/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --neon-cyan: #00f0ff;
            --neon-purple: #a855f7;
            --neon-magenta: #ff00e5;
            --neon-blue: #3b82f6;
            --bg-deep: #08080e;
            --bg-card: #111122;
            --bg-card-hover: #1a1a30;
            --bg-surface: #0d0d1a;
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --border-subtle: rgba(0, 240, 255, 0.12);
            --border-glow: rgba(0, 240, 255, 0.3);
            --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.15);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Base Reset ===== */
        *,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
        }
        img { max-width: 100%; display: block; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input,textarea { font-family: inherit; border: none; outline: none; }
        ul,ol { list-style: none; }
        h1,h2,h3,h4,h5,h6 { line-height: 1.2; font-weight: 700; }

        /* ===== Utility Classes ===== */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        .container--narrow { max-width: 920px; }
        .section-padding { padding: 80px 0; }
        .section-padding--sm { padding: 56px 0; }
        .text-gradient {
            background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .text-gradient-magenta {
            background: linear-gradient(135deg, var(--neon-magenta), var(--neon-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .glow-cyan { box-shadow: 0 0 30px rgba(0, 240, 255, 0.25); }
        .glow-purple { box-shadow: 0 0 30px rgba(168, 85, 247, 0.25); }
        .border-glow { border: 1px solid var(--border-glow); }
        .border-subtle { border: 1px solid var(--border-subtle); }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--bg-deep); }
        ::-webkit-scrollbar-thumb { background: rgba(0, 240, 255, 0.25); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: rgba(0, 240, 255, 0.4); }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(8, 8, 14, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-subtle);
        }
        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 4px;
            transition: var(--transition);
            letter-spacing: 0.3px;
        }
        .nav-link:hover { color: var(--neon-cyan); }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--neon-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.6);
            transition: var(--transition);
            border-radius: 2px;
        }
        .nav-link:hover::after { width: 100%; }
        .nav-link.active {
            color: var(--neon-cyan);
        }
        .nav-link.active::after {
            width: 100%;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.8);
        }
        .nav-cta {
            background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
            color: #0a0a0f !important;
            font-weight: 600;
            padding: 10px 24px;
            border-radius: 100px;
            transition: var(--transition);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
        }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.4);
        }
        .mobile-menu-btn {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 4px;
            cursor: pointer;
        }
        .mobile-menu-btn span {
            display: block;
            width: 28px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }
        .mobile-menu-btn.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .mobile-menu-btn.open span:nth-child(2) { opacity: 0; }
        .mobile-menu-btn.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 88vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            background: var(--bg-deep);
        }
        .hero-bg-grid {
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
            background-size: 60px 60px;
            mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
            -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
        }
        .hero-glow-1 {
            position: absolute;
            top: -20%;
            left: -10%;
            width: 60%;
            height: 60%;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.08), transparent 70%);
            pointer-events: none;
        }
        .hero-glow-2 {
            position: absolute;
            bottom: -20%;
            right: -10%;
            width: 50%;
            height: 50%;
            background: radial-gradient(circle, rgba(168, 85, 247, 0.08), transparent 70%);
            pointer-events: none;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.2);
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 0.85rem;
            color: var(--neon-cyan);
            font-weight: 500;
            letter-spacing: 0.5px;
            margin-bottom: 24px;
        }
        .hero-title {
            font-size: clamp(2.6rem, 7vw, 4.8rem);
            font-weight: 800;
            line-height: 1.08;
            letter-spacing: -0.02em;
        }
        .hero-sub {
            font-size: clamp(1.05rem, 2vw, 1.25rem);
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.7;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 32px; }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
            color: #0a0a0f;
            font-weight: 600;
            padding: 14px 36px;
            border-radius: 100px;
            font-size: 1rem;
            transition: var(--transition);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.2);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 50px rgba(0, 240, 255, 0.35);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: transparent;
            color: var(--text-primary);
            font-weight: 500;
            padding: 14px 36px;
            border-radius: 100px;
            font-size: 1rem;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
        }
        .btn-secondary:hover {
            border-color: var(--neon-cyan);
            color: var(--neon-cyan);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.1);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 56px;
            padding-top: 32px;
            border-top: 1px solid var(--border-subtle);
        }
        .hero-stat-number {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--neon-cyan);
        }
        .hero-stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 2px;
        }

        /* ===== Section Headers ===== */
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--neon-cyan);
            margin-bottom: 8px;
        }
        .section-title {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            font-weight: 700;
            letter-spacing: -0.01em;
        }
        .section-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 600px;
            line-height: 1.7;
        }

        /* ===== Cards ===== */
        .card-neon {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .card-neon::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
            opacity: 0;
            transition: var(--transition);
        }
        .card-neon:hover {
            border-color: rgba(0, 240, 255, 0.2);
            transform: translateY(-6px);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 240, 255, 0.05);
            background: var(--bg-card-hover);
        }
        .card-neon:hover::before { opacity: 1; }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 20px;
            background: rgba(0, 240, 255, 0.08);
            color: var(--neon-cyan);
        }
        .card-icon.purple { background: rgba(168, 85, 247, 0.08); color: var(--neon-purple); }
        .card-icon.magenta { background: rgba(255, 0, 229, 0.08); color: var(--neon-magenta); }
        .card-neon h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 10px; }
        .card-neon p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

        /* ===== Feature Grid ===== */
        .feature-card {
            display: flex;
            gap: 20px;
            padding: 24px;
            border-radius: var(--radius-md);
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
        }
        .feature-card:hover {
            border-color: rgba(0, 240, 255, 0.15);
            background: var(--bg-card-hover);
        }
        .feature-card-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            background: rgba(0, 240, 255, 0.08);
            color: var(--neon-cyan);
        }
        .feature-card h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
        .feature-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

