:root{color-scheme:light dark;--bg:#0b0d10;--card:#15191f;--text:#f3f5f7;--muted:#aab2bd;--line:#2a313a;--link:#8ec5ff}
@media(prefers-color-scheme:light){:root{--bg:#f7f8fa;--card:#fff;--text:#20242a;--muted:#626b76;--line:#e1e5ea;--link:#0b63ce}}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.7}
main{max-width:760px;margin:0 auto;padding:64px 24px 80px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px}
h1{font-size:2rem;line-height:1.25;margin:0 0 12px}h2{font-size:1.2rem;margin-top:2rem}.muted,footer{color:var(--muted)}a{color:var(--link)}
nav{margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}ul{padding-left:1.4rem}footer{margin-top:28px;font-size:.9rem}