/* roulang page: index */
:root {
  --bg-primary: #0a0e17;
  --bg-card: #111827;
  --bg-deep: #05070d;
  --bg-soft: #1a1f2e;
  --accent: #00e5ff;
  --accent-dim: rgba(0,229,255,0.18);
  --aux: #8b5cf6;
  --pink: #ff2d95;
  --text-main: #e8eaf2;
  --text-dim: #94a3b8;
  --text-faint: #64748b;
  --border: rgba(255,255,255,0.08);
  --border-light: rgba(255,255,255,0.14);
  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 20px 50px rgba(0,0,0,0.45);
  --shadow-sm: 0 6px 20px rgba(0,0,0,0.3);
  --glow: 0 0 24px rgba(0,229,255,0.35);
  --glow-pink: 0 0 24px rgba(255,45,149,0.25);
  --space-section: 90px;
  --container: 1200px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color .25s; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--space-section) 0; }
.section-lab { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); background: var(--accent-dim); border: 1px solid rgba(0,229,255,0.3); padding: 6px 16px; border-radius: 100px; margin-bottom: 18px; }
.section-title { font-size: clamp(28px, 4vw, 42px); font-weight: 800; line-height: 1.25; letter-spacing: -0.5px; color: #fff; margin-bottom: 14px; background: linear-gradient(135deg, #fff 60%, var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.section-desc { font-size: 16px; color: var(--text-dim); max-width: 720px; margin-bottom: 44px; }

/* ===== Header/Nav ===== */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 999; background: rgba(7,10,18,0.88); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); transition: all .3s ease; }
.site-header.scrolled { background: rgba(5,7,13,0.95); box-shadow: 0 10px 40px rgba(0,0,0,0.6); border-bottom-color: rgba(0,229,255,0.2); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 22px; font-weight: 900; letter-spacing: -0.5px; color: #fff; white-space: nowrap; }
.logo .logo-badge { width: 34px; height: 34px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), var(--aux)); display: flex; align-items: center; justify-content: center; font-size: 16px; color: #0a0e17; box-shadow: var(--glow); }
.logo .logo-text { background: linear-gradient(135deg, #fff 50%, var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo .logo-sub { font-size: 12px; color: var(--text-dim); font-weight: 400; margin-left: 2px; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.nav-link { position: relative; display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: 10px; font-size: 15px; font-weight: 600; color: var(--text-dim); transition: all .3s ease; letter-spacing: 0.2px; }
.nav-link i { font-size: 14px; opacity: .7; }
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.nav-link.active { color: var(--accent); background: var(--accent-dim); text-shadow: 0 0 18px rgba(0,229,255,0.5); }
.nav-link.active::after { content: ''; position: absolute; left: 18px; right: 18px; bottom: 2px; height: 2px; border-radius: 2px; background: var(--accent); box-shadow: var(--glow); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 12px; font-weight: 700; font-size: 15px; transition: all .3s ease; border: 1px solid transparent; cursor: pointer; }
.btn-primary { background: linear-gradient(135deg, var(--accent), #00b4d8); color: #0a0e17; padding: 12px 28px; box-shadow: 0 4px 20px rgba(0,229,255,0.25); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,229,255,0.45); }
.btn-ghost { border: 1px solid var(--border-light); color: #fff; padding: 12px 24px; background: rgba(255,255,255,0.03); backdrop-filter: blur(8px); }
.btn-ghost:hover { border-color: rgba(0,229,255,0.5); color: var(--accent); background: var(--accent-dim); transform: translateY(-2px); }
.btn-sm { padding: 8px 18px; font-size: 14px; border-radius: 10px; }
.nav-toggle { display: none; font-size: 22px; color: #fff; width: 42px; height: 42px; border-radius: 10px; background: rgba(255,255,255,0.06); align-items: center; justify-content: center; }
.mobile-menu { position: fixed; top: 70px; left: 0; right: 0; z-index: 998; background: rgba(7,10,18,0.98); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); padding: 20px 24px; display: none; flex-direction: column; gap: 10px; }
.mobile-menu.open { display: flex; }
.mobile-menu a { padding: 14px 16px; border-radius: 12px; font-size: 16px; font-weight: 600; color: var(--text-dim); background: rgba(255,255,255,0.03); }
.mobile-menu a:hover { background: rgba(255,255,255,0.08); color: #fff; }
.mobile-menu a.active { color: var(--accent); background: var(--accent-dim); }

