:root {
  --bg: #0b1220;
  --panel: #151f32;
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --warn: #fbbf24;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  padding: 1.5rem;
  max-width: 960px;
  margin-inline: auto;
}
.badge {
  display: inline-block;
  color: var(--accent);
  border: 1px solid #334155;
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.85rem;
}
h1 { margin: 0.5rem 0 0; font-size: 2rem; }
.sub { color: var(--muted); margin-top: 0.25rem; }
.links a { color: var(--accent); }
.panel {
  background: var(--panel);
  border-radius: 12px;
  padding: 1.25rem;
  margin-top: 1.25rem;
  border: 1px solid #1e293b;
}
.hint { color: var(--muted); font-size: 0.95rem; }
.buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0; }
button {
  background: #1e293b;
  color: var(--text);
  border: 1px solid #334155;
  border-radius: 8px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-weight: 600;
}
button:hover { border-color: var(--accent); }
button.active { border-color: var(--warn); color: var(--warn); }
pre {
  background: #020617;
  border-radius: 8px;
  padding: 1rem;
  overflow: auto;
  max-height: 420px;
  font-size: 0.8rem;
  border: 1px solid #1e293b;
}
code { color: var(--accent); }
footer { margin-top: 2rem; color: var(--muted); font-size: 0.85rem; }