/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #00f0ff;
            --primary-dark: #00b8c7;
            --primary-glow: rgba(0, 240, 255, 0.25);
            --secondary: #ff2d95;
            --secondary-glow: rgba(255, 45, 149, 0.25);
            --accent: #7c3aed;
            --accent-glow: rgba(124, 58, 237, 0.3);
            --bg-dark: #0a0e17;
            --bg-card: #111827;
            --bg-card-hover: #1a2235;
            --bg-surface: #0f1724;
            --border-color: #1e293b;
            --border-glow: rgba(0, 240, 255, 0.15);
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 40px rgba(0, 240, 255, 0.08);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            background: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; letter-spacing: -0.01em; }

        /* ===== Container ===== */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }
        .container-narrow { max-width: 900px; }
        .container-wide { max-width: 1360px; }

        /* ===== Section Spacing ===== */
        .section { padding: 80px 0; }
        .section-header { text-align: center; margin-bottom: 56px; }
        .section-header h2 { font-size: 2.4rem; margin-bottom: 12px; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .section-header p { font-size: 1.1rem; color: var(--text-secondary); max-width: 680px; margin: 0 auto; }
        .section-header .subtitle { display: inline-block; font-size: 0.85rem; color: var(--primary); text-transform: uppercase; letter-spacing: 3px; margin-bottom: 8px; font-weight: 600; -webkit-text-fill-color: var(--primary); background: none; }

        /* ===== Navigation ===== */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            background: rgba(10, 14, 23, 0.92); backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-color);
            height: var(--nav-height);
            transition: var(--transition);
        }
        .site-header.scrolled { background: rgba(10, 14, 23, 0.98); box-shadow: 0 4px 30px rgba(0,0,0,0.6); }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            height: var(--nav-height); max-width: 1200px; margin: 0 auto; padding: 0 24px;
        }
        .logo { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.02em; color: #fff; display: flex; align-items: center; gap: 10px; }
        .logo i { color: var(--primary); font-size: 1.4rem; }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { opacity: 0.9; }
        .nav-menu { display: flex; align-items: center; gap: 8px; }
        .nav-menu a {
            padding: 10px 20px; border-radius: var(--radius-sm);
            font-size: 0.95rem; font-weight: 500; color: var(--text-secondary);
            transition: var(--transition); position: relative;
        }
        .nav-menu a:hover { color: var(--primary); background: rgba(0, 240, 255, 0.06); }
        .nav-menu a.active {
            color: var(--primary); background: rgba(0, 240, 255, 0.08);
            box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px var(--primary-glow);
        }
        .nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0a0e17 !important; font-weight: 700 !important;
            padding: 10px 28px !important; border-radius: var(--radius-sm) !important;
            box-shadow: 0 0 24px var(--primary-glow); transition: var(--transition);
        }
        .nav-cta:hover { transform: scale(1.04); box-shadow: 0 0 40px var(--primary-glow); color: #0a0e17 !important; background: linear-gradient(135deg, #00f0ff, #00b8c7); }
        .nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.8rem; cursor: pointer; padding: 4px; }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh; display: flex; align-items: center; justify-content: center;
            position: relative; padding: 120px 24px 80px; text-align: center;
            background: linear-gradient(135deg, #0a0e17 0%, #0f1724 50%, #0a0e17 100%);
            overflow: hidden;
        }
        .hero::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.18; mix-blend-mode: overlay; pointer-events: none;
        }
        .hero::after {
            content: ''; position: absolute; inset: 0;
            background: radial-gradient(ellipse at 50% 30%, rgba(0, 240, 255, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-content { position: relative; z-index: 2; max-width: 900px; }
        .hero-badge {
            display: inline-block; padding: 6px 20px; border-radius: 40px;
            background: rgba(0, 240, 255, 0.08); border: 1px solid rgba(0, 240, 255, 0.2);
            font-size: 0.85rem; color: var(--primary); letter-spacing: 2px; margin-bottom: 24px;
            text-transform: uppercase; font-weight: 600;
        }
        .hero h1 { font-size: 3.6rem; font-weight: 900; line-height: 1.15; margin-bottom: 20px; letter-spacing: -0.02em; }
        .hero h1 .highlight { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p { font-size: 1.25rem; color: var(--text-secondary); max-width: 680px; margin: 0 auto 36px; line-height: 1.8; }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
        .btn-primary {
            display: inline-flex; align-items: center; gap: 10px;
            padding: 16px 40px; border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0a0e17; font-weight: 700; font-size: 1.05rem;
            box-shadow: 0 0 40px var(--primary-glow); transition: var(--transition);
            border: none; cursor: pointer;
        }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 0 60px var(--primary-glow); color: #0a0e17; }
        .btn-secondary {
            display: inline-flex; align-items: center; gap: 10px;
            padding: 16px 40px; border-radius: var(--radius-sm);
            background: transparent; color: var(--text-primary);
            border: 1px solid var(--border-color); font-weight: 600; font-size: 1.05rem;
            transition: var(--transition); cursor: pointer;
        }
        .btn-secondary:hover { border-color: var(--primary); color: var(--primary); background: rgba(0, 240, 255, 0.04); transform: translateY(-3px); }
        .hero-stats { display: flex; flex-wrap: wrap; justify-content: center; gap: 48px; margin-top: 60px; padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.06); }
        .hero-stat { text-align: center; }
        .hero-stat .num { font-size: 2.4rem; font-weight: 900; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero-stat .label { font-size: 0.9rem; color: var(--text-muted); margin-top: 2px; }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card); border-radius: var(--radius-md);
            border: 1px solid var(--border-color); overflow: hidden;
            transition: var(--transition); box-shadow: var(--shadow-card);
        }
        .card:hover { border-color: rgba(0, 240, 255, 0.2); transform: translateY(-6px); box-shadow: 0 16px 48px rgba(0,0,0,0.6), 0 0 30px var(--primary-glow); }
        .card-image { width: 100%; height: 200px; object-fit: cover; border-radius: var(--radius-md) var(--radius-md) 0 0; }
        .card-body { padding: 24px; }
        .card-body h3 { font-size: 1.2rem; margin-bottom: 8px; font-weight: 700; }
        .card-body p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; }
        .card-tag {
            display: inline-block; padding: 2px 14px; border-radius: 40px;
            font-size: 0.75rem; font-weight: 600; letter-spacing: 0.3px;
            background: rgba(0, 240, 255, 0.08); color: var(--primary);
            margin-bottom: 10px; border: 1px solid rgba(0, 240, 255, 0.12);
        }

