/* roulang page: index */
/* ===== Design Variables ===== */
:root {
  --primary: #0f172a;
  --primary-light: #1e293b;
  --secondary: #3b82f6;
  --secondary-hover: #2563eb;
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --bg-dark: #0f172a;
  --card-bg: #ffffff;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-light: #e2e8f0;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(15,23,42,0.06);
  --shadow: 0 4px 12px rgba(15,23,42,0.08);
  --shadow-lg: 0 12px 40px rgba(15,23,42,0.12);
  --shadow-xl: 0 20px 60px rgba(15,23,42,0.16);
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --container: 1200px;
  --header-h: 72px;
}
/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;}
body{font-family:var(--font-sans);font-size:16px;line-height:1.6;color:var(--text);background:var(--bg);}
a{color:var(--secondary);text-decoration:none;transition:color var(--transition);}
a:hover{color:var(--secondary-hover);}
img{max-width:100%;height:auto;display:block;}
button,input,textarea,select{font-family:inherit;font-size:inherit;background:none;border:none;outline:none;color:inherit;}
button{cursor:pointer;}
ul,ol{list-style:none;}
h1,h2,h3,h4,h5,h6{line-height:1.25;font-weight:600;color:var(--text);}
h1{font-size:clamp(2rem,5vw,3.2rem);letter-spacing:-0.02em;}
h2{font-size:clamp(1.5rem,3.5vw,2.25rem);letter-spacing:-0.015em;}
h3{font-size:clamp(1.1rem,2vw,1.5rem);}
h4{font-size:1.125rem;}
p{color:var(--text-secondary);margin-bottom:0.75rem;}
/* ===== Container ===== */
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}
.container-narrow{max-width:880px;margin:0 auto;padding:0 24px;}
/* ===== Section Spacing ===== */
.section{padding:80px 0;}
.section-alt{background:var(--bg-alt);}
.section-dark{background:var(--bg-dark);color:var(--text-light);}
.section-dark h2,.section-dark h3,.section-dark .section-title{color:#fff;}
.section-dark p{color:var(--text-muted);}
.section-title{text-align:center;margin-bottom:12px;}
.section-subtitle{text-align:center;font-size:1.1rem;color:var(--text-secondary);max-width:640px;margin:0 auto 48px;}
.section-dark .section-subtitle{color:var(--text-muted);}
/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius);font-weight:500;font-size:1rem;line-height:1.4;transition:all var(--transition);border:2px solid transparent;}
.btn-primary{background:var(--secondary);color:#fff;border-color:var(--secondary);}
.btn-primary:hover{background:var(--secondary-hover);border-color:var(--secondary-hover);color:#fff;transform:translateY(-2px);box-shadow:0 8px 24px rgba(59,130,246,0.35);}
.btn-primary:active{transform:translateY(0);}
.btn-outline{background:transparent;color:var(--secondary);border-color:var(--secondary);}
.btn-outline:hover{background:var(--secondary);color:#fff;border-color:var(--secondary);transform:translateY(-2px);}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,0.4);}
.btn-outline-light:hover{background:rgba(255,255,255,0.1);border-color:#fff;color:#fff;transform:translateY(-2px);}
.btn-lg{padding:16px 36px;font-size:1.1rem;border-radius:var(--radius-lg);}
.btn-sm{padding:8px 18px;font-size:0.875rem;border-radius:var(--radius-sm);}
/* ===== Badges & Tags ===== */
.badge{display:inline-flex;align-items:center;gap:4px;padding:4px 12px;border-radius:100px;font-size:0.8rem;font-weight:500;background:var(--bg-alt);color:var(--text-secondary);}
.badge-primary{background:rgba(59,130,246,0.12);color:var(--secondary);}
.badge-accent{background:rgba(6,182,212,0.12);color:var(--accent);}
.tag{display:inline-block;padding:3px 12px;border-radius:100px;font-size:0.75rem;font-weight:500;background:var(--border);color:var(--text-secondary);transition:all var(--transition);}
.tag:hover{background:var(--secondary);color:#fff;}
/* ===== Cards ===== */
.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);transition:all var(--transition);overflow:hidden;}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);}
.card-img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.card-body{padding:24px;}
.card-title{font-size:1.15rem;font-weight:600;margin-bottom:8px;color:var(--text);}
.card-text{font-size:0.95rem;color:var(--text-secondary);margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card-meta{display:flex;align-items:center;gap:12px;font-size:0.85rem;color:var(--text-muted);}
/* ===== Header & Nav ===== */
.site-header{position:sticky;top:0;z-index:100;background:rgba(15,23,42,0.98);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,0.06);height:var(--header-h);}
.header-inner{display:flex;align-items:center;height:var(--header-h);gap:16px;}
.logo{flex-shrink:0;}
.logo a{font-size:1.35rem;font-weight:700;color:#fff;letter-spacing:-0.02em;display:flex;align-items:center;gap:8px;}
.logo a:hover{color:var(--accent-light);}
.logo a i{color:var(--accent);font-size:1.5rem;}
/* Search Bar */
.search-bar{flex:1;max-width:480px;margin:0 16px;position:relative;}
.search-bar form{display:flex;align-items:center;background:rgba(255,255,255,0.1);border-radius:100px;border:1px solid rgba(255,255,255,0.12);transition:all var(--transition);}
.search-bar form:focus-within{background:rgba(255,255,255,0.18);border-color:var(--accent);box-shadow:0 0 0 3px rgba(6,182,212,0.2);}
.search-bar input{flex:1;padding:10px 18px;background:transparent;color:#fff;font-size:0.95rem;min-width:0;}
.search-bar input::placeholder{color:var(--text-muted);}
.search-bar button{padding:10px 18px;color:var(--text-muted);transition:color var(--transition);flex-shrink:0;}
.search-bar button:hover{color:var(--accent);}
/* Main Nav */
.main-nav{flex-shrink:0;display:flex;align-items:center;gap:4px;}