/* ===== Hero ===== */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; padding: 130px 0 90px; background: linear-gradient(135deg, rgba(5,7,13,0.92) 20%, rgba(10,14,23,0.75) 60%, rgba(0,229,255,0.12)), url('/assets/images/backpic/back-1.png') center center/cover no-repeat; overflow: hidden; }
.hero::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px; background: linear-gradient(to top, var(--bg-primary), transparent); }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center; position: relative; z-index: 2; }
.hero-tag { display: inline-flex; align-items: center; gap: 10px; background: rgba(0,229,255,0.12); border: 1px solid rgba(0,229,255,0.25); color: var(--accent); padding: 8px 18px; border-radius: 100px; font-size: 14px; font-weight: 600; margin-bottom: 24px; box-shadow: 0 0 30px rgba(0,229,255,0.15); }
.hero-tag i { font-size: 12px; }
.hero h1 { font-size: clamp(34px, 5.5vw, 58px); font-weight: 900; line-height: 1.15; letter-spacing: -1px; color: #fff; margin-bottom: 20px; }
.hero h1 .grad { background: linear-gradient(135deg, var(--accent), #22d3ee, var(--aux)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: 17px; color: var(--text-dim); line-height: 1.8; max-width: 520px; margin-bottom: 36px; }
.hero-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.hero-badges { display: flex; gap: 16px; margin-top: 40px; flex-wrap: wrap; }
.hero-badge { display: flex; align-items: center; gap: 10px; background: rgba(255,255,255,0.05); border: 1px solid var(--border); border-radius: 14px; padding: 10px 16px; font-size: 13px; color: var(--text-dim); }
.hero-badge i { color: var(--accent); }
.hero-card { background: rgba(17,24,39,0.85); backdrop-filter: blur(24px); border: 1px solid rgba(0,229,255,0.2); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.hero-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--accent), var(--aux)); }
.hero-card h3 { font-size: 20px; font-weight: 800; margin-bottom: 8px; color: #fff; }
.hero-card p { font-size: 14px; color: var(--text-dim); margin-bottom: 28px; }
.hero-card .stat-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; font-size: 13px; color: var(--text-dim); }
.hero-card .stat-item { display: flex; flex-direction: column; gap: 6px; padding: 14px; background: rgba(255,255,255,0.04); border-radius: 12px; border: 1px solid rgba(255,255,255,0.05); }
.hero-card .stat-item strong { font-size: 20px; font-weight: 800; color: var(--accent); }
.hero-card .stat-item span { font-size: 12px; }
.hero-card .card-btn { display: flex; align-items: center; justify-content: center; margin-top: 26px; padding: 14px; border-radius: 12px; background: linear-gradient(135deg, rgba(0,229,255,0.2), rgba(139,92,246,0.2)); border: 1px solid rgba(0,229,255,0.3); color: #fff; font-weight: 700; gap: 8px; transition: all .3s; }
.hero-card .card-btn:hover { background: linear-gradient(135deg, rgba(0,229,255,0.35), rgba(139,92,246,0.35)); box-shadow: 0 0 30px rgba(0,229,255,0.2); transform: translateY(-2px); }

/* ===== Feature Cards ===== */
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 24px; transition: all .35s ease; position: relative; overflow: hidden; }
.feature-card::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--accent), transparent); opacity: 0; transition: opacity .35s; }
.feature-card:hover { transform: translateY(-6px); border-color: rgba(0,229,255,0.3); box-shadow: var(--shadow); }
.feature-card:hover::after { opacity: 1; }
.feature-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 20px; background: linear-gradient(135deg, var(--accent-dim), rgba(139,92,246,0.15)); color: var(--accent); border: 1px solid rgba(0,229,255,0.2); }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: #fff; }
.feature-card p { font-size: 14px; color: var(--text-dim); line-height: 1.75; }

/* ===== Category / Entry ===== */
.category-section { background: var(--bg-deep); position: relative; }
.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.category-card { position: relative; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); min-height: 300px; display: flex; align-items: flex-end; transition: all .4s ease; }
.category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(0,229,255,0.3); }
.category-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; }
.category-card .overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(5,7,13,0.95) 0%, rgba(5,7,13,0.4) 50%, rgba(5,7,13,0.1) 100%); z-index: 1; }
.category-card .content { position: relative; z-index: 2; padding: 28px; width: 100%; }
.category-card .cat-tag { font-size: 12px; color: var(--accent); background: var(--accent-dim); border: 1px solid rgba(0,229,255,0.25); padding: 4px 12px; border-radius: 100px; display: inline-block; margin-bottom: 12px; }
.category-card h3 { font-size: 24px; font-weight: 800; color: #fff; margin-bottom: 6px; }
.category-card p { font-size: 14px; color: var(--text-dim); margin-bottom: 14px; max-width: 360px; }
.category-card .more { font-size: 14px; font-weight: 600; color: var(--accent); display: inline-flex; align-items: center; gap: 6px; }

/* ===== News ===== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: all .35s ease; display: flex; flex-direction: column; gap: 12px; }
.news-card:hover { transform: translateY(-5px); border-color: rgba(0,229,255,0.3); box-shadow: var(--shadow); }
.news-tag { display: inline-flex; align-self: flex-start; align-items: center; font-size: 12px; font-weight: 600; color: var(--aux); background: rgba(139,92,246,0.15); border: 1px solid rgba(139,92,246,0.25); padding: 3px 12px; border-radius: 100px; }
.news-card h3 { font-size: 18px; font-weight: 700; color: #fff; line-height: 1.5; transition: color .3s; }
.news-card:hover h3 { color: var(--accent); }
.news-card p { font-size: 14px; color: var(--text-dim); line-height: 1.7; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.news-meta { display: flex; align-items: center; gap: 12px; font-size: 12px; color: var(--text-faint); margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); }
.news-meta i { font-size: 13px; margin-right: 4px; }

/* ===== Stats ===== */
.stats-section { background: linear-gradient(135deg, rgba(0,229,255,0.08), rgba(139,92,246,0.1)), url('/assets/images/backpic/back-3.png') center center/cover no-repeat; position: relative; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.stats-section::before { content: ''; position: absolute; inset: 0; background: rgba(5,7,13,0.82); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; position: relative; z-index: 2; }
.stat-box { text-align: center; padding: 20px; }
.stat-box .num { font-size: clamp(30px, 4vw, 48px); font-weight: 900; background: linear-gradient(135deg, var(--accent), #fff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; display: block; margin-bottom: 6px; }
.stat-box .label { font-size: 14px; color: var(--text-dim); }

