/* roulang page: index */
:root {
  --c-primary: #2E76D6;
  --c-primary-light: #E2EEFA;
  --c-primary-deep: #175CA8;
  --c-accent: #FFB020;
  --c-success: #0FA874;
  --c-bg: #F5F9FD;
  --c-bg-2: #EAF2FA;
  --c-surface: #FFFFFF;
  --c-text: #16283A;
  --c-muted: #5B6B7C;
  --c-border: #D8E6F2;
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --shadow-card: 0 6px 24px rgba(22,40,58,0.08);
  --shadow-hover: 0 12px 40px rgba(23,92,168,0.15);
  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --space-section: 72px;
  --space-card: 24px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: var(--c-primary); transition: color .2s ease; }
a:hover { color: var(--c-primary-deep); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; border: 1px solid var(--c-border); border-radius: 12px; padding: 10px 16px; outline: none; background: var(--c-surface); }
input:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }

/* Layout */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 260px;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
}
.sidebar-brand { padding: 32px 24px 20px; border-bottom: 1px solid var(--c-border); }
.sidebar-brand .brand { display: flex; align-items: center; gap: 12px; }
.brand-icon {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--c-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 18px; font-weight: 700; color: var(--c-text); }
.brand-text small { font-size: 12px; color: var(--c-muted); }
.sidebar-nav { flex: 1; padding: 24px 16px; display: flex; flex-direction: column; gap: 4px; }
.sidebar-nav .nav-link {
  display: flex; align-items: center;
  height: 48px; padding: 0 16px;
  border-radius: 10px;
  color: var(--c-text); font-size: 15px; font-weight: 500;
  position: relative; transition: background .2s ease, color .2s ease;
}
.sidebar-nav .nav-link:hover { background: var(--c-bg-2); color: var(--c-text); }
.sidebar-nav .nav-link.active { background: var(--c-primary-light); color: var(--c-primary); font-weight: 600; }
.sidebar-nav .nav-link.active::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 4px; height: 20px; border-radius: 0 4px 4px 0; background: var(--c-primary);
}
.sidebar-foot { padding: 20px 24px; border-top: 1px solid var(--c-border); }
.sidebar-foot p { font-size: 13px; color: var(--c-muted); line-height: 1.5; }

/* Mobile Header */
.mobile-header { display: none; }
@media (max-width: 1024px) {
  .sidebar { display: none; }
  .main-content, .footer { margin-left: 0 !important; }
  .mobile-header {
    display: block; position: sticky; top: 0; z-index: 99;
    background: var(--c-surface); box-shadow: 0 2px 8px rgba(22,40,58,0.08);
  }
  .mobile-topbar {
    height: 60px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px;
  }
  .menu-toggle {
    width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
    border-radius: 8px; background: var(--c-bg-2);
  }
  .menu-toggle span { display: block; width: 18px; height: 2px; background: var(--c-text); position: relative; transition: background .2s; }
  .menu-toggle span::before, .menu-toggle span::after { content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--c-text); transition: transform .2s; }
  .menu-toggle span::before { top: -6px; }
  .menu-toggle span::after { top: 6px; }
  .mobile-brand { font-size: 17px; font-weight: 700; color: var(--c-text); }
  .mobile-drawer { display: none; background: var(--c-surface); border-top: 1px solid var(--c-border); padding: 8px 16px 16px; }
  .mobile-drawer.open { display: block; }
  .mobile-drawer .nav-link { display: block; padding: 12px 16px; border-radius: 10px; color: var(--c-text); font-size: 15px; font-weight: 500; }
  .mobile-drawer .nav-link:hover { background: var(--c-bg-2); }
  .mobile-drawer .nav-link.active { background: var(--c-primary-light); color: var(--c-primary); font-weight: 600; }
}

/* Main Content */
.main-content { margin-left: 260px; min-height: 100vh; }
.footer { margin-left: 260px; }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 40px; }
.section { padding: var(--space-section) 0; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 40px; }
.section-head h2 { font-size: 22px; font-weight: 700; line-height: 1.4; color: var(--c-text); }
.section-tag {
  font-size: 13px; color: var(--c-primary); background: var(--c-primary-light);
  padding: 6px 14px; border-radius: 999px; font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; font-weight: 600; transition: all .25s ease;
  font-size: 15px;
}
.btn-primary { background: var(--c-primary); color: #fff; padding: 12px 32px; min-width: 120px; }
.btn-primary:hover { background: var(--c-primary-deep); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(23,92,168,0.3); }
.btn-primary:active { transform: translateY(0); }
.btn-light-pill {
  background: #fff; color: var(--c-primary);
  padding: 0 40px; height: 56px; min-width: 260px;
  font-size: 16px; font-weight: 700; border-radius: 999px;
  box-shadow: 0 4px 20px rgba(22,40,58,0.12);
  transition: all .25s ease;
}
.btn-light-pill:hover { background: var(--c-primary-light); color: var(--c-primary); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(22,40,58,0.18); }
.btn-light-pill:active { transform: translateY(0); }

/* Hero */
.hero {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px;
  align-items: center; padding: 64px 40px;
  background: linear-gradient(135deg, var(--c-bg) 0%, var(--c-primary-light) 100%);
  border-bottom: 1px solid var(--c-border);
}
.hero-content { max-width: 100%; }
.hero-content h1 { font-size: 32px; font-weight: 700; line-height: 1.3; color: var(--c-text); margin-bottom: 12px; }
.hero-subtitle { font-size: 18px; font-weight: 500; color: var(--c-primary); margin-bottom: 16px; }
.hero-desc { font-size: 15px; color: var(--c-muted); line-height: 1.75; margin-bottom: 24px; max-width: 460px; }
.hero-card {
  position: relative; width: 100%; max-width: 360px; height: 560px; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-card); margin-left: auto;
  background-size: cover; background-position: center;
}
.hero-card-media { position: absolute; inset: 0; background-size: cover; background-position: center; }
.hero-card-overlay { position: absolute; inset: 0; background: linear-gradient(to bottom, transparent 30%, rgba(22,40,58,0.85) 100%); }
.hero-card-content { position: absolute; left: 24px; right: 24px; bottom: 24px; color: #fff; }
.hero-card-tag { display: inline-block; font-size: 12px; background: var(--c-accent); color: var(--c-text); padding: 4px 10px; border-radius: 6px; font-weight: 600; margin-bottom: 10px; }
.hero-card-title { font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.hero-card-meta { font-size: 13px; opacity: 0.9; }
.hero-card-badge { position: absolute; top: 16px; right: 16px; background: rgba(255,176,32,0.95); color: var(--c-text); font-size: 12px; font-weight: 700; padding: 6px 12px; border-radius: 6px; }

@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; padding: 48px 24px; gap: 32px; }
  .hero-card { max-width: 320px; height: 420px; margin: 0 auto; }
}

