:root {
  --bg: #f7f5ef;
  --card: #ffffff;
  --text: #20242c;
  --muted: #6b7280;
  --line: #e7e1d6;
  --brand: #d66f38;
  --brand-dark: #8a3f1f;
  --soft: #fff4e8;
  --green: #2f8f79;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #fff7ed, var(--bg) 32%, #f4f7fb 100%);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--brand-dark); }
img { max-width: 100%; display: block; }
.site-header, .site-footer, main { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-header { padding: 18px 0 10px; }
.topbar, .main-nav, .search-wrap, .hero, .card, .module-card, .author-card, .comment-card, .faq-card, .page-hero, .content-panel {
  background: rgba(255,255,255,.86);
  border: 1px solid var(--line);
  box-shadow: 0 18px 48px rgba(70, 55, 38, .08);
  backdrop-filter: blur(12px);
}
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding: 14px 18px; border-radius: 28px; }
.brand-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.logo-mark { width: 48px; height: 48px; border-radius: 16px; display: grid; place-items: center; color: #fff; background: linear-gradient(135deg, var(--brand), #f2a55f); font-size: 22px; box-shadow: 0 10px 22px rgba(214,111,56,.28); }
.logo-text { font-size: 20px; letter-spacing: .02em; }
.domain-pill { margin: 0; padding: 8px 12px; border-radius: 999px; background: var(--soft); color: var(--brand-dark); font-size: 14px; }
.main-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; padding: 10px; border-radius: 22px; }
.main-nav a { padding: 9px 14px; border-radius: 999px; color: #3d4656; font-weight: 650; }
.main-nav a:hover { background: var(--soft); color: var(--brand-dark); }
.search-wrap { margin-top: 12px; padding: 13px; border-radius: 22px; }
.search-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.search-form input { min-width: 0; border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; font-size: 16px; background: #fff; }
.search-form button, .btn, .mini-btn { border: 0; border-radius: 15px; padding: 12px 16px; background: var(--brand); color: #fff; font-weight: 700; cursor: pointer; }
.search-hint { margin: 8px 4px 0; color: var(--muted); font-size: 14px; }
.hero { display: grid; grid-template-columns: 1.05fr .95fr; gap: 24px; align-items: center; padding: 28px; border-radius: 34px; margin: 22px 0; }
.hero h1, .page-hero h1 { font-size: clamp(30px, 5vw, 56px); line-height: 1.08; margin: 0 0 16px; }
.hero p, .page-hero p { color: #4b5563; margin: 0 0 16px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.btn.secondary { background: #243042; }
.meta-list, .stats-row, .interaction-row { display: flex; flex-wrap: wrap; gap: 10px; }
.meta-list span, .stats-row span, .tag { padding: 6px 10px; border-radius: 999px; background: #f1f5f9; color: #455064; font-size: 13px; }
.hero-media figure { margin: 0; }
.video-card { position: relative; overflow: hidden; border-radius: 28px; border: 1px solid var(--line); background: #111827; min-height: 220px; }
.video-card img, .video-card video { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16/9; opacity: .96; }
.play-badge { position: absolute; inset: 0; display: grid; place-items: center; color: #fff; font-size: 54px; opacity: 0; transform: scale(.92); transition: .2s ease; background: rgba(0,0,0,.25); }
.video-card:hover .play-badge, .video-card.is-hover .play-badge { opacity: 1; transform: scale(1); }
figcaption { color: var(--muted); font-size: 13px; margin-top: 8px; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; margin: 34px 0 16px; }
.section-head h2 { margin: 0; font-size: clamp(24px, 3vw, 34px); }
.section-head p { margin: 4px 0 0; color: var(--muted); }
.grid { display: grid; gap: 16px; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.module-card, .card, .author-card, .comment-card, .faq-card, .content-panel { border-radius: 26px; padding: 18px; }
.module-card h3, .card h3, .author-card h3 { margin: 0 0 8px; }
.module-card p, .card p, .author-card p, .comment-card p { color: #4b5563; }
.module-card ul, .content-panel ul { padding-left: 19px; margin: 12px 0; }
.card-media { margin: -18px -18px 14px; }
.card-media .video-card { border-radius: 26px 26px 12px 12px; border-left: 0; border-right: 0; border-top: 0; }
.badge-line { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.interaction-row { border-top: 1px solid var(--line); padding-top: 12px; margin-top: 12px; }
.mini-btn { padding: 8px 11px; background: #fff2e7; color: var(--brand-dark); border: 1px solid #f0cfb6; }
.author-card { display: flex; flex-direction: column; min-height: 100%; }
.author-avatar { width: 62px; height: 62px; border-radius: 22px; display: grid; place-items: center; background: var(--soft); color: var(--brand-dark); font-weight: 900; margin-bottom: 10px; }
.faq-card details { border-bottom: 1px solid var(--line); padding: 12px 0; }
.faq-card details:last-child { border-bottom: 0; }
.faq-card summary { cursor: pointer; font-weight: 800; }
.site-footer { margin-top: 40px; padding: 28px 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 18px; padding: 24px; border-radius: 30px; background: #1f2937; color: #f8fafc; }
.footer-grid p, .footer-grid li { color: #dbe3ef; }
.footer-grid ul { padding-left: 18px; }
.footer-logo .logo-mark { box-shadow: none; }
.copyright { text-align: center; color: var(--muted); }
.page-hero { padding: 28px; border-radius: 34px; margin: 22px 0; }
.breadcrumb { color: var(--muted); margin-bottom: 10px; }
.breadcrumb a { color: var(--brand-dark); }
.timeline { display: grid; gap: 14px; }
.timeline article { border-left: 4px solid var(--brand); padding-left: 16px; }
.notice { background: #eefbf7; color: #17634f; border: 1px solid #bfe9db; border-radius: 18px; padding: 14px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
@media (max-width: 880px) {
  .hero, .grid.three, .grid.two, .footer-grid { grid-template-columns: 1fr; }
  .topbar { align-items: flex-start; flex-direction: column; }
  .search-form { grid-template-columns: 1fr; }
  .section-head { align-items: flex-start; flex-direction: column; }
}