/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #1a3a6b;
  --primary-light: #2a5a9e;
  --primary-dark: #0f2440;
  --accent: #f5a623;
  --accent-hover: #e09512;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-dark: #0f1a2e;
  --text: #1e2a41;
  --text-light: #5a6a82;
  --text-white: #f0f4fa;
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
  --transition: all 0.3s ease;
  --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --max-width: 1200px;
  --header-h: 72px;
}
/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.7; font-size: 16px; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
ul, ol { list-style: none; }
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-title { font-size: 2rem; font-weight: 700; text-align: center; margin-bottom: 12px; color: var(--primary-dark); }
.section-sub { font-size: 1.05rem; text-align: center; color: var(--text-light); max-width: 640px; margin: 0 auto 48px; }
/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem; cursor: pointer; transition: var(--transition); border: 2px solid transparent; }
.btn-primary { background: var(--accent); color: #1a1a1a; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #1a1a1a; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,166,35,0.35); }
.btn-outline { background: transparent; color: var(--text-white); border-color: var(--text-white); }
.btn-outline:hover { background: var(--text-white); color: var(--primary-dark); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--primary); border-color: var(--border); }
.btn-ghost:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }
/* ===== Header / Nav ===== */
.header { position: fixed; top: 0; left: 0; width: 100%; height: var(--header-h); background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); z-index: 1000; transition: var(--transition); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { font-size: 1.35rem; font-weight: 800; color: var(--primary-dark); letter-spacing: -0.5px; display: flex; align-items: center; gap: 8px; }
.logo i { color: var(--accent); font-size: 1.5rem; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a { padding: 8px 16px; border-radius: var(--radius-sm); font-weight: 500; color: var(--text); font-size: 0.95rem; transition: var(--transition); }
.nav a:hover { background: rgba(26,58,107,0.06); color: var(--primary); }
.nav a.active { background: var(--primary); color: #fff; }
.nav .cta-btn { background: var(--accent); color: #1a1a1a; padding: 10px 24px; border-radius: var(--radius-sm); font-weight: 700; }
.nav .cta-btn:hover { background: var(--accent-hover); color: #1a1a1a; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,166,35,0.3); }
.nav-toggle { display: none; background: none; font-size: 1.5rem; color: var(--text); cursor: pointer; padding: 4px; }
/* ===== Hero ===== */
.hero { margin-top: var(--header-h); min-height: 92vh; display: flex; align-items: center; position: relative; background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,26,46,0.82) 0%, rgba(26,58,107,0.72) 100%); z-index: 1; }
.hero .container { position: relative; z-index: 2; text-align: center; padding: 60px 24px; }
.hero h1 { font-size: 3.2rem; font-weight: 800; color: var(--text-white); line-height: 1.2; margin-bottom: 20px; letter-spacing: -0.5px; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: 1.15rem; color: rgba(240,244,250,0.85); max-width: 640px; margin: 0 auto 36px; line-height: 1.8; }
.hero .actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero .actions .btn { padding: 14px 36px; font-size: 1.05rem; }
/* ===== Features / 核心说明 ===== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px; }
.feature-card { background: var(--bg-card); border-radius: var(--radius); padding: 36px 28px; text-align: center; box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--border); }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.feature-card .icon { width: 64px; height: 64px; border-radius: 50%; background: rgba(26,58,107,0.08); display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 1.8rem; color: var(--primary); }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--primary-dark); }
.feature-card p { font-size: 0.92rem; color: var(--text-light); line-height: 1.6; }
/* ===== Categories / 分类入口 ===== */
.category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; }
.category-card { background: var(--bg-card); border-radius: var(--radius); padding: 28px 20px; text-align: center; box-shadow: var(--shadow); border: 1px solid var(--border); transition: var(--transition); cursor: pointer; }
.category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
.category-card .cat-icon { font-size: 2.2rem; color: var(--primary); margin-bottom: 12px; }
.category-card h4 { font-size: 1.05rem; font-weight: 700; color: var(--primary-dark); margin-bottom: 4px; }
.category-card p { font-size: 0.85rem; color: var(--text-light); }
