:root {
  --sai-top: env(safe-area-inset-top, 0px);
  --sai-right: env(safe-area-inset-right, 0px);
  --sai-bottom: env(safe-area-inset-bottom, 0px);
  --sai-left: env(safe-area-inset-left, 0px);

  --bg: #0a0e1a;
  --panel: #1a2840;
  --border: #4a7aa0;
  --text: #ffffff;
  --accent: #00d4ff;
  --money: #ffcc00;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  font-family: 'Courier New', monospace;
  color: var(--text);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.homeBtn {
  position: fixed;
  left: 10px;
  top: 10px;
  z-index: 100;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(26,35,50,0.9);
  border: 2px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  backdrop-filter: blur(6px);
  text-shadow: 0 0 8px var(--accent);
}

.homeBtn:hover {
  background: rgba(0,255,255,0.1);
}

#game-container {
  display: flex;
  width: 100vw;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
}

#game {
  flex: 1;
  display: block;
  background: var(--bg);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: crosshair;
  min-width: 0;
}

#sidebar {
  width: 320px;
  min-width: 320px;
  max-width: 320px;
  background: var(--panel);
  border-left: 3px solid var(--border);
  padding: 16px;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: -4px 0 20px rgba(0,0,0,0.5);
}

#resources {
  background: rgba(0,0,0,0.3);
  padding: 12px;
  border-radius: 8px;
  border: 2px solid var(--border);
}

.resource-item {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 14px;
  font-weight: 700;
}

.resource-item .label {
  color: rgba(255,255,255,0.7);
}

.resource-item .value {
  color: var(--accent);
  text-shadow: 0 0 4px var(--accent);
}

/* Game Controls - Pause/Music */
#game-controls {
  display: flex;
  gap: 10px;
  background: linear-gradient(180deg, rgba(10,20,35,0.95) 0%, rgba(5,15,25,0.95) 100%);
  padding: 12px;
  border-radius: 12px;
  border: 2px solid rgba(0,212,255,0.3);
  box-shadow: 0 4px 16px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
}

.control-btn {
  flex: 1;
  padding: 14px 12px;
  border: 2px solid rgba(0,212,255,0.4);
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(20,40,60,0.95) 0%, rgba(10,25,40,0.95) 100%);
  color: var(--text);
  font-family: 'Courier New', monospace;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s ease;
  text-shadow: 0 2px 4px rgba(0,0,0,0.6);
  box-shadow:
    0 4px 12px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.1),
    inset 0 -1px 0 rgba(0,0,0,0.2);
  position: relative;
  overflow: hidden;
}

.control-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 ease;
}

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

.control-btn:hover {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(0,60,90,0.95) 0%, rgba(0,40,60,0.95) 100%);
  box-shadow:
    0 0 20px rgba(0,212,255,0.4),
    0 6px 16px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.15);
  transform: translateY(-2px);
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent);
}

.control-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

.control-btn.active {
  background: linear-gradient(180deg, rgba(0,100,130,0.95) 0%, rgba(0,70,90,0.95) 100%);
  border-color: var(--accent);
  color: var(--accent);
  text-shadow: 0 0 12px var(--accent);
  box-shadow:
    0 0 24px rgba(0,212,255,0.5),
    0 4px 12px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.2);
  animation: btn-glow 2s ease-in-out infinite;
}

@keyframes btn-glow {
  0%, 100% { box-shadow: 0 0 24px rgba(0,212,255,0.5), 0 4px 12px rgba(0,0,0,0.4); }
  50% { box-shadow: 0 0 32px rgba(0,212,255,0.7), 0 4px 16px rgba(0,0,0,0.4); }
}

/* Music Control with Volume Slider */
.music-control {
  position: relative;
  flex: 1;
}

.music-control .control-btn {
  width: 100%;
}

.volume-slider {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(15,30,50,0.98) 0%, rgba(10,20,35,0.98) 100%);
  border: 2px solid rgba(0,212,255,0.4);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.5), 0 0 20px rgba(0,212,255,0.2);
  z-index: 100;
  min-width: 140px;
}

