:root {
  --primary-color: #FDCB6E;
  --secondary-color: #FFEAA7;
  --accent-color: #0984E3;
  --background-color: #1A150A;
  --surface-color: #2D3436;
  --text-color: #FFFFFF;
  --text-secondary: #B2BEC3;
  --success-color: #00B894;
  --error-color: #D63031;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --border-radius: 12px;
  --transition-speed: 0.3s;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent; /* Remove tap highlight on mobile */
}

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden; /* Prevent scrolling on game screen */
}

#app {
  width: 100%;
  max-width: 600px;
  height: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Screens */
.screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease;
  z-index: 1;
}

.screen.active {
  opacity: 1;
  pointer-events: auto;
  z-index: 10;
}

/* Typography */
h1.title {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  text-align: center;
  text-shadow: 0 4px 12px rgba(253, 203, 110, 0.2);
}

.subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

h2.title {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
}

/* Buttons */
.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  width: 100%;
  max-width: 300px;
}

button {
  border: none;
  border-radius: var(--border-radius);
  padding: 16px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

button:active {
  transform: scale(0.98);
}

.btn.primary {
  background: linear-gradient(135deg, var(--primary-color), #E1B12C);
  color: var(--background-color);
  box-shadow: 0 4px 12px rgba(253, 203, 110, 0.3);
}

.btn.primary:hover {
  box-shadow: 0 6px 16px rgba(253, 203, 110, 0.4);
}

.btn.secondary {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-color);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn.secondary:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

.btn.accent {
  background-color: var(--accent-color);
  color: #fff;
  box-shadow: 0 4px 12px rgba(9, 132, 227, 0.3);
}

.btn-small {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  padding: 8px 16px;
  font-size: 0.9rem;
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-secondary);
  backdrop-filter: blur(4px);
}

/* Game Area */
#game-area {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
  position: absolute;
  top: 0;
  left: 0;
}

#game-area.waiting {
  background-color: var(--background-color);
}

#game-area.ready {
  background-color: var(--error-color); /* Red - Don't click yet */
}

#game-area.go {
  background-color: var(--success-color); /* Green - Click now! */
}

#game-area.too-early {
  background-color: var(--accent-color); /* Blue - Too early */
}

.instructions {
  pointer-events: none; /* Let clicks pass through to game area */
  user-select: none;
  padding: var(--spacing-lg);
  z-index: 5;
}

#game-instruction-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: #fff;
}

#game-instruction-text {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.8);
}

.stimulus-icon {
  font-size: 5rem;
  margin-bottom: var(--spacing-lg);
  display: none;
}

/* Results Screen */
.result-card {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  width: 100%;
  max-width: 400px;
  margin-bottom: var(--spacing-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-group {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-group:last-child {
  border-bottom: none;
}

.stat-group .label {
  color: var(--text-secondary);
}

.stat-group .value {
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--primary-color);
}

.result-message {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.action-buttons {
  display: flex;
  gap: var(--spacing-md);
  width: 100%;
  max-width: 400px;
}

.action-buttons button {
  flex: 1;
}

/* High Scores */
.tabs {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.tab-btn {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-bottom: 2px solid transparent;
  border-radius: 0;
}

.tab-btn.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.scores-container {
  width: 100%;
  max-width: 500px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius);
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
  max-height: 400px;
  overflow-y: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: var(--spacing-md);
  text-align: left;
}

th {
  background: rgba(0, 0, 0, 0.2);
  font-weight: 600;
  color: var(--text-secondary);
}

td {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

tr:last-child td {
  border-bottom: none;
}

.hidden {
  display: none !important;
}

/* Particles Canvas */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 100;
}

/* Animations */
@keyframes shake {
  0% { transform: translate(1px, 1px) rotate(0deg); }
  10% { transform: translate(-1px, -2px) rotate(-1deg); }
  20% { transform: translate(-3px, 0px) rotate(1deg); }
  30% { transform: translate(3px, 2px) rotate(0deg); }
  40% { transform: translate(1px, -1px) rotate(1deg); }
  50% { transform: translate(-1px, 2px) rotate(-1deg); }
  60% { transform: translate(-3px, 1px) rotate(0deg); }
  70% { transform: translate(3px, 1px) rotate(-1deg); }
  80% { transform: translate(-1px, -1px) rotate(1deg); }
  90% { transform: translate(1px, 2px) rotate(0deg); }
  100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.shake {
  animation: shake 0.5s;
}

/* Media Queries */
@media (max-width: 600px) {
  h1.title {
    font-size: 2.5rem;
  }

  .menu-buttons {
    width: 90%;
  }

  .screen {
      padding: var(--spacing-md);
  }
}