        /* ===== Grid / Foundation Overrides ===== */
        .grid-x { margin: 0; }
        .cell { padding: 0; }
        .grid-padding-x .cell { padding-left: 12px; padding-right: 12px; }

        /* ===== Features Section ===== */
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 20px; }
        .feature-card {
            background: var(--bg-card); border: 1px solid var(--border-color);
            border-radius: var(--radius-md); padding: 36px 28px;
            transition: var(--transition); text-align: center;
        }
        .feature-card:hover { border-color: rgba(0, 240, 255, 0.2); transform: translateY(-4px); box-shadow: 0 0 30px var(--primary-glow); }
        .feature-icon { width: 64px; height: 64px; margin: 0 auto 20px; display: flex; align-items: center; justify-content: center; border-radius: 16px; font-size: 1.8rem; background: rgba(0, 240, 255, 0.06); border: 1px solid rgba(0, 240, 255, 0.08); color: var(--primary); }
        .feature-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
        .feature-card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }

        /* ===== News / CMS List ===== */
        .news-list { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
        .news-item {
            display: flex; gap: 20px; background: var(--bg-card);
            border: 1px solid var(--border-color); border-radius: var(--radius-md);
            padding: 20px; transition: var(--transition); align-items: flex-start;
        }
        .news-item:hover { border-color: rgba(0, 240, 255, 0.2); transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,0.4); }
        .news-thumb { width: 120px; min-height: 80px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; }
        .news-info { flex: 1; min-width: 0; }
        .news-info h4 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; line-height: 1.4; }
        .news-info h4 a { color: var(--text-primary); }
        .news-info h4 a:hover { color: var(--primary); }
        .news-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
        .news-meta span { display: flex; align-items: center; gap: 4px; }
        .news-meta .cat { color: var(--primary); font-weight: 600; }
        .news-empty { grid-column: 1 / -1; text-align: center; padding: 48px; color: var(--text-muted); font-size: 1.1rem; background: var(--bg-card); border-radius: var(--radius-md); border: 1px dashed var(--border-color); }

        /* ===== Stats / Social Proof ===== */
        .stats-section { background: linear-gradient(135deg, #0f1724, #0a0e17); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
        .stat-item .number { font-size: 2.8rem; font-weight: 900; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .stat-item .desc { font-size: 0.95rem; color: var(--text-secondary); margin-top: 4px; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; transition: var(--transition); }
        .faq-item:hover { border-color: rgba(0, 240, 255, 0.15); }
        .faq-question { padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 600; font-size: 1.05rem; user-select: none; transition: var(--transition); }
        .faq-question:hover { color: var(--primary); }
        .faq-question i { font-size: 1.2rem; color: var(--primary); transition: var(--transition); }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: var(--transition); color: var(--text-secondary); line-height: 1.8; }
        .faq-item.active .faq-answer { padding: 0 24px 20px; max-height: 300px; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #0f1724, #0a0e17);
            border-top: 1px solid var(--border-color);
            text-align: center; padding: 80px 24px;
            position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: radial-gradient(ellipse at 50% 50%, rgba(0, 240, 255, 0.04) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 { font-size: 2.4rem; margin-bottom: 16px; }
        .cta-section p { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; margin: 0 auto 32px; }
        .cta-actions { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }

