:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --ink:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg-soft:#f6f9ff;
  --shadow:0 16px 40px rgba(15,23,42,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:92px}
body{
  color:var(--ink);
  background:var(--bg-soft);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}
.container{width:min(1120px,calc(100% - 48px));margin:0 auto}
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.9);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(12px);
}
.nav-inner{height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:18px;font-weight:700}
.brand img{width:34px;height:34px}
.back-link{display:inline-flex;align-items:center;gap:7px;color:var(--muted);font-size:14px;font-weight:600}
.back-link::before{content:"\2190";font-size:18px;line-height:1}
.legal-hero{background:linear-gradient(180deg,#eef4ff 0%,#f6f9ff 100%);border-bottom:1px solid var(--line)}
.hero-inner{padding:56px 0 46px}
.eyebrow{color:var(--primary);font-size:13px;font-weight:700;letter-spacing:1px}
h1{margin-top:10px;font-size:38px;line-height:1.35;letter-spacing:0;font-weight:800}
.hero-description{max-width:720px;margin-top:14px;color:var(--muted);font-size:15px}
.legal-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px;align-items:start;padding:36px 0 72px}
.toc{
  position:sticky;top:88px;padding:20px;background:#fff;border:1px solid var(--line);
  border-radius:8px;box-shadow:0 8px 24px rgba(15,23,42,.05);
}
.toc-title{font-size:13px;font-weight:700;color:var(--ink);margin-bottom:10px}
.toc ol{list-style:none;display:grid;gap:2px}
.toc a{display:block;padding:7px 10px;border-radius:6px;color:var(--muted);font-size:13px;line-height:1.45}
.toc a:hover{color:var(--primary);background:#eff6ff}
.legal-card{background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:48px 56px}
.lead{padding-bottom:30px;border-bottom:1px solid var(--line);color:#334155;font-size:15.5px}
.lead strong{display:block;margin-bottom:8px;color:var(--ink);font-size:16px}
.legal-section{padding-top:36px}
.legal-section+h2,.legal-section+section{margin-top:0}
.legal-section h2{margin-bottom:16px;font-size:22px;line-height:1.45;letter-spacing:0}
.legal-section h3{margin:24px 0 8px;font-size:16px;line-height:1.6}
.legal-section p{margin:12px 0;color:#334155;font-size:15px}
.legal-section ol{margin:10px 0 16px 1.55em;color:#334155;font-size:15px}
.legal-section li{padding-left:5px;margin:7px 0}
.notice{margin:24px 0 2px;padding:17px 20px;border-left:3px solid var(--primary);background:#eff6ff;color:#334155;font-size:14.5px}
.sdk-block{margin-top:18px;padding:20px 22px;border:1px solid var(--line);border-radius:8px;background:#f8fafc}
.sdk-block h3{margin:0 0 10px}
.sdk-block p{margin:7px 0;font-size:14px}
.sdk-block a{overflow-wrap:anywhere}
.footer{background:#0f172a;color:#94a3b8;padding:48px 0 28px}
.footer-inner{display:flex;justify-content:space-between;gap:24px;align-items:center;flex-wrap:wrap}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700}
.footer-brand img{display:block;width:28px;height:28px}
.footer-links{display:flex;align-items:center;flex-wrap:wrap}
.footer-links a{color:#94a3b8;font-size:13.5px;margin-left:22px;transition:color .2s}
.footer-bottom{border-top:1px solid #1e293b;margin-top:32px;padding-top:20px;display:flex;justify-content:space-between;align-items:center;font-size:13px;flex-wrap:wrap;gap:8px}
.footer-bottom a{color:#94a3b8;transition:color .2s;display:inline-flex;align-items:center}
.beian-icon{display:block;width:14px;height:14px;margin-right:5px;vertical-align:middle}
.footer a{color:#94a3b8}
.footer a:hover{color:#fff}
@media (max-width:860px){
  .legal-layout{grid-template-columns:1fr;padding-top:24px}
  .toc{position:static}
  .toc ol{grid-template-columns:repeat(2,minmax(0,1fr))}
  .legal-card{padding:38px 34px}
}
@media (max-width:600px){
  .container{width:min(100% - 32px,1120px)}
  .nav-inner{height:58px}
  .brand{font-size:16px}
  .brand img{width:30px;height:30px}
  .back-link{font-size:13px}
  .hero-inner{padding:38px 0 32px}
  h1{font-size:29px}
  .legal-layout{gap:18px;padding-bottom:48px}
  .toc{padding:16px}
  .toc ol{grid-template-columns:1fr 1fr}
  .toc a{padding:6px;font-size:12.5px}
  .legal-card{padding:30px 20px}
  .lead{font-size:14.5px}
  .legal-section{padding-top:30px}
  .legal-section h2{font-size:20px}
  .legal-section p,.legal-section ol{font-size:14.5px}
  .footer-inner{align-items:flex-start;flex-direction:column}
  .footer-links{gap:10px 18px}
  .footer-links a{margin-left:0}
}