:root{--bg:#fff;--text:#111;--muted:#5b616b;--accent:#0F766E;--card:#f3f4f6}
@media (prefers-color-scheme:dark){:root{--bg:#0b0c0e;--text:#f2f3f5;--muted:#a8adb5;--accent:#2DD4BF;--card:#1a1c20}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}h1{font-size:28px;margin:0 0 4px}h2{font-size:19px;margin:28px 0 6px}
.muted{color:var(--muted)}a{color:var(--accent)}.card{background:var(--card);border-radius:14px;padding:16px;margin:16px 0}
nav{display:flex;gap:16px;margin-bottom:24px;font-size:15px}ul{padding-left:20px}