/* ===== Process ===== */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; counter-reset: step; }
.process-step { text-align: center; position: relative; padding: 30px 20px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); transition: all .35s ease; }
.process-step:hover { transform: translateY(-4px); border-color: rgba(0,229,255,0.3); box-shadow: var(--shadow); }
.process-step .step-num { counter-increment: step; }
.process-step .step-num::before { content: '0' counter(step); font-size: 22px; font-weight: 900; color: var(--accent); background: var(--accent-dim); border: 1px solid rgba(0,229,255,0.3); width: 52px; height: 52px; border-radius: 14px; display: inline-flex; align-items: center; justify-content: center; margin-bottom: 18px; box-shadow: 0 0 20px rgba(0,229,255,0.15); }
.process-step h3 { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.process-step p { font-size: 14px; color: var(--text-dim); line-height: 1.7; }
.process-arrow { position: absolute; top: 50%; right: -18px; transform: translateY(-50%); color: var(--accent); font-size: 16px; opacity: .6; z-index: 3; }

/* ===== FAQ ===== */
.faq-wrap { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 14px; overflow: hidden; transition: all .3s ease; }
.faq-item.active { border-color: rgba(0,229,255,0.3); box-shadow: 0 0 20px rgba(0,229,255,0.06); }
.faq-q { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; cursor: pointer; font-size: 16px; font-weight: 600; color: #fff; transition: color .3s; }
.faq-q:hover { color: var(--accent); }
.faq-q .q-icon { width: 28px; height: 28px; border-radius: 8px; background: var(--accent-dim); display: flex; align-items: center; justify-content: center; font-size: 13px; color: var(--accent); transition: all .3s; flex-shrink: 0; }
.faq-item.active .q-icon { transform: rotate(45deg); background: var(--accent); color: #0a0e17; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; padding: 0 24px; font-size: 15px; color: var(--text-dim); line-height: 1.8; }
.faq-item.active .faq-a { max-height: 300px; padding: 0 24px 20px; }

/* ===== CTA ===== */
.cta-section { position: relative; padding: 100px 0; background: url('/assets/images/backpic/back-2.png') center center/cover no-repeat; text-align: center; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: rgba(5,7,13,0.8); }
.cta-inner { position: relative; z-index: 2; max-width: 700px; margin: 0 auto; }
.cta-inner h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 900; color: #fff; margin-bottom: 16px; }
.cta-inner p { font-size: 16px; color: var(--text-dim); margin-bottom: 36px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
.site-footer { background: var(--bg-deep); border-top: 1px solid var(--border); padding: 70px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 50px; padding-bottom: 50px; }
.footer-brand .logo { margin-bottom: 18px; }
.footer-brand p { font-size: 14px; color: var(--text-dim); line-height: 1.8; max-width: 300px; }
.footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 20px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-col ul a { font-size: 14px; color: var(--text-dim); transition: all .3s; display: inline-flex; align-items: center; gap: 8px; }
.footer-col ul a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom { border-top: 1px solid var(--border); padding: 24px 0; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 13px; color: var(--text-faint); }
.footer-bottom .legal { display: flex; gap: 20px; }
.footer-bottom a { font-size: 13px; color: var(--text-faint); }
.footer-bottom a:hover { color: var(--accent); }

/* ===== Page Banner ===== */
.page-banner { position: relative; padding: 170px 0 80px; background: linear-gradient(135deg, rgba(5,7,13,0.9), rgba(0,229,255,0.1)), url('/assets/images/backpic/back-2.png') center center/cover no-repeat; border-bottom: 1px solid var(--border); }
.page-banner::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 80px; background: linear-gradient(to top, var(--bg-primary), transparent); }
.page-banner .container { position: relative; z-index: 2; }
.page-banner h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 900; color: #fff; margin-bottom: 12px; }
.page-banner p { font-size: 16px; color: var(--text-dim); max-width: 600px; }
.breadcrumb { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-faint); margin-top: 16px; }
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb i { font-size: 11px; }

/* ===== Article ===== */
.article-layout { display: grid; grid-template-columns: 1.8fr 1fr; gap: 40px; align-items: start; }
.article-main { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow-sm); }
.article-main .article-title { font-size: clamp(24px, 3vw, 32px); font-weight: 800; color: #fff; line-height: 1.4; margin-bottom: 20px; }
.article-main .article-meta { display: flex; align-items: center; gap: 16px; font-size: 14px; color: var(--text-dim); padding-bottom: 24px; border-bottom: 1px solid var(--border); margin-bottom: 28px; flex-wrap: wrap; }
.article-main .article-meta .badge { background: var(--accent-dim); color: var(--accent); border: 1px solid rgba(0,229,255,0.25); padding: 3px 12px; border-radius: 100px; font-size: 13px; font-weight: 600; }
.article-content { font-size: 16px; line-height: 2; color: #cbd5e1; }
.article-content h2 { font-size: 24px; color: #fff; margin: 32px 0 16px; font-weight: 800; }
.article-content h3 { font-size: 20px; color: #fff; margin: 28px 0 14px; font-weight: 700; }
.article-content p { margin-bottom: 18px; }
.article-content ul, .article-content ol { margin: 0 0 18px 20px; }
.article-content li { margin-bottom: 8px; }
.article-content img { border-radius: 12px; margin: 20px 0; }
.article-sidebar { display: flex; flex-direction: column; gap: 24px; position: sticky; top: 100px; }
.sidebar-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.sidebar-card h3 { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 18px; display: flex; align-items: center; gap: 8px; }
.sidebar-card h3 i { color: var(--accent); }
.sidebar-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.sidebar-list a { font-size: 14px; color: var(--text-dim); display: flex; align-items: center; gap: 8px; transition: all .3s; padding: 8px 12px; border-radius: 8px; }
.sidebar-list a:hover { color: var(--accent); background: var(--accent-dim); padding-left: 16px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .container { padding: 0 20px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-card { max-width: 500px; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
}
@media (max-width: 768px) {
  :root { --space-section: 60px; }
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .nav-actions .btn { display: none; }
  .category-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .process-arrow { display: none; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stats-section::before { background: rgba(5,7,13,0.88); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero { min-height: auto; padding: 120px 0 70px; }
  .hero-actions .btn { width: 100%; }
  .article-main { padding: 24px; }
  .faq-q { font-size: 15px; padding: 16px 18px; }
  .faq-a { padding: 0 18px; }
  .faq-item.active .faq-a { padding: 0 18px 16px; }
}
@media (max-width: 520px) {
  .container { padding: 0 14px; }
  .logo { font-size: 18px; }
  .logo .logo-badge { width: 30px; height: 30px; font-size: 14px; border-radius: 7px; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-bottom .legal { flex-wrap: wrap; justify-content: center; }
  .news-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 24px 20px; }
}