        /* ===== Footer ===== */
        .site-footer {
            background: #070b12; border-top: 1px solid var(--border-color);
            padding: 48px 24px 24px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: 1200px; margin: 0 auto; }
        .footer-brand .logo { font-size: 1.4rem; margin-bottom: 12px; }
        .footer-brand p { font-size: 0.9rem; color: var(--text-muted); max-width: 320px; line-height: 1.7; }
        .footer-col h4 { font-size: 0.95rem; color: var(--text-primary); margin-bottom: 16px; font-weight: 700; }
        .footer-col a { display: block; font-size: 0.9rem; color: var(--text-muted); padding: 4px 0; transition: var(--transition); }
        .footer-col a:hover { color: var(--primary); padding-left: 4px; }
        .footer-bottom { max-width: 1200px; margin: 32px auto 0; padding-top: 20px; border-top: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: var(--text-muted); }
        .footer-social { display: flex; gap: 16px; }
        .footer-social a { color: var(--text-muted); font-size: 1.2rem; transition: var(--transition); }
        .footer-social a:hover { color: var(--primary); }

        /* ===== Back to Top ===== */
        .back-top { position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px; border-radius: 50%; background: var(--bg-card); border: 1px solid var(--border-color); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; cursor: pointer; transition: var(--transition); z-index: 999; opacity: 0; pointer-events: none; }
        .back-top.visible { opacity: 1; pointer-events: auto; }
        .back-top:hover { border-color: var(--primary); box-shadow: 0 0 30px var(--primary-glow); transform: translateY(-4px); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .hero h1 { font-size: 2.8rem; }
        }

        @media (max-width: 768px) {
            .nav-menu { display: none; position: absolute; top: var(--nav-height); left: 0; right: 0; background: rgba(10, 14, 23, 0.98); backdrop-filter: blur(18px); flex-direction: column; padding: 16px 24px; border-bottom: 1px solid var(--border-color); }
            .nav-menu.open { display: flex; }
            .nav-toggle { display: block; }
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1.05rem; }
            .section { padding: 56px 0; }
            .section-header h2 { font-size: 1.8rem; }
            .features-grid { grid-template-columns: 1fr; gap: 20px; }
            .news-list { grid-template-columns: 1fr; }
            .news-item { flex-direction: column; }
            .news-thumb { width: 100%; height: 160px; }
            .hero-stats { gap: 24px; }
            .hero-stat .num { font-size: 1.8rem; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .stat-item .number { font-size: 2rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section h2 { font-size: 1.8rem; }
            .btn-primary, .btn-secondary { padding: 14px 28px; font-size: 0.95rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero { padding: 100px 16px 60px; }
            .hero h1 { font-size: 1.8rem; }
            .hero p { font-size: 0.95rem; }
            .section-header h2 { font-size: 1.5rem; }
            .feature-card { padding: 24px 20px; }
            .news-item { padding: 16px; }
            .faq-question { padding: 16px 18px; font-size: 0.95rem; }
            .back-top { bottom: 20px; right: 20px; width: 40px; height: 40px; font-size: 1rem; }
        }

        /* ===== Utility ===== */
        .text-glow { text-shadow: 0 0 40px var(--primary-glow); }
        .border-glow { border-color: rgba(0, 240, 255, 0.15); }
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #00e5ff;
            --primary-dark: #00b8d4;
            --primary-glow: rgba(0, 229, 255, 0.3);
            --secondary: #ff6e40;
            --secondary-glow: rgba(255, 110, 64, 0.3);
            --bg-dark: #0b0e17;
            --bg-card: #121823;
            --bg-card-hover: #1a2233;
            --bg-section-alt: #0f1420;
            --text-white: #f0f4ff;
            --text-light: #b0c4de;
            --text-muted: #6a7f9f;
            --border-color: #1e2a3a;
            --border-glow: rgba(0, 229, 255, 0.15);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 229, 255, 0.05);
            --shadow-card-hover: 0 12px 48px rgba(0, 229, 255, 0.12), 0 0 0 1px rgba(0, 229, 255, 0.15);
            --shadow-glow: 0 0 40px rgba(0, 229, 255, 0.08);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --header-h: 70px;
        }

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

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

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

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

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

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

        ul,
        ol {
            list-style: none;
        }

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

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

        @media screen and (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Navigation (Dark Neon) ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: rgba(11, 14, 23, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
            z-index: 1000;
            transition: var(--transition);
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-white);
            font-size: 1.4rem;
            font-weight: 800;
            letter-spacing: 0.5px;
            transition: var(--transition);
        }
        .logo i {
            color: var(--primary);
            font-size: 1.6rem;
            filter: drop-shadow(0 0 8px var(--primary-glow));
        }
        .logo span {
            background: linear-gradient(135deg, var(--text-white), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            opacity: 0.85;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-menu a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav-menu a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .nav-menu a:hover {
            color: var(--text-white);
            background: rgba(0, 229, 255, 0.06);
        }
        .nav-menu a.active {
            color: var(--primary);
            background: rgba(0, 229, 255, 0.1);
            box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px rgba(0, 229, 255, 0.08);
        }
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--primary);
            box-shadow: 0 0 12px var(--primary-glow);
            border-radius: 2px;
        }
        .nav-menu a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            font-weight: 700;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
            transition: var(--transition);
            margin-left: 8px;
        }
        .nav-menu a.nav-cta:hover {
            box-shadow: 0 0 40px rgba(0, 229, 255, 0.3);
            transform: translateY(-1px) scale(1.02);
            color: #0b0e17;
        }
        .nav-menu a.nav-cta i {
            color: inherit;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            color: var(--primary);
            background: rgba(0, 229, 255, 0.08);
        }
        .nav-toggle:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 4px;
        }

