* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: #10131c;
  color: #f2f2f7;
  font-family: 'Segoe UI', 'Apple SD Gothic Neo', sans-serif;
  height: 100%;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100%;
  padding: 12px;
  gap: 12px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  max-width: 520px;
}

.app-header h1 {
  font-size: 1.3rem;
  margin: 0;
  color: #ffd166;
  letter-spacing: 1px;
}

.icon-btn {
  margin-left: auto;
  background: #2a2f45;
  color: #f2f2f7;
  border: none;
  border-radius: 8px;
  width: 36px;
  height: 36px;
  font-size: 1rem;
  cursor: pointer;
}
.icon-btn:hover { background: #383e5c; }

.game-layout {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 14px;
}

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 120px;
}

.panel-box {
  background: #1b1f2b;
  border-radius: 10px;
  padding: 8px;
  text-align: center;
}

.panel-box h2 {
  font-size: 0.75rem;
  letter-spacing: 1px;
  margin: 0 0 6px;
  color: #8f95b2;
}

.panel-box canvas {
  display: block;
  width: 100%;
  border-radius: 6px;
}

.stats .stat-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 2px;
  font-size: 0.85rem;
}
.stats .stat-row span { color: #8f95b2; }
.stats .stat-row strong { color: #ffd166; }

.board-wrapper {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 0 0 4px #262b3d, 0 12px 30px rgba(0, 0, 0, 0.5);
  line-height: 0;
}

#board-canvas {
  display: block;
  width: 300px;
  height: 600px;
  max-width: 90vw;
  max-height: 80vh;
  background: #1b1f2b;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(10, 12, 20, 0.85);
  text-align: center;
  padding: 16px;
  line-height: 1.5;
}

.overlay.hidden {
  display: none;
}

.overlay h2 {
  margin: 0;
  color: #ffd166;
}

.overlay p {
  margin: 0;
  color: #c7cbe0;
  font-size: 0.9rem;
  max-width: 240px;
}

.primary-btn {
  background: #ff6b6b;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.2s ease;
}
.primary-btn:hover { background: #ff8787; }
.primary-btn:active { transform: scale(0.96); }

.touch-controls {
  display: none;
  width: 100%;
  max-width: 520px;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.touch-group {
  display: flex;
  gap: 10px;
}

.touch-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: #2a2f45;
  color: #f2f2f7;
  font-size: 1.2rem;
  cursor: pointer;
  user-select: none;
  touch-action: none;
}
.touch-btn:active { background: #ff6b6b; }
.touch-btn.small {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  font-size: 0.7rem;
  font-weight: 700;
}

@media (max-width: 640px), (pointer: coarse) {
  .side-panel--left .stats { order: 2; }
  .game-layout {
    flex-wrap: wrap;
  }
  .side-panel {
    width: 90px;
  }
  .touch-controls {
    display: flex;
  }
}

@media (max-width: 420px) {
  .side-panel--right { display: none; }
  .side-panel--left { width: 100px; }
}