/* ===== Latest Posts / 资讯列表 ===== */
.posts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 28px; }
.post-card { background: var(--bg-card); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--border); transition: var(--transition); }
.post-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.post-card .thumb { width: 100%; height: 180px; object-fit: cover; background: #eef2f7; }
.post-card .body { padding: 20px 22px 24px; }
.post-card .tag { display: inline-block; background: rgba(26,58,107,0.1); color: var(--primary); font-size: 0.75rem; font-weight: 600; padding: 2px 12px; border-radius: 20px; margin-bottom: 10px; }
.post-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; color: var(--primary-dark); }
.post-card h3 a { color: inherit; }
.post-card h3 a:hover { color: var(--primary-light); }
.post-card .excerpt { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-card .meta { font-size: 0.8rem; color: var(--text-light); margin-top: 12px; display: flex; align-items: center; gap: 16px; }
.empty-msg { text-align: center; padding: 48px 20px; color: var(--text-light); font-size: 1rem; grid-column: 1 / -1; }
/* ===== Stats / 数据 ===== */
.stats-bg { background: var(--bg-dark); position: relative; overflow: hidden; }
.stats-bg::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; opacity: 0.12; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 32px; position: relative; z-index: 1; text-align: center; }
.stat-item .num { font-size: 2.8rem; font-weight: 800; color: var(--accent); line-height: 1.1; }
.stat-item .label { font-size: 0.95rem; color: rgba(240,244,250,0.75); margin-top: 6px; }
/* ===== Process / 流程 ===== */
.process-steps { display: flex; flex-wrap: wrap; gap: 32px; justify-content: center; counter-reset: step; }
.step { flex: 1 1 180px; max-width: 220px; text-align: center; position: relative; }
.step::after { content: '→'; position: absolute; right: -20px; top: 30px; font-size: 1.6rem; color: var(--border); font-weight: 300; }
.step:last-child::after { display: none; }
.step .circle { width: 60px; height: 60px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.4rem; font-weight: 700; margin: 0 auto 16px; box-shadow: 0 8px 24px rgba(26,58,107,0.25); }
.step h4 { font-size: 1rem; font-weight: 700; color: var(--primary-dark); margin-bottom: 4px; }
.step p { font-size: 0.85rem; color: var(--text-light); }
/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--bg-card); border-radius: var(--radius-sm); border: 1px solid var(--border); overflow: hidden; transition: var(--transition); }
.faq-item summary { padding: 18px 24px; font-weight: 600; color: var(--primary-dark); cursor: pointer; display: flex; align-items: center; gap: 12px; font-size: 1rem; }
.faq-item summary i { color: var(--accent); font-size: 1.1rem; transition: var(--transition); }
.faq-item[open] summary i { transform: rotate(90deg); }
.faq-item .answer { padding: 0 24px 20px; color: var(--text-light); line-height: 1.7; font-size: 0.95rem; }
/* ===== CTA ===== */
.cta-bg { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%); position: relative; overflow: hidden; }
.cta-bg::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat; opacity: 0.08; }
.cta-content { position: relative; z-index: 1; text-align: center; padding: 40px 0; }
.cta-content h2 { font-size: 2rem; font-weight: 700; color: var(--text-white); margin-bottom: 12px; }
.cta-content p { color: rgba(240,244,250,0.8); max-width: 540px; margin: 0 auto 28px; font-size: 1.05rem; }
.cta-content .btn { font-size: 1.1rem; padding: 16px 44px; }
/* ===== Footer ===== */
.footer { background: var(--bg-dark); color: rgba(240,244,250,0.7); padding: 48px 0 32px; }
.footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 32px; }
.footer-brand { max-width: 280px; }
.footer-brand .logo { color: var(--text-white); font-size: 1.2rem; margin-bottom: 8px; }
.footer-brand .logo i { color: var(--accent); }
.footer-brand p { font-size: 0.88rem; line-height: 1.6; }
.footer-links h4 { color: var(--text-white); font-size: 0.95rem; font-weight: 700; margin-bottom: 12px; }
.footer-links a { display: block; color: rgba(240,244,250,0.6); font-size: 0.88rem; padding: 4px 0; transition: var(--transition); }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); margin-top: 32px; padding-top: 20px; text-align: center; font-size: 0.82rem; color: rgba(240,244,250,0.45); }
/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.6rem; }
  .section { padding: 60px 0; }
  .step::after { display: none; }
}
@media (max-width: 768px) {
  .nav { display: none; flex-direction: column; position: absolute; top: var(--header-h); left: 0; width: 100%; background: rgba(255,255,255,0.98); padding: 16px 24px; box-shadow: 0 12px 40px rgba(0,0,0,0.1); border-bottom: 1px solid var(--border); gap: 4px; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 16px; width: 100%; }