.main-nav ul{display:flex;align-items:center;gap:2px;}
.main-nav a{display:flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius-sm);font-size:0.9rem;font-weight:500;color:var(--text-muted);transition:all var(--transition);white-space:nowrap;}
.main-nav a i{font-size:0.9rem;}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,0.08);}
.main-nav a.active{color:#fff;background:rgba(59,130,246,0.2);}
.mobile-toggle{display:none;flex-shrink:0;width:40px;height:40px;align-items:center;justify-content:center;color:var(--text-muted);font-size:1.3rem;border-radius:var(--radius-sm);transition:all var(--transition);}
.mobile-toggle:hover{background:rgba(255,255,255,0.08);color:#fff;}
/* ===== Hero ===== */
.hero{position:relative;padding:100px 0 80px;background:var(--bg-dark);overflow:hidden;min-height:70vh;display:flex;align-items:center;}
.hero-bg{position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') center center/cover no-repeat;opacity:0.35;z-index:0;}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,23,42,0.92) 30%,rgba(15,23,42,0.6) 70%,rgba(6,182,212,0.15) 100%);z-index:1;}
.hero .container{position:relative;z-index:2;}
.hero-content{max-width:720px;}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;background:rgba(6,182,212,0.15);border:1px solid rgba(6,182,212,0.3);border-radius:100px;font-size:0.85rem;color:var(--accent-light);margin-bottom:20px;}
.hero-badge i{font-size:0.8rem;}
.hero h1{color:#fff;margin-bottom:16px;font-weight:700;}
.hero p{font-size:1.15rem;color:var(--text-muted);margin-bottom:32px;max-width:600px;line-height:1.7;}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:40px;}
.hero-stats{display:flex;flex-wrap:wrap;gap:32px;padding-top:32px;border-top:1px solid rgba(255,255,255,0.08);}
.hero-stat{text-align:left;}
.hero-stat-num{font-size:1.8rem;font-weight:700;color:#fff;line-height:1.2;}
.hero-stat-label{font-size:0.85rem;color:var(--text-muted);margin-top:2px;}
/* ===== Features ===== */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.feature-card{background:var(--card-bg);border-radius:var(--radius);padding:36px 28px;box-shadow:var(--shadow);transition:all var(--transition);text-align:center;border:1px solid transparent;}
.feature-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-6px);border-color:rgba(59,130,246,0.15);}
.feature-icon{width:60px;height:60px;border-radius:var(--radius);background:rgba(59,130,246,0.1);color:var(--secondary);display:flex;align-items:center;justify-content:center;font-size:1.6rem;margin:0 auto 20px;transition:all var(--transition);}
.feature-card:hover .feature-icon{background:var(--secondary);color:#fff;}
.feature-card h3{margin-bottom:10px;font-size:1.2rem;}
.feature-card p{font-size:0.95rem;margin-bottom:0;}
/* ===== Category Section ===== */
.category-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.category-card{display:flex;align-items:center;gap:24px;background:var(--card-bg);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:all var(--transition);border:1px solid transparent;}
.category-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);border-color:rgba(59,130,246,0.12);}
.category-img{width:120px;height:90px;border-radius:var(--radius-sm);object-fit:cover;flex-shrink:0;}
.category-info{flex:1;}
.category-info h3{font-size:1.1rem;margin-bottom:4px;}
.category-info p{font-size:0.9rem;color:var(--text-secondary);margin-bottom:8px;}
.category-info .tag{font-size:0.75rem;}
/* ===== Posts List ===== */
.posts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.post-card{background:var(--card-bg);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:all var(--transition);}
.post-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);}
.post-card-img{width:100%;aspect-ratio:16/10;object-fit:cover;display:block;}
.post-card-body{padding:20px;}
.post-card-category{font-size:0.8rem;color:var(--secondary);font-weight:500;margin-bottom:6px;}
.post-card-title{font-size:1.05rem;font-weight:600;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.post-card-title a{color:var(--text);transition:color var(--transition);}
.post-card-title a:hover{color:var(--secondary);}
.post-card-excerpt{font-size:0.9rem;color:var(--text-secondary);margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.post-card-meta{display:flex;align-items:center;gap:12px;font-size:0.8rem;color:var(--text-muted);}
.post-card-meta i{font-size:0.75rem;}
.empty-posts{padding:48px 24px;text-align:center;color:var(--text-muted);font-size:1.05rem;background:var(--card-bg);border-radius:var(--radius);border:1px dashed var(--border);}
/* ===== Stats / Data ===== */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.stat-item{text-align:center;padding:32px 16px;background:rgba(255,255,255,0.04);border-radius:var(--radius);border:1px solid rgba(255,255,255,0.06);transition:all var(--transition);}
.stat-item:hover{background:rgba(255,255,255,0.07);transform:translateY(-2px);}
.stat-item-num{font-size:2.4rem;font-weight:700;color:#fff;line-height:1.2;margin-bottom:4px;}
.stat-item-label{font-size:0.9rem;color:var(--text-muted);}
/* ===== Steps ===== */
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step;}
.step-card{text-align:center;padding:36px 20px;background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);position:relative;transition:all var(--transition);}
.step-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);}
.step-number{width:48px;height:48px;border-radius:50%;background:var(--secondary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;margin:0 auto 16px;position:relative;z-index:1;}
.step-card h3{font-size:1.05rem;margin-bottom:8px;}