/* roulang page: category1 */
:root {
    --bg-primary: #0b0f1a;
    --bg-secondary: #111827;
    --bg-card: #131c2b;
    --accent: #00e0ff;
    --accent2: #7c5cff;
    --text-main: #e5e7eb;
    --text-dim: #94a3b8;
    --border: rgba(255,255,255,0.08);
    --radius: 18px;
    --shadow: 0 12px 40px rgba(0,0,0,0.45);
    --header-h: 72px;
  }

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

  html { scroll-behavior: smooth; }

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

  img { max-width: 100%; display: block; }
  a { text-decoration: none; color: inherit; transition: color .2s; }
  ul, ol { list-style: none; }
  button { font-family: inherit; cursor: pointer; }

  ::selection { background: rgba(0,224,255,.3); }

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

  /* ===== Header / Nav ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11,15,26,.82);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    height: var(--header-h);
  }

  .nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    gap: 24px;
  }

  .logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    white-space: nowrap;
  }

  .logo-badge {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(0,224,255,.2), rgba(124,92,255,.2));
    border: 1px solid rgba(0,224,255,.3);
    color: var(--accent);
    font-size: 15px;
    box-shadow: 0 0 18px rgba(0,224,255,.15);
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dim);
    border: 1px solid transparent;
    transition: all .25s ease;
  }

  .nav-link i { font-size: 13px; }

  .nav-link:hover {
    color: #fff;
    background: rgba(255,255,255,.06);
    border-color: var(--border);
  }

  .nav-link.active {
    color: #fff;
    background: rgba(0,224,255,.12);
    border-color: rgba(0,224,255,.35);
    box-shadow: 0 0 20px rgba(0,224,255,.15), inset 0 0 10px rgba(0,224,255,.06);
    text-shadow: 0 0 8px rgba(0,224,255,.35);
  }

  .nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    padding: 12px 26px;
    border: 1px solid transparent;
    transition: all .28s ease;
    cursor: pointer;
    white-space: nowrap;
  }

  .btn-primary {
    background: linear-gradient(135deg, #00e0ff, #7c5cff);
    color: #fff;
    box-shadow: 0 8px 24px rgba(0,224,255,.25);
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 36px rgba(0,224,255,.4);
    filter: brightness(1.1);
  }

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

  .btn-ghost {
    background: transparent;
    color: var(--text-main);
    border-color: var(--border);
  }

  .btn-ghost:hover {
    border-color: rgba(0,224,255,.5);
    color: #fff;
    background: rgba(0,224,255,.06);
  }

  .btn-sm { padding: 8px 18px; font-size: 13px; border-radius: 10px; }

  .nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-main);
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    font-size: 16px;
  }

  /* ===== Hero / Banner ===== */
  .category-hero {
    position: relative;
    padding: 100px 0 90px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
  }

  .category-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(11,15,26,.88) 0%, rgba(11,15,26,.72) 50%, rgba(11,15,26,.95) 100%);
  }

  .category-hero .container { position: relative; z-index: 2; text-align: center; max-width: 860px; }

  .category-hero .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0,224,255,.12);
    border: 1px solid rgba(0,224,255,.35);
    color: var(--accent);
    padding: 6px 18px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: .5px;
    margin-bottom: 24px;
  }

  .category-hero h1 {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 800;
    line-height: 1.2;
    color: #fff;
    margin-bottom: 18px;
    text-shadow: 0 2px 30px rgba(0,224,255,.2);
  }

  .category-hero h1 span {
    background: linear-gradient(90deg, #00e0ff, #7c5cff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .category-hero p {
    font-size: 17px;
    color: var(--text-dim);
    line-height: 1.8;
    margin-bottom: 36px;
  }

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

  /* ===== Section ===== */
  .section-block { padding: 80px 0; }
  .section-block.alt { background: var(--bg-secondary); }

  .section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 50px;
  }

  .section-head .tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    background: rgba(0,224,255,.1);
    border: 1px solid rgba(0,224,255,.25);
    margin-bottom: 14px;
    letter-spacing: 1px;
  }

  .section-head h2 {
    font-size: clamp(26px, 3.5vw, 38px);
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 12px;
  }

