/* ==========================================================================
   GAME HUD, OVERLAYS & HUD ELEMENTS - NEO-CYBERPUNK REDESIGN
   ========================================================================== */

:root {
  --cyber-blue: #00fbff;
  --cyber-blue-alt: #0088ff;
  --neon-pink: #ff0055;
  --neon-orange: #ff5e00;
  --neon-purple: #a0f;
  --dark-bg: rgba(2, 4, 8, 0.9);
  --panel-bg: rgba(0, 15, 30, 0.8);
  --z-game: 1;
  --z-hud: 100;
  --z-overlay: 50000;
  --cyber-font: "Orbitron", sans-serif;
}

/* ==========================================================================
   CONTAINERS
   ========================================================================== */

#game-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-game);
  overflow: hidden;
}

#game-container {
  position: relative;
  user-select: none;
  overflow: hidden;
  width: 100%;
  height: 100%;
  background: #020408;
  border: none;
  box-shadow: none;
  transition: all 0.3s ease;
  touch-action: none;
}

#game-container.fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 9999;
  border-radius: 0;
  border: none;
  margin: 0;
}

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

/* ==========================================================================
   HUD PANELS
   ========================================================================== */

.hud-panel {
  position: absolute;
  font-family: var(--cyber-font) !important;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  text-shadow: 0 0 8px currentColor;
  pointer-events: none;
  z-index: var(--z-hud) !important;
}

#debug-info {
  display: none;
  top: 80px;
  left: 15px;
  color: var(--cyber-blue);
  font-size: 0.7rem;
  text-align: left;
  z-index: 100;
  opacity: 0.7;
}

#game-ui {
  top: calc(15px + env(safe-area-inset-top));
  left: calc(2px + env(safe-area-inset-left));
  color: var(--cyber-blue) !important;
  font-size: 0.9rem !important;
  background: rgba(0, 20, 40, 0.7) !important;
  padding: 6px 18px !important;
  border-left: 3px solid var(--cyber-blue) !important;
  border-right: 1px solid rgba(0, 251, 255, 0.2) !important;
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%) !important;
  box-shadow: -5px 0 15px rgba(0, 251, 255, 0.2) !important;
  letter-spacing: 2px !important;
  font-weight: 900 !important;
  font-family: var(--cyber-font) !important;
}

#coin-ui {
  top: calc(65px + env(safe-area-inset-top));
  left: calc(2px + env(safe-area-inset-left));
  color: #ffd700 !important;
  font-size: 0.9rem !important;
  background: rgba(40, 30, 0, 0.6) !important;
  padding: 6px 18px !important;
  border-left: 3px solid #ffd700 !important;
  border-right: 1px solid rgba(255, 215, 0, 0.2) !important;
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%) !important;
  box-shadow: -5px 0 15px rgba(255, 215, 0, 0.2) !important;
  letter-spacing: 2px !important;
  font-weight: 900 !important;
  font-family: var(--cyber-font) !important;
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#high-score-ui {
  top: calc(115px + env(safe-area-inset-top));
  left: calc(2px + env(safe-area-inset-left));
  color: var(--neon-pink) !important;
  font-size: 0.85rem !important;
  background: rgba(40, 0, 20, 0.5) !important;
  padding: 4px 15px !important;
  border-left: 3px solid var(--neon-pink) !important;
  clip-path: polygon(0 0, 92% 0, 100% 100%, 0 100%) !important;
  text-shadow: 0 0 10px var(--neon-pink) !important;
  letter-spacing: 1px !important;
  font-family: var(--cyber-font) !important;
}

#dash-ui {
  bottom: calc(15px + env(safe-area-inset-bottom));
  left: calc(15px + env(safe-area-inset-left));
  color: var(--cyber-blue);
  font-size: 0.9rem;
  background: rgba(0, 0, 0, 0.4);
  padding: 3px 10px;
  border-left: 2px solid var(--cyber-blue);
}

#powerups-ui {
  bottom: calc(15px + env(safe-area-inset-bottom));
  right: calc(15px + env(safe-area-inset-right));
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

#combo-ui {
  position: absolute;
  top: 130px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 2rem;
  color: #fff;
  text-shadow: 0 0 10px var(--cyber-blue), 0 0 20px var(--cyber-blue);
  transition: transform 0.1s;
  display: none;
  font-style: italic;
  z-index: 20002;
}

.powerup-icon {
  display: inline-block;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  margin-right: 5px;
  box-shadow: 0 0 10px currentColor;
  background: rgba(0,0,0,0.5);
  border: 1px solid currentColor;
}

/* ==========================================================================
   HP & BOSS ELEMENTS
   ========================================================================== */