        /* ===== Category Cards ===== */
        .cat-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            padding: 36px 28px 28px;
        }
        .cat-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
            opacity: 0.6;
        }
        .cat-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            border-color: rgba(0, 240, 255, 0.2);
        }
        .cat-card .cat-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 18px;
            background: rgba(0, 240, 255, 0.08);
            color: var(--neon-cyan);
        }
        .cat-card h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 8px; }
        .cat-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }
        .cat-card .cat-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 18px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--neon-cyan);
            transition: var(--transition);
        }
        .cat-card .cat-link:hover { gap: 12px; }

        /* ===== Steps ===== */
        .step-item {
            display: flex;
            gap: 24px;
            position: relative;
            padding-bottom: 40px;
        }
        .step-item:not(:last-child)::before {
            content: '';
            position: absolute;
            left: 20px;
            top: 52px;
            bottom: 0;
            width: 1px;
            background: linear-gradient(to bottom, var(--neon-cyan), transparent);
            opacity: 0.3;
        }
        .step-number {
            flex-shrink: 0;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
            background: rgba(0, 240, 255, 0.1);
            color: var(--neon-cyan);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }
        .step-content h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 4px; }
        .step-content p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

        /* ===== FAQ ===== */
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover { border-color: rgba(0, 240, 255, 0.15); }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-weight: 600;
            font-size: 1rem;
        }
        .faq-question i { color: var(--neon-cyan); transition: var(--transition); }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 16px;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            overflow: hidden;
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-subtle);
            padding: 64px 48px;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 50%;
            height: 200%;
            background: radial-gradient(ellipse, rgba(0, 240, 255, 0.06), transparent 70%);
            pointer-events: none;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-subtle);
            padding: 48px 0 32px;
        }
        .footer-brand { font-size: 1.2rem; font-weight: 700; }
        .footer-desc { font-size: 0.9rem; color: var(--text-muted); max-width: 320px; line-height: 1.7; }
        .footer-heading { font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: var(--text-secondary); margin-bottom: 16px; }
        .footer-link { font-size: 0.9rem; color: var(--text-muted); transition: var(--transition); display: inline-block; padding: 4px 0; }
        .footer-link:hover { color: var(--neon-cyan); }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            margin-top: 40px;
            padding-top: 24px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== CMS List ===== */
        .cms-item {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition);
        }
        .cms-item:last-child { border-bottom: none; }
        .cms-item:hover { padding-left: 8px; }
        .cms-item .cms-tag {
            flex-shrink: 0;
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 100px;
            background: rgba(0, 240, 255, 0.08);
            color: var(--neon-cyan);
            letter-spacing: 0.5px;
        }
        .cms-item .cms-title { font-size: 1rem; font-weight: 600; transition: var(--transition); }
        .cms-item:hover .cms-title { color: var(--neon-cyan); }
        .cms-item .cms-meta { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }
        .cms-item .cms-excerpt { font-size: 0.9rem; color: var(--text-secondary); margin-top: 6px; line-height: 1.6; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .section-padding { padding: 60px 0; }
            .hero { min-height: 70vh; }
            .hero-stats { gap: 28px; }
            .cta-section { padding: 48px 32px; }
        }

        @media (max-width: 768px) {
            .mobile-menu-btn { display: flex; }
            .nav-menu {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(8, 8, 14, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                padding: 24px 28px;
                flex-direction: column;
                gap: 16px;
                border-bottom: 1px solid var(--border-subtle);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-link { font-size: 1.1rem; padding: 12px 0; }
            .nav-link::after { display: none; }
            .nav-cta { align-self: flex-start; }
            .hero-stats { gap: 24px; }
            .hero-stat-number { font-size: 1.4rem; }
            .section-padding { padding: 48px 0; }
            .card-neon { padding: 24px 20px; }
            .feature-card { flex-direction: column; gap: 14px; }
            .cta-section { padding: 40px 24px; }
            .cms-item { flex-direction: column; gap: 10px; }
            .site-footer .grid { gap: 32px; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero-title { font-size: 2.2rem; }
            .hero-actions { flex-direction: column; width: 100%; }
            .btn-primary,.btn-secondary { width: 100%; justify-content: center; }
            .hero-stats { gap: 20px; flex-direction: column; }
            .section-title { font-size: 1.6rem; }
            .card-neon { padding: 20px 16px; }
            .cta-section { padding: 32px 20px; }
            .step-item { gap: 16px; }
            .step-item:not(:last-child)::before { left: 18px; }
        }

        /* ===== Animations ===== */
        @keyframes float {
            0%,100% { transform: translateY(0); }
            50% { transform: translateY(-12px); }
        }
        .float-anim { animation: float 6s ease-in-out infinite; }
        @keyframes pulse-glow {
            0%,100% { opacity: 0.4; }
            50% { opacity: 0.8; }
        }
        .pulse-glow { animation: pulse-glow 3s ease-in-out infinite; }

        /* ===== Tailwind Overrides ===== */
        .tw-bg-card { background-color: var(--bg-card); }
        .tw-text-neon { color: var(--neon-cyan); }
        .tw-border-subtle { border-color: var(--border-subtle); }

