clr-primary); }
        @media (max-width:768px) {
            .article-hero { padding: 40px 0 28px; }
            .article-hero h1 { font-size: 1.6rem; }
        }

        /* Article Cover */
        .article-cover-wrap {
            margin: -20px 0 0;
            position: relative;
            z-index: 2;
        }
        .article-cover-wrap img {
            width: 100%;
            max-height: 480px;
            object-fit: cover;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
        }
        @media (max-width:768px) {
            .article-cover-wrap img { max-height: 260px; border-radius: var(--radius-md); }
        }

        /* Article Content */
        .article-content-wrap {
            padding: 48px 0 40px;
        }
        .content-body {
            max-width: 800px;
            margin: 0 auto;
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--clr-text-secondary);
        }
        .content-body p { margin-bottom: 1.5em; }
        .content-body h2, .content-body h3, .content-body h4 {
            color: var(--clr-text);
            font-weight: 700;
            margin-top: 1.8em;
            margin-bottom: 0.8em;
        }
        .content-body h2 { font-size: 1.6rem; }
        .content-body h3 { font-size: 1.3rem; }
        .content-body h4 { font-size: 1.1rem; }
        .content-body ul, .content-body ol { margin-bottom: 1.5em; padding-left: 1.5em; }
        .content-body li { margin-bottom: 0.5em; }
        .content-body blockquote {
            border-left: 4px solid var(--clr-primary);
            padding: 16px 24px;
            margin: 1.5em 0;
            background: rgba(0,212,255,0.05);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--clr-text-muted);
            font-style: italic;
        }
        .content-body code {
            background: var(--clr-bg-card);
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--clr-primary);
        }
        .content-body pre {
            background: var(--clr-bg-card);
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            border: 1px solid var(--clr-border);
            margin: 1.5em 0;
        }
        .content-body pre code { background: none; padding: 0; }
        .content-body a { color: var(--clr-primary); text-decoration: underline; }
        .content-body img { border-radius: var(--radius-md); margin: 1.5em 0; }
        .content-body table { width: 100%; border-collapse: collapse; margin: 1.5em 0; }
        .content-body th, .content-body td {
            padding: 12px 16px;
            border: 1px solid var(--clr-border);
            text-align: left;
        }
        .content-body th { background: var(--clr-bg-card); font-weight: 600; color: var(--clr-text); }
        .content-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .content-not-found i { font-size: 3rem; color: var(--clr-text-muted); margin-bottom: 20px; display: block; }
        .content-not-found h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .content-not-found p { color: var(--clr-text-muted); margin-bottom: 24px; }
        .content-not-found .btn-back { display: inline-block; padding: 12px 32px; border-radius: 50px; background: var(--clr-primary); color: #fff; font-weight: 600; transition: all var(--transition); }
        .content-not-found .btn-back:hover { background: var(--clr-primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-glow); }
        @media (max-width:768px) {
            .content-body { font-size: 0.98rem; }
            .content-body h2 { font-size: 1.35rem; }
        }

        /* Article Tags & Share */
        .article-tags-share {
            padding: 24px 0 32px;
            border-top: 1px solid var(--clr-border);
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .article-tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .article-tags .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            background: var(--clr-bg-card);
            color: var(--clr-text-muted);
            font-size: 0.82rem;
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .article-tags .tag:hover { border-color: var(--clr-primary); color: var(--clr-primary); }
        .article-share { display: flex; gap: 10px; align-items: center; }
        .article-share span { font-size: 0.85rem; color: var(--clr-text-muted); }
        .article-share a {
            width: 36px; height: 36px;
            border-radius: 50%;
            background: var(--clr-bg-card);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--clr-text-muted);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .article-share a:hover { background: var(--clr-primary); color: #fff; border-color: var(--clr-primary); transform: translateY(-2px); }

        /* Article Pagination */
        .article-pagination {
            padding: 32px 0;
            max-width: 800px;
            margin: 0 auto;
        }
        .article-pagination .row { gap: 12px; }
        .article-pagination .col { flex: 1; min-width: 0; }
        .pag-link {
            display: flex;
            flex-direction: column;
            padding: 16px 20px;
            border-radius: var(--radius-md);
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            color: var(--clr-text);
            text-decoration: none;
        }
        .pag-link:hover { border-color: var(--clr-primary); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
        .pag-link .label { font-size: 0.78rem; color: var(--clr-text-muted); margin-bottom: 4px; }
        .pag-link .title { font-size: 0.95rem; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
        .pag-link .arrow { color: var(--clr-primary); }
        .pag-link.disabled { opacity: 0.4; pointer-events: none; }
        @media (max-width:600px) {
            .article-pagination .row { flex-direction: column; }
        }

