/* roulang page: index */
:root{--primary:#0f172a;--primary-light:#1e293b;--primary-dark:#020617;--accent:#f59e0b;--accent-hover:#d97706;--bg:#f8fafc;--card:#ffffff;--text:#1e293b;--text-muted:#64748b;--border:#e2e8f0;--radius:16px;--radius-sm:10px;--shadow:0 4px 24px rgba(15,23,42,0.08);--shadow-hover:0 10px 40px rgba(15,23,42,0.12);--transition:all .25s ease}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit;transition:var(--transition)}
ul,ol{list-style:none}
button,input,select{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.section-tag{display:inline-flex;align-items:center;gap:6px;background:rgba(245,158,11,.1);color:#b45309;font-size:13px;font-weight:600;padding:4px 14px;border-radius:999px;border:1px solid rgba(245,158,11,.25)}
.section-title{font-size:32px;font-weight:800;color:var(--primary);line-height:1.3;margin-bottom:12px}
.section-desc{color:var(--text-muted);max-width:680px;font-size:15px;margin-bottom:40px}
.section-head{text-align:center;margin-bottom:48px}
.section-head .section-desc{margin-left:auto;margin-right:auto}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:12px 28px;border-radius:999px;cursor:pointer;transition:var(--transition);border:2px solid transparent;white-space:nowrap}
.btn:focus-visible{outline:3px solid rgba(245,158,11,.5);outline-offset:2px}
.btn-accent{background:var(--accent);color:#0f172a;box-shadow:0 4px 16px rgba(245,158,11,.35)}
.btn-accent:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px);box-shadow:0 6px 20px rgba(245,158,11,.4)}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-light);transform:translateY(-2px);box-shadow:0 6px 20px rgba(15,23,42,.2)}
.btn-outline{border-color:#cbd5e1;color:var(--primary);background:transparent}
.btn-outline:hover{border-color:var(--accent);color:#b45309;background:rgba(245,158,11,.05);transform:translateY(-2px)}
.btn-white{background:#fff;color:var(--primary)}
.btn-white:hover{background:#f1f5f9;transform:translateY(-2px)}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:12px}
.logo-icon{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,#0f172a,#1e3a8a);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;color:var(--accent);box-shadow:0 4px 12px rgba(15,23,42,.2)}
.logo-text{font-size:20px;font-weight:800;color:var(--primary);letter-spacing:-.5px}
.desktop-nav{display:flex;gap:8px}
.nav-link{padding:8px 18px;border-radius:999px;font-size:14px;font-weight:500;color:#475569}
.nav-link:hover{color:var(--primary);background:#f1f5f9}
.nav-link.active{background:var(--primary);color:#fff}
.header-cta{display:inline-flex;padding:10px 24px}

/* Mobile bottom nav */
.mobile-bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:100;background:#fff;border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:6px 0 calc(8px + env(safe-area-inset-bottom));box-shadow:0 -4px 24px rgba(15,23,42,.06)}
.m-nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:11px;font-weight:500;color:#94a3b8;padding:6px 12px;border-radius:12px}
.m-nav-item i{font-size:19px}
.m-nav-item:hover,.m-nav-item.active{color:var(--accent)}
.m-nav-item.active{background:rgba(245,158,11,.08)}
@media(min-width:769px){.mobile-bottom-nav{display:none}}

/* Hero */
.hero{position:relative;min-height:620px;display:flex;align-items:center;background-size:cover;background-position:center;color:#fff}
.hero::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(2,6,23,.92) 0%,rgba(15,23,42,.7) 55%,rgba(245,158,11,.35) 100%)}
.hero-content{position:relative;z-index:2;max-width:760px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(245,158,11,.15);border:1px solid rgba(245,158,11,.35);color:#fbbf24;font-size:13px;font-weight:600;padding:6px 18px;border-radius:999px;margin-bottom:28px;backdrop-filter:blur(6px)}
.hero h1{font-size:52px;font-weight:900;line-height:1.15;margin-bottom:18px;letter-spacing:-1px}
.hero h1 span{color:var(--accent)}
.hero p{font-size:17px;line-height:1.8;color:rgba(255,255,255,.85);margin-bottom:36px;max-width:620px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:48px}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;border-top:1px solid rgba(255,255,255,.15);padding-top:32px}
.hero-stat .num{font-size:32px;font-weight:800;color:#fff}
.hero-stat .label{font-size:14px;color:rgba(255,255,255,.65)}

/* Card base */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:var(--transition)}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}

/* Intro section */
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.intro-media{position:relative;border-radius:24px;overflow:hidden;box-shadow:var(--shadow)}
.intro-media img{width:100%;height:100%;object-fit:cover;min-height:380px}
.intro-media::after{content:'';position:absolute;inset:0;background:linear-gradient(to top,rgba(2,6,23,.4),transparent)}
.intro-badge{position:absolute;bottom:20px;left:20px;z-index:2;background:rgba(255,255,255,.95);padding:12px 20px;border-radius:14px;box-shadow:var(--shadow)}
.intro-badge span{display:block;font-size:13px;color:var(--text-muted)}
.intro-badge strong{font-size:20px;color:var(--primary)}
.intro-copy h2{font-size:32px;font-weight:800;color:var(--primary);line-height:1.3;margin-bottom:16px}
.intro-copy p{color:var(--text-muted);font-size:15px;margin-bottom:24px;line-height:1.9}
.intro-list li{display:flex;align-items:flex-start;gap:12px;padding:10px 0;color:#334155}
.intro-list li i{color:var(--accent);margin-top:4px;font-size:16px}

/* Category cards */
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.category-card{position:relative;background:var(--card);border-radius:20px;overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);border:1px solid rgba(15,23,42,.05);display:block}
.category-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-6px)}
.category-card-img{position:relative;height:200px;overflow:hidden}
.category-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.category-card:hover .category-card-img img{transform:scale(1.06)}
.category-card-img::after{content:'';position:absolute;inset:0;background:linear-gradient(to top,rgba(15,23,42,.5),transparent)}
.category-card-body{padding:24px 24px 28px}
.category-card-body h3{font-size:19px;font-weight:700;color:var(--primary);margin-bottom:8px}
.category-card-body p{color:var(--text-muted);font-size:14px;line-height:1.7}
.category-card-body .card-link{display:inline-flex;align-items:center;gap:6px;margin-top:14px;color:var(--accent);font-weight:600;font-size:14px}
.category-card-body .card-link i{transition:transform .3s}
.category-card:hover .card-link i{transform:translateX(4px)}
.category-card-arrow{position:absolute;top:16px;right:16px;z-index:2;width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.9);display:flex;align-items:center;justify-content:center;color:var(--primary);box-shadow:var(--shadow)}

/* Post list */
.post-list{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.post-card{display:block;background:var(--card);border:1px solid rgba(15,23,42,.06);border-radius:16px;padding:22px;box-shadow:0 2px 12px rgba(15,23,42,.04);transition:var(--transition)}
.post-card:hover{border-color:rgba(245,158,11,.3);box-shadow:var(--shadow);transform:translateY(-3px)}
.post-meta{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.post-category{background:rgba(245,158,11,.1);color:#b45309;font-size:12px;font-weight:600;padding:3px 12px;border-radius:999px}
.post-date{font-size:13px;color:#94a3b8;display:flex;align-items:center;gap:5px}
.post-card h3{font-size:17px;font-weight:700;color:var(--primary);margin-bottom:8px;line-height:1.5}
.post-card p{font-size:14px;color:var(--text-muted);line-height:1.7;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.empty-tip{grid-column:1/-1;text-align:center;padding:48px 0;color:var(--text-muted);background:#fff;border-radius:16px;border:1px dashed var(--border)}

