/* roulang page: index */
:root {
            --color-primary: #2563eb;
            --color-primary-dark: #1d4ed8;
            --color-primary-light: #3b82f6;
            --color-accent: #06b6d4;
            --color-accent-dark: #0891b2;
            --color-surface: #f8fafc;
            --color-surface-alt: #f1f5f9;
            --color-deep: #0f172a;
            --color-deep-alt: #1e293b;
            --color-muted: #64748b;
            --color-border-soft: #e2e8f0;
            --color-white: #ffffff;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-tag: 20px;
            --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-card-hover: 0 8px 25px rgba(0,0,0,0.1), 0 2px 6px rgba(0,0,0,0.06);
            --shadow-nav: 0 1px 0 rgba(0,0,0,0.05);
            --shadow-soft: 0 4px 16px rgba(0,0,0,0.08);
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
        }
        *,*::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',Arial,'Noto Sans',sans-serif;line-height:1.6;color:var(--color-deep-alt);background:var(--color-surface);min-height:100vh}
        a{text-decoration:none;color:inherit;transition:color var(--transition-fast)}
        img{max-width:100%;height:auto;display:block}
        button,input,select,textarea{font-family:inherit;font-size:inherit}
        button{cursor:pointer;border:none;background:none}
        ul,ol{list-style:none}
        .container{width:100%;max-width:1200px;margin-left:auto;margin-right:auto;padding-left:20px;padding-right:20px}
        @media(min-width:640px){.container{padding-left:24px;padding-right:24px}}
        @media(min-width:1024px){.container{padding-left:32px;padding-right:32px}}

        /* Top info bar */
        .top-bar{background:var(--color-deep);color:#cbd5e1;font-size:0.8rem;padding:6px 0;z-index:1001;position:relative}
        .top-bar .container{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px}
        .top-bar a{color:#e2e8f0;transition:color var(--transition-fast)}
        .top-bar a:hover{color:#fff}
        .top-bar .top-bar-left{display:flex;align-items:center;gap:14px}
        .top-bar .top-bar-right{display:flex;align-items:center;gap:14px}
        .top-bar .dot-indicator{width:7px;height:7px;border-radius:50%;background:#10b981;display:inline-block;animation:pulse-dot 2s infinite}
        @keyframes pulse-dot{0%,100%{opacity:1}50%{opacity:0.4}}

        /* Main nav */
        .main-nav{background:var(--color-white);border-bottom:1px solid var(--color-border-soft);position:sticky;top:0;z-index:1000;box-shadow:var(--shadow-nav)}
        .main-nav .container{display:flex;align-items:center;justify-content:space-between;height:60px}
        .nav-logo{font-size:1.25rem;font-weight:700;color:var(--color-deep);letter-spacing:-0.02em;white-space:nowrap;display:flex;align-items:center;gap:8px}
        .nav-logo .logo-icon{width:34px;height:34px;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:0.85rem;font-weight:700}
        .nav-links{display:flex;align-items:center;gap:6px}
        .nav-links a{display:inline-flex;align-items:center;padding:8px 16px;border-radius:var(--radius-btn);font-size:0.9rem;font-weight:500;color:var(--color-muted);transition:all var(--transition-fast);white-space:nowrap}
        .nav-links a:hover{color:var(--color-deep);background:var(--color-surface-alt)}
        .nav-links a.active{color:var(--color-primary);background:#eff6ff;font-weight:600}
        .nav-cta-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;background:var(--color-primary);color:#fff!important;border-radius:var(--radius-btn);font-weight:600;font-size:0.85rem;transition:all var(--transition-normal);white-space:nowrap}
        .nav-cta-btn:hover{background:var(--color-primary-dark);box-shadow:0 4px 14px rgba(37,99,235,0.3);transform:translateY(-1px)}
        .mobile-menu-toggle{display:none;font-size:1.3rem;color:var(--color-deep-alt);padding:8px;border-radius:6px;transition:background var(--transition-fast)}
        .mobile-menu-toggle:hover{background:var(--color-surface-alt)}
        @media(max-width:768px){
            .nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:var(--color-white);flex-direction:column;padding:16px;gap:4px;border-bottom:2px solid var(--color-border-soft);box-shadow:var(--shadow-soft);z-index:999}
            .nav-links.open{display:flex}
            .nav-links a{width:100%;padding:12px 16px;border-radius:8px}
            .mobile-menu-toggle{display:block}
            .nav-cta-btn{display:none}
            .nav-cta-mobile{display:block!important;width:100%;text-align:center;margin-top:8px;padding:12px;background:var(--color-primary);color:#fff;border-radius:var(--radius-btn);font-weight:600}
        }
        @media(min-width:769px){.nav-cta-mobile{display:none!important}}

