/* --- CSS Variables and Basic Reset --- */
  :root {
	--primary-color: #4caf50;
	--secondary-color: #007bff;
	--danger-color: #f44336;
	--background-color: #000033;
	--light-text: #ffffff;
	--dark-text: #333333;
	--overlay-bg: rgba(0, 0, 0, 0.85);
	--win-overlay-bg: rgba(20, 100, 20, 0.9);
  }

  body {
	margin: 0;
	overflow: hidden;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
	  "Helvetica Neue", Arial, sans-serif;
	background-color: var(--background-color);
	color: var(--light-text);
	position: fixed;
	width: 100%;
	height: 100%;
  }

  /* --- Screen Management --- */
  .screen {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	display: none;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 20px;
	box-sizing: border-box;
	background-color: var(--background-color);
	transition: opacity 0.5s ease;
	opacity: 0;
  }

  .screen.active {
	display: flex;
	opacity: 1;
  }

  /* --- Splash Screen Styling --- */
  #splash-screen {
	background: radial-gradient(
	  circle at center,
	  #6b46c1 0%,
	  #3b82f6 25%,
	  #6b46c1 50%,
	  #3b82f6 75%,
	  #6b46c1 100%
	);
	background-size: 100% 100%;
	position: relative;
	overflow: hidden;
  }

  #splash-screen::before {
	content: "";
	position: absolute;
	top: 50%;
	left: 50%;
	width: 200%;
	height: 200%;
	background: conic-gradient(
	  from 0deg,
	  #6b46c1 0deg 22.5deg,
	  #3b82f6 22.5deg 45deg,
	  #6b46c1 45deg 67.5deg,
	  #3b82f6 67.5deg 90deg,
	  #6b46c1 90deg 112.5deg,
	  #3b82f6 112.5deg 135deg,
	  #6b46c1 135deg 157.5deg,
	  #3b82f6 157.5deg 180deg,
	  #6b46c1 180deg 202.5deg,
	  #3b82f6 202.5deg 225deg,
	  #6b46c1 225deg 247.5deg,
	  #3b82f6 247.5deg 270deg,
	  #6b46c1 270deg 292.5deg,
	  #3b82f6 292.5deg 315deg,
	  #6b46c1 315deg 337.5deg,
	  #3b82f6 337.5deg 360deg
	);
	transform: translate(-50%, -50%);
	z-index: 1;
	animation: rotate 20s linear infinite;
  }

  @keyframes rotate {
	from {
	  transform: translate(-50%, -50%) rotate(0deg);
	}
	to {
	  transform: translate(-50%, -50%) rotate(360deg);
	}
  }

  /* 3D Canvas for splash screen */
  #splash-3d-container {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 2;
	pointer-events: none;
  }

  .splash-content {
	position: relative;
	z-index: 10;
	text-align: center;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	width: 100%;
	max-width: 500px;
  }

  .title-container {
	text-align: center;
	margin-bottom: 40px;
	position: relative;
	z-index: 10;
	width: 100%;
  }

  .splash-title {
	font-size: clamp(2.5rem, 10vw, 4.5rem);
	font-weight: 900;
	color: #ffffff;
	text-shadow: 4px 4px 0px #000000, -4px -4px 0px #000000,
	  4px -4px 0px #000000, -4px 4px 0px #000000,
	  6px 6px 10px rgba(0, 0, 0, 0.8);
	letter-spacing: 0.05em;
	margin: 0;
	line-height: 0.9;
  }

  .splash-subtitle {
	font-size: clamp(1rem, 4vw, 1.5rem);
	color: #ffffff;
	margin-top: 10px;
	margin-bottom: 0;
	text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
	font-weight: 600;
  }

  .menu-container {
	width: 100%;
	max-width: 380px;
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 15px;
	position: relative;
	z-index: 10;
	margin: 0 auto;
  }

  .btn {
	padding: 18px 24px;
	border-radius: 15px;
	border: 4px solid #000000;
	color: #ffffff;
	cursor: pointer;
	font-size: 1.4rem;
	font-weight: 900;
	text-transform: uppercase;
	transition: transform 0.2s ease, background-color 0.3s ease,
	  border-color 0.3s ease;
	text-shadow: 2px 2px 0px #000000;
	letter-spacing: 0.1em;
	position: relative;
	overflow: hidden;
	pointer-events: all;
	width: 100%;
	max-width: 280px;
	text-align: center;
  }

  .btn:hover {
	transform: translateY(-3px) scale(1.05);
  }

  .btn:active {
	transform: scale(0.96) translateY(0);
  }

  .btn-primary {
	background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
	border-color: #000000;
	box-shadow: 0 6px 0 #92400e, 0 8px 15px rgba(0, 0, 0, 0.3);
  }

  .btn-primary:hover {
	box-shadow: 0 8px 0 #92400e, 0 12px 20px rgba(0, 0, 0, 0.4);
  }

  .btn-secondary {
	background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
	border-color: #000000;
	box-shadow: 0 6px 0 #1e3a8a, 0 8px 15px rgba(0, 0, 0, 0.3);
  }

  .btn-secondary:hover {
	box-shadow: 0 8px 0 #1e3a8a, 0 12px 20px rgba(0, 0, 0, 0.4);
  }

  .btn-danger {
	background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
	border-color: #000000;
	box-shadow: 0 6px 0 #991b1b, 0 8px 15px rgba(0, 0, 0, 0.3);
  }