  .nav .cta-btn { text-align: center; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .section-title { font-size: 1.6rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat-item .num { font-size: 2rem; }
  .footer .container { flex-direction: column; text-align: center; }
  .footer-brand { max-width: 100%; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 1.6rem; }
  .hero .actions .btn { width: 100%; justify-content: center; }
  .features-grid { grid-template-columns: 1fr; }
  .posts-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr 1fr; }
  .process-steps { flex-direction: column; align-items: center; }
  .step { max-width: 280px; }
  .cta-content h2 { font-size: 1.4rem; }
}

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2a7de1;
            --primary-dark: #1a5cb8;
            --primary-light: #e8f0fe;
            --secondary: #f5a623;
            --secondary-dark: #d4891e;
            --accent: #34c759;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-light: #f0f4f8;
            --bg-dark: #1a1d23;
            --text-primary: #1a1d23;
            --text-secondary: #5a6270;
            --text-muted: #8e95a2;
            --text-inverse: #ffffff;
            --border: #e2e8f0;
            --border-light: #f0f2f5;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.10);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 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: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            padding-top: var(--header-h);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }

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

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            transition: var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--primary);
            font-size: 26px;
        }
        .logo:hover {
            color: var(--primary);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav a.cta-btn {
            background: var(--primary);
            color: var(--text-inverse);
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 14px rgba(42, 125, 225, 0.30);
        }
        .nav a.cta-btn:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(42, 125, 225, 0.40);
            transform: translateY(-2px);
            color: var(--text-inverse);
        }
        .nav-toggle {
            display: none;
            font-size: 24px;
            color: var(--text-primary);
            padding: 8px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            background: none;
        }
        .nav-toggle:hover {
            background: var(--bg-light);
        }

        /* ===== Banner ===== */
        .page-banner {
            position: relative;
            padding: 80px 0 72px;
            background: linear-gradient(135deg, #1a2a4a 0%, #0f1926 100%);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            text-align: center;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(10, 20, 40, 0.72);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            font-size: 44px;
            font-weight: 800;
            color: var(--text-inverse);
            letter-spacing: -1px;
            margin-bottom: 16px;
            line-height: 1.2;
        }
        .page-banner p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 720px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .page-banner .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-bottom: 24px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
        }
        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
        }
        .page-banner .breadcrumb a:hover {
            color: #fff;
        }
        .page-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.5);
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }
        .section-heading {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-heading h2 {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .section-heading p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 620px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .section-heading .sub-badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 50px;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }

        /* ===== Intro Section ===== */
        .intro-section {
            background: var(--bg-white);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .intro-text h3 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 20px;
            line-height: 1.3;
        }
        .intro-text p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .intro-text .intro-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 24px;
        }
        .intro-text .intro-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 15px;
            color: var(--text-primary);
        }
        .intro-text .intro-list li i {
            color: var(--accent);
            font-size: 18px;