        /* Related Articles */
        .related-section {
            padding: 56px 0 48px;
            background: var(--clr-bg-secondary);
            border-top: 1px solid var(--clr-border);
        }
        .related-section h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 32px;
            position: relative;
            display: inline-block;
        }
        .related-section h2::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg,var(--clr-primary),var(--clr-accent));
            border-radius: 4px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3,1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            text-decoration: none;
            color: var(--clr-text);
        }
        .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--clr-border-hover); }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-bottom: 1px solid var(--clr-border);
        }
        .related-card .card-body { padding: 18px 20px 22px; }
        .related-card .card-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
        .related-card .card-body p { font-size: 0.88rem; color: var(--clr-text-muted); margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .related-card .card-meta { font-size: 0.78rem; color: var(--clr-text-muted); display: flex; gap: 12px; }
        .related-card .card-meta i { margin-right: 4px; color: var(--clr-primary); }
        @media (max-width:992px) { .related-grid { grid-template-columns: repeat(2,1fr); } }
        @media (max-width:600px) { .related-grid { grid-template-columns: 1fr; } }

        /* CTA Section */
        .cta-section {
            padding: 72px 0;
            text-align: center;
            position: relative;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(11,15,26,0.82);
            pointer-events: none;
        }
        .cta-section .container-custom { position: relative; z-index: 1; }
        .cta-section h2 { font-size: 2rem; font-weight: 700; margin-bottom: 16px; }
        .cta-section p { font-size: 1.05rem; color: var(--clr-text-muted); max-width: 600px; margin: 0 auto 32px; }
        .cta-section .btn-cta {
            display: inline-block;
            padding: 16px 48px;
            border-radius: 50px;
            background: linear-gradient(135deg,var(--clr-primary),var(--clr-accent));
            color: #fff;
            font-weight: 700;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: 0 8px 32px rgba(0,212,255,0.3);
            text-decoration: none;
        }
        .cta-section .btn-cta:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,212,255,0.45); }
        @media (max-width:768px) {
            .cta-section { padding: 48px 0; }
            .cta-section h2 { font-size: 1.5rem; }
            .cta-section .btn-cta { padding: 14px 36px; font-size: 0.95rem; }
        }