        /* Hero */
        .hero{position:relative;background:linear-gradient(135deg,var(--color-deep) 0%,#1a2740 40%,#162240 100%);color:#fff;overflow:hidden;min-height:520px;display:flex;align-items:center}
        .hero-bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.png');background-size:cover;background-position:center;opacity:0.18;z-index:0}
        .hero-overlay{position:absolute;inset:0;background:radial-gradient(ellipse at 30% 50%,rgba(37,99,235,0.2) 0%,transparent 60%),radial-gradient(ellipse at 70% 30%,rgba(6,182,212,0.15) 0%,transparent 50%);z-index:1}
        .hero .container{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;padding-top:50px;padding-bottom:50px}
        .hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,0.1);border:1px solid rgba(255,255,255,0.2);padding:6px 14px;border-radius:var(--radius-tag);font-size:0.8rem;color:#cbd5e1;margin-bottom:16px;backdrop-filter:blur(4px)}
        .hero-badge .badge-dot{width:6px;height:6px;border-radius:50%;background:#10b981}
        .hero h1{font-size:2.6rem;font-weight:800;line-height:1.2;letter-spacing:-0.03em;margin-bottom:16px}
        .hero h1 span{background:linear-gradient(135deg,#60a5fa,#22d3ee);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
        .hero p{font-size:1.05rem;color:#94a3b8;max-width:440px;margin-bottom:28px;line-height:1.7}
        .hero-buttons{display:flex;flex-wrap:wrap;gap:12px}
        .btn-primary{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;background:var(--color-primary);color:#fff;border-radius:var(--radius-btn);font-weight:600;font-size:0.95rem;transition:all var(--transition-normal);box-shadow:0 4px 16px rgba(37,99,235,0.35)}
        .btn-primary:hover{background:var(--color-primary-dark);box-shadow:0 6px 22px rgba(37,99,235,0.45);transform:translateY(-2px)}
        .btn-outline{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;background:rgba(255,255,255,0.06);color:#fff;border:1px solid rgba(255,255,255,0.25);border-radius:var(--radius-btn);font-weight:600;font-size:0.95rem;transition:all var(--transition-normal);backdrop-filter:blur(4px)}
        .btn-outline:hover{background:rgba(255,255,255,0.12);border-color:rgba(255,255,255,0.45);transform:translateY(-2px)}
        .hero-stats{display:flex;gap:28px;margin-top:10px;flex-wrap:wrap}
        .hero-stat{text-align:left}
        .hero-stat .stat-num{font-size:2rem;font-weight:800;color:#fff;letter-spacing:-0.02em}
        .hero-stat .stat-label{font-size:0.8rem;color:#94a3b8}
        @media(max-width:768px){
            .hero .container{grid-template-columns:1fr;gap:30px;text-align:center;padding-top:36px;padding-bottom:36px}
            .hero h1{font-size:1.9rem}
            .hero p{margin-left:auto;margin-right:auto}
            .hero-buttons{justify-content:center}
            .hero-stats{justify-content:center}
            .hero-stat{text-align:center}
            .hero{min-height:auto}
        }
        @media(max-width:520px){
            .hero h1{font-size:1.55rem}
            .hero p{font-size:0.9rem}
        }

        /* Section common */
        .section{padding:60px 0}
        .section-header{text-align:center;margin-bottom:44px}
        .section-header .section-label{display:inline-block;font-size:0.78rem;font-weight:700;text-transform:uppercase;letter-spacing:0.06em;color:var(--color-primary);background:#eff6ff;padding:5px 14px;border-radius:var(--radius-tag);margin-bottom:10px}
        .section-header h2{font-size:1.8rem;font-weight:700;color:var(--color-deep);letter-spacing:-0.02em;margin-bottom:8px}
        .section-header p{color:var(--color-muted);font-size:0.95rem;max-width:560px;margin:0 auto}
        @media(max-width:768px){.section{padding:40px 0}.section-header h2{font-size:1.45rem}}

        /* Feature grid */
        .feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
        .feature-card{background:var(--color-white);border-radius:var(--radius-card);padding:26px 22px;box-shadow:var(--shadow-card);border:1px solid var(--color-border-soft);transition:all var(--transition-normal);position:relative;overflow:hidden}
        .feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--color-primary),var(--color-accent));opacity:0;transition:opacity var(--transition-normal)}
        .feature-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-4px);border-color:#cbd5e1}
        .feature-card:hover::before{opacity:1}
        .feature-card .fc-icon{width:46px;height:46px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;margin-bottom:14px;background:var(--color-surface-alt);color:var(--color-primary);transition:all var(--transition-normal)}
        .feature-card:hover .fc-icon{background:var(--color-primary);color:#fff}
        .feature-card h3{font-size:1rem;font-weight:700;color:var(--color-deep);margin-bottom:6px}
        .feature-card p{font-size:0.85rem;color:var(--color-muted);line-height:1.55}
        @media(max-width:1024px){.feature-grid{grid-template-columns:repeat(2,1fr)}}
        @media(max-width:520px){.feature-grid{grid-template-columns:1fr}}

