/* 
 * NEON SLINGER: HYPER DASH - Stylesheet v3 (Overlord Update)
 * Cyberpunk Synthwave Aesthetics. Glassmorphism, CRT overlay, high-impact neon.
 */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Space+Grotesk:wght@400;600;700&display=swap');

:root {
  --neon-cyan: #00f3ff;
  --neon-pink: #ff0055;
  --neon-green: #39ff14;
  --neon-yellow: #ffe600;
  --neon-purple: #b026ff;
  --neon-red: #ff003c;
  --bg-dark: #020205;
  --panel-bg: rgba(6, 6, 18, 0.78);
  --border-glow: rgba(0, 243, 255, 0.3);
}

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

body {
  background-color: var(--bg-dark);
  color: #ffffff;
  font-family: 'Space Grotesk', sans-serif;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
}

/* CRT Screen Effect Overlay */
.crt-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  pointer-events: none;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.22) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.05), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.05));
  background-size: 100% 4px, 6px 100%;
}

.crt-overlay::after {
  content: " ";
  display: block;
  position: absolute;
  top: 0; left: 0; bottom: 0; right: 0;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.15) 50%);
  background-size: 100% 3px;
  z-index: 101;
  opacity: 0.5;
  pointer-events: none;
  animation: scanline 12s linear infinite;
}

@keyframes scanline {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

/* Main Container */
#game-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  max-width: 1280px;
  max-height: 800px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 0 40px rgba(0, 243, 255, 0.15), inset 0 0 20px rgba(0, 243, 255, 0.05);
  border: 1px solid rgba(0, 243, 255, 0.2);
  background: radial-gradient(circle at center, #070614 0%, #010103 100%);
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Canvas */
canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
}

/* Glassmorphic Panel Base */
.glass-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 40px 0 rgba(0, 0, 0, 0.65);
  border-radius: 16px;
  padding: 30px;
  text-align: center;
  transition: all 0.3s ease;
  z-index: 10;
}

/* Title Screen */
#menu-screen {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 20;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(2, 2, 5, 0.88);
  transition: opacity 0.5s ease;
}

.title-glow {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 4.5rem;
  letter-spacing: 6px;
  text-transform: uppercase;
  margin-bottom: 2px;
  color: #fff;
  text-shadow: 
    0 0 10px rgba(0, 243, 255, 0.6),
    0 0 20px rgba(0, 243, 255, 0.4),
    0 0 35px rgba(0, 243, 255, 0.2);
  animation: titlePulse 2s infinite alternate;
}

.subtitle-glow {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.6rem;
  color: var(--neon-pink);
  letter-spacing: 12px;
  text-transform: uppercase;
  margin-bottom: 35px;
  font-weight: 700;
  text-shadow: 0 0 10px rgba(255, 0, 85, 0.6);
}

@keyframes titlePulse {
  0% {
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.6), 0 0 20px rgba(0, 243, 255, 0.4), 0 0 30px rgba(0, 243, 255, 0.2);
    transform: scale(1);
  }
  100% {
    text-shadow: 0 0 20px rgba(0, 243, 255, 0.9), 0 0 35px rgba(0, 243, 255, 0.6), 0 0 55px rgba(0, 243, 255, 0.3);
    transform: scale(1.02);
  }
}

/* Button UI */
.btn-primary {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 1.25rem;
  color: #fff;
  background: linear-gradient(135deg, var(--neon-cyan) 0%, rgba(0, 243, 255, 0.35) 100%);
  border: 1px solid var(--neon-cyan);
  padding: 16px 45px;
  border-radius: 50px;
  cursor: pointer;
  box-shadow: 0 0 15px rgba(0, 243, 255, 0.3);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 0 30px rgba(0, 243, 255, 0.6), inset 0 0 10px rgba(255,255,255,0.4);
}

.btn-primary:active {
  transform: translateY(1px) scale(0.98);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.35), transparent);
  transition: 0.5s;
}

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

.instructions {
  margin-top: 25px;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.88rem;
  line-height: 1.5;
  max-width: 520px;
  text-align: center;
  padding: 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.instructions strong {
  color: var(--neon-cyan);
}

.instructions span {
  color: var(--neon-pink);
}

/* Gameplay Heads-Up Display (HUD) */
#hud-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.hud-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 15px;
}