        @media screen and (max-width: 820px) {
            .nav-menu {
                position: fixed;
                top: var(--header-h);
                left: 0;
                width: 100%;
                background: rgba(11, 14, 23, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 30px;
                gap: 6px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
                transform: translateY(-120%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                z-index: 999;
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .nav-menu a {
                width: 100%;
                padding: 14px 18px;
                font-size: 1.05rem;
                border-radius: var(--radius-sm);
            }
            .nav-menu a.nav-cta {
                margin-left: 0;
                margin-top: 10px;
                text-align: center;
            }
            .nav-menu a.active::after {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
        }

        @media screen and (max-width: 520px) {
            .header-inner {
                padding: 0 12px;
            }
            .logo {
                font-size: 1.2rem;
            }
            .logo i {
                font-size: 1.3rem;
            }
            .nav-menu {
                padding: 16px 16px 24px;
            }
        }

        /* ===== Page Hero / Banner ===== */
        .page-hero {
            margin-top: var(--header-h);
            padding: 100px 0 80px;
            background: linear-gradient(160deg, #0b0e17 0%, #0f1a2e 50%, #0b0e17 100%);
            position: relative;
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 229, 255, 0.06) 0%, transparent 70%);
            z-index: 1;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 20px;
            background: linear-gradient(135deg, var(--text-white) 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: 1px;
        }
        .page-hero .hero-sub {
            font-size: 1.2rem;
            color: var(--text-light);
            max-width: 720px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }
        .page-hero .hero-badge {
            display: inline-block;
            background: rgba(0, 229, 255, 0.12);
            border: 1px solid rgba(0, 229, 255, 0.2);
            padding: 6px 20px;
            border-radius: 30px;
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }

        @media screen and (max-width: 768px) {
            .page-hero {
                padding: 80px 0 60px;
                min-height: 320px;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
            .page-hero .hero-sub {
                font-size: 1rem;
            }
        }
        @media screen and (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .page-hero .hero-sub {
                font-size: 0.95rem;
            }
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-title h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .section-title h2 i {
            color: var(--primary);
            margin-right: 10px;
            filter: drop-shadow(0 0 6px var(--primary-glow));
        }
        .section-title p {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
        }

        @media screen and (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-title h2 {
                font-size: 1.7rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
            box-shadow: var(--shadow-card);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 229, 255, 0.2);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .card .card-icon {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 16px;
            filter: drop-shadow(0 0 10px var(--primary-glow));
        }
        .card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-white);
        }
        .card p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            flex: 1;
        }
        .card .card-tag {
            display: inline-block;
            background: rgba(0, 229, 255, 0.08);
            color: var(--primary);
            padding: 2px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-top: 14px;
            align-self: flex-start;
            border: 1px solid rgba(0, 229, 255, 0.1);
        }

        /* ===== Grid Helpers (Foundation + custom) ===== */
        .grid-x {
            display: flex;
            flex-wrap: wrap;
        }
        .cell {
            flex: 0 0 auto;
            padding: 0 12px;
        }
        .medium-4 {
            width: 33.3333%;
        }
        .medium-6 {
            width: 50%;
        }
        .medium-3 {
            width: 25%;
        }
        .large-4 {
            width: 33.3333%;
        }
        .small-12 {
            width: 100%;
        }

        @media screen and (max-width: 768px) {
            .medium-4,
            .medium-3 {
                width: 50%;
            }
        }
        @media screen and (max-width: 520px) {
            .medium-4,
            .medium-3,
            .medium-6 {
                width: 100%;
            }
            .cell {
                padding: 0 8px;
            }
        }

        /* ===== Steps / Timeline ===== */
        .steps-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-color);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            transition: var(--transition);
            position: relative;
            box-shadow: var(--shadow-card);
        }
        .step-card:hover {
            border-color: rgba(0, 229, 255, 0.2);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .step-card::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: 16px;
            left: 16px;
            width: 36px;
            height: 36px;
            background: rgba(0, 229, 255, 0.12);
            border: 1px solid rgba(0, 229, 255, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1rem;
            color: var(--primary);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.06);
        }
        .step-card .step-icon {
            font-size: 2.4rem;
            color: var(--primary);
            margin-bottom: 16px;
            margin-top: 8px;
            filter: drop-shadow(0 0 10px var(--primary-glow));
        }
        .step-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        @media screen and (max-width: 900px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media screen and (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: rgba(0, 229, 255, 0.15);
        }
        .faq-item.open {
            border-color: rgba(0, 229, 255, 0.25);
            box-shadow: 0 0 30px rgba(0, 229, 255, 0.04);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            color: var(--text-white);
            font-size: 1.05rem;
            gap: 16px;
            user-select: none;
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.2rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 24px 20px 24px;
        }