  .section-head p {
    color: var(--text-dim);
    font-size: 16px;
  }

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

  .feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 26px;
    position: relative;
    overflow: hidden;
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  }

  .feature-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, rgba(0,224,255,.5), transparent);
    opacity: 0;
    transition: opacity .3s;
  }

  .feature-card:hover {
    transform: translateY(-6px);
    border-color: rgba(0,224,255,.3);
    box-shadow: 0 16px 44px rgba(0,0,0,.5), 0 0 24px rgba(0,224,255,.08);
  }

  .feature-card:hover::after { opacity: 1; }

  .feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: rgba(0,224,255,.1);
    border: 1px solid rgba(0,224,255,.25);
    color: var(--accent);
    font-size: 22px;
    margin-bottom: 20px;
  }

  .feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
  }

  .feature-card p {
    font-size: 14px;
    color: var(--text-dim);
    line-height: 1.7;
  }

  /* ===== Info split ===== */
  .info-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
  }

  .info-media {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .info-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 320px;
    transition: transform .5s ease;
  }

  .info-media:hover img { transform: scale(1.02); }

  .info-media::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(11,15,26,.6));
    z-index: 1;
  }

  .info-media .play-tag {
    position: absolute;
    bottom: 20px;
    left: 20px;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    background: rgba(0,0,0,.5);
    padding: 6px 14px;
    border-radius: 999px;
    backdrop-filter: blur(8px);
  }

  .info-content h2 {
    font-size: 30px;
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 16px;
  }

  .info-content h2 span { color: var(--accent); }

  .info-content p {
    color: var(--text-dim);
    font-size: 15px;
    line-height: 1.9;
    margin-bottom: 16px;
  }

  .info-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 24px 0;
  }

  .info-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: var(--text-main);
    font-size: 14px;
    line-height: 1.6;
  }

  .info-list i {
    color: var(--accent);
    font-size: 14px;
    margin-top: 4px;
  }

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

  .step-item {
    background: rgba(255,255,255,.02);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 26px;
    position: relative;
    transition: all .3s;
  }

  .step-item:hover {
    border-color: rgba(0,224,255,.3);
    background: rgba(0,224,255,.03);
    transform: translateY(-4px);
  }

  .step-number {
    font-size: 42px;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, rgba(0,224,255,.25), rgba(124,92,255,.25));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 14px;
  }

  .step-item h3 {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
  }

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

  /* ===== Stats ===== */
  .stats-band {
    background: linear-gradient(135deg, #101c2e 0%, #131c2b 100%);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 48px 40px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    position: relative;
    overflow: hidden;
  }

  .stats-band::before {
    content: '';
    position: absolute;
    top: -60px;
    right: -60px;
    width: 180px;
    height: 180px;
    background: radial-gradient(circle, rgba(0,224,255,.15), transparent 70%);
    pointer-events: none;
  }

  .stat-item { text-align: center; }

  .stat-item .num {
    font-size: 38px;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    background: linear-gradient(90deg, #00e0ff, #7c5cff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .stat-item .label {
    font-size: 14px;
    color: var(--text-dim);
    margin-top: 6px;
  }

  /* ===== FAQ ===== */
  .faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: grid;
    gap: 16px;
  }

  .faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 0;
    overflow: hidden;
    transition: border-color .3s;
  }

  .faq-item:hover { border-color: rgba(0,224,255,.25); }

  .faq-q {
    width: 100%;
    background: transparent;
    border: none;
    padding: 22px 26px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    transition: color .2s;
  }

  .faq-q:hover { color: var(--accent); }

  .faq-q i {
    color: var(--accent);
    font-size: 14px;
    transition: transform .3s;
    flex-shrink: 0;
  }

  .faq-item.open .faq-q i { transform: rotate(45deg); }

  .faq-a {
    padding: 0 26px 22px;
    color: var(--text-dim);
    font-size: 14px;
    line-height: 1.8;
    display: none;
  }

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

  /* ===== CTA ===== */
  .cta-band {
    background: linear-gradient(135deg, rgba(0,224,255,.08), rgba(124,92,255,.08));
    border: 1px solid rgba(0,224,255,.3);
    border-radius: 24px;
    padding: 56px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .cta-band::before {
    content: '';
    position: absolute;
    bottom: -80px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 220px;
    background: radial-gradient(ellipse, rgba(0,224,255,.15), transparent 70%);
    pointer-events: none;
  }

  .cta-band h2 {
    font-size: 30px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
  }

  .cta-band p {
    color: var(--text-dim);
    font-size: 16px;
    margin-bottom: 28px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

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

  /* ===== Footer ===== */
  .site-footer {
    background: #0a0e17;
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
    margin-top: 80px;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 40px;
    margin-bottom: 44px;
  }

  .footer-brand .logo { margin-bottom: 14px; }

  .footer-brand p {
    font-size: 14px;
    color: var(--text-dim);
    line-height: 1.8;
    max-width: 320px;
  }

  .footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
  }

  .footer-col ul li { margin-bottom: 10px; font-size: 14px; }

  .footer-col ul a {
    color: var(--text-dim);
    transition: color .2s, padding-left .2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }

  .footer-col ul a:hover {
    color: var(--accent);
    padding-left: 4px;
  }

  .footer-col ul a i { font-size: 12px; color: var(--accent); }

  .footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 26px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
  }

  .footer-bottom p {
    font-size: 13px;
    color: var(--text-dim);
  }

  .footer-bottom .legal {
    display: flex;
    gap: 18px;
  }

  .footer-bottom .legal a {
    font-size: 13px;
    color: var(--text-dim);
  }

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

  /* ===== Responsive ===== */
  @media (max-width: 1024px) {
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-band { grid-template-columns: repeat(2, 1fr); }
    .info-split { gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
  }