#player-hp-container {
  position: absolute;
  top: 55px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 20002 !important;
}

.hp-heart {
  width: 14px !important;
  height: 24px !important;
  background: linear-gradient(180deg, #ff0055, #ff5e00) !important;
  transform: skewX(-15deg) !important;
  box-shadow: 0 0 15px rgba(255, 0, 85, 0.6), inset 0 0 5px rgba(255, 255, 255, 0.5) !important;
  position: relative;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
  overflow: hidden;
  display: inline-block !important;
}

.hp-heart::before {
  content: '' !important;
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  width: 100% !important;
  height: 100% !important;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0, 0, 0, 0.3) 3px,
    rgba(0, 0, 0, 0.3) 4px
  ) !important;
}

.hp-lost { 
  opacity: 0.15 !important; 
  box-shadow: none !important; 
  background: rgba(255, 255, 255, 0.1) !important; 
  transform: skewX(-15deg) scale(0.9) !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
}

.hp-lost::before { 
  display: none !important; 
}

#boss-hp-container {
  position: absolute;
  top: 95px;
  left: 50%;
  transform: translateX(-50%);
  display: none;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  z-index: 20002;
}

#boss-hp-label {
  color: var(--neon-pink);
  font-family: var(--cyber-font);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 2px;
  text-shadow: 0 0 10px var(--neon-pink), 0 0 20px var(--neon-pink);
  white-space: nowrap;
  animation: pulse-boss 1.5s ease-in-out infinite;
}

@keyframes pulse-boss {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

#boss-hp-bar {
  position: relative;
  width: 300px;
  max-width: 65vw;
  height: 8px;
  background: rgba(255, 0, 85, 0.1);
  border: 1px solid var(--neon-pink);
  box-shadow: 0 0 15px rgba(255, 0, 85, 0.4);
  clip-path: polygon(2% 0, 100% 0, 98% 100%, 0 100%);
}

#boss-hp-fill {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #ff0055, #ff5e00, #ff0);
  box-shadow: 0 0 20px #ff0055, 0 0 30px rgba(255, 0, 85, 0.6);
  transition: width 0.3s ease-out;
  position: relative;
}

#boss-hp-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 8px,
    rgba(0, 0, 0, 0.3) 8px,
    rgba(0, 0, 0, 0.3) 10px
  );
}


/* ==========================================================================
   XP BAR
   ========================================================================== */

#xp-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 12px !important;
  background: rgba(0, 0, 0, 0.9) !important;
  z-index: 1000 !important;
  overflow: hidden;
  border-bottom: 2px solid var(--cyber-blue) !important;
  box-shadow: 0 0 15px rgba(0, 251, 255, 0.4) !important;
}

#xp-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyber-blue), var(--neon-pink)) !important;
  box-shadow: 0 0 20px var(--cyber-blue) !important;
  transition: width 0.6s cubic-bezier(0.23, 1, 0.32, 1);
  position: relative;
}

#xp-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 18px,
    rgba(0, 0, 0, 0.5) 18px,
    rgba(0, 0, 0, 0.5) 20px
  ) !important;
  z-index: 2;
}

#level-indicator {
  position: absolute;
  top: 15px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff !important;
  font-size: 0.8rem !important;
  font-family: var(--cyber-font) !important;
  font-weight: 900 !important;
  z-index: 1001 !important;
  letter-spacing: 2.5px !important;
  text-shadow: 0 0 10px var(--cyber-blue) !important;
  background: rgba(0, 10, 20, 0.95) !important;
  padding: 5px 16px !important;
  border: 1px solid var(--cyber-blue) !important;
  clip-path: polygon(15% 0, 100% 0, 85% 100%, 0 100%) !important;
  box-shadow: 0 0 15px rgba(0, 251, 255, 0.3) !important;
}


/* ==========================================================================
   MOBILE CONTROLS
   ========================================================================== */

#mobile-controls {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: var(--z-hud);
}

body.paused #mobile-controls,
body.game-over #mobile-controls {
  display: none !important;
}

.control-zone {
  pointer-events: auto;
  position: absolute;
  touch-action: none;
}

#joystick-zone {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50%;
  height: 50%;
  z-index: 21;
}

#joystick-visual {
  position: absolute;
  width: 140px;
  height: 140px;
  border: 2px dashed rgba(0, 251, 255, 0.15);
  background: rgba(0, 251, 255, 0.02);
  border-radius: 50%;
  pointer-events: none;
  display: flex;
  transform: translate(-50%, -50%);
  backdrop-filter: blur(2px);
  opacity: 0.4;
  bottom: calc(80px + env(safe-area-inset-bottom));
  left: calc(80px + env(safe-area-inset-left));
}

