/* CSS Variables for Themes */
:root {
  /* Neon Theme (Default) */
  --primary-color: #00ff41;
  --secondary-color: #0080ff;
  --accent-color: #ff0080;
  --background-color: #0a0a0a;
  --surface-color: #1a1a1a;
  --text-color: #ffffff;
  --text-secondary: #cccccc;
  --border-color: #333333;
  --shadow-color: rgba(0, 255, 65, 0.3);
  --glow-color: rgba(0, 255, 65, 0.6);
  --danger-color: #ff4444;
  --warning-color: #ffaa00;
  --success-color: #44ff44;
}

[data-theme="retro"] {
  --primary-color: #ffff00;
  --secondary-color: #ff8800;
  --accent-color: #ff0088;
  --background-color: #2a1810;
  --surface-color: #3a2820;
  --text-color: #ffeeaa;
  --text-secondary: #ddcc88;
  --border-color: #664422;
  --shadow-color: rgba(255, 255, 0, 0.3);
  --glow-color: rgba(255, 255, 0, 0.6);
  --danger-color: #ff6644;
  --warning-color: #ffcc44;
  --success-color: #88ff44;
}

[data-theme="nature"] {
  --primary-color: #44ff44;
  --secondary-color: #00aa88;
  --accent-color: #ff6644;
  --background-color: #0f1f0f;
  --surface-color: #1f2f1f;
  --text-color: #eeffee;
  --text-secondary: #ccddcc;
  --border-color: #446644;
  --shadow-color: rgba(68, 255, 68, 0.3);
  --glow-color: rgba(68, 255, 68, 0.6);
  --danger-color: #ff4444;
  --warning-color: #ffaa44;
  --success-color: #44ff88;
}

[data-theme="space"] {
  --primary-color: #8844ff;
  --secondary-color: #4488ff;
  --accent-color: #ff4488;
  --background-color: #0a0a1a;
  --surface-color: #1a1a2a;
  --text-color: #eeeeff;
  --text-secondary: #ccccdd;
  --border-color: #444466;
  --shadow-color: rgba(136, 68, 255, 0.3);
  --glow-color: rgba(136, 68, 255, 0.6);
  --danger-color: #ff4466;
  --warning-color: #ffaa66;
  --success-color: #66ff88;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body, html {
  font-family: 'Rajdhani', sans-serif;
  background: var(--background-color);
  color: var(--text-color);
  overflow-x: hidden;
  overflow-y: auto;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  /* iOS PWA support */
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

/* iOS PWA - handle safe areas */
@supports (padding: max(0px)) {
  body {
    padding-left: max(0px, env(safe-area-inset-left));
    padding-right: max(0px, env(safe-area-inset-right));
  }
}

/* Particle Background */
#particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: radial-gradient(circle at 20% 50%, rgba(0, 255, 65, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(0, 128, 255, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 40% 80%, rgba(255, 0, 128, 0.1) 0%, transparent 50%);
  animation: particleFloat 20s ease-in-out infinite;
}

@keyframes particleFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  33% { transform: translateY(-20px) rotate(120deg); }
  66% { transform: translateY(10px) rotate(240deg); }
}

/* Screen Management */
.screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 10;
}

.screen.active {
  opacity: 1;
  visibility: visible;
}

.screen.overlay {
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  z-index: 100;
}

/* Main Menu */
.menu-container {
  max-width: 1200px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2rem 1rem;
  text-align: center;
  -webkit-overflow-scrolling: touch;
}

.logo h1 {
  font-family: 'Orbitron', monospace;
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 900;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color), var(--accent-color));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 3s ease-in-out infinite;
  text-shadow: 0 0 30px var(--glow-color);
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.subtitle {
  font-size: clamp(0.9rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  opacity: 0.8;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.menu-section {
  margin-bottom: 2rem;
}

.menu-section h3 {
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-weight: 600;
}