        @media screen and (max-width: 520px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
            .faq-answer {
                font-size: 0.9rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 16px 16px 16px;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.15);
        }
        .btn-primary:hover {
            box-shadow: 0 0 48px rgba(0, 229, 255, 0.3);
            transform: translateY(-2px) scale(1.02);
            color: #0b0e17;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-white);
            border: 1px solid var(--border-color);
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(0, 229, 255, 0.05);
            transform: translateY(-2px);
        }
        .btn-lg {
            padding: 16px 44px;
            font-size: 1.1rem;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: linear-gradient(160deg, #0f1a2e 0%, #0b0e17 100%);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 60% 50%, rgba(0, 229, 255, 0.05) 0%, transparent 70%);
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 80px 24px;
        }
        .cta-section h2 {
            font-size: 2.4rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--text-light);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-section .btn {
            margin: 0 8px;
        }

        @media screen and (max-width: 768px) {
            .cta-section .container {
                padding: 56px 16px;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .cta-section p {
                font-size: 1rem;
            }
            .cta-section .btn {
                margin: 6px 4px;
                padding: 12px 24px;
                font-size: 0.95rem;
            }
        }

        /* ===== Stats / Data Row ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 16px;
            transition: var(--transition);
            box-shadow: var(--shadow-card);
        }
        .stat-item:hover {
            border-color: rgba(0, 229, 255, 0.15);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .stat-item .stat-num {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            filter: drop-shadow(0 0 12px var(--primary-glow));
        }
        .stat-item .stat-label {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 6px;
        }

        @media screen and (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .stat-num {
                font-size: 2.2rem;
            }
        }
        @media screen and (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 24px 12px;
            }
            .stat-item .stat-num {
                font-size: 1.8rem;
            }
        }

        /* ===== Feature Grid (图文混合) ===== */
        .feature-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 40px;
            margin-bottom: 60px;
        }
        .feature-row:last-child {
            margin-bottom: 0;
        }
        .feature-row.reverse {
            flex-direction: row-reverse;
        }
        .feature-image {
            flex: 1 1 45%;
            min-width: 280px;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
        }
        .feature-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: var(--transition);
        }
        .feature-image:hover img {
            transform: scale(1.02);
        }
        .feature-content {
            flex: 1 1 45%;
            min-width: 280px;
        }
        .feature-content h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .feature-content h3 i {
            color: var(--primary);
            margin-right: 8px;
        }
        .feature-content p {
            color: var(--text-light);
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .feature-content .feature-list {
            padding: 0;
            margin: 0;
        }
        .feature-content .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 6px 0;
            color: var(--text-light);
            font-size: 0.95rem;
        }
        .feature-content .feature-list li i {
            color: var(--primary);
            margin-top: 4px;
            flex-shrink: 0;
        }

        @media screen and (max-width: 768px) {
            .feature-row {
                gap: 24px;
                margin-bottom: 40px;
            }
            .feature-content h3 {
                font-size: 1.3rem;
            }
            .feature-image {
                flex: 1 1 100%;
                min-width: auto;
            }
            .feature-content {
                flex: 1 1 100%;
                min-width: auto;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #070a12;
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .footer-grid {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }
        .footer-brand .logo {
            font-size: 1.3rem;
            margin-bottom: 16px;
            display: inline-flex;
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.8;
            margin-top: 12px;
        }
        .footer-col h4 {
            color: var(--text-white);
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-col a i {
            margin-right: 8px;
            width: 18px;
            text-align: center;
        }
        .footer-bottom {
            max-width: var(--container-max);
            margin: 40px auto 0;
            padding: 20px 24px 0;
            border-top: 1px solid var(--border-color);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .footer-bottom .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-bottom .footer-social a {
            color: var(--text-muted);
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .footer-bottom .footer-social a:hover {
            color: var(--primary);
            transform: translateY(-2px);
        }

        @media screen and (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }
        @media screen and (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer {
                padding: 40px 0 20px;
            }
        }

        /* ===== Extra: Badge / Tag ===== */
        .badge {
            display: inline-block;
            background: rgba(0, 229, 255, 0.1);
            color: var(--primary);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            border: 1px solid rgba(0, 229, 255, 0.15);
        }

        /* ===== Responsive fine-tune ===== */
        @media screen and (max-width: 1024px) {
            .container {
                padding: 0 20px;
            }
        }
        @media screen and (max-width: 520px) {
            .container {
                padding: 0 12px;
            }
            .page-hero {
                min-height: 280px;
                padding: 70px 0 50px;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                margin-bottom: 30px;
            }
        }

