:root {
  --bg-dark: #0a0a16;
  --bg-panel: rgba(16, 16, 36, 0.7);
  --border-glow: rgba(0, 240, 255, 0.3);
  
  --neon-blue: #00f0ff;
  --neon-pink: #ff007f;
  --neon-purple: #9d00ff;
  --neon-green: #39ff14;
  --neon-yellow: #fff200;
  --neon-red: #ff3131;
  
  --shadow-blue: 0 0 10px rgba(0, 240, 255, 0.5), 0 0 20px rgba(0, 240, 255, 0.2);
  --shadow-pink: 0 0 10px rgba(ff, 0, 7f, 0.5), 0 0 20px rgba(ff, 0, 7f, 0.2);
  
  --font-title: 'Orbitron', sans-serif;
  --font-body: 'Rajdhani', sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1.1rem;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

/* Background Cyber Grid Animation */
.cyber-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(18, 16, 45, 1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 16, 45, 1) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center center;
  z-index: 1;
  opacity: 0.8;
  pointer-events: none;
}

.cyber-grid::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, transparent 20%, var(--bg-dark) 80%);
  pointer-events: none;
}

/* Scanline Effect */
.scanlines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    rgba(18, 16, 16, 0) 50%, 
    rgba(0, 0, 0, 0.25) 50%
  ), linear-gradient(
    90deg,
    rgba(255, 0, 0, 0.06),
    rgba(0, 255, 0, 0.02),
    rgba(0, 0, 255, 0.06)
  );
  background-size: 100% 4px, 6px 100%;
  z-index: 999;
  pointer-events: none;
  opacity: 0.4;
}

/* Glassmorphism Panel styles */
.glass-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-glow);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 4px;
}

/* Main Container */
#game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  z-index: 10;
  position: relative;
  max-width: 100%;
}

/* HUD Header styling */
#hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 800px;
  padding: 10px 25px;
  border-bottom: 2px solid var(--neon-blue);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.15);
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hud-label {
  font-family: var(--font-title);
  font-size: 0.8rem;
  letter-spacing: 2px;
  color: #8899af;
  margin-bottom: 2px;
}

.hud-value {
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: 700;
  text-shadow: 0 0 8px currentColor;
  letter-spacing: 1px;
}

/* Lives Shield Heart */
#lives-container {
  display: flex;
  gap: 5px;
}

.shield-segment {
  width: 15px;
  height: 15px;
  background: var(--neon-green);
  border: 1px solid #fff;
  box-shadow: 0 0 8px var(--neon-green);
  transform: skewX(-20deg);
  display: inline-block;
  transition: all 0.3s ease;
}

.shield-segment.lost {
  background: rgba(255, 255, 255, 0.1);
  box-shadow: none;
  border-color: rgba(255, 255, 255, 0.2);
}

/* Color presets */
.neon-blue { color: var(--neon-blue); text-shadow: 0 0 8px var(--neon-blue); }
.neon-pink { color: var(--neon-pink); text-shadow: 0 0 8px var(--neon-pink); }
.neon-cyan { color: var(--neon-blue); text-shadow: 0 0 8px var(--neon-blue); }
.neon-yellow { color: var(--neon-yellow); text-shadow: 0 0 8px var(--neon-yellow); }
.neon-red { color: var(--neon-red); text-shadow: 0 0 8px var(--neon-red); }

/* Canvas wrapper for screen shakes */
#canvas-wrapper {
  position: relative;
  width: 800px;
  height: 600px;
  border: 2px solid var(--neon-blue);
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.25);
  border-radius: 4px;
  overflow: hidden;
  background-color: rgba(5, 5, 15, 0.9);
}

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

/* Screen Overlays */
.screen-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 5, 15, 0.85);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

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

/* Glitch Title Animation */
.glitch-title {
  font-family: var(--font-title);
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: 5px;
  color: #fff;
  text-shadow: 
    2px 2px var(--neon-pink),
    -2px -2px var(--neon-blue);
  position: relative;
  animation: glitch 1.5s infinite steps(2);
  margin-bottom: 5px;
}

.glitch-title::before,
.glitch-title::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: transparent;
}

.glitch-title::before {
  left: 2px;
  text-shadow: -2px 0 var(--neon-blue);
  clip: rect(24px, 550px, 90px, 0);
  animation: glitch-anim 2s infinite linear alternate-reverse;
}

.glitch-title::after {
  left: -2px;
  text-shadow: -2px 0 var(--neon-pink);
  clip: rect(85px, 550px, 140px, 0);
  animation: glitch-anim2 2s infinite linear alternate-reverse;
}

.subtitle {
  font-family: var(--font-title);
  font-size: 1.1rem;
  letter-spacing: 4px;
  color: var(--neon-blue);
  text-shadow: 0 0 5px var(--neon-blue);
  margin-bottom: 30px;
}

.subtitle.red-text {
  color: var(--neon-red);
  text-shadow: 0 0 5px var(--neon-red);
}

.subtitle.green-text {
  color: var(--neon-green);
  text-shadow: 0 0 5px var(--neon-green);
}

/* Menu panel */
.menu-box, .stats-box {
  width: 450px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.instruction-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  margin-bottom: 10px;
}

.inst-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
  padding-bottom: 8px;
}

.key {
  font-family: var(--font-title);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 0.9rem;
  color: var(--neon-blue);
  box-shadow: 0 0 5px rgba(0, 240, 255, 0.2);
}

.desc {
  font-size: 0.95rem;
  color: #a0aec0;
  letter-spacing: 1px;
}

/* Audio toggle check */
.audio-toggle-container {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 5px;
}

