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

body {
  background: #0a0a2e;
  color: #fff;
  font-family: 'Segoe UI', system-ui, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  overflow: hidden;
}

.game-wrapper {
  text-align: center;
  position: relative;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 16px;
  text-shadow: 0 0 20px #7b2ff7;
  letter-spacing: 2px;
}

.game-area {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: flex-start;
}

canvas#board {
  border: 3px solid #7b2ff7;
  border-radius: 4px;
  box-shadow: 0 0 30px rgba(123, 47, 247, .4), inset 0 0 20px rgba(0,0,0,.5);
  background: #111133;
}

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 140px;
}

.info-box {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(123, 47, 247, .3);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-box .label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: .6;
}

.info-box .value {
  font-size: 1.6rem;
  font-weight: 700;
  color: #b388ff;
}

canvas#next-piece {
  background: #111133;
  border: 2px solid #555;
  border-radius: 4px;
  margin-top: 4px;
}

.controls-box {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  padding: 10px;
}

.controls-box .label {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: .5;
  display: block;
  margin-bottom: 6px;
}

.key-hint {
  font-size: .75rem;
  opacity: .55;
  margin: 3px 0;
  white-space: nowrap;
}

.buttons {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  justify-content: center;
}

button {
  padding: 10px 28px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: linear-gradient(135deg, #7b2ff7, #5128a8);
  color: #fff;
  transition: .2s;
  letter-spacing: 1px;
}

button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(123, 47, 247, .5);
}

button:disabled {
  opacity: .35;
  cursor: not-allowed;
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(5, 5, 30, .85);
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 12px;
  z-index: 10;
  backdrop-filter: blur(4px);
  opacity: 1;
  transition: opacity .3s;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.overlay-content h2 {
  font-size: 2.4rem;
  margin-bottom: 8px;
  color: #b388ff;
}

.overlay-content p {
  opacity: .7;
  font-size: 1rem;
  margin-bottom: 20px;
}

.overlay-start-btn {
  padding: 14px 40px;
  font-size: 1.2rem;
  font-weight: 700;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: linear-gradient(135deg, #7b2ff7, #c850ff);
  color: #fff;
  letter-spacing: 1px;
  transition: .25s;
  animation: pulse 2s ease-in-out infinite;
}

.overlay-start-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 0 30px rgba(123, 47, 247, .7);
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 10px rgba(123, 47, 247, .4); }
  50% { box-shadow: 0 0 30px rgba(200, 80, 255, .7); }
}