.hud-group {
  display: flex;
  flex-direction: column;
}

.hud-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 2px;
}

.hud-value-orbitron {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 1.8rem;
  color: #fff;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.15);
}

/* Progress Bars */
.bar-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bar-wrapper {
  width: 130px;
  height: 12px;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 0 6px rgba(0,0,0,0.8);
}

.bar-fill {
  height: 100%;
  width: 100%;
  transition: width 0.12s ease-out;
}

#shield-bar-fill {
  background: linear-gradient(90deg, var(--neon-pink) 0%, #ff4b80 100%);
  box-shadow: 0 0 10px rgba(255, 0, 85, 0.5);
}

#shield-bar-fill.warning {
  background: linear-gradient(90deg, var(--neon-yellow) 0%, #ffcc00 100%);
  box-shadow: 0 0 10px rgba(255, 230, 0, 0.5);
  animation: barWarning 0.4s infinite alternate;
}

@keyframes barWarning {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

#energy-bar-fill {
  background: linear-gradient(90deg, var(--neon-cyan) 0%, #4ae6ff 100%);
  box-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
}

#xp-bar-fill {
  background: linear-gradient(90deg, var(--neon-green) 0%, #8cff4a 100%);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.5);
}

#bomb-bar-fill {
  background: linear-gradient(90deg, #b026ff 0%, #e066ff 100%);
  box-shadow: 0 0 10px rgba(176, 38, 255, 0.5);
}

#bomb-bar-fill.ready {
  background: linear-gradient(90deg, var(--neon-yellow) 0%, #ffb700 100%);
  box-shadow: 0 0 15px rgba(255, 230, 0, 0.7);
  animation: bombReadyPulse 0.6s infinite alternate;
}

@keyframes bombReadyPulse {
  0% { filter: brightness(1); }
  100% { filter: brightness(1.3); }
}

/* Floating Combo Counter */
#combo-container {
  position: absolute;
  right: 20px;
  top: 90px;
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  pointer-events: none;
  opacity: 0;
  transform: scale(0.8);
  transition: all 0.12s cubic-bezier(0.175, 0.885, 0.32, 1.25);
}

#combo-container.active {
  opacity: 1;
  transform: scale(1);
}

.combo-count {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 3.5rem;
  line-height: 0.9;
  background: linear-gradient(to bottom, #fff 25%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 8px rgba(0, 243, 255, 0.45));
}

.combo-text {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 3px;
  color: var(--neon-pink);
  text-shadow: 0 0 5px rgba(255, 0, 85, 0.45);
  margin-top: -3px;
}

/* Bomb Ready Cue HUD Overlay */
#bomb-alert-hint {
  position: absolute;
  bottom: 25px;
  left: 50%;
  transform: translateX(-50%) scale(0.8);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.95rem;
  font-weight: 900;
  color: var(--neon-yellow);
  background: rgba(0, 0, 0, 0.75);
  border: 1px solid var(--neon-yellow);
  padding: 8px 25px;
  border-radius: 5px;
  text-shadow: 0 0 6px rgba(255, 230, 0, 0.5);
  box-shadow: 0 0 15px rgba(255, 230, 0, 0.2);
  letter-spacing: 2px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.3);
}

#bomb-alert-hint.active {
  opacity: 1;
  transform: translateX(-50%) scale(1);
  animation: bombHintPulsate 0.8s infinite alternate;
}

@keyframes bombHintPulsate {
  0% { box-shadow: 0 0 8px rgba(255, 230, 0, 0.2); border-color: rgba(255, 230, 0, 0.6); }
  100% { box-shadow: 0 0 20px rgba(255, 230, 0, 0.5); border-color: rgba(255, 230, 0, 1); }
}

/* ==========================================
 * BOSS HP HUD BAR
 * ========================================== */
#boss-hud {
  position: absolute;
  top: 90px;
  left: 50%;
  transform: translateX(-50%);
  width: 380px;
  display: none; /* controlled via js */
  flex-direction: column;
  align-items: center;
  z-index: 15;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s ease-out;
}

.boss-name {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.9rem;
  font-weight: 900;
  letter-spacing: 4px;
  color: var(--neon-red);
  text-shadow: 0 0 6px rgba(255, 0, 60, 0.5);
  margin-bottom: 5px;
}