.volume-slider.hidden {
  display: none;
}

.volume-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  background: linear-gradient(90deg, rgba(0,212,255,0.3), rgba(0,212,255,0.1));
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}

.volume-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, #00d4ff, #0088cc);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,212,255,0.5), 0 0 12px rgba(0,212,255,0.3);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.volume-slider input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 2px 12px rgba(0,212,255,0.7), 0 0 16px rgba(0,212,255,0.5);
}

.volume-slider input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, #00d4ff, #0088cc);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(0,212,255,0.5);
}

#volume-value {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-shadow: 0 0 8px var(--accent);
}

#tower-selection h3,
#tower-info h3 {
  font-size: 16px;
  margin-bottom: 12px;
  color: var(--accent);
  text-shadow: 0 0 8px var(--accent);
}

.tower-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.tower-btn {
  background: rgba(0,0,0,0.4);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text);
  font-family: 'Courier New', monospace;
}

.tower-btn:hover {
  border-color: var(--accent);
  background: rgba(0,255,255,0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,255,255,0.3);
}

.tower-btn.selected {
  border-color: var(--accent);
  background: rgba(0,255,255,0.2);
  box-shadow: 0 0 16px rgba(0,255,255,0.5);
}

.tower-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.tower-btn:disabled:hover {
  transform: none;
  box-shadow: none;
}

.tower-icon {
  width: 40px;
  height: 40px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Laser Tower - Hexagon with beam */
.laser-icon {
  background: radial-gradient(circle, #00ffff 0%, #0088ff 60%, #004488 100%);
  clip-path: polygon(30% 0%, 70% 0%, 100% 50%, 70% 100%, 30% 100%, 0% 50%);
  box-shadow: 0 0 12px #00ffff, inset 0 0 10px rgba(255,255,255,0.4);
  animation: pulse-cyan 2s ease-in-out infinite;
}

.laser-icon::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 3px;
  right: -4px;
  background: linear-gradient(90deg, #00ffff, transparent);
  box-shadow: 0 0 6px #00ffff;
  animation: beam-pulse 1s ease-in-out infinite;
}

/* Rocket Tower - Angular launcher */
.rocket-icon {
  background: linear-gradient(135deg, #ff6644 0%, #ff2200 50%, #aa0000 100%);
  border-radius: 4px;
  box-shadow: 0 0 12px #ff4444, inset 0 0 10px rgba(255,255,255,0.4);
  animation: pulse-red 2s ease-in-out infinite;
}

.rocket-icon::before {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  right: -6px;
  border-left: 8px solid #ff4444;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  filter: drop-shadow(0 0 4px #ff4444);
}

.rocket-icon::after {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #ffffff;
  border-radius: 50%;
  box-shadow: 0 0 8px #ffffff;
}

/* Plasma Tower - Ringed energy sphere */
.plasma-icon {
  background: radial-gradient(circle, #dd44ff 0%, #aa00ff 50%, #6600aa 100%);
  border-radius: 50%;
  box-shadow: 0 0 12px #aa44ff, inset 0 0 10px rgba(255,255,255,0.4);
  animation: pulse-purple 2s ease-in-out infinite;
}

.plasma-icon::before {
  content: '';
  position: absolute;
  width: 28px;
  height: 28px;
  border: 2px solid #dd44ff;
  border-radius: 50%;
  opacity: 0.6;
  animation: ring-expand 2s ease-in-out infinite;
}

.plasma-icon::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  background: #ffffff;
  border-radius: 50%;
  opacity: 0.8;
  box-shadow: 0 0 10px #ffffff;
}