/* Hot Cards */
.hot-section { padding: 72px 40px; }
.hot-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.hot-card {
  background: var(--c-surface); border-radius: var(--radius-md); overflow: hidden;
  box-shadow: var(--shadow-card); transition: box-shadow .3s ease, transform .3s ease;
}
.hot-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.hot-media { position: relative; aspect-ratio: 3 / 4; overflow: hidden; }
.hot-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.hot-card:hover .hot-media img { transform: scale(1.04); }
.hot-label { position: absolute; top: 12px; right: 12px; background: var(--c-accent); color: var(--c-text); font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 6px; }
.hot-duration { position: absolute; bottom: 12px; left: 12px; background: rgba(22,40,58,0.7); color: #fff; font-size: 12px; padding: 3px 8px; border-radius: 6px; }
.hot-play { position: absolute; bottom: 12px; right: 12px; width: 32px; height: 32px; border-radius: 50%; background: rgba(255,255,255,0.3); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 14px; transition: background .3s; }
.hot-card:hover .hot-play { background: var(--c-primary); }
.hot-card-body { padding: 20px 24px 24px; }
.hot-card-body h3 { font-size: 18px; font-weight: 600; margin-bottom: 6px; }
.hot-card-body p { font-size: 14px; color: var(--c-muted); line-height: 1.5; }

@media (max-width: 768px) {
  .hot-grid { grid-template-columns: 1fr; gap: 20px; }
  .hot-section { padding: 48px 16px; }
}

/* Pick List */
.pick-section { padding: 72px 40px; background: var(--c-bg-2); border-top: 1px solid var(--c-border); }
.pick-list { display: flex; flex-direction: column; }
.pick-item {
  display: flex; align-items: center; gap: 20px;
  padding: 16px 12px; border-bottom: 1px solid var(--c-border);
  transition: background .2s ease, box-shadow .2s ease; min-height: 88px;
  position: relative;
}
.pick-item:hover { background: var(--c-surface); box-shadow: 0 4px 16px rgba(22,40,58,0.06); border-radius: 12px; }
.pick-item:hover::before { content: ""; position: absolute; left: 0; top: 12px; bottom: 12px; width: 4px; border-radius: 4px; background: var(--c-primary); }
.pick-num { font-size: 28px; font-weight: 700; color: var(--c-primary); min-width: 48px; text-align: center; font-variant-numeric: tabular-nums; }
.pick-thumb { width: 72px; height: 72px; border-radius: 12px; object-fit: cover; flex-shrink: 0; }
.pick-info { flex: 1; }
.pick-info h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; color: var(--c-text); }
.pick-source { display: inline-block; font-size: 12px; color: var(--c-muted); background: var(--c-bg); padding: 2px 8px; border-radius: 6px; }
.pick-link { font-size: 14px; font-weight: 600; color: var(--c-primary); white-space: nowrap; transition: color .2s; }
.pick-link:hover { color: var(--c-primary-deep); }

@media (max-width: 768px) {
  .pick-section { padding: 48px 16px; }
  .pick-item { flex-wrap: wrap; gap: 12px; }
  .pick-thumb { width: 60px; height: 60px; }
  .pick-num { font-size: 22px; min-width: 36px; }
}

/* Reviews */
.reviews-section { padding: 72px 40px; }
.reviews-scroll { display: flex; gap: 20px; overflow-x: auto; padding-bottom: 8px; scroll-snap-type: x mandatory; scrollbar-width: none; }
.reviews-scroll::-webkit-scrollbar { display: none; }
.review-card {
  min-width: 280px; max-width: 280px; background: var(--c-surface);
  border: 1px solid var(--c-border); border-radius: var(--radius-md);
  padding: 24px; scroll-snap-align: start;
  box-shadow: var(--shadow-card); transition: box-shadow .3s;
}
.review-card:hover { box-shadow: var(--shadow-hover); }
.rating { color: var(--c-accent); font-size: 18px; letter-spacing: 4px; margin-bottom: 12px; }
.review-card p { font-size: 14px; color: var(--c-text); line-height: 1.6; margin-bottom: 16px; min-height: 44px; }
.review-source { font-size: 13px; color: var(--c-muted); }
.review-source strong { color: var(--c-text); font-weight: 600; }
@media (max-width: 768px) {
  .reviews-section { padding: 48px 16px; }
  .review-card { min-width: 240px; max-width: 240px; }
}

/* CTA */
.cta-section {
  padding: 72px 40px; text-align: center;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-deep));
  color: #fff;
}
.cta-section h2 { font-size: 26px; font-weight: 700; margin-bottom: 12px; color: #fff; }
.cta-section p { font-size: 15px; color: rgba(255,255,255,0.85); margin-bottom: 32px; max-width: 480px; margin-left: auto; margin-right: auto; }
@media (max-width: 768px) {
  .cta-section { padding: 48px 16px; }
  .cta-section h2 { font-size: 22px; }
  .btn-light-pill { width: 100%; max-width: 320px; }
}

/* News List */
.news-section { padding: 72px 40px; }
.news-list { max-width: 900px; margin: 0 auto; }
.news-item {
  padding: 20px 8px; border-bottom: 1px solid var(--c-border);
  display: flex; flex-direction: column; gap: 6px; transition: background .2s;
}
.news-item:hover { background: var(--c-surface); border-radius: 12px; padding-left: 16px; padding-right: 16px; }
.news-badge { display: inline-block; font-size: 12px; color: var(--c-primary); background: var(--c-primary-light); padding: 3px 10px; border-radius: 6px; align-self: flex-start; }
.news-item h3 { font-size: 17px; font-weight: 600; }
.news-item h3 a { color: var(--c-text); }
.news-item h3 a:hover { color: var(--c-primary); }
.news-summary { font-size: 14px; color: var(--c-muted); line-height: 1.6; }
.news-meta { display: flex; align-items: center; gap: 16px; font-size: 13px; color: var(--c-muted); }
.news-meta time { font-variant-numeric: tabular-nums; }
.news-link { font-weight: 600; font-size: 14px; color: var(--c-primary); }
.news-link:hover { color: var(--c-primary-deep); }
.empty-state {
  border: 1px dashed var(--c-primary); border-radius: var(--radius-md);
  padding: 32px; text-align: center; color: var(--c-muted); font-size: 14px;
  max-width: 900px; margin: 0 auto;
}
@media (max-width: 768px) {
  .news-section { padding: 48px 16px; }
  .news-item h3 { font-size: 16px; }
}

/* FAQ */
.faq-section { padding: 72px 40px; background: var(--c-bg-2); border-top: 1px solid var(--c-border); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-sm); overflow: hidden;
  transition: border-color .3s;
}
.faq-item[open] { border-color: var(--c-primary); }
.faq-item summary {
  padding: 20px 24px; font-size: 15px; font-weight: 600; color: var(--c-text);
  cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center;
  transition: color .2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 22px; color: var(--c-primary); font-weight: 400; transition: transform .3s ease; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover { color: var(--c-primary); }
.faq-item p { padding: 0 24px 20px; font-size: 14px; color: var(--c-muted); line-height: 1.7; }
@media (max-width: 768px) {
  .faq-section { padding: 48px 16px; }
  .faq-item summary { padding: 16px 18px; }
  .faq-item p { padding: 0 18px 16px; }
}

/* Footer */
.footer { background: var(--c-text); color: rgba(255,255,255,0.8); padding: 56px 40px 0; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 32px; max-width: 1200px; margin: 0 auto; padding-bottom: 40px;
}
.footer-brand { display: flex; flex-direction: column; gap: 8px; }
.footer-brand-icon {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--c-primary); color: #fff; font-size: 20px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; margin-bottom: 4px;
}
.footer-brand strong { font-size: 20px; color: #fff; }
.footer-brand p { font-size: 13px; color: rgba(255,255,255,0.65); line-height: 1.6; }
.footer-col h3 { font-size: 15px; color: #fff; margin-bottom: 16px; font-weight: 600; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,0.7); margin-bottom: 10px; transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-col p { font-size: 14px; color: rgba(255,255,255,0.7); margin-bottom: 10px; line-height: 1.6; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0;
  text-align: center; font-size: 12px; color: rgba(255,255,255,0.5);
  max-width: 1200px; margin: 0 auto;
}
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
}
@media (max-width: 768px) {
  .footer { padding: 40px 16px 0; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* Responsive base */
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .section-head { margin-bottom: 24px; }
  .section-head h2 { font-size: 18px; }
  .hero-content h1 { font-size: 24px; }
  .hero-subtitle { font-size: 15px; }
  .hero-desc { font-size: 14px; }
}
@media (max-width: 480px) {
  .hero { padding: 32px 16px; }
  .hot-section, .pick-section, .reviews-section, .news-section, .faq-section, .cta-section { padding-left: 16px; padding-right: 16px; }
}

