:root{--bg:#F3EDE2;--ink:#1C1917;--soft:#57534E;--muted:#78716C;--accent:#0E7C73;--card:rgba(255,255,255,.55);--line:rgba(28,25,23,.1)}
@media(prefers-color-scheme:dark){:root{--bg:#0F1114;--ink:#F5F1EA;--soft:#B8B2A8;--muted:#A8A29E;--accent:#5FD3C6;--card:rgba(255,255,255,.06);--line:rgba(255,255,255,.1)}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 -apple-system,"SF Pro Text",system-ui,"Segoe UI",sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 20px 80px}
header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:32px}
.brand{font-weight:800;font-size:22px;letter-spacing:-.02em;color:var(--ink);text-decoration:none}
nav a{color:var(--soft);text-decoration:none;font-weight:600;font-size:14px;margin-left:14px}
nav a:hover,a{color:var(--accent)}
h1{font-size:34px;letter-spacing:-.02em;line-height:1.1;margin:0 0 6px}
.sub{color:var(--soft);margin:0 0 28px}
h2{font-size:20px;margin:32px 0 8px}
p,li{color:var(--ink)}ul{padding-left:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:18px 20px;margin:16px 0}
.muted{color:var(--muted);font-size:14px}
footer{margin-top:48px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}