:root{
  --bg: #0b0d10;
  --fg: #e7ecef;
  --muted: #9aa5b1;
  --accent: #4f9cf9;
  --card: #12161b;
  --border: #1d232b;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--fg);line-height:1.6}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:880px;margin:0 auto;padding:32px}
.header{display:flex;align-items:center;gap:16px;margin-top:24px}
.logo{width:52px;height:52px;border-radius:12px;background:linear-gradient(135deg,#1f2937, #10151b);display:flex;align-items:center;justify-content:center;border:1px solid var(--border);box-shadow:0 6px 24px rgba(0,0,0,.35)}
.logo span{font-weight:800;font-size:22px;letter-spacing:.5px}
.title{font-size:28px;margin:0}
.subtitle{margin:0;color:var(--muted)}
.nav{margin-top:16px;display:flex;gap:18px}
.nav a{padding:8px 12px;border:1px solid var(--border);border-radius:10px;background:var(--card)}
.card{margin-top:28px;padding:24px;border:1px solid var(--border);border-radius:16px;background:var(--card)}
.footer{margin:48px 0;color:var(--muted);font-size:14px}
ul{padding-left:20px}
code{background:#0f141a;border:1px solid var(--border);padding:2px 6px;border-radius:6px}
.btn{display:inline-block;margin-top:12px;padding:10px 14px;border-radius:10px;border:1px solid var(--border);background:var(--accent);color:#081018;font-weight:700}
.small{font-size:14px;color:var(--muted)}