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

        /* ===== Foundation Overrides ===== */
        .grid-x>.cell {
            padding: 0 12px;
        }
        .grid-x {
            margin: 0 -12px;
        }
        @media screen and (max-width: 520px) {
            .grid-x>.cell {
                padding: 0 8px;
            }
            .grid-x {
                margin: 0 -8px;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --clr-bg: #0a0a1a;
            --clr-bg-alt: #0f0f2a;
            --clr-bg-card: #14142e;
            --clr-bg-overlay: rgba(10, 10, 26, 0.85);
            --clr-surface: #1a1a3a;
            --clr-border: #2a2a5a;
            --clr-border-light: #3a3a7a;
            --clr-primary: #00f0ff;
            --clr-primary-dim: #0099aa;
            --clr-primary-glow: rgba(0, 240, 255, 0.25);
            --clr-accent: #8b5cf6;
            --clr-accent-glow: rgba(139, 92, 246, 0.25);
            --clr-highlight: #ff2d95;
            --clr-text: #e8e8f0;
            --clr-text-dim: #9090b0;
            --clr-text-muted: #606080;
            --clr-success: #22c55e;
            --clr-warning: #f59e0b;
            --clr-danger: #ef4444;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(42, 42, 90, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.15);
            --shadow-glow-accent: 0 0 20px rgba(139, 92, 246, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-main: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
            --nav-height: 70px;
            --max-width: 1200px;
            --section-gap: 80px;
        }

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

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

        body {
            font-family: var(--font-main);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

        ul,
        ol {
            list-style: none;
        }

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

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

        .container-narrow {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Site Header / 暗色霓虹导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(10, 10, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--clr-border);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
        }

        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            transition: var(--transition);
        }
        .logo i {
            color: var(--clr-primary);
            font-size: 1.6rem;
            filter: drop-shadow(0 0 8px var(--clr-primary-glow));
        }
        .logo span {
            background: linear-gradient(135deg, #fff 30%, var(--clr-primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            opacity: 0.85;
            transform: scale(1.02);
        }

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

        .nav-menu a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--clr-text-dim);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav-menu a i {
            font-size: 0.95rem;
        }
        .nav-menu a:hover {
            color: #fff;
            background: rgba(0, 240, 255, 0.06);
        }
        .nav-menu a.active {
            color: var(--clr-primary);
            background: rgba(0, 240, 255, 0.08);
            text-shadow: 0 0 20px var(--clr-primary-glow);
        }
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--clr-primary);
            box-shadow: 0 0 12px var(--clr-primary-glow);
            border-radius: 2px;
        }

        .nav-cta {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent)) !important;
            color: #fff !important;
            font-weight: 700 !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-md) !important;
            box-shadow: 0 4px 20px rgba(0, 240, 255, 0.25);
            transition: var(--transition) !important;
        }
        .nav-cta:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 8px 30px rgba(0, 240, 255, 0.35) !important;
            color: #fff !important;
        }
        .nav-cta i {
            color: #fff !important;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--clr-primary);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(0, 240, 255, 0.1);
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            min-height: 380px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 120px 24px 60px;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            isolation: isolate;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 10, 26, 0.85) 0%, rgba(10, 10, 26, 0.70) 50%, rgba(10, 10, 26, 0.92) 100%);
            z-index: 0;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center 30%, rgba(0, 240, 255, 0.04) 0%, transparent 70%);
            z-index: 0;
        }
        .article-hero * {
            position: relative;
            z-index: 1;
        }
        .article-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            background: rgba(0, 240, 255, 0.12);
            border: 1px solid rgba(0, 240, 255, 0.25);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--clr-primary);
            margin-bottom: 20px;
            letter-spacing: 0.5px;
            backdrop-filter: blur(4px);
        }
        .article-hero h1 {
            font-size: clamp(1.8rem, 4.5vw, 3.2rem);
            font-weight: 800;
            color: #fff;
            max-width: 800px;
            margin: 0 auto 16px;
            text-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
            letter-spacing: -0.5px;
            line-height: 1.2;
        }
        .article-hero .hero-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px 24px;
            font-size: 0.95rem;
            color: var(--clr-text-dim);
        }
        .article-hero .hero-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-hero .hero-meta i {
            color: var(--clr-primary);
            font-size: 0.9rem;
        }
        .article-hero .hero-meta .category-tag {
            color: var(--clr-accent);
            font-weight: 600;
        }

        /* ===== Article Content ===== */
        .article-section {
            padding: var(--section-gap) 0 40px;
        }

        .article-body {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-lg);
            padding: 40px 48px;
            box-shadow: var(--shadow-card);
        }

        .article-body .article-meta-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            padding-bottom: 24px;
            margin-bottom: 32px;
            border-bottom: 1px solid var(--clr-border);
            font-size: 0.9rem;
            color: var(--clr-text-dim);
        }
        .article-body .article-meta-bar span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-body .article-meta-bar i {
            color: var(--clr-primary-dim);
            font-size: 0.85rem;
        }
        .article-body .article-meta-bar .cat-link {
            color: var(--clr-accent);
            font-weight: 600;
        }
        .article-body .article-meta-bar .cat-link:hover {
            color: var(--clr-primary);
        }