.step-card p{font-size:0.9rem;color:var(--text-secondary);margin-bottom:0;}
.step-connector{display:none;}
/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto;}
.faq-item{border-bottom:1px solid var(--border);padding:20px 0;}
.faq-item:first-child{padding-top:0;}
.faq-question{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;text-align:left;font-size:1.05rem;font-weight:500;color:var(--text);padding:4px 0;transition:color var(--transition);}
.faq-question:hover{color:var(--secondary);}
.faq-question i{font-size:0.9rem;color:var(--text-muted);transition:transform var(--transition);flex-shrink:0;}
.faq-item.active .faq-question i{transform:rotate(180deg);color:var(--secondary);}
.faq-answer{padding-top:12px;display:none;font-size:0.95rem;color:var(--text-secondary);line-height:1.7;}
.faq-item.active .faq-answer{display:block;}
.faq-answer p:last-child{margin-bottom:0;}
/* ===== CTA ===== */
.cta-section{background:linear-gradient(135deg,var(--primary) 0%,#1a2d4a 100%);border-radius:var(--radius-xl);padding:64px 48px;text-align:center;margin:0 24px;}
.cta-section h2{color:#fff;font-size:clamp(1.5rem,3vw,2.2rem);margin-bottom:12px;}
.cta-section p{color:var(--text-muted);max-width:560px;margin:0 auto 32px;font-size:1.05rem;}
.cta-section .btn-primary{background:var(--accent);border-color:var(--accent);}
.cta-section .btn-primary:hover{background:var(--accent-light);border-color:var(--accent-light);box-shadow:0 8px 24px rgba(6,182,212,0.35);}
/* ===== Footer ===== */
.site-footer{background:var(--primary);border-top:1px solid rgba(255,255,255,0.06);padding:48px 0 24px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:32px;}
.footer-brand .logo a{font-size:1.2rem;color:#fff;}
.footer-brand p{font-size:0.9rem;color:var(--text-muted);margin-top:12px;max-width:320px;}
.footer-col h4{color:#fff;font-size:0.95rem;font-weight:600;margin-bottom:16px;}
.footer-col ul li{margin-bottom:8px;}
.footer-col ul a{color:var(--text-muted);font-size:0.9rem;transition:color var(--transition);}
.footer-col ul a:hover{color:var(--accent-light);}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.06);padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;}
.footer-bottom p{font-size:0.85rem;color:var(--text-muted);margin-bottom:0;}
.footer-bottom-links{display:flex;gap:20px;}
.footer-bottom-links a{font-size:0.85rem;color:var(--text-muted);transition:color var(--transition);}
.footer-bottom-links a:hover{color:var(--accent-light);}
/* ===== Responsive ===== */
@media(max-width:1200px){
  .container{padding:0 20px;}
  .posts-grid{grid-template-columns:repeat(2,1fr);}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:16px;}
}
@media(max-width:1024px){
  .features-grid{grid-template-columns:repeat(2,1fr);}
  .steps-grid{grid-template-columns:repeat(2,1fr);gap:20px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .search-bar{max-width:320px;}
}
@media(max-width:768px){
  :root{--header-h:64px;}
  .section{padding:56px 0;}
  .hero{padding:72px 0 56px;min-height:auto;}
  .hero h1{font-size:1.8rem;}
  .hero p{font-size:1rem;margin-bottom:24px;}
  .hero-stats{gap:20px;padding-top:24px;}
  .hero-stat-num{font-size:1.5rem;}
  .features-grid{grid-template-columns:1fr 1fr;gap:16px;}
  .feature-card{padding:24px 16px;}
  .category-grid{grid-template-columns:1fr;gap:16px;}
  .category-card{padding:16px;}
  .category-img{width:100px;height:72px;}
  .posts-grid{grid-template-columns:1fr 1fr;gap:16px;}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
  .stat-item{padding:20px 12px;}
  .stat-item-num{font-size:1.8rem;}
  .steps-grid{grid-template-columns:1fr 1fr;gap:16px;}
  .step-card{padding:24px 16px;}
  .cta-section{padding:40px 24px;margin:0 16px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px;}
  .search-bar{max-width:240px;}
  .main-nav a{padding:8px 12px;font-size:0.85rem;}
}
@media(max-width:640px){
  .search-bar form{background:rgba(255,255,255,0.08);}
  .search-bar input{padding:8px 14px;font-size:0.9rem;}
  .search-bar button{padding:8px 12px;}
  .main-nav ul{gap:0;}
  .main-nav a{padding:6px 10px;font-size:0.8rem;}
  .features-grid{grid-template-columns:1fr;max-width:400px;margin:0 auto;}
  .posts-grid{grid-template-columns:1fr;max-width:480px;margin:0 auto;}
  .steps-grid{grid-template-columns:1fr;max-width:360px;margin:0 auto;}
  .stats-grid{grid-template-columns:1fr 1fr;}
  .footer-grid{grid-template-columns:1fr;text-align:center;}
  .footer-brand p{margin:12px auto 0;}
  .footer-bottom{flex-direction:column;text-align:center;}
}
@media(max-width:520px){
  .hero h1{font-size:1.5rem;}
  .hero p{font-size:0.95rem;}
  .hero-actions{gap:12px;}
  .hero-actions .btn{padding:10px 20px;font-size:0.9rem;width:100%;justify-content:center;}
  .hero-stats{flex-direction:column;gap:12px;}
  .hero-stat{display:flex;align-items:center;gap:12px;}
  .main-nav{position:fixed;top:var(--header-h);left:0;right:0;background:rgba(15,23,42,0.99);backdrop-filter:blur(12px);flex-direction:column;padding:16px 20px;border-bottom:1px solid rgba(255,255,255,0.06);display:none;box-shadow:var(--shadow-xl);}
  .main-nav.open{display:flex;}
  .main-nav ul{flex-direction:column;width:100%;gap:0;}
  .main-nav a{padding:12px 16px;width:100%;border-radius:var(--radius-sm);}
  .mobile-toggle{display:flex;}
  .search-bar{flex:1;max-width:none;margin:0 8px;}
  .header-inner{gap:8px;}
  .section-title{font-size:1.4rem;}
  .section-subtitle{font-size:0.95rem;margin-bottom:28px;}
  .cta-section{padding:32px 20px;}
  .cta-section h2{font-size:1.3rem;}
  .cta-section p{font-size:0.9rem;}
  .stats-grid{grid-template-columns:1fr 1fr;gap:10px;}
  .stat-item-num{font-size:1.5rem;}
}