  @media (max-width: 768px) {
    .nav-wrap { gap: 12px; }

    .main-nav {
      position: fixed;
      top: var(--header-h);
      left: 0;
      right: 0;
      background: rgba(11,15,26,.97);
      flex-direction: column;
      align-items: stretch;
      padding: 16px 24px 20px;
      gap: 8px;
      border-bottom: 1px solid var(--border);
      backdrop-filter: blur(20px);
      transform: translateY(-100%);
      opacity: 0;
      visibility: hidden;
      transition: all .35s ease;
    }

    .main-nav.open {
      transform: translateY(0);
      opacity: 1;
      visibility: visible;
    }

    .nav-link { justify-content: center; padding: 12px; }

    .nav-toggle { display: inline-flex; }

    .category-hero { padding: 70px 0 60px; }
    .section-block { padding: 60px 0; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn { width: 100%; max-width: 300px; }

    .card-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .stats-band { grid-template-columns: 1fr; padding: 36px 24px; }
    .info-split { grid-template-columns: 1fr; gap: 32px; }
    .info-media img { min-height: 220px; }

    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .footer-bottom .legal { justify-content: center; }
  }

  @media (max-width: 520px) {
    .container { padding: 0 16px; }
    .logo { font-size: 17px; }
    .logo-badge { width: 30px; height: 30px; font-size: 13px; }
    .category-hero h1 { font-size: 28px; }
    .info-list { grid-template-columns: 1fr; }
    .cta-band { padding: 36px 20px; }
    .cta-actions .btn { width: 100%; }
  }

  /* focus-visible */
  a:focus-visible, button:focus-visible, .btn:focus-visible {
    outline: 2px solid rgba(0,224,255,.7);
    outline-offset: 3px;
    border-radius: 8px;
  }

/* roulang page: article */
:root {
        --bg: #05070f;
        --bg-alt: #0b1120;
        --bg-card: rgba(15, 23, 42, 0.75);
        --accent: #00e5ff;
        --accent-2: #a855f7;
        --accent-dim: rgba(0, 229, 255, 0.15);
        --text: #e2e8f0;
        --text-dim: #94a3b8;
        --border: rgba(0, 229, 255, 0.18);
        --radius: 16px;
        --radius-sm: 10px;
        --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
        --glow: 0 0 24px rgba(0, 229, 255, 0.25);
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
        scroll-behavior: smooth;
    }

    body {
        background: var(--bg);
        color: var(--text);
        font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
        line-height: 1.7;
        font-size: 16px;
        -webkit-font-smoothing: antialiased;
        overflow-x: hidden;
    }

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

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

    button {
        font-family: inherit;
    }

    .container {
        width: 100%;
        margin-inline: auto;
        padding-inline: 1rem;
    }

    @media (min-width: 640px) {
        .container {
            max-width: 640px;
        }
    }
    @media (min-width: 768px) {
        .container {
            max-width: 768px;
        }
    }
    @media (min-width: 1024px) {
        .container {
            max-width: 1024px;
        }
    }
    @media (min-width: 1280px) {
        .container {
            max-width: 1200px;
        }
    }

    /* ===== Header / Nav ===== */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
        background: rgba(5, 7, 15, 0.85);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border-bottom: 1px solid rgba(0, 229, 255, 0.12);
        box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    }

    .nav-wrap {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 70px;
        gap: 1rem;
    }

    .logo {
        display: flex;
        align-items: center;
        gap: 0.65rem;
        font-size: 1.15rem;
        font-weight: 700;
        color: #fff;
        white-space: nowrap;
        line-height: 1.4;
    }

    .logo-badge {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 42px;
        background: linear-gradient(135deg, var(--accent), var(--accent-2));
        border-radius: 12px;
        color: #05070f;
        font-size: 1.25rem;
        flex-shrink: 0;
        box-shadow: 0 0 18px rgba(0, 229, 255, 0.35);
    }

    .main-nav {
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .nav-link {
        display: inline-flex;
        align-items: center;
        gap: 0.45rem;
        padding: 0.6rem 1.2rem;
        border-radius: 999px;
        font-size: 0.95rem;
        font-weight: 500;
        color: var(--text-dim);
        border: 1px solid transparent;
        transition: var(--transition);
    }

    .nav-link i {
        font-size: 0.9rem;
    }

    .nav-link:hover {
        color: #fff;
        background: rgba(0, 229, 255, 0.08);
        border-color: rgba(0, 229, 255, 0.25);
        box-shadow: 0 0 16px rgba(0, 229, 255, 0.12);
    }

    .nav-link.active {
        color: #fff;
        background: var(--accent-dim);
        border-color: rgba(0, 229, 255, 0.3);
        box-shadow: 0 0 20px rgba(0, 229, 255, 0.18);
    }

    .nav-actions {
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

    .nav-toggle {
        display: none;
        background: none;
        border: 1px solid var(--border);
        color: #fff;
        width: 42px;
        height: 42px;
        border-radius: 10px;
        font-size: 1.1rem;
        cursor: pointer;
        transition: var(--transition);
        align-items: center;
        justify-content: center;
    }

    .nav-toggle:hover {
        background: var(--accent-dim);
        box-shadow: var(--glow);
    }

