/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #1e3a5f;
  --primary-light: #2d5a8e;
  --primary-dark: #0f1f33;
  --accent: #0ea5e9;
  --accent-light: #38bdf8;
  --accent-dark: #0284c7;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg-body: #f4f6f9;
  --bg-card: #ffffff;
  --bg-sidebar: #0f1f33;
  --bg-sidebar-hover: #1a2f4a;
  --bg-sidebar-active: #2d5a8e;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-light: #f1f5f9;
  --text-sidebar: #cbd5e1;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --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 24px 60px rgba(0,0,0,0.18);
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --sidebar-width: 240px;
  --header-height: 64px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}
/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-sans);font-size:16px;line-height:1.6;color:var(--text-primary);background:var(--bg-body);min-height:100vh;display:flex}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
button,input,textarea,select{font-family:inherit;font-size:inherit;outline:none;border: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(--text-primary)}
h1{font-size:2.8rem;letter-spacing:-0.02em}
h2{font-size:2rem;letter-spacing:-0.01em}
h3{font-size:1.4rem}
h4{font-size:1.1rem}
p{margin-bottom:1rem;color:var(--text-secondary)}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
/* ===== App Shell 布局 ===== */
.app-shell{display:flex;width:100%;min-height:100vh}
/* ===== 侧边导航 ===== */
.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;background:var(--bg-sidebar);z-index:1000;display:flex;flex-direction:column;box-shadow:2px 0 20px rgba(0,0,0,0.2);transition:transform var(--transition)}
.sidebar-brand{display:flex;align-items:center;gap:12px;padding:20px 24px;border-bottom:1px solid rgba(255,255,255,0.06);min-height:72px}
.sidebar-brand .brand-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--accent),var(--accent-dark));border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:800;flex-shrink:0}
.sidebar-brand .brand-text{font-size:16px;font-weight:700;color:#fff;letter-spacing:0.3px;line-height:1.2}
.sidebar-brand .brand-sub{font-size:11px;color:var(--text-sidebar);opacity:0.6;display:block;font-weight:400}
.sidebar-nav{flex:1;overflow-y:auto;padding:16px 12px}
.sidebar-nav .nav-label{font-size:11px;text-transform:uppercase;color:var(--text-sidebar);opacity:0.4;padding:12px 12px 6px;letter-spacing:1px;font-weight:600}
.sidebar-nav .nav-item{display:flex;align-items:center;gap:12px;padding:10px 14px;margin-bottom:2px;border-radius:var(--radius-sm);color:var(--text-sidebar);font-size:14px;font-weight:500;transition:all var(--transition);position:relative}
.sidebar-nav .nav-item i{width:20px;text-align:center;font-size:15px;opacity:0.7}
.sidebar-nav .nav-item:hover{background:var(--bg-sidebar-hover);color:#fff}
.sidebar-nav .nav-item.active,.sidebar-nav .nav-item.active-page{background:var(--bg-sidebar-active);color:#fff;font-weight:600}
.sidebar-nav .nav-item.active::before,.sidebar-nav .nav-item.active-page::before{content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:20px;background:var(--accent);border-radius:0 3px 3px 0}
.sidebar-footer{padding:16px 20px;border-top:1px solid rgba(255,255,255,0.06);font-size:12px;color:var(--text-sidebar);opacity:0.5;text-align:center}
/* ===== 主内容区 ===== */
.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh;display:flex;flex-direction:column}
/* ===== 顶部栏（移动端） ===== */
.topbar{display:none;position:fixed;top:0;left:0;right:0;height:var(--header-height);background:var(--bg-sidebar);z-index:999;align-items:center;padding:0 20px;box-shadow:0 2px 12px rgba(0,0,0,0.15)}
.topbar .topbar-brand{color:#fff;font-size:16px;font-weight:700;display:flex;align-items:center;gap:10px}
.topbar .topbar-brand i{color:var(--accent)}
.topbar .menu-toggle{color:#fff;font-size:22px;background:none;border:none;cursor:pointer;padding:6px;margin-right:12px}
/* ===== Hero 首屏 ===== */
.hero{position:relative;padding:100px 0 80px;background:var(--bg-sidebar);overflow:hidden;min-height:520px;display:flex;align-items:center}
.hero::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') center center/cover no-repeat;opacity:0.2;z-index:0}
.hero::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,31,51,0.92) 40%,rgba(15,31,51,0.7) 100%);z-index:1}
.hero .container{position:relative;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(14,165,233,0.15);border:1px solid rgba(14,165,233,0.25);border-radius:50px;padding:6px 18px 6px 12px;font-size:13px;color:var(--accent-light);margin-bottom:24px}
.hero-badge i{font-size:14px}
.hero h1{font-size:3.2rem;font-weight:800;color:#fff;line-height:1.15;margin-bottom:16px;max-width:720px}
.hero h1 span{background:linear-gradient(135deg,var(--accent-light),#7dd3fc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:1.1rem;color:rgba(255,255,255,0.7);max-width:580px;margin-bottom:32px;line-height:1.7}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 32px;border-radius:50px;font-size:15px;font-weight:600;transition:all var(--transition);border:none;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:#fff;box-shadow:0 4px 20px rgba(14,165,233,0.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px rgba(14,165,233,0.45);color:#fff}