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --primary-bg: #eff6ff;
            --secondary: #7c3aed;
            --secondary-light: #8b5cf6;
            --accent: #f59e0b;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-gray: #f1f5f9;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f8fafc;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary); }
        ul, ol { list-style: none; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: 1rem; outline: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.25rem; }
        p { margin-bottom: 1em; }
        .container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 12px 28px; border-radius: var(--radius-md);
            font-weight: 600; font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
        }
        .btn-primary {
            background: var(--primary); color: #fff;
            box-shadow: 0 4px 14px rgba(37,99,235,0.35);
        }
        .btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(37,99,235,0.4); }
        .btn-primary:active { transform: translateY(0); }
        .btn-outline {
            background: transparent; color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .btn-outline:active { transform: translateY(0); }
        .btn-light {
            background: var(--bg-white); color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .btn-light:hover { background: var(--primary); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; border-radius: var(--radius-sm); }
        .btn-lg { padding: 16px 36px; font-size: 1.1rem; }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block; padding: 4px 14px;
            border-radius: 100px; font-size: 0.8rem; font-weight: 600;
            background: var(--primary-bg); color: var(--primary);
        }
        .badge-secondary { background: #f3e8ff; color: var(--secondary); }
        .badge-accent { background: #fef3c7; color: #b45309; }
        .tag {
            display: inline-block; padding: 4px 12px;
            border-radius: var(--radius-sm); font-size: 0.78rem;
            background: var(--bg-gray); color: var(--text-light);
            transition: all var(--transition);
        }
        .tag:hover { background: var(--primary-bg); color: var(--primary); }

