:root {
  --pb-bg: #0d1117;
  --pb-card: #161b22;
  --pb-border: #2a2f3a;
  --pb-text: #e6edf3;
  --pb-muted: #8b949e;
  --pb-accent: #7ee787;
}
html, body { background: var(--pb-bg); color: var(--pb-text); }
body { min-height: 100vh; }
main.container { padding-top: 1rem; padding-bottom: 3rem; }
article, nav, dialog { background: var(--pb-card); border-color: var(--pb-border); }
.muted { color: var(--pb-muted); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.stack { display: grid; gap: 1rem; }
.hidden { display: none !important; }