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

:root {
  --bg-dark: #0d0d1a;
  --bg-mid: #1a1a2e;
  --bg-panel: #16213e;
  --cyan: #00f5ff;
  --green: #39ff14;
  --orange: #ff6b35;
  --red: #ff2e63;
  --gold: #ffd700;
  --text: #e0e0e0;
  --text-dim: #7a7a9e;
  --font-pixel: 'Silkscreen', cursive;
  --font-mono: 'JetBrains Mono', monospace;
}

body {
  background: var(--bg-dark);
  color: var(--text);
  font-family: var(--font-mono);
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  position: relative;
}

#canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: crosshair;
}

#hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 48px;
  background: linear-gradient(180deg, rgba(13,13,26,0.95) 0%, rgba(13,13,26,0.7) 100%);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 100;
  border-bottom: 1px solid rgba(0,245,255,0.15);
  font-size: 13px;
  font-weight: 700;
}

#hud-left, #hud-center, #hud-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

#company-name {
  font-family: var(--font-pixel);
  font-size: 14px;
  color: var(--cyan);
  text-shadow: 0 0 10px rgba(0,245,255,0.4);
}

#money-display {
  color: var(--gold);
  text-shadow: 0 0 8px rgba(255,215,0,0.3);
  font-size: 14px;
  min-width: 100px;
}

#wave-display {
  font-family: var(--font-pixel);
  color: var(--orange);
  font-size: 13px;
}

#population-display { color: #8be9fd; }
#coverage-display { color: var(--green); }
#map-size-display { color: var(--cyan); font-size: 11px; opacity: 0.7; }
#satisfaction-display { color: var(--orange); }

#speed-controls {
  display: flex;
  gap: 4px;
}

.speed-btn {
  background: rgba(0,245,255,0.1);
  border: 1px solid rgba(0,245,255,0.3);
  color: var(--cyan);
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
}

.speed-btn:hover, .speed-btn.active {
  background: rgba(0,245,255,0.25);
  border-color: var(--cyan);
  box-shadow: 0 0 8px rgba(0,245,255,0.3);
}

#toolbar {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  background: linear-gradient(180deg, rgba(22,33,62,0.95) 0%, rgba(13,13,26,0.95) 100%);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  border: 1px solid rgba(0,245,255,0.15);
  z-index: 100;
  max-width: 95vw;
  overflow-x: auto;
}

.tower-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  cursor: pointer;
  transition: all 0.2s;
  min-width: 80px;
  user-select: none;
}

.tower-card:hover {
  border-color: var(--cyan);
  background: rgba(0,245,255,0.08);
  transform: translateY(-2px);
}

.tower-card.selected {
  border-color: var(--cyan);
  background: rgba(0,245,255,0.15);
  box-shadow: 0 0 16px rgba(0,245,255,0.3);
}

.tower-card.disabled {
  opacity: 0.35;
  pointer-events: none;
}

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

.tower-icon img {
  width: 40px;
  height: 40px;
  image-rendering: pixelated;
}

.tower-info {
  text-align: center;
}

.tower-name {
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
}

.tower-cost {
  font-size: 10px;
  color: var(--gold);
}

.tower-stats {
  font-size: 8px;
  color: var(--text-dim);
  line-height: 1.2;
}

.deselect-btn {
  min-width: 50px;
}

#upgrade-panel {
  position: fixed;
  top: 60px;
  right: 12px;
  width: 220px;
  background: rgba(22,33,62,0.95);
  backdrop-filter: blur(10px);
  border-radius: 10px;
  border: 1px solid rgba(0,245,255,0.2);
  z-index: 100;
  padding: 12px;
  box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}

#upgrade-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

#upgrade-title {
  font-family: var(--font-pixel);
  font-size: 13px;
  color: var(--cyan);
}

#upgrade-close {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 16px;
}

#upgrade-stats {
  font-size: 11px;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 10px;
}

#upgrade-actions {
  display: flex;
  gap: 6px;
}

.action-btn {
  flex: 1;
  padding: 6px;
  border: 1px solid;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.action-btn.upgrade {
  background: rgba(57,255,20,0.1);
  border-color: var(--green);
  color: var(--green);
}