/* Tesla Tower - Electric coil with zigzag */
.tesla-icon {
  background: linear-gradient(135deg, #ffff44 0%, #ffdd00 50%, #aaaa00 100%);
  clip-path: polygon(20% 0%, 80% 0%, 100% 30%, 80% 50%, 100% 70%, 80% 100%, 20% 100%, 0% 70%, 20% 50%, 0% 30%);
  box-shadow: 0 0 12px #ffff00, inset 0 0 10px rgba(255,255,255,0.4);
  animation: pulse-yellow 2s ease-in-out infinite;
}

.tesla-icon::after {
  content: '';
  position: absolute;
  width: 3px;
  height: 20px;
  background: linear-gradient(180deg,
    transparent 0%,
    #ffffff 10%,
    transparent 20%,
    #ffffff 30%,
    transparent 40%,
    #ffffff 50%,
    transparent 60%,
    #ffffff 70%,
    transparent 80%,
    #ffffff 90%,
    transparent 100%);
  box-shadow: 0 0 8px #ffff00;
  animation: lightning-flicker 0.8s ease-in-out infinite;
}

@keyframes pulse-cyan {
  0%, 100% { box-shadow: 0 0 12px #00ffff, inset 0 0 10px rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 20px #00ffff, inset 0 0 15px rgba(255,255,255,0.6); }
}

@keyframes pulse-red {
  0%, 100% { box-shadow: 0 0 12px #ff4444, inset 0 0 10px rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 20px #ff4444, inset 0 0 15px rgba(255,255,255,0.6); }
}

@keyframes pulse-purple {
  0%, 100% { box-shadow: 0 0 12px #aa44ff, inset 0 0 10px rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 20px #aa44ff, inset 0 0 15px rgba(255,255,255,0.6); }
}

@keyframes pulse-yellow {
  0%, 100% { box-shadow: 0 0 12px #ffff00, inset 0 0 10px rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 20px #ffff00, inset 0 0 15px rgba(255,255,255,0.6); }
}

@keyframes beam-pulse {
  0%, 100% { opacity: 0.6; width: 16px; }
  50% { opacity: 1; width: 20px; }
}

@keyframes ring-expand {
  0%, 100% { transform: scale(0.8); opacity: 0.6; }
  50% { transform: scale(1.1); opacity: 0.3; }
}

@keyframes lightning-flicker {
  0%, 100% { opacity: 0.8; }
  25% { opacity: 1; }
  50% { opacity: 0.6; }
  75% { opacity: 1; }
}

@keyframes flame-dance {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.8; }
  50% { transform: translateY(-2px) scale(1.1); opacity: 1; }
}

/* Sniper Tower - Long barrel with scope */
.sniper-icon {
  background: linear-gradient(135deg, #00ff66 0%, #00aa44 50%, #006622 100%);
  border-radius: 4px 0 0 4px;
  box-shadow: 0 0 12px #00ff66, inset 0 0 10px rgba(255,255,255,0.4);
  animation: pulse-green 2s ease-in-out infinite;
}

.sniper-icon::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 4px;
  right: -16px;
  background: linear-gradient(90deg, #00ff66, #00aa44);
  box-shadow: 0 0 6px #00ff66;
}

.sniper-icon::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  border: 2px solid #00ff66;
  border-radius: 50%;
  box-shadow: 0 0 8px #00ff66, inset 0 0 4px #ffffff;
}

/* Flame Tower - Fire shape with flames */
.flame-icon {
  background: linear-gradient(0deg, #ff4400 0%, #ff6600 50%, #ff8800 100%);
  clip-path: polygon(50% 0%, 70% 30%, 85% 60%, 70% 100%, 30% 100%, 15% 60%, 30% 30%);
  box-shadow: 0 0 12px #ff6600, inset 0 0 10px rgba(255,255,255,0.4);
  animation: pulse-orange 2s ease-in-out infinite;
}

.flame-icon::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: radial-gradient(circle, #ffff00 0%, #ff8800 50%, transparent 100%);
  clip-path: polygon(50% 0%, 70% 40%, 60% 100%, 40% 100%, 30% 40%);
  animation: flame-dance 1s ease-in-out infinite;
}