        .article-body .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--clr-text);
        }
        .article-body .article-content p {
            margin-bottom: 1.2em;
        }
        .article-body .article-content h2,
        .article-body .article-content h3,
        .article-body .article-content h4 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: #fff;
        }
        .article-body .article-content h2 {
            font-size: 1.6rem;
            border-left: 4px solid var(--clr-primary);
            padding-left: 16px;
        }
        .article-body .article-content h3 {
            font-size: 1.3rem;
        }
        .article-body .article-content ul,
        .article-body .article-content ol {
            margin: 0.8em 0;
            padding-left: 1.6em;
        }
        .article-body .article-content li {
            margin-bottom: 0.4em;
        }
        .article-body .article-content ul li {
            list-style: disc;
        }
        .article-body .article-content ol li {
            list-style: decimal;
        }
        .article-body .article-content a {
            color: var(--clr-primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body .article-content a:hover {
            color: var(--clr-accent);
        }
        .article-body .article-content blockquote {
            border-left: 4px solid var(--clr-accent);
            padding: 12px 20px;
            margin: 1.2em 0;
            background: rgba(139, 92, 246, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--clr-text-dim);
            font-style: italic;
        }
        .article-body .article-content img {
            border-radius: var(--radius-md);
            margin: 1.5em 0;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
        }
        .article-body .article-content code {
            font-family: var(--font-mono);
            background: rgba(0, 240, 255, 0.08);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--clr-primary);
        }
        .article-body .article-content pre {
            background: #0d0d1f;
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            padding: 20px;
            overflow-x: auto;
            margin: 1.2em 0;
        }
        .article-body .article-content pre code {
            background: none;
            padding: 0;
            color: var(--clr-text);
        }

        /* ===== Article Not Found ===== */
        .article-not-found {
            text-align: center;
            padding: 80px 24px;
        }
        .article-not-found i {
            font-size: 4rem;
            color: var(--clr-text-muted);
            margin-bottom: 20px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            font-size: 1.1rem;
            color: var(--clr-text-dim);
            margin-bottom: 24px;
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
            font-weight: 700;
            border-radius: var(--radius-md);
            box-shadow: 0 4px 20px rgba(0, 240, 255, 0.25);
            transition: var(--transition);
        }
        .article-not-found .btn-back:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0, 240, 255, 0.35);
            color: #fff;
        }

        /* ===== Tags / Share ===== */
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            padding-top: 28px;
            margin-top: 32px;
            border-top: 1px solid var(--clr-border);
        }
        .article-tags .label {
            font-size: 0.9rem;
            color: var(--clr-text-dim);
            font-weight: 500;
        }
        .article-tags .tag-item {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.15);
            border-radius: 20px;
            font-size: 0.82rem;
            color: var(--clr-primary);
            transition: var(--transition);
        }
        .article-tags .tag-item:hover {
            background: rgba(0, 240, 255, 0.15);
            border-color: var(--clr-primary);
            transform: translateY(-1px);
        }

        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 16px;
        }
        .article-share .label {
            font-size: 0.9rem;
            color: var(--clr-text-dim);
            font-weight: 500;
        }
        .article-share a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--clr-surface);
            border: 1px solid var(--clr-border);
            color: var(--clr-text-dim);
            font-size: 1rem;
            transition: var(--transition);
        }
        .article-share a:hover {
            background: var(--clr-primary);
            color: #fff;
            border-color: var(--clr-primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px var(--clr-primary-glow);
        }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 60px 0 var(--section-gap);
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: 40px;
        }
        .related-section .section-title h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            display: inline-flex;
            align-items: center;
            gap: 12px;
        }
        .related-section .section-title h2 i {
            color: var(--clr-primary);
            font-size: 1.8rem;
        }
        .related-section .section-title p {
            color: var(--clr-text-dim);
            font-size: 1.05rem;
            margin-top: 8px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .related-card {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .related-card:hover {
            transform: translateY(-6px);
            border-color: var(--clr-border-light);
            box-shadow: var(--shadow-card), var(--shadow-glow);
        }
        .related-card .card-img {
            position: relative;
            width: 100%;
            aspect-ratio: 16 / 10;
            overflow: hidden;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-img .overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 12px 16px;
            background: linear-gradient(transparent, rgba(10, 10, 26, 0.8));
            display: flex;
            gap: 8px;
        }
        .related-card .card-img .overlay .tag {
            padding: 2px 10px;
            background: rgba(0, 240, 255, 0.15);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: 12px;
            font-size: 0.72rem;
            color: var(--clr-primary);
            backdrop-filter: blur(4px);
        }
        .related-card .card-body {
            padding: 18px 20px 22px;
        }
        .related-card .card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            line-height: 1.35;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body h3 a {
            color: #fff;
        }
        .related-card .card-body h3 a:hover {
            color: var(--clr-primary);
        }
        .related-card .card-body p {
            font-size: 0.88rem;
            color: var(--clr-text-dim);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .related-card .card-body .meta {
            font-size: 0.8rem;
            color: var(--clr-text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .related-card .card-body .meta i {
            color: var(--clr-primary-dim);
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 60px 24px 80px;
            text-align: center;
        }
        .cta-section .cta-card {
            max-width: 800px;
            margin: 0 auto;
            padding: 48px 40px;
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
            isolation: isolate;
        }
        .cta-section .cta-card::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(ellipse at center, rgba(0, 240, 255, 0.03) 0%, transparent 70%);
            z-index: 0;
            pointer-events: none;
        }
        .cta-section .cta-card * {
            position: relative;
            z-index: 1;
        }
        .cta-section .cta-card h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section .cta-card p {
            font-size: 1.1rem;
            color: var(--clr-text-dim);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .cta-card .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .cta-section .cta-card .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
            color: #fff;
            font-weight: 700;
            font-size: 1.05rem;
            border: none;
            border-radius: var(--radius-md);
            box-shadow: 0 4px 24px rgba(0, 240, 255, 0.25);
            transition: var(--transition);
            cursor: pointer;
        }
        .cta-section .cta-card .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 36px rgba(0, 240, 255, 0.35);
            color: #fff;
        }
        .cta-section .cta-card .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: transparent;
            color: var(--clr-primary);
            font-weight: 600;
            font-size: 1.05rem;
            border: 1px solid var(--clr-border-light);
            border-radius: var(--radius-md);
            transition: var(--transition);
            cursor: pointer;
        }
        .cta-section .cta-card .btn-secondary:hover {
            background: rgba(0, 240, 255, 0.06);
            border-color: var(--clr-primary);
            color: #fff;
            transform: translateY(-3px);
        }

