* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #000;
  color: #fff;
  overflow: hidden;
  flex-direction: column;
  padding: 10px;
}

/* Base Fullscreen Overlays */
#gameOverScreen, #colorSelectionOverlay, #levelOverlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10;
  padding: 20px;
  box-sizing: border-box;
}

#gameOverScreen {
  background: black;
  color: red;
  font-size: clamp(30px, 8vw, 60px);
  text-align: center;
  z-index: 9999;
  animation: flicker 1s infinite;
}

@keyframes flicker {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

#introImage {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain; 
  background-color: #000; 
  z-index: 1000;
}

/* Color Selection Screen */
#colorSelectionOverlay {
  background: #222;
  z-index: 15;
}

#colorSelectionOverlay h1, #levelOverlay h1 {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  margin-bottom: 25px;
  color: gold;
  text-align: center;
}

.color-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(10px, 3vw, 20px);
  padding: 20px;
  background: #333;
  border-radius: 10px;
  max-width: 90vw;
}

.color-box {
  width: clamp(70px, 20vw, 100px);
  height: clamp(60px, 15vw, 80px);
  border: 3px solid white;
  cursor: pointer;
  transition: transform 0.2s;
}

.color-box:hover {
  transform: scale(1.05);
  border-color: gold;
}

/* Level Overlay */
#levelOverlay {
  background: rgba(0, 0, 0, 0.95);
}

#backToColors {
  position: absolute;
  top: 20px;
  left: 20px;
  background: #444;
  color: white;
  border: 1px solid gold;
  padding: 8px 15px;
  cursor: pointer;
  border-radius: 5px;
  font-size: 14px;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 90vw;
}

@media (min-width: 480px) {
  .level-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

.level {
  width: clamp(65px, 18vw, 80px);
  height: clamp(65px, 18vw, 80px);
  background: orange;
  border-radius: 15px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 22px;
  font-weight: bold;
  cursor: pointer;
  position: relative;
}

.stars {
  position: absolute;
  top: -15px;
  font-size: 12px;
  color: gold;
}

/* Game Playing Interface */
#gameUI {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

#topbar {
  margin-bottom: 5px;
  font-size: clamp(16px, 4vw, 22px);
  display: flex;
  gap: 30px;
}

/* Dynamic Responsive Canvas */
canvas {
  border: 2px solid brown;
  background: radial-gradient(circle at center, #111 20%, #330000 100%);
  max-width: 100%;
  max-height: 60vh;
  object-fit: contain;
}

/* Input Controller Rows */
#controls {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.control-row {
  display: flex;
  gap: 15px;
}

.btn {
  width: clamp(50px, 14vw, 65px);
  height: clamp(50px, 14vw, 65px);
  border-radius: 50%; /* Rounded controls are easier to tap on mobile */
  background: orange;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 22px;
  color: #000;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
}

/* Desktop optimization to hide layout controllers if wanted, or leave visible for mouse */
@media (min-width: 768px) {
  #controls {
    margin-top: 15px;
  }
}