        /* ===== Misc ===== */
        .divider-gradient {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.2), transparent);
            margin: 0 auto;
        }
        .tag-pill {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 500;
            padding: 4px 14px;
            border-radius: 100px;
            background: rgba(0, 240, 255, 0.06);
            color: var(--neon-cyan);
            border: 1px solid rgba(0, 240, 255, 0.1);
        }
        .tag-pill.purple {
            background: rgba(168, 85, 247, 0.06);
            color: var(--neon-purple);
            border-color: rgba(168, 85, 247, 0.1);
        }
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
        }
        .empty-state i { font-size: 2.5rem; margin-bottom: 16px; opacity: 0.4; }

/* roulang page: article */
:root {
            --bg-primary: #0a0e1a;
            --bg-card: #111827;
            --bg-el: #1e293b;
            --neon-cyan: #00e5ff;
            --neon-purple: #8b5cf6;
            --neon-pink: #f472b6;
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --border-subtle: rgba(148, 163, 184, 0.15);
            --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.15);
            --radius-card: 1rem;
            --radius-sm: 0.5rem;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .text-gradient-soft {
            background: linear-gradient(135deg, #22d3ee, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .glow-border {
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
        }
        .glow-border:hover {
            border-color: var(--neon-cyan);
            box-shadow: var(--shadow-glow);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.75rem;
            background: linear-gradient(135deg, var(--neon-cyan), #06b6d4);
            color: #0a0e1a;
            font-weight: 600;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            font-size: 0.95rem;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(0, 229, 255, 0.3);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--neon-cyan);
            outline-offset: 3px;
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.5rem;
            background: transparent;
            color: var(--neon-cyan);
            font-weight: 500;
            border-radius: var(--radius-sm);
            border: 1px solid var(--neon-cyan);
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            font-size: 0.9rem;
        }
        .btn-outline:hover {
            background: rgba(0, 229, 255, 0.1);
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .btn-outline:focus-visible {
            outline: 2px solid var(--neon-cyan);
            outline-offset: 3px;
        }
        .badge {
            display: inline-block;
            padding: 0.25rem 0.85rem;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 500;
            letter-spacing: 0.02em;
            transition: var(--transition);
        }
        .badge-cyan {
            background: rgba(0, 229, 255, 0.12);
            color: var(--neon-cyan);
            border: 1px solid rgba(0, 229, 255, 0.2);
        }
        .badge-purple {
            background: rgba(139, 92, 246, 0.12);
            color: var(--neon-purple);
            border: 1px solid rgba(139, 92, 246, 0.2);
        }
        .badge-pink {
            background: rgba(244, 114, 182, 0.12);
            color: var(--neon-pink);
            border: 1px solid rgba(244, 114, 182, 0.2);
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            line-height: 1.3;
        }
        .section-subtitle {
            color: var(--text-secondary);
            font-size: 1rem;
            max-width: 600px;
            line-height: 1.6;
        }
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-card);
            padding: 1.5rem;
            transition: var(--transition);
        }
        .card:hover {
            border-color: rgba(0, 229, 255, 0.2);
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
            transform: translateY(-2px);
        }
        .nav-link {
            position: relative;
            color: var(--text-secondary);
            font-size: 0.9rem;
            font-weight: 500;
            text-decoration: none;
            padding: 0.35rem 0;
            transition: var(--transition);
            letter-spacing: 0.01em;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--neon-cyan);
            border-radius: 2px;
            transition: var(--transition);
            box-shadow: 0 0 8px var(--neon-cyan);
        }
        .nav-link:hover {
            color: var(--text-primary);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: var(--neon-cyan);
        }
        .nav-link.active::after {
            width: 100%;
            background: var(--neon-cyan);
            box-shadow: 0 0 12px var(--neon-cyan);
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.55rem 1.25rem;
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.12), rgba(139, 92, 246, 0.12));
            color: var(--neon-cyan);
            font-weight: 600;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(0, 229, 255, 0.2);
            text-decoration: none;
            transition: var(--transition);
            font-size: 0.85rem;
        }
        .nav-cta:hover {
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.22), rgba(139, 92, 246, 0.22));
            border-color: var(--neon-cyan);
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
            color: #fff;
        }
        .nav-cta:focus-visible {
            outline: 2px solid var(--neon-cyan);
            outline-offset: 3px;
        }
        .site-header {
            background: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(148, 163, 184, 0.08);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 0.75rem 0;
        }
        .footer-link {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.85rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .footer-link:hover {
            color: var(--neon-cyan);
        }
        .footer-heading {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
            letter-spacing: 0.02em;
        }
        .footer-brand {
            font-size: 1.4rem;
            font-weight: 700;
            letter-spacing: -0.02em;
        }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.85rem;
            line-height: 1.7;
        }
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-subtle);
            padding: 3.5rem 0 2rem;
        }
        .divider {
            height: 1px;
            background: var(--border-subtle);
            margin: 2rem 0;
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: #e2e8f0;
        }
        .article-body h2,
        .article-body h3,
        .article-body h4 {
            color: var(--text-primary);
            font-weight: 700;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
            letter-spacing: -0.01em;
        }
        .article-body h2 {
            font-size: 1.5rem;
        }
        .article-body h3 {
            font-size: 1.25rem;
        }
        .article-body p {
            margin-bottom: 1.25rem;
            color: #cbd5e1;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 1.25rem;
            padding-left: 1.5rem;
            color: #cbd5e1;
        }
        .article-body li {
            margin-bottom: 0.4rem;
        }
        .article-body a {
            color: var(--neon-cyan);
            text-decoration: underline;
            text-underline-offset: 2px;
            transition: var(--transition);
        }
        .article-body a:hover {
            color: #fff;
