:root{--bg:#F7F6FC;--paper:#fff;--ink:#191627;--muted:#656a78;--line:#e8eaf0;--accent:#7657e8}
@media(prefers-color-scheme:dark){:root{--bg:#0f1117;--paper:#171a23;--ink:#eceef5;--muted:#a1a6b5;--line:#272b38;--accent:#a99bf5}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.top{position:sticky;top:0;background:var(--paper);border-bottom:1px solid var(--line);z-index:5}
.top div{max-width:820px;margin:0 auto;padding:12px 20px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.top b{font-size:21px;font-weight:800;letter-spacing:-.03em}.top b a.logo{display:inline-flex;align-items:center;gap:9px;color:var(--ink);text-decoration:none}.top b img{border-radius:7px;display:block}
.top nav{display:flex;gap:16px;font-size:14px}
a{color:var(--accent)}
main{max-width:820px;margin:0 auto;padding:28px 20px 70px}
.doc{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:28px 26px}
h1{font-size:30px;line-height:1.2;margin:0 0 6px;letter-spacing:-.02em}
h2{font-size:19px;margin:30px 0 8px;padding-top:6px}
h3{font-size:16px;margin:18px 0 4px}
p,li{margin:8px 0}
ul,ol{padding-left:22px}
.meta{color:var(--muted);font-size:14px;margin:0 0 18px}
.box{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:14px 0;font-size:15px}
.todo{background:#fff3b0;color:#4a3a00;border-radius:4px;padding:0 3px}
.toc{columns:2;column-gap:28px;font-size:14px;margin:14px 0 6px}
.toc a{display:block;text-decoration:none;padding:2px 0}
table{width:100%;border-collapse:collapse;font-size:14.5px;margin:10px 0}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
th{background:var(--bg)}
footer{max-width:820px;margin:0 auto;padding:0 20px 40px;color:var(--muted);font-size:13px}
@media(max-width:600px){.doc{padding:20px 16px}.toc{columns:1}h1{font-size:25px}}