        /* Stats bar */
        .stats-bar{background:var(--color-white);border-top:1px solid var(--color-border-soft);border-bottom:1px solid var(--color-border-soft);padding:36px 0}
        .stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
        .stat-item .stat-value{font-size:2.2rem;font-weight:800;color:var(--color-deep);letter-spacing:-0.03em}
        .stat-item .stat-value span{color:var(--color-primary)}
        .stat-item .stat-desc{font-size:0.82rem;color:var(--color-muted);margin-top:4px}
        @media(max-width:768px){.stats-grid{grid-template-columns:repeat(2,1fr);gap:24px}.stat-item .stat-value{font-size:1.7rem}}
        @media(max-width:520px){.stats-grid{grid-template-columns:1fr 1fr}}

        /* Category entry cards */
        .category-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
        .cat-card{background:var(--color-white);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card);border:1px solid var(--color-border-soft);transition:all var(--transition-normal);display:block}
        .cat-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-4px)}
        .cat-card .cat-img-wrap{height:180px;overflow:hidden;position:relative}
        .cat-card .cat-img-wrap img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-normal)}
        .cat-card:hover .cat-img-wrap img{transform:scale(1.05)}
        .cat-card .cat-img-overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(15,23,42,0.7) 0%,transparent 50%)}
        .cat-card .cat-body{padding:18px 20px}
        .cat-card .cat-tag{display:inline-block;font-size:0.72rem;font-weight:700;color:var(--color-primary);background:#eff6ff;padding:4px 10px;border-radius:var(--radius-tag);margin-bottom:8px}
        .cat-card h3{font-size:1.05rem;font-weight:700;color:var(--color-deep);margin-bottom:4px}
        .cat-card p{font-size:0.82rem;color:var(--color-muted);line-height:1.5}
        @media(max-width:768px){.category-cards{grid-template-columns:1fr 1fr}}
        @media(max-width:520px){.category-cards{grid-template-columns:1fr}}

        /* News list */
        .news-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
        .news-item{background:var(--color-white);border-radius:var(--radius-card);padding:18px 20px;box-shadow:var(--shadow-card);border:1px solid var(--color-border-soft);transition:all var(--transition-normal);display:flex;gap:14px;align-items:flex-start}
        .news-item:hover{box-shadow:var(--shadow-card-hover);border-color:#cbd5e1;transform:translateY(-2px)}
        .news-item .news-thumb{width:80px;height:60px;border-radius:8px;object-fit:cover;flex-shrink:0;background:var(--color-surface-alt)}
        .news-item .news-info{flex:1;min-width:0}
        .news-item .news-meta{font-size:0.72rem;color:var(--color-muted);margin-bottom:4px;display:flex;gap:8px}
        .news-item .news-meta .news-cat{color:var(--color-primary);font-weight:600}
        .news-item h4{font-size:0.92rem;font-weight:600;color:var(--color-deep);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .news-item h4 a{color:inherit;transition:color var(--transition-fast)}
        .news-item h4 a:hover{color:var(--color-primary)}
        .news-empty{padding:40px;text-align:center;color:var(--color-muted);font-size:0.9rem;grid-column:1/-1;background:var(--color-white);border-radius:var(--radius-card);border:1px dashed var(--color-border-soft)}
        @media(max-width:768px){.news-list{grid-template-columns:1fr}}
        @media(max-width:520px){.news-item{flex-direction:column}.news-item .news-thumb{width:100%;height:120px}}

        /* Steps */
        .steps-container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
        .step-card{background:var(--color-white);border-radius:var(--radius-card);padding:24px 20px;text-align:center;box-shadow:var(--shadow-card);border:1px solid var(--color-border-soft);position:relative;transition:all var(--transition-normal)}
        .step-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-3px)}
        .step-number{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));color:#fff;font-weight:800;font-size:1.1rem;display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
        .step-card h4{font-weight:700;font-size:1rem;color:var(--color-deep);margin-bottom:6px}
        .step-card p{font-size:0.82rem;color:var(--color-muted);line-height:1.5}
        @media(max-width:1024px){.steps-container{grid-template-columns:repeat(2,1fr)}}
        @media(max-width:520px){.steps-container{grid-template-columns:1fr}}

        /* FAQ */
        .faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
        .faq-item{background:var(--color-white);border-radius:var(--radius-card);border:1px solid var(--color-border-soft);overflow:hidden;transition:all var(--transition-normal)}
        .faq-item:hover{border-color:#cbd5e1}
        .faq-q{padding:16px 20px;font-weight:600;font-size:0.95rem;color:var(--color-deep);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;user-select:none}
        .faq-q .faq-icon{font-size:0.85rem;color:var(--color-muted);transition:transform var(--transition-normal);flex-shrink:0}
        .faq-item.open .faq-q .faq-icon{transform:rotate(180deg);color:var(--color-primary)}
        .faq-a{padding:0 20px 16px;font-size:0.85rem;color:var(--color-muted);line-height:1.6;display:none}
        .faq-item.open .faq-a{display:block}