        /* ===== Header & Nav ===== */
        .site-header {
            position: sticky; top: 0; z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--nav-height);
        }
        .site-header .container {
            display: flex; align-items: center;
            height: 100%; gap: 32px;
        }
        .logo a {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.35rem; font-weight: 800;
            color: var(--text); letter-spacing: -0.5px;
        }
        .logo a i { color: var(--primary); font-size: 1.5rem; }
        .logo a:hover { color: var(--primary); }

        .main-nav { flex: 1; display: flex; justify-content: center; }
        .main-nav ul { display: flex; align-items: center; gap: 8px; }
        .main-nav ul li a {
            display: flex; align-items: center; gap: 6px;
            padding: 8px 16px; border-radius: var(--radius-sm);
            font-weight: 500; font-size: 0.92rem;
            color: var(--text-light); transition: all var(--transition);
        }
        .main-nav ul li a i { font-size: 0.85rem; }
        .main-nav ul li a:hover { background: var(--bg-gray); color: var(--text); }
        .main-nav ul li a.active {
            background: var(--primary-bg); color: var(--primary);
            font-weight: 600;
        }

        .nav-actions { display: flex; align-items: center; gap: 12px; }
        .search-box {
            display: flex; align-items: center;
            background: var(--bg-gray); border-radius: 100px;
            padding: 0 16px; border: 2px solid transparent;
            transition: all var(--transition);
        }
        .search-box:focus-within { border-color: var(--primary); background: var(--bg-white); }
        .search-box i { color: var(--text-light); font-size: 0.9rem; }
        .search-box input {
            border: none; background: transparent;
            padding: 8px 10px; width: 140px;
            font-size: 0.88rem; color: var(--text);
        }
        .search-box input::placeholder { color: var(--text-muted); }

        .nav-toggle { display: none; font-size: 1.5rem; color: var(--text); padding: 4px; }

        /* ===== Hero Banner (Article) ===== */
        .article-hero {
            position: relative;
            padding: 80px 0 60px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: var(--text-white);
            overflow: hidden;
        }
        .article-hero::before {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(30,27,75,0.7) 100%);
        }
        .article-hero .container { position: relative; z-index: 2; }
        .article-hero .breadcrumb {
            display: flex; align-items: center; gap: 8px;
            font-size: 0.85rem; color: rgba(255,255,255,0.7);
            margin-bottom: 24px;
        }
        .article-hero .breadcrumb a { color: rgba(255,255,255,0.7); }
        .article-hero .breadcrumb a:hover { color: #fff; }
        .article-hero .breadcrumb span { color: rgba(255,255,255,0.5); }
        .article-hero .breadcrumb i { font-size: 0.75rem; }
        .article-hero .hero-category {
            display: inline-block; padding: 6px 18px;
            border-radius: 100px; font-size: 0.82rem; font-weight: 600;
            background: rgba(255,255,255,0.15); color: #fff;
            backdrop-filter: blur(4px); margin-bottom: 16px;
        }
        .article-hero h1 {
            font-size: 3rem; font-weight: 800;
            color: #fff; max-width: 900px;
            line-height: 1.15; margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .article-hero .hero-meta {
            display: flex; flex-wrap: wrap; align-items: center; gap: 20px;
            font-size: 0.9rem; color: rgba(255,255,255,0.75);
        }
        .article-hero .hero-meta i { margin-right: 6px; }
        .article-hero .hero-meta span { display: flex; align-items: center; }

        /* ===== Article Main ===== */
        .article-main { padding: 60px 0 80px; }
        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 300px;
            gap: 48px;
        }
        .article-body { min-width: 0; }
        .article-body .featured-image {
            border-radius: var(--radius-lg);
            overflow: hidden; margin-bottom: 36px;
            box-shadow: var(--shadow-md);
        }
        .article-body .featured-image img { width: 100%; height: auto; display: block; }
        .article-body .content {
            font-size: 1.05rem; line-height: 1.85;
            color: var(--text);
        }
        .article-body .content h2, .article-body .content h3 {
            margin-top: 1.8em; margin-bottom: 0.6em;
        }
        .article-body .content p { margin-bottom: 1.2em; }
        .article-body .content ul, .article-body .content ol {
            margin-bottom: 1.2em; padding-left: 1.5em;
        }
        .article-body .content ul { list-style: disc; }
        .article-body .content ol { list-style: decimal; }
        .article-body .content li { margin-bottom: 0.4em; }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 24px; margin: 1.5em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
        }
        .article-body .content a { color: var(--primary); text-decoration: underline; }
        .article-body .content a:hover { color: var(--primary-dark); }
        .article-body .content img { border-radius: var(--radius-md); margin: 1.5em 0; }

        .article-tags {
            display: flex; flex-wrap: wrap; gap: 8px;
            margin-top: 40px; padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .article-tags .tag { font-size: 0.82rem; }

        .article-nav {
            display: flex; justify-content: space-between;
            gap: 24px; margin-top: 48px;
            padding-top: 32px; border-top: 1px solid var(--border);
        }
        .article-nav a {
            flex: 1; padding: 20px 24px;
            background: var(--bg-card); border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex; flex-direction: column; gap: 6px;
        }
        .article-nav a:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
        .article-nav .nav-label { font-size: 0.8rem; color: var(--text-muted); }
        .article-nav .nav-title { font-weight: 600; color: var(--text); font-size: 0.95rem; }
        .article-nav .next { text-align: right; }

