:root {
  color-scheme: dark;
  --bg: #0f1720;
  --panel: #16212e;
  --ink: #e6edf3;
  --accent: #4fd1c5;
}

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

html,
body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  overflow: hidden;
}

header {
  padding: 1rem 1.25rem 0.25rem;
}

h1 {
  font-size: 1.5rem;
  letter-spacing: 0.02em;
}

.hint {
  font-size: 0.85rem;
  opacity: 0.6;
}

main {
  flex: 1;
  padding: 1rem 1.25rem;
  min-height: 0;
}

#stage {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 14px;
  background: radial-gradient(120% 120% at 50% 0%, #1c2a3a 0%, #0c131b 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  touch-action: none; /* let pointer events drive the drag, not scroll/zoom */
  cursor: grab;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 1.25rem 1rem;
}

.stat {
  font-variant-numeric: tabular-nums;
  opacity: 0.75;
}

.stat b {
  color: var(--accent);
  font-size: 1.1rem;
}

button {
  font: inherit;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 0.45rem 1rem;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}