:root {
  --bg: #16161e;
  --bg-panel: #1a1b26;
  --bg-raised: #24283b;
  --border: #2f3549;
  --text: #c0caf5;
  --text-dim: #565f89;
  --accent: #7aa2f7;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header { padding: 18px 24px 10px; text-align: center; }
header h1 { font-size: 22px; letter-spacing: 0.5px; }
header p { color: var(--text-dim); font-size: 13px; margin-top: 2px; }

main { display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 8px 16px; width: 100%; }

.stage-wrap {
  position: relative;
  background: #000;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  max-width: 962px;
  width: 100%;
}
canvas { display: block; width: 100%; }

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(22, 22, 30, 0.9);
}
.overlay.hidden { display: none; }
.overlay .hint { color: var(--text-dim); font-size: 13px; }

button, select {
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 13px;
  cursor: pointer;
}
button:hover, select:hover { border-color: var(--accent); }
#btn-start { font-size: 16px; padding: 12px 22px; }

.linklike {
  background: none;
  border: none;
  color: var(--accent);
  padding: 0;
  font-size: 13px;
  text-decoration: underline;
}

.controls {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 16px;
  font-size: 13px;
}
.controls label { display: flex; align-items: center; gap: 7px; color: var(--text-dim); }
.controls input[type="range"] { accent-color: var(--accent); width: 110px; }
.controls .chk input { accent-color: var(--accent); }
#cols-val { color: var(--text); min-width: 26px; }

footer {
  margin-top: auto;
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 14px 24px;
  font-size: 12px;
  color: var(--text-dim);
}
footer a { color: var(--accent); text-decoration: none; }