:root{
  --bg:#f7f8fb;
  --surface:#ffffff;
  --surface-2:#f1f5f9;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --brand:#111827;
  --accent:#334155;
  --radius:28px;
  --shadow:0 24px 70px rgba(15,23,42,.08);
  --shadow-soft:0 14px 34px rgba(15,23,42,.06);
  --max:1180px;
}
*{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;
  color:var(--text);
  background:radial-gradient(circle at 10% 0%,#fff 0,#f7f8fb 34%,#f4f6fa 100%);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
button,input,textarea{font:inherit}
.skip-link{position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:20px;top:20px;width:auto;height:auto;padding:10px 14px;background:#fff;border:1px solid var(--line);border-radius:12px;z-index:100}
.container{width:min(100% - 32px,var(--max));margin-inline:auto}
.site-header{
  position:sticky;top:0;z-index:50;
  border-bottom:1px solid rgba(226,232,240,.78);
  background:rgba(247,248,251,.82);
  backdrop-filter:blur(18px);
}
.header-inner{padding:18px 0 14px}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:-.03em}
.logo img{width:110px;height:36px}
.nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.nav a{
  padding:9px 12px;border-radius:999px;color:#475569;font-size:14px;
  transition:background .22s ease,color .22s ease,transform .22s ease
}
.nav a:hover,.nav a[aria-current="page"]{background:#fff;color:#0f172a;box-shadow:var(--shadow-soft);transform:translateY(-1px)}
.search-wrap{
  margin-top:16px;display:flex;align-items:center;gap:10px;
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 8px 8px 18px;
  box-shadow:0 10px 30px rgba(15,23,42,.04)
}
.search-wrap input{width:100%;border:0;outline:0;background:transparent;color:var(--text);min-height:42px}
.search-wrap button,.btn{
  border:0;background:#0f172a;color:#fff;border-radius:999px;padding:11px 18px;
  cursor:pointer;transition:transform .22s ease,box-shadow .22s ease,background .22s ease;
  white-space:nowrap
}
.search-wrap button:hover,.btn:hover{transform:translateY(-2px);box-shadow:0 18px 32px rgba(15,23,42,.18);background:#1f2937}
.search-message{margin:10px 0 0;color:var(--muted);font-size:14px;min-height:22px}
.hero{padding:88px 0 58px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#475569;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 12px;font-size:14px;box-shadow:var(--shadow-soft)}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 6px rgba(34,197,94,.12)}
h1,h2,h3,h4{line-height:1.12;letter-spacing:-.045em;margin:0}
h1{font-size:clamp(42px,6vw,82px);margin-top:24px}
.hero p{font-size:18px;color:var(--muted);max-width:700px;margin:24px 0 0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:32px}
.btn.secondary{background:#fff;color:#0f172a;border:1px solid var(--line);box-shadow:var(--shadow-soft)}
.domain-chip{margin-top:22px;color:#64748b;font-size:14px}
.hero-card{
  border:1px solid var(--line);border-radius:var(--radius);background:rgba(255,255,255,.72);
  box-shadow:var(--shadow);padding:16px;overflow:hidden
}
.hero-card img{border-radius:22px;aspect-ratio:16/10;object-fit:cover}
.hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
.metric{background:#f8fafc;border:1px solid var(--line);border-radius:18px;padding:12px;text-align:center}
.metric strong{display:block;font-size:21px}
.metric span{font-size:12px;color:var(--muted)}
.section{padding:72px 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px}
.section-head p{max-width:620px;color:var(--muted);margin:10px 0 0}
.section-title{font-size:clamp(28px,4vw,46px)}
.intro-panel{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.intro-card,.board-card,.review-card,.faq-card,.inner-card,.contact-card{
  background:rgba(255,255,255,.78);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-soft);
}
.intro-card{padding:30px}
.intro-card h3{font-size:24px;margin-bottom:12px}
.intro-card p{color:var(--muted);margin:0}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.video-card{
  background:#fff;border:1px solid var(--line);border-radius:28px;overflow:hidden;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease
}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:#cbd5e1}
.video-shell{position:relative;overflow:hidden;background:#e2e8f0}
.video-shell img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .4s ease,filter .4s ease}
.video-card:hover .video-shell img{transform:scale(1.035);filter:saturate(1.05) contrast(1.02)}