/* Game Mode Grid */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.mode-btn {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem 1rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.mode-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.mode-btn:hover::before {
  left: 100%;
}

.mode-btn:hover {
  border-color: var(--primary-color);
  box-shadow: 0 10px 30px var(--shadow-color);
  transform: translateY(-5px);
}

.mode-btn:active {
  transform: translateY(-2px);
}

.mode-icon {
  font-size: clamp(2.2rem, 5vw, 3rem);
  margin-bottom: 0.75rem;
}

.mode-name {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.4rem;
}

.mode-desc {
  font-size: clamp(0.85rem, 2vw, 1rem);
  color: var(--text-secondary);
  opacity: 0.8;
  line-height: 1.3;
}

/* Settings Grid */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.setting-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.setting-item label {
  font-weight: 600;
  color: var(--text-color);
}

.setting-item select {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem 1rem;
  color: var(--text-color);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.setting-item select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 10px var(--shadow-color);
}

.setting-item input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--primary-color);
  cursor: pointer;
}

/* Menu Buttons */
.menu-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.menu-btn {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 1rem 2rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.menu-btn.primary {
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  color: var(--background-color);
  border-color: var(--primary-color);
}

.menu-btn.secondary {
  background: var(--surface-color);
  border-color: var(--border-color);
}

.menu-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px var(--shadow-color);
}

.menu-btn.primary:hover {
  box-shadow: 0 10px 25px var(--glow-color);
}

.menu-btn:active {
  transform: translateY(-1px);
}

/* Game Screen */
#gameScreen {
  flex-direction: column;
  padding: 1rem;
  gap: 1rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  align-items: center;
  justify-content: flex-start;
}

/* Game HUD */
#gameHUD {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1200px;
  padding: 1rem 2rem;
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 15px;
  backdrop-filter: blur(10px);
}

.hud-left, .hud-right {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.hud-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-color);
  font-family: 'Orbitron', monospace;
}

.mode-indicator {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent-color);
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  border: 1px solid var(--accent-color);
}

.timer {
  font-family: 'Orbitron', monospace;
  font-size: 1.1rem;
  color: var(--text-color);
}

.power-ups {
  display: flex;
  gap: 0.5rem;
}

.power-up-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: var(--surface-color);
  border: 2px solid var(--primary-color);
  animation: powerUpPulse 2s ease-in-out infinite;
}

@keyframes powerUpPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 10px var(--shadow-color); }
  50% { transform: scale(1.1); box-shadow: 0 0 20px var(--glow-color); }
}

.hud-btn {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.2rem;
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hud-btn:hover {
  border-color: var(--primary-color);
  box-shadow: 0 0 15px var(--shadow-color);
  transform: scale(1.1);
}

/* Game Container */
#gameContainer {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

#gameCanvas {
  border: 3px solid var(--primary-color);
  border-radius: 15px;
  box-shadow: 0 0 30px var(--shadow-color);
  background: var(--surface-color);
  max-width: 90vw;
  max-height: 60vh;
}

#gameEffects {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}

/* Touch Controls */
#touchControls {
  display: none; /* Hidden on desktop by default */
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* Keyboard instructions for desktop */
#keyboardInstructions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1rem;
  color: var(--text-secondary);
  font-size: 1rem;
}

#keyboardInstructions kbd {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 5px;
  padding: 0.4rem 0.8rem;
  font-family: 'Orbitron', monospace;
  font-size: 0.9rem;
  color: var(--primary-color);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.control-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.control-btn {
  width: 60px;
  height: 60px;
  border: 2px solid var(--border-color);
  border-radius: 15px;
  background: var(--surface-color);
  color: var(--text-color);
  font-size: 1.5rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

.control-btn:hover {
  border-color: var(--primary-color);
  box-shadow: 0 0 15px var(--shadow-color);
}

.control-btn:active {
  background: var(--primary-color);
  color: var(--background-color);
  transform: scale(0.95);
}

.control-btn.special {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: var(--background-color);
}

