:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #667085;
  --line: #e5e7ef;
  --accent: #1457d9;
  --accent-soft: #eaf1ff;
  --warm: #fff7e8;
  --shadow: 0 18px 45px rgba(15, 23, 42, .08);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  background: linear-gradient(135deg, #101a33 0%, #123b8b 56%, #0d73d9 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.site-header::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -120px;
  top: -160px;
  background: rgba(255,255,255,.12);
  border-radius: 999px;
}
.topbar, .footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.topbar { padding: 22px 0 12px; position: relative; z-index: 1; }
.logo { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .02em; }
.logo-mark { width: 42px; height: 42px; border-radius: 14px; background: #fff; color: var(--accent); display: grid; place-items: center; box-shadow: 0 10px 24px rgba(0,0,0,.15); }
.logo-text { font-size: 1.2rem; }
.update-pill { background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.2); padding: 8px 12px; border-radius: 999px; font-size: .92rem; }
.main-nav { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 8px; padding: 6px 0 20px; }
.main-nav a { padding: 10px 14px; border-radius: 999px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.16); }
.main-nav a:hover { background: #fff; color: var(--accent); }
.search-wrap { position: relative; z-index: 1; padding-bottom: 26px; }
.fake-search { display: flex; gap: 10px; background: #fff; padding: 10px; border-radius: 18px; box-shadow: var(--shadow); }
.fake-search input { flex: 1; border: 0; outline: 0; font-size: 1rem; padding: 12px; color: var(--ink); }
.fake-search button, .btn { border: 0; border-radius: 14px; padding: 12px 18px; background: var(--accent); color: #fff; font-weight: 700; cursor: pointer; }
.search-note { margin: 10px 4px 0; color: rgba(255,255,255,.82); font-size: .92rem; min-height: 1.6em; }
.hero { padding: 42px 0 22px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(300px, .75fr); gap: 22px; }
.card, .module, .article-card, .panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.hero-card { padding: 28px; }
.eyebrow { display: inline-flex; gap: 8px; align-items: center; color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 999px; font-weight: 700; font-size: .9rem; }
h1 { font-size: clamp(2rem, 5vw, 3.7rem); line-height: 1.08; margin: 18px 0; letter-spacing: -.04em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.15rem); line-height: 1.18; margin: 0 0 14px; }
h3 { font-size: 1.15rem; line-height: 1.36; margin: 0 0 10px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.meta { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: .92rem; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tag { padding: 6px 10px; border-radius: 999px; background: #f1f5ff; color: #2452a8; font-size: .86rem; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0; }
.stat { background: #f8fafc; border: 1px solid var(--line); border-radius: 16px; padding: 12px; text-align: center; }
.stat strong { display: block; color: var(--accent); font-size: 1.12rem; }
.section { padding: 34px 0; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 14px; margin-bottom: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.module { padding: 20px; }
.article-card { display: flex; flex-direction: column; }
.article-body { padding: 18px; }
.video-card { position: relative; overflow: hidden; background: #0b1220; min-height: 210px; }
.video-card video, .video-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; opacity: .96; }
.play-badge { position: absolute; inset: 0; display: grid; place-items: center; color: #fff; background: rgba(10, 16, 28, .18); opacity: 0; transition: .25s ease; }
.play-badge span { width: 64px; height: 64px; border-radius: 999px; background: rgba(255,255,255,.9); color: var(--accent); display: grid; place-items: center; font-weight: 900; box-shadow: 0 16px 40px rgba(0,0,0,.28); transform: scale(.92); transition: .25s ease; }
.video-card:hover .play-badge, .video-card:focus-within .play-badge { opacity: 1; }
.video-card:hover .play-badge span { transform: scale(1); }
figcaption { color: var(--muted); font-size: .9rem; padding: 8px 0 0; }
.side-list { padding: 18px; display: grid; gap: 14px; }
.side-item { padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.side-item:last-child { border-bottom: 0; padding-bottom: 0; }
.author { display: flex; gap: 14px; align-items: flex-start; }
.author img { width: 66px; height: 66px; border-radius: 20px; background: #edf2ff; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 16px 18px; box-shadow: 0 12px 30px rgba(15,23,42,.04); }
.faq details + details { margin-top: 12px; }
.faq summary { cursor: pointer; font-weight: 800; }
.comment { padding: 18px; }
.comment strong { color: var(--accent); }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 22px; align-items: start; }
.article-main { padding: 26px; }
.article-main h1 { color: var(--ink); font-size: clamp(1.9rem, 4vw, 3rem); }
.article-main p { font-size: 1.03rem; }
.breadcrumb { color: var(--muted); font-size: .92rem; margin-bottom: 12px; }
.breadcrumb a { color: var(--accent); }
.article-main ul { padding-left: 1.2rem; }
.notice { background: var(--warm); border: 1px solid #ffe0a6; border-radius: 18px; padding: 16px; }
.site-footer { background: #0d1424; color: #d9e2f2; margin-top: 42px; padding: 34px 0; }
.site-footer a { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 20px; margin-top: 22px; }
.footer-card { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1); border-radius: 18px; padding: 16px; }
.domain-text { font-weight: 700; }
@media (max-width: 920px) {
  .hero-grid, .article-layout, .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
  .section-head { align-items: flex-start; flex-direction: column; }
  .stats { grid-template-columns: 1fr 1fr 1fr; }
}
@media (max-width: 640px) {
  .topbar, .footer-inner { align-items: flex-start; flex-direction: column; }
  .fake-search { flex-direction: column; }
  .stats { grid-template-columns: 1fr; }
  .main-nav a { flex: 1 1 auto; text-align: center; }
  .play-badge { opacity: 1; }
}