        /* ===== Sidebar ===== */
        .article-sidebar { position: sticky; top: calc(var(--nav-height) + 32px); align-self: start; }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 24px; margin-bottom: 24px;
        }
        .sidebar-card h4 {
            font-size: 1rem; font-weight: 700;
            margin-bottom: 16px; padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-bg);
        }
        .sidebar-card ul li { margin-bottom: 10px; }
        .sidebar-card ul li a {
            font-size: 0.9rem; color: var(--text-light);
            display: flex; align-items: center; gap: 8px;
            padding: 6px 0; transition: all var(--transition);
        }
        .sidebar-card ul li a:hover { color: var(--primary); padding-left: 4px; }
        .sidebar-card ul li a i { color: var(--primary); font-size: 0.75rem; width: 16px; }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            padding: 28px 24px; border-radius: var(--radius-md);
            color: #fff; text-align: center;
        }
        .sidebar-cta h4 { color: #fff; border-bottom-color: rgba(255,255,255,0.2); }
        .sidebar-cta p { font-size: 0.9rem; opacity: 0.9; margin-bottom: 16px; }
        .sidebar-cta .btn { background: #fff; color: var(--primary); }
        .sidebar-cta .btn:hover { background: var(--bg-gray); transform: translateY(-2px); }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 60px 0; background: var(--bg-white);
            border-top: 1px solid var(--border);
        }
        .related-section .section-title {
            text-align: center; margin-bottom: 40px;
        }
        .related-section .section-title h2 { font-size: 1.8rem; }
        .related-section .section-title p { color: var(--text-light); max-width: 600px; margin: 8px auto 0; }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
        .related-card .card-img {
            width: 100%; height: 180px; object-fit: cover;
            background: var(--bg-gray);
        }
        .related-card .card-body { padding: 20px; }
        .related-card .card-body .badge { margin-bottom: 10px; }
        .related-card .card-body h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
        .related-card .card-body h3 a { color: var(--text); }
        .related-card .card-body h3 a:hover { color: var(--primary); }
        .related-card .card-body p { font-size: 0.88rem; color: var(--text-light); margin-bottom: 0; }
        .related-card .card-footer {
            padding: 12px 20px; border-top: 1px solid var(--border);
            font-size: 0.82rem; color: var(--text-muted);
            display: flex; justify-content: space-between;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(30,27,75,0.75) 100%);
        }
        .cta-section .container { position: relative; z-index: 2; text-align: center; }
        .cta-section h2 { color: #fff; font-size: 2rem; margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto 32px; font-size: 1.05rem; }
        .cta-section .btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark); color: rgba(255,255,255,0.7);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px; padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo a { color: #fff; font-size: 1.3rem; margin-bottom: 16px; display: inline-flex; }
        .footer-brand .logo a i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; margin-top: 12px; max-width: 340px; }
        .footer-col h4 {
            color: #fff; font-size: 0.95rem; font-weight: 700;
            margin-bottom: 18px; letter-spacing: 0.3px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: rgba(255,255,255,0.6); font-size: 0.88rem;
            transition: all var(--transition); display: inline-flex; align-items: center; gap: 8px;
        }
        .footer-col ul li a:hover { color: #fff; padding-left: 4px; }
        .footer-col ul li a i { width: 16px; color: var(--primary-light); font-size: 0.85rem; }
        .footer-bottom {
            display: flex; justify-content: space-between; align-items: center;
            padding: 24px 0; flex-wrap: wrap; gap: 12px;
            font-size: 0.82rem; color: rgba(255,255,255,0.4);
        }
        .footer-bottom-links { display: flex; gap: 20px; }
        .footer-bottom-links a { color: rgba(255,255,255,0.4); }
        .footer-bottom-links a:hover { color: #fff; }

        /* ===== Error State ===== */
        .error-state {
            text-align: center; padding: 80px 24px;
        }
        .error-state i { font-size: 4rem; color: var(--text-muted); margin-bottom: 24px; display: block; }
        .error-state h2 { font-size: 2rem; margin-bottom: 12px; }
        .error-state p { color: var(--text-light); max-width: 500px; margin: 0 auto 24px; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; position: static; }
            .sidebar-card { margin-bottom: 0; }
            .sidebar-cta { grid-column: 1 / -1; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }

        @media (max-width: 768px) {
            :root { --nav-height: 64px; }
            .site-header .container { gap: 16px; }
            .main-nav { display: none; }
            .main-nav.open { display: flex; position: absolute; top: var(--nav-height); left: 0; right: 0;
                background: var(--bg-white); border-bottom: 1px solid var(--border);
                padding: 16px 24px; flex-direction: column; box-shadow: var(--shadow-lg); }
            .main-nav.open ul { flex-direction: column; gap: 4px; width: 100%; }
            .main-nav.open ul li a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
            .nav-toggle { display: block; }
            .search-box input { width: 100px; }

            .article-hero { padding: 48px 0 40px; }
            .article-hero h1 { font-size: 2rem; }
            .article-hero .hero-meta { gap: 12px; font-size: 0.82rem; }

            .article-main { padding: 40px 0 60px; }
            .article-body .content { font-size: 0.98rem; }
            .article-nav { flex-direction: column; gap: 12px; }
            .article-nav .next { text-align: left; }

            .article-sidebar { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section { padding: 60px 0; }
            .cta-section h2 { font-size: 1.5rem; }
            .btn-group { flex-direction: column; align-items: center; }
        }

        @media (max-width: 520px) {
            .article-hero h1 { font-size: 1.6rem; }
            .hero-meta { flex-direction: column; align-items: flex-start; gap: 8px; }
            .search-box { display: none; }
            .nav-actions .btn { padding: 8px 14px; font-size: 0.82rem; }
            .related-card .card-img { height: 140px; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --secondary-light: #1e293b;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }

