:root {
  color-scheme: dark;
  --bg: #0b0b0b;
  --fg: #ddd;
  --accent: #33d1ff;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg); color: var(--fg); font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial; }
#toolbar { display: none !important; }
#toolbar label, #toolbar button { font-size: 14px; }
#toolbar input[type="range"] { vertical-align: middle; width: 160px; margin-left: 6px; }
.btn {
  padding: 6px 10px; border: 1px solid rgba(255,255,255,.15);
  border-radius: 6px; cursor: pointer; user-select: none;
}
#stage { height: 100vh; display: grid; place-items: center; padding: 0; }
canvas { max-width: 100%; height: auto !important; outline: none; }
button { background: rgba(255,255,255,.06); color: var(--fg); border: 1px solid rgba(255,255,255,.15); padding: 6px 10px; border-radius: 6px; cursor: pointer; }
button:hover { border-color: var(--accent); }