:root{--bg:#090C10;--surface:#12161F;--line:rgba(255,255,255,.08);--text:#F0F4F8;--muted:#9AA6B6;--amber:#F59E0B}
@media (prefers-color-scheme:light){:root{--bg:#F6F7F9;--surface:#fff;--line:rgba(9,12,16,.1);--text:#0D1117;--muted:#4B5563;--amber:#B45309}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif}
a{color:var(--amber)}a:hover{text-decoration-thickness:2px}
.wrap{max-width:720px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}header .wrap{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px 0;min-height:64px;padding-top:8px;padding-bottom:8px}
header img{height:26px;display:block}
nav a{color:var(--muted);text-decoration:none;margin-left:14px;font-size:15px}nav a:hover{color:var(--text)}
main{padding:48px 0 64px}h1{font-size:34px;line-height:1.2;margin:0 0 8px}h2{font-size:21px;margin:36px 0 8px}
.lead{color:var(--muted);font-size:19px;margin:0 0 28px}.meta{color:var(--muted);font-size:14px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:20px 0}
.todo{background:rgba(245,158,11,.14);border:1px dashed var(--amber);border-radius:6px;padding:1px 6px}
ul{padding-left:22px}li{margin:4px 0}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:14px;padding:24px 0}footer .wrap{display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between}footer a{color:var(--muted)}