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

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

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

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

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.30);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.20);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-light);
            border-color: var(--accent-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.30);
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 17px;
            border-radius: var(--radius-lg);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }
        @media (max-width: 520px) {
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 15px;
            }
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            background: var(--primary-bg);
            color: var(--primary);
            border: 1px solid rgba(37, 99, 235, 0.15);
            transition: all var(--transition);
        }
        .badge-accent {
            background: #fef3c7;
            color: #b45309;
            border-color: rgba(245, 158, 11, 0.20);
        }
        .badge-green {
            background: #ecfdf5;
            color: #047857;
            border-color: rgba(4, 120, 87, 0.15);
        }
        .badge-purple {
            background: #f5f3ff;
            color: #7c3aed;
            border-color: rgba(124, 58, 237, 0.15);
        }

        /* ===== 分隔线 ===== */
        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--primary);
            border-radius: 4px;
            margin: 12px 0 24px 0;
        }
        .section-divider.center {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 板块标题 ===== */
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--secondary);
            margin-bottom: 8px;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.7;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-divider {
            margin: 12px auto 20px auto;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 26px;
            }
            .section-subtitle {
                font-size: 15px;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }
        @media (max-width: 520px) {
            .section-title {
                font-size: 22px;
            }
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 28px 24px;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(37, 99, 235, 0.15);
        }
        .card-img {
            border-radius: var(--radius-sm);
            overflow: hidden;
            margin: -28px -24px 20px -24px;
        }
        .card-img img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img img {
            transform: scale(1.05);
        }
        .card-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--secondary);
        }
        .card-text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: 12px;
        }
        @media (max-width: 520px) {
            .card {
                padding: 20px 16px;
            }
            .card-img {
                margin: -20px -16px 16px -16px;
            }
            .card-img img {
                height: 160px;
            }
        }

        /* ===== 网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 768px) {
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        /* ===== 板块间距 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
        }
        @media (max-width: 520px) {
            .section {
                padding: 40px 0;
            }
        }

        /* ===== Header & 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            width: 100%;
        }
        .logo {
            flex-shrink: 0;
        }
        .logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--secondary);
            text-decoration: none;
        }
        .logo a i {
            font-size: 26px;
            color: var(--primary);
        }
        .logo a:hover {
            color: var(--primary);
        }

        /* 搜索框 */
        .search-wrap {
            flex: 1;
            max-width: 480px;
            margin: 0 12px;
        }
        .search-form {
            display: flex;
            align-items: center;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: 100px;
            padding: 0 6px 0 18px;
            transition: all var(--transition);
        }
        .search-form:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.10);
            background: #fff;
        }
        .search-form input {
            flex: 1;
            background: transparent;
            padding: 10px 0;
            font-size: 14px;
            color: var(--text);
            min-width: 0;
        }
        .search-form input::placeholder {
            color: var(--text-light);
        }
        .search-form button {
            flex-shrink: 0;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background var(--transition);
            font-size: 14px;
        }
        .search-form button:hover {
            background: var(--primary-dark);
        }

        /* 主导航 */
        .main-nav ul {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav ul li a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 16px;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .main-nav ul li a i {
            font-size: 14px;
        }
        .main-nav ul li a:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .main-nav ul li a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        .main-nav ul li a.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }

        /* 移动端汉堡 */
        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            color: var(--secondary);
            font-size: 20px;
            align-items: center;
            justify-content: center;
            transition: background var(--transition);
            flex-shrink: 0;
        }
        .nav-toggle:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }

        @media (max-width: 1024px) {
            .search-wrap {
                max-width: 320px;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                gap: 8px;
            }
            .search-wrap {
                display: none;
            }
            .main-nav {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                border-bottom: 1px solid var(--border);
                padding: 16px 24px;
                transform: translateY(-110%);
                opacity: 0;
                visibility: hidden;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 6px;
            }
            .main-nav ul li a {
                padding: 12px 16px;
                font-size: 16px;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .nav-toggle {
                display: flex;
            }
            /* 移动端搜索框显示在导航内 */
            .main-nav .mobile-search {
                display: block;
                margin-bottom: 12px;
            }
            .main-nav .mobile-search .search-form {
                border-radius: var(--radius-sm);
                padding: 0 4px 0 14px;
            }
            .main-nav .mobile-search .search-form input {
                padding: 12px 0;
                font-size: 15px;
            }
        }
        @media (min-width: 769px) {
            .main-nav .mobile-search {
                display: none;
            }
        }
        @media (max-width: 520px) {
            .logo a {
                font-size: 18px;
            }
            .logo a i {
                font-size: 20px;
            }
            .main-nav {
                padding: 12px 16px;
            }
        }

