:root{
  --bg:#0b0b0d;
  --surface:#121216;
  --border:#23232a;
  --text:#f5f5f6;
  --muted:#b9b9c2;
  --accent:#2ed3b7;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--accent);text-decoration:none}
.container{max-width:920px;margin:0 auto;padding:24px}
.nav{display:flex;gap:14px;align-items:center;justify-content:space-between;padding:14px 18px;border:1px solid var(--border);border-radius:16px;background:rgba(18,18,22,.7)}
.h1{font-size:34px;line-height:1.1;margin:22px 0 8px}
.sub{color:var(--muted);margin:0 0 18px;font-size:16px}
.card{border:1px solid var(--border);border-radius:18px;background:var(--surface);padding:18px}