.audio-label {
  font-size: 0.85rem;
  letter-spacing: 1px;
  color: #a0aec0;
}

/* Switch Styles */
.switch {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 20px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255,255,255,0.1);
  transition: .4s;
  border: 1px solid rgba(255,255,255,0.2);
}

.slider:before {
  position: absolute;
  content: "";
  height: 12px;
  width: 12px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: rgba(0, 240, 255, 0.2);
  border-color: var(--neon-blue);
}

input:checked + .slider:before {
  background-color: var(--neon-blue);
  box-shadow: 0 0 8px var(--neon-blue);
  transform: translateX(18px);
}

.slider.round {
  border-radius: 20px;
}

.slider.round:before {
  border-radius: 50%;
}

/* Futuristic Diagonal Cyber Button */
.cyber-btn {
  position: relative;
  background: transparent;
  border: 1px solid var(--neon-blue);
  color: #fff;
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 15px 35px;
  cursor: pointer;
  outline: none;
  width: 100%;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: all 0.3s ease;
  overflow: hidden;
}

.cyber-btn .btn-text {
  position: relative;
  z-index: 5;
}

.cyber-btn .btn-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--neon-blue);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1;
}

.cyber-btn:hover {
  text-shadow: 0 0 8px #fff;
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
}

.cyber-btn:hover .btn-glow {
  opacity: 0.15;
}

.cyber-btn:active {
  transform: scale(0.98);
}

/* Alternate button styles */
.red-btn {
  border-color: var(--neon-red);
}
.red-btn:hover {
  box-shadow: 0 0 15px rgba(255, 49, 49, 0.4);
}
.red-btn .btn-glow {
  background: var(--neon-red);
}

.green-btn {
  border-color: var(--neon-green);
}
.green-btn:hover {
  box-shadow: 0 0 15px rgba(57, 255, 20, 0.4);
}
.green-btn .btn-glow {
  background: var(--neon-green);
}

/* Stats and Score styling */
.stats-box {
  border-color: var(--border-glow);
}

.stat-row {
  display: flex;
  justify-content: space-between;
  width: 100%;
  font-size: 1.2rem;
  letter-spacing: 1px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 10px;
}

.stat-row span:first-child {
  color: #8899af;
}

.highscore-container {
  margin-top: 20px;
  font-family: var(--font-title);
  font-size: 1.1rem;
  letter-spacing: 2px;
}

/* Screen Shake animations */
@keyframes shake {
  0% { transform: translate(0, 0); }
  10% { transform: translate(-3px, -2px); }
  20% { transform: translate(3px, 1px); }
  30% { transform: translate(-1px, 3px); }
  40% { transform: translate(2px, -1px); }
  50% { transform: translate(-3px, 1px); }
  60% { transform: translate(2px, 2px); }
  70% { transform: translate(-1px, -1px); }
  80% { transform: translate(3px, 1px); }
  90% { transform: translate(-2px, -2px); }
  100% { transform: translate(0, 0); }
}

.shake {
  animation: shake 0.2s ease-in-out;
}

/* Blinking text */
.blink-text {
  font-family: var(--font-title);
  font-size: 1.1rem;
  color: #8899af;
  letter-spacing: 3px;
  margin-top: 20px;
  animation: blink 1.5s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* Active Powerups HUD positioning */
#active-powerups {
  position: absolute;
  bottom: 20px;
  left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 80;
  pointer-events: none;
}

.powerup-badge {
  font-family: var(--font-title);
  font-size: 0.8rem;
  letter-spacing: 1px;
  background: rgba(5, 5, 15, 0.85);
  border: 1px solid var(--neon-blue);
  color: #fff;
  padding: 6px 12px;
  border-radius: 3px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
  animation: slide-in 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.powerup-badge .time-bar {
  height: 3px;
  background: var(--neon-blue);
  box-shadow: 0 0 5px var(--neon-blue);
  border-radius: 2px;
  margin-top: 4px;
}

/* Animations for glitch titles */
@keyframes glitch {
  0% {
    text-shadow: 2px 2px var(--neon-pink), -2px -2px var(--neon-blue);
  }
  25% {
    text-shadow: -2px -2px var(--neon-pink), 2px 2px var(--neon-blue);
  }
  50% {
    text-shadow: 2px -2px var(--neon-pink), -2px 2px var(--neon-blue);
  }
  75% {
    text-shadow: -2px 2px var(--neon-pink), 2px -2px var(--neon-blue);
  }
  100% {
    text-shadow: 2px 2px var(--neon-pink), -2px -2px var(--neon-blue);
  }
}

@keyframes glitch-anim {
  0% { clip: rect(44px, 9999px, 56px, 0); }
  20% { clip: rect(12px, 9999px, 30px, 0); }
  40% { clip: rect(85px, 9999px, 140px, 0); }
  60% { clip: rect(3px, 9999px, 75px, 0); }
  80% { clip: rect(98px, 9999px, 110px, 0); }
  100% { clip: rect(14px, 9999px, 85px, 0); }
}

@keyframes glitch-anim2 {
  0% { clip: rect(22px, 9999px, 80px, 0); }
  30% { clip: rect(95px, 9999px, 120px, 0); }
  50% { clip: rect(5px, 9999px, 45px, 0); }
  75% { clip: rect(65px, 9999px, 115px, 0); }
  100% { clip: rect(35px, 9999px, 90px, 0); }
}

@keyframes slide-in {
  from { transform: translateX(-20px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}