.btn-outline-light{background:transparent;border:2px solid rgba(255,255,255,0.25);color:#fff}
.btn-outline-light:hover{background:rgba(255,255,255,0.08);border-color:rgba(255,255,255,0.4);color:#fff;transform:translateY(-2px)}
.btn-lg{padding:14px 40px;font-size:16px}
.hero-stats{display:flex;flex-wrap:wrap;gap:32px;margin-top:48px;padding-top:36px;border-top:1px solid rgba(255,255,255,0.08)}
.hero-stat{text-align:left}
.hero-stat .num{font-size:2rem;font-weight:800;color:#fff;line-height:1}
.hero-stat .label{font-size:13px;color:rgba(255,255,255,0.5);margin-top:4px}
/* ===== 板块通用 ===== */
.section{padding:80px 0}
.section-alt{background:var(--bg-card)}
.section-dark{background:var(--bg-sidebar);color:#fff}
.section-dark h2,.section-dark h3,.section-dark .section-title{color:#fff}
.section-dark .section-sub{color:rgba(255,255,255,0.6)}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{margin-bottom:12px}
.section-sub{font-size:1.05rem;color:var(--text-muted);max-width:600px;margin:0 auto 12px}
.section-tag{display:inline-block;padding:4px 16px;border-radius:50px;font-size:12px;font-weight:600;color:var(--accent);background:rgba(14,165,233,0.08);margin-bottom:12px;letter-spacing:0.5px}
/* ===== 卡片网格 ===== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:var(--bg-card);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);border:1px solid var(--border);transition:all var(--transition);overflow:hidden}
.card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
.card-img{width:100%;height:200px;object-fit:cover;display:block}
.card-body{padding:20px 24px 24px}
.card-body .card-tag{display:inline-block;padding:2px 12px;border-radius:50px;font-size:12px;font-weight:600;background:rgba(14,165,233,0.08);color:var(--accent);margin-bottom:8px}
.card-body h3{font-size:1.15rem;margin-bottom:8px}
.card-body h3 a{color:var(--text-primary)}
.card-body h3 a:hover{color:var(--accent)}
.card-body p{font-size:14px;color:var(--text-secondary);margin-bottom:12px;line-height:1.6}
.card-body .card-meta{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--text-muted);padding-top:12px;border-top:1px solid var(--border-light)}
.card-body .card-meta i{font-size:13px}
.card-cover{height:180px;border-radius:var(--radius-md) var(--radius-md) 0 0;overflow:hidden;position:relative}
.card-cover img{width:100%;height:100%;object-fit:cover}
.card-cover .overlay{position:absolute;inset:0;background:linear-gradient(0deg,rgba(15,31,51,0.6) 0%,transparent 60%)}
/* ===== 分类卡片（特色） ===== */
.cat-card{display:flex;flex-direction:column;align-items:center;text-align:center;padding:32px 20px;background:var(--bg-card);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);border:1px solid var(--border);transition:all var(--transition)}
.cat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px)}
.cat-card .icon-wrap{width:64px;height:64px;border-radius:var(--radius-md);background:linear-gradient(135deg,rgba(14,165,233,0.1),rgba(14,165,233,0.04));display:flex;align-items:center;justify-content:center;font-size:28px;color:var(--accent);margin-bottom:16px}
.cat-card h3{font-size:1.05rem;margin-bottom:6px}
.cat-card p{font-size:13px;color:var(--text-muted);margin-bottom:16px}
.cat-card .cat-link{font-size:13px;font-weight:600;color:var(--accent);display:inline-flex;align-items:center;gap:6px}
.cat-card .cat-link:hover{color:var(--accent-dark)}
/* ===== 步骤/流程 ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;position:relative}
.step{text-align:center;position:relative}
.step:not(:last-child)::after{content:'';position:absolute;top:36px;left:calc(50% + 40px);width:calc(100% - 80px);height:2px;background:var(--border);background-image:linear-gradient(90deg,var(--border) 60%,transparent 100%)}
.step .step-num{width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:#fff;font-size:1.6rem;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;box-shadow:0 8px 24px rgba(14,165,233,0.25);position:relative;z-index:2}
.step h3{font-size:1.1rem;margin-bottom:8px}
.step p{font-size:14px;color:var(--text-secondary);max-width:260px;margin:0 auto}
/* ===== 数据面板 ===== */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-card{background:var(--bg-card);border-radius:var(--radius-md);padding:28px 24px;text-align:center;box-shadow:var(--shadow-sm);border:1px solid var(--border);transition:all var(--transition)}
.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.stat-card .stat-icon{font-size:28px;color:var(--accent);margin-bottom:8px;opacity:0.7}
.stat-card .stat-num{font-size:2.2rem;font-weight:800;color:var(--primary);line-height:1.1}
.stat-card .stat-label{font-size:14px;color:var(--text-muted);margin-top:4px}
/* ===== FAQ ===== */
.faq-list{max-width:780px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border);padding:20px 0}