            flex-shrink: 0;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .intro-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            transition: var(--transition);
        }
        .intro-image:hover img {
            transform: scale(1.03);
        }

        /* ===== Features / Cards ===== */
        .features-section {
            background: var(--bg-light);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }
        .feature-card .icon-wrap {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 28px;
            color: var(--primary);
            transition: var(--transition);
        }
        .feature-card:hover .icon-wrap {
            background: var(--primary);
            color: var(--text-inverse);
        }
        .feature-card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .feature-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Steps Section ===== */
        .steps-section {
            background: var(--bg-white);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-body);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .step-card .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-inverse);
            font-size: 20px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            box-shadow: 0 4px 12px rgba(42, 125, 225, 0.25);
        }
        .step-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .step-card .step-img {
            width: 100%;
            height: 120px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
        }

        /* ===== Safety Section ===== */
        .safety-section {
            background: var(--bg-light);
        }
        .safety-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .safety-item {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 28px 32px;
            display: flex;
            gap: 20px;
            align-items: flex-start;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .safety-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .safety-item .safety-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: #fff3e0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--secondary);
            flex-shrink: 0;
        }
        .safety-item .safety-icon.green {
            background: #e8f5e9;
            color: var(--accent);
        }
        .safety-item .safety-icon.blue {
            background: var(--primary-light);
            color: var(--primary);
        }
        .safety-item .safety-content h4 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .safety-item .safety-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            background: var(--bg-white);
        }
        .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);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            padding: 20px 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            background: var(--bg-body);
            transition: var(--transition);
            user-select: none;
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-question i {
            font-size: 18px;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            padding: 0 28px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            background: var(--bg-white);
        }
        .faq-item.open .faq-answer {
            padding: 20px 28px 24px;
            max-height: 300px;
        }
        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 72px 0;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-inverse);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .cta-section .cta-btn-large {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            background: var(--text-inverse);
            color: var(--primary);
            padding: 16px 40px;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 700;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
            transition: var(--transition);
        }
        .cta-section .cta-btn-large:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
            color: var(--primary-dark);
        }
        .cta-section .cta-btn-large i {
            font-size: 20px;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
        }
        .footer .container:first-of-type {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 40px;
        }
        .footer-brand .logo {
            color: var(--text-inverse);
            margin-bottom: 16px;
            font-size: 22px;
        }
        .footer-brand .logo i {
            color: var(--primary);
        }
        .footer-brand p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-links h4 {
            color: var(--text-inverse);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-links a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 15px;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom .container {
            padding: 0 24px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .intro-grid {