            text-shadow: 0 0 8px rgba(0, 229, 255, 0.3);
        }
        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-sm);
            margin: 1.5rem 0;
            border: 1px solid var(--border-subtle);
        }
        .article-body blockquote {
            border-left: 3px solid var(--neon-cyan);
            background: rgba(0, 229, 255, 0.04);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: #94a3b8;
            font-style: italic;
        }
        .article-body code {
            background: rgba(148, 163, 184, 0.1);
            padding: 0.15rem 0.5rem;
            border-radius: 0.25rem;
            font-size: 0.9em;
            color: var(--neon-pink);
        }
        .article-body pre {
            background: rgba(0, 0, 0, 0.3);
            padding: 1.25rem;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            border: 1px solid var(--border-subtle);
            margin: 1.5rem 0;
        }
        .article-body pre code {
            background: none;
            padding: 0;
            color: #e2e8f0;
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
        }
        .article-body th,
        .article-body td {
            padding: 0.75rem 1rem;
            border: 1px solid var(--border-subtle);
            text-align: left;
        }
        .article-body th {
            background: rgba(0, 229, 255, 0.06);
            color: var(--neon-cyan);
            font-weight: 600;
        }
        .article-body td {
            color: #cbd5e1;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            flex-wrap: wrap;
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .breadcrumb a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--neon-cyan);
        }
        .breadcrumb .sep {
            color: var(--text-muted);
            font-size: 0.7rem;
        }
        .breadcrumb .current {
            color: var(--text-primary);
            font-weight: 500;
            max-width: 260px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .pagination-nav a {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.5rem 1rem;
            background: var(--bg-el);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .pagination-nav a:hover {
            border-color: var(--neon-cyan);
            color: var(--neon-cyan);
            box-shadow: var(--shadow-glow);
        }
        .tag-item {
            display: inline-block;
            padding: 0.3rem 0.9rem;
            background: rgba(148, 163, 184, 0.06);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            color: var(--text-secondary);
            font-size: 0.78rem;
            text-decoration: none;
            transition: var(--transition);
        }
        .tag-item:hover {
            border-color: var(--neon-cyan);
            color: var(--neon-cyan);
            background: rgba(0, 229, 255, 0.06);
        }
        .recommend-card {
            background: var(--bg-el);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            padding: 1.25rem;
            transition: var(--transition);
            text-decoration: none;
            display: block;
        }
        .recommend-card:hover {
            border-color: rgba(0, 229, 255, 0.2);
            transform: translateY(-2px);
            box-shadow: 0 6px 30px rgba(0, 0, 0, 0.25);
        }
        .recommend-card .r-title {
            color: var(--text-primary);
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.4;
            transition: var(--transition);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .recommend-card:hover .r-title {
            color: var(--neon-cyan);
        }
        .recommend-card .r-meta {
            color: var(--text-muted);
            font-size: 0.78rem;
        }
        .meta-icon {
            color: var(--text-muted);
            width: 1rem;
            text-align: center;
        }
        .not-found-box {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-card);
            padding: 3rem 2rem;
            text-align: center;
        }
        .not-found-box .nf-icon {
            font-size: 3rem;
            color: var(--text-muted);
            margin-bottom: 1rem;
        }
        @media (max-width: 1024px) {
            .container {
                padding: 0 1.25rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 768px) {
            .site-header .nav-menu {
                gap: 0.8rem;
                flex-wrap: wrap;
                justify-content: center;
            }
            .site-header .nav-link {
                font-size: 0.8rem;
            }
            .site-header .nav-cta {
                font-size: 0.75rem;
                padding: 0.4rem 0.9rem;
            }
            .site-footer .grid {
                grid-template-columns: 1fr 1fr;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .article-body {
                font-size: 0.98rem;
            }
            .breadcrumb .current {
                max-width: 180px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            .site-header .nav-menu {
                gap: 0.5rem;
            }
            .site-header .nav-link {
                font-size: 0.72rem;
                padding: 0.2rem 0;
            }
            .site-header .nav-cta {
                font-size: 0.68rem;
                padding: 0.3rem 0.7rem;
                gap: 0.3rem;
            }
            .site-footer .grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .section-title {
                font-size: 1.15rem;
            }
            .article-body {
                font-size: 0.92rem;
            }
            .breadcrumb {
                font-size: 0.72rem;
            }
            .breadcrumb .current {
                max-width: 120px;
            }
            .badge {
                font-size: 0.68rem;
                padding: 0.18rem 0.6rem;
            }
            .not-found-box {
                padding: 2rem 1rem;
            }
        }
        @media (max-width: 400px) {
            .site-header .nav-menu {
                gap: 0.3rem;
            }
            .site-header .nav-link {
                font-size: 0.65rem;
            }
            .site-header .nav-cta {
                font-size: 0.6rem;
                padding: 0.25rem 0.6rem;
            }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --bg-primary: #0a0e17;
            --bg-secondary: #111827;
            --bg-card: #1a1f2e;
            --bg-card-hover: #1f2537;
            --neon-cyan: #00f0ff;
            --neon-cyan-dim: rgba(0, 240, 255, 0.15);
            --neon-cyan-glow: rgba(0, 240, 255, 0.25);
            --accent-blue: #3b82f6;
            --accent-purple: #8b5cf6;
            --text-primary: #f1f5f9;
            --text-secondary: #cbd5e1;
            --text-muted: #6b7280;
            --text-on-dark: #e2e8f0;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-cyan: rgba(0, 240, 255, 0.3);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== Base 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-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
        }

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

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

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

        ul,
        ol {
            list-style: none;
        }

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

        .text-gradient {
            background: linear-gradient(135deg, var(--neon-cyan), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .text-neon {
            color: var(--neon-cyan);
        }