.boss-bar-wrapper {
  width: 100%;
  height: 16px;
  background: rgba(0, 0, 0, 0.75);
  border: 1px solid var(--neon-red);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: inset 0 0 8px rgba(0,0,0,0.9), 0 0 15px rgba(255, 0, 60, 0.25);
}

.boss-bar-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--neon-red) 0%, #ff5277 100%);
  box-shadow: 0 0 12px rgba(255, 0, 60, 0.7);
  transition: width 0.15s ease-out;
}

/* ==========================================
 * BOSS WARNING SIREN OVERLAY
 * ========================================== */
#boss-warning-overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 22;
  display: none; /* flex when active */
  flex-direction: column;
  justify-content: center;
  align-items: center;
  pointer-events: none;
  background: rgba(255, 0, 60, 0);
  animation: sirenAlert 0.4s infinite alternate;
}

@keyframes sirenAlert {
  0% { background: rgba(255, 0, 60, 0); }
  100% { background: rgba(255, 0, 60, 0.16); }
}

#boss-warning-overlay.warning-leviathan {
  animation: sirenAlertLeviathan 0.4s infinite alternate;
}

@keyframes sirenAlertLeviathan {
  0% { background: rgba(57, 255, 20, 0); }
  100% { background: rgba(57, 255, 20, 0.12); }
}

#boss-warning-overlay.warning-vortex {
  animation: sirenAlertVortex 0.4s infinite alternate;
}

@keyframes sirenAlertVortex {
  0% { background: rgba(176, 38, 255, 0); }
  100% { background: rgba(176, 38, 255, 0.14); }
}

.boss-warning-box {
  background: rgba(2, 2, 5, 0.9);
  border-top: 3px solid var(--neon-red);
  border-bottom: 3px solid var(--neon-red);
  width: 100%;
  padding: 40px 0;
  text-align: center;
  box-shadow: 0 0 30px rgba(255, 0, 60, 0.4);
}

#boss-warning-overlay.warning-leviathan .boss-warning-box {
  border-top: 3px solid var(--neon-green);
  border-bottom: 3px solid var(--neon-green);
  box-shadow: 0 0 30px rgba(57, 255, 20, 0.4);
}

#boss-warning-overlay.warning-vortex .boss-warning-box {
  border-top: 3px solid var(--neon-purple);
  border-bottom: 3px solid var(--neon-purple);
  box-shadow: 0 0 30px rgba(176, 38, 255, 0.4);
}

#boss-warning-overlay.warning-centipede {
  animation: sirenAlertCentipede 0.4s infinite alternate;
}

@keyframes sirenAlertCentipede {
  0% { background: rgba(255, 230, 0, 0); }
  100% { background: rgba(255, 230, 0, 0.12); }
}

#boss-warning-overlay.warning-centipede .boss-warning-box {
  border-top: 3px solid var(--neon-yellow);
  border-bottom: 3px solid var(--neon-yellow);
  box-shadow: 0 0 30px rgba(255, 230, 0, 0.4);
}

#boss-warning-overlay.warning-kraken {
  animation: sirenAlertKraken 0.4s infinite alternate;
}

@keyframes sirenAlertKraken {
  0% { background: rgba(176, 38, 255, 0); }
  100% { background: rgba(176, 38, 255, 0.12); }
}

#boss-warning-overlay.warning-kraken .boss-warning-box {
  border-top: 3px solid var(--neon-purple);
  border-bottom: 3px solid var(--neon-purple);
  box-shadow: 0 0 30px rgba(176, 38, 255, 0.4);
}

.boss-warning-text {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: 8px;
  color: var(--neon-red);
  text-shadow: 0 0 20px rgba(255, 0, 60, 0.8);
  animation: warningPulse 0.4s infinite alternate, textGlitch 1s infinite steps(2);
}

#boss-warning-overlay.warning-leviathan .boss-warning-text {
  color: var(--neon-green);
  text-shadow: 0 0 20px rgba(57, 255, 20, 0.8);
}

#boss-warning-overlay.warning-vortex .boss-warning-text {
  color: var(--neon-purple);
  text-shadow: 0 0 20px rgba(176, 38, 255, 0.8);
}

