:root{
  --bg:#f7f9fc; --card:#ffffff; --text:#1d1d1f; --muted:#6b7280;
  --primary:#2b6cb0; --primary-soft:#e8f0fb; --border:#e5e7eb; --accent:#0f766e;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:960px;margin:0 auto;padding:0 20px}
header.site{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{font-weight:700;font-size:18px;display:flex;align-items:center;gap:8px}
.brand .logo{width:28px;height:28px;border-radius:7px;background:linear-gradient(135deg,#2b6cb0,#0f766e);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px}
.nav-links{display:flex;gap:18px;font-size:14px}
.hero{padding:64px 0 40px;text-align:center}
.hero h1{font-size:34px;margin:0 0 12px}
.hero p{font-size:17px;color:var(--muted);max-width:640px;margin:0 auto 24px}
.btn{display:inline-block;background:var(--primary);color:#fff;padding:11px 22px;border-radius:10px;font-weight:600}
.btn:hover{text-decoration:none;opacity:.92}
.btn.secondary{background:var(--card);color:var(--primary);border:1px solid var(--primary)}
.features{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:32px 0}
.feature{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px}
.feature h3{margin:0 0 8px;font-size:16px}
.feature p{margin:0;color:var(--muted);font-size:14px}
.section{padding:40px 0}
.section h2{font-size:24px;margin:0 0 16px}
footer.site{background:var(--card);border-top:1px solid var(--border);padding:28px 0;margin-top:40px;color:var(--muted);font-size:13px}
footer .container{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;align-items:center}
.content{max-width:820px;margin:0 auto;padding:40px 20px 20px}
.content h1{font-size:28px}
.content h2{font-size:20px;margin-top:32px;border-left:4px solid var(--primary);padding-left:10px}
.content ul{padding-left:22px}
.note{background:#fff7ed;border:1px solid #fdba74;border-radius:10px;padding:12px 16px;font-size:14px;color:#9a3412;margin:16px 0}
.placeholder{background:#fef9c3;border:1px solid #facc15;border-radius:8px;padding:2px 8px;font-size:13px;color:#713f12}
.contact-box{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:24px;margin:20px 0}
@media(max-width:640px){.features{grid-template-columns:1fr}.nav-links{display:none}}