        /* ===== Hero 区域 ===== */
        .hero {
            position: relative;
            padding: 100px 0 80px;
            background: var(--secondary);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 41, 59, 0.72) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .hero-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
        }
        .hero-breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition);
        }
        .hero-breadcrumb a:hover {
            color: #fff;
        }
        .hero-breadcrumb span {
            color: rgba(255, 255, 255, 0.4);
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(37, 99, 235, 0.20);
            color: var(--accent-light);
            border: 1px solid rgba(255, 255, 255, 0.10);
            margin-bottom: 16px;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: 44px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            max-width: 720px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        @media (max-width: 768px) {
            .hero {
                padding: 72px 0 52px;
                min-height: 340px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .hero p {
                font-size: 16px;
            }
        }
        @media (max-width: 520px) {
            .hero {
                padding: 56px 0 40px;
                min-height: 280px;
            }
            .hero h1 {
                font-size: 26px;
            }
            .hero p {
                font-size: 14px;
            }
            .hero-actions {
                flex-direction: column;
                gap: 10px;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== 指南概览 ===== */
        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .overview-content h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .overview-content p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .overview-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .stat-item {
            text-align: center;
            padding: 24px 12px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 6px;
        }
        @media (max-width: 768px) {
            .overview-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .overview-content h2 {
                font-size: 24px;
            }
            .overview-stats {
                grid-template-columns: repeat(3, 1fr);
                gap: 12px;
            }
            .stat-number {
                font-size: 28px;
            }
        }
        @media (max-width: 520px) {
            .overview-stats {
                grid-template-columns: repeat(3, 1fr);
                gap: 8px;
            }
            .stat-item {
                padding: 16px 8px;
            }
            .stat-number {
                font-size: 22px;
            }
            .stat-label {
                font-size: 12px;
            }
        }

        /* ===== 主题分类卡片 ===== */
        .topic-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
        }
        .topic-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(37, 99, 235, 0.15);
        }
        .topic-card .card-img-top {
            height: 180px;
            overflow: hidden;
        }
        .topic-card .card-img-top img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .topic-card:hover .card-img-top img {
            transform: scale(1.06);
        }
        .topic-card-body {
            padding: 24px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .topic-card-body .badge {
            align-self: flex-start;
            margin-bottom: 10px;
        }
        .topic-card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .topic-card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }
        .topic-card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
            font-size: 13px;
            color: var(--text-light);
        }
        .topic-card-footer a {
            font-weight: 600;
            font-size: 13px;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        @media (max-width: 768px) {
            .topic-card .card-img-top {
                height: 150px;
            }
            .topic-card-body {
                padding: 18px 16px 16px;
            }
        }
        @media (max-width: 520px) {
            .topic-card .card-img-top {
                height: 130px;
            }
        }

        /* ===== 使用流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            position: relative;
            transition: all var(--transition);
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 20px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
        }
        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .step-arrow {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--text-light);
        }
        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .step-arrow {
                display: none;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .step-item {
                padding: 24px 16px;
            }
        }

        /* ===== 优势亮点 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-item {
            padding: 32px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(37, 99, 235, 0.12);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin: 0 auto 18px;
            transition: all var(--transition);
        }
        .feature-item:hover .feature-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.06);
        }
        .feature-item h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .feature-item {
                padding: 24px 16px;
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
            background: var(--bg-card);
        }
        .faq-item.active {
            border-color: var(--primary);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--secondary);
            background: transparent;
            text-align: left;
            transition: all var(--transition);
            gap: 12px;
        }
        .faq-question:hover {
            background: var(--bg-alt);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-light);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            padding: 0 24px 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.35s ease;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            padding: 0 24px 20px 24px;
            max-height: 400px;
        }
        @media (max-width: 520px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 14px;
            }
            .faq-answer {
                font-size: 14px;
            }
            .faq-item.active .faq-answer {
                padding: 0 16px 16px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--secondary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 41, 59, 0.75) 100%);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 80px 24px;
        }
        .cta-section h2 {
            font-size: 34px;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        @media (max-width: 768px) {
            .cta-section .container {
                padding: 56px 16px;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-section p {
                font-size: 15px;
            }
        }
        @media (max-width: 520px) {
            .cta-section .container {
                padding: 40px 16px;
            }
            .cta-section h2 {
                font-size: 22px;
            }
            .cta-actions {
                flex-direction: column;
                align-items: center;
            }
            .cta-actions .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo a {
            color: #fff;
            font-size: 22px;
        }
        .footer-brand .logo a i {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            margin-top: 14px;
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a:hover {
            color: #fff;
            transform: translateX(4px);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0 28px;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom-links {
            display: flex;
            gap: 18px;
        }
        .footer-bottom-links a {
            color: rgba(255, 255, 255, 0.4);
            font-size: 13px;
            transition: color var(--transition);
        }
        .footer-bottom-links a:hover {
            color: #fff;
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .site-footer {
                padding: 40px 0 0 0;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom-links {
                justify-content: center;
            }
        }

        /* ===== 响应式微调 ===== */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 36px;
            }
        }
        @media (max-width: 520px) {
            .hero-breadcrumb {
                font-size: 12px;
                flex-wrap: wrap;
            }
            .hero-badge {
                font-size: 12px;
                padding: 4px 12px;
            }
            .section-title {
                font-size: 22px;
            }
            .stat-number {
                font-size: 22px;
            }
        }

        /* ===== 辅助类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* 图片占位背景（确保有backpic/coverpic时视觉完整） */
        .img-bg-cover {
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        /* focus 可访问性 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }

        /* 选中文字 */
        ::selection {
            background: var(--primary);
            color: #fff;
        }