/* Pause Screen */
.pause-container {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
  max-width: 500px;
  width: 90%;
}

.pause-container h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 2rem;
  font-family: 'Orbitron', monospace;
}

.pause-stats {
  display: flex;
  justify-content: space-around;
  margin-bottom: 2rem;
}

.pause-stat {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.pause-stat span:first-child {
  color: var(--text-secondary);
  font-size: 1rem;
}

.pause-stat span:last-child {
  color: var(--primary-color);
  font-size: 1.5rem;
  font-weight: 700;
  font-family: 'Orbitron', monospace;
}

.pause-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Game Over Screen */
.gameover-container {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
  max-width: 600px;
  width: 90%;
}

.gameover-container h2 {
  font-size: 3rem;
  color: var(--danger-color);
  margin-bottom: 2rem;
  font-family: 'Orbitron', monospace;
  text-shadow: 0 0 20px var(--danger-color);
}

.final-stats {
  display: flex;
  justify-content: space-around;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.stat-circle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 120px;
  height: 120px;
  border: 3px solid var(--primary-color);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  position: relative;
}

.stat-circle::before {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border-radius: 50%;
  background: conic-gradient(var(--primary-color), var(--secondary-color), var(--accent-color), var(--primary-color));
  z-index: -1;
  animation: rotate 3s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--primary-color);
  font-family: 'Orbitron', monospace;
}

.stat-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.new-record {
  background: linear-gradient(45deg, var(--success-color), var(--warning-color));
  color: var(--background-color);
  padding: 1rem 2rem;
  border-radius: 25px;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  animation: recordCelebration 2s ease-in-out infinite;
}

@keyframes recordCelebration {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.new-record.hidden {
  display: none;
}

.gameover-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Leaderboard Screen */
.leaderboard-container, .achievements-container, .help-container {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem;
  max-width: 800px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

.leaderboard-container h2, .achievements-container h2, .help-container h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 2rem;
  text-align: center;
  font-family: 'Orbitron', monospace;
}

.leaderboard-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.tab-btn {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 0.75rem 1.5rem;
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.3s ease;
}

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

.leaderboard-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.leaderboard-entry {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  border-left: 4px solid var(--primary-color);
}

.leaderboard-rank {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  min-width: 50px;
}

.leaderboard-info {
  flex: 1;
  margin-left: 1rem;
}

.leaderboard-name {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-color);
}

.leaderboard-mode {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.leaderboard-score {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-color);
  font-family: 'Orbitron', monospace;
}

/* Achievements */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.achievement-item {
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--border-color);
  border-radius: 15px;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.3s ease;
}

.achievement-item.unlocked {
  border-color: var(--success-color);
  box-shadow: 0 0 15px rgba(68, 255, 68, 0.3);
}

.achievement-item.locked {
  opacity: 0.5;
  filter: grayscale(100%);
}

.achievement-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.achievement-name {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

.achievement-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.achievement-progress {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.achievement-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transition: width 0.3s ease;
}

/* Help Screen */
.help-content {
  text-align: left;
}

.help-section {
  margin-bottom: 2rem;
}

.help-section h3 {
  font-size: 1.5rem;
  color: var(--secondary-color);
  margin-bottom: 1rem;
  font-weight: 600;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.control-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
}

.control-item kbd {
  background: var(--surface-color);
  border: 2px solid var(--border-color);
  border-radius: 5px;
  padding: 0.25rem 0.5rem;
  font-family: 'Orbitron', monospace;
  font-size: 0.9rem;
  color: var(--primary-color);
}

.modes-help, .powerups-help {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mode-help, .powerup-help {
  padding: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  border-left: 4px solid var(--primary-color);
}

/* Achievement Notification */
.achievement-popup {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background: var(--surface-color);
  border: 2px solid var(--success-color);
  border-radius: 15px;
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  transform: translateX(400px);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.achievement-popup:not(.hidden) {
  transform: translateX(0);
}