        /* ===== Site Footer ===== */
        .site-footer {
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            padding: 56px 24px 24px;
        }

        .footer-grid {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
        }

        .footer-brand .logo {
            font-size: 1.4rem;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--clr-text-dim);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            position: relative;
            padding-bottom: 8px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 2px;
            background: var(--clr-primary);
            box-shadow: 0 0 10px var(--clr-primary-glow);
            border-radius: 2px;
        }
        .footer-col a {
            display: block;
            padding: 5px 0;
            font-size: 0.9rem;
            color: var(--clr-text-dim);
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--clr-primary);
            padding-left: 4px;
        }
        .footer-col a i {
            width: 20px;
            color: var(--clr-primary-dim);
        }

        .footer-bottom {
            max-width: var(--max-width);
            margin: 40px auto 0;
            padding-top: 20px;
            border-top: 1px solid var(--clr-border);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--clr-text-muted);
        }
        .footer-bottom .footer-social {
            display: flex;
            gap: 10px;
        }
        .footer-bottom .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: var(--clr-surface);
            border: 1px solid var(--clr-border);
            color: var(--clr-text-dim);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .footer-bottom .footer-social a:hover {
            background: var(--clr-primary);
            color: #fff;
            border-color: var(--clr-primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 14px var(--clr-primary-glow);
        }

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

        @media (max-width: 768px) {
            :root {
                --section-gap: 56px;
            }

            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(10, 10, 26, 0.98);
                backdrop-filter: blur(16px);
                padding: 16px 24px;
                border-bottom: 1px solid var(--clr-border);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
                gap: 4px;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 12px 16px;
                font-size: 1rem;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-menu a.active::after {
                display: none;
            }
            .nav-menu a.active {
                background: rgba(0, 240, 255, 0.1);
                border-left: 3px solid var(--clr-primary);
            }
            .nav-cta {
                margin-top: 6px;
                text-align: center;
            }

            .nav-toggle {
                display: block;
            }

            .article-hero {
                min-height: 280px;
                padding: 100px 20px 40px;
            }
            .article-hero h1 {
                font-size: 1.6rem;
            }
            .article-hero .hero-meta {
                font-size: 0.85rem;
                gap: 10px 16px;
            }

            .article-body {
                padding: 24px 20px;
            }
            .article-body .article-content {
                font-size: 0.98rem;
            }
            .article-body .article-content h2 {
                font-size: 1.3rem;
            }

            .related-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .cta-section .cta-card {
                padding: 36px 24px;
            }
            .cta-section .cta-card h2 {
                font-size: 1.5rem;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }

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

        @media (max-width: 520px) {
            .header-inner {
                padding: 0 16px;
            }
            .logo {
                font-size: 1.2rem;
            }
            .logo i {
                font-size: 1.2rem;
            }
            .container {
                padding: 0 16px;
            }
            .article-hero {
                min-height: 220px;
                padding: 90px 16px 32px;
            }
            .article-hero h1 {
                font-size: 1.35rem;
            }
            .article-body {
                padding: 18px 14px;
                border-radius: var(--radius-md);
            }
            .article-body .article-meta-bar {
                font-size: 0.82rem;
                gap: 8px 16px;
            }
            .article-tags {
                gap: 8px;
            }
            .article-tags .tag-item {
                font-size: 0.75rem;
                padding: 3px 10px;
            }
            .cta-section .cta-card {
                padding: 28px 18px;
            }
            .cta-section .cta-card .btn-primary,
            .cta-section .cta-card .btn-secondary {
                width: 100%;
                justify-content: center;
                padding: 12px 20px;
                font-size: 0.95rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                font-size: 0.75rem;
            }
            .related-section .section-title h2 {
                font-size: 1.5rem;
            }
        }

        /* ===== Foundation Overrides ===== */
        .grid-container {
            max-width: var(--max-width);
            padding-left: 0;
            padding-right: 0;
        }
        .grid-x {
            margin-left: 0;
            margin-right: 0;
        }
        .cell {
            padding-left: 0;
            padding-right: 0;
        }