                gap: 40px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .safety-grid {
                grid-template-columns: 1fr;
            }
            .footer .container:first-of-type {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav {
                display: none;
                position: absolute;
                top: var(--header-h);
                left: 0;
                width: 100%;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px 24px;
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.10);
                border-bottom: 1px solid var(--border);
                gap: 4px;
            }
            .nav.open {
                display: flex;
            }
            .nav a {
                padding: 12px 16px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav a.cta-btn {
                margin-top: 8px;
                justify-content: center;
                width: 100%;
            }
            .nav-toggle {
                display: block;
            }
            .page-banner {
                padding: 56px 0 48px;
            }
            .page-banner h1 {
                font-size: 30px;
            }
            .page-banner p {
                font-size: 16px;
            }
            .section {
                padding: 56px 0;
            }
            .section-heading h2 {
                font-size: 26px;
            }
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-image img {
                height: 260px;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .safety-item {
                flex-direction: column;
                padding: 24px;
            }
            .cta-section h2 {
                font-size: 28px;
            }
            .cta-section .cta-btn-large {
                padding: 14px 32px;
                font-size: 16px;
            }
            .footer .container:first-of-type {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-banner h1 {
                font-size: 24px;
            }
            .page-banner p {
                font-size: 14px;
            }
            .section-heading h2 {
                font-size: 22px;
            }
            .intro-text h3 {
                font-size: 22px;
            }
            .feature-card {
                padding: 28px 20px;
            }
            .step-card {
                padding: 24px 16px;
            }
            .faq-question {
                padding: 16px 20px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 20px;
            }
            .faq-item.open .faq-answer {
                padding: 16px 20px 20px;
            }
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .logo {
                font-size: 18px;
            }
            .logo i {
                font-size: 22px;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
:root {
  --primary: #1a56db;
  --primary-dark: #1245b0;
  --primary-light: #e8effd;
  --secondary: #0d9488;
  --secondary-dark: #0b7a6f;
  --accent: #f59e0b;
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-weak: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --transition: 0.25s ease;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --container: 1140px;
  --header-h: 70px;
}
/* ===== Reset / Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); line-height: 1.7; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: 1rem; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
/* ===== Container ===== */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
/* ===== Header / Nav ===== */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; height: var(--header-h); background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 800; color: var(--primary); letter-spacing: -0.3px; }
.logo i { font-size: 1.5rem; color: var(--secondary); }
.logo:hover { color: var(--primary-dark); }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a { padding: 8px 18px; border-radius: var(--radius); font-size: 0.95rem; font-weight: 500; color: var(--text-weak); transition: all var(--transition); position: relative; }
.nav a:hover { color: var(--primary); background: var(--primary-light); }
.nav a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
.nav a.cta-btn { background: var(--primary); color: #fff !important; padding: 10px 24px; border-radius: var(--radius); font-weight: 600; display: flex; align-items: center; gap: 8px; box-shadow: 0 2px 8px rgba(26,86,219,0.25); }
.nav a.cta-btn:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(26,86,219,0.35); }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text); cursor: pointer; padding: 6px 10px; border-radius: var(--radius-sm); transition: background var(--transition); }
.nav-toggle:hover { background: var(--bg-alt); }
/* ===== Hero / Article Banner ===== */