.flame-icon::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 12px;
  background: radial-gradient(circle, #ffffff 0%, #ffff00 40%, transparent 100%);
  clip-path: polygon(50% 0%, 65% 50%, 50% 100%, 35% 50%);
  animation: flame-dance 1.2s ease-in-out infinite reverse;
}

@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 12px #00ff66, inset 0 0 10px rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 20px #00ff66, inset 0 0 15px rgba(255,255,255,0.6); }
}

@keyframes pulse-orange {
  0%, 100% { box-shadow: 0 0 12px #ff6600, inset 0 0 10px rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 20px #ff6600, inset 0 0 15px rgba(255,255,255,0.6); }
}

/* Railgun Tower - Long barrel with energy core */
.railgun-icon {
  background: linear-gradient(135deg, #00ccff 0%, #0088ff 50%, #0055aa 100%);
  border-radius: 4px 0 0 4px;
  box-shadow: 0 0 12px #00aaff, inset 0 0 10px rgba(255,255,255,0.4);
  animation: pulse-lightblue 2s ease-in-out infinite;
}

.railgun-icon::before {
  content: '';
  position: absolute;
  width: 24px;
  height: 3px;
  right: -18px;
  background: linear-gradient(90deg, #00aaff, #ffffff, #00aaff);
  box-shadow: 0 0 8px #00aaff;
  animation: railgun-charge 1.5s ease-in-out infinite;
}

.railgun-icon::after {
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  background: radial-gradient(circle, #ffffff 0%, #00ddff 50%, transparent 100%);
  box-shadow: 0 0 10px #00ddff;
  animation: pulse-lightblue 1s ease-in-out infinite;
}

@keyframes pulse-lightblue {
  0%, 100% { box-shadow: 0 0 12px #00aaff, inset 0 0 10px rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 20px #00aaff, inset 0 0 15px rgba(255,255,255,0.6); }
}

@keyframes railgun-charge {
  0%, 100% { opacity: 0.6; box-shadow: 0 0 8px #00aaff; }
  50% { opacity: 1; box-shadow: 0 0 16px #00aaff, 0 0 24px #00aaff; }
}

/* Freeze Tower - Ice crystal shape */
.freeze-icon {
  background: radial-gradient(circle, #ffffff 0%, #88ddff 40%, #44aadd 100%);
  clip-path: polygon(50% 0%, 65% 35%, 100% 35%, 70% 55%, 80% 100%, 50% 70%, 20% 100%, 30% 55%, 0% 35%, 35% 35%);
  box-shadow: 0 0 12px #88ddff, inset 0 0 10px rgba(255,255,255,0.6);
  animation: pulse-ice 2s ease-in-out infinite;
}

.freeze-icon::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 50%;
  animation: freeze-ring 2s ease-in-out infinite;
}

.freeze-icon::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background: #ffffff;
  border-radius: 50%;
  box-shadow: 0 0 8px #ffffff;
}

@keyframes pulse-ice {
  0%, 100% { box-shadow: 0 0 12px #88ddff, inset 0 0 10px rgba(255,255,255,0.6); }
  50% { box-shadow: 0 0 24px #88ddff, inset 0 0 15px rgba(255,255,255,0.8); }
}

@keyframes freeze-ring {
  0%, 100% { transform: scale(0.8); opacity: 0.6; }
  50% { transform: scale(1.2); opacity: 0.3; }
}

/* ANNIHILATOR Tower - ULTIMATE WEAPON OF DOOM */
.annihilator-btn {
  background: linear-gradient(180deg, rgba(80,0,0,0.95) 0%, rgba(40,0,0,0.95) 100%) !important;
  border-color: #ff0000 !important;
  animation: annihilator-btn-pulse 0.5s ease-in-out infinite !important;
}

.annihilator-btn:hover {
  background: linear-gradient(180deg, rgba(120,0,0,0.95) 0%, rgba(60,0,0,0.95) 100%) !important;
  box-shadow: 0 0 30px #ff0000, 0 0 60px #ff6600 !important;
}

