/* Reset and standard styling */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  background-color: #05050f; /* Very dark blue/black background */
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

/* Game Viewport Container: Centered, responsive 9:16 aspect ratio up to 540x960 */
#game-container {
  position: relative;
  aspect-ratio: 9 / 16;
  width: min(540px, 100vw, calc(100vh * 9 / 16));
  width: min(540px, 100vw, calc(100dvh * 9 / 16));
  height: min(960px, 100vh, calc(100vw * 16 / 9));
  height: min(960px, 100dvh, calc(100vw * 16 / 9));
  background-color: #000000;
  border: 3px solid #00f2fe;
  border-radius: 8px;
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.4), inset 0 0 25px rgba(0, 242, 254, 0.1);
  overflow: hidden;
  touch-action: none;
  container-type: size;
}

/* Game Canvas: scales to fit the container */
#game-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

/* HUD Overlay: top overlay, elements spread out */
#hud-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: 16px 20px;
  padding-top: max(16px, env(safe-area-inset-top));
  padding-left: max(20px, env(safe-area-inset-left));
  padding-right: max(20px, env(safe-area-inset-right));
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #00f2fe;
  font-family: 'Courier New', Courier, monospace;
  font-weight: bold;
  font-size: clamp(12px, 3.7vw, 20px);
  font-size: clamp(12px, 3.7cqw, 20px);
  text-shadow: 0 0 8px rgba(0, 242, 254, 0.8);
  pointer-events: none; /* Let all click/touch interactions pass through to the canvas */
  z-index: 10;
}

#hud-overlay span {
  font-variant-numeric: tabular-nums;
}

/* Heart symbols in lives overlay */
#lives {
  color: #ff007f;
  text-shadow: 0 0 8px rgba(255, 0, 127, 0.8);
}

/* Game Over Overlay: overlays the screen and has neon pink styles */
#game-over-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(5, 5, 15, 0.9);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: #ff007f;
  font-family: 'Courier New', Courier, monospace;
  z-index: 20;
  padding: clamp(8px, 5vw, 30px);
  padding: clamp(8px, 5cqw, 30px);
  text-align: center;
}

#game-over-overlay h1 {
  font-size: clamp(16px, 8vw, 40px);
  font-size: clamp(16px, 8cqw, 40px);
  margin-bottom: clamp(6px, 4vh, 24px);
  margin-bottom: clamp(6px, 4cqh, 24px);
  letter-spacing: clamp(2px, 1vw, 4px);
  letter-spacing: clamp(2px, 1cqw, 4px);
  text-shadow: 0 0 15px rgba(255, 0, 127, 0.9);
}

#game-over-overlay p {
  font-size: clamp(11px, 3.5vw, 18px);
  font-size: clamp(11px, 3.5cqw, 18px);
  margin: clamp(2px, 1.5vh, 8px) 0;
  margin: clamp(2px, 1.5cqh, 8px) 0;
  color: #ffffff;
  text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

#game-over-overlay span {
  font-weight: bold;
  color: #00f2fe;
  text-shadow: 0 0 8px rgba(0, 242, 254, 0.8);
}

/* Restart Button: Neon cyan interactive controls */
#restart-button {
  margin-top: clamp(8px, 5vh, 32px);
  margin-top: clamp(8px, 5cqh, 32px);
  padding: clamp(4px, 2.5vh, 12px) clamp(10px, 6vw, 36px);
  padding: clamp(4px, 2.5cqh, 12px) clamp(10px, 6cqw, 36px);
  font-size: clamp(11px, 3.5vw, 18px);
  font-size: clamp(11px, 3.5cqw, 18px);
  font-family: 'Courier New', Courier, monospace;
  font-weight: bold;
  text-transform: uppercase;
  color: #00f2fe;
  background-color: transparent;
  border: 2px solid #00f2fe;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
  text-shadow: 0 0 5px rgba(0, 242, 254, 0.5);
  pointer-events: auto; /* Re-enable pointer events for interaction */
  transition: all 0.2s ease-in-out;
}

#restart-button:hover {
  background-color: #00f2fe;
  color: #000000;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.9);
  text-shadow: none;
}

#restart-button:active {
  transform: scale(0.98);
}

/* Utility classes */
.hidden {
  display: none !important;
}