/* roulang page: category1 */
:root {
            --c-primary: #2E76D6;
            --c-primary-light: #E2EEFA;
            --c-primary-deep: #175CA8;
            --c-accent: #FFB020;
            --c-success: #0FA874;
            --c-bg: #F5F9FD;
            --c-bg-2: #EAF2FA;
            --c-surface: #FFFFFF;
            --c-text: #16283A;
            --c-muted: #5B6B7C;
            --c-border: #D8E6F2;
            --radius-lg: 20px;
            --radius-md: 16px;
            --radius-pill: 999px;
            --shadow-card: 0 6px 24px rgba(22, 40, 58, 0.08);
            --shadow-hover: 0 12px 40px rgba(23, 92, 168, 0.15);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --sidebar-w: 260px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background: var(--c-bg);
            color: var(--c-text);
            line-height: 1.75;
            font-size: 15px;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: var(--c-primary);
            text-decoration: none;
            transition: color .2s ease;
        }

        a:hover {
            color: var(--c-primary-deep);
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-w);
            height: 100vh;
            background: var(--c-surface);
            border-right: 1px solid var(--c-border);
            display: flex;
            flex-direction: column;
            padding: 28px 20px;
            z-index: 100;
        }

        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 12px 24px;
            border-bottom: 1px solid var(--c-border);
            margin-bottom: 20px;
        }

        .brand-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: var(--c-primary);
            color: #fff;
            border-radius: 50%;
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .brand-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--c-text);
            line-height: 1.3;
        }

        .brand-text small {
            display: block;
            font-size: 12px;
            font-weight: 400;
            color: var(--c-muted);
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 6px;
            flex: 1;
        }

        .sidebar-nav .nav-link {
            display: flex;
            align-items: center;
            height: 48px;
            padding: 12px 16px;
            border-radius: 10px;
            font-size: 15px;
            color: var(--c-text);
            font-weight: 500;
            position: relative;
            transition: background .2s ease, color .2s ease;
        }

        .sidebar-nav .nav-link:hover {
            background: var(--c-bg-2);
            color: var(--c-text);
        }

        .sidebar-nav .nav-link.active {
            background: var(--c-primary-light);
            color: var(--c-primary);
            font-weight: 600;
        }

        .sidebar-nav .nav-link.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 4px;
            height: 20px;
            background: var(--c-primary);
            border-radius: 0 4px 4px 0;
        }

        .sidebar-info {
            padding: 16px 12px 0;
            border-top: 1px solid var(--c-border);
            font-size: 13px;
            color: var(--c-muted);
            line-height: 1.6;
        }

        /* ===== Mobile Topbar ===== */
        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: var(--c-surface);
            border-bottom: 1px solid var(--c-border);
            box-shadow: 0 2px 12px rgba(22, 40, 58, 0.06);
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            z-index: 200;
        }

        .mobile-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 700;
            color: var(--c-text);
        }

        .mobile-toggle {
            display: flex;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            justify-content: center;
            align-items: center;
        }

        .mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--c-text);
            border-radius: 2px;
            transition: transform .25s ease, opacity .25s ease;
        }

        .mobile-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 60px;
            left: 0;
            right: 0;
            background: var(--c-surface);
            border-bottom: 1px solid var(--c-border);
            padding: 16px 20px;
            flex-direction: column;
            gap: 4px;
            box-shadow: 0 12px 24px rgba(22, 40, 58, 0.1);
            z-index: 199;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu .nav-link {
            display: flex;
            align-items: center;
            height: 48px;
            padding: 12px 16px;
            border-radius: 10px;
            font-size: 15px;
            color: var(--c-text);
            font-weight: 500;
        }

        .mobile-menu .nav-link:hover {
            background: var(--c-bg-2);
        }

        .mobile-menu .nav-link.active {
            background: var(--c-primary-light);
            color: var(--c-primary);
            font-weight: 600;
        }

        /* ===== Main Content Layout ===== */
        .main-content {
            margin-left: var(--sidebar-w);
            min-height: 100vh;
        }

        /* ===== Hero Section ===== */
        .hero {
            padding: 72px 0 56px;
            background: var(--c-bg);
        }

        .hero-row {
            display: grid;
            grid-template-columns: 1fr 380px;
            gap: 48px;
            align-items: center;
        }

        .hero-text .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--c-primary-light);
            color: var(--c-primary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 20px;
        }

        .hero-text h1 {
            font-size: 42px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 12px;
            color: var(--c-text);
        }

        .hero-text .hero-sub {
            font-size: 18px;
            color: var(--c-muted);
            margin-bottom: 16px;
        }

        .hero-text .hero-desc {
            font-size: 15px;
            color: var(--c-muted);
            margin-bottom: 24px;
            max-width: 520px;
        }

        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 28px;
        }

        .hero-tags .tag {
            background: var(--c-bg-2);
            color: var(--c-text);
            font-size: 13px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--c-primary);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-pill);
            transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
            box-shadow: 0 4px 16px rgba(46, 118, 214, 0.25);
        }

        .btn-primary:hover {
            background: var(--c-primary-deep);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(23, 92, 168, 0.25);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-primary:focus-visible {
            outline: 2px solid var(--c-primary);
            outline-offset: 2px;
        }

        .hero-media {
            border-radius: 24px;
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            position: relative;
        }

        .hero-media img {
            width: 100%;
            height: 480px;
            object-fit: cover;
        }

        .hero-media::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 55%, rgba(22, 40, 58, 0.55));
            pointer-events: none;
        }

        .hero-media .hero-media-tag {
            position: absolute;
            left: 20px;
            bottom: 20px;
            z-index: 1;
            background: rgba(22, 40, 58, 0.75);
            color: #fff;
            font-size: 13px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
        }

        /* ===== Section Common ===== */
        .section {
            padding: 72px 0;
        }

        .section+.section {
            border-top: 1px solid var(--c-border);
        }

        .section-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
        }

        .section-head h2 {
            font-size: 24px;
            font-weight: 700;
            position: relative;
            padding-left: 16px;
        }

        .section-head h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 4px;
            height: 24px;
            background: var(--c-primary);
            border-radius: 2px;
        }

        .section-head .link-more {
            font-size: 14px;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* ===== Hot List ===== */
        .hot-list-wrap {
            background: var(--c-surface);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-card);
        }

        .hot-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 18px 8px;
            border-bottom: 1px solid var(--c-border);
            transition: background .2s ease;
            border-radius: 10px;
        }

        .hot-item:last-child {
            border-bottom: none;
        }

        .hot-item:hover {
            background: var(--c-bg-2);
            padding-left: 16px;
        }