        .bg-glass {
            background: rgba(17, 24, 39, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-subtle);
        }

        .section-padding {
            padding: 80px 0;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 48px auto;
            text-align: center;
        }

        .glow-line {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--neon-cyan), var(--accent-purple));
            border-radius: 4px;
            margin: 0 auto 16px auto;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(10, 14, 23, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition);
        }

        .site-header.scrolled {
            background: rgba(10, 14, 23, 0.97);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 1.35rem;
            font-weight: 700;
            letter-spacing: -0.02em;
        }

        .logo-link .brand-name {
            font-size: 1.4rem;
        }

        .logo-link .brand-sub {
            font-size: 0.8rem;
            color: var(--text-muted);
            font-weight: 400;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
            letter-spacing: 0.01em;
        }

        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
        }

        .nav-link.active {
            color: var(--neon-cyan);
            background: var(--neon-cyan-dim);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.06);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--neon-cyan);
            border-radius: 2px;
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            background: linear-gradient(135deg, var(--neon-cyan), #06b6d4);
            color: #0a0e17;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(0, 240, 255, 0.25);
        }

        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(0, 240, 255, 0.4);
            color: #0a0e17;
        }

        .nav-cta i {
            font-size: 0.9rem;
        }

        /* Mobile hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero ===== */
        .hero-section {
            padding-top: calc(var(--header-height) + 40px);
            padding-bottom: 80px;
            background: linear-gradient(180deg, #0a0e17 0%, #111827 100%);
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.06), transparent 70%);
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(139, 92, 246, 0.05), transparent 70%);
            pointer-events: none;
        }

        .hero-inner {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 860px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 0.82rem;
            font-weight: 500;
            color: var(--neon-cyan);
            background: var(--neon-cyan-dim);
            border: 1px solid var(--border-cyan);
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: 20px;
        }

        .hero-title .highlight {
            background: linear-gradient(135deg, var(--neon-cyan), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 36px auto;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            background: linear-gradient(135deg, var(--neon-cyan), #06b6d4);
            color: #0a0e17;
            transition: var(--transition);
            box-shadow: 0 4px 24px rgba(0, 240, 255, 0.3);
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 40px rgba(0, 240, 255, 0.45);
            color: #0a0e17;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            background: transparent;
            border: 1.5px solid var(--border-subtle);
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-outline:hover {
            border-color: var(--neon-cyan);
            color: var(--neon-cyan);
            background: var(--neon-cyan-dim);
            transform: translateY(-2px);
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 48px;
            margin-top: 48px;
            padding-top: 40px;
            border-top: 1px solid var(--border-subtle);
        }

        .stat-item {
            text-align: center;
        }

        .stat-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--neon-cyan);
            line-height: 1.2;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ===== Card ===== */
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
        }

        .card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 240, 255, 0.15);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }

        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--neon-cyan);
            background: var(--neon-cyan-dim);
            margin-bottom: 16px;
        }

        .card-title {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .card-desc {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Steps ===== */
        .step-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }

        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 32px 24px 28px;
            text-align: center;
            transition: var(--transition);
            position: relative;
        }

        .step-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 240, 255, 0.12);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }

        .step-number {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 700;
            color: #0a0e17;
            background: linear-gradient(135deg, var(--neon-cyan), #06b6d4);
            margin: 0 auto 16px auto;
            box-shadow: 0 4px 20px rgba(0, 240, 255, 0.25);
        }

        .step-title {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .step-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

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

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

        /* ===== Advantages ===== */
        .adv-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .adv-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 18px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .adv-item:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 240, 255, 0.1);
        }

        .adv-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
            color: var(--neon-cyan);
            background: var(--neon-cyan-dim);
            flex-shrink: 0;
            margin-top: 2px;
        }

        .adv-text h4 {
            font-size: 0.98rem;
            font-weight: 600;
            margin-bottom: 2px;
        }

        .adv-text p {
            font-size: 0.86rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            padding: 0;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(0, 240, 255, 0.1);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-primary);
            background: none;
            border: none;
            cursor: pointer;
            text-align: left;
            transition: var(--transition);
            gap: 16px;
        }

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

        .faq-question .faq-toggle {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-item.active .faq-toggle {
            transform: rotate(180deg);
            color: var(--neon-cyan);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px 24px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.04), rgba(139, 92, 246, 0.04));
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }

        .cta-box {
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.06), rgba(139, 92, 246, 0.06));
            border: 1px solid var(--border-cyan);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            box-shadow: var(--shadow-glow);
        }

        .cta-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 540px;
            margin: 0 auto 32px auto;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-subtle);
            padding: 60px 0 32px;
        }

        .footer-brand {
            display: flex;
            align-items: baseline;
            gap: 6px;
            font-size: 1.25rem;
            font-weight: 700;
        }

        .footer-desc {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-heading {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }

        .footer-link {
            font-size: 0.88rem;
            color: var(--text-muted);
            transition: var(--transition);
            display: inline-block;
            padding: 2px 0;
        }

        .footer-link:hover {
            color: var(--neon-cyan);
        }

        .footer-bottom {
            margin-top: 48px;
            padding-top: 24px;
            border-top: 1px solid var(--border-subtle);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .step-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-title {
                font-size: 2.6rem;
            }
        }

        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }

            .nav-menu {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(10, 14, 23, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 24px 32px 32px;
                gap: 12px;
                border-bottom: 1px solid var(--border-subtle);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
                box-shadow: 0 20px 48px rgba(0, 0, 0, 0.6);
            }

            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }

            .nav-link {
                width: 100%;
                text-align: left;
                padding: 12px 16px;
                font-size: 1rem;
            }

