:root {
  --text: #252638;
  --muted: #6b6f82;
  --line: #e9edf5;
  --card: #ffffff;
  --soft: #f7f9fc;
  --accent: #ff7c6e;
  --accent-2: #46c7d6;
  --shadow: 0 20px 60px rgba(31, 42, 68, .10);
  --radius: 28px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fffaf6 0%, #f7fbff 44%, #ffffff 100%);
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 14px 0; }
.brand-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.brand-logo img { width: 92px; height: 42px; object-fit: contain; }
.main-nav { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
.main-nav a { padding: 8px 12px; border-radius: 999px; color: var(--muted); font-size: 14px; }
.main-nav a:hover, .main-nav a.active { background: #fff0ec; color: #d64c3d; }
.search-panel { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center; padding: 0 0 14px; }
.search-panel input { border: 1px solid var(--line); border-radius: 999px; padding: 13px 18px; font-size: 15px; background: white; outline: none; }
.search-panel input:focus { border-color: var(--accent-2); box-shadow: 0 0 0 4px rgba(70, 199, 214, .12); }
.search-panel button, .btn, .share-btn { border: 0; border-radius: 999px; padding: 13px 20px; background: var(--text); color: white; font-weight: 700; cursor: pointer; }
.search-panel p { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; }
.hero { padding: 66px 0 34px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(320px, .98fr); gap: 34px; align-items: center; }
.eyebrow { display: inline-flex; gap: 8px; align-items: center; color: #d64c3d; background: #fff0ec; padding: 7px 12px; border-radius: 999px; font-weight: 700; font-size: 14px; }
h1, h2, h3 { line-height: 1.18; margin: 0 0 14px; }
h1 { font-size: clamp(36px, 6vw, 70px); letter-spacing: -.055em; }
h2 { font-size: clamp(26px, 3.4vw, 42px); letter-spacing: -.03em; }
h3 { font-size: 21px; }
p { margin: 0 0 14px; }
.lead { color: var(--muted); font-size: 18px; max-width: 660px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.btn.secondary { background: white; color: var(--text); border: 1px solid var(--line); }
.hero-card { background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.hero-card figure { margin: 0; position: relative; }
.hero-card figcaption, .video-card figcaption { color: var(--muted); font-size: 13px; padding: 10px 14px; }
.kpi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding: 18px; }
.kpi { background: var(--soft); border-radius: 18px; padding: 14px; text-align: center; }
.kpi strong { display: block; font-size: 24px; }
.section { padding: 54px 0; }
.section-head { display: flex; justify-content: space-between; gap: 20px; align-items: flex-end; margin-bottom: 24px; }
.section-head p { color: var(--muted); max-width: 720px; }
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.card.small { padding: 18px; }
.video-card { background: white; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.video-card figure { margin: 0; position: relative; background: var(--soft); }
.video-shell { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.play-button { position: absolute; inset: 50% auto auto 50%; transform: translate(-50%, -50%) scale(.88); width: 68px; height: 68px; border-radius: 999px; border: 0; background: rgba(255,255,255,.9); color: var(--text); box-shadow: var(--shadow); opacity: 0; transition: .2s ease; cursor: pointer; }
.video-card:hover .play-button, .play-button.visible, .video-card.is-previewed .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-card-body { padding: 20px; }
.video-stats { color: #d64c3d; font-weight: 700; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags span { background: #eefbfc; color: #13717b; border-radius: 999px; padding: 5px 10px; font-size: 13px; }
.timeline { counter-reset: step; display: grid; gap: 14px; }
.timeline li { list-style: none; background: white; border: 1px solid var(--line); border-radius: 20px; padding: 18px 18px 18px 58px; position: relative; }
.timeline li::before { counter-increment: step; content: counter(step); position: absolute; left: 18px; top: 18px; width: 28px; height: 28px; border-radius: 50%; background: var(--text); color: white; display: grid; place-items: center; font-weight: 700; }
.review { display: grid; gap: 8px; }
.review strong { font-size: 18px; }
.review-meta { color: var(--muted); font-size: 14px; }
.faq-list { display: grid; gap: 12px; }
details { background: white; border: 1px solid var(--line); border-radius: 18px; padding: 16px 18px; }
summary { cursor: pointer; font-weight: 800; }
.cta-band { background: linear-gradient(135deg, #fff0ec, #ecfbff); border: 1px solid var(--line); border-radius: 34px; padding: 36px; display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; }
.breadcrumb { color: var(--muted); margin: 22px 0 0; font-size: 14px; }
.page-hero { padding: 44px 0 16px; }
.article-body { background: white; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.article-body ul { padding-left: 20px; }
.json-links { display: flex; flex-wrap: wrap; gap: 10px; }
.json-links a { background: white; border: 1px solid var(--line); border-radius: 999px; padding: 9px 13px; color: var(--muted); }
.site-footer { margin-top: 54px; background: #202235; color: #f7f9ff; padding: 46px 0 18px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .9fr .8fr; gap: 28px; }
.footer-logo { width: 126px; margin-bottom: 14px; }
.site-footer p, .site-footer a { color: #cfd4e6; }
.site-footer a { display: block; margin: 8px 0; }
.copyright { text-align: center; border-top: 1px solid rgba(255,255,255,.12); margin: 28px auto 0; padding-top: 18px; width: min(1180px, calc(100% - 32px)); }
@media (max-width: 920px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .main-nav { justify-content: flex-start; }
  .hero-grid, .grid-3, .grid-2, .footer-grid, .cta-band { grid-template-columns: 1fr; }
  .search-panel { grid-template-columns: 1fr; }
  .section-head { display: block; }
}
@media (max-width: 520px) {
  .main-nav a { width: calc(50% - 4px); text-align: center; }
  .kpi-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 34px; }
}