/* Stats dark section */
.stats-section{position:relative;background-size:cover;background-position:center;color:#fff;padding:76px 0}
.stats-section::before{content:'';position:absolute;inset:0;background:rgba(2,6,23,.82)}
.stats-grid{position:relative;z-index:2;display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
.stat-item{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:20px;padding:36px 24px;backdrop-filter:blur(8px)}
.stat-item i{font-size:32px;color:var(--accent);margin-bottom:14px}
.stat-num{display:block;font-size:36px;font-weight:900;margin-bottom:6px;color:#fff}
.stat-label{font-size:14px;color:rgba(255,255,255,.7)}

/* Process */
.process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;counter-reset:step}
.step-item{position:relative;background:#fff;border-radius:20px;padding:36px 24px 28px;box-shadow:var(--shadow);border-top:4px solid var(--accent)}
.step-num{width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800;margin-bottom:20px;box-shadow:0 4px 12px rgba(15,23,42,.2)}
.step-item h3{font-size:17px;font-weight:700;color:var(--primary);margin-bottom:10px}
.step-item p{font-size:14px;color:var(--text-muted);line-height:1.7}

/* FAQ */
.faq-wrapper{max-width:820px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:16px;margin-bottom:14px;overflow:hidden;box-shadow:0 2px 8px rgba(15,23,42,.03)}
.faq-item summary{display:flex;justify-content:space-between;align-items:center;cursor:pointer;padding:20px 24px;font-weight:600;color:var(--primary);font-size:16px;list-style:none;transition:var(--transition)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'\f078';font-family:'Font Awesome 6 Free';font-weight:900;font-size:14px;color:var(--accent);transition:transform .3s}
.faq-item[open] summary::after{transform:rotate(180deg)}
.faq-item summary:hover{background:#f8fafc}
.faq-item .faq-body{padding:0 24px 20px;color:var(--text-muted);font-size:14px;line-height:1.8;border-top:1px dashed var(--border);padding-top:16px}

/* CTA */
.cta-section{position:relative;padding:90px 0;text-align:center;color:#fff;overflow:hidden}
.cta-section::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,#0f172a,#1e3a8a)}
.cta-section .container{position:relative;z-index:2}
.cta-section h2{font-size:36px;font-weight:800;margin-bottom:14px}
.cta-section p{font-size:16px;color:rgba(255,255,255,.8);margin-bottom:32px;max-width:520px;margin-left:auto;margin-right:auto}

/* Footer */
.footer{background:var(--primary-dark);color:#94a3b8;padding-top:70px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:48px;padding-bottom:50px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-logo{font-size:22px;font-weight:800;color:#fff;display:inline-block;margin-bottom:14px}
.footer-brand p{font-size:14px;line-height:1.8;color:#64748b;max-width:320px}
.footer-col h4{font-size:15px;font-weight:700;color:#fff;margin-bottom:18px}
.footer-col a{display:block;padding:5px 0;font-size:14px;color:#94a3b8}
.footer-col a:hover{color:var(--accent);padding-left:6px}
.footer-col p{font-size:14px;line-height:1.8;color:#94a3b8}
.footer-col i{color:var(--accent);margin-right:8px}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding:22px 0;font-size:13px;color:#64748b}

/* Page hero internal */
.page-hero{position:relative;padding:80px 0;background-size:cover;background-position:center;color:#fff}
.page-hero::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(2,6,23,.9),rgba(15,23,42,.65))}
.page-hero .container{position:relative;z-index:2}
.page-hero h1{font-size:40px;font-weight:900;margin-bottom:12px}
.page-hero p{max-width:680px;font-size:16px;color:rgba(255,255,255,.8)}

/* Breadcrumb */
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;font-size:13px;color:rgba(255,255,255,.65);margin-bottom:14px}
.breadcrumb a{color:rgba(255,255,255,.85)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb i{font-size:11px}

/* Feature cards */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.feature-card{background:#fff;border-radius:20px;padding:32px 28px;box-shadow:var(--shadow);border:1px solid rgba(15,23,42,.05);transition:var(--transition)}
.feature-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.feature-icon{width:56px;height:56px;border-radius:16px;background:linear-gradient(135deg,rgba(245,158,11,.12),rgba(245,158,11,.05));display:flex;align-items:center;justify-content:center;margin-bottom:20px}
.feature-icon i{font-size:24px;color:#b45309}
.feature-card h3{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:10px}
.feature-card p{font-size:14px;color:var(--text-muted);line-height:1.75}

/* Timeline for tutorials */
.timeline{max-width:760px;margin:0 auto;position:relative}
.timeline::before{content:'';position:absolute;left:24px;top:0;bottom:0;width:2px;background:linear-gradient(to bottom,var(--accent),rgba(245,158,11,.1))}
.timeline-item{position:relative;padding-left:72px;padding-bottom:40px}
.timeline-item::before{content:'';position:absolute;left:16px;top:4px;width:18px;height:18px;border-radius:50%;background:var(--accent);border:4px solid #fff;box-shadow:0 0 0 3px rgba(245,158,11,.3)}
.timeline-num{position:absolute;left:0;top:0;width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;box-shadow:var(--shadow)}
.timeline-item h3{font-size:19px;font-weight:700;color:var(--primary);margin-bottom:8px}
.timeline-item p{font-size:14px;color:var(--text-muted);line-height:1.8}
.timeline-item .timeline-tag{display:inline-block;background:rgba(245,158,11,.1);color:#b45309;font-size:12px;font-weight:600;padding:2px 10px;border-radius:999px;margin-bottom:10px}

/* Article content */
.article-wrapper{max-width:860px;margin:0 auto}
.article-card{background:#fff;border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.article-header{padding:48px 48px 24px}
.article-header h1{font-size:34px;font-weight:800;color:var(--primary);line-height:1.4;margin-bottom:16px}
.article-meta{display:flex;flex-wrap:wrap;gap:18px;color:#94a3b8;font-size:14px;border-bottom:1px solid var(--border);padding-bottom:20px}
.article-meta i{color:var(--accent)}
.article-body{padding:32px 48px 48px}
.article-body p{font-size:15px;color:#334155;line-height:2;margin-bottom:20px}
.article-body h2,.article-body h3{color:var(--primary);font-weight:700;margin:32px 0 16px}
.article-body ul{margin-bottom:20px;padding-left:8px}
.article-body ul li{position:relative;padding:6px 0 6px 24px;color:#334155;font-size:15px}
.article-body ul li::before{content:'\f00c';font-family:'Font Awesome 6 Free';font-weight:900;font-size:13px;color:var(--accent);position:absolute;left:0;top:9px}
.article-cover{width:100%;height:280px;object-fit:cover}
.article-footer{padding:24px 48px 40px;border-top:1px solid var(--border)}
.article-tags{display:flex;flex-wrap:wrap;gap:10px}
.article-tag{background:#f1f5f9;color:var(--primary);font-size:13px;padding:6px 14px;border-radius:999px}

/* Contact / support card */
.support-card{background:#fff;border-radius:24px;box-shadow:var(--shadow);padding:48px;text-align:center;max-width:720px;margin:0 auto}
.support-card h3{font-size:26px;font-weight:800;color:var(--primary);margin-bottom:10px}
.support-card p{color:var(--text-muted);margin-bottom:30px}
.support-channels{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:30px}
.support-channel{background:#f8fafc;border:1px solid var(--border);border-radius:16px;padding:24px 16px;transition:var(--transition)}
.support-channel:hover{border-color:var(--accent);background:#fff}
.support-channel i{font-size:28px;color:var(--accent);margin-bottom:10px}
.support-channel h4{font-size:16px;font-weight:700;color:var(--primary)}
.support-channel p{font-size:13px;color:var(--text-muted);margin-bottom:0}