.annihilator-btn .tower-name {
  color: #ff0000 !important;
  text-shadow: 0 0 10px #ff0000, 0 0 20px #ff6600 !important;
  animation: doom-text 0.3s ease-in-out infinite !important;
}

.annihilator-btn .tower-cost {
  color: #ffff00 !important;
  text-shadow: 0 0 8px #ffff00 !important;
}

@keyframes annihilator-btn-pulse {
  0%, 100% { box-shadow: 0 0 20px #ff0000, inset 0 0 10px rgba(255,0,0,0.3); }
  50% { box-shadow: 0 0 40px #ff0000, 0 0 60px #ff6600, inset 0 0 20px rgba(255,0,0,0.5); }
}

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

.annihilator-icon {
  background: radial-gradient(circle, #ffffff 0%, #ffff00 20%, #ff6600 40%, #ff0000 60%, #880000 100%);
  border-radius: 50%;
  box-shadow:
    0 0 20px #ff0000,
    0 0 40px #ff6600,
    0 0 60px #ffff00,
    inset 0 0 15px rgba(255,255,255,0.8);
  animation: annihilator-pulse 0.3s ease-in-out infinite;
}

.annihilator-icon::before {
  content: '';
  position: absolute;
  width: 30px;
  height: 30px;
  border: 3px solid #ff0000;
  border-radius: 50%;
  animation: annihilator-ring 0.5s linear infinite;
  box-shadow: 0 0 15px #ff0000;
}

.annihilator-icon::after {
  content: '☠';
  position: absolute;
  font-size: 14px;
  color: #000000;
  text-shadow: 0 0 5px #ff0000;
  animation: skull-shake 0.1s ease-in-out infinite;
}

@keyframes annihilator-pulse {
  0%, 100% {
    box-shadow: 0 0 20px #ff0000, 0 0 40px #ff6600, 0 0 60px #ffff00, inset 0 0 15px rgba(255,255,255,0.8);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 40px #ff0000, 0 0 80px #ff6600, 0 0 120px #ffff00, inset 0 0 20px rgba(255,255,255,1);
    transform: scale(1.1);
  }
}

@keyframes annihilator-ring {
  0% { transform: scale(0.8) rotate(0deg); opacity: 1; }
  100% { transform: scale(1.5) rotate(180deg); opacity: 0; }
}

@keyframes skull-shake {
  0%, 100% { transform: translateX(-1px); }
  50% { transform: translateX(1px); }
}

.tower-name {
  font-size: 12px;
  font-weight: 700;
}

.tower-cost {
  font-size: 11px;
  color: var(--money);
}

#tower-stats {
  background: rgba(0,0,0,0.3);
  padding: 10px;
  border-radius: 6px;
  margin-bottom: 10px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  font-size: 12px;
}

.stat-label {
  color: rgba(255,255,255,0.7);
}

.action-btn {
  width: 100%;
  padding: 10px;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: rgba(0,0,0,0.4);
  color: var(--text);
  font-family: 'Courier New', monospace;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 8px;
}

.action-btn:hover {
  border-color: var(--accent);
  background: rgba(0,255,255,0.1);
}

.action-btn.primary {
  background: rgba(0,255,255,0.2);
  border-color: var(--accent);
  color: var(--accent);
  text-shadow: 0 0 4px var(--accent);
}

.action-btn.primary:hover {
  background: rgba(0,255,255,0.3);
  box-shadow: 0 0 12px rgba(0,255,255,0.5);
}

.action-btn.sell {
  background: rgba(255,68,68,0.2);
  border-color: #ff4444;
  color: #ff4444;
}

.action-btn.sell:hover {
  background: rgba(255,68,68,0.3);
  border-color: #ff6666;
}

.action-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#wave-timer {
  text-align: center;
  font-size: 13px;
  padding: 8px;
  background: rgba(0,0,0,0.3);
  border-radius: 6px;
  color: var(--accent);
}