        .hot-rank {
            font-size: 24px;
            font-weight: 800;
            color: var(--c-primary-light);
            font-family: 'Georgia', serif;
            line-height: 1;
            min-width: 48px;
            font-variant-numeric: tabular-nums;
        }

        .hot-rank.hot {
            color: var(--c-accent);
        }

        .hot-info {
            flex: 1;
        }

        .hot-info h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .hot-info p {
            font-size: 13px;
            color: var(--c-muted);
        }

        .hot-tag {
            background: var(--c-primary-light);
            color: var(--c-primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            white-space: nowrap;
        }

        .hot-score {
            font-size: 14px;
            font-weight: 700;
            color: var(--c-muted);
            min-width: 40px;
            text-align: right;
            font-variant-numeric: tabular-nums;
        }

        /* ===== Focus Cards ===== */
        .focus-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .focus-card {
            background: var(--c-surface);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--c-border);
            transition: box-shadow .3s ease, transform .3s ease;
        }

        .focus-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .focus-media {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16/10;
        }

        .focus-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .35s ease;
        }

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

        .focus-label {
            position: absolute;
            top: 12px;
            right: 12px;
            background: var(--c-accent);
            color: var(--c-text);
            font-size: 12px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 6px;
        }

        .focus-body {
            padding: 20px 24px 24px;
        }

        .focus-body .focus-meta {
            font-size: 13px;
            color: var(--c-muted);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .focus-body .focus-meta .dot {
            width: 4px;
            height: 4px;
            background: var(--c-border);
            border-radius: 50%;
        }

        .focus-body h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .focus-body p {
            font-size: 14px;
            color: var(--c-muted);
            margin-bottom: 16px;
        }

        .focus-body a.read-more {
            font-size: 14px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .focus-body a.read-more:hover {
            gap: 8px;
        }

        /* ===== Timeline ===== */
        .timeline-section {
            background: var(--c-bg-2);
        }

        .timeline-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .timeline-item {
            display: flex;
            align-items: center;
            gap: 24px;
            background: var(--c-surface);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            transition: box-shadow .25s ease, border-color .25s ease;
        }

        .timeline-item:hover {
            border-color: var(--c-primary);
            box-shadow: var(--shadow-card);
        }

        .timeline-time {
            min-width: 90px;
            text-align: center;
            padding-right: 20px;
            border-right: 1px solid var(--c-border);
        }

        .timeline-time span {
            display: block;
            font-size: 13px;
            color: var(--c-muted);
            margin-bottom: 4px;
        }

        .timeline-time strong {
            font-size: 20px;
            font-weight: 700;
            font-variant-numeric: tabular-nums;
        }

        .timeline-event {
            flex: 1;
        }

        .timeline-event h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .timeline-event p {
            font-size: 13px;
            color: var(--c-muted);
        }

        .timeline-status {
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            white-space: nowrap;
        }

        .timeline-status.upcoming {
            background: var(--c-primary-light);
            color: var(--c-primary);
        }

        .timeline-status.live {
            background: rgba(15, 168, 116, 0.15);
            color: var(--c-success);
        }

        .timeline-status.finished {
            background: var(--c-bg-2);
            color: var(--c-muted);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--c-border);
            border-radius: 12px;
            margin-bottom: 12px;
            background: var(--c-surface);
            overflow: hidden;
            transition: border-color .25s ease;
        }

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

        .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 24px;
            font-size: 15px;
            font-weight: 600;
            color: var(--c-text);
            text-align: left;
            transition: background .2s ease;
        }

        .faq-q:hover {
            background: var(--c-bg);
        }

        .faq-arrow {
            width: 20px;
            height: 20px;
            border-right: 2px solid var(--c-muted);
            border-bottom: 2px solid var(--c-muted);
            transform: rotate(45deg);
            transition: transform .25s ease;
            flex-shrink: 0;
            margin-top: -6px;
        }

        .faq-item.open .faq-arrow {
            transform: rotate(225deg);
            margin-top: 6px;
            border-color: var(--c-primary);
        }

        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s ease;
            padding: 0 24px;
        }

        .faq-item.open .faq-a {
            max-height: 300px;
            padding-bottom: 18px;
        }

        .faq-a p {
            font-size: 14px;
            color: var(--c-muted);
            line-height: 1.7;
            border-top: 1px solid var(--c-border);
            padding-top: 14px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 72px 0;
        }

        .cta-box {
            background: linear-gradient(135deg, var(--c-primary), var(--c-primary-deep));
            border-radius: 24px;
            padding: 56px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cta-box h2 {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-box p {
            font-size: 15px;
            opacity: 0.9;
            margin-bottom: 28px;
            max-width: 480px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-white {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: #fff;
            color: var(--c-primary);
            font-size: 15px;
            font-weight: 600;
            padding: 14px 40px;
            border-radius: var(--radius-pill);
            min-width: 260px;
            height: 56px;
            transition: transform .2s ease, box-shadow .2s ease;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
        }

        .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(0, 0, 0, 0.2);
            color: var(--c-primary-deep);
        }

        .btn-white:active {
            transform: translateY(0);
        }

        .btn-white:focus-visible {
            outline: 2px solid #fff;
            outline-offset: 2px;
        }

        /* ===== Footer ===== */
        .footer {
            margin-left: var(--sidebar-w);
            background: var(--c-text);
            color: rgba(255, 255, 255, 0.8);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 48px 40px 32px;
        }

        .footer-brand .footer-brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--c-primary);
            color: #fff;
            border-radius: 50%;
            font-size: 16px;
            font-weight: 700;
            margin-right: 10px;
            vertical-align: middle;
        }

        .footer-brand strong {
            font-size: 17px;
            color: #fff;
            vertical-align: middle;
        }

        .footer-brand p {
            font-size: 13px;
            margin-top: 12px;
            line-height: 1.7;
            opacity: 0.75;
        }

        .footer-col h3 {
            font-size: 14px;
            color: #fff;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.7);
            font-size: 13px;
            margin-bottom: 8px;
            transition: color .2s ease;
        }

        .footer-col a:hover {
            color: #fff;
        }

        .footer-col p {
            font-size: 13px;
            line-height: 1.6;
            opacity: 0.7;
            margin-bottom: 8px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 40px;
            text-align: center;
            font-size: 12px;
            opacity: 0.7;
        }

        .footer-bottom p {
            max-width: 1200px;
            margin: 0 auto;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .sidebar {
                display: none;
            }

            .mobile-topbar {
                display: flex;
            }

            .main-content {
                margin-left: 0;
                padding-top: 60px;
            }

            .footer {
                margin-left: 0;
            }

            .container {
                padding: 0 24px;
            }

            .hero {
                padding: 48px 0 40px;
            }

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

            .hero-media img {
                height: 320px;
            }
        }

        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }

            .hero-text h1 {
                font-size: 28px;
            }

            .hero-text .hero-sub {
                font-size: 16px;
            }

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

            .hot-list-wrap {
                padding: 20px;
            }

            .hot-item {
                flex-wrap: wrap;
                gap: 10px;
            }

            .hot-rank {
                min-width: 34px;
                font-size: 20px;
            }

            .timeline-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }

            .timeline-time {
                border-right: none;
                border-bottom: 1px solid var(--c-border);
                padding-right: 0;
                padding-bottom: 8px;
                min-width: 100%;
                text-align: left;
                display: flex;
                align-items: center;
                gap: 8px;
            }

            .timeline-time span {
                margin-bottom: 0;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                padding: 36px 24px 24px;
            }