/* Responsive */
@media(max-width:1024px){
.section{padding:60px 0}
.intro-grid{gap:36px}
.category-grid{gap:20px}
.process-grid{grid-template-columns:repeat(2,1fr)}
.stats-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:1fr 1fr}
.hero h1{font-size:42px}
}
@media(max-width:768px){
.site-header .desktop-nav{display:none}
.site-header .header-cta{display:none}
.hero{min-height:540px;padding:60px 0}
.hero h1{font-size:36px}
.hero p{font-size:15px}
.hero-stats{grid-template-columns:repeat(2,1fr)}
.intro-grid{grid-template-columns:1fr}
.intro-media img{min-height:260px}
.category-grid{grid-template-columns:1fr}
.post-list{grid-template-columns:1fr}
.section-title{font-size:28px}
.footer-grid{grid-template-columns:1fr}
.footer-bottom{flex-direction:column;text-align:center}
.page-hero h1{font-size:32px}
.article-header{padding:32px 24px 20px}
.article-body{padding:24px}
.article-footer{padding:20px 24px 32px}
.article-header h1{font-size:28px}
.article-cover{height:200px}
.support-card{padding:32px 24px}
.support-channels{grid-template-columns:1fr}
}
@media(max-width:520px){
.container{padding:0 18px}
.section{padding:48px 0}
.hero h1{font-size:30px}
.hero-stats{grid-template-columns:1fr 1fr;gap:16px}
.hero-stat .num{font-size:24px}
.process-grid{grid-template-columns:1fr}
.stats-grid{grid-template-columns:1fr}
.header-inner{height:64px}
.logo-text{font-size:16px}
.logo-icon{width:34px;height:34px;font-size:13px}
.feature-grid{grid-template-columns:1fr}
.timeline-item{padding-left:60px}
.timeline-num{width:40px;height:40px;font-size:14px}
.timeline::before{left:20px}
.timeline-item::before{left:13px}
}

/* roulang page: category1 */
:root {
            --primary: #3366ff;
            --primary-dark: #1434b5;
            --dark: #0b1220;
            --bg: #f8fafc;
            --text: #1e293b;
            --text-light: #64748b;
            --border: #e2e8f0;
            --radius: 16px;
            --shadow: 0 4px 20px rgba(0,0,0,0.06);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
            color: var(--text);
            background: var(--bg);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all .2s ease;
        }
        img {
            max-width: 100%;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226,232,240,0.8);
            box-shadow: 0 1px 8px rgba(0,0,0,0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, #3366ff, #22d3ee);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 15px;
            letter-spacing: -0.5px;
            box-shadow: 0 4px 12px rgba(51,102,255,0.3);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #0b1220;
            letter-spacing: -0.3px;
        }
        .desktop-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-link {
            padding: 8px 18px;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 500;
            color: #475569;
            transition: all .2s;
        }
        .nav-link:hover {
            background: #f1f5f9;
            color: #1e293b;
        }
        .nav-link.active {
            background: linear-gradient(135deg, rgba(51,102,255,0.1), rgba(34,211,238,0.08));
            color: #1a4dff;
            font-weight: 600;
        }
        .header-cta {
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 600;
            line-height: 1.4;
            border: none;
            cursor: pointer;
            transition: all .2s ease;
            text-decoration: none;
        }
        .btn-primary {
            background: linear-gradient(135deg, #3366ff, #1a4dff);
            color: #fff;
            box-shadow: 0 4px 14px rgba(51,102,255,0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(51,102,255,0.4);
        }
        .btn-outline {
            border: 2px solid rgba(255,255,255,0.6);
            color: #fff;
            background: transparent;
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.15);
            border-color: #fff;
        }
        .btn-light {
            background: #fff;
            color: #1a4dff;
            box-shadow: 0 4px 14px rgba(0,0,0,0.08);
        }
        .btn-light:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.12);
        }
        /* ===== Mobile Bottom Tab ===== */
        .mobile-tabbar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: #fff;
            border-top: 1px solid #e2e8f0;
            z-index: 200;
            box-shadow: 0 -4px 20px rgba(0,0,0,0.05);
        }
        .tabbar-inner {
            display: flex;
            align-items: center;
            justify-content: space-around;
            height: 60px;
        }
        .tabbar-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            font-size: 11px;
            color: #94a3b8;
            transition: color .2s;
            flex: 1;
            padding: 4px 0;
        }
        .tabbar-item i {
            font-size: 18px;
        }
        .tabbar-item.active {
            color: #1a4dff;
            font-weight: 600;
        }
        /* ===== Hero ===== */
        .page-hero {
            position: relative;
            padding: 110px 0 80px;
            background: linear-gradient(135deg, #0b1220 0%, #162e8a 50%, #1a4dff 100%);
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -20%;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(34,211,238,0.15), transparent 60%);
        }
        .page-hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, #f8fafc, transparent);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.2;
            z-index: 0;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.12);
            border: 1px solid rgba(255,255,255,0.2);
            color: #fff;
            padding: 6px 16px;
            border-radius: 40px;
            font-size: 13px;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-title {
            font-size: 46px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            letter-spacing: -1px;
            margin-bottom: 20px;
        }
        .hero-title span {
            background: linear-gradient(90deg, #22d3ee, #fff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-desc {
            font-size: 17px;
            color: rgba(255,255,255,0.85);
            max-width: 620px;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        /* ===== Section ===== */
        .section {
            padding: 90px 0;
        }
        .section-alt {
            background: #fff;
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 1px;
            text-transform: uppercase;
            color: #1a4dff;
            margin-bottom: 8px;
            background: rgba(51,102,255,0.08);
            padding: 4px 14px;
            border-radius: 20px;
        }
        .section-title {
            font-size: 34px;
            font-weight: 800;
            color: #0b1220;
            line-height: 1.25;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 16px;
            color: #64748b;
            max-width: 680px;
            line-height: 1.7;
        }
        .section-header {
            margin-bottom: 48px;
        }
        .section-header.center {
            text-align: center;
        }
        .section-header.center .section-desc {
            margin-left: auto;
            margin-right: auto;
        }
        /* ===== Cards ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card {
            background: #fff;
            border-radius: 16px;
            padding: 32px 28px;
            border: 1px solid #e2e8f0;
            box-shadow: 0 4px 20px rgba(0,0,0,0.04);
            transition: all .25s ease;
            position: relative;
            overflow: hidden;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.1);
            border-color: rgba(51,102,255,0.3);
        }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
            color: #fff;
        }
        .card-icon.blue {
            background: linear-gradient(135deg, #3366ff, #4f8cff);
        }
        .card-icon.cyan {
            background: linear-gradient(135deg, #06b6d4, #22d3ee);
        }
        .card-icon.purple {
            background: linear-gradient(135deg, #7c3aed, #a78bfa);
        }
        .card-title {
            font-size: 20px;
            font-weight: 700;
            color: #0b1220;
            margin-bottom: 10px;
        }
        .card-text {
            font-size: 15px;
            color: #64748b;
            line-height: 1.7;
        }
        .card-link {
            margin-top: 16px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: #1a4dff;
        }
        .card-link:hover {
            gap: 10px;
        }
        /* ===== Steps ===== */
        .steps-wrap {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 48px;
        }
        .step-item {
            text-align: center;
            padding: 32px 20px;
            background: #fff;
            border-radius: 16px;
            border: 1px solid #e2e8f0;
            transition: all .25s;
            position: relative;
        }
        .step-item:hover {
            box-shadow: 0 12px 32px rgba(0,0,0,0.08);
            transform: translateY(-4px);
        }
        .step-num {
            width: 44px;
            height: 44px;
            margin: 0 auto 16px;
            background: linear-gradient(135deg, #3366ff, #22d3ee);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            box-shadow: 0 6px 16px rgba(51,102,255,0.3);
        }
        .step-title {
            font-size: 17px;
            font-weight: 700;
            color: #0b1220;
            margin-bottom: 8px;
        }
        .step-text {
            font-size: 14px;
            color: #64748b;
            line-height: 1.6;
        }
        /* ===== Feature list ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .feature-image {
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 20px 50px rgba(0,0,0,0.12);
        }
        .feature-image img {
            width: 100%;
            height: 420px;
            object-fit: cover;
        }
        .feature-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .feature-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            padding: 20px;
            background: #fff;
            border-radius: 14px;
            border: 1px solid #e2e8f0;
            transition: all .2s;
        }
        .feature-item:hover {
            box-shadow: 0 8px 24px rgba(0,0,0,0.07);
        }
        .feature-item-icon {
            width: 42px;
            height: 42px;
            border-radius: 10px;
            background: rgba(51,102,255,0.1);
            color: #1a4dff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 17px;
            flex-shrink: 0;
        }
        .feature-item-title {
            font-size: 16px;
            font-weight: 700;
            color: #0b1220;
            margin-bottom: 4px;
        }
        .feature-item-text {
            font-size: 14px;
            color: #64748b;
            line-height: 1.6;
        }
        /* ===== Stats ===== */
        .stats-band {
            background: linear-gradient(135deg, #0b1220, #162e8a);
            padding: 80px 0;
            position: relative;
            overflow: hidden;
        }
        .stats-band::before {
            content: '';
            position: absolute;
            top: -200px;
            left: -100px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(34,211,238,0.08);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            text-align: center;
            position: relative;
            z-index: 2;
        }
        .stat-item {
            padding: 20px;
        }
        .stat-num {
            font-size: 44px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 8px;
        }
        .stat-num span {
            color: #22d3ee;
        }
        .stat-label {
            font-size: 15px;
            color: rgba(255,255,255,0.7);
        }
        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff;
            border: 1px solid #e2e8f0;
            border-radius: 14px;
            margin-bottom: 16px;
            overflow: hidden;
            transition: all .2s;
        }
        .faq-item:hover {
            border-color: rgba(51,102,255,0.3);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: #0b1220;
            transition: background .2s;
        }
        .faq-question:hover {
            background: #f8fafc;
        }
        .faq-question i {
            color: #1a4dff;
            font-size: 14px;
            transition: transform .3s;
        }
        .faq-item.open .faq-question i {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s ease;
            background: #fafbff;
        }
        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 15px;
            color: #475569;
            line-height: 1.7;
            border-top: 1px solid #eef2f7;
            padding-top: 16px;
        }
        .faq-item.open .faq-answer {
            max-height: 500px;
        }
        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            position: relative;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
        }
        .cta-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,18,32,0.92), rgba(26,77,255,0.85));
        }
        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 680px;
            margin: 0 auto;
        }
        .cta-title {
            font-size: 36px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .cta-text {
            font-size: 17px;
            color: rgba(255,255,255,0.85);
            margin-bottom: 32px;
            line-height: 1.7;
        }
        /* ===== Footer ===== */
        .footer {
            background: #0b1220;
            color: #94a3b8;
            padding: 70px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 48px;
        }
        .footer-logo {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            display: inline-block;
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 15px;
            line-height: 1.7;
            color: #94a3b8;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-col a {
            display: block;
            color: #94a3b8;
            font-size: 15px;
            margin-bottom: 12px;
            transition: color .2s;
        }
        .footer-col a:hover {
            color: #22d3ee;
        }
        .footer-col p {
            font-size: 14px;
            margin-bottom: 10px;
            color: #94a3b8;
            line-height: 1.6;
        }
        .footer-col i {
            color: #22d3ee;
            margin-right: 8px;
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 28px;
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 14px;
            color: #64748b;
        }
        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero-title {
                font-size: 38px;
            }
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-wrap {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .desktop-nav {
                display: none;
            }
            .header-cta {
                display: none;
            }
            .mobile-tabbar {
                display: block;
            }
            body {
                padding-bottom: 60px;
            }
            .page-hero {
                padding: 80px 0 60px;
            }
            .hero-title {
                font-size: 30px;
            }
            .hero-desc {
                font-size: 15px;
            }
            .section {
                padding: 64px 0;
            }
            .section-title {
                font-size: 28px;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .steps-wrap {
                grid-template-columns: 1fr;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .feature-image img {
                height: 280px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .stat-num {
                font-size: 34px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-title {
                font-size: 28px;
            }
        }
        @media (max-width: 520px) {
            .card-grid {
                gap: 16px;
            }
            .hero-title {
                font-size: 26px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .section-header.center .section-desc {
                font-size: 14px;
            }
        }