.faq-item:first-child{border-top:1px solid var(--border)}
.faq-q{display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-size:1.05rem;font-weight:600;color:var(--text-primary);padding:4px 0;background:none;border:none;width:100%;text-align:left}
.faq-q i{color:var(--text-muted);transition:transform var(--transition);font-size:14px}
.faq-q.open i{transform:rotate(180deg)}
.faq-a{padding-top:12px;font-size:14px;color:var(--text-secondary);line-height:1.7;display:none}
.faq-a.show{display:block}
/* ===== CTA ===== */
.cta-section{background:linear-gradient(135deg,var(--primary-dark),var(--primary));padding:80px 0;text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center center/cover no-repeat;opacity:0.08;z-index:0}
.cta-section .container{position:relative;z-index:1}
.cta-section h2{color:#fff;font-size:2.2rem;margin-bottom:12px}
.cta-section p{color:rgba(255,255,255,0.65);max-width:520px;margin:0 auto 28px;font-size:1.05rem}
.cta-section .btn-primary{background:#fff;color:var(--primary);box-shadow:0 4px 24px rgba(0,0,0,0.2)}
.cta-section .btn-primary:hover{background:var(--accent-light);color:#fff;box-shadow:0 8px 32px rgba(0,0,0,0.3)}
/* ===== 最新资讯列表 ===== */
.post-list{display:flex;flex-direction:column;gap:16px}
.post-item{display:flex;align-items:flex-start;gap:16px;padding:16px 20px;background:var(--bg-card);border-radius:var(--radius-sm);border:1px solid var(--border);transition:all var(--transition)}
.post-item:hover{box-shadow:var(--shadow-sm);border-color:var(--accent);transform:translateX(4px)}
.post-item .post-icon{width:40px;height:40px;border-radius:var(--radius-sm);background:rgba(14,165,233,0.08);display:flex;align-items:center;justify-content:center;color:var(--accent);flex-shrink:0;font-size:16px}
.post-item .post-content{flex:1;min-width:0}
.post-item .post-title{font-size:15px;font-weight:600;color:var(--text-primary);display:block;margin-bottom:4px;line-height:1.4}
.post-item .post-title:hover{color:var(--accent)}
.post-item .post-excerpt{font-size:13px;color:var(--text-muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:4px}
.post-item .post-meta{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:12px}
.post-item .post-meta .cat-badge{padding:1px 10px;border-radius:50px;font-size:11px;font-weight:600;background:rgba(14,165,233,0.08);color:var(--accent)}
.post-empty{text-align:center;padding:48px 24px;color:var(--text-muted);font-size:15px;background:var(--bg-card);border-radius:var(--radius-md);border:1px dashed var(--border)}
.post-empty i{font-size:36px;display:block;margin-bottom:12px;opacity:0.4}
/* ===== 页脚 ===== */
.footer{background:var(--bg-sidebar);color:var(--text-sidebar);padding:48px 0 24px;margin-top:auto}
.footer-inner{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:32px}
.footer-brand .brand-text{font-size:18px;font-weight:700;color:#fff;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.footer-brand .brand-text i{color:var(--accent)}
.footer-brand p{font-size:13px;color:rgba(255,255,255,0.5);max-width:320px;line-height:1.7}
.footer h4{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px;letter-spacing:0.5px}
.footer ul li{margin-bottom:8px}
.footer ul li a{font-size:13px;color:var(--text-sidebar);opacity:0.7;transition:all var(--transition)}
.footer ul li a:hover{opacity:1;color:var(--accent-light)}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.06);padding-top:20px;text-align:center;font-size:13px;color:rgba(255,255,255,0.35)}
/* ===== 响应式 ===== */
@media(max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  :root{--sidebar-width:0px}
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .topbar{display:flex}
  .main-content{margin-left:0;padding-top:var(--header-height)}
  .hero{padding:60px 0 50px;min-height:auto}
  .hero h1{font-size:2rem}
  .hero p{font-size:0.95rem}
  .hero-stats{gap:20px;margin-top:32px;padding-top:24px}
  .hero-stat .num{font-size:1.4rem}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr;gap:24px}
  .step:not(:last-child)::after{display:none}
  .footer-inner{grid-template-columns:1fr;gap:24px}
  .section{padding:48px 0}
  .section-header{margin-bottom:28px}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .stat-card{padding:20px 16px}
  .stat-card .stat-num{font-size:1.6rem}
  .grid-4{grid-template-columns:repeat(2,1fr);gap:12px}
  .hero h1{font-size:1.8rem}
  .hero-actions{flex-direction:column;align-items:stretch}
  .btn-lg{padding:12px 24px;text-align:center}
  .post-item{padding:12px 16px}
  .faq-q{font-size:0.95rem}
}
@media(max-width:520px){
  .hero h1{font-size:1.5rem}
  .hero-stats{flex-direction:column;gap:12px}
  .stats-grid{grid-template-columns:1fr 1fr;gap:8px}
  .grid-4{grid-template-columns:1fr 1fr;gap:8px}
  .container{padding:0 16px}
  .section{padding:36px 0}
  .cat-card{padding:20px 16px}
}
/* ===== 移动端遮罩 ===== */
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:998}
.sidebar-overlay.show{display:block}
@media(max-width:768px){
  .sidebar-overlay.show{display:block}
}