#boss-warning-overlay.warning-centipede .boss-warning-text {
  color: var(--neon-yellow);
  text-shadow: 0 0 20px rgba(255, 230, 0, 0.8);
}

#boss-warning-overlay.warning-kraken .boss-warning-text {
  color: var(--neon-purple);
  text-shadow: 0 0 20px rgba(176, 38, 255, 0.8);
}

@keyframes warningPulse {
  0% { transform: scale(0.96); filter: brightness(1); }
  100% { transform: scale(1.02); filter: brightness(1.3); }
}

.boss-warning-subtext {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-top: 8px;
}

/* LEVEL UP OVERLAY SELECTION MODAL */
#level-up-screen {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 25;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(2, 2, 6, 0.86);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
}

.level-up-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--neon-green);
  text-shadow: 0 0 15px rgba(57, 255, 20, 0.5);
  letter-spacing: 8px;
  text-transform: uppercase;
  margin-bottom: 5px;
  animation: titlePulse 2s infinite alternate;
}

.level-up-subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 40px;
  letter-spacing: 2px;
}

.card-container {
  display: flex;
  gap: 20px;
  justify-content: center;
  width: 90%;
  max-width: 900px;
}

.upgrade-card {
  flex: 1;
  background: rgba(12, 12, 28, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 25px 20px;
  cursor: pointer;
  text-align: center;
  transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.upgrade-card:hover {
  transform: translateY(-8px) scale(1.03);
  background: rgba(20, 20, 48, 0.85);
  box-shadow: 0 12px 30px rgba(0, 243, 255, 0.15);
}

.upgrade-card.cyan:hover { border-color: var(--neon-cyan); box-shadow: 0 0 25px rgba(0, 243, 255, 0.3); }
.upgrade-card.pink:hover { border-color: var(--neon-pink); box-shadow: 0 0 25px rgba(255, 0, 85, 0.3); }
.upgrade-card.green:hover { border-color: var(--neon-green); box-shadow: 0 0 25px rgba(57, 255, 20, 0.3); }
.upgrade-card.yellow:hover { border-color: var(--neon-yellow); box-shadow: 0 0 25px rgba(255, 230, 0, 0.3); }
.upgrade-card.purple:hover { border-color: var(--neon-purple); box-shadow: 0 0 25px rgba(176, 38, 255, 0.3); }

.card-icon {
  font-size: 2.2rem;
  margin-bottom: 15px;
  filter: drop-shadow(0 0 8px currentColor);
}

.card-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #ffffff;
  letter-spacing: 1px;
}

.card-level {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding: 2px 10px;
  border-radius: 4px;
  letter-spacing: 1px;
  border: 1px solid transparent;
}

.upgrade-card.cyan .card-level { color: var(--neon-cyan); background: rgba(0, 243, 255, 0.08); border-color: rgba(0, 243, 255, 0.25); text-shadow: 0 0 6px rgba(0, 243, 255, 0.4); }
.upgrade-card.pink .card-level { color: var(--neon-pink); background: rgba(255, 0, 85, 0.08); border-color: rgba(255, 0, 85, 0.25); text-shadow: 0 0 6px rgba(255, 0, 85, 0.4); }
.upgrade-card.green .card-level { color: var(--neon-green); background: rgba(57, 255, 20, 0.08); border-color: rgba(57, 255, 20, 0.25); text-shadow: 0 0 6px rgba(57, 255, 20, 0.4); }
.upgrade-card.yellow .card-level { color: var(--neon-yellow); background: rgba(255, 230, 0, 0.08); border-color: rgba(255, 230, 0, 0.25); text-shadow: 0 0 6px rgba(255, 230, 0, 0.4); }
.upgrade-card.purple .card-level { color: var(--neon-purple); background: rgba(176, 38, 255, 0.08); border-color: rgba(176, 38, 255, 0.25); text-shadow: 0 0 6px rgba(176, 38, 255, 0.4); }

.card-desc {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.45;
}

/* Fever Alert Mode Border */
#fever-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  border: 0px solid var(--neon-pink);
  z-index: 5;
  transition: border-width 0.2s ease, box-shadow 0.2s ease;
}