            .nav-link.active::after {
                display: none;
            }

            .nav-cta {
                width: 100%;
                justify-content: center;
                margin-top: 8px;
            }

            .hero-title {
                font-size: 2rem;
            }

            .hero-desc {
                font-size: 1rem;
            }

            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
            }

            .grid-cols-3 {
                grid-template-columns: 1fr;
            }

            .grid-cols-2 {
                grid-template-columns: 1fr;
            }

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

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

            .section-padding {
                padding: 48px 0;
            }

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

            .cta-box {
                padding: 36px 24px;
            }

            .cta-title {
                font-size: 1.5rem;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .hero-title {
                font-size: 1.65rem;
            }

            .hero-actions {
                flex-direction: column;
                width: 100%;
            }

            .btn-primary,
            .btn-outline {
                width: 100%;
                justify-content: center;
            }

            .stat-number {
                font-size: 1.5rem;
            }
        }

        /* ===== Animations ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate-fade-up {
            animation: fadeInUp 0.7s ease forwards;
        }

        .delay-1 {
            animation-delay: 0.1s;
        }
        .delay-2 {
            animation-delay: 0.2s;
        }
        .delay-3 {
            animation-delay: 0.3s;
        }
        .delay-4 {
            animation-delay: 0.4s;
        }

        /* ===== Misc ===== */
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.78rem;
            font-weight: 500;
            color: var(--neon-cyan);
            background: var(--neon-cyan-dim);
            border: 1px solid var(--border-cyan);
        }

        .divider-gradient {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.2), transparent);
            margin: 0 auto;
        }

        /* Scroll padding for anchor links */
        #features,
        #steps,
        #advantages,
        #faq,
        #cta {
            scroll-margin-top: calc(var(--header-height) + 24px);
        }

/* roulang page: category2 */
:root {
            --neon-cyan: #00e5ff;
            --neon-purple: #b388ff;
            --neon-pink: #ff4081;
            --bg-dark: #0b0e1a;
            --bg-card: #11162b;
            --bg-elevated: #161c38;
            --text-primary: #f0f4ff;
            --text-secondary: #b0bcdb;
            --text-muted: #6b7a9a;
            --border-subtle: rgba(0, 229, 255, 0.15);
            --border-glow: rgba(0, 229, 255, 0.35);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 229, 255, 0.06);
            --shadow-glow: 0 0 30px rgba(0, 229, 255, 0.08);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
            background: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .text-glow {
            text-shadow: 0 0 40px rgba(0, 229, 255, 0.15);
        }
        .bg-blur {
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
        }
        .border-glow {
            border-color: var(--border-glow);
        }
        .shadow-card {
            box-shadow: var(--shadow-card);
        }
        .shadow-glow {
            box-shadow: var(--shadow-glow);
        }
        .transition {
            transition: var(--transition);
        }

        /* header / nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(11, 14, 26, 0.88);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid var(--border-subtle);
        }
        .nav-link {
            position: relative;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 2px;
            letter-spacing: 0.3px;
            transition: var(--transition);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--neon-cyan);
            box-shadow: 0 0 12px var(--neon-cyan);
            transition: var(--transition);
            border-radius: 2px;
        }
        .nav-link:hover {
            color: var(--text-primary);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: var(--neon-cyan);
        }
        .nav-link.active::after {
            width: 100%;
            background: var(--neon-cyan);
            box-shadow: 0 0 20px var(--neon-cyan);
        }
        .nav-cta {
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(179, 136, 255, 0.10));
            border: 1px solid var(--border-glow);
            padding: 8px 20px;
            border-radius: 50px;
            color: var(--neon-cyan);
            font-weight: 600;
            transition: var(--transition);
            gap: 8px;
        }
        .nav-cta:hover {
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.25), rgba(179, 136, 255, 0.18));
            box-shadow: 0 0 30px rgba(0, 229, 255, 0.10);
            transform: scale(1.03);
            color: #fff;
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 4px;
        }
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(11, 14, 26, 0.96);
                backdrop-filter: blur(24px);
                padding: 20px 24px;
                border-bottom: 1px solid var(--border-subtle);
                gap: 16px !important;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-cta {
                align-self: flex-start;
                margin-top: 8px;
            }
        }
        @media (max-width: 520px) {
            .nav-menu {
                padding: 16px;
                gap: 12px !important;
            }
            .nav-link {
                font-size: 0.85rem;
            }
            .nav-cta {
                font-size: 0.8rem;
                padding: 6px 16px;
            }
        }

        /* hero */
        .hero-section {
            position: relative;
            padding: 100px 0 80px;
            background: radial-gradient(ellipse at 30% 20%, rgba(0, 229, 255, 0.05) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 80%, rgba(179, 136, 255, 0.04) 0%, transparent 50%);
            border-bottom: 1px solid var(--border-subtle);
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.03), transparent 70%);
            pointer-events: none;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid var(--border-subtle);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--neon-cyan);
            font-weight: 500;
            letter-spacing: 0.5px;
        }
        .hero-title {
            font-size: clamp(2.2rem, 5.5vw, 3.8rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.5px;
        }
        .hero-sub {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.8;
        }
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 16px;
            margin-top: 40px;
        }
        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px 18px;
            text-align: center;
            transition: var(--transition);
        }
        .stat-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--neon-cyan);
        }
        .stat-label {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 4px;
            letter-spacing: 0.3px;
        }