/* roulang page: article */
:root {
            --primary: #1e3a8a;
            --primary-light: #3b82f6;
            --primary-dark: #0b1b3b;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg: #f8fafc;
            --surface: #ffffff;
            --text: #0f172a;
            --text-weak: #64748b;
            --border: #e2e8f0;
            --radius: 14px;
            --radius-lg: 20px;
            --shadow: 0 10px 30px rgba(15, 23, 42, .06);
            --shadow-lg: 0 20px 50px rgba(15, 23, 42, .12);
            --transition: all .25s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            border: 2px solid transparent;
            transition: var(--transition);
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(30, 58, 138, .25);
        }

        .btn-outline {
            background: transparent;
            border-color: var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-1px);
        }

        .btn-accent {
            background: var(--accent);
            color: #0b1b3b;
        }

        .btn-accent:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(245, 158, 11, .35);
        }

        .btn-outline-light {
            border-color: rgba(255, 255, 255, .7);
            color: #fff;
        }

        .btn-outline-light:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, .12);
            transform: translateY(-1px);
        }

        .btn-block {
            width: 100%;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 700;
            background: rgba(245, 158, 11, .14);
            color: #b45309;
        }

        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            background: rgba(245, 158, 11, .12);
            color: #b45309;
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .section-head h2 {
            font-size: clamp(24px, 3.2vw, 36px);
            font-weight: 800;
            color: var(--text);
            line-height: 1.3;
            margin-bottom: 12px;
        }

        .section-head p {
            color: var(--text-weak);
            font-size: 15px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .9);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            gap: 24px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 16px;
            letter-spacing: .5px;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: .5px;
        }

        .desktop-nav {
            display: flex;
            gap: 4px;
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 15px;
            color: var(--text-weak);
            font-weight: 500;
            transition: var(--transition);
        }

        .nav-link:hover {
            color: var(--primary);
            background: rgba(30, 58, 138, .06);
        }

        .nav-link.active {
            color: #fff;
            background: var(--primary);
        }

        .header-cta {
            flex-shrink: 0;
        }

        .mobile-tabs {
            display: none;
        }

        .article-hero {
            position: relative;
            background-color: #0b1b3b;
            background-size: cover;
            background-position: center;
            color: #fff;
            padding: 80px 0;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 27, 59, .92), rgba(30, 58, 138, .65));
        }

        .article-hero-inner {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, .8);
            margin-bottom: 18px;
        }

        .breadcrumb a:hover {
            color: var(--accent);
        }

        .breadcrumb i {
            font-size: 12px;
            color: rgba(255, 255, 255, .5);
        }

        .article-hero .badge {
            background: var(--accent);
            color: #0b1b3b;
            margin-bottom: 12px;
        }

        .article-hero h1 {
            font-size: clamp(28px, 4vw, 42px);
            font-weight: 800;
            line-height: 1.25;
            margin: 14px 0 18px;
            max-width: 840px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: rgba(255, 255, 255, .85);
        }

