:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --ink: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --brand: #111827;
  --accent: #f59e0b;
  --soft: #fff7ed;
  --radius: 20px;
  --shadow: 0 18px 50px rgba(15, 23, 42, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif; background: var(--bg); color: var(--ink); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
a:hover { color: #b45309; }
img { max-width: 100%; display: block; }
.sr-only { position: absolute; left: -9999px; }
.site-header { background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; backdrop-filter: blur(12px); }
.topbar { max-width: 1180px; margin: 0 auto; padding: 18px 20px 12px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-size: 26px; font-weight: 900; letter-spacing: .5px; }
.logo img { width: 44px; height: 44px; border-radius: 12px; }
.domain-pill { padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: #fff; font-size: 14px; }
.main-nav { max-width: 1180px; margin: 0 auto; padding: 0 20px 12px; display: flex; gap: 10px; flex-wrap: wrap; }
.main-nav a { padding: 8px 13px; border-radius: 999px; color: var(--muted); font-weight: 700; }
.main-nav a.active, .main-nav a:hover { background: var(--brand); color: #fff; }
.search-wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px 16px; display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.search-wrap input { border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; font-size: 15px; background: #fff; }
.search-wrap button, .btn { border: 0; border-radius: 14px; padding: 12px 18px; background: var(--accent); color: #111827; font-weight: 800; cursor: pointer; }
.search-tip { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 14px; }
main { max-width: 1180px; margin: 0 auto; padding: 28px 20px 56px; }
.hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: 22px; align-items: stretch; }
.hero-panel, .panel, .card, .article-body { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-panel { padding: 34px; min-height: 420px; display: flex; flex-direction: column; justify-content: center; background: linear-gradient(135deg, #fff, #fff7ed); }
.eyebrow { color: #b45309; font-weight: 900; margin: 0 0 10px; letter-spacing: .04em; }
h1 { font-size: clamp(34px, 6vw, 62px); line-height: 1.08; margin: 0 0 16px; letter-spacing: -1.6px; }
h2 { font-size: clamp(25px, 4vw, 36px); line-height: 1.2; margin: 0 0 18px; }
h3 { font-size: 20px; line-height: 1.35; margin: 0 0 10px; }
p { margin-top: 0; }
.lead { color: var(--muted); font-size: 18px; max-width: 720px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 14px; }
.btn.secondary { background: #111827; color: #fff; }
.hero-aside { display: grid; gap: 16px; }
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.stat { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.stat strong { display: block; font-size: 28px; }
.section { margin-top: 34px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.section-head p { color: var(--muted); margin-bottom: 0; max-width: 660px; }
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card { padding: 22px; }
.card img { border-radius: 16px; aspect-ratio: 16 / 9; object-fit: cover; margin-bottom: 16px; }
.meta { display: flex; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 14px; margin-bottom: 12px; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.tags span, .tag { display: inline-flex; padding: 5px 10px; border-radius: 999px; background: var(--soft); color: #9a3412; font-weight: 700; font-size: 13px; }
.video-card { overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.video-thumb { position: relative; background: #111827; }
.video-thumb video, .video-thumb img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; opacity: .95; }
.play-badge { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(.86); opacity: 0; transition: .2s ease; padding: 10px 16px; border-radius: 999px; background: rgba(17, 24, 39, .88); color: #fff; font-weight: 900; }
.video-card:hover .play-badge { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-body { padding: 20px; }
.metrics { display: flex; gap: 10px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.metrics span { background: #f3f4f6; border-radius: 999px; padding: 5px 10px; }
.topic-band { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.author-card { display: flex; gap: 16px; align-items: flex-start; }
.avatar { width: 58px; height: 58px; border-radius: 18px; background: var(--soft); display: grid; place-items: center; font-weight: 900; color: #9a3412; flex: 0 0 auto; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; }
.faq details + details { margin-top: 12px; }
.faq summary { cursor: pointer; font-weight: 900; }
.comment { border-left: 4px solid var(--accent); }
.article-hero { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 12px; }
.article-body { margin-top: 20px; padding: 30px; }
.article-body p { font-size: 17px; }
.article-body figure { margin: 24px 0; }
.article-body figcaption { color: var(--muted); font-size: 14px; margin-top: 8px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 16px; overflow: hidden; }
th, td { padding: 13px 14px; border-bottom: 1px solid var(--line); text-align: left; }
th { background: #111827; color: #fff; }
.site-footer { background: #111827; color: #f9fafb; padding: 34px 20px; }
.site-footer a { color: #fde68a; }
.footer-brand { max-width: 1180px; margin: 0 auto 18px; display: flex; align-items: center; gap: 14px; }
.footer-brand img { width: 48px; height: 48px; border-radius: 14px; }
.site-footer > p { max-width: 1180px; margin-left: auto; margin-right: auto; color: #d1d5db; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
@media (max-width: 860px) {
  .topbar, .hero, .topic-band { grid-template-columns: 1fr; display: grid; }
  .topbar { justify-items: start; }
  .hero { display: grid; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr; }
  .search-wrap { grid-template-columns: 1fr; }
  h1 { letter-spacing: -1px; }
  .hero-panel { padding: 24px; min-height: auto; }
}