#joystick-visual.active {
  opacity: 1;
  border-color: rgba(0, 251, 255, 0.3);
  background: rgba(0, 251, 255, 0.05);
}

#joystick-knob {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 55px;
  height: 55px;
  background: var(--cyber-blue);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 20px var(--cyber-blue);
  opacity: 0.8;
}

#mobile-dash-btn {
  position: absolute;
  bottom: calc(50px + env(safe-area-inset-bottom));
  right: calc(40px + env(safe-area-inset-right));
  width: 100px;
  height: 100px;
  background: rgba(0, 251, 255, 0.05);
  border: 2px solid var(--cyber-blue);
  border-radius: 50%;
  color: var(--cyber-blue);
  font-weight: 900;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: var(--cyber-font);
  font-size: 1.2rem;
  box-shadow: inset 0 0 15px rgba(0, 251, 255, 0.2), 0 0 10px rgba(0, 251, 255, 0.1);
  text-shadow: 0 0 5px var(--cyber-blue);
  backdrop-filter: blur(5px);
  pointer-events: auto;
}

#mobile-overdrive-btn {
  position: absolute;
  bottom: calc(150px + env(safe-area-inset-bottom));
  right: calc(50px + env(safe-area-inset-right));
  width: 80px;
  height: 80px;
  background: rgba(255, 0, 255, 0.05);
  border: 2px solid var(--neon-pink);
  border-radius: 50%;
  color: var(--neon-pink);
  font-weight: 900;
  display: none;
  justify-content: center;
  align-items: center;
  font-family: var(--cyber-font);
  font-size: 0.85rem;
  box-shadow: inset 0 0 12px rgba(255, 0, 255, 0.2);
  text-shadow: 0 0 5px var(--neon-pink);
  backdrop-filter: blur(5px);
  pointer-events: auto;
}

/* ==========================================================================
   OVERDRIVE BAR (COMPACT, RIGHT SIDE)
   ========================================================================== */

#overdrive-bar {
  position: fixed;
  top: 50%;
  right: calc(18px + env(safe-area-inset-right));
  width: 16px;
  height: 140px;
  max-height: 40vh;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.6);
  border: 2px solid var(--neon-pink);
  border-radius: 8px;
  overflow: hidden;
  z-index: var(--z-hud);
  pointer-events: none;
  box-shadow: 0 0 15px rgba(255, 0, 255, 0.3), inset 0 0 10px rgba(0, 0, 0, 0.8);
}

#overdrive-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(0deg, #f0f, #ff0080);
  box-shadow: 0 0 20px #f0f;
  transition: height 0.2s ease-out;
  border-radius: 6px;
}

#overdrive-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-90deg);
  font-size: 0.5rem;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 1px;
  font-family: var(--cyber-font);
  text-shadow: 0 0 5px rgba(255, 0, 255, 0.5);
  pointer-events: none;
  white-space: nowrap;
}

#overdrive-ready {
  position: fixed;
  top: calc(50% + 85px);
  right: calc(8px + env(safe-area-inset-right));
  color: var(--neon-pink);
  font-size: 0.6rem;
  font-weight: 900;
  font-family: var(--cyber-font);
  letter-spacing: 1px;
  text-shadow: 0 0 10px var(--neon-pink);
  display: none;
  z-index: var(--z-hud);
  pointer-events: none;
  animation: pulse-glow 1s ease-in-out infinite;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; text-shadow: 0 0 10px var(--neon-pink), 0 0 20px var(--neon-pink); }
  50% { opacity: 0.7; text-shadow: 0 0 5px var(--neon-pink); }
}

/* ==========================================================================
   UPGRADE MODAL
   ========================================================================== */

#upgrade-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 10, 20, 0.94);
  z-index: 55000 !important;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  backdrop-filter: blur(15px);
  border: none;
  padding: 20px;
  box-sizing: border-box;
}

#upgrade-modal::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, transparent 0%, rgba(0, 251, 255, 0.05) 100%);
  pointer-events: none;
}

.upgrade-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 300px;
  justify-content: center;
  margin: 15px auto 0 auto;
  padding: 10px;
}

.upgrade-card {
  width: 100%;
  min-height: 75px;
  background: rgba(0, 15, 30, 0.85);
  border: 2px solid var(--cyber-blue);
  border-radius: 5px;
  padding: 12px 15px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 15px rgba(0, 251, 255, 0.1);
}