.play-button{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.88);
  width:64px;height:64px;border-radius:50%;border:1px solid rgba(255,255,255,.7);
  background:rgba(15,23,42,.72);color:#fff;display:grid;place-items:center;
  opacity:0;transition:opacity .25s ease,transform .25s ease;backdrop-filter:blur(10px)
}
.video-card:hover .play-button,.video-card:focus-within .play-button{opacity:1;transform:translate(-50%,-50%) scale(1)}
.card-body{padding:20px}
.card-body h3{font-size:20px;margin-bottom:10px;letter-spacing:-.03em}
.card-body p{color:var(--muted);font-size:15px;margin:0 0 14px}
.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.tag{font-size:12px;color:#334155;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:999px;padding:5px 9px}
.stats{display:flex;gap:12px;flex-wrap:wrap;color:#64748b;font-size:13px}
.image-description{font-size:12px;color:#64748b;margin:10px 0 0}
.board-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.board-card{padding:24px;transition:transform .25s ease,box-shadow .25s ease}
.board-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.board-card h3{font-size:21px;margin-bottom:10px}
.board-card p{color:var(--muted);font-size:15px;margin:0}
.data-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.data-item{padding:24px;background:#0f172a;color:#fff;border-radius:26px}
.data-item strong{font-size:32px;display:block;letter-spacing:-.04em}
.data-item span{color:#cbd5e1;font-size:14px}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.review-card{padding:24px}
.review-card p{margin:0 0 16px;color:#334155}
.review-card strong{display:block}
.review-card span{font-size:13px;color:var(--muted)}
.faq-list{display:grid;gap:12px}
.faq-card{padding:0;overflow:hidden}
.faq-card summary{cursor:pointer;padding:20px 24px;font-weight:700;list-style:none}
.faq-card summary::-webkit-details-marker{display:none}
.faq-card summary::after{content:"+";float:right;color:#64748b}
.faq-card[open] summary::after{content:"−"}
.faq-card p{margin:0;padding:0 24px 22px;color:var(--muted)}
.contact-card{padding:28px;display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
.form-grid{display:grid;gap:12px}
.form-grid input,.form-grid textarea{
  width:100%;border:1px solid var(--line);border-radius:18px;padding:13px 15px;outline:0;background:#fff
}
.form-grid textarea{min-height:116px;resize:vertical}
.breadcrumb{padding-top:24px;color:#64748b;font-size:14px}
.breadcrumb a{color:#0f172a}
.inner-hero{padding:58px 0 36px}
.inner-hero p{max-width:760px;color:var(--muted);font-size:18px}
.inner-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.inner-card{padding:26px}
.inner-card h2,.inner-card h3{font-size:26px;margin-bottom:12px}
.inner-card p,.inner-card li{color:var(--muted)}
.inner-card ul{padding-left:18px;margin:12px 0 0}
.page-list{display:grid;gap:12px}
.page-item{display:flex;justify-content:space-between;gap:20px;padding:18px 20px;border:1px solid var(--line);border-radius:22px;background:#fff}
.page-item span{color:var(--muted)}
.site-footer{margin-top:72px;padding:44px 0 34px;background:#0f172a;color:#e5e7eb}
.footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:24px}
.footer-logo{display:flex;align-items:center;gap:12px;font-weight:800}
.footer-logo img{width:96px}
.footer-muted{color:#94a3b8;font-size:14px;margin-top:12px}
.footer-links{display:grid;gap:8px}
.footer-links a{color:#cbd5e1}
.footer-bottom{border-top:1px solid rgba(148,163,184,.24);margin-top:28px;padding-top:18px;color:#94a3b8;font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.notice{padding:14px 16px;border-radius:18px;background:#f8fafc;border:1px solid var(--line);color:#475569}
@media (max-width: 960px){
  .hero-grid,.intro-panel,.contact-card,.footer-grid{grid-template-columns:1fr}
  .video-grid,.board-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
  .data-strip{grid-template-columns:repeat(2,1fr)}
  .top-row{align-items:flex-start;flex-direction:column}
  .nav{justify-content:flex-start}
}
@media (max-width: 640px){
  .container{width:min(100% - 22px,var(--max))}
  .hero{padding:54px 0 34px}
  .section{padding:48px 0}
  .video-grid,.board-grid,.review-grid,.data-strip,.inner-grid{grid-template-columns:1fr}
  .section-head{display:block}
  .search-wrap{border-radius:24px;align-items:stretch;flex-direction:column;padding:12px}
  .search-wrap button{width:100%}
  .page-item{display:block}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}