            .footer-bottom {
                padding: 16px 24px;
            }

            .cta-box {
                padding: 40px 24px;
            }

            .cta-box h2 {
                font-size: 22px;
            }

            .btn-white {
                min-width: 200px;
                width: 100%;
                max-width: 280px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 16px;
            }

            .section-head {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }

            .section-head h2 {
                font-size: 20px;
            }

            .hero-text h1 {
                font-size: 24px;
            }

            .hero-media img {
                height: 240px;
            }

            .hot-list-wrap {
                padding: 16px;
            }

            .focus-body {
                padding: 16px;
            }

            .focus-body h3 {
                font-size: 16px;
            }

            .faq-q {
                padding: 14px 16px;
                font-size: 14px;
            }

            .faq-a {
                padding: 0 16px;
            }

            .faq-item.open .faq-a {
                padding-bottom: 14px;
            }

            .footer-bottom p {
                font-size: 11px;
            }
        }

/* roulang page: article */
:root {
            --c-primary: #2E76D6;
            --c-primary-light: #E2EEFA;
            --c-primary-deep: #175CA8;
            --c-accent: #FFB020;
            --c-success: #0FA874;
            --c-bg: #F5F9FD;
            --c-bg-2: #EAF2FA;
            --c-surface: #FFFFFF;
            --c-text: #16283A;
            --c-muted: #5B6B7C;
            --c-border: #D8E6F2;
            --radius-lg: 20px;
            --radius-md: 16px;
            --radius-pill: 999px;
            --shadow-card: 0 6px 24px rgba(22,40,58,0.08);
            --shadow-hover: 0 12px 40px rgba(23,92,168,0.15);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
        body {
            font-family: var(--font-family);
            font-size: 15px;
            line-height: 1.75;
            color: var(--c-text);
            background: var(--c-bg);
            display: flex;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; display: block; }
        a { color: var(--c-primary); text-decoration: none; transition: color 0.2s ease; }
        a:hover { color: var(--c-primary-deep); }
        button { font-family: inherit; cursor: pointer; border: none; background: none; }
        ul, ol { padding-left: 1.25rem; }

        /* -------- 侧边导航 -------- */
        .sidebar {
            width: 260px;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            background: var(--c-surface);
            border-right: 1px solid var(--c-border);
            display: flex;
            flex-direction: column;
            padding: 24px 20px;
            z-index: 100;
        }
        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 4px 24px;
            border-bottom: 1px solid var(--c-border);
            margin-bottom: 20px;
        }
        .brand-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--c-primary);
            color: #fff;
            font-size: 20px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .brand-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--c-text);
            letter-spacing: 0.5px;
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
        }
        .nav-link {
            display: flex;
            align-items: center;
            height: 48px;
            padding: 0 16px;
            border-radius: 10px;
            color: var(--c-text);
            font-size: 15px;
            font-weight: 500;
            position: relative;
            transition: background 0.2s, color 0.2s;
        }
        .nav-link:hover { background: var(--c-bg-2); color: var(--c-text); }
        .nav-link:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }
        .nav-link.active { background: var(--c-primary-light); color: var(--c-primary); font-weight: 600; }
        .nav-link.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 4px;
            height: 20px;
            border-radius: 4px;
            background: var(--c-primary);
        }
        .sidebar-foot {
            padding-top: 16px;
            border-top: 1px solid var(--c-border);
            font-size: 13px;
            color: var(--c-muted);
            line-height: 1.6;
        }

        /* -------- 移动端顶栏 -------- */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 200;
            height: 60px;
            background: var(--c-surface);
            border-bottom: 1px solid var(--c-border);
            align-items: center;
            padding: 0 16px;
            gap: 12px;
            box-shadow: 0 2px 12px rgba(22, 40, 58, 0.06);
        }
        .menu-btn {
            display: flex;
            flex-direction: column;
            gap: 5px;
            width: 36px;
            height: 36px;
            align-items: center;
            justify-content: center;
            background: var(--c-bg);
            border: 1px solid var(--c-border);
            border-radius: 10px;
            transition: background 0.2s;
        }
        .menu-btn:hover { background: var(--c-bg-2); }
        .menu-btn span {
            display: block;
            width: 18px;
            height: 2px;
            background: var(--c-text);
            border-radius: 2px;
            transition: transform 0.2s, opacity 0.2s;
        }
        .menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
        .menu-btn.open span:nth-child(2) { opacity: 0; }
        .menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
        .mobile-brand { display: flex; align-items: center; gap: 10px; }
        .mobile-brand .brand-text { font-size: 18px; }
        .mobile-menu {
            position: absolute;
            top: 60px;
            left: 0;
            right: 0;
            background: var(--c-surface);
            border-bottom: 1px solid var(--c-border);
            padding: 12px 16px 20px;
            display: none;
            box-shadow: 0 12px 24px rgba(22, 40, 58, 0.06);
        }
        .mobile-menu.open { display: block; }
        .mobile-nav { display: flex; flex-direction: column; gap: 6px; }
        .mobile-nav .nav-link { height: 44px; }

        /* -------- 主内容区 -------- */
        .page-shell {
            margin-left: 260px;
            flex: 1;
            display: flex;
            flex-direction: column;
            min-width: 0;
            min-height: 100vh;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 48px 40px;
            width: 100%;
        }

        /* -------- 面包屑 -------- */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--c-muted);
            margin-bottom: 24px;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb a { color: var(--c-muted); transition: color 0.2s; }
        .breadcrumb a:hover { color: var(--c-primary); }
        .breadcrumb .divider { color: #A0B0C0; font-style: normal; }
        .breadcrumb .current { color: var(--c-text); font-weight: 500; }

        /* -------- 文章卡片 -------- */
        .article-card {
            background: var(--c-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--c-border);
            box-shadow: var(--shadow-card);
            padding: 48px;
            margin-bottom: 32px;
        }
        .article-header {
            border-bottom: 1px solid var(--c-border);
            padding-bottom: 24px;
            margin-bottom: 24px;
        }
        .article-header h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--c-text);
        }
        .article-meta {
            display: flex;
            gap: 12px 20px;
            font-size: 13px;
            color: var(--c-muted);
            flex-wrap: wrap;
            align-items: center;
        }
        .article-meta .badge {
            background: var(--c-primary-light);
            color: var(--c-primary);
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            font-size: 12px;
            font-weight: 600;
        }
        .article-meta .meta-sep { color: #A0B0C0; }

        /* -------- 正文排版 -------- */
        .article-content {
            font-size: 16px;
            line-height: 1.8;
            color: var(--c-text);
        }
        .article-content > * + * { margin-top: 0; }
        .article-content p { margin-bottom: 20px; }
        .article-content h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 40px 0 16px;
            line-height: 1.4;
            color: var(--c-text);
        }
        .article-content h3 {
            font-size: 20px;
            font-weight: 600;
            margin: 32px 0 12px;
            line-height: 1.5;
        }
        .article-content h4 {
            font-size: 17px;
            font-weight: 600;
            margin: 24px 0 10px;
        }
        .article-content ul,
        .article-content ol { margin: 0 0 20px; padding-left: 24px; }
        .article-content li { margin-bottom: 8px; }
        .article-content a {
            color: var(--c-primary);
            text-decoration: underline;
            text-underline-offset: 3px;
            text-decoration-color: rgba(46, 118, 214, 0.35);
        }
        .article-content a:hover { color: var(--c-primary-deep); }
        .article-content blockquote {
            border-left: 4px solid var(--c-primary);
            background: var(--c-bg);
            padding: 16px 20px;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 24px 0;
            color: var(--c-muted);
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 24px 0;
            box-shadow: var(--shadow-card);
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 15px;
        }
        .article-content th,
        .article-content td {
            border: 1px solid var(--c-border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-content th { background: var(--c-bg-2); font-weight: 600; }
        .article-content pre {
            background: #1E293B;
            color: #E2E8F0;
            padding: 16px 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 24px 0;
            font-size: 14px;
            line-height: 1.6;
        }
        .article-content code {
            background: var(--c-bg-2);
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 0.92em;
        }
        .article-content pre code { background: none; padding: 0; color: inherit; }