#fever-overlay.fever-active {
  border-width: 6px;
  box-shadow: inset 0 0 30px rgba(255, 0, 85, 0.25);
  animation: borderFlash 0.35s infinite alternate;
}

@keyframes borderFlash {
  0% { border-color: var(--neon-pink); box-shadow: inset 0 0 20px rgba(255, 0, 85, 0.2); }
  100% { border-color: var(--neon-yellow); box-shadow: inset 0 0 45px rgba(255, 230, 0, 0.35); }
}

/* Fever Splash Text */
#fever-splash {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  font-family: 'Orbitron', sans-serif;
  font-size: 5rem;
  font-weight: 900;
  letter-spacing: 12px;
  text-transform: uppercase;
  color: var(--neon-yellow);
  text-shadow: 0 0 20px rgba(255, 230, 0, 0.8), 0 0 40px rgba(255, 0, 85, 0.5);
  z-index: 12;
  pointer-events: none;
  opacity: 0;
  transition: all 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.4);
}

#fever-splash.splash-active {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  animation: glitch-text 0.18s 4 alternate;
}

@keyframes glitch-text {
  0% { transform: translate(-50%, -50%) skewX(0deg); color: var(--neon-yellow); }
  30% { transform: translate(-52%, -48%) skewX(-6deg); color: var(--neon-cyan); }
  60% { transform: translate(-48%, -52%) skewX(9deg); color: var(--neon-pink); }
  90% { transform: translate(-51%, -49%) skewX(-4deg); color: var(--neon-yellow); }
  100% { transform: translate(-50%, -50%) skewX(0deg); }
}

/* Flash Layers */
.screen-flash {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 102;
  opacity: 0;
}

.flash-hit {
  background: white;
  animation: flashAnim 0.08s ease-out;
}

.flash-damage {
  background: red;
  animation: flashAnim 0.18s ease-out;
}

@keyframes flashAnim {
  0% { opacity: 0.55; }
  100% { opacity: 0; }
}

/* Game Over Screen */
#game-over-screen {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 20;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(2, 2, 5, 0.9);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}

#game-over-screen.active {
  opacity: 1;
  pointer-events: auto;
}

.game-over-title {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 4.5rem;
  letter-spacing: 4px;
  color: var(--neon-pink);
  text-shadow: 0 0 15px rgba(255, 0, 85, 0.6);
  margin-bottom: 15px;
  animation: textGlitch 0.8s infinite steps(2);
}

@keyframes textGlitch {
  0% { transform: translate(0, 0); }
  20% { transform: translate(-3px, 2px); }
  40% { transform: translate(3px, -2px); }
  60% { transform: translate(-1px, -2px); }
  80% { transform: translate(2px, 2px); }
  100% { transform: translate(0, 0); }
}

.score-summary {
  display: flex;
  gap: 30px;
  margin-bottom: 40px;
  font-family: 'Orbitron', sans-serif;
}

.summary-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 15px 30px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.summary-score {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--neon-cyan);
  text-shadow: 0 0 8px rgba(0, 243, 255, 0.35);
}

/* Audio Toggle Control */
.audio-toggle {
  position: absolute;
  bottom: 20px;
  right: 20px;
  z-index: 30;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 10px;
  border-radius: 50%;
  cursor: pointer;
  width: 42px;
  height: 42px;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.2s ease;
}

.audio-toggle:hover {
  background: rgba(0, 243, 255, 0.12);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 10px rgba(0, 243, 255, 0.25);
}

.audio-toggle svg {
  fill: #fff;
  width: 18px;
  height: 18px;
  transition: fill 0.2s ease;
}

.audio-toggle:hover svg {
  fill: var(--neon-cyan);
}

.audio-toggle.muted svg {
  fill: var(--neon-pink);
}

.audio-toggle.muted {
  border-color: var(--neon-pink);
}

#loader-msg {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.45);
  margin-top: 15px;
  font-family: 'Orbitron', sans-serif;
  letter-spacing: 2px;
}

/* Bullet-Time Matrix Vignette Overlay */
#matrix-vignette {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 6;
  box-shadow: inset 0 0 100px rgba(0, 243, 255, 0);
  transition: box-shadow 0.35s ease;
}

