:root {
  --bg-app: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.9);
  --border-card: rgba(255, 255, 255, 0.12);

  --color-gold: #f59e0b;
  --color-green: #10b981;
  --color-blue: #3b82f6;
  --color-wood: #b45309;

  --text-primary: #ffffff;
  --text-secondary: #94a3b8;

  --radius-xl: 20px;
  --radius-lg: 14px;
  --radius-md: 10px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-app);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-primary);
}

#game-container {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  touch-action: none;
}

#game-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Header HUD */
#hud {
  position: absolute;
  top: 14px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 18px;
  pointer-events: none;
  z-index: 10;
}

.hud-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-card);
  padding: 8px 14px;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

.hud-icon {
  font-size: 20px;
}

.hud-val {
  font-size: 16px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.hud-cash .hud-val {
  color: var(--color-gold);
}

.hud-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-lg);
  padding: 8px 16px;
  color: #fff;
  font-weight: 800;
  font-size: 13px;
  cursor: pointer;
  pointer-events: auto;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
  transition: transform 0.12s ease;
}

.hud-btn:active {
  transform: scale(0.96);
}

/* Overlays */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 15, 30, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 30;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.overlay.hidden {
  display: none !important;
}

.menu-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  width: 100%;
  max-width: 440px;
  text-align: center;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  animation: cardIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes cardIn {
  from { opacity: 0; transform: scale(0.94); }
  to { opacity: 1; transform: scale(1); }
}

.menu-badge {
  display: inline-block;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.35);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.2px;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.menu-title {
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.menu-subtitle {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 20px;
}

.guide-box {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 22px;
  font-size: 12.5px;
  color: var(--text-secondary);
}

.key-pill {
  display: inline-block;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  padding: 2px 7px;
  border-radius: 6px;
  font-weight: 800;
  font-size: 11px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-md);
  padding: 12px 20px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.12s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
}

.start-cta {
  width: 100%;
}

/* Upgrades Modal */
.upgrades-card {
  max-width: 480px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  text-align: left;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-card);
}

.modal-header h2 {
  font-size: 20px;
  font-weight: 800;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 4px 8px;
}

.upgrades-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
}

.upgrade-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.upg-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.upg-icon {
  font-size: 26px;
}

.upg-text strong {
  display: block;
  font-size: 14px;
  color: #fff;
}

.upg-text small {
  font-size: 12px;
  color: var(--text-secondary);
}

.upg-buy-btn {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  color: #fff;
  font-weight: 800;
  font-size: 12.5px;
  cursor: pointer;
  white-space: nowrap;
}

.upg-buy-btn:disabled {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  cursor: not-allowed;
}

/* Virtual Joystick */
.joystick-container {
  position: absolute;
  bottom: 30px;
  left: 30px;
  width: 120px;
  height: 120px;
  z-index: 20;
  pointer-events: none;
}

.joystick-base {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.joystick-knob {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  position: absolute;
}