/* ============================================
   CHĂN KIẾN - ANT HERDING GAME
   Design System & Styles
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary: #0a0e27;
  --bg-secondary: #0d1333;
  --bg-accent: #1a0a2e;
  --neon-green: #00ff88;
  --neon-green-dim: #00cc6a;
  --neon-glow: rgba(0, 255, 136, 0.4);
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: rgba(0, 0, 0, 0.3);
  --text-primary: #f0f0f0;
  --text-secondary: rgba(255, 255, 255, 0.6);
  --text-accent: #00ff88;
  --danger: #ff4d6a;
  --gold: #ffd700;
  --font-main: 'Outfit', sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
  --transition-slow: 0.6s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  user-select: none;
  touch-action: none;
}

/* --- Game Container --- */
#game-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
}

/* --- Glass Panel Utility --- */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 32px var(--glass-shadow);
}

/* --- HUD --- */
#hud {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  border-radius: var(--radius-xl);
  z-index: 10;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

#hud.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.hud-item {
  font-size: 1.1rem;
  font-weight: 600;
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.hud-divider {
  width: 1px;
  height: 20px;
  background: var(--glass-border);
}

/* --- Add Ant FAB --- */
#add-ant-btn {
  position: fixed;
  bottom: 32px;
  right: 32px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.15), rgba(0, 255, 136, 0.05));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(0, 255, 136, 0.3);
  border-radius: var(--radius-xl);
  color: var(--neon-green);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.1), 0 4px 16px var(--glass-shadow);
}

#add-ant-btn.visible {
  opacity: 1;
  pointer-events: auto;
  animation: fabEntrance 0.5s ease backwards;
}

#add-ant-btn:hover {
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.25), rgba(0, 255, 136, 0.1));
  border-color: rgba(0, 255, 136, 0.5);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.2), 0 4px 20px var(--glass-shadow);
  transform: scale(1.05);
}

#add-ant-btn:active {
  transform: scale(0.95);
}

.fab-icon {
  font-size: 1.2rem;
}

/* --- Drawing Instruction --- */
#draw-instruction {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  z-index: 10;
}

#draw-instruction.visible {
  opacity: 1;
  animation: instructionPulse 2s ease-in-out infinite;
}

.instruction-icon {
  font-size: 3rem;
  animation: bounce 1.5s ease-in-out infinite;
}

.instruction-text {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

/* --- Overlay Screens (Start & Game Over) --- */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

.overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.overlay::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(10, 14, 39, 0.7), rgba(10, 14, 39, 0.95));
}

.overlay-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 40px;
  max-width: 420px;
  width: 90%;
  animation: slideUp 0.6s ease backwards;
}

.overlay.visible .overlay-content {
  animation: slideUp 0.6s ease backwards;
}

/* --- Start Screen --- */
.lang-switcher-container {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-bottom: -8px;
}

.lang-switcher {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: linear-gradient(135deg, rgba(0, 243, 255, 0.2), rgba(0, 243, 255, 0.08));
  border-color: rgba(0, 243, 255, 0.4);
  color: var(--neon-cyan);
  box-shadow: 0 0 12px rgba(0, 243, 255, 0.2);
}

.game-title {
  display: flex;
  align-items: center;
  gap: 16px;
}

.title-emoji {
  font-size: 3.5rem;
  animation: antWalk 1s ease-in-out infinite;
}

.title-text {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--neon-green), #00ccff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 0 20px rgba(0, 255, 136, 0.3));
}

.game-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  text-align: center;
  letter-spacing: 0.5px;
}

/* --- Mode Switcher --- */
.mode-switcher-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.mode-switcher {
  display: flex;
  gap: 6px;
  padding: 6px;
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 320px;
}

.mode-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.mode-btn.active {
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.2), rgba(0, 255, 136, 0.08));
  border-color: rgba(0, 255, 136, 0.4);
  color: var(--neon-green);
  box-shadow: 0 0 15px rgba(0, 255, 136, 0.15);
}