        .article-meta i {
            margin-right: 6px;
            color: var(--accent-light);
        }

        .article-body-section {
            padding: 60px 0;
        }

        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 320px;
            gap: 40px;
            align-items: start;
        }

        .article-card {
            background: var(--surface);
            border-radius: 16px;
            padding: 32px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }

        .article-content {
            font-size: 16px;
            line-height: 1.85;
            color: #334155;
        }

        .article-content h2 {
            font-size: 24px;
            margin: 32px 0 14px;
            color: var(--text);
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border);
        }

        .article-content h3 {
            font-size: 20px;
            margin: 26px 0 10px;
            color: var(--text);
        }

        .article-content p {
            margin: 14px 0;
        }

        .article-content ul,
        .article-content ol {
            margin: 14px 0 14px 24px;
            list-style: disc;
        }

        .article-content ol {
            list-style: decimal;
        }

        .article-content li {
            margin: 6px 0;
        }

        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: #fffbf0;
            padding: 14px 18px;
            border-radius: 8px;
            margin: 20px 0;
            color: #57534e;
        }

        .article-content img {
            border-radius: 12px;
            margin: 24px 0;
        }

        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 4px;
        }

        .article-content a:hover {
            color: var(--accent);
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 14px;
        }

        .article-content th,
        .article-content td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }

        .article-content th {
            background: #f1f5f9;
            font-weight: 600;
        }

        .article-content code {
            background: #f1f5f9;
            padding: 2px 8px;
            border-radius: 6px;
            font-size: 14px;
        }

        .article-side {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .side-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 24px;
            box-shadow: var(--shadow);
        }

        .side-card h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--text);
            padding-left: 12px;
            border-left: 4px solid var(--accent);
        }

        .side-card a {
            display: block;
            padding: 8px 0;
            color: var(--text-weak);
            font-size: 14px;
            transition: var(--transition);
        }

        .side-card a:hover {
            color: var(--primary);
            padding-left: 8px;
        }

        .side-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            font-size: 14px;
            color: var(--text-weak);
        }

        .side-list i {
            color: var(--accent);
            width: 20px;
            text-align: center;
        }

        .side-contact p {
            font-size: 14px;
            color: var(--text-weak);
            margin: 10px 0 16px;
            line-height: 1.6;
        }

        .category-section {
            padding: 70px 0;
            background: linear-gradient(180deg, #f8fafc, #eef2f7);
        }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .category-card {
            background: var(--surface);
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }

        .category-card img {
            height: 180px;
            width: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

        .category-card:hover img {
            transform: scale(1.04);
        }

        .category-card .card-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .category-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }

        .category-card p {
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.6;
            margin-bottom: 16px;
            flex: 1;
        }

        .category-card .btn {
            margin-top: auto;
            align-self: flex-start;
        }

        .cta-section {
            padding: 100px 0;
            background-color: #0b1b3b;
            background-size: cover;
            background-position: center;
            position: relative;
            color: #fff;
            text-align: center;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(11, 27, 59, .82);
        }

        .cta-inner {
            position: relative;
            z-index: 1;
        }

        .cta-inner h2 {
            font-size: clamp(24px, 3vw, 36px);
            font-weight: 800;
            margin-bottom: 14px;
        }

        .cta-inner p {
            color: rgba(255, 255, 255, .85);
            margin-bottom: 28px;
            font-size: 16px;
        }

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

        .faq-section {
            padding: 70px 0;
        }

        .faq-grid {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            overflow: hidden;
            transition: border-color .25s;
        }

        .faq-item.open {
            border-color: var(--accent);
        }

        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 22px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            transition: var(--transition);
            gap: 16px;
        }

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

        .faq-question i {
            transition: transform .3s;
            color: var(--accent);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 22px 18px;
            color: var(--text-weak);
            font-size: 14px;
            line-height: 1.7;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        .not-found-section {
            padding: 120px 0;
            text-align: center;
        }

        .not-found-section h1 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .not-found-section p {
            color: var(--text-weak);
            margin-bottom: 28px;
            font-size: 16px;
        }

        .footer {
            background: #0b1b3b;
            color: #cbd5e1;
            padding: 70px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 50px;
        }

        .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: #fff;
        }

        .footer-brand p {
            margin-top: 16px;
            font-size: 14px;
            line-height: 1.7;
            color: #94a3b8;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: #94a3b8;
            font-size: 14px;
            padding: 5px 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent);
        }

        .footer-col p {
            font-size: 14px;
            color: #94a3b8;
            margin: 6px 0;
        }

        .footer-col i {
            color: var(--accent);
            margin-right: 8px;
            width: 18px;
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 13px;
            color: #64748b;
        }

        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }

            .article-side {
                order: 2;
            }

            .category-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .desktop-nav,
            .header-cta {
                display: none;
            }

            .mobile-tabs {
                display: flex;
                position: fixed;
                bottom: 0;
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, .95);
                backdrop-filter: blur(10px);
                -webkit-backdrop-filter: blur(10px);
                border-top: 1px solid var(--border);
                z-index: 1000;
                padding-bottom: env(safe-area-inset-bottom);
                box-shadow: 0 -4px 16px rgba(15, 23, 42, .06);
            }

            .mobile-tabs a {
                flex: 1;
                text-align: center;
                padding: 10px 0 8px;
                font-size: 11px;
                color: var(--text-weak);
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 4px;
                transition: var(--transition);
            }

            .mobile-tabs a i {
                font-size: 18px;
            }

            .mobile-tabs a.active {
                color: var(--primary);
                font-weight: 600;
            }

            body {
                padding-bottom: 64px;
            }

            .article-hero {
                padding: 50px 0;
            }

            .article-card {
                padding: 20px;
            }

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

            .category-section,
            .faq-section {
                padding: 50px 0;
            }

            .cta-section {
                padding: 60px 0;
                background-attachment: scroll;
            }

            .cta-actions {
                flex-direction: column;
                align-items: center;
            }

            .cta-actions .btn {
                width: 100%;
                max-width: 280px;
            }

            .faq-question {
                padding: 16px 18px;
            }

            .footer {
                padding: 50px 0 90px;
            }
        }

        @media (max-width: 520px) {
            .header-inner {
                height: 60px;
            }

            .logo-text {
                font-size: 17px;
            }

            .container {
                padding-left: 18px;
                padding-right: 18px;
            }

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

            .article-meta {
                gap: 12px;
                font-size: 13px;
            }

            .article-content {
                font-size: 15px;
            }
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
:root {
  --primary: #1e293b;
  --primary-light: #334155;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --accent-light: #fbbf24;
  --bg: #f8fafc;
  --bg-white: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.05);
  --shadow: 0 8px 30px rgba(0,0,0,.08);
  --shadow-lg: 0 24px 50px rgba(0,0,0,.12);
  --transition: .25s ease;
}

/* ===== 基础 Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}
button, input, select, textarea {
  font: inherit;
  outline: none;
}
ul, ol {
  list-style: none;
}
h1, h2, h3, h4, h5 {
  line-height: 1.3;
  font-weight: 700;
}
:focus-visible {
  outline: 3px solid rgba(245, 158, 11, .55);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== 容器 ===== */
.container {
  width: min(1200px, 92%);
  margin-inline: auto;
}
.container-sm {
  width: min(880px, 92%);
  margin-inline: auto;
}

/* ===== 站点头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226,232,240,.7);
  box-shadow: 0 2px 24px rgba(15,23,42,.04);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(245,158,11,.35);
  letter-spacing: .5px;
}
.logo-text {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -.5px;
  white-space: nowrap;
}
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-inline: auto;
}
.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 999px;
  transition: all var(--transition);
}
.nav-link:hover {
  color: var(--primary);
  background: #f1f5f9;
}
.nav-link.active {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 4px 14px rgba(30,41,59,.25);
}
.header-cta {
  flex-shrink: 0;
  white-space: nowrap;
}

