:root{--bg:#eef3f6;--card:#fff;--text:#1b1b1b;--muted:#5b6670;--accent:#0078d4;--line:#e3e8ec}
@media (prefers-color-scheme:dark){:root{--bg:#16191c;--card:#1f2327;--text:#eef1f3;--muted:#a3adb5;--accent:#4aa3ff;--line:#2c3237}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:48px 20px 64px}header{margin-bottom:28px}
h1{font-size:34px;line-height:1.2;margin:0 0 8px;letter-spacing:-.5px}h2{font-size:20px;margin:28px 0 8px}
p,li{color:var(--text)}.muted{color:var(--muted)}a{color:var(--accent)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 24px;margin:16px 0}
nav a{margin-right:16px;font-weight:600;text-decoration:none}footer{margin-top:40px;font-size:14px;color:var(--muted)}
ul{padding-left:22px}