        /* CTA */
        .cta-section{background:linear-gradient(135deg,var(--color-deep) 0%,#1a3050 100%);color:#fff;text-align:center;padding:60px 0;position:relative;overflow:hidden}
        .cta-section::before{content:'';position:absolute;inset:0;background-image:url('/assets/images/backpic/back-2.png');background-size:cover;background-position:center;opacity:0.12;z-index:0}
        .cta-section .container{position:relative;z-index:1}
        .cta-section h2{font-size:1.7rem;font-weight:700;margin-bottom:10px}
        .cta-section p{color:#94a3b8;max-width:500px;margin:0 auto 24px;font-size:0.95rem}
        .cta-section .btn-primary{background:#fff;color:var(--color-primary);box-shadow:0 4px 16px rgba(255,255,255,0.2)}
        .cta-section .btn-primary:hover{background:#f1f5f9;box-shadow:0 6px 22px rgba(255,255,255,0.3)}

        /* Footer */
        .site-footer{background:var(--color-deep);color:#94a3b8;padding:40px 0 24px}
        .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
        .footer-brand .footer-logo{font-size:1.1rem;font-weight:700;color:#fff;margin-bottom:8px;display:block}
        .footer-brand p{font-size:0.82rem;line-height:1.6}
        .footer-col h5{font-size:0.85rem;font-weight:700;color:#e2e8f0;margin-bottom:12px;text-transform:uppercase;letter-spacing:0.04em}
        .footer-col ul{display:flex;flex-direction:column;gap:7px}
        .footer-col ul li a{font-size:0.82rem;color:#94a3b8;transition:color var(--transition-fast)}
        .footer-col ul li a:hover{color:#fff}
        .footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding-top:18px;text-align:center;font-size:0.78rem;color:#64748b}
        @media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr;gap:24px}}
        @media(max-width:520px){.footer-grid{grid-template-columns:1fr}}

        /* Section bg alt */
        .bg-alt{background:var(--color-white)}
        .bg-surface{background:var(--color-surface)}

/* roulang page: article */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-surface: #eff6ff;
            --secondary: #0f172a;
            --secondary-light: #1e293b;
            --accent: #3b82f6;
            --accent-warm: #f59e0b;
            --bg: #f1f5f9;
            --bg-alt: #f8fafc;
            --surface: #ffffff;
            --surface-hover: #f8fafc;
            --text: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-inverse: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 16px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1), 0 8px 20px rgba(0, 0, 0, 0.05);
            --transition-fast: 150ms ease;
            --transition: 250ms ease;
            --transition-slow: 400ms ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', 'Monaco', monospace;
            --max-width: 1200px;
            --max-width-article: 780px;
            --nav-height: 68px;
            --topbar-height: 36px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
        }

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

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .container-narrow {
            max-width: var(--max-width-article);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ========== TOP BAR ========== */
        .top-bar {
            background: var(--secondary);
            color: #cbd5e1;
            font-size: 13px;
            height: var(--topbar-height);
            line-height: var(--topbar-height);
            display: flex;
            align-items: center;
        }
        .top-bar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .top-bar a {
            color: #e2e8f0;
            font-weight: 500;
            transition: color var(--transition-fast);
        }
        .top-bar a:hover {
            color: #ffffff;
        }
        .top-bar .top-actions {
            display: flex;
            gap: 20px;
            align-items: center;
        }
        .top-bar .top-dot {
            display: inline-block;
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: #22c55e;
            margin-right: 6px;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.5);
            }
            50% {
                box-shadow: 0 0 0 6px rgba(34, 197, 94, 0);
            }
        }

        /* ========== MAIN NAV ========== */
        .main-nav {
            background: var(--surface);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-xs);
            transition: box-shadow var(--transition);
        }
        .main-nav.scrolled {
            box-shadow: var(--shadow);
        }
        .main-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 18px;
            color: var(--secondary);
            letter-spacing: -0.3px;
            white-space: nowrap;
            transition: opacity var(--transition-fast);
        }
        .nav-logo:hover {
            opacity: 0.85;
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #ffffff;
            font-weight: 800;
            font-size: 19px;
            letter-spacing: 0;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-surface);
        }
        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-surface);
            font-weight: 600;
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            background: var(--primary);
            color: #ffffff !important;
            transition: all var(--transition-fast);
            white-space: nowrap;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }
        .nav-cta-btn:hover {
            background: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
        }
        .nav-cta-mobile {
            display: none !important;
        }
        .mobile-menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            font-size: 20px;
            color: var(--text);
            transition: background var(--transition-fast);
            flex-shrink: 0;
        }
        .mobile-menu-toggle:hover {
            background: var(--bg);
        }

        /* ========== ARTICLE BANNER ========== */
        .article-banner {
            position: relative;
            min-height: 280px;
            display: flex;
            align-items: center;
            background: var(--secondary-light);
            background-image: url('<?php echo $bannerImage; ?>');
            background-size: cover;
            background-position: center;
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 41, 59, 0.7) 100%);
            z-index: 1;
        }
        .article-banner .container-narrow {
            position: relative;
            z-index: 2;
            padding-top: 48px;
            padding-bottom: 48px;
            text-align: center;
        }
        .article-banner .banner-category {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.15);
            color: #e2e8f0;
            backdrop-filter: blur(8px);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .article-banner h1 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #ffffff;
            line-height: 1.3;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .article-banner .banner-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 14px;
            color: #cbd5e1;
        }
        .article-banner .banner-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-banner .banner-meta i {
            font-size: 13px;
            opacity: 0.7;
        }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-wrap {
            background: var(--surface);
            border-bottom: 1px solid var(--border-light);
            padding: 14px 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .separator {
            color: var(--border);
            font-size: 11px;
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }

