:root {
  --bg: #0b0e1a;
  --panel: #131828;
  --panel-border: #262e4a;
  --board-bg: #0d1220;
  --grid-line: #1c2338;
  --accent: #7c5cff;
  --accent-2: #35e0c9;
  --text: #e9ecf7;
  --text-dim: #8891b0;
  --danger: #ff5470;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  height: 100%;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  padding: 8px;
  gap: 6px;
}

#topbar {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

#topbar h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 6px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.version {
  font-size: 11px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

#game-wrap {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  flex: 1;
  min-height: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 96px;
}

.box {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 8px;
}

.box-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-dim);
  text-align: center;
  margin-bottom: 4px;
}

#hold-canvas, #next-canvas {
  display: block;
  width: 100%;
  image-rendering: pixelated;
}

.stats {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat { display: flex; flex-direction: column; }
.stat-label { font-size: 9px; letter-spacing: 1px; color: var(--text-dim); }
.stat-value { font-size: 16px; font-weight: 700; font-variant-numeric: tabular-nums; }

.board-col {
  position: relative;
  flex: 1;
  display: flex;
  justify-content: center;
  min-height: 0;
  height: 100%;
}

#board-canvas {
  background: var(--board-bg);
  border: 2px solid var(--panel-border);
  border-radius: 10px;
  height: 100%;
  max-width: 100%;
  image-rendering: pixelated;
}

.btn {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text);
  padding: 8px 6px;
  border-radius: 8px;
  font-size: 11px;
  cursor: pointer;
  letter-spacing: 0.5px;
}
.btn:active { background: var(--accent); border-color: var(--accent); }
.btn.small { width: 100%; }

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(6, 8, 16, 0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
}
.overlay.hidden { display: none; }
.overlay-card {
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--accent);
  padding: 24px 28px;
  border-radius: 14px;
}
.overlay-card h2 { margin: 0 0 6px; letter-spacing: 2px; }
.overlay-card p { margin: 0 0 14px; color: var(--text-dim); font-size: 13px; white-space: pre-line; }
.overlay-card .btn { padding: 10px 22px; font-size: 13px; background: var(--accent); border-color: var(--accent); }

#hint {
  font-size: 11px;
  color: var(--text-dim);
  margin: 2px 0 0;
}

#touch-controls { display: none; width: 100%; max-width: 420px; }

.tc-row {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 4px 0;
}

.tc-btn {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 12px;
  font-size: 18px;
  padding: 14px 0;
  flex: 1;
  max-width: 90px;
}
.tc-btn:active { background: var(--accent); border-color: var(--accent); }
.tc-hold, .tc-rotate { font-size: 13px; letter-spacing: 1px; max-width: 130px; }
.tc-drop { font-size: 13px; letter-spacing: 1px; max-width: 320px; background: var(--danger); border-color: var(--danger); color: #fff; }
.tc-dpad { gap: 14px; }
.tc-arrow { font-size: 20px; }

/* Mobile / touch layout */
@media (max-width: 720px), (pointer: coarse) {
  #hint { display: none; }
  .panel-left .box:not(.stats) { display: none; }
  #game-wrap { flex-wrap: wrap; justify-content: center; }
  .panel { width: auto; flex-direction: row; flex-wrap: wrap; }
  .panel-left { order: 2; }
  .panel-right { order: 3; flex-direction: row; align-items: flex-start; }
  .panel-right .box { width: 70px; }
  .board-col { order: 1; height: 52vh; width: 100%; }
  #touch-controls { display: block; }
  .stats { flex-direction: row; flex-wrap: wrap; gap: 10px 16px; }
}

@media (min-width: 721px) and (pointer: fine) {
  #touch-controls { display: none !important; }
}