:root{--fg:#1f2328;--muted:#6b7280;--line:#e5e7eb;--bg:#fbfbfc;--accent:#2563eb;--card:#fff}
@media (prefers-color-scheme:dark){:root{--fg:#e6e6e6;--muted:#9aa0a6;--line:#2b3038;--bg:#14161a;--accent:#7aa2f7;--card:#1b1e24}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans CJK SC","PingFang SC",sans-serif}
.wrap{max-width:46rem;margin:0 auto;padding:3.5rem 1.25rem 5rem}
header{display:flex;align-items:center;gap:.6rem;margin-bottom:.4rem}
.logo{width:1.5rem;height:1.5rem;border-radius:.4rem;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:.8rem;font-weight:700}
h1{font-size:1.6rem;margin:0 0 .3rem;letter-spacing:-.01em}
.sub{color:var(--muted);font-size:.92rem;margin-bottom:2.4rem}
nav{display:flex;gap:1rem;margin-bottom:2.4rem;font-size:.92rem}
nav a{color:var(--accent);text-decoration:none;border-bottom:1px solid transparent}
nav a:hover{border-color:currentColor}
.card{background:var(--card);border:1px solid var(--line);border-radius:.9rem;padding:1.6rem 1.5rem}
h2{font-size:1.02rem;margin:2rem 0 .6rem}
p{margin:.7rem 0}
ol,ul{margin:.6rem 0;padding-left:1.3rem}
li{margin:.5rem 0}
li::marker{color:var(--muted)}
a{color:var(--accent)}
code{background:rgba(127,127,127,.14);padding:.05rem .32rem;border-radius:.28rem;font-size:.92em}
footer{margin-top:3rem;color:var(--muted);font-size:.85rem;border-top:1px solid var(--line);padding-top:1.2rem}
.badge{display:inline-block;font-size:.75rem;color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:.08rem .5rem;margin-left:.4rem}