:root {
  --bg: #0b0f19;
  --card: rgba(255,255,255,.06);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.70);
  --border: rgba(255,255,255,.12);
  --link: rgba(255,255,255,.92);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 16px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 20% 0%, rgba(64,106,255,.20), transparent 60%),
              radial-gradient(900px 500px at 80% 10%, rgba(0,220,130,.14), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--link); text-decoration: underline; text-underline-offset: 3px; }
a:hover { opacity: .9; }

.container { max-width: 980px; margin: 0 auto; padding: 20px; }

.topbar {
  position: sticky; top: 0;
  background: rgba(11,15,25,.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}
.topbar__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { font-weight: 800; letter-spacing: .2px; text-decoration: none; }
.nav { display: flex; gap: 12px; }
.nav a { text-decoration: none; padding: 8px 10px; border: 1px solid transparent; border-radius: 999px; }
.nav a:hover { border-color: var(--border); background: rgba(255,255,255,.05); }

h1 { font-size: 40px; margin: 16px 0 10px; }
h2 { font-size: 22px; margin: 22px 0 10px; }
p, li { color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

label { display: block; margin-top: 10px; color: var(--muted); }
input, select, button, textarea {
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  color: var(--text);
}
input, textarea { width: 100%; }
button { cursor: pointer; }
button:hover { background: rgba(255,255,255,.08); }

pre, code {
  font-family: var(--mono);
}
pre {
  background: rgba(0,0,0,.35);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  overflow-x: auto;
  color: rgba(255,255,255,.92);
}

.footer { border-top: 1px solid var(--border); margin-top: 30px; padding: 20px 0; color: var(--muted); }

.btn { display:inline-block; padding:10px 14px; border-radius:12px; border:1px solid var(--border); background: rgba(255,255,255,.06); text-decoration:none; }
.btn:hover { background: rgba(255,255,255,.10); }