:root{--bg:#f6f6f4;--surface:#fff;--surface-2:#f0f0ed;--line:#e4e4df;--text:#17171a;--text-2:#55555c;--muted:#8a8a91;--code:#f0f0ed}
@media (prefers-color-scheme:dark){:root{--bg:#111113;--surface:#1b1b1e;--surface-2:#26262b;--line:#2f2f35;--text:#f2f2f0;--text-2:#b6b6bd;--muted:#86868e;--code:#26262b}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 -apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif}
main{max-width:860px;margin:0 auto;padding:40px 20px 80px}
h1{font-size:30px;margin:0 0 6px}h2{font-size:20px;margin:40px 0 12px;padding-top:12px;border-top:1px solid var(--line)}h3{font-size:16px;margin:22px 0 6px}
p{margin:8px 0}.sub{color:var(--text-2);margin:0 0 24px}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;background:var(--code);padding:2px 6px;border-radius:5px}
pre{background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:14px 16px;overflow:auto}pre code{background:none;padding:0;font-size:13.5px}
table{width:100%;border-collapse:collapse;margin:12px 0;font-size:15px}th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--text-2);font-weight:500}
ol,ul{padding-left:22px}li{margin:4px 0}.note{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:14px 0}
a{color:inherit}.top{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px;font-size:14px;color:var(--muted)}.top a{text-decoration:none}

.ai-copy{margin:0 0 1.5rem;padding:.9rem 1rem;border:1px solid var(--line,#2a3140);border-radius:8px;background:rgba(124,138,255,.06)}
.ai-copy button{font:inherit;padding:.45rem .9rem;border:1px solid #7c8aff;border-radius:6px;background:#7c8aff;color:#fff;cursor:pointer;margin-right:.6rem}
.ai-copy button:hover{filter:brightness(1.1)}

.top .brand-back { display: inline-flex; align-items: center; gap: 8px; }
.top .brand-back svg { width: 20px; height: 20px; flex: none; fill: currentColor; }