.article-hero { margin-top: var(--header-h); padding: 80px 0 60px; position: relative; background: linear-gradient(135deg, #0b1a3a 0%, #1a3a6a 50%, #0d4f4a 100%); color: #fff; overflow: hidden; min-height: 280px; display: flex; align-items: center; }
.article-hero::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center/cover no-repeat; opacity: 0.2; mix-blend-mode: overlay; }
.article-hero .container { position: relative; z-index: 2; }
.article-hero .breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; color: rgba(255,255,255,0.7); margin-bottom: 18px; }
.article-hero .breadcrumb a { color: rgba(255,255,255,0.8); }
.article-hero .breadcrumb a:hover { color: #fff; }
.article-hero .breadcrumb span { color: rgba(255,255,255,0.5); }
.article-hero .cat-badge { display: inline-block; background: rgba(255,255,255,0.15); backdrop-filter: blur(4px); padding: 4px 16px; border-radius: 20px; font-size: 0.82rem; font-weight: 500; color: rgba(255,255,255,0.9); margin-bottom: 16px; border: 1px solid rgba(255,255,255,0.1); }
.article-hero h1 { font-size: 2.4rem; font-weight: 800; color: #fff; line-height: 1.25; margin-bottom: 16px; max-width: 860px; letter-spacing: -0.5px; }
.article-hero .meta { display: flex; align-items: center; gap: 20px; font-size: 0.92rem; color: rgba(255,255,255,0.7); flex-wrap: wrap; }
.article-hero .meta i { margin-right: 5px; }
.article-hero .desc { font-size: 1.08rem; color: rgba(255,255,255,0.85); max-width: 720px; margin-top: 12px; line-height: 1.7; }
/* ===== Main Content ===== */
.main-content { padding: 60px 0; }
.article-body { background: var(--card-bg); border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 48px 52px; max-width: 820px; margin: 0 auto; }
.article-body h2 { font-size: 1.65rem; margin-top: 36px; margin-bottom: 16px; color: var(--text); border-bottom: 2px solid var(--primary-light); padding-bottom: 8px; }
.article-body h3 { font-size: 1.3rem; margin-top: 28px; margin-bottom: 12px; color: var(--text); }
.article-body p { margin-bottom: 18px; font-size: 1.02rem; line-height: 1.8; color: #334155; }
.article-body ul, .article-body ol { margin-bottom: 18px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; font-size: 1rem; line-height: 1.7; color: #334155; list-style: disc; }
.article-body ol li { list-style: decimal; }
.article-body blockquote { border-left: 4px solid var(--primary); background: var(--primary-light); padding: 16px 24px; margin: 24px 0; border-radius: 0 var(--radius) var(--radius) 0; color: var(--text); font-style: normal; }
.article-body blockquote p { margin-bottom: 0; }
.article-body code { background: var(--bg-alt); padding: 2px 8px; border-radius: 4px; font-size: 0.9rem; color: var(--primary-dark); }
.article-body pre { background: #1e293b; color: #e2e8f0; padding: 20px 24px; border-radius: var(--radius); overflow-x: auto; margin: 24px 0; font-size: 0.9rem; line-height: 1.6; }
.article-body img { border-radius: var(--radius); margin: 24px auto; box-shadow: var(--shadow-sm); }
.article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.article-body a:hover { color: var(--primary-dark); }
/* ===== Article Footer ===== */
.article-footer { max-width: 820px; margin: 32px auto 0; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; padding: 20px 0; border-top: 1px solid var(--border); }
.article-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.article-tags .tag { background: var(--bg-alt); padding: 4px 14px; border-radius: 20px; font-size: 0.82rem; color: var(--text-weak); border: 1px solid var(--border); transition: all var(--transition); }
.article-tags .tag:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }
.article-share { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; 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-alt); color: var(--text-weak); transition: all var(--transition); }
.article-share a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.article-back { text-align: center; margin-top: 24px; }
.article-back a { display: inline-flex; align-items: center; gap: 8px; color: var(--text-weak); font-size: 0.95rem; }
.article-back a:hover { color: var(--primary); }
/* ===== Related Posts ===== */
.related-section { padding: 60px 0; background: var(--bg-alt); }
.related-section .section-title { font-size: 1.6rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.related-section .section-sub { color: var(--text-weak); font-size: 1rem; margin-bottom: 36px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card { background: var(--card-bg); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: all var(--transition); border: 1px solid var(--border); }
.related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.related-card .card-img { width: 100%; height: 180px; object-fit: cover; background: var(--bg-alt); }
.related-card .card-body { padding: 20px 22px 22px; }
.related-card .card-cat { display: inline-block; font-size: 0.75rem; font-weight: 600; color: var(--secondary); background: rgba(13,148,136,0.08); padding: 2px 12px; border-radius: 12px; margin-bottom: 8px; }
