:root {
  --bg-color: #1a1a2e;
  --grid-bg: #16213e;
  --text-color: #e94560;
  --accent-color: #0f3460;
  --tile-color: #e94560;
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  margin: 0;
  background-color: var(--bg-color);
  color: #fff;
  font-family: var(--font-family);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  overflow: hidden;
  touch-action: none; /* Prevent scroll on mobile */
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 500px;
  padding: 20px;
}

.header {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 20px;
}

.scores {
  display: flex;
  gap: 20px;
}

.score-box {
  background: var(--accent-color);
  padding: 10px 20px;
  border-radius: 8px;
  text-align: center;
}

.score-box .label {
  display: block;
  font-size: 0.8em;
  opacity: 0.7;
}

.score-box .value {
  font-size: 1.5em;
  font-weight: bold;
}

.controls {
  display: flex;
  gap: 10px;
}

.btn {
  background: var(--accent-color);
  border: none;
  color: white;
  padding: 10px 15px;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
  transition: transform 0.1s;
}

.btn:active {
  transform: scale(0.95);
}

.btn.primary {
  background: var(--tile-color);
  font-size: 1.2em;
  padding: 15px 30px;
}

#game-container {
  position: relative;
  margin-bottom: 20px;
}

canvas {
  background: var(--grid-bg);
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  z-index: 10;
}

.overlay.hidden {
  display: none;
}

.overlay-content {
  text-align: center;
  background: var(--grid-bg);
  padding: 30px;
  border-radius: 10px;
  border: 2px solid var(--tile-color);
}

.instructions {
  text-align: center;
  opacity: 0.6;
  font-size: 0.9em;
}

/* Responsive adjustments */
@media (max-width: 600px) {
  #app {
    padding: 10px;
  }

  .score-box {
    padding: 5px 10px;
  }

  .score-box .value {
    font-size: 1.2em;
  }
}