#game-info {
  margin-top: auto;
  padding-top: 16px;
  border-top: 2px solid var(--border);
}

.info-text {
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 6px;
  line-height: 1.4;
}

/* Overlays */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(10,14,26,0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(8px);
}

.menu-content {
  text-align: center;
  max-width: 500px;
  padding: 32px;
}

.menu-content h1 {
  font-size: 48px;
  margin-bottom: 16px;
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent), 0 0 40px var(--accent);
  animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { text-shadow: 0 0 20px var(--accent), 0 0 40px var(--accent); }
  50% { text-shadow: 0 0 30px var(--accent), 0 0 60px var(--accent); }
}

.subtitle {
  font-size: 16px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
}

.difficulty-selection {
  margin-bottom: 32px;
}

.difficulty-selection h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--accent);
}

.menu-btn {
  display: block;
  width: 100%;
  padding: 16px 24px;
  margin-bottom: 12px;
  border: 3px solid var(--accent);
  border-radius: 8px;
  background: rgba(0,255,255,0.1);
  color: var(--accent);
  font-family: 'Courier New', monospace;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  text-shadow: 0 0 8px var(--accent);
}

.menu-btn:hover {
  background: rgba(0,255,255,0.2);
  box-shadow: 0 0 20px rgba(0,255,255,0.5);
  transform: translateY(-2px);
}

.instructions {
  text-align: left;
  background: rgba(0,0,0,0.3);
  padding: 16px;
  border-radius: 8px;
  border: 2px solid var(--border);
}

.instructions h4 {
  font-size: 14px;
  margin-bottom: 12px;
  color: var(--accent);
}

.instructions ul {
  list-style: none;
  padding: 0;
}

.instructions li {
  font-size: 13px;
  margin-bottom: 8px;
  color: rgba(255,255,255,0.8);
}

@media (max-width: 900px) {
  #game-container {
    flex-direction: column;
  }

  #sidebar {
    width: 100%;
    max-height: 40%;
    border-left: none;
    border-top: 3px solid var(--border);
  }

  .tower-buttons {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Start Wave Button Overlay */
#start-wave-overlay {
  position: absolute;
  top: 80px;
  left: 0;
  right: 320px;
  z-index: 99;
  display: flex;
  justify-content: center;
  align-items: center;
}

#start-wave-overlay.hidden {
  display: none;
}

.start-wave-big-btn {
  padding: 20px 60px;
  font-size: 28px;
  font-weight: 900;
  font-family: 'Courier New', monospace;
  letter-spacing: 4px;
  color: #ffffff;
  background: linear-gradient(135deg, rgba(0,212,255,0.3) 0%, rgba(0,100,200,0.4) 100%);
  border: 4px solid var(--accent);
  border-radius: 16px;
  cursor: pointer;
  text-shadow: 0 0 20px var(--accent), 0 0 40px var(--accent);
  box-shadow:
    0 0 30px rgba(0,212,255,0.5),
    0 0 60px rgba(0,212,255,0.3),
    inset 0 0 20px rgba(0,212,255,0.2);
  animation: start-btn-pulse 1.5s ease-in-out infinite;
  transition: all 0.2s ease;
}

.start-wave-big-btn:hover {
  transform: scale(1.05);
  background: linear-gradient(135deg, rgba(0,212,255,0.5) 0%, rgba(0,150,255,0.5) 100%);
  box-shadow:
    0 0 50px rgba(0,212,255,0.7),
    0 0 80px rgba(0,212,255,0.5),
    inset 0 0 30px rgba(0,212,255,0.3);
}

.start-wave-big-btn:active {
  transform: scale(0.98);
}

.start-wave-big-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  animation: none;
}