        /* ========== ARTICLE LAYOUT ========== */
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
            align-items: start;
            padding-top: 40px;
            padding-bottom: 60px;
        }
        .article-layout .article-main {
            min-width: 0;
        }
        .article-layout .article-sidebar {
            position: sticky;
            top: calc(var(--nav-height) + 24px);
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        /* ========== ARTICLE CONTENT ========== */
        .article-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-sm);
        }
        .article-featured-image {
            border-radius: var(--radius);
            overflow: hidden;
            margin-bottom: 28px;
            box-shadow: var(--shadow);
        }
        .article-featured-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .article-body {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--secondary);
            margin-top: 36px;
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-light);
            letter-spacing: -0.3px;
        }
        .article-body h3 {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--text);
            margin-top: 28px;
            margin-bottom: 12px;
        }
        .article-body p {
            margin-bottom: 18px;
            color: var(--text-secondary);
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 18px;
            padding-left: 24px;
            color: var(--text-secondary);
        }
        .article-body ul {
            list-style: disc;
        }
        .article-body ol {
            list-style: decimal;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-surface);
            padding: 18px 24px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 24px 0;
            color: var(--text);
            font-style: italic;
        }
        .article-body code {
            background: var(--bg);
            padding: 2px 8px;
            border-radius: var(--radius-sm);
            font-family: var(--font-mono);
            font-size: 0.9em;
            color: var(--primary-dark);
        }
        .article-body pre {
            background: var(--secondary);
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius);
            overflow-x: auto;
            margin: 20px 0;
            font-size: 14px;
            line-height: 1.6;
        }
        .article-body pre code {
            background: none;
            padding: 0;
            color: inherit;
            font-size: inherit;
        }
        .article-body img {
            border-radius: var(--radius);
            margin: 20px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body strong {
            color: var(--text);
            font-weight: 600;
        }
        .article-body a {
            color: var(--primary);
            font-weight: 500;
            text-decoration: underline;
            text-underline-offset: 3px;
            transition: color var(--transition-fast);
        }
        .article-body a:hover {
            color: var(--primary-dark);
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 14px;
        }
        .article-body table th,
        .article-body table td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-body table th {
            background: var(--bg-alt);
            font-weight: 600;
            color: var(--text);
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid var(--border-light);
        }
        .article-tags .tag {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            background: var(--primary-surface);
            color: var(--primary);
            transition: all var(--transition-fast);
        }
        .article-tags .tag:hover {
            background: var(--primary);
            color: #ffffff;
        }

        /* ========== NOT FOUND ========== */
        .not-found-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        .not-found-card .nf-icon {
            font-size: 56px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .not-found-card h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 10px;
        }
        .not-found-card p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            background: var(--primary);
            color: #ffffff;
            transition: all var(--transition-fast);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }
        .btn-back:hover {
            background: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
        }

        /* ========== SIDEBAR ========== */
        .sidebar-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h5 {
            font-size: 15px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-light);
            letter-spacing: -0.2px;
        }
        .sidebar-post-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .sidebar-post-item {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .sidebar-post-item:hover {
            background: var(--bg-alt);
        }
        .sidebar-post-thumb {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg);
        }
        .sidebar-post-info {
            flex: 1;
            min-width: 0;
        }
        .sidebar-post-info a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color var(--transition-fast);
        }
        .sidebar-post-info a:hover {
            color: var(--primary);
        }
        .sidebar-post-info .sp-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }
        .sidebar-cta-mini {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #ffffff;
            border-radius: var(--radius-lg);
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow);
        }
        .sidebar-cta-mini h5 {
            color: #ffffff;
            border-bottom-color: rgba(255, 255, 255, 0.25);
        }
        .sidebar-cta-mini p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 16px;
            line-height: 1.5;
        }
        .sidebar-cta-mini .btn-sidebar-cta {
            display: inline-block;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 14px;
            background: #ffffff;
            color: var(--primary);
            transition: all var(--transition-fast);
        }
        .sidebar-cta-mini .btn-sidebar-cta:hover {
            background: #f1f5f9;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: var(--secondary);
            padding: 60px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(59, 130, 246, 0.2);
            filter: blur(80px);
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -60px;
            width: 240px;
            height: 240px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.15);
            filter: blur(60px);
        }
        .cta-section .container-narrow {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 14px;
            letter-spacing: -0.3px;
        }
        .cta-section p {
            color: #cbd5e1;
            font-size: 16px;
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-cta-lg {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 16px;
            background: #ffffff;
            color: var(--primary);
            transition: all var(--transition-fast);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        }
        .btn-cta-lg:hover {
            background: #f1f5f9;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 56px 0 28px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand .footer-logo {
            font-size: 18px;
            font-weight: 700;
            color: #ffffff;
            display: block;
            margin-bottom: 10px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.6;
            color: #94a3b8;
        }
        .footer-col h5 {
            font-size: 14px;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 14px;
            letter-spacing: 0.2px;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col a {
            font-size: 14px;
            color: #94a3b8;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 13px;
            color: #64748b;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-layout .article-sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .article-sidebar .sidebar-card:last-child {
                grid-column: 1 / -1;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .top-bar .top-actions {
                display: none;
            }
            .top-bar .container {
                justify-content: center;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--surface);
                flex-direction: column;
                padding: 12px 16px;
                gap: 2px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                z-index: 99;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
            .nav-cta-mobile {
                display: inline-flex !important;
                width: 100%;
                justify-content: center;
                margin-top: 8px;
                padding: 12px;
                border-radius: var(--radius-sm);
                background: var(--primary);
                color: #ffffff !important;
                font-weight: 600;
            }
            .nav-cta-btn {
                display: none;
            }
            .mobile-menu-toggle {
                display: flex;
            }
            .article-banner {
                min-height: 200px;
            }
            .article-banner h1 {
                font-size: 1.5rem;
            }
            .article-card {
                padding: 24px 18px;
            }
            .article-layout .article-sidebar {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
        }

