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

body {
  background: #0a0a0f;
  color: #e0e0e0;
  font-family: 'Segoe UI', 'Courier New', monospace;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  overflow: hidden;
}

#game-container {
  position: relative;
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
}

#game-canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  background: #0d0d14;
  border: 2px solid #2a2a3a;
  border-radius: 8px;
  box-shadow: 0 0 30px rgba(0, 200, 255, 0.1);
}

#hud {
  display: flex;
  justify-content: space-between;
  padding: 12px 8px;
  font-size: 14px;
  letter-spacing: 1px;
}

.hud-item {
  color: #8888aa;
}

.hud-item span {
  color: #00ddff;
  font-weight: bold;
}

/* Overlay screens */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(5, 5, 10, 0.92);
  border-radius: 8px;
  z-index: 10;
  gap: 16px;
  padding: 30px;
  text-align: center;
}

.overlay h1 {
  font-size: 48px;
  letter-spacing: 8px;
  color: #00ddff;
  text-shadow: 0 0 20px rgba(0, 200, 255, 0.5);
}

.overlay h2 {
  font-size: 36px;
  letter-spacing: 4px;
  color: #ffaa44;
  text-shadow: 0 0 20px rgba(255, 170, 68, 0.5);
}

.subtitle {
  color: #6677aa;
  font-size: 16px;
  letter-spacing: 3px;
}

.controls-info {
  color: #5566aa;
  font-size: 13px;
  line-height: 1.8;
}

.level-desc {
  color: #88aacc;
  font-size: 16px;
}

.btn {
  background: transparent;
  border: 2px solid #00ddff;
  color: #00ddff;
  font-family: inherit;
  font-size: 18px;
  letter-spacing: 3px;
  padding: 14px 40px;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
}

.btn:hover {
  background: #00ddff;
  color: #0a0a0f;
  box-shadow: 0 0 30px rgba(0, 200, 255, 0.4);
}

.hidden {
  display: none !important;
}

/* Help button */
.help-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(20, 25, 40, 0.75);
  border: 2px solid #00ddff;
  color: #00ddff;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  z-index: 20;
  transition: background 0.2s;
}

.help-btn:hover {
  background: #00ddff;
  color: #0a0a0f;
  box-shadow: 0 0 20px rgba(0, 200, 255, 0.5);
}

/* Help popup */
.help-popup {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(5, 5, 10, 0.85);
  z-index: 30;
  border-radius: 8px;
}

.help-box {
  position: relative;
  background: #12121a;
  border: 2px solid #00ddff;
  border-radius: 8px;
  padding: 28px 32px;
  max-width: 340px;
  box-shadow: 0 0 40px rgba(0, 200, 255, 0.3);
}

.help-box h3 {
  color: #00ddff;
  letter-spacing: 4px;
  margin-bottom: 16px;
  text-align: center;
}

.help-content {
  color: #8899bb;
  font-size: 14px;
  line-height: 1.9;
}

.help-content strong {
  color: #ccddff;
}

.help-close {
  position: absolute;
  top: 6px;
  right: 10px;
  background: transparent;
  border: none;
  color: #00ddff;
  font-size: 22px;
  cursor: pointer;
  padding: 4px;
}

.help-close:hover {
  color: #ffffff;
}

/* Mobile touch controls — swipe gestures only */
#touch-controls {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 5;
  touch-action: none;
}

@media (pointer: coarse) {
  #touch-controls {
    display: block;
  }
}

#touch-controls .swipe-area {
  position: absolute;
  width: 33.33%;
  height: 100%;
}

#touch-up    { top: 0; left: 33.33%; width: 33.33%; height: 50%; }
#touch-down  { bottom: 0; left: 33.33%; width: 33.33%; height: 50%; }
#touch-left  { top: 0; left: 0; width: 33.33%; height: 100%; }
#touch-right { top: 0; right: 0; width: 33.33%; height: 100%; }