.achievement-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.achievement-icon {
  font-size: 2rem;
}

.achievement-title {
  font-size: 1rem;
  color: var(--success-color);
  font-weight: 600;
}

.achievement-name {
  font-size: 1.2rem;
  color: var(--text-color);
  font-weight: 700;
}

/* Loading Screen */
.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.loading-snake {
  display: flex;
  gap: 0.5rem;
}

.snake-segment {
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border-radius: 4px;
  animation: snakeMove 1.5s ease-in-out infinite;
}

.snake-segment:nth-child(2) { animation-delay: 0.1s; }
.snake-segment:nth-child(3) { animation-delay: 0.2s; }
.snake-segment:nth-child(4) { animation-delay: 0.3s; }

@keyframes snakeMove {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.loading-text {
  font-size: 1.5rem;
  color: var(--text-color);
  font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
  body {
    font-size: 16px;
  }

  .menu-container {
    padding: 1.5rem 0.75rem;
    width: 95%;
  }

  .logo h1 {
    font-size: clamp(2rem, 8vw, 3rem);
    margin-bottom: 0.5rem;
  }

  .subtitle {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  .menu-section {
    margin-bottom: 1.5rem;
  }

  .menu-section h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
  }

  .mode-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .mode-btn {
    padding: 1rem 0.75rem;
    min-height: 120px;
  }

  .settings-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .menu-buttons {
    gap: 0.75rem;
  }

  .menu-btn {
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
  }

  #gameScreen {
    padding: 0.25rem;
    gap: 0.25rem;
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
  }

  #gameHUD {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.4rem 0.5rem;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
  }

  .hud-left, .hud-right {
    display: flex;
    gap: 0.75rem;
    align-items: center;
  }

  .hud-center {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-direction: row;
  }

  .stat-item {
    gap: 0.1rem;
  }

  .stat-label {
    font-size: 0.65rem;
  }

  .stat-value {
    font-size: 0.95rem;
  }

  .mode-indicator {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
  }

  .timer {
    font-size: 0.8rem;
  }

  .hud-btn {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  #gameContainer {
    flex-shrink: 1;
    flex-grow: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }

  /* Better mobile canvas sizing */
  #gameCanvas {
    max-width: 95vw;
    width: 95vw;
    height: auto;
    aspect-ratio: 1;
    max-height: calc(100vh - 320px);
    max-height: calc(100dvh - 320px);
    border-width: 2px;
  }

  /* Improved touch controls for mobile */
  #touchControls {
    display: flex; /* Show on mobile */
    margin: 0;
    padding: 0.25rem;
    gap: 0.3rem;
    flex-shrink: 0;
  }

  /* Hide keyboard instructions on mobile */
  #keyboardInstructions {
    display: none;
  }

  .control-row {
    gap: 0.3rem;
  }

  .control-btn {
    width: 70px;
    height: 70px;
    font-size: 1.6rem;
    border-radius: 12px;
    border-width: 3px;
  }

  .control-btn:active {
    transform: scale(0.92);
  }

  .power-up-icon {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }

  .final-stats {
    flex-direction: row;
    justify-content: space-around;
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .stat-circle {
    width: 100px;
    height: 100px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .stat-text {
    font-size: 0.8rem;
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }

  .achievement-popup {
    top: 1rem;
    right: 1rem;
    left: 1rem;
    transform: translateY(-200px);
    padding: 1rem;
  }

  .achievement-popup:not(.hidden) {
    transform: translateY(0);
  }

  .pause-container, .gameover-container {
    padding: 2rem 1.5rem;
  }

  .leaderboard-container, .achievements-container, .help-container {
    padding: 2rem 1.5rem;
    max-height: 85vh;
  }
}

