:root{
  --bg:#0d1117;--card:#0f1420;--line:#1f2937;--fg:#e7ecf3;--muted:#9aa4b2;
  --brand:#4895ef;--brand2:#4cc9f0;--focus:#94d2ff;
}
*{box-sizing:border-box}html,body{margin:0}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--fg)}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:16px}
button,.btn{display:inline-flex;gap:8px;align-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#00101a;font-weight:800;padding:10px 14px;border-radius:12px;border:none;cursor:pointer}
.btn.secondary{background:transparent;color:var(--fg);border:1px solid var(--line)}
.btn:focus{outline:2px solid var(--focus);outline-offset:2px}
header.nav{border-bottom:1px solid var(--line);background:rgba(13,17,23,.7);backdrop-filter:saturate(1.2) blur(6px)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;gap:10px;align-items:center;font-weight:900}
.brand .dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2))}
nav ul{list-style:none;padding:0;margin:0;display:flex;gap:14px}
nav a{padding:8px 10px;border-radius:10px;color:var(--muted)}
nav a.active,nav a:hover{background:var(--card);border:1px solid var(--line);color:var(--fg)}
main{padding:24px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px}
footer{border-top:1px solid var(--line);color:var(--muted)}
@media (max-width:780px){
  .nav-links{display:none}
  .nav-toggle{display:inline-flex}
  .nav-open .nav-links{display:flex;flex-direction:column;gap:8px;margin-top:12px}
}
.nav-toggle{display:none;background:transparent;border:1px solid var(--line);border-radius:10px;color:var(--fg);padding:8px}