#matrix-vignette.active {
  box-shadow: inset 0 0 140px rgba(176, 38, 255, 0.35);
  background: radial-gradient(circle, rgba(6, 6, 24, 0) 50%, rgba(6, 6, 24, 0.5) 100%);
  animation: matrixVignettePulse 2.5s infinite alternate;
}

@keyframes matrixVignettePulse {
  0% { box-shadow: inset 0 0 120px rgba(176, 38, 255, 0.3); }
  100% { box-shadow: inset 0 0 160px rgba(0, 243, 255, 0.45); }
}

/* Premium Upgrade Cards glow enhancement */
.upgrade-card {
  position: relative;
  overflow: hidden;
}

.upgrade-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.upgrade-card:hover::after {
  opacity: 1;
}

/* Red-Alert screen strobe for Boss Overdrive */
#overdrive-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 7;
  background: rgba(255, 0, 60, 0);
  transition: background 0.5s ease;
}

#overdrive-overlay.active {
  animation: overdriveAlertStrobe 0.8s infinite alternate;
}

@keyframes overdriveAlertStrobe {
  0% { background: rgba(255, 0, 60, 0.02); box-shadow: inset 0 0 50px rgba(255, 0, 60, 0.1); }
  100% { background: rgba(255, 0, 60, 0.12); box-shadow: inset 0 0 100px rgba(255, 0, 60, 0.35); }
}

/* Responsive adjustments for mobile screens */
@media (max-width: 768px) {
  #menu-screen, #game-over-screen, #level-up-screen {
    justify-content: flex-start;
    overflow-y: auto;
    padding: 30px 15px;
  }

  .title-glow {
    font-size: 2.8rem;
    letter-spacing: 3px;
  }
  
  .subtitle-glow {
    font-size: 1.1rem;
    letter-spacing: 6px;
    margin-bottom: 20px;
  }
  
  .btn-primary {
    font-size: 1rem;
    padding: 12px 30px;
  }
  
  .instructions {
    margin-top: 15px;
    font-size: 0.75rem;
    max-width: 95%;
    padding: 8px;
  }
  
  .glass-panel {
    border-radius: 0px;
    width: 100%;
    max-height: 100%;
  }
  
  /* HUD scale down */
  .hud-top {
    flex-wrap: wrap;
    gap: 8px;
    justify-content: space-around;
  }
  
  .hud-group {
    align-items: center;
  }
  
  .hud-value-orbitron {
    font-size: 1.1rem;
  }
  
  .bar-wrapper {
    width: 80px;
    height: 10px;
  }
  
  #combo-container {
    top: 140px;
    right: 15px;
  }
  
  .combo-count {
    font-size: 2.2rem;
  }
  
  .combo-text {
    font-size: 0.75rem;
    letter-spacing: 1px;
  }
  
  #boss-hud {
    top: 140px;
    width: 260px;
  }
  
  .boss-name {
    font-size: 0.75rem;
    letter-spacing: 2px;
  }
  
  .boss-bar-wrapper {
    height: 12px;
  }
  
  .level-up-title {
    font-size: 2rem;
    letter-spacing: 3px;
  }
  
  .level-up-subtitle {
    font-size: 0.85rem;
    margin-bottom: 20px;
    text-align: center;
  }
  
  .card-container {
    flex-direction: column;
    gap: 12px;
    width: 95%;
    max-height: 60vh;
    overflow-y: auto;
  }
  
  .upgrade-card {
    padding: 12px 15px;
    flex-direction: row;
    align-items: center;
    text-align: left;
  }
  
  .card-icon {
    font-size: 1.6rem;
    margin-bottom: 0;
    margin-right: 15px;
  }
  
  .card-title {
    font-size: 0.95rem;
    margin-bottom: 2px;
  }
  
  .card-level {
    font-size: 0.7rem;
    margin-bottom: 0;
    margin-right: 10px;
    padding: 1px 6px;
  }
  
  .card-desc {
    font-size: 0.75rem;
  }
  
  .game-over-title {
    font-size: 2.6rem;
  }
  
  .score-summary {
    gap: 15px;
    margin-bottom: 25px;
  }
  
  .summary-card {
    padding: 10px 15px;
  }
  
  .summary-score {
    font-size: 1.25rem;
  }
}