        /* -------- 标签区 -------- */
        .article-tags {
            display: flex;
            gap: 10px;
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--c-border);
            flex-wrap: wrap;
        }
        .tag {
            background: var(--c-bg-2);
            border-radius: var(--radius-pill);
            padding: 6px 14px;
            font-size: 13px;
            color: var(--c-text);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .tag::before { content: '#'; color: var(--c-primary); font-weight: 600; }

        /* -------- 上一篇 / 下一篇 -------- */
        .article-pager {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 24px;
        }
        .pager-link {
            display: flex;
            flex-direction: column;
            padding: 16px 20px;
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            background: var(--c-surface);
            transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
            min-width: 0;
        }
        .pager-link:hover {
            border-color: var(--c-primary);
            box-shadow: var(--shadow-hover);
            color: var(--c-text);
            transform: translateY(-2px);
        }
        .pager-link:active { transform: translateY(0); }
        .pager-link:focus-visible {
            outline: 2px solid var(--c-primary);
            outline-offset: 3px;
        }
        .pager-label {
            font-size: 12px;
            color: var(--c-muted);
            margin-bottom: 4px;
            letter-spacing: 0.5px;
        }
        .pager-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--c-text);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* -------- 相关推荐 -------- */
        .related-section {
            margin-bottom: 32px;
        }
        .related-section h2 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--c-text);
        }
        .related-desc {
            font-size: 14px;
            color: var(--c-muted);
            margin-bottom: 24px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--c-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--c-border);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--c-primary);
        }
        .related-card:focus-visible {
            outline: 2px solid var(--c-primary);
            outline-offset: 3px;
        }
        .related-card img {
            width: 100%;
            aspect-ratio: 3 / 2;
            object-fit: cover;
            transition: transform 0.3s ease;
        }
        .related-card:hover img { transform: scale(1.03); }
        .related-card-body {
            padding: 20px 24px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .related-card .badge {
            align-self: flex-start;
            background: var(--c-primary-light);
            color: var(--c-primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: var(--radius-pill);
            margin-bottom: 10px;
        }
        .related-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--c-text);
            line-height: 1.4;
        }
        .related-card p {
            font-size: 13px;
            color: var(--c-muted);
            line-height: 1.6;
        }

        /* -------- 按钮 -------- */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-pill);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--c-primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--c-primary-deep);
            transform: translateY(-2px);
            color: #fff;
            box-shadow: 0 8px 24px rgba(23, 92, 168, 0.25);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: none; }
        .btn-primary:focus-visible {
            outline: 2px solid var(--c-primary);
            outline-offset: 3px;
        }

        /* -------- 空态 -------- */
        .not-found {
            background: var(--c-surface);
            border: 1px dashed var(--c-border);
            border-radius: var(--radius-lg);
            padding: 80px 32px;
            text-align: center;
            box-shadow: var(--shadow-card);
        }
        .not-found h1 { font-size: 28px; margin-bottom: 12px; color: var(--c-text); }
        .not-found p { color: var(--c-muted); margin-bottom: 24px; }

        /* -------- 返回首页 -------- */
        .back-home {
            text-align: center;
            padding: 24px 0 8px;
        }

        /* -------- 页脚 -------- */
        .footer {
            background: var(--c-text);
            color: rgba(255, 255, 255, 0.85);
            padding: 48px 40px 24px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 32px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-brand-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--c-accent);
            color: var(--c-text);
            font-size: 20px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .footer-brand strong {
            font-size: 20px;
            color: #fff;
            font-weight: 700;
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.7;
            opacity: 0.8;
        }
        .footer-col h3 {
            font-size: 15px;
            color: #fff;
            margin-bottom: 14px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.7);
            padding: 6px 0;
            font-size: 14px;
            transition: color 0.2s, padding-left 0.2s;
        }
        .footer-col a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-col p {
            font-size: 13px;
            opacity: 0.75;
            line-height: 1.7;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            text-align: center;
            padding-top: 20px;
            margin-top: 32px;
            font-size: 12px;
            opacity: 0.7;
        }

        /* -------- 响应式 -------- */
        @media (max-width: 1024px) {
            body { display: block; }
            .sidebar { display: none; }
            .page-shell { margin-left: 0; }
            .mobile-header { display: flex; }
            .container { padding: 32px 24px; }
            .related-grid { grid-template-columns: repeat(3, 1fr); }
        }
        @media (max-width: 768px) {
            .container { padding: 24px 16px; }
            .article-card { padding: 28px 20px; }
            .article-header h1 { font-size: 24px; }
            .article-content h2 { font-size: 20px; }
            .article-content h3 { font-size: 18px; }
            .related-grid { grid-template-columns: 1fr; }
            .related-section h2 { font-size: 20px; }
            .article-pager { grid-template-columns: 1fr; }
            .footer { padding: 40px 20px 20px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
        }
        @media (max-width: 520px) {
            .container { padding: 16px; }
            .article-card { padding: 20px 16px; }
            .article-header h1 { font-size: 22px; }
            .article-meta { gap: 8px 12px; font-size: 12px; }
            .footer-grid { grid-template-columns: 1fr; gap: 20px; }
            .footer { padding: 32px 16px 16px; }
            .breadcrumb { font-size: 13px; }
            .back-home .btn { width: 100%; }
        }

/* roulang page: category3 */
:root {
  --c-primary: #2E76D6;
  --c-primary-light: #E2EEFA;
  --c-primary-deep: #175CA8;
  --c-accent: #FFB020;
  --c-success: #0FA874;
  --c-bg: #F5F9FD;
  --c-bg-2: #EAF2FA;
  --c-surface: #FFFFFF;
  --c-text: #16283A;
  --c-muted: #5B6B7C;
  --c-border: #D8E6F2;
  --radius-main: 20px;
  --radius-card: 16px;
  --radius-btn: 999px;
  --radius-input: 12px;
  --shadow-card: 0 6px 24px rgba(22,40,58,0.08);
  --shadow-hover: 0 12px 40px rgba(23,92,168,0.15);
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-num: tabular-nums;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }
h1 { font-size: 32px; font-weight: 700; line-height: 1.2; }
h2 { font-size: 22px; font-weight: 700; line-height: 1.4; }
h3 { font-size: 18px; font-weight: 600; line-height: 1.5; }
p { margin: 0; }

/* layout */
.app-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 100;
}
.main-content {
  flex: 1;
  min-width: 0;
  padding: 0 40px;
  max-width: 1200px;
  margin: 0 auto;
}

/* brand */
.brand-area {
  padding: 28px 20px 24px;
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-icon {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.brand-name { font-size: 18px; font-weight: 700; color: var(--c-text); line-height: 1.2; }

