:root{--bg:#0f172a;--card:#1e293b;--line:#334155;--txt:#e2e8f0;--mut:#94a3b8;--acc:#38bdf8;}
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:-apple-system,'Segoe UI','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--txt);line-height:1.75;font-size:16px;}
a{color:var(--acc);text-decoration:none;}
a:hover{text-decoration:underline;}
.topbar{display:flex;align-items:center;gap:10px;padding:16px 22px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(15,23,42,.94);backdrop-filter:blur(6px);z-index:9;}
.topbar img{width:28px;height:28px;}
.topbar b{color:#f1f5f9;font-size:16px;}
.topbar .sp{flex:1;}
.topbar .btn{background:linear-gradient(135deg,#3b82f6,#2563eb);color:#fff;padding:8px 18px;border-radius:8px;font-weight:700;font-size:14px;}
.topbar .btn:hover{opacity:.92;text-decoration:none;}
.wrap{max-width:820px;margin:0 auto;padding:30px 22px 70px;}
h1{font-size:27px;line-height:1.4;color:#f8fafc;margin-bottom:10px;}
h2{font-size:20px;color:#f1f5f9;margin:30px 0 10px;padding-left:12px;border-left:4px solid var(--acc);}
h3{font-size:17px;color:#e2e8f0;margin:20px 0 8px;}
p{margin:12px 0;color:#cbd5e1;}
ul,ol{margin:12px 0 12px 24px;color:#cbd5e1;}
li{margin:6px 0;}
.meta{color:var(--mut);font-size:13px;margin-bottom:20px;}
strong{color:#f1f5f9;}
code{background:#0b1220;border:1px solid var(--line);border-radius:5px;padding:1px 6px;font-size:13.5px;color:#7dd3fc;}
.cta{margin-top:36px;padding:24px;background:var(--card);border:1px solid var(--line);border-radius:14px;text-align:center;}
.cta h3{margin:0 0 6px;color:#f8fafc;font-size:18px;}
.cta p{color:var(--mut);font-size:14px;margin:6px 0 16px;}
.cta a.big{display:inline-block;background:linear-gradient(135deg,#3b82f6,#2563eb);color:#fff;padding:13px 32px;border-radius:10px;font-weight:700;}
.cta a.big:hover{opacity:.92;text-decoration:none;}
.tip{background:#111c30;border:1px solid var(--line);border-left:4px solid var(--acc);border-radius:8px;padding:14px 16px;margin:18px 0;font-size:14.5px;color:#cbd5e1;}
footer{border-top:1px solid var(--line);padding:26px 22px;text-align:center;color:var(--mut);font-size:13px;}
footer a{color:var(--mut);}
.cards{display:grid;gap:14px;margin-top:22px;}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;transition:.2s;}
.card:hover{border-color:var(--acc);transform:translateY(-2px);}
.card h3{margin:0 0 6px;font-size:17px;}
.card h3 a{color:#f1f5f9;}
.card p{margin:0;color:var(--mut);font-size:14px;}