        /* Footer */
        .site-footer {
            background: var(--clr-bg-secondary);
            border-top: 1px solid var(--clr-border);
            padding: 56px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .nav-logo { margin-bottom: 12px; }
        .footer-brand p { color: var(--clr-text-muted); font-size: 0.9rem; line-height: 1.7; }
        .footer-col h4 { font-size: 1rem; font-weight: 600; margin-bottom: 16px; color: var(--clr-text); }
        .footer-col a {
            display: block;
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: all var(--transition);
            text-decoration: none;
        }
        .footer-col a:hover { color: var(--clr-primary); padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid var(--clr-border);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--clr-text-muted);
        }
        @media (max-width:992px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
        @media (max-width:600px) { .footer-grid { grid-template-columns: 1fr; gap: 24px; } }
        @media (max-width:520px) { .footer-bottom { flex-direction: column; text-align: center; } }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --clr-primary: #00d4ff;
            --clr-primary-dark: #009bbf;
            --clr-primary-light: #66e5ff;
            --clr-accent: #a855f7;
            --clr-accent-dark: #7c3aed;
            --clr-accent-light: #c084fc;
            --clr-bg: #0b0f1a;
            --clr-bg-alt: #111827;
            --clr-bg-card: #1a1f2e;
            --clr-bg-card-hover: #242a3d;
            --clr-surface: #1e2438;
            --clr-text: #e8edf5;
            --clr-text-alt: #c8d0e0;
            --clr-text-muted: #8891a8;
            --clr-border: rgba(0, 212, 255, 0.15);
            --clr-border-hover: rgba(0, 212, 255, 0.4);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
            --shadow-card-hover: 0 8px 40px rgba(0, 212, 255, 0.1);
            --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
            --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --spacer-section: 5rem;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-sans);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--clr-primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            outline: none;
            border: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--clr-text);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2.2rem;
            margin-bottom: 1.2rem;
        }
        h3 {
            font-size: 1.5rem;
        }
        p {
            color: var(--clr-text-alt);
            margin-bottom: 0.8rem;
        }
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Navbar ===== */
        .navbar-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 68px;
            background: rgba(11, 15, 26, 0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--clr-border);
            position: sticky;
            top: 0;
            z-index: 1050;
            transition: background var(--transition), border-color var(--transition);
        }
        .navbar-custom .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--clr-text);
            flex-shrink: 0;
        }
        .navbar-custom .nav-logo i {
            font-size: 1.6rem;
            color: var(--clr-primary);
        }
        .navbar-custom .nav-logo span {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-search-wrap {
            flex: 1;
            max-width: 400px;
            margin: 0 20px;
            position: relative;
        }
        .nav-search-wrap .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            pointer-events: none;
        }
        .nav-search-wrap input {
            width: 100%;
            padding: 9px 16px 9px 40px;
            border-radius: 50px;
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            color: var(--clr-text);
            font-size: 0.9rem;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .nav-search-wrap input::placeholder {
            color: var(--clr-text-muted);
        }
        .nav-search-wrap input:focus {
            border-color: var(--clr-primary);
            box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }
        .nav-links a {
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--clr-text-alt);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--clr-text);
            background: var(--clr-bg-card);
        }
        .nav-links a.active {
            color: var(--clr-primary);
            background: rgba(0, 212, 255, 0.1);
            box-shadow: inset 0 0 0 1px rgba(0, 212, 255, 0.2);
        }
        .nav-links a.cta-nav {
            background: linear-gradient(135deg, var(--clr-primary-dark), var(--clr-accent-dark));
            color: #fff;
            font-weight: 600;
            padding: 8px 22px;
            box-shadow: 0 2px 12px rgba(0, 155, 191, 0.3);
        }
        .nav-links a.cta-nav:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 20px rgba(0, 155, 191, 0.45);
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: transparent;
            color: var(--clr-text);
            font-size: 1.5rem;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--clr-bg-card);
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            position: relative;
            padding: 6rem 0 5rem;
            min-height: 380px;
            display: flex;
            align-items: center;
            background: var(--clr-bg-alt);
            overflow: hidden;
        }
        .category-hero .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
        }
        .category-hero .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(0, 212, 255, 0.08), transparent 70%),
                radial-gradient(ellipse at 80% 60%, rgba(168, 85, 247, 0.06), transparent 60%);
            z-index: 1;
        }
        .category-hero .container-custom {
            position: relative;
            z-index: 2;
        }
        .category-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 50px;
            background: rgba(0, 212, 255, 0.1);
            border: 1px solid rgba(0, 212, 255, 0.2);
            font-size: 0.85rem;
            color: var(--clr-primary);
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .category-hero .hero-badge i {
            font-size: 0.75rem;
        }
        .category-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            background: linear-gradient(135deg, #fff 30%, var(--clr-primary-light) 70%, var(--clr-accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            max-width: 720px;
            line-height: 1.2;
            margin-bottom: 16px;
        }
        .category-hero .hero-desc {
            font-size: 1.15rem;
            color: var(--clr-text-alt);
            max-width: 620px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .category-hero .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 50px;
            background: linear-gradient(135deg, var(--clr-primary-dark), var(--clr-accent-dark));
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: 0 2px 16px rgba(0, 155, 191, 0.3);
        }
        .btn-primary-custom:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 30px rgba(0, 155, 191, 0.45);
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
        }
        .btn-outline-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 50px;
            background: transparent;
            color: var(--clr-text-alt);
            font-weight: 600;
            font-size: 0.95rem;
            border: 1px solid var(--clr-border);
            cursor: pointer;
            transition: all var(--transition);
        }
        .btn-outline-custom:hover {
            border-color: var(--clr-primary);
            color: var(--clr-primary);
            background: rgba(0, 212, 255, 0.05);
            transform: translateY(-2px);
        }

        /* ===== Section Shared ===== */
        .section-padding {
            padding: var(--spacer-section) 0;
        }
        .section-title-wrap {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-title-wrap .section-label {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 50px;
            background: rgba(0, 212, 255, 0.08);
            border: 1px solid rgba(0, 212, 255, 0.15);
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--clr-primary);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 12px;
        }
        .section-title-wrap h2 {
            font-size: 2.4rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .section-title-wrap p {
            max-width: 600px;
            margin: 0 auto;
            color: var(--clr-text-muted);
            font-size: 1.05rem;
        }
        .section-title-wrap.text-start {
            text-align: left;
        }
        .section-title-wrap.text-start p {
            margin: 0;
        }