@media (max-width: 480px) {
  .menu-container {
    padding: 1rem 0.5rem;
  }

  .logo h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
  }

  .subtitle {
    font-size: 0.9rem;
    margin-bottom: 1rem;
  }

  .menu-section {
    margin-bottom: 1rem;
  }

  .menu-section h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
  }

  .mode-btn {
    padding: 0.85rem 0.75rem;
    min-height: 110px;
  }

  .mode-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
  }

  .mode-name {
    font-size: 1.05rem;
  }

  .mode-desc {
    font-size: 0.85rem;
  }

  .settings-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .menu-btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
  }

  .pause-container, .gameover-container {
    padding: 1.5rem 1rem;
    margin: 0.5rem;
    width: 95%;
  }

  .leaderboard-container, .achievements-container, .help-container {
    padding: 1.5rem 1rem;
    margin: 0.5rem;
    width: 95%;
  }

  /* Smaller canvas for very small screens */
  #gameCanvas {
    max-width: 92vw;
    width: 92vw;
    max-height: calc(100vh - 280px);
    max-height: calc(100dvh - 280px);
  }

  #gameHUD {
    padding: 0.3rem 0.4rem;
    gap: 0.4rem;
  }

  .hud-left, .hud-right {
    gap: 0.5rem;
  }

  #touchControls {
    display: flex; /* Show on small mobile */
    margin: 0;
    padding: 0.25rem;
    gap: 0.25rem;
  }

  .control-row {
    gap: 0.25rem;
  }

  .control-btn {
    width: 65px;
    height: 65px;
    font-size: 1.5rem;
    border-radius: 10px;
  }

  .stat-circle {
    width: 90px;
    height: 90px;
  }

  .stat-number {
    font-size: 1.3rem;
  }

  .stat-text {
    font-size: 0.75rem;
  }

  .hud-btn {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }

  .power-up-icon {
    width: 28px;
    height: 28px;
    font-size: 0.85rem;
  }

  .stat-label {
    font-size: 0.6rem;
  }

  .stat-value {
    font-size: 0.85rem;
  }

  .mode-indicator {
    font-size: 0.7rem;
    padding: 0.2rem 0.4rem;
  }

  .timer {
    font-size: 0.7rem;
  }
}

/* Landscape orientation on mobile */
@media (max-width: 768px) and (orientation: landscape) {
  #gameScreen {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    padding: 0.25rem;
    gap: 0.25rem;
  }

  #gameCanvas {
    max-height: calc(100vh - 200px);
    max-height: calc(100dvh - 200px);
    max-width: 50vw;
  }

  #gameHUD {
    flex-direction: row;
    justify-content: space-between;
    padding: 0.25rem 0.5rem;
    flex-shrink: 0;
  }

  .hud-center {
    flex-direction: row;
    gap: 0.5rem;
  }

  .stat-label {
    font-size: 0.6rem;
  }

  .stat-value {
    font-size: 0.8rem;
  }

  .mode-indicator {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
  }

  .timer {
    font-size: 0.75rem;
  }

  .hud-btn {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }

  #touchControls {
    display: flex; /* Show on landscape mobile */
    margin: 0;
    padding: 0.25rem;
    gap: 0.25rem;
    flex-shrink: 0;
  }

  #keyboardInstructions {
    display: none; /* Hide on landscape mobile */
  }

  .control-row {
    gap: 0.25rem;
  }

  .control-btn {
    width: 46px;
    height: 46px;
    font-size: 1.1rem;
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .control-btn {
    border-width: 3px;
  }
  
  .control-btn:hover {
    border-color: var(--border-color);
    box-shadow: none;
  }
  
  .control-btn:active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: var(--background-color);
    box-shadow: 0 0 15px var(--shadow-color);
  }
  
  .menu-btn:hover {
    transform: none;
    box-shadow: none;
  }
  
  .menu-btn:active {
    transform: scale(0.95);
  }
  
  .mode-btn:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border-color);
  }
  
  .mode-btn:active {
    transform: scale(0.98);
    border-color: var(--primary-color);
  }
}


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

.fade-in {
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}