@keyframes start-btn-pulse {
  0%, 100% {
    box-shadow:
      0 0 30px rgba(0,212,255,0.5),
      0 0 60px rgba(0,212,255,0.3),
      inset 0 0 20px rgba(0,212,255,0.2);
  }
  50% {
    box-shadow:
      0 0 50px rgba(0,212,255,0.7),
      0 0 80px rgba(0,212,255,0.5),
      inset 0 0 30px rgba(0,212,255,0.3);
  }
}

/* Wave Announcement Banner */
.wave-announcement {
  position: absolute;
  top: 0;
  left: 0;
  right: 320px;
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  pointer-events: none;
}

.wave-announcement.hidden {
  display: none;
}

.wave-announcement-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(135deg, rgba(0,0,0,0.95) 0%, rgba(20,30,50,0.95) 100%);
  border: 4px solid var(--accent);
  border-radius: 16px;
  padding: 20px 60px;
  box-shadow:
    0 0 40px rgba(0,212,255,0.6),
    0 0 80px rgba(0,212,255,0.3),
    inset 0 0 30px rgba(0,212,255,0.1);
  animation: wave-banner-pulse 0.5s ease-out, wave-banner-glow 1s ease-in-out infinite;
}

.wave-label {
  font-size: 18px;
  font-weight: 700;
  color: rgba(255,255,255,0.8);
  letter-spacing: 8px;
  text-transform: uppercase;
}

.wave-number {
  font-size: 72px;
  font-weight: 900;
  color: var(--accent);
  text-shadow:
    0 0 20px var(--accent),
    0 0 40px var(--accent),
    0 0 60px var(--accent);
  line-height: 1;
  animation: wave-number-pulse 0.8s ease-in-out infinite;
}

.wave-sublabel {
  font-size: 24px;
  font-weight: 700;
  color: #ff4444;
  letter-spacing: 4px;
  text-shadow: 0 0 10px #ff4444;
  animation: wave-sublabel-flash 0.3s ease-in-out infinite;
}

@keyframes wave-banner-pulse {
  0% { transform: scale(0.5); opacity: 0; }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes wave-banner-glow {
  0%, 100% { box-shadow: 0 0 40px rgba(0,212,255,0.6), 0 0 80px rgba(0,212,255,0.3), inset 0 0 30px rgba(0,212,255,0.1); }
  50% { box-shadow: 0 0 60px rgba(0,212,255,0.8), 0 0 100px rgba(0,212,255,0.5), inset 0 0 40px rgba(0,212,255,0.2); }
}

@keyframes wave-number-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes wave-sublabel-flash {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Wave Complete Banner - Centered */
.wave-complete {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 100;
  pointer-events: none;
}

.wave-complete.hidden {
  display: none;
}

.wave-complete-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, rgba(0,50,0,0.95) 0%, rgba(0,80,40,0.95) 100%);
  border: 4px solid #00ff88;
  border-radius: 16px;
  padding: 30px 60px;
  box-shadow:
    0 0 40px rgba(0,255,136,0.6),
    0 0 80px rgba(0,255,136,0.3);
  animation: wave-complete-popup 0.5s ease-out;
}

.wave-complete-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  color: rgba(255,255,255,0.7);
  font-size: 28px;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  pointer-events: auto;
  transition: color 0.2s, transform 0.2s;
}

.wave-complete-close:hover {
  color: #ffffff;
  transform: scale(1.2);
}

.complete-label {
  font-size: 36px;
  font-weight: 900;
  color: #00ff88;
  text-shadow: 0 0 20px #00ff88, 0 0 40px #00ff88;
  letter-spacing: 4px;
}

.complete-message {
  font-size: 16px;
  color: rgba(255,255,255,0.9);
  text-align: center;
}

@keyframes wave-complete-popup {
  0% { transform: scale(0.5); opacity: 0; }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

@media (max-width: 900px) {
  #start-wave-overlay {
    right: 0;
    top: 60px;
  }

  .start-wave-big-btn {
    padding: 16px 40px;
    font-size: 22px;
  }

  .wave-announcement {
    right: 0;
    top: auto;
    bottom: 40%;
  }
}