.upgrade-card::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--cyber-blue);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.upgrade-card:hover {
  transform: translateY(-10px) scale(1.02);
  background: rgba(0, 40, 70, 0.95);
  border-color: #fff;
  box-shadow: 0 0 30px rgba(0, 251, 255, 0.4);
}

.upgrade-card:hover::before {
  transform: scaleX(1);
}

.upgrade-card .card-icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
  filter: drop-shadow(0 0 10px currentColor);
}

.upgrade-card .card-title,
.card-title {
  color: var(--cyber-blue);
  font-family: var(--cyber-font);
  font-size: 0.75rem;
  font-weight: bold;
  margin-bottom: 5px;
  letter-spacing: 1px;
  text-shadow: 0 0 8px rgba(0, 251, 255, 0.4);
}

.upgrade-card .card-desc,
.card-desc {
  color: #b0c4de;
  font-size: 0.7rem;
  line-height: 1.5;
  margin-bottom: 5px;
  flex-grow: 1;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.upgrade-card .card-rarity,
.card-rarity {
  margin-top: auto;
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 900;
}

.rarity-common { 
  color: #888; 
  border-top: 1px solid rgba(255,255,255,0.1); 
  width: 100%; 
  padding-top: 8px; 
}

.rarity-rare { 
  color: var(--cyber-blue); 
  border-top: 1px solid var(--cyber-blue); 
  width: 100%; 
  padding-top: 8px; 
}

.rarity-epic {
  color: #a855f7;
  border-top: 1px solid #a855f7;
  width: 100%;
  padding-top: 8px;
  text-shadow: 0 0 8px #a855f7;
}

.rarity-legendary { 
  color: #fa0; 
  border-top: 1px solid #fa0; 
  width: 100%; 
  padding-top: 8px; 
  text-shadow: 0 0 8px #fa0; 
}

/* ==========================================================================
   SCREENS (GAME OVER / PAUSE / START)
   ========================================================================== */

#game-over {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, rgba(15, 0, 5, 0.98) 0%, rgba(5, 0, 0, 1) 100%);
  z-index: 55000;
  backdrop-filter: blur(20px);
  text-align: center;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  box-sizing: border-box;
  overflow-y: auto;
  gap: 20px;
}

#game-over::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(0deg, rgba(255, 0, 85, 0.03) 0px, transparent 1px, transparent 2px);
  pointer-events: none;
  z-index: 1;
}

#game-over .cyber-panel {
  background: rgba(0, 0, 0, 0.8) !important;
  border: 1px solid var(--neon-pink) !important;
  box-shadow: 0 0 40px rgba(255, 0, 85, 0.2), inset 0 0 20px rgba(255, 0, 85, 0.1) !important;
  padding: 40px !important;
  max-width: 450px;
  width: 90%;
  position: relative;
  z-index: 2;
  overflow: visible;
}

#game-over .overlay-title {
  margin: 0 0 10px 0;
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  letter-spacing: 4px;
  text-transform: uppercase;
  animation: glitch-text 2s infinite;
}

.overlay-score-panel {
  background: rgba(0, 251, 255, 0.05);
  border-left: 4px solid var(--cyber-blue);
  padding: 15px;
  margin: 20px 0;
  text-align: left;
  font-family: var(--cyber-font);
}

.overlay-score-label {
  color: var(--cyber-blue);
  font-size: 0.75rem;
  letter-spacing: 2px;
  margin-bottom: 5px;
  opacity: 0.8;
}

.overlay-score-value {
  color: #fff;
  font-size: 2rem;
  font-weight: 900;
  text-shadow: 0 0 10px var(--cyber-blue);
}

@keyframes glitch-text {
  0% { transform: translate(0); text-shadow: 2px 0 var(--cyber-blue), -2px 0 var(--neon-pink); }
  2% { transform: translate(-2px, 1px); }
  4% { transform: translate(2px, -1px); }
  6% { transform: translate(0); }
  100% { transform: translate(0); }
}

.pulse-glow {
  animation: pulse-glow-anim 1s infinite alternate;
}

@keyframes pulse-glow-anim {
  from { text-shadow: 0 0 5px #ffd700, 0 0 10px #ffd700; transform: scale(1); }
  to { text-shadow: 0 0 20px #ffd700, 0 0 30px #ffd700; transform: scale(1.05); }
}

#game-over .cyber-btn {
  margin: 0;
  font-family: var(--cyber-font);
  font-size: 0.8rem;
  clip-path: polygon(10% 0, 100% 0, 90% 100%, 0 100%);
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.3s ease;
}

#pause-screen {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 5, 15, 0.85);
  z-index: 55000;
  backdrop-filter: blur(8px);
}