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a6b4f;
            --primary-light: #229b73;
            --primary-dark: #0f4a37;
            --primary-bg: #eaf7f2;
            --accent: #f5a623;
            --accent-light: #ffc857;
            --bg: #f6f9fc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --text: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-weak: #7a8a9a;
            --border: #dce4ec;
            --border-light: #eef2f6;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 14px rgba(0, 20, 30, 0.06);
            --shadow-lg: 0 12px 36px rgba(0, 20, 30, 0.08);
            --shadow-hover: 0 8px 28px rgba(0, 20, 30, 0.12);
            --transition: 0.25s ease;
            --sidebar-width: 240px;
            --header-height: 0px;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        }

        /* ===== 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-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
        }

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

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

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

        ul {
            list-style: none;
        }

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

        /* ===== Layout: Sidebar + Main ===== */
        .app-wrapper {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            width: var(--sidebar-width);
            background: var(--bg-white);
            border-right: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            padding: 24px 0 16px;
            transition: transform var(--transition);
            box-shadow: 2px 0 12px rgba(0, 0, 0, 0.02);
        }

        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 20px 24px;
            border-bottom: 1px solid var(--border-light);
            margin-bottom: 16px;
        }

        .brand-icon {
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 20px;
            flex-shrink: 0;
            box-shadow: 0 4px 10px rgba(26, 107, 79, 0.25);
        }

        .brand-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.2;
        }

        .brand-sub {
            font-size: 12px;
            color: var(--text-weak);
            font-weight: 400;
            display: block;
            line-height: 1.2;
        }

        .sidebar-nav {
            flex: 1;
            padding: 0 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }

        .nav-label {
            font-size: 11px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.8px;
            color: var(--text-weak);
            padding: 12px 10px 6px;
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 14px;
            transition: background var(--transition), color var(--transition);
        }
        .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 15px;
            color: var(--text-weak);
            transition: color var(--transition);
        }
        .nav-item:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .nav-item:hover i {
            color: var(--primary);
        }
        .nav-item.active {
            background: var(--primary-bg);
            color: var(--primary-dark);
            font-weight: 600;
        }
        .nav-item.active i {
            color: var(--primary);
        }
        .nav-item:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .sidebar-footer {
            padding: 16px 20px 0;
            font-size: 12px;
            color: var(--text-weak);
            border-top: 1px solid var(--border-light);
            margin-top: 8px;
            text-align: center;
        }