  .btn-danger:hover {
	box-shadow: 0 8px 0 #991b1b, 0 12px 20px rgba(0, 0, 0, 0.4);
  }

  /* Floating CSS Shapes (smaller and fewer to complement 3D shapes) */
  .floating-shapes {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	pointer-events: none;
	z-index: 3;
  }

  .floating-shape {
	position: absolute;
	animation: float 8s ease-in-out infinite;
	opacity: 0.6;
  }

  .floating-shape:nth-child(2n) {
	animation-direction: reverse;
	animation-duration: 10s;
  }

  .floating-shape:nth-child(3n) {
	animation-delay: -3s;
  }

  .floating-shape:nth-child(4n) {
	animation-delay: -6s;
  }

  @keyframes float {
	0%,
	100% {
	  transform: translateY(0px) rotate(0deg) scale(1);
	}
	33% {
	  transform: translateY(-30px) rotate(120deg) scale(1.1);
	}
	66% {
	  transform: translateY(15px) rotate(240deg) scale(0.9);
	}
  }

  .shape-circle {
	width: 40px;
	height: 40px;
	border-radius: 50%;
	border: 6px solid;
  }

  .shape-square {
	width: 35px;
	height: 35px;
	border: 6px solid;
	border-radius: 6px;
  }

  .shape-triangle {
	width: 0;
	height: 0;
	border-left: 20px solid transparent;
	border-right: 20px solid transparent;
	border-bottom: 35px solid;
  }

  .color-red {
	border-color: #ef4444;
  }
  .color-blue {
	border-color: #3b82f6;
  }
  .color-green {
	border-color: #10b981;
  }
  .color-yellow {
	border-color: #fbbf24;
  }
  .color-purple {
	border-color: #8b5cf6;
  }
  .color-orange {
	border-color: #f97316;
  }

  .color-red.shape-triangle {
	border-bottom-color: #ef4444;
	border-left-color: transparent;
	border-right-color: transparent;
  }
  .color-blue.shape-triangle {
	border-bottom-color: #3b82f6;
	border-left-color: transparent;
	border-right-color: transparent;
  }
  .color-green.shape-triangle {
	border-bottom-color: #10b981;
	border-left-color: transparent;
	border-right-color: transparent;
  }

  /* --- Settings Screen Specific --- */
  #settings-screen .menu-container {
	background-color: rgba(0, 0, 0, 0.8);
	padding: 30px;
	border-radius: 15px;
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
	border: 4px solid #ffffff;
  }

  .setting-item {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 15px;
  }

  .setting-item label {
	font-size: 1.1rem;
	font-weight: 600;
  }

  .setting-item select {
	padding: 10px;
	border-radius: 8px;
	border: 2px solid #000000;
	background-color: #ffffff;
	color: #000000;
	font-size: 1rem;
	font-weight: 600;
	width: 100px;
	text-align: center;
  }

  /* --- Game Screen & UI --- */
  #game-screen {
	padding: 0;
	cursor: default;
  }

  #container {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
  }

  #game-ui {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	z-index: 100;
	display: flex;
	justify-content: space-between;
	align-items: flex-start;
	padding: 20px;
	pointer-events: none;
  }

  .rotation-controls {
	display: flex;
	flex-direction: row;
	gap: 10px;
	pointer-events: all;
  }

  .rotate-btn {
	width: 50px;
	height: 50px;
	border-radius: 50%;
	background-color: rgba(0, 0, 0, 0.7);
	color: var(--light-text);
	border: 2px solid rgba(255, 255, 255, 0.3);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 1.5rem;
	font-weight: bold;
	transition: all 0.2s ease;
	text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
  }

  .rotate-btn:hover {
	transform: scale(1.1);
	background-color: rgba(0, 0, 0, 0.9);
	border-color: rgba(255, 255, 255, 0.6);
  }

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

  .rotate-btn:disabled {
	opacity: 0.5;
	cursor: not-allowed;
	transform: none;
  }

  #game-menu-btn,
  #game-score {
	pointer-events: all;
	font-size: clamp(1.2rem, 5vw, 1.8rem);
	font-weight: bold;
	color: var(--light-text);
	background-color: rgba(0, 0, 0, 0.5);
	padding: 10px 18px;
	border-radius: 12px;
	text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
	transition: transform 0.2s ease;
  }
  #game-menu-btn:hover {
	transform: scale(1.05);
  }

  #game-menu-btn {
	cursor: pointer;
  }

  /* --- Overlays (Game Over / Win) --- */
  .overlay {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%) scale(0.9);
	width: 90%;
	max-width: 400px;
	background-color: var(--overlay-bg);
	padding: 30px;
	border-radius: 20px;
	text-align: center;
	z-index: 200;
	box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
	display: none;
	opacity: 0;
	transition: transform 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28),
	  opacity 0.3s ease;
  }

  .overlay.visible {
	display: block;
	opacity: 1;
	transform: translate(-50%, -50%) scale(1);
  }

  #gameWin {
	background-color: var(--win-overlay-bg);
  }

  .overlay h2 {
	margin-top: 0;
	font-size: clamp(1.8rem, 8vw, 2.5rem);
  }

  .overlay p {
	font-size: clamp(1rem, 4vw, 1.2rem);
	margin: 20px 0;
  }

  .overlay .btn {
	margin-top: 10px;
	width: 100%;
  }