.mode-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  min-height: 20px;
}

/* --- Level Badge in HUD --- */
.level-badge {
  color: var(--gold);
  font-weight: 700;
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
  transition: all 0.3s ease;
}

.level-badge.pulse {
  animation: levelBadgePulse 0.8s ease-in-out 2;
}

@keyframes levelBadgePulse {
  0%, 100% {
    transform: scale(1);
    color: var(--gold);
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
  }
  50% {
    transform: scale(1.25);
    color: #fff;
    text-shadow: 0 0 25px rgba(255, 215, 0, 0.9), 0 0 35px var(--neon-green);
  }
}

.rules-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  width: 100%;
}

.rule {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.rule-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.2), rgba(0, 255, 136, 0.05));
  border: 1px solid rgba(0, 255, 136, 0.3);
  color: var(--neon-green);
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

/* --- Action Buttons Group --- */
.action-buttons-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
}

/* --- Install App Button (PWA) --- */
.btn-install {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 12px 28px;
  background: linear-gradient(135deg, rgba(0, 243, 255, 0.15), rgba(0, 243, 255, 0.05));
  border: 1.5px solid rgba(0, 243, 255, 0.4);
  border-radius: var(--radius-xl);
  color: var(--neon-cyan);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 0 20px rgba(0, 243, 255, 0.15);
}

.btn-install.visible {
  display: flex;
}

.btn-install:hover {
  background: linear-gradient(135deg, rgba(0, 243, 255, 0.3), rgba(0, 243, 255, 0.1));
  border-color: rgba(0, 243, 255, 0.7);
  box-shadow: 0 0 30px rgba(0, 243, 255, 0.3);
  transform: translateY(-2px) scale(1.02);
}

/* --- Primary Button --- */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--neon-green), var(--neon-green-dim));
  border: none;
  border-radius: var(--radius-xl);
  color: #0a0e27;
  font-family: var(--font-main);
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
  letter-spacing: 0.5px;
  text-decoration: none;
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 40px rgba(0, 255, 136, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.2), 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* --- Shopee Link Button --- */
.shopee-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 24px;
  background: linear-gradient(135deg, #ff5722, #ee4d2d);
  border: 1px solid rgba(255, 87, 34, 0.5);
  border-radius: var(--radius-xl);
  color: #ffffff;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 0 20px rgba(238, 77, 45, 0.3), 0 4px 12px rgba(0, 0, 0, 0.3);
}

.shopee-btn:hover {
  background: linear-gradient(135deg, #ff6b3d, #ff5722);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 25px rgba(238, 77, 45, 0.5), 0 6px 16px rgba(0, 0, 0, 0.4);
}

.shopee-btn:active {
  transform: translateY(0) scale(0.98);
}

.shopee-icon {
  font-size: 1.15rem;
}

/* --- Floating Shopee Corner Badge --- */
.floating-shopee {
  position: fixed;
  bottom: 24px;
  left: 24px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: linear-gradient(135deg, rgba(238, 77, 45, 0.85), rgba(255, 87, 34, 0.75));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 120, 80, 0.4);
  border-radius: var(--radius-xl);
  color: #ffffff;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  z-index: 90;
  box-shadow: 0 0 20px rgba(238, 77, 45, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
  transition: all var(--transition-fast);
  animation: shopeePulse 3s infinite ease-in-out;
}

.floating-shopee:hover {
  transform: translateY(-2px) scale(1.06);
  box-shadow: 0 0 30px rgba(238, 77, 45, 0.5), 0 6px 20px rgba(0, 0, 0, 0.4);
}

.floating-shopee:active {
  transform: scale(0.95);
}

@keyframes shopeePulse {
  0%, 100% { box-shadow: 0 0 15px rgba(238, 77, 45, 0.25); }
  50% { box-shadow: 0 0 28px rgba(238, 77, 45, 0.6); }
}

.btn-arrow {
  font-size: 1.3rem;
  transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-arrow {
  transform: translateX(4px);
}

/* --- Google Ads / Support Ad Slot Wrapper --- */
.ad-slot-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(0, 243, 255, 0.35);
  background: linear-gradient(135deg, rgba(0, 243, 255, 0.06), rgba(10, 14, 39, 0.7));
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  transition: all var(--transition-normal);
}

