:root {
  color-scheme: dark;
  --bg: #0e1620;
  --panel: #16222e;
  --line: #22303e;
  --text: #e8eef5;
  --muted: #8fa3b8;
  --accent: #3ec6ff;
  --warm: #f0a030;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
}

.app {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100dvh;
  max-width: 1200px;
  margin: 0 auto;
  padding: max(8px, env(safe-area-inset-top)) 12px max(8px, env(safe-area-inset-bottom));
}

.hud { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.hud div {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 8px;
  border-radius: 8px;
  background: var(--panel);
}
.hud span { font-size: 0.7rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.hud strong { font-size: 1.1rem; font-variant-numeric: tabular-nums; }

.stage { position: relative; flex: 1; min-height: 0; }
#board { display: block; width: 100%; height: 100%; touch-action: none; }

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  background: rgba(8, 12, 18, 0.72);
}
.card {
  width: min(420px, 100%);
  max-height: 100%;
  overflow: auto;
  padding: 20px;
  border-radius: 12px;
  background: var(--panel);
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}
.card h1 { margin: 0 0 8px; color: var(--warm); }
.card p { margin: 4px 0; }
.account-note, .muted { color: var(--muted); }

button, .button {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 16px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #04121c;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.button.secondary { margin-right: 8px; border: 1px solid var(--accent); background: transparent; color: var(--accent); }
button:disabled { opacity: 0.4; cursor: default; }

.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.controls button { margin-top: 0; }
.version { margin-left: auto; font-size: 0.75rem; color: var(--muted); }

.leaderboard { margin-top: 16px; text-align: left; }
.leaderboard h2 { margin: 0 0 6px; font-size: 1rem; color: var(--muted); }
.leaderboard ol { margin: 0; padding: 0; list-style: none; }
.leaderboard li {
  display: grid;
  grid-template-columns: 3em 1fr auto;
  gap: 8px;
  padding: 3px 0;
  border-bottom: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}
.leaderboard .me { margin-top: 8px; color: var(--warm); }

@media (max-width: 520px) {
  .hud span { font-size: 0.6rem; }
  .hud strong { font-size: 0.95rem; }
}