:root{--fg:#1d1d1f;--muted:#6e6e73;--bg:#f5f5f7;--card:#ffffff;--accent:#0071e3;--line:#e5e5ea;--ok:#0e7c63}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--fg);background:var(--bg);line-height:1.75;font-size:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:12px 20px}
.topbar .in{max-width:880px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}
.topbar .brand{font-weight:700;color:var(--fg)}
.topbar nav a{margin-left:14px;font-size:14px;color:var(--muted)}
.wrap{max-width:880px;margin:0 auto;padding:28px 20px 60px}
.crumb{font-size:13px;color:var(--muted);margin-bottom:18px}
h1{font-size:30px;line-height:1.3;margin-bottom:10px;letter-spacing:-.02em}
.lead{color:var(--muted);margin-bottom:26px}
h2{font-size:21px;margin:34px 0 12px}
h3{font-size:17px;margin:20px 0 8px}
p{margin-bottom:12px}
ul,ol{margin:0 0 14px 22px}
li{margin-bottom:6px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin-bottom:16px}
table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:14.5px;margin:12px 0 6px;display:block;overflow-x:auto}
th,td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;white-space:normal;vertical-align:top}
th{background:#fafafa;font-weight:600}
tr:last-child td{border-bottom:none}
.note{font-size:13px;color:var(--muted);margin-bottom:20px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
.faq summary{font-weight:600;cursor:pointer}
.faq details p{margin:10px 0 2px;color:#3a3a3c}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:9px 20px;border-radius:980px;font-size:15px}
.btn:hover{text-decoration:none;opacity:.9}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:16px 0}
.grid a.tile{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;color:var(--fg)}
.grid a.tile:hover{border-color:var(--accent);text-decoration:none}
.tile b{display:block;margin-bottom:4px}
.tile span{font-size:13px;color:var(--muted)}
footer{border-top:1px solid var(--line);margin-top:44px;padding-top:18px;font-size:13px;color:var(--muted)}
footer a{margin-right:12px}
.tag{display:inline-block;background:#eef6ee;color:var(--ok);border-radius:6px;padding:1px 8px;font-size:12.5px;margin-right:6px}