/* nav */
.sidebar-nav { padding: 20px 14px; flex: 1; display: flex; flex-direction: column; gap: 4px; }
.nav-link {
  display: flex;
  align-items: center;
  height: 48px;
  padding: 0 18px;
  border-radius: 10px;
  font-size: 15px;
  color: var(--c-text);
  position: relative;
  transition: background .2s, color .2s;
}
.nav-link:hover { background: var(--c-bg-2); }
.nav-link.active {
  background: var(--c-primary-light);
  color: var(--c-primary);
  font-weight: 600;
}
.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 22px;
  border-radius: 0 4px 4px 0;
  background: var(--c-primary);
}
.nav-link:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}

/* sidebar bottom */
.sidebar-info {
  padding: 16px 20px;
  border-top: 1px solid var(--c-border);
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.6;
}

/* mobile header */
.mobile-header {
  display: none;
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--c-surface);
  height: 60px;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  box-shadow: 0 2px 12px rgba(22,40,58,0.08);
}
.mobile-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.mobile-burger {
  width: 40px; height: 40px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 5px;
  border: none;
  background: transparent;
  border-radius: 8px;
}
.mobile-burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform .3s, opacity .3s;
}
.mobile-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-burger.open span:nth-child(2) { opacity: 0; }
.mobile-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--c-surface);
  padding: 20px;
  z-index: 150;
  overflow-y: auto;
  flex-direction: column;
  gap: 4px;
}
.mobile-menu.open { display: flex; }

/* page hero (category3 specific) */
.cat3-hero {
  padding: 72px 0 48px;
}
.cat3-hero h1 {
  max-width: 640px;
}
.cat3-hero .hero-sub {
  font-size: 16px;
  color: var(--c-muted);
  max-width: 560px;
  margin-top: 16px;
}

/* banner */
.banner-strip {
  background: linear-gradient(98deg, var(--c-primary) 0%, #1f66c0 100%);
  border-radius: var(--radius-main);
  padding: 32px 40px;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 24px;
  box-shadow: 0 8px 30px rgba(46,118,214,0.25);
}
.banner-strip h2 { font-size: 24px; }
.banner-strip p { font-size: 14px; opacity: .92; margin-top: 6px; max-width: 420px; }
.banner-pill {
  background: #fff;
  color: var(--c-primary);
  padding: 12px 28px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 15px;
  display: inline-block;
  transition: transform .2s, box-shadow .2s;
}
.banner-pill:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,255,255,0.25); }
.banner-pill:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }

/* section */
.section {
  padding: 40px 0 72px;
}
.section h2 {
  margin-bottom: 8px;
  position: relative;
}
.section-title-line {
  width: 36px; height: 4px;
  background: var(--c-accent);
  border-radius: 4px;
  margin-bottom: 8px;
}
.section-desc {
  color: var(--c-muted);
  font-size: 15px;
  max-width: 520px;
  margin-bottom: 28px;
}

/* accordion for category3 */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 860px;
}
.accordion-item {
  border: 1px solid var(--c-border);
  border-radius: 12px;
  background: var(--c-surface);
  overflow: hidden;
  transition: border-color .25s, box-shadow .25s;
}
.accordion-item.open {
  border-color: var(--c-primary);
  box-shadow: 0 4px 16px rgba(46,118,214,0.12);
}
.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: transparent;
  border: none;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-text);
}
.accordion-trigger .acc-arrow {
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  transition: transform .3s;
  font-size: 18px;
  color: var(--c-muted);
}
.accordion-item.open .accordion-trigger .acc-arrow {
  transform: rotate(45deg);
  color: var(--c-primary);
}
.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}
.accordion-content-inner {
  padding: 0 24px 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
  border-top: 1px solid var(--c-border);
  padding-top: 16px;
}
.accordion-item.open .accordion-content {
  max-height: 500px;
}

/* step-flow for entry scene */
.steps-row {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.step-card {
  flex: 1;
  min-width: 200px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  position: relative;
  transition: box-shadow .25s, transform .25s;
}
.step-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.step-num {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-primary);
}
.step-line {
  width: 28px; height: 2px;
  background: var(--c-accent);
  margin: 10px 0 14px;
}
.step-card h3 { font-size: 17px; margin-bottom: 10px; }
.step-card p { font-size: 14px; color: var(--c-muted); }

/* content grid mini cards */
.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.mini-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--c-border);
  transition: box-shadow .25s, transform .25s;
}
.mini-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.mini-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.mini-card-body { padding: 20px 24px; }
.mini-card-body h3 { font-size: 16px; margin-bottom: 8px; }
.mini-card-body p { font-size: 14px; color: var(--c-muted); }
.mini-card-badge {
  display: inline-block;
  background: var(--c-primary-light);
  color: var(--c-primary);
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 10px;
}

/* CTA */
.cta-block {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-deep) 100%);
  border-radius: var(--radius-main);
  padding: 56px 40px;
  text-align: center;
  color: #fff;
  margin: 0 0 72px;
}
.cta-block h2 { font-size: 26px; }
.cta-block p { font-size: 15px; opacity: .92; margin: 12px auto 28px; max-width: 420px; }
.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 260px;
  height: 56px;
  background: #fff;
  color: var(--c-primary-deep);
  border-radius: var(--radius-btn);
  font-size: 16px;
  font-weight: 600;
  transition: transform .2s, box-shadow .2s;
}
.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0,0,0,0.2);
}
.cta-btn:active { transform: translateY(0); }
.cta-btn:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }

/* footer */
.footer {
  background: var(--c-text);
  color: rgba(255,255,255,0.9);
  padding: 56px 40px 24px;
  margin-left: 260px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}
.footer-brand h3, .footer-col h3 {
  font-size: 16px;
  margin-bottom: 16px;
  color: #fff;
}
.footer-brand p, .footer-col p {
  font-size: 14px;
  color: rgba(255,255,255,0.72);
  line-height: 1.7;
}
.footer-brand-icon {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--c-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}
.footer-brand strong { font-size: 18px; font-weight: 700; color: #fff; }
.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.72);
  margin-bottom: 8px;
  transition: color .2s;
}
.footer-col a:hover { color: #fff; }
.footer-col a:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.2);
  font-size: 12px;
  color: rgba(255,255,255,0.6);
}

/* responsive */
@media (max-width: 1024px) {
  .sidebar { display: none; }
  .mobile-header { display: flex; }
  .main-content { padding: 0 24px; }
  .footer { margin-left: 0; padding: 48px 24px 24px; }
  .cat3-hero { padding: 48px 0 32px; }
  .section { padding: 32px 0 48px; }
  .cta-block { margin-bottom: 48px; }
}

@media (max-width: 768px) {
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  .main-content { padding: 0 16px; }
  .banner-strip { padding: 24px; flex-direction: column; align-items: flex-start; }
  .mini-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .cat3-hero { padding: 40px 0 24px; }
  .section { padding: 24px 0 40px; }
  .cta-block { padding: 40px 24px; margin-bottom: 40px; }
  .steps-row { flex-direction: column; }
  .step-card { min-width: 100%; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer { padding: 40px 16px 20px; }
  .cta-btn { width: 100%; min-width: 0; }
  .banner-strip { padding: 20px; }
  .accordion-trigger { padding: 16px 18px; font-size: 15px; }
  .accordion-content-inner { padding: 0 18px 18px; }
}

