*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:#0b1220;color:#e8eefc}a{color:inherit;text-decoration:none}.topbar{position:sticky;top:0;display:flex;align-items:center;justify-content:space-between;padding:14px 18px;background:#ffffff0f;border-bottom:1px solid rgba(255,255,255,.1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.brand{font-weight:800;letter-spacing:.3px;cursor:pointer}.nav{display:flex;gap:14px}.nav a{opacity:.75}.nav a.active{opacity:1;font-weight:700}.container{max-width:980px;margin:0 auto;padding:18px}