        /* ===== Main Content Area ===== */
        .main-area {
            margin-left: var(--sidebar-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .page-content {
            flex: 1;
            padding: 32px 0 60px;
        }

        /* ===== Article Header ===== */
        .article-header {
            margin-bottom: 32px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border-light);
        }

        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-weak);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a {
            color: var(--text-weak);
        }
        .article-breadcrumb a:hover {
            color: var(--primary);
        }
        .article-breadcrumb .sep {
            color: var(--border);
            font-size: 12px;
        }

        .article-category-badge {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
        }

        .article-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
            margin-bottom: 12px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: var(--text-weak);
        }
        .article-meta i {
            margin-right: 4px;
            color: var(--primary-light);
        }

        /* ===== Article Cover ===== */
        .article-cover {
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin-bottom: 32px;
            box-shadow: var(--shadow-md);
            aspect-ratio: 16/9;
            background: var(--border-light);
        }
        .article-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* ===== Article Body ===== */
        .article-body {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text);
            max-width: 800px;
        }
        .article-body p {
            margin-bottom: 1.2em;
        }
        .article-body h2,
        .article-body h3 {
            margin-top: 1.6em;
            margin-bottom: 0.6em;
            font-weight: 700;
            color: var(--text);
        }
        .article-body h2 {
            font-size: 24px;
        }
        .article-body h3 {
            font-size: 20px;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 1.2em;
            padding-left: 1.6em;
        }
        .article-body li {
            margin-bottom: 0.4em;
        }
        .article-body ul li {
            list-style: disc;
        }
        .article-body ol li {
            list-style: decimal;
        }
        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body a:hover {
            color: var(--primary-light);
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 20px;
            margin: 1.4em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.4em 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.4em 0;
            font-size: 14px;
        }
        .article-body th,
        .article-body td {
            padding: 10px 14px;
            border: 1px solid var(--border);
            text-align: left;
        }
        .article-body th {
            background: var(--primary-bg);
            font-weight: 600;
            color: var(--primary-dark);
        }
        .article-body td {
            background: var(--bg-white);
        }

        /* ===== Article Footer ===== */
        .article-footer {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tag {
            background: var(--bg);
            color: var(--text-secondary);
            font-size: 12px;
            padding: 4px 14px;
            border-radius: 20px;
            border: 1px solid var(--border-light);
            transition: background var(--transition), color var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--primary-bg);
            color: var(--primary);
            border-color: var(--primary);
        }

        .article-share {
            display: flex;
            gap: 10px;
            align-items: center;
            font-size: 13px;
            color: var(--text-weak);
        }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg);
            color: var(--text-secondary);
            border: 1px solid var(--border-light);
            transition: background var(--transition), color var(--transition), border-color var(--transition);
        }
        .article-share a:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        /* ===== Article Navigation ===== */
        .article-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
        }
        .article-nav a {
            flex: 1;
            min-width: 200px;
            padding: 16px 20px;
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            transition: box-shadow var(--transition), border-color var(--transition);
            color: var(--text);
        }
        .article-nav a:hover {
            box-shadow: var(--shadow-hover);
            border-color: var(--primary);
        }
        .article-nav .nav-label-sm {
            font-size: 12px;
            color: var(--text-weak);
            display: block;
            margin-bottom: 4px;
        }
        .article-nav .nav-title-sm {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
        }

        /* ===== Related Posts ===== */
        .related-section {
            margin-top: 56px;
        }
        .related-section h2 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--text);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
        }