.related-card .card-title { font-size: 1.05rem; font-weight: 700; color: var(--text); margin-bottom: 8px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.related-card .card-title:hover { color: var(--primary); }
.related-card .card-excerpt { font-size: 0.88rem; color: var(--text-weak); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 12px; }
.related-card .card-meta { font-size: 0.8rem; color: var(--text-light); display: flex; align-items: center; gap: 12px; }
.related-empty { grid-column: 1 / -1; text-align: center; padding: 40px 20px; color: var(--text-weak); font-size: 1rem; background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
/* ===== CTA ===== */
.cta-section { padding: 70px 0; background: linear-gradient(135deg, var(--primary) 0%, #0d4f4a 100%); color: #fff; text-align: center; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center/cover no-repeat; opacity: 0.08; mix-blend-mode: overlay; }
.cta-section .container { position: relative; z-index: 2; }
.cta-section h2 { font-size: 1.8rem; font-weight: 700; color: #fff; margin-bottom: 12px; }
.cta-section p { font-size: 1.08rem; color: rgba(255,255,255,0.85); max-width: 600px; margin: 0 auto 28px; }
.cta-section .cta-btn { display: inline-flex; align-items: center; gap: 10px; background: #fff; color: var(--primary); padding: 14px 36px; border-radius: var(--radius); font-size: 1.05rem; font-weight: 700; transition: all var(--transition); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.cta-section .cta-btn:hover { background: var(--accent); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
/* ===== Error State ===== */
.error-section { padding: 120px 0 100px; text-align: center; min-height: 55vh; display: flex; align-items: center; }
.error-section .error-icon { font-size: 3.6rem; color: var(--text-light); margin-bottom: 20px; }
.error-section h2 { font-size: 1.8rem; color: var(--text); margin-bottom: 12px; }
.error-section p { font-size: 1.05rem; color: var(--text-weak); margin-bottom: 28px; max-width: 480px; margin-left: auto; margin-right: auto; }
.error-section .back-home { display: inline-flex; align-items: center; gap: 8px; background: var(--primary); color: #fff; padding: 12px 28px; border-radius: var(--radius); font-weight: 600; transition: all var(--transition); }
.error-section .back-home:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
/* ===== Footer ===== */
.footer { background: #0f172a; color: rgba(255,255,255,0.7); padding: 60px 0 0; }
.footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer .logo { color: #fff; font-size: 1.25rem; margin-bottom: 12px; }
.footer .logo i { color: var(--secondary); }
.footer-brand p { font-size: 0.92rem; line-height: 1.7; max-width: 320px; color: rgba(255,255,255,0.55); }
.footer-links h4 { color: #fff; font-size: 1.05rem; font-weight: 600; margin-bottom: 14px; }
.footer-links a { display: block; color: rgba(255,255,255,0.55); font-size: 0.9rem; padding: 4px 0; transition: all var(--transition); }
.footer-links a:hover { color: #fff; padding-left: 4px; }
.footer-bottom { margin-top: 40px; border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.35); }
.footer-bottom .container { display: block; text-align: center; }
/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .article-body { padding: 36px 32px; }
  .article-hero h1 { font-size: 2rem; }
}
@media (max-width: 768px) {
  :root { --header-h: 62px; }
  .nav { display: none; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); padding: 12px 20px 20px; box-shadow: var(--shadow-md); gap: 4px; }
  .nav.open { display: flex; }
  .nav a { padding: 10px 16px; width: 100%; border-radius: var(--radius-sm); }
  .nav a.cta-btn { justify-content: center; margin-top: 6px; }
  .nav-toggle { display: block; }
  .article-hero { padding: 60px 0 40px; min-height: auto; }
  .article-hero h1 { font-size: 1.6rem; }
  .article-hero .desc { font-size: 0.95rem; }
  .article-body { padding: 24px 18px; border-radius: var(--radius); }
  .article-body h2 { font-size: 1.35rem; }
  .article-body p { font-size: 0.95rem; }
  .article-footer { flex-direction: column; align-items: stretch; gap: 12px; }
  .related-grid { grid-template-columns: 1fr; gap: 16px; }
  .related-section { padding: 40px 0; }
  .cta-section { padding: 50px 0; }
  .cta-section h2 { font-size: 1.4rem; }
  .footer .container { grid-template-columns: 1fr; gap: 28px; }
  .footer-brand p { max-width: 100%; }
  .error-section { padding: 100px 0 80px; }
}
@media (max-width: 520px) {
  .article-hero h1 { font-size: 1.3rem; }
  .article-hero .meta { gap: 12px; font-size: 0.82rem; flex-wrap: wrap; }
  .article-body { padding: 16px 14px; }
  .article-body h2 { font-size: 1.15rem; }
  .container { padding: 0 16px; }
  .cta-section .cta-btn { width: 100%; justify-content: center; }
  .related-card .card-img { height: 150px; }
}