    /* ===== Buttons ===== */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        padding: 0.7rem 1.6rem;
        border-radius: 999px;
        font-size: 0.95rem;
        font-weight: 600;
        line-height: 1.5;
        border: 1px solid transparent;
        cursor: pointer;
        transition: var(--transition);
        text-decoration: none;
    }

    .btn-primary {
        background: linear-gradient(135deg, #00e5ff, #00b4d8);
        color: #05070f;
        box-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
    }

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 30px rgba(0, 229, 255, 0.35);
    }

    .btn-outline {
        border-color: rgba(0, 229, 255, 0.4);
        color: #fff;
        background: rgba(0, 229, 255, 0.06);
    }

    .btn-outline:hover {
        background: var(--accent-dim);
        border-color: var(--accent);
        box-shadow: var(--glow);
        transform: translateY(-2px);
    }

    .btn-sm {
        padding: 0.45rem 1.1rem;
        font-size: 0.85rem;
    }

    .btn-lg {
        padding: 0.95rem 2.2rem;
        font-size: 1.05rem;
    }

    /* ===== Hero ===== */
    .article-hero {
        position: relative;
        background-size: cover;
        background-position: center;
        min-height: 420px;
        display: flex;
        align-items: center;
    }

    .article-hero::before {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(5, 7, 15, 0.93), rgba(15, 23, 42, 0.78));
    }

    .badge-danger,
    .badge-outline {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
        padding: 0.35rem 1rem;
        border-radius: 999px;
        font-size: 0.8rem;
        font-weight: 600;
    }

    .badge-danger {
        background: linear-gradient(135deg, var(--accent), var(--accent-2));
        color: #05070f;
        box-shadow: 0 0 14px rgba(0, 229, 255, 0.3);
    }

    .badge-outline {
        border: 1px solid rgba(255, 255, 255, 0.25);
        color: rgba(255, 255, 255, 0.85);
    }

    /* ===== Article ===== */
    .article-card {
        background: var(--bg-card);
        border: 1px solid var(--border);
        box-shadow: var(--shadow);
        backdrop-filter: blur(10px);
        border-radius: var(--radius);
    }

    .article-content {
        font-size: 1.05rem;
        line-height: 1.9;
        color: #cbd5e1;
    }

    .article-content h2,
    .article-content h3 {
        color: #fff;
        margin-top: 2rem;
        margin-bottom: 1rem;
        line-height: 1.5;
    }

    .article-content h2 {
        font-size: 1.5rem;
        border-left: 4px solid var(--accent);
        padding-left: 0.9rem;
    }

    .article-content h3 {
        font-size: 1.25rem;
    }

    .article-content p {
        margin-bottom: 1.25rem;
    }

    .article-content ul,
    .article-content ol {
        margin-bottom: 1.25rem;
        padding-left: 1.5rem;
    }

    .article-content ul {
        list-style: disc;
    }

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

    .article-content li {
        margin-bottom: 0.5rem;
    }

    .article-content a {
        color: var(--accent);
        border-bottom: 1px dashed rgba(0, 229, 255, 0.4);
    }

    .article-content blockquote {
        border-left: 3px solid var(--accent);
        background: rgba(0, 229, 255, 0.05);
        padding: 1rem 1.25rem;
        margin: 1.5rem 0;
        border-radius: 0 10px 10px 0;
    }

    .article-content img {
        border-radius: 12px;
        margin: 1.5rem 0;
    }

    .article-content table {
        width: 100%;
        border-collapse: collapse;
        margin: 1.5rem 0;
    }

    .article-content th,
    .article-content td {
        border: 1px solid rgba(255, 255, 255, 0.12);
        padding: 0.6rem 0.9rem;
    }

    .article-content th {
        background: rgba(0, 229, 255, 0.08);
        color: #fff;
    }

    /* ===== Tags / Share ===== */
    .tag-chip {
        display: inline-flex;
        align-items: center;
        padding: 0.3rem 0.9rem;
        border-radius: 999px;
        background: rgba(0, 229, 255, 0.08);
        border: 1px solid rgba(0, 229, 255, 0.2);
        color: var(--text);
        font-size: 0.82rem;
        transition: var(--transition);
    }

    .tag-chip:hover {
        background: var(--accent-dim);
        color: #fff;
        box-shadow: var(--glow);
    }

    .share-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 38px;
        height: 38px;
        border-radius: 50%;
        border: 1px solid var(--border);
        color: var(--text-dim);
        background: rgba(255, 255, 255, 0.03);
        transition: var(--transition);
    }

    .share-btn:hover {
        transform: translateY(-3px);
    }

    .share-btn.wechat:hover {
        background: #07c160;
        border-color: #07c160;
        color: #fff;
    }

    .share-btn.weibo:hover {
        background: #e6162d;
        border-color: #e6162d;
        color: #fff;
    }

    .share-btn.qq:hover {
        background: #12b7f5;
        border-color: #12b7f5;
        color: #fff;
    }

    .article-footer-divider {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    /* ===== News cards ===== */
    .news-card {
        display: block;
        background: var(--bg-card);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: var(--radius);
        padding: 1.6rem;
        transition: var(--transition);
        text-decoration: none;
        height: 100%;
    }

    .news-card:hover {
        transform: translateY(-6px);
        border-color: rgba(0, 229, 255, 0.35);
        box-shadow: 0 14px 40px rgba(0, 0, 0, 0.4), var(--glow);
    }

    .news-card h3 {
        transition: var(--transition);
    }

    .news-card:hover h3 {
        color: var(--accent);
    }

    .line-clamp-2 {
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    /* ===== Feature cards ===== */
    .feature-card {
        background: var(--bg-card);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        transition: var(--transition);
        height: 100%;
    }