/* ===== 共享按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 26px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  box-shadow: 0 4px 16px rgba(245,158,11,.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(245,158,11,.45);
  color: #fff;
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(245,158,11,.3);
}
.btn-secondary {
  background: #fff;
  color: var(--primary);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn-secondary:active {
  transform: translateY(0);
}
.btn-light {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0,0,0,.1);
}
.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255,255,255,.3);
  background: #fff;
  color: var(--accent-dark);
}
.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
  border-radius: 10px;
}
.btn-lg {
  padding: 15px 38px;
  font-size: 16px;
  border-radius: 14px;
}

/* ===== 页面 Hero ===== */
.page-hero {
  position: relative;
  padding: 90px 0 100px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: #fff;
  isolation: isolate;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(15,23,42,.9) 0%, rgba(30,41,59,.76) 50%, rgba(15,23,42,.65) 100%);
  z-index: -1;
}
.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: .08;
  z-index: -1;
}
.hero-content {
  max-width: 720px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(245,158,11,.15);
  border: 1px solid rgba(245,158,11,.4);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: #fbbf24;
  letter-spacing: .5px;
  margin-bottom: 22px;
}
.hero-badge i {
  font-size: 12px;
}
.hero-content h1 {
  font-size: 46px;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 18px;
}
.hero-content h1 span {
  color: #fbbf24;
}
.hero-content p {
  font-size: 17px;
  color: rgba(255,255,255,.85);
  line-height: 1.8;
  margin-bottom: 30px;
  max-width: 580px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-stat-row {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,.14);
}
.hero-stat-item {
  text-align: left;
}
.hero-stat-item strong {
  display: block;
  font-size: 30px;
  font-weight: 800;
  color: #fbbf24;
  letter-spacing: -1px;
}
.hero-stat-item span {
  font-size: 13px;
  color: rgba(255,255,255,.7);
}

/* ===== 通用 Section ===== */
.section {
  position: relative;
  padding: 90px 0;
}
.section-alt {
  background: var(--bg);
}
.section-white {
  background: #fff;
}
.section-head {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: 56px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  background: rgba(245,158,11,.12);
  color: var(--accent-dark);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .5px;
  margin-bottom: 14px;
}
.section-tag i {
  font-size: 11px;
}
.section-head h2 {
  font-size: 34px;
  letter-spacing: -.8px;
  margin-bottom: 12px;
  color: var(--text);
}
.section-head p {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.7;
}

/* ===== 分类卡片 ===== */
.category-card {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  height: 100%;
}
.category-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
  opacity: 0;
  transition: opacity var(--transition);
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(245,158,11,.35);
}
.category-card:hover::after {
  opacity: 1;
}
.category-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: #fff;
  background: linear-gradient(135deg, #1e293b, #334155);
  border-radius: 16px;
  margin-bottom: 18px;
  box-shadow: 0 8px 20px rgba(30,41,59,.2);
  transition: all var(--transition);
}
.category-card:hover .category-icon {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  box-shadow: 0 8px 24px rgba(245,158,11,.3);
}
.category-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text);
}
.category-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}
.category-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-dark);
}
.category-link i {
  font-size: 12px;
  transition: transform var(--transition);
}
.category-card:hover .category-link i {
  transform: translateX(4px);
}

/* ===== 文章卡片 ===== */
.article-card {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.article-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
}
.article-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.article-card:hover .article-media img {
  transform: scale(1.06);
}
.article-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 5px 14px;
  background: rgba(15,23,42,.82);
  backdrop-filter: blur(6px);
  color: #fbbf24;
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  letter-spacing: .3px;
}
.article-body {
  padding: 26px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.article-body h3 {
  font-size: 17px;
  line-height: 1.45;
  margin-bottom: 10px;
  color: var(--text);
  transition: color var(--transition);
}
.article-body h3:hover {
  color: var(--accent-dark);
}
.article-body p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
  flex: 1;
}
.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid #f1f5f9;
  font-size: 13px;
  color: var(--text-muted);
}
.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.article-meta a {
  color: var(--accent-dark);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: gap var(--transition);
}
.article-meta a:hover {
  gap: 8px;
}

/* ===== 步骤流程 ===== */
.steps-section {
  background: linear-gradient(180deg, #f8fafc 0%, #eef2f7 100%);
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.step-item {
  position: relative;
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 28px 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.step-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.step-num {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  letter-spacing: -2px;
}
.step-item h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text);
}
.step-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.step-item::before {
  content: '';
  position: absolute;
  top: 50%;
  right: -16px;
  width: 24px;
  height: 2px;
  background: linear-gradient(90deg, rgba(245,158,11,.3), transparent);
  transform: translateY(-50%);
  z-index: 2;
}
.step-item:last-child::before {
  display: none;
}

/* ===== 教程列表 ===== */
.tutorial-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 820px;
  margin-inline: auto;
}
.tutorial-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  cursor: pointer;
}
.tutorial-item:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
  border-color: rgba(245,158,11,.4);
}
.tutorial-tag {
  flex-shrink: 0;
  min-width: 56px;
  text-align: center;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .3px;
  background: rgba(245,158,11,.14);
  color: var(--accent-dark);
}
.tutorial-tag.green {
  background: rgba(16,185,129,.12);
  color: #059669;
}
.tutorial-tag.blue {
  background: rgba(59,130,246,.12);
  color: #2563eb;
}
.tutorial-tag.purple {
  background: rgba(139,92,246,.1);
  color: #7c3aed;
}
.tutorial-info {
  flex: 1;
}
.tutorial-info h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.tutorial-info p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}
.tutorial-arrow {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #f1f5f9;
  color: var(--text-muted);
  transition: all var(--transition);
}
.tutorial-item:hover .tutorial-arrow {
  background: var(--accent);
  color: #fff;
  transform: rotate(-45deg);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item:hover {
  border-color: rgba(245,158,11,.35);
  box-shadow: var(--shadow);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  cursor: pointer;
  user-select: none;
}
.faq-question h3 {
  font-size: 16px;
  color: var(--text);
  font-weight: 600;
}
.faq-question i {
  color: var(--text-muted);
  font-size: 13px;
  transition: transform .35s ease, color .35s ease;
  flex-shrink: 0;
}
.faq-item.open .faq-question i {
  transform: rotate(180deg);
  color: var(--accent);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease, padding .3s ease;
  padding: 0 24px;
}
.faq-item.open .faq-answer {
  max-height: 240px;
  padding: 0 24px 22px;
}
.faq-answer p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
  padding-top: 4px;
  border-top: 1px dashed #e2e8f0;
}

/* ===== CTA ===== */
.cta-section {
  padding: 0 0 90px;
}
.cta-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: 60px 48px;
  text-align: center;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  box-shadow: var(--shadow-lg);
  color: #fff;
}
.cta-card::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(245,158,11,.18);
  filter: blur(40px);
}
.cta-card::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -40px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(245,158,11,.08);
  filter: blur(30px);
}
.cta-card h2 {
  font-size: 30px;
  margin-bottom: 12px;
  letter-spacing: -.5px;
  position: relative;
  z-index: 2;
}
.cta-card p {
  font-size: 16px;
  color: rgba(255,255,255,.75);
  margin-bottom: 28px;
  position: relative;
  z-index: 2;
}
.cta-card .btn {
  position: relative;
  z-index: 2;
}