        @media (max-width: 520px) {
            .container,
            .container-narrow {
                padding-left: 14px;
                padding-right: 14px;
            }
            .article-banner h1 {
                font-size: 1.3rem;
            }
            .article-banner .banner-meta {
                gap: 10px;
                font-size: 12px;
            }
            .article-card {
                padding: 18px 14px;
                border-radius: var(--radius);
            }
            .article-body {
                font-size: 15px;
            }
            .article-body h2 {
                font-size: 1.25rem;
            }
            .breadcrumb {
                font-size: 12px;
            }
            .sidebar-post-thumb {
                width: 48px;
                height: 48px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #1e40af;
            --primary-700: #1e3a8a;
            --primary-600: #1d4ed8;
            --primary-500: #2563eb;
            --primary-400: #3b82f6;
            --primary-300: #60a5fa;
            --primary-100: #dbeafe;
            --primary-50: #eff6ff;
            --accent: #0ea5e9;
            --accent-600: #0284c7;
            --accent-400: #38bdf8;
            --accent-100: #e0f2fe;
            --success: #10b981;
            --success-100: #d1fae5;
            --warning: #f59e0b;
            --warning-100: #fef3c7;
            --danger: #ef4444;
            --bg: #f1f5f9;
            --bg-alt: #f8fafc;
            --surface: #ffffff;
            --surface-hover: #f8fafc;
            --text: #1e293b;
            --text-800: #1e293b;
            --text-700: #334155;
            --text-600: #475569;
            --text-secondary: #64748b;
            --text-400: #94a3b8;
            --text-300: #cbd5e1;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-xs: 6px;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-2xl: 24px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.12), 0 8px 20px rgba(0,0,0,0.06);
            --shadow-card: 0 1px 4px rgba(0,0,0,0.05), 0 4px 16px rgba(0,0,0,0.04);
            --shadow-card-hover: 0 4px 16px rgba(0,0,0,0.10), 0 8px 32px rgba(0,0,0,0.06);
            --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
            --max-width: 1280px;
            --nav-height: 72px;
            --topbar-height: 36px;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
            font-size: inherit;
        }

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

        ul, ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== TOP BAR ========== */
        .top-bar {
            background: var(--primary-700);
            color: #ffffff;
            font-size: 13px;
            height: var(--topbar-height);
            line-height: var(--topbar-height);
            overflow: hidden;
        }
        .top-bar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .top-bar-left {
            display: flex;
            align-items: center;
            gap: 18px;
            opacity: 0.9;
        }
        .top-bar-left i {
            font-size: 11px;
            margin-right: 4px;
        }
        .top-bar-right {
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .top-bar-right a {
            color: #ffffff;
            opacity: 0.85;
            transition: opacity var(--transition-fast);
            font-size: 12px;
        }
        .top-bar-right a:hover {
            opacity: 1;
        }
        .top-bar-badge {
            background: var(--accent);
            color: #fff;
            font-size: 11px;
            padding: 2px 10px;
            border-radius: 20px;
            font-weight: 600;
            line-height: 1.5;
        }

        /* ========== HEADER / MAIN NAV ========== */
        .main-nav {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-xs);
            height: var(--nav-height);
        }
        .main-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-800);
            text-decoration: none;
            white-space: nowrap;
            letter-spacing: -0.02em;
        }
        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary-500), var(--accent));
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 800;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-600);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--primary-500);
            background: var(--primary-50);
        }
        .nav-links a.active {
            color: var(--primary-600);
            background: var(--primary-50);
            font-weight: 600;
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
            color: #ffffff !important;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-base);
            white-space: nowrap;
            box-shadow: 0 2px 8px rgba(30,64,175,0.25);
        }
        .nav-cta-btn:hover {
            background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
            box-shadow: 0 4px 16px rgba(30,64,175,0.35);
            transform: translateY(-1px);
        }
        .nav-cta-mobile {
            display: none !important;
        }
        .mobile-menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            color: var(--text-700);
            font-size: 1.3rem;
            transition: background var(--transition-fast);
        }
        .mobile-menu-toggle:hover {
            background: var(--bg);
        }