    .feature-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
        border-color: rgba(0, 229, 255, 0.25);
    }

    .stat-card {
        background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(168, 85, 247, 0.05));
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 2rem 1.5rem;
        text-align: center;
        transition: var(--transition);
    }

    .stat-card:hover {
        box-shadow: var(--glow);
        transform: translateY(-3px);
    }

    .stat-value {
        font-size: 2.2rem;
        font-weight: 800;
        color: var(--accent);
        text-shadow: 0 0 20px rgba(0, 229, 255, 0.35);
        line-height: 1.3;
    }

    .stat-label {
        color: var(--text-dim);
        font-size: 0.95rem;
        margin-top: 0.3rem;
    }

    /* ===== FAQ ===== */
    .faq-item {
        background: var(--bg-card);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: var(--radius-sm);
        overflow: hidden;
        transition: var(--transition);
    }

    .faq-item:hover {
        border-color: rgba(0, 229, 255, 0.2);
    }

    .faq-question {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
        padding: 1.2rem 1.5rem;
        cursor: pointer;
        color: #fff;
        font-size: 1.05rem;
        font-weight: 600;
        user-select: none;
        margin: 0;
        transition: var(--transition);
    }

    .faq-question i {
        color: var(--accent);
        transition: transform 0.3s ease;
        flex-shrink: 0;
    }

    .faq-item.open {
        border-color: rgba(0, 229, 255, 0.35);
        box-shadow: var(--glow);
    }

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

    .faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 1.5rem;
        color: var(--text-dim);
        line-height: 1.8;
        transition: max-height 0.4s ease, padding 0.4s ease;
    }

    .faq-item.open .faq-answer {
        max-height: 320px;
        padding: 0 1.5rem 1.4rem;
    }

    /* ===== CTA ===== */
    .cta-section {
        background-size: cover;
        background-position: center;
        position: relative;
    }

    .cta-section::before {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(5, 7, 15, 0.92), rgba(15, 23, 42, 0.82));
    }

    /* ===== Footer ===== */
    .site-footer {
        background: #05070f;
        border-top: 1px solid rgba(0, 229, 255, 0.1);
        padding: 4rem 0 2rem;
        margin-top: 0;
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
        gap: 2.5rem;
        margin-bottom: 3rem;
    }

    .footer-brand p {
        color: var(--text-dim);
        font-size: 0.92rem;
        margin-top: 1rem;
        max-width: 320px;
        line-height: 1.8;
    }

    .footer-col h4 {
        color: #fff;
        font-size: 1rem;
        font-weight: 600;
        margin-bottom: 1rem;
    }

    .footer-col ul {
        list-style: none;
    }

    .footer-col li {
        margin-bottom: 0.6rem;
    }

    .footer-col a {
        color: var(--text-dim);
        font-size: 0.92rem;
        transition: var(--transition);
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
    }

    .footer-col a:hover {
        color: var(--accent);
        padding-left: 0.25rem;
    }

    .footer-col i {
        font-size: 0.8rem;
        color: var(--accent);
    }

    .footer-bottom {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
        padding-top: 2rem;
        border-top: 1px solid rgba(255, 255, 255, 0.06);
        color: var(--text-dim);
        font-size: 0.88rem;
        flex-wrap: wrap;
    }

    .legal {
        display: flex;
        gap: 1.2rem;
        flex-wrap: wrap;
    }

    .legal a {
        color: var(--text-dim);
        transition: var(--transition);
    }

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

    /* ===== Eyebrow ===== */
    .eyebrow {
        font-size: 0.8rem;
        letter-spacing: 0.22em;
        text-transform: uppercase;
        font-weight: 700;
    }

    /* ===== Not found ===== */
    .not-found i {
        text-shadow: 0 0 30px rgba(0, 229, 255, 0.4);
    }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
        .footer-grid {
            grid-template-columns: 1fr 1fr;
        }
    }

    @media (max-width: 768px) {
        .nav-wrap {
            height: 64px;
        }

        .main-nav {
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            flex-direction: column;
            align-items: stretch;
            background: rgba(5, 7, 15, 0.97);
            border-bottom: 1px solid var(--border);
            padding: 1rem 1.5rem 1.5rem;
            gap: 0.75rem;
            transform: translateY(-120%);
            opacity: 0;
            transition: var(--transition);
            z-index: 99;
            box-shadow: 0 30px 50px rgba(0, 0, 0, 0.3);
        }

        .main-nav.open {
            transform: translateY(0);
            opacity: 1;
        }

        .nav-link {
            justify-content: flex-start;
            padding: 0.8rem 1.2rem;
            border-radius: 10px;
        }

        .nav-toggle {
            display: inline-flex;
        }

        .nav-actions {
            gap: 0.5rem;
        }

        .nav-actions .btn {
            display: none;
        }

        .article-hero {
            min-height: 360px;
        }

        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
    }

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

        .main-nav {
            top: 60px;
        }

        .logo {
            font-size: 1rem;
        }

        .logo-badge {
            width: 36px;
            height: 36px;
            font-size: 1.05rem;
        }

        .footer-grid {
            grid-template-columns: 1fr;
            gap: 1.8rem;
        }

        .article-card {
            padding: 1.5rem !important;
        }

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

        .article-hero h1 {
            font-size: 1.75rem;
        }

        .btn-lg {
            padding: 0.8rem 1.6rem;
        }
    }