/* ===== 页脚 ===== */
.footer {
  background: #0f172a;
  color: rgba(255,255,255,.75);
  padding: 72px 0 28px;
  position: relative;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer-brand .footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}
.footer-logo .logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,.6);
  max-width: 320px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
}
.footer-col a {
  display: block;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(255,255,255,.65);
  transition: color var(--transition), padding-left var(--transition);
}
.footer-col a:hover {
  color: #fbbf24;
  padding-left: 5px;
}
.footer-col p {
  font-size: 14px;
  color: rgba(255,255,255,.65);
  padding: 5px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-col p i {
  color: #fbbf24;
  width: 18px;
  text-align: center;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 28px;
  font-size: 13px;
  color: rgba(255,255,255,.45);
}

/* ===== 移动端底部 Tab ===== */
.mobile-tab-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(226,232,240,.75);
  padding: 6px 6px calc(8px + env(safe-area-inset-bottom));
  box-shadow: 0 -6px 30px rgba(15,23,42,.08);
  justify-content: space-around;
}
.mobile-tab-nav .tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 7px 4px;
  border-radius: 14px;
  font-size: 11px;
  font-weight: 600;
  color: #94a3b8;
  transition: all var(--transition);
  text-decoration: none;
}
.mobile-tab-nav .tab-item i {
  font-size: 18px;
  line-height: 1;
}
.mobile-tab-nav .tab-item:hover {
  color: var(--primary);
  background: #f1f5f9;
}
.mobile-tab-nav .tab-item.active {
  color: var(--accent-dark);
  background: rgba(245,158,11,.12);
}
.mobile-tab-nav .tab-item.active i {
  color: var(--accent);
}

/* ===== 响应式断点 ===== */
@media (max-width: 1024px) {
  .desktop-nav .nav-link {
    padding: 8px 12px;
    font-size: 14px;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .step-item::before {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }
  .header-cta {
    display: none;
  }
  .site-header {
    height: 64px;
  }
  .header-inner {
    height: 64px;
    justify-content: center;
  }
  .logo-text {
    font-size: 18px;
  }
  .page-hero {
    padding: 60px 0 70px;
  }
  .hero-content h1 {
    font-size: 30px;
  }
  .hero-content p {
    font-size: 15px;
  }
  .hero-stat-row {
    gap: 24px;
    margin-top: 32px;
  }
  .hero-stat-item strong {
    font-size: 24px;
  }
  .section {
    padding: 64px 0;
  }
  .section-head h2 {
    font-size: 27px;
  }
  .section-head p {
    font-size: 14px;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  .footer-brand {
    grid-column: span 2;
  }
  .cta-card {
    padding: 40px 24px;
  }
  .cta-card h2 {
    font-size: 24px;
  }
  .mobile-tab-nav {
    display: flex;
  }
  body {
    padding-bottom: 62px;
  }
}

@media (max-width: 520px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-brand {
    grid-column: span 1;
  }
  .btn-lg {
    width: 100%;
    justify-content: center;
  }
  .article-meta {
    flex-wrap: wrap;
    gap: 8px;
  }
  .tutorial-item {
    gap: 12px;
    padding: 16px;
  }
  .tutorial-tag {
    min-width: 46px;
    font-size: 11px;
    padding: 4px 6px;
  }
  .tutorial-info h3 {
    font-size: 14px;
  }
}

/* roulang page: category3 */
:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --secondary: #10b981;
            --dark: #0f172a;
            --light: #f8fafc;
            --border: #e2e8f0;
            --text: #1e293b;
            --muted: #64748b;
            --radius: 16px;
            --shadow: 0 10px 30px rgba(0,0,0,0.06);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--text);
            background: var(--light);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; height: auto; display: block; }
        button { cursor: pointer; border: none; background: none; }

        /* 通用按钮 */
        .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 12px; font-weight: 600; font-size: 15px; padding: 12px 28px; transition: all 0.25s ease; }
        .btn-primary { background: var(--primary); color: #fff !important; box-shadow: 0 4px 14px rgba(99,102,241,0.3); }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(99,102,241,0.4); }
        .btn-outline { border: 2px solid rgba(255,255,255,0.7); color: #fff !important; background: transparent; backdrop-filter: blur(4px); }
        .btn-outline:hover { background: rgba(255,255,255,0.12); border-color: #fff; }

        /* Header */
        .site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); }
        .header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
        .logo { display: flex; align-items: center; gap: 10px; }
        .logo-icon { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; border-radius: 12px; background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff; font-weight: 800; font-size: 16px; letter-spacing: -0.5px; box-shadow: 0 4px 12px rgba(99,102,241,0.3); }
        .logo-text { font-size: 20px; font-weight: 700; color: var(--dark); letter-spacing: 0.5px; }
        .desktop-nav { display: flex; align-items: center; gap: 6px; }
        .nav-link { padding: 8px 18px; border-radius: 10px; font-size: 15px; font-weight: 500; color: var(--muted); transition: all 0.2s ease; }
        .nav-link:hover { color: var(--primary); background: rgba(99,102,241,0.06); }
        .nav-link.active { color: var(--primary); background: rgba(99,102,241,0.1); font-weight: 600; }
        .header-cta { display: inline-flex; align-items: center; gap: 8px; padding: 10px 22px; border-radius: 12px; background: var(--primary); color: #fff !important; font-size: 14px; font-weight: 600; box-shadow: 0 4px 14px rgba(99,102,241,0.25); transition: all 0.2s ease; }
        .header-cta:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(99,102,241,0.35); }

        /* Hero */
        .faq-hero { position: relative; background: url('/assets/images/backpic/back-3.png') center/cover no-repeat; padding: 100px 0 90px; }
        .faq-hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(120deg, rgba(15,23,42,0.86), rgba(79,70,229,0.72)); }
        .faq-hero .container { position: relative; z-index: 2; }
        .hero-breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: rgba(255,255,255,0.75); margin-bottom: 20px; }
        .hero-breadcrumb a:hover { color: #fff; }
        .hero-title { font-size: 48px; font-weight: 800; line-height: 1.25; color: #fff; margin-bottom: 14px; }
        .hero-subtitle { font-size: 18px; color: rgba(255,255,255,0.8); max-width: 640px; margin-bottom: 36px; }
        .search-box { display: flex; align-items: center; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.25); border-radius: 16px; padding: 6px 6px 6px 20px; max-width: 560px; backdrop-filter: blur(8px); }
        .search-box i { color: rgba(255,255,255,0.7); margin-right: 12px; }
        .search-box input { flex: 1; background: transparent; border: none; outline: none; color: #fff; font-size: 15px; padding: 12px 0; }
        .search-box input::placeholder { color: rgba(255,255,255,0.5); }
        .search-box button { background: #fff; color: var(--primary); font-weight: 600; font-size: 14px; padding: 10px 28px; border-radius: 12px; transition: all 0.2s; }
        .search-box button:hover { background: #eef2ff; }

        /* 板块通用 */
        .section-pad { padding: 80px 0; }
        .section-head { text-align: center; max-width: 680px; margin: 0 auto 56px; }
        .section-tag { display: inline-block; padding: 6px 18px; border-radius: 999px; font-size: 13px; font-weight: 600; color: var(--primary); background: rgba(99,102,241,0.08); margin-bottom: 16px; letter-spacing: 0.5px; }
        .section-title { font-size: 34px; font-weight: 800; color: var(--dark); line-height: 1.3; margin-bottom: 14px; }
        .section-desc { font-size: 16px; color: var(--muted); line-height: 1.8; }