.action-btn.upgrade:hover {
  background: rgba(57,255,20,0.25);
}

.action-btn.sell {
  background: rgba(255,107,53,0.1);
  border-color: var(--orange);
  color: var(--orange);
}

.action-btn.sell:hover {
  background: rgba(255,107,53,0.25);
}

.action-btn:disabled {
  opacity: 0.3;
  pointer-events: none;
}

#wave-banner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 200;
  pointer-events: none;
}

#wave-banner-text {
  font-family: var(--font-pixel);
  font-size: 28px;
  color: var(--cyan);
  text-shadow: 0 0 30px rgba(0,245,255,0.6), 0 0 60px rgba(0,245,255,0.3);
  text-align: center;
  animation: wavePulse 2s ease-in-out;
  white-space: nowrap;
}

@keyframes wavePulse {
  0% { opacity: 0; transform: scale(0.5); }
  20% { opacity: 1; transform: scale(1.1); }
  80% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.3); }
}

#tutorial-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
}

#tutorial-box {
  background: var(--bg-panel);
  border: 2px solid var(--cyan);
  border-radius: 12px;
  padding: 24px 32px;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 0 40px rgba(0,245,255,0.2);
}

#tutorial-text {
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 16px;
  color: var(--text);
}

#tutorial-next {
  background: linear-gradient(135deg, var(--cyan), #0088ff);
  border: none;
  color: #000;
  padding: 10px 24px;
  border-radius: 8px;
  font-family: var(--font-pixel);
  font-size: 14px;
  cursor: pointer;
  font-weight: 700;
  transition: all 0.2s;
}

#tutorial-next:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(0,245,255,0.4);
}

#gameover-screen {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
}

#gameover-box {
  background: var(--bg-panel);
  border: 2px solid var(--red);
  border-radius: 16px;
  padding: 32px 40px;
  text-align: center;
  max-width: 420px;
  box-shadow: 0 0 60px rgba(255,46,99,0.3);
}

#gameover-box h1 {
  font-family: var(--font-pixel);
  font-size: 24px;
  color: var(--red);
  margin-bottom: 8px;
}

#gameover-box p {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 16px;
}

#gameover-stats {
  font-size: 13px;
  line-height: 1.8;
  text-align: left;
  margin-bottom: 20px;
  padding: 12px;
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
}

#btn-playagain {
  background: linear-gradient(135deg, var(--green), #00cc44);
  border: none;
  color: #000;
  padding: 12px 32px;
  border-radius: 8px;
  font-family: var(--font-pixel);
  font-size: 16px;
  cursor: pointer;
  font-weight: 700;
}

#toast-container {
  position: fixed;
  top: 56px;
  right: 12px;
  z-index: 150;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toast {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 6px;
  animation: toastIn 0.3s ease, toastOut 0.5s ease 1.5s forwards;
  white-space: nowrap;
}

.toast.money {
  background: rgba(255,215,0,0.15);
  border: 1px solid var(--gold);
  color: var(--gold);
}

.toast.achievement {
  background: rgba(0,245,255,0.15);
  border: 1px solid var(--cyan);
  color: var(--cyan);
}

.toast.warning {
  background: rgba(255,46,99,0.15);
  border: 1px solid var(--red);
  color: var(--red);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  to { opacity: 0; transform: translateY(-10px); }
}

.hidden { display: none !important; }

#footer {
  position: fixed;
  bottom: 4px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 10px;
  color: var(--text-dim);
  z-index: 50;
  pointer-events: none;
}

#footer a {
  color: var(--cyan);
  text-decoration: none;
  pointer-events: all;
}

@media (max-width: 700px) {
  #hud { font-size: 10px; padding: 0 8px; height: 40px; }
  #company-name { display: none; }
  #hud-left, #hud-center, #hud-right { gap: 8px; }
  .tower-card { min-width: 60px; padding: 4px 6px; }
  .tower-name { font-size: 8px; }
  .tower-cost { font-size: 8px; }
  .tower-stats { display: none; }
  .tower-icon { width: 32px; height: 32px; }
  .tower-icon img { width: 32px; height: 32px; }
  #toolbar { bottom: 24px; gap: 4px; padding: 6px 8px; }
  #wave-banner-text { font-size: 18px; }
  #upgrade-panel { width: 180px; right: 6px; }
}