        /* section */
        .section-padding {
            padding: 80px 0;
        }
        .section-label {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--neon-cyan);
            background: rgba(0, 229, 255, 0.08);
            padding: 4px 14px;
            border-radius: 50px;
            border: 1px solid var(--border-subtle);
            margin-bottom: 12px;
        }
        .section-title {
            font-size: clamp(1.6rem, 3vw, 2.4rem);
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.3px;
        }
        .section-desc {
            color: var(--text-secondary);
            font-size: 1rem;
            max-width: 680px;
            line-height: 1.8;
        }

        /* card */
        .card-base {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
        }
        .card-base:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }
        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid var(--border-subtle);
            color: var(--neon-cyan);
        }
        .card-title {
            font-size: 1.05rem;
            font-weight: 600;
            margin-top: 16px;
        }
        .card-text {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            margin-top: 8px;
        }

        /* tag */
        .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 500;
            background: rgba(0, 229, 255, 0.06);
            border: 1px solid var(--border-subtle);
            color: var(--text-secondary);
            letter-spacing: 0.3px;
        }
        .tag-cyan {
            background: rgba(0, 229, 255, 0.12);
            border-color: rgba(0, 229, 255, 0.25);
            color: var(--neon-cyan);
        }

        /* faq */
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: var(--border-glow);
        }
        .faq-question {
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            color: var(--text-primary);
        }
        .faq-question i {
            color: var(--neon-cyan);
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .faq-answer {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.8;
            margin-top: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--border-subtle);
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* cta */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.04), rgba(179, 136, 255, 0.03));
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60%;
            left: -20%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.04), transparent 70%);
            pointer-events: none;
        }
        .cta-title {
            font-size: clamp(1.4rem, 2.5vw, 2rem);
            font-weight: 700;
        }
        .cta-desc {
            color: var(--text-secondary);
            max-width: 520px;
            margin: 12px auto 0;
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--neon-cyan), #00b0d6);
            color: #0b0e1a;
            font-weight: 700;
            padding: 12px 32px;
            border-radius: 50px;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
            letter-spacing: 0.3px;
        }
        .btn-primary:hover {
            transform: scale(1.04);
            box-shadow: 0 0 40px rgba(0, 229, 255, 0.25);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: transparent;
            color: var(--neon-cyan);
            font-weight: 600;
            padding: 12px 28px;
            border-radius: 50px;
            font-size: 0.9rem;
            border: 1px solid var(--border-glow);
            transition: var(--transition);
            text-decoration: none;
        }
        .btn-secondary:hover {
            background: rgba(0, 229, 255, 0.06);
            box-shadow: 0 0 30px rgba(0, 229, 255, 0.06);
        }

        /* footer */
        .site-footer {
            background: rgba(11, 14, 26, 0.7);
            border-top: 1px solid var(--border-subtle);
            padding: 60px 0 30px;
            margin-top: 60px;
        }
        .footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.85rem;
            line-height: 1.7;
            max-width: 280px;
        }
        .footer-heading {
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }
        .footer-link {
            color: var(--text-muted);
            font-size: 0.85rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-link:hover {
            color: var(--neon-cyan);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 24px;
            margin-top: 40px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        @media (max-width: 768px) {
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section {
                padding: 40px 20px;
            }
            .hero-section {
                padding: 70px 0 50px;
            }
            .section-padding {
                padding: 50px 0;
            }
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .hero-stats {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .stat-card {
                padding: 14px 12px;
            }
            .stat-number {
                font-size: 1.4rem;
            }
            .card-base {
                padding: 20px 16px;
            }
            .faq-item {
                padding: 16px 18px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 10px 22px;
                font-size: 0.85rem;
            }
        }

        /* breadcrumb */
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .breadcrumb a {
            color: var(--text-muted);
            text-decoration: none;
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--neon-cyan);
        }
        .breadcrumb span {
            color: var(--text-secondary);
        }
        .breadcrumb i {
            font-size: 0.6rem;
            color: var(--text-muted);
        }

        /* grid gap */
        .grid-gap {
            gap: 24px;
        }
        @media (max-width: 768px) {
            .grid-gap {
                gap: 16px;
            }
        }

        /* feature list */
        .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        .feature-list li:last-child {
            border-bottom: none;
        }
        .feature-list li i {
            color: var(--neon-cyan);
            font-size: 0.85rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* img placeholder */
        .img-placeholder {
            background: var(--bg-elevated);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 0.85rem;
            min-height: 200px;
            border: 1px solid var(--border-subtle);
            overflow: hidden;
        }
        .img-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* responsive grid helpers */
        @media (max-width: 640px) {
            .sm\:grid-cols-1 {
                grid-template-columns: 1fr !important;
            }
        }

/* roulang page: category3 */
/* ===== 设计变量 ===== */
        :root {
            --bg-primary: #0b0e1a;
            --bg-secondary: #111628;
            --bg-card: #151c30;
            --bg-card-hover: #1a2238;
            --neon-cyan: #00f0ff;
            --neon-purple: #a855f7;
            --neon-blue: #3b82f6;
            --accent-gradient: linear-gradient(135deg, #00f0ff, #a855f7);
            --text-primary: #f0f4ff;
            --text-secondary: #b0bcdd;
            --text-muted: #6a7ba0;
            --border-subtle: rgba(0, 240, 255, 0.15);
            --border-active: rgba(0, 240, 255, 0.4);
            --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.08);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 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: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
        }

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

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

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

        /* ===== 容器 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ===== 文字渐变色 ===== */
        .text-gradient {
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .text-glow {
            text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
        }

        /* ===== 霓虹强调线 ===== */
        .neon-underline {
            display: inline-block;
            position: relative;
        }
        .neon-underline::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-gradient);
            border-radius: 2px;
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