        /* ========== PAGE BANNER ========== */
        .page-banner {
            position: relative;
            background: linear-gradient(160deg, #0f172a 0%, #1e3a5f 30%, #1a3a6b 60%, #0f172a 100%);
            padding: 60px 0 64px;
            overflow: hidden;
            color: #ffffff;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.18;
            mix-blend-mode: overlay;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, var(--bg), transparent);
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .banner-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .banner-breadcrumb a {
            color: rgba(255,255,255,0.8);
            transition: color var(--transition-fast);
        }
        .banner-breadcrumb a:hover {
            color: #ffffff;
        }
        .banner-breadcrumb .separator {
            font-size: 0.7rem;
            opacity: 0.5;
        }
        .banner-breadcrumb .current {
            color: #ffffff;
            font-weight: 500;
        }
        .page-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            margin-bottom: 12px;
            line-height: 1.2;
        }
        .page-banner .banner-subtitle {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.75);
            max-width: 600px;
            line-height: 1.6;
        }
        .banner-stats-row {
            display: flex;
            gap: 32px;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .banner-stat {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .banner-stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-400);
        }
        .banner-stat-label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.65);
        }

        /* ========== MAIN CONTENT ========== */
        .main-content {
            flex: 1;
            padding: 0 0 60px;
        }

        /* Section spacing */
        .section {
            padding: 48px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 36px;
        }
        .section-header h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-800);
            letter-spacing: -0.02em;
            margin-bottom: 8px;
        }
        .section-header .section-desc {
            color: var(--text-secondary);
            font-size: 0.95rem;
            max-width: 520px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* ========== FEATURE CATEGORY CARDS ========== */
        .feature-cat-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .feature-cat-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: 14px;
            cursor: default;
            position: relative;
            overflow: hidden;
        }
        .feature-cat-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 40px;
            background: var(--primary-400);
            border-radius: 0 4px 4px 0;
            transition: height var(--transition-base);
        }
        .feature-cat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: var(--primary-100);
        }
        .feature-cat-card:hover::before {
            height: 60px;
            background: var(--primary-500);
        }
        .cat-card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            flex-shrink: 0;
        }
        .cat-card-icon.blue {
            background: var(--primary-50);
            color: var(--primary-500);
        }
        .cat-card-icon.teal {
            background: #ccfbf1;
            color: #0d9488;
        }
        .cat-card-icon.amber {
            background: var(--warning-100);
            color: #d97706;
        }
        .cat-card-icon.indigo {
            background: #e0e7ff;
            color: #4f46e5;
        }
        .cat-card-icon.rose {
            background: #ffe4e6;
            color: #e11d48;
        }
        .cat-card-icon.emerald {
            background: var(--success-100);
            color: #059669;
        }
        .cat-card-info h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-800);
            margin-bottom: 4px;
        }
        .cat-card-info p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }
        .cat-card-count {
            font-size: 0.8rem;
            color: var(--text-400);
            margin-top: auto;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .cat-card-count span {
            font-weight: 700;
            color: var(--primary-500);
        }

        /* ========== ARTICLE LIST ========== */
        .article-list-section {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            padding: 40px;
            margin-top: 8px;
        }
        .article-list-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 28px;
            flex-wrap: wrap;
            gap: 12px;
        }
        .article-list-header h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-800);
        }
        .article-filter-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .filter-tag {
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 500;
            color: var(--text-600);
            background: var(--bg);
            border: 1px solid transparent;
            transition: all var(--transition-fast);
            cursor: pointer;
            white-space: nowrap;
        }
        .filter-tag:hover {
            color: var(--primary-500);
            border-color: var(--primary-200);
            background: var(--primary-50);
        }
        .filter-tag.active {
            background: var(--primary-500);
            color: #fff;
        }
        .article-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .article-card {
            background: var(--bg-alt);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border-light);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-100);
            transform: translateY(-2px);
        }
        .article-card-image {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #e2e8f0;
        }
        .article-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .article-card:hover .article-card-image img {
            transform: scale(1.04);
        }
        .article-card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--primary-500);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            z-index: 1;
            letter-spacing: 0.02em;
        }
        .article-card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .article-card-body h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-800);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card-body h4 a {
            color: inherit;
            transition: color var(--transition-fast);
        }
        .article-card-body h4 a:hover {
            color: var(--primary-500);
        }
        .article-card-excerpt {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.55;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 0.8rem;
            color: var(--text-400);
            margin-top: auto;
            padding-top: 8px;
        }
        .article-card-meta i {
            margin-right: 3px;
        }

