:root{--bg:#0f1419;--card:#161d25;--ink:#e6edf3;--muted:#9aa7b4;--accent:#5eb3ff;--line:#26313d}
@media (prefers-color-scheme: light){:root{--bg:#f6f8fa;--card:#fff;--ink:#1b2430;--muted:#5a6876;--accent:#0b6bcb;--line:#dde3ea}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 20px}
header{padding-top:40px;display:flex;align-items:center;gap:14px}
.logo{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,var(--accent),#7c5cff);display:grid;place-items:center;color:#fff;font-weight:800;font-size:22px}
h1{font-size:28px;margin:0}header p{margin:2px 0 0;color:var(--muted);font-size:14px}
nav{max-width:760px;margin:18px auto 0;padding:0 20px;display:flex;gap:18px;flex-wrap:wrap}
nav a{color:var(--accent);text-decoration:none;font-weight:600}nav a:hover{text-decoration:underline}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px 24px;margin:22px 0}
h2{font-size:20px;margin:0 0 8px}h3{font-size:16px;margin:18px 0 4px}
ul{padding-left:20px}li{margin:4px 0}a{color:var(--accent)}
.muted{color:var(--muted);font-size:14px}footer{padding:10px 20px 40px;color:var(--muted);font-size:13px}