        .related-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .related-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .related-card .rc-cover {
            aspect-ratio: 16/9;
            background: var(--border-light);
            overflow: hidden;
        }
        .related-card .rc-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .related-card:hover .rc-cover img {
            transform: scale(1.04);
        }
        .related-card .rc-body {
            padding: 16px 18px 18px;
        }
        .related-card .rc-cat {
            font-size: 11px;
            color: var(--primary);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .related-card .rc-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin: 6px 0 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .rc-title a {
            color: inherit;
        }
        .related-card .rc-title a:hover {
            color: var(--primary);
        }
        .related-card .rc-meta {
            font-size: 12px;
            color: var(--text-weak);
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .not-found-box .nf-icon {
            font-size: 64px;
            color: var(--border);
            margin-bottom: 16px;
        }
        .not-found-box h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .not-found-box .btn-back {
            display: inline-block;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }
        .not-found-box .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            color: #fff;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-white);
            border-top: 1px solid var(--border-light);
            padding: 40px 0 24px;
            margin-top: auto;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border-light);
        }
        .footer-brand .brand-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .footer-brand .brand-text i {
            color: var(--primary);
            margin-right: 6px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 14px;
        }
        .footer ul li {
            margin-bottom: 8px;
        }
        .footer ul li a {
            font-size: 14px;
            color: var(--text-secondary);
        }
        .footer ul li a:hover {
            color: var(--primary);
        }
        .footer-bottom {
            text-align: center;
            font-size: 13px;
            color: var(--text-weak);
            padding-top: 20px;
        }

        /* ===== Mobile Toggle ===== */
        .sidebar-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 40px;
            height: 40px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-sm);
            cursor: pointer;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text);
            transition: background var(--transition);
        }
        .sidebar-toggle:hover {
            background: var(--primary-bg);
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.3);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-title {
                font-size: 28px;
            }
            .related-grid {
                grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.open {
                display: block;
                opacity: 1;
            }
            .sidebar-toggle {
                display: flex;
            }
            .main-area {
                margin-left: 0;
            }
            .page-content {
                padding: 24px 0 40px;
            }
            .container {
                padding: 0 16px;
            }
            .article-title {
                font-size: 24px;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .article-nav a {
                min-width: 100%;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 520px) {
            .article-title {
                font-size: 20px;
            }
            .article-meta {
                flex-direction: column;
                gap: 6px;
            }
            .article-footer {
                flex-direction: column;
                align-items: flex-start;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .sidebar-toggle {
                top: 12px;
                left: 12px;
                width: 36px;
                height: 36px;
                font-size: 16px;
            }
            .brand-text {
                font-size: 18px;
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a73e8;
            --primary-dark: #0d47a1;
            --primary-light: #e8f0fe;
            --accent: #f5a623;
            --accent-dark: #d4891a;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-sidebar: #0f1923;
            --bg-sidebar-hover: #1a2d3d;
            --bg-sidebar-active: #1a73e8;
            --text-primary: #1a2a3a;
            --text-secondary: #5a6a7a;
            --text-light: #8a9aaa;
            --text-white: #ffffff;
            --text-sidebar: #b0c4d8;
            --border-color: #e2e8f0;
            --border-light: #f0f2f5;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --sidebar-width: 260px;
            --header-height: 0px;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --gap-section: 80px;
            --gap-card: 24px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            font-size: 16px;
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: none;
            outline: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.6rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== Sidebar 导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
        }
        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .sidebar-brand .brand-icon {
            width: 44px;
            height: 44px;
            background: var(--primary);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.4rem;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 4px 12px rgba(26, 115, 232, 0.35);
        }
        .sidebar-brand .brand-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
        }
        .sidebar-brand .brand-sub {
            font-size: 0.75rem;
            color: var(--text-sidebar);
            opacity: 0.7;
            letter-spacing: 0.5px;
        }
        .sidebar-nav {
            flex: 1;
            padding: 20px 16px;
            overflow-y: auto;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: rgba(255, 255, 255, 0.3);
            padding: 0 12px 10px;
            font-weight: 600;
        }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-sidebar);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            margin-bottom: 2px;
            position: relative;
        }
        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .sidebar-nav .nav-item:hover {
            background: var(--bg-sidebar-hover);
            color: #fff;
        }
        .sidebar-nav .nav-item.active {
            background: var(--bg-sidebar-active);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 115, 232, 0.3);
        }
        .sidebar-footer {
            padding: 18px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.3);
            text-align: center;
        }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== 移动端顶部栏 ===== */
        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: var(--bg-sidebar);
            z-index: 999;
            padding: 0 16px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
        }
        .mobile-topbar .brand-text {
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
        }
        .mobile-topbar .hamburger {
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .mobile-topbar .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .sidebar-overlay.show {
            opacity: 1;
        }