.overlay-title {
  color: #fff;
  font-family: var(--cyber-font);
  letter-spacing: clamp(1.5px, 0.5vw, 2.5px);
  font-weight: 900;
  margin-bottom: 10px;
  text-shadow: 0 0 20px rgba(255,255,255,0.5);
  margin-top: 0;
  font-size: clamp(1.1rem, 4vw, 1.5rem);
  line-height: 1.2;
  max-width: 90%;
}

.overlay-score {
  color: var(--cyber-blue);
  margin-bottom: 10px;
  font-family: var(--cyber-font);
  font-size: clamp(0.8rem, 3vw, 1rem);
  text-shadow: 0 0 10px var(--cyber-blue);
  line-height: 1.3;
}

/* ==========================================================================
   FLOATING TEXT (DAMAGE NUMBERS)
   ========================================================================== */

.floating-text {
  position: absolute;
  font-family: var(--cyber-font);
  font-weight: 900;
  font-size: 1.5rem;
  color: #fff;
  text-shadow: 0 0 10px currentColor;
  pointer-events: none;
  z-index: 10000;
  animation: float-up 1s ease-out forwards;
}

@keyframes float-up {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-50px);
  }
}

/* ==========================================================================
   OVERLAY BUTTONS (GAME OVER / PAUSE)
   ========================================================================== */

.overlay-btn {
  padding: clamp(10px, 2.5vw, 14px) clamp(20px, 5vw, 35px);
  font-family: var(--cyber-font);
  font-size: clamp(0.75rem, 2.5vw, 0.95rem);
  font-weight: 900;
  letter-spacing: clamp(1px, 0.3vw, 1.8px);
  text-transform: uppercase;
  border: 2px solid var(--cyber-blue);
  background: rgba(0, 251, 255, 0.1);
  color: var(--cyber-blue);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 0 0 20px rgba(0, 251, 255, 0.2), inset 0 0 10px rgba(0, 251, 255, 0.05);
  text-shadow: 0 0 8px var(--cyber-blue);
  border-radius: 5px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  min-width: clamp(140px, 35vw, 200px);
  white-space: nowrap;
}

.overlay-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.overlay-btn:hover {
  transform: translateY(-3px) scale(1.05);
  background: rgba(0, 251, 255, 0.25);
  box-shadow: 0 0 30px rgba(0, 251, 255, 0.5), inset 0 0 20px rgba(0, 251, 255, 0.1);
  border-color: #fff;
}

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

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

.overlay-btn.primary {
  border-color: var(--cyber-blue);
  color: var(--cyber-blue);
  background: rgba(0, 251, 255, 0.15);
}

.overlay-btn.primary:hover {
  background: rgba(0, 251, 255, 0.3);
  border-color: #fff;
}

.overlay-btn.danger {
  border-color: var(--neon-pink);
  color: var(--neon-pink);
  background: rgba(255, 0, 85, 0.1);
  text-shadow: 0 0 8px var(--neon-pink);
  box-shadow: 0 0 20px rgba(255, 0, 85, 0.2), inset 0 0 10px rgba(255, 0, 85, 0.05);
}

.overlay-btn.danger:hover {
  background: rgba(255, 0, 85, 0.25);
  border-color: #ff5599;
  box-shadow: 0 0 30px rgba(255, 0, 85, 0.5), inset 0 0 20px rgba(255, 0, 85, 0.1);
}

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

@media (max-width: 768px) {
  
  #game-ui { 
    font-size: 1rem; 
  }
  
  .overlay-title { 
    font-size: 1.8rem; 
  }
  
  body.game-active { 
    overflow: hidden; 
  }
  
  .upgrade-cards {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .upgrade-card {
  }
  
  #mobile-dash-btn {
    width: 85px;
    height: 85px;
    font-size: 1rem;
  }
  
  #mobile-overdrive-btn {
    width: 70px;
    height: 70px;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  #game-over {
    padding: calc(15px + env(safe-area-inset-top)) calc(10px + env(safe-area-inset-right)) calc(15px + env(safe-area-inset-bottom)) calc(10px + env(safe-area-inset-left));
    gap: 8px;
  }
  
  #game-over::before {
    font-size: 1.8rem;
    letter-spacing: 2px;
    top: 5%;
  }
  
  .overlay-title {
    font-size: 1.2rem;
    margin-bottom: 8px;
    letter-spacing: 1.5px;
  }
  
  .overlay-score {
    font-size: 0.85rem;
    margin-bottom: 8px;
  }
  
  .overlay-btn {
    padding: 9px 18px;
    font-size: 0.75rem;
    min-width: 120px;
    letter-spacing: 1px;
  }
}