/* roulang page: category2 */
:root {
  --c-primary: #2E76D6;
  --c-primary-light: #E2EEFA;
  --c-primary-deep: #175CA8;
  --c-accent: #FFB020;
  --c-success: #0FA874;
  --c-bg: #F5F9FD;
  --c-bg-2: #EAF2FA;
  --c-surface: #FFFFFF;
  --c-text: #16283A;
  --c-muted: #5B6B7C;
  --c-border: #D8E6F2;
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --shadow-card: 0 6px 24px rgba(22,40,58,0.08);
  --shadow-hover: 0 12px 40px rgba(23,92,168,0.15);
  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul, ol {
  list-style: none;
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* ===== 左侧导航 ===== */
.sidebar {
  width: 260px;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
  z-index: 100;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 8px 20px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 20px;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  flex-shrink: 0;
}

.brand-text {
  font-weight: 700;
  font-size: 18px;
  color: var(--c-text);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 48px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 15px;
  color: var(--c-text);
  transition: background 0.2s ease, color 0.2s ease;
  position: relative;
}

.nav-link:hover {
  background: var(--c-bg-2);
}

.nav-link.active {
  background: var(--c-primary-light);
  color: var(--c-primary);
  font-weight: 600;
}

.nav-link.active::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 24px;
  border-radius: 0 4px 4px 0;
  background: var(--c-primary);
}

.sidebar-footer {
  padding: 16px 8px 4px;
  border-top: 1px solid var(--c-border);
}

.sidebar-footer p {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.5;
}

/* ===== 右侧主区域 ===== */
.main-area {
  flex: 1;
  margin-left: 260px;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.main-content {
  padding: 0 40px;
  flex: 1;
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 0;
}

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

.section-head h2 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-text);
}

.section-head p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--c-muted);
  line-height: 1.7;
}

/* ===== 简化 Hero ===== */
.category-hero {
  position: relative;
  max-width: 1200px;
  margin: 32px auto 0;
  height: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.category-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(22, 40, 58, 0.92) 0%, rgba(23, 92, 168, 0.6) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 40px 48px;
  max-width: 640px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  background: var(--c-accent);
  color: var(--c-text);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
}

.category-hero h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 12px;
}

.category-hero p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.92);
  line-height: 1.7;
}

/* ===== 竖屏视频卡网格 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.video-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--c-surface);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  border: 1px solid var(--c-border);
}

.video-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.video-thumb {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.video-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--c-accent);
  color: var(--c-text);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  line-height: 1.4;
}

.video-duration {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(22, 40, 58, 0.7);
  color: #fff;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 6px;
  font-variant-numeric: tabular-nums;
}

.video-play {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease;
}

.video-card:hover .video-play {
  background: var(--c-primary);
  color: #fff;
}

.video-info {
  padding: 20px 20px 24px;
}

.video-info h3 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 6px;
}

.video-info p {
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.6;
}

/* ===== 步骤区 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.step-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  padding: 0 10px;
  border-radius: 10px;
  background: var(--c-primary-light);
  color: var(--c-primary);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.step-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.7;
}

/* ===== 设备适配区 ===== */
.device-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.device-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.device-image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.device-content h2 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.device-content > p {
  font-size: 15px;
  color: var(--c-muted);
  margin-bottom: 24px;
  line-height: 1.7;
}

.device-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.device-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  background: var(--c-bg-2);
  border-radius: var(--radius-sm);
  transition: background 0.2s ease;
}

.device-list li:hover {
  background: var(--c-primary-light);
}

.device-dot {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-primary);
  margin-top: 8px;
}

.device-list strong {
  display: block;
  font-size: 15px;
  margin-bottom: 2px;
}

.device-list span {
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.6;
}

/* ===== 小贴士区 ===== */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tip-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.tip-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.tip-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--c-primary-light);
  color: var(--c-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 14px;
}

.tip-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.tip-card p {
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.7;
}

/* ===== CTA 区 ===== */
.cta-box {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-deep) 100%);
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box h2 {
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.3;
}

.cta-box p {
  font-size: 15px;
  opacity: 0.92;
  margin-bottom: 28px;
  line-height: 1.7;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 260px;
  height: 56px;
  padding: 0 36px;
  border-radius: var(--radius-pill);
  background: #fff;
  color: var(--c-primary);
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
}

.btn-cta:active {
  transform: translateY(0);
}

.btn-cta:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* ===== FAQ 区 ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item[open] {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-hover);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  color: var(--c-text);
  transition: background 0.2s ease;
}

.faq-item summary:hover {
  background: var(--c-bg-2);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-primary-light);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 600;
  transition: transform 0.3s ease, background 0.3s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
  background: var(--c-primary);
  color: #fff;
}

.faq-body {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.7;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--c-text);
  color: rgba(255, 255, 255, 0.8);
  padding: 56px 40px 24px;
  margin-top: 24px;
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--c-accent);
  color: var(--c-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
}

.footer-brand strong {
  font-size: 18px;
  color: #fff;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
  opacity: 0.75;
  max-width: 260px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h3 {
  font-size: 15px;
  color: #fff;
  margin-bottom: 6px;
}

.footer-col a {
  font-size: 14px;
  opacity: 0.8;
  transition: opacity 0.2s ease, padding-left 0.2s ease;
}

.footer-col a:hover {
  opacity: 1;
  padding-left: 4px;
}

.footer-col p {
  font-size: 13px;
  opacity: 0.75;
  line-height: 1.7;
}

.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 12px;
  opacity: 0.7;
  text-align: center;
}

/* ===== 移动端顶栏 ===== */
.mobile-header {
  display: none;
  align-items: center;
  gap: 12px;
  height: 60px;
  padding: 0 20px;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  box-shadow: 0 2px 12px rgba(22, 40, 58, 0.06);
  position: sticky;
  top: 0;
  z-index: 200;
}

.menu-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 8px;
  transition: background 0.2s ease;
}

.menu-toggle:hover {
  background: var(--c-bg-2);
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 17px;
  color: var(--c-text);
}

.brand-icon-mini {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}

.mobile-panel {
  display: none;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  padding: 8px 16px 16px;
  box-shadow: 0 8px 24px rgba(22, 40, 58, 0.08);
}

.mobile-panel.open {
  display: block;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 12px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--c-text);
  transition: background 0.2s ease;
}

.mobile-nav-link:hover {
  background: var(--c-bg-2);
}

.mobile-nav-link.active {
  background: var(--c-primary-light);
  color: var(--c-primary);
  font-weight: 600;
}

/* ===== 响应式断点 ===== */
@media (max-width: 1024px) {
  .sidebar {
    display: none;
  }

  .main-area {
    margin-left: 0;
  }

  .mobile-header {
    display: flex;
  }

  .main-content {
    padding: 0 24px;
  }

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

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

@media (max-width: 768px) {
  .section {
    padding: 48px 0;
  }

  .section-head {
    margin-bottom: 32px;
  }

  .category-hero {
    height: 220px;
    margin-top: 20px;
  }

  .hero-content {
    padding: 24px;
  }

  .category-hero h1 {
    font-size: 24px;
  }

  .category-hero p {
    font-size: 14px;
  }

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

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

  .device-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .device-image img {
    height: 280px;
  }

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

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

  .cta-box {
    padding: 48px 24px;
  }

  .cta-box h2 {
    font-size: 22px;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 0 16px;
  }

  .footer {
    padding: 40px 16px 20px;
  }

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

  .btn-cta {
    min-width: 220px;
    width: 100%;
  }

  .category-hero {
    height: 200px;
  }

  .hero-tag {
    font-size: 12px;
    padding: 4px 12px;
  }
}