        /* ===== 导航 ===== */
        .site-header {
            background: rgba(11, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        .site-header .logo {
            font-size: 1.5rem;
            font-weight: 700;
            letter-spacing: -0.02em;
        }

        .site-header .logo-sub {
            font-size: 0.85rem;
            font-weight: 400;
            color: var(--text-muted);
            margin-left: 6px;
        }

        .nav-link {
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 6px 2px;
            position: relative;
            transition: var(--transition-fast);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0%;
            height: 2px;
            background: var(--accent-gradient);
            border-radius: 2px;
            transition: var(--transition-smooth);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
        }
        .nav-link:hover {
            color: #fff;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: #fff;
        }
        .nav-link.active::after {
            width: 100%;
            background: var(--accent-gradient);
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.6);
        }

        .nav-cta {
            background: var(--accent-gradient);
            color: #0b0e1a !important;
            font-weight: 600;
            padding: 10px 22px;
            border-radius: 50px;
            transition: var(--transition-smooth);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
        }
        .nav-cta:hover {
            transform: scale(1.04);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
        }
        .nav-cta i {
            font-size: 0.9rem;
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            font-size: 1.3rem;
            cursor: pointer;
            transition: var(--transition-fast);
            display: none;
            align-items: center;
            justify-content: center;
        }
        .menu-toggle:hover {
            border-color: var(--neon-cyan);
            background: rgba(0, 240, 255, 0.06);
        }

        /* ===== 按钮通用 ===== */
        .btn-primary {
            background: var(--accent-gradient);
            color: #0b0e1a;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: 50px;
            border: none;
            cursor: pointer;
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.12);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.25);
        }

        .btn-outline {
            background: transparent;
            color: var(--neon-cyan);
            font-weight: 600;
            padding: 12px 28px;
            border-radius: 50px;
            border: 1.5px solid var(--neon-cyan);
            cursor: pointer;
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-outline:hover {
            background: rgba(0, 240, 255, 0.08);
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.15);
            transform: translateY(-2px);
        }

        /* ===== 卡片通用 ===== */
        .card-glass {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition-smooth);
        }
        .card-glass:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-active);
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }

        /* ===== 徽章/标签 ===== */
        .badge {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(0, 240, 255, 0.1);
            color: var(--neon-cyan);
            border: 1px solid rgba(0, 240, 255, 0.2);
            letter-spacing: 0.3px;
        }
        .badge-purple {
            background: rgba(168, 85, 247, 0.12);
            color: var(--neon-purple);
            border-color: rgba(168, 85, 247, 0.25);
        }

        /* ===== 评分星级 ===== */
        .star-rating {
            display: inline-flex;
            gap: 3px;
            color: #fbbf24;
            font-size: 1rem;
        }
        .star-rating .star-empty {
            color: rgba(255, 255, 255, 0.15);
        }

        /* ===== 统计数字 ===== */
        .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }

        /* ===== 板块间距 ===== */
        .section-padding {
            padding: 80px 0;
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            transition: var(--transition-smooth);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: var(--border-active);
            background: var(--bg-card-hover);
        }
        .faq-question {
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-question i {
            color: var(--neon-cyan);
            transition: var(--transition-smooth);
        }
        .faq-answer {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-top: 12px;
            line-height: 1.8;
            border-top: 1px solid var(--border-subtle);
            padding-top: 14px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-subtle);
            padding: 60px 0 30px;
        }
        .footer-brand {
            font-size: 1.5rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-heading {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 16px;
            color: #fff;
            letter-spacing: 0.3px;
        }
        .footer-link {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: var(--transition-fast);
        }
        .footer-link:hover {
            color: var(--neon-cyan);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 24px;
            margin-top: 40px;
            color: var(--text-muted);
            font-size: 0.85rem;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }

        /* ===== Hero 区域 ===== */
        .hero-section {
            position: relative;
            padding: 100px 0 80px;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.06), transparent 70%);
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(168, 85, 247, 0.05), transparent 70%);
            pointer-events: none;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .container {
                padding-left: 20px;
                padding-right: 20px;
            }
            .section-padding {
                padding: 60px 0;
            }
            .hero-section {
                padding: 80px 0 60px;
            }
            .stat-number {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                align-items: stretch;
                background: var(--bg-secondary);
                border: 1px solid var(--border-subtle);
                border-radius: var(--radius-md);
                padding: 16px;
                gap: 8px;
                position: absolute;
                top: 68px;
                left: 16px;
                right: 16px;
                box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-link {
                padding: 10px 14px;
                border-radius: var(--radius-sm);
            }
            .nav-link::after {
                display: none;
            }
            .nav-link.active {
                background: rgba(0, 240, 255, 0.08);
            }
            .nav-cta {
                justify-content: center;
                margin-top: 4px;
            }
            .hero-section {
                padding: 60px 0 40px;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .site-footer .grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section-padding {
                padding: 40px 0;
            }
            .hero-section {
                padding: 48px 0 32px;
            }
            .site-footer .grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                justify-content: center;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .card-glass {
                padding: 20px 16px;
            }
        }

        /* ===== 选中高亮轮廓 ===== */
        :focus-visible {
            outline: 2px solid var(--neon-cyan);
            outline-offset: 2px;
        }

        /* ===== 滚动条 ===== */
        ::-webkit-scrollbar {
            width: 6px;
            background: var(--bg-primary);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--neon-cyan);
            border-radius: 10px;
            opacity: 0.5;
        }

        /* ===== 隐藏工具类 ===== */
        .hidden-mobile {
            display: flex;
        }
        @media (max-width: 768px) {
            .hidden-mobile {
                display: none !important;
            }
        }