        /* ===== Banner ===== */
        .page-banner {
            background: linear-gradient(135deg, #0d1b2a 0%, #1b2d45 50%, #0f1923 100%);
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(26, 115, 232, 0.15) 0%, transparent 70%);
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            color: #fff;
            font-size: 2.8rem;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .page-banner h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .page-banner p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            max-width: 680px;
            margin-bottom: 0;
        }
        .page-banner .banner-tags {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-top: 20px;
        }
        .page-banner .banner-tags span {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 6px 16px;
            border-radius: 50px;
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.85rem;
            font-weight: 500;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--bg-white);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            margin-bottom: 12px;
            position: relative;
            display: inline-block;
        }
        .section-header h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-header p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 12px auto 0;
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap-card);
        }
        .card-grid.cols-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
            flex-shrink: 0;
        }
        .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .card-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            flex: 1;
            margin-bottom: 16px;
        }
        .card-body .card-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 50px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .card-body .btn {
            align-self: flex-start;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.92rem;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 115, 232, 0.25);
        }
        .btn:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 24px rgba(26, 115, 232, 0.35);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 115, 232, 0.2);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
            box-shadow: none;
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26, 115, 232, 0.2);
            transform: translateY(-2px);
        }
        .btn-accent {
            background: var(--accent);
            color: #1a2a3a;
            box-shadow: 0 4px 14px rgba(245, 166, 35, 0.3);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            box-shadow: 0 6px 24px rgba(245, 166, 35, 0.4);
            color: #1a2a3a;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 6px 18px;
            font-size: 0.82rem;
        }
        .btn-lg {
            padding: 14px 40px;
            font-size: 1.05rem;
        }

        /* ===== 步骤流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--border-color);
            line-height: 1;
            transition: var(--transition);
        }
        .step-item:hover::before {
            color: var(--primary-light);
        }
        .step-item .step-icon {
            width: 60px;
            height: 60px;
            background: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 1.6rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .step-item:hover .step-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.05);
        }
        .step-item h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== 数据/特色卡 ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .feature-card .f-icon {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .feature-card h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .feature-card .f-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .feature-card .f-label {
            font-size: 0.85rem;
            color: var(--text-light);
            font-weight: 500;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-primary);
            transition: var(--transition);
            user-select: none;
            background: none;
            width: 100%;
            text-align: left;
        }
        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--text-light);
            font-size: 0.85rem;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 400px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #0d1b2a 0%, #1a2d45 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2.2rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-section .btn {
            font-size: 1.05rem;
            padding: 14px 44px;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-sidebar);
            color: rgba(255, 255, 255, 0.7);
            padding: 50px 0 30px;
            margin-top: auto;
        }
        .footer .container {
            max-width: var(--container-max);
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 30px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand .brand-text {
            color: #fff;
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .footer-brand .brand-text i {
            color: var(--accent);
            margin-right: 8px;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.7;
            margin-bottom: 0;
            max-width: 360px;
        }
        .footer h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer ul li {
            margin-bottom: 10px;
        }
        .footer ul li a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.88rem;
            transition: var(--transition);
        }
        .footer ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.3);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 分割线 ===== */
        .divider {
            width: 60px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
            margin: 20px auto;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-topbar {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: 60px;
            }
            .page-banner {
                padding: 60px 0 40px;
                min-height: 240px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .section {
                padding: 50px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .card-grid.cols-2 {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer {
                padding: 36px 0 24px;
            }
            .cta-section {
                padding: 50px 0;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .container {
                padding: 0 16px;
            }
            .step-item {
                padding: 24px 20px;
            }
            .feature-card {
                padding: 24px 20px;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .sidebar-overlay.show {
                display: block;
            }
            .sidebar-overlay {
                display: none;
            }
            .sidebar-overlay.show {
                display: block;
                animation: fadeIn 0.3s ease forwards;
            }
            @keyframes fadeIn {
                from {
                    opacity: 0;
                }
                to {
                    opacity: 1;
                }
            }
        }

        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner .banner-tags span {
                font-size: 0.75rem;
                padding: 4px 12px;
            }
            .btn-lg {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
            .card-body {
                padding: 18px;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.92rem;
            }
            .faq-answer {
                font-size: 0.88rem;
            }
        }

        /* ===== 实用辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.72rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 50px;
            letter-spacing: 0.3px;
        }
        .badge-accent {
            background: rgba(245, 166, 35, 0.15);
            color: var(--accent-dark);
        }
        .badge-green {
            background: rgba(16, 185, 129, 0.12);
            color: #0d9e6c;
        }