.ad-slot-wrapper:hover {
  border-color: rgba(0, 243, 255, 0.6);
  box-shadow: 0 0 20px rgba(0, 243, 255, 0.15);
}

.ad-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 6px;
}

.ad-tag {
  color: var(--neon-cyan);
  font-weight: 700;
  letter-spacing: 0.3px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.ad-subtitle {
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.ad-content-box {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.ad-placeholder-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  width: 100%;
}

.ad-placeholder-icon {
  font-size: 1.5rem;
  animation: adIconBob 2s infinite ease-in-out;
}

@keyframes adIconBob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px) scale(1.1); }
}

.ad-placeholder-text {
  font-size: 0.8rem;
  color: #cbd5e1;
  line-height: 1.35;
  margin: 0;
}

/* --- Taunting Ant Face --- */
.taunt-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  animation: tauntBounceIn 0.6s ease backwards 0.1s;
  cursor: pointer;
  padding: 8px;
  border-radius: 20px;
  transition: transform 0.2s ease;
}

.taunt-container:hover {
  transform: scale(1.05);
}

.taunt-container:active {
  transform: scale(0.95);
}

.taunt-container.taunt-pop .taunt-ant {
  animation: tauntCrazyWobble 0.4s ease-in-out infinite alternate;
}

.taunt-container.taunt-pop .taunt-tongue {
  animation: tauntTongueCrazy 0.2s ease-in-out infinite alternate;
}

@keyframes tauntCrazyWobble {
  0% { transform: rotate(-18deg) scale(1.1); }
  100% { transform: rotate(18deg) scale(1.1); }
}

@keyframes tauntTongueCrazy {
  0% { height: 20px; bottom: -15px; }
  100% { height: 35px; bottom: -28px; }
}

.taunt-ant {
  position: relative;
  width: 120px;
  height: 130px;
  animation: tauntWobble 0.6s ease-in-out infinite;
}

.taunt-head {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 90px;
  background: radial-gradient(ellipse at 40% 35%, #5a3a25, #2d1810);
  border-radius: 50% 50% 45% 45%;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4), inset 0 -4px 10px rgba(0,0,0,0.3);
}

.taunt-eye {
  position: absolute;
  top: 24px;
  width: 24px;
  height: 26px;
  background: #fff;
  border-radius: 50%;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
  overflow: hidden;
}

.taunt-eye.left { left: 18px; }
.taunt-eye.right { right: 18px; }

.taunt-pupil {
  position: absolute;
  bottom: 5px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 14px;
  background: #1a1a1a;
  border-radius: 50%;
  animation: tauntLookAround 2s ease-in-out infinite;
}

.taunt-pupil::after {
  content: '';
  position: absolute;
  top: 2px;
  right: 1px;
  width: 4px;
  height: 4px;
  background: #fff;
  border-radius: 50%;
}

.taunt-mouth {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 16px;
  background: #1a0808;
  border-radius: 0 0 50% 50%;
  overflow: visible;
}

.taunt-tongue {
  position: absolute;
  bottom: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 24px;
  background: linear-gradient(180deg, #ff6b8a, #ff4d6a);
  border-radius: 40% 40% 50% 50%;
  animation: tauntTongue 0.8s ease-in-out infinite;
  box-shadow: 0 2px 6px rgba(255, 77, 106, 0.3);
}

.taunt-tongue::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 10px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 2px;
}

.taunt-antenna {
  position: absolute;
  top: 0;
  width: 3px;
  height: 40px;
  background: #3d2b1f;
  border-radius: 2px;
  transform-origin: bottom center;
}

.taunt-antenna.left {
  left: 28px;
  transform: rotate(-25deg);
  animation: tauntAntennaLeft 0.8s ease-in-out infinite;
}

.taunt-antenna.right {
  right: 28px;
  transform: rotate(25deg);
  animation: tauntAntennaRight 0.8s ease-in-out infinite;
}

