:root {
  --bg: #0b0f14;
  --panel: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #1f2937;
}

* { box-sizing: border-box; }
html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
}

.topbar {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: rgba(17, 24, 39, 0.7);
  backdrop-filter: blur(8px);
}

.brand {
  font-weight: 700;
  letter-spacing: 0.3px;
}

.controls {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

label {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
}

input[type="range"] {
  width: 160px;
}

button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 10px;
  cursor: pointer;
}

button:hover { border-color: #334155; }

.stage {
  height: calc(100% - 56px);
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.metrics {
  display: flex;
  gap: 14px;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.metrics b {
  color: var(--text);
  font-weight: 700;
}

.metrics .hint {
  opacity: 0.7;
}

label.check {
  gap: 6px;
}