        /* 分类跳转卡片 */
        .pill-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: -40px; position: relative; z-index: 10; }
        .pill-card { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow); padding: 28px 22px; text-align: center; transition: all 0.3s ease; }
        .pill-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: rgba(99,102,241,0.35); }
        .pill-icon { width: 56px; height: 56px; margin: 0 auto 16px; display: flex; align-items: center; justify-content: center; border-radius: 14px; font-size: 22px; background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(139,92,246,0.12)); color: var(--primary); }
        .pill-card h3 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
        .pill-card p { font-size: 13px; color: var(--muted); line-height: 1.6; }
        .pill-link { margin-top: 14px; font-size: 13px; color: var(--primary); font-weight: 600; }

        /* 热门问题卡片 */
        .issue-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .issue-card { background: #fff; border-radius: 20px; border: 1px solid var(--border); box-shadow: var(--shadow); overflow: hidden; transition: all 0.3s ease; }
        .issue-card:hover { transform: translateY(-6px); box-shadow: 0 24px 48px rgba(0,0,0,0.1); }
        .issue-thumb { position: relative; height: 180px; overflow: hidden; }
        .issue-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
        .issue-card:hover .issue-thumb img { transform: scale(1.05); }
        .issue-thumb::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, rgba(15,23,42,0.35)); }
        .issue-tag { position: absolute; top: 14px; left: 14px; z-index: 2; padding: 5px 14px; border-radius: 999px; font-size: 12px; font-weight: 600; backdrop-filter: blur(6px); }
        .issue-card-body { padding: 24px; }
        .issue-card-body h3 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 10px; line-height: 1.5; }
        .issue-card-body p { font-size: 14px; color: var(--muted); line-height: 1.7; margin-bottom: 18px; }

        /* FAQ手风琴 */
        .faq-wrap { max-width: 860px; margin: 0 auto; }
        .faq-item { background: #fff; border: 1px solid var(--border); border-radius: 14px; margin-bottom: 14px; overflow: hidden; transition: all 0.3s ease; }
        .faq-item:hover { border-color: rgba(99,102,241,0.3); box-shadow: 0 6px 20px rgba(0,0,0,0.04); }
        .faq-question { display: flex; align-items: center; justify-content: space-between; padding: 22px 26px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--dark); transition: background 0.2s; }
        .faq-question:hover { background: #fafbff; }
        .faq-icon { width: 28px; height: 28px; display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; background: rgba(99,102,241,0.1); color: var(--primary); transition: all 0.3s ease; flex-shrink: 0; font-size: 14px; }
        .faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
        .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1); padding: 0 26px; font-size: 15px; color: var(--muted); line-height: 1.8; }
        .faq-item.open .faq-answer { max-height: 600px; padding-bottom: 24px; }

        /* 图文帮助 */
        .help-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
        .help-media { position: relative; border-radius: 24px; overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,0.12); }
        .help-media img { width: 100%; height: 380px; object-fit: cover; }
        .help-media::after { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(99,102,241,0.2), transparent 60%); }
        .help-list { margin-top: 24px; }
        .help-item { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--border); }
        .help-item:last-child { border-bottom: none; }
        .help-item-icon { width: 42px; height: 42px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; border-radius: 12px; background: rgba(16,185,129,0.1); color: var(--secondary); font-size: 18px; }
        .help-item-text h4 { font-size: 16px; font-weight: 600; color: var(--dark); margin-bottom: 4px; }
        .help-item-text p { font-size: 14px; color: var(--muted); }

        /* 流程 */
        .process-section { background: var(--dark); position: relative; overflow: hidden; }
        .process-section .section-title, .process-section .section-desc { color: #fff; }
        .process-section .section-tag { background: rgba(255,255,255,0.1); color: #a5b4fc; }
        .process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
        .process-card { text-align: center; padding: 36px 20px; border-radius: 20px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); transition: all 0.3s ease; }
        .process-card:hover { background: rgba(255,255,255,0.09); transform: translateY(-6px); }
        .process-num { width: 52px; height: 52px; margin: 0 auto 18px; display: flex; align-items: center; justify-content: center; border-radius: 50%; font-size: 20px; font-weight: 800; color: #fff; background: linear-gradient(135deg, #6366f1, #8b5cf6); box-shadow: 0 8px 24px rgba(99,102,241,0.4); }
        .process-card h3 { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 10px; }
        .process-card p { font-size: 14px; color: rgba(255,255,255,0.7); line-height: 1.6; }

        /* CTA */
        .cta-section { position: relative; padding: 90px 0; text-align: center; }
        .cta-bg { position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center/cover no-repeat; }
        .cta-bg::after { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(79,70,229,0.9), rgba(99,102,241,0.78)); }
        .cta-inner { position: relative; z-index: 2; max-width: 720px; margin: 0 auto; }
        .cta-inner h2 { font-size: 36px; font-weight: 800; color: #fff; margin-bottom: 14px; }
        .cta-inner p { font-size: 16px; color: rgba(255,255,255,0.85); margin-bottom: 32px; }
        .cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

        /* Footer */
        .footer { background: var(--dark); color: #94a3b8; padding: 70px 0 30px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 48px; margin-bottom: 48px; }
        .footer-logo { display: inline-block; font-size: 22px; font-weight: 700; color: #fff !important; margin-bottom: 16px; }
        .footer-brand p { font-size: 14px; line-height: 1.8; max-width: 300px; }
        .footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 18px; font-weight: 600; }
        .footer-col a { display: block; color: #94a3b8; font-size: 14px; padding: 5px 0; transition: color 0.2s; }
        .footer-col a:hover { color: #fff; }
        .footer-col p { font-size: 14px; padding: 4px 0; line-height: 1.6; }
        .footer-col i { margin-right: 8px; color: #6366f1; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 28px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: 13px; }

        /* 移动端底部Tab */
        .mobile-tabnav { display: none; }

        @media (max-width: 1024px) {
            .desktop-nav { display: none; }
            .header-cta { display: none; }
            .header-inner { justify-content: space-between; }
            .mobile-tabnav { display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 100; background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); border-top: 1px solid var(--border); padding: 6px 4px calc(6px + env(safe-area-inset-bottom)); justify-content: space-around; box-shadow: 0 -4px 20px rgba(0,0,0,0.04); }
            .mobile-tabnav a { display: flex; flex-direction: column; align-items: center; gap: 3px; padding: 7px 16px; border-radius: 12px; font-size: 11px; color: var(--muted); transition: all 0.2s; }
            .mobile-tabnav a i { font-size: 18px; }
            .mobile-tabnav a.active { color: var(--primary); font-weight: 600; }
            .mobile-tabnav a span { font-size: 11px; }
            body { padding-bottom: 68px; }
            .pill-grid { grid-template-columns: repeat(2, 1fr); }
            .issue-grid { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: repeat(2, 1fr); }
            .help-grid { grid-template-columns: 1fr; gap: 40px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .hero-title { font-size: 38px; }
        }

        @media (max-width: 640px) {
            .section-pad { padding: 56px 0; }
            .hero-title { font-size: 30px; }
            .hero-subtitle { font-size: 16px; }
            .faq-hero { padding: 64px 0 56px; }
            .search-box { flex-direction: column; align-items: stretch; padding: 12px; gap: 8px; }
            .search-box input { padding: 10px 12px; width: 100%; border-radius: 10px; background: rgba(255,255,255,0.1); }
            .search-box button { width: 100%; }
            .pill-grid { grid-template-columns: 1fr; gap: 14px; margin-top: -20px; }
            .issue-grid { grid-template-columns: 1fr; }
            .process-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .section-title { font-size: 28px; }
            .cta-inner h2 { font-size: 28px; }
            .faq-question { padding: 18px 18px; font-size: 14px; }
            .faq-answer { padding: 0 18px; font-size: 14px; }
            .faq-item.open .faq-answer { padding: 0 18px 20px; }
            .help-media img { height: 260px; }
        }