.taunt-antenna::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 7px;
  height: 7px;
  background: #3d2b1f;
  border-radius: 50%;
}

.taunt-text {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--gold);
  text-shadow: 0 0 20px rgba(255, 215, 0, 0.4);
  animation: tauntTextBounce 0.5s ease-in-out infinite alternate;
  letter-spacing: 2px;
}

@keyframes tauntWobble {
  0%, 100% { transform: rotate(-6deg); }
  50% { transform: rotate(6deg); }
}

@keyframes tauntTongue {
  0%, 100% { height: 24px; bottom: -18px; }
  50% { height: 30px; bottom: -24px; }
}

@keyframes tauntLookAround {
  0%, 100% { transform: translateX(-70%); }
  50% { transform: translateX(-30%); }
}

@keyframes tauntAntennaLeft {
  0%, 100% { transform: rotate(-25deg); }
  50% { transform: rotate(-40deg); }
}

@keyframes tauntAntennaRight {
  0%, 100% { transform: rotate(25deg); }
  50% { transform: rotate(40deg); }
}

@keyframes tauntBounceIn {
  0% { opacity: 0; transform: scale(0.3) translateY(30px); }
  50% { transform: scale(1.15) translateY(-5px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes tauntTextBounce {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(-4px) scale(1.05); }
}

.gameover-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--danger);
  text-shadow: 0 0 30px rgba(255, 77, 106, 0.3);
}

.score-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  border-radius: var(--radius-md);
  width: 100%;
}

.score-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.score-label {
  font-size: 1rem;
  color: var(--text-secondary);
}

.score-value {
  font-size: 1.2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.score-divider {
  height: 1px;
  background: var(--glass-border);
}

.score-row.highlight .score-value {
  color: var(--gold);
  text-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
}

.new-record {
  display: none;
  font-size: 0.8rem;
  color: var(--gold);
  font-weight: 600;
  animation: newRecordPulse 1s ease-in-out infinite;
}

.new-record.visible {
  display: inline;
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

@keyframes fabEntrance {
  from {
    opacity: 0;
    transform: scale(0.5) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes instructionPulse {
  0%, 100% { opacity: 0.7; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.05); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes antWalk {
  0%, 100% { transform: rotate(-5deg); }
  50% { transform: rotate(5deg); }
}

@keyframes escapeAnt {
  0% { transform: translateX(0) scale(1); opacity: 1; }
  50% { transform: translateX(30px) scale(1.2); opacity: 1; }
  100% { transform: translateX(0) scale(1); opacity: 1; }
}

@keyframes newRecordPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes screenShake {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-3px, -2px); }
  20% { transform: translate(3px, 2px); }
  30% { transform: translate(-2px, 3px); }
  40% { transform: translate(2px, -3px); }
  50% { transform: translate(-1px, 1px); }
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .title-text {
    font-size: 2.2rem;
  }

  .title-emoji {
    font-size: 2.5rem;
  }

  .overlay-content {
    padding: 28px 20px;
    gap: 20px;
  }

  .game-subtitle {
    font-size: 0.9rem;
  }

  .rules-box {
    padding: 16px 18px;
    gap: 10px;
  }

  .rule {
    font-size: 0.85rem;
  }

  .btn-primary {
    padding: 14px 32px;
    font-size: 1.05rem;
  }

  #hud {
    top: 12px;
    padding: 8px 18px;
    gap: 8px;
  }

  .hud-item {
    font-size: 0.95rem;
  }

  #add-ant-btn {
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    font-size: 0.9rem;
  }

  .instruction-icon {
    font-size: 2.5rem;
  }

  .instruction-text {
    font-size: 1.1rem;
  }

  .gameover-title {
    font-size: 1.6rem;
  }

  .gameover-emoji {
    font-size: 3rem;
  }

  .score-card {
    padding: 18px;
  }
}

@media (max-width: 380px) {
  .title-text {
    font-size: 1.8rem;
  }

  .overlay-content {
    padding: 20px 16px;
  }

  #add-ant-btn {
    bottom: 16px;
    right: 16px;
  }
}

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