        /* ===== Protocol Cards ===== */
        .protocol-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .protocol-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 24px 28px;
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .protocol-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .protocol-card:hover {
            transform: translateY(-6px);
            border-color: var(--clr-border-hover);
            box-shadow: var(--shadow-card-hover);
            background: var(--clr-bg-card-hover);
        }
        .protocol-card:hover::before {
            opacity: 1;
        }
        .protocol-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: rgba(0, 212, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--clr-primary);
            margin-bottom: 18px;
            transition: all var(--transition);
        }
        .protocol-card:hover .card-icon {
            background: rgba(0, 212, 255, 0.18);
            transform: scale(1.05);
        }
        .protocol-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .protocol-card p {
            font-size: 0.92rem;
            color: var(--clr-text-muted);
            margin-bottom: 16px;
        }
        .protocol-card .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .protocol-card .tag-list .tag {
            padding: 2px 12px;
            border-radius: 50px;
            background: rgba(168, 85, 247, 0.1);
            border: 1px solid rgba(168, 85, 247, 0.15);
            font-size: 0.75rem;
            color: var(--clr-accent-light);
            font-weight: 500;
        }

        /* ===== Flow Steps ===== */
        .flow-section {
            background: var(--clr-bg-alt);
        }
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        .flow-step {
            background: var(--clr-bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 20px 24px;
            border: 1px solid var(--clr-border);
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }
        .flow-step:hover {
            border-color: var(--clr-border-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }
        .flow-step .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--clr-primary-dark), var(--clr-accent-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin: 0 auto 16px;
            box-shadow: 0 2px 16px rgba(0, 155, 191, 0.3);
        }
        .flow-step h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .flow-step p {
            font-size: 0.88rem;
            color: var(--clr-text-muted);
            margin-bottom: 0;
        }
        .flow-step .step-arrow {
            display: none;
        }

        /* ===== Features ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .feature-item {
            display: flex;
            gap: 18px;
            padding: 24px 20px;
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .feature-item:hover {
            border-color: var(--clr-border-hover);
            background: var(--clr-bg-card-hover);
            transform: translateX(4px);
        }
        .feature-item .fi-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: rgba(0, 212, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--clr-primary);
        }
        .feature-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .feature-item p {
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--clr-bg-alt);
        }
        .faq-grid {
            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);
            padding: 0;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--clr-border-hover);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--clr-text);
            background: transparent;
            transition: background var(--transition);
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question:hover {
            background: rgba(0, 212, 255, 0.03);
        }
        .faq-question i {
            color: var(--clr-primary);
            transition: transform var(--transition);
            font-size: 0.85rem;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--clr-text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.show {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            padding: 5rem 0;
            background: var(--clr-bg-alt);
            overflow: hidden;
        }
        .cta-section .cta-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.1;
            z-index: 0;
        }
        .cta-section .container-custom {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            max-width: 560px;
            margin: 0 auto 28px;
            color: var(--clr-text-muted);
            font-size: 1.05rem;
        }
        .cta-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            padding: 4rem 0 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 3rem;
        }
        .footer-brand .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--clr-text);
            margin-bottom: 12px;
        }
        .footer-brand .nav-logo i {
            font-size: 1.4rem;
            color: var(--clr-primary);
        }
        .footer-brand .nav-logo span {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-brand p {
            color: var(--clr-text-muted);
            font-size: 0.92rem;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--clr-text);
        }
        .footer-col a {
            display: block;
            padding: 4px 0;
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            transition: all var(--transition);
        }
        .footer-col a:hover {
            color: var(--clr-primary);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--clr-border);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--clr-text-muted);
        }
        .footer-bottom a {
            color: var(--clr-text-muted);
        }
        .footer-bottom a:hover {
            color: var(--clr-primary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .protocol-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            .navbar-custom {
                padding: 0 16px;
                height: 60px;
            }
            .nav-search-wrap {
                display: none;
            }
            .nav-links {
                position: fixed;
                top: 60px;
                left: 0;
                width: 100%;
                flex-direction: column;
                background: rgba(11, 15, 26, 0.98);
                backdrop-filter: blur(16px);
                border-bottom: 1px solid var(--clr-border);
                padding: 16px 20px;
                gap: 8px;
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s ease;
                z-index: 1040;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
            }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
            .nav-toggle {
                display: block;
            }
            .category-hero {
                padding: 4rem 0 3rem;
                min-height: auto;
            }
            .category-hero h1 {
                font-size: 2rem;
            }
            .category-hero .hero-desc {
                font-size: 1rem;
            }
            .section-title-wrap h2 {
                font-size: 1.8rem;
            }
            .protocol-grid {
                grid-template-columns: 1fr;
            }
            .flow-grid {
                grid-template-columns: 1fr;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .section-padding {
                --spacer-section: 3.5rem;
            }
        }
        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.7rem;
            }
            .hero-actions .btn-primary-custom,
            .hero-actions .btn-outline-custom {
                width: 100%;
                justify-content: center;
            }
            .cta-actions .btn-primary-custom,
            .cta-actions .btn-outline-custom {
                width: 100%;
                justify-content: center;
            }
            .feature-item {
                flex-direction: column;
                align-items: flex-start;
            }
        }