        /* ========== WORKFLOW STEPS ========== */
        .workflow-section {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            padding: 40px;
        }
        .workflow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .workflow-step {
            text-align: center;
            padding: 24px 16px;
            position: relative;
        }
        .workflow-step:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 36px;
            right: -14px;
            width: 28px;
            height: 2px;
            background: var(--border);
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-500), var(--accent));
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            margin-bottom: 14px;
            box-shadow: 0 4px 14px rgba(30,64,175,0.25);
        }
        .workflow-step h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-800);
            margin-bottom: 6px;
        }
        .workflow-step p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ========== DATA HIGHLIGHTS ========== */
        .data-highlights {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .data-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            text-align: center;
            transition: all var(--transition-base);
        }
        .data-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .data-card-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            margin-bottom: 12px;
            background: var(--primary-50);
            color: var(--primary-500);
        }
        .data-card-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-800);
            letter-spacing: -0.02em;
        }
        .data-card-label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-xs);
        }
        .faq-item:hover {
            border-color: var(--primary-100);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--text-800);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--primary-500);
        }
        .faq-question i {
            font-size: 0.8rem;
            color: var(--text-400);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary-500);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 22px 18px;
            font-size: 0.9rem;
            color: var(--text-600);
            line-height: 1.7;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(150deg, #0f172a 0%, #1a3a6b 50%, #0f172a 100%);
            border-radius: var(--radius-2xl);
            padding: 48px 40px;
            text-align: center;
            color: #ffffff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .cta-section .container-cta {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 10px;
            letter-spacing: -0.02em;
        }
        .cta-section p {
            font-size: 1rem;
            color: rgba(255,255,255,0.7);
            margin-bottom: 24px;
            max-width: 480px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-btn-large {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            background: #ffffff;
            color: var(--primary-700);
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition-base);
            box-shadow: 0 6px 20px rgba(0,0,0,0.25);
        }
        .cta-btn-large:hover {
            background: #f0f4ff;
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.35);
        }
        .cta-btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 34px;
            background: transparent;
            color: #ffffff;
            border: 2px solid rgba(255,255,255,0.35);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-base);
            margin-left: 14px;
        }
        .cta-btn-outline:hover {
            border-color: #ffffff;
            background: rgba(255,255,255,0.08);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 32px;
        }
        .footer-brand .footer-logo {
            display: inline-block;
            font-weight: 700;
            font-size: 1.2rem;
            color: #ffffff;
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }
        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.6;
            color: #94a3b8;
            max-width: 280px;
        }
        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: #94a3b8;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 18px;
            text-align: center;
            font-size: 0.82rem;
            color: #64748b;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .feature-cat-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-grid {
                grid-template-columns: 1fr 1fr;
            }
            .workflow-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .workflow-step:not(:last-child)::after {
                display: none;
            }
            .workflow-step:nth-child(odd)::after {
                display: block;
                right: -10px;
                width: 20px;
            }
            .data-highlights {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .page-banner h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            .top-bar {
                display: none;
            }
            .main-nav {
                height: 60px;
            }
            .nav-links {
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                background: var(--surface);
                flex-direction: column;
                padding: 16px 20px;
                gap: 4px;
                border-bottom: 2px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                transition: transform var(--transition-base);
                z-index: 999;
            }
            .nav-links.open {
                transform: translateY(0);
            }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav-cta-btn {
                display: none !important;
            }
            .nav-cta-mobile {
                display: flex !important;
                width: 100%;
                justify-content: center;
                padding: 12px;
                background: var(--primary-500);
                color: #fff !important;
                border-radius: var(--radius-sm);
                font-weight: 600;
                margin-top: 6px;
            }
            .mobile-menu-toggle {
                display: flex;
            }
            .feature-cat-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .article-grid {
                grid-template-columns: 1fr;
            }
            .article-list-section {
                padding: 20px 16px;
            }
            .workflow-steps {
                grid-template-columns: 1fr;
            }
            .workflow-step::after {
                display: none !important;
            }
            .workflow-section {
                padding: 24px 16px;
            }
            .data-highlights {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .page-banner {
                padding: 36px 0 40px;
            }
            .page-banner h1 {
                font-size: 1.6rem;
            }
            .banner-stats-row {
                gap: 16px;
            }
            .banner-stat-num {
                font-size: 1.3rem;
            }
            .section {
                padding: 32px 0;
            }
            .section-header h2 {
                font-size: 1.4rem;
            }
            .cta-section {
                padding: 32px 20px;
                border-radius: var(--radius-lg);
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .cta-btn-outline {
                display: flex;
                margin-left: 0;
                margin-top: 12px;
                justify-content: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .nav-logo {
                font-size: 1rem;
                gap: 6px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 1rem;
            }
            .page-banner h1 {
                font-size: 1.35rem;
            }
            .page-banner .banner-subtitle {
                font-size: 0.9rem;
            }
            .banner-stats-row {
                gap: 12px;
                flex-direction: column;
            }
            .data-highlights {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .data-card {
                padding: 16px 12px;
            }
            .data-card-value {
                font-size: 1.5rem;
            }
            .article-list-section {
                padding: 16px 12px;
                border-radius: var(--radius);
            }
            .article-filter-tags {
                gap: 6px;
            }
            .filter-tag {
                padding: 5px 10px;
                font-size: 0.75rem;
            }
            .cta-btn-large {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
        }