/* ============================================
   CSS RESET & BASE STYLES
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Visually hidden utility class for screen readers */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:root {
  --primary-color: #00ff88;
  --primary-dark: #00cc88;
  --primary-light: #00ffaa;
  --secondary-color: #88ffcc;
  --bg-dark: #0a0a0a;
  --bg-darker: #1a1a2e;
  --bg-panel: rgba(0, 0, 0, 0.85);
  --danger-color: #ff4444;
  --warning-color: #ffaa00;
  --info-color: #00ffff;
  --text-primary: #ffffff;
  --text-secondary: #88ffcc;
  --border-color: rgba(0, 255, 136, 0.3);
  --focus-shadow: 0 0 0 3px rgba(0, 255, 136, 0.5);
  --transition-speed: 0.3s;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
  color: var(--text-primary);
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Focus styles for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

#game-container {
  position: relative;
  width: 100%;
  max-width: 1920px;
  height: 100vh;
  max-height: 1080px;
  margin: 0 auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

#game-canvas {
  width: 100%;
  height: 100%;
  border: 2px solid var(--primary-color);
  background: #0f0f1e;
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
  cursor: crosshair;
  display: block;
}

/* ============================================
   JOIN SCREEN
   ============================================ */
#join-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(10, 10, 30, 0.95) 0%,
    rgba(20, 20, 50, 0.95) 100%
  );
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.join-content {
  text-align: center;
  padding: 2.5rem;
  max-width: 500px;
  width: 90%;
  background: rgba(0, 0, 0, 0.7);
  border-radius: 20px;
  border: 2px solid var(--primary-color);
  box-shadow: 0 0 40px rgba(0, 255, 136, 0.3);
  animation: slideUp 0.6s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.game-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: bold;
  color: var(--primary-color);
  text-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
  margin-bottom: 0.5rem;
  letter-spacing: 3px;
  line-height: 1.2;
}

.game-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--secondary-color);
  margin-bottom: 2rem;
  opacity: 0.9;
}

.join-form {
  margin-bottom: 2rem;
}

/* Input Group Styles */
.input-group {
  position: relative;
  margin-bottom: 1rem;
}

.input-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary-color);
  pointer-events: none;
  z-index: 1;
}

#server-address,
#player-name {
  width: 100%;
  padding: 15px 20px 15px 45px;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  background: rgba(0, 0, 0, 0.6);
  color: var(--text-primary);
  border-radius: 10px;
  transition: all var(--transition-speed) ease;
  outline: none;
}

#server-address:focus,
#player-name:focus {
  border-color: var(--primary-color);
  box-shadow: var(--focus-shadow);
  transform: scale(1.02);
  background: rgba(0, 0, 0, 0.8);
}

#server-address::placeholder,
#player-name::placeholder {
  color: rgba(136, 255, 204, 0.5);
}

.input-hint {
  display: block;
  text-align: left;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 0.25rem;
  margin-bottom: 1rem;
  opacity: 0.8;
}

/* Keyboard key styles */
kbd {
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid var(--primary-color);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: monospace;
  font-size: 0.85em;
  margin: 0 2px;
}

.btn-primary {
  padding: 15px 40px;
  font-size: 1.1rem;
  font-weight: bold;
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--primary-dark) 100%
  );
  color: #000;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  box-shadow: 0 4px 15px rgba(0, 255, 136, 0.4);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 6px 25px rgba(0, 255, 136, 0.6);
  background: linear-gradient(135deg, var(--primary-light) 0%, #00dd99 100%);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary:focus-visible {
  box-shadow: var(--focus-shadow), 0 6px 25px rgba(0, 255, 136, 0.6);
}

.btn-loader {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: #000;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn-primary.loading .btn-loader {
  display: block;
}

.btn-primary.loading span:not(.btn-loader) {
  opacity: 0.6;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.game-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(15px, 3vw, 30px);
  margin-top: 1.5rem;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  color: var(--text-secondary);
  padding: 8px 12px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.info-item i {
  font-size: 1.2rem;
  color: var(--primary-color);
}

/* ============================================
   LOBBY SCREEN
   ============================================ */
#lobby-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(10, 10, 30, 0.95) 0%,
    rgba(20, 20, 50, 0.95) 100%
  );
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1001;
  animation: fadeIn 0.5s ease;
}

.lobby-content {
  text-align: center;
  padding: 2.5rem;
  max-width: 600px;
  width: 90%;
  background: rgba(0, 0, 0, 0.7);
  border-radius: 20px;
  border: 2px solid var(--primary-color);
  box-shadow: 0 0 40px rgba(0, 255, 136, 0.3);
  animation: slideUp 0.6s ease;
}

.lobby-info {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin: 30px 0;
}

.info-card {
  flex: 1;
  padding: 20px;
  background: rgba(0, 255, 136, 0.05);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  transition: all var(--transition-speed) ease;
}

.info-card:hover {
  background: rgba(0, 255, 136, 0.1);
  border-color: var(--primary-color);
  transform: translateY(-3px);
}

.info-card i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 10px;
  display: block;
}

.info-label {
  font-size: 0.9rem;
  color: var(--secondary-color);
  margin-bottom: 8px;
}

.info-value {
  font-size: 2rem;
  font-weight: bold;
  color: var(--primary-color);
}

.lobby-leaderboard {
  margin: 30px 0;
  padding: 20px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.lobby-leaderboard h3 {
  color: var(--primary-color);
  margin-bottom: 15px;
  font-size: 1.3rem;
}

#lobby-scores {
  max-height: 250px;
  overflow-y: auto;
}

#lobby-scores::-webkit-scrollbar {
  width: 6px;
}

#lobby-scores::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 3px;
}

#lobby-scores::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

#lobby-scores::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

.lobby-score-item {
  padding: 10px 15px;
  margin-bottom: 8px;
  background: rgba(0, 255, 136, 0.05);
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-left: 3px solid var(--primary-color);
  transition: all 0.2s ease;
}

.lobby-score-item:hover {
  background: rgba(0, 255, 136, 0.1);
  transform: translateX(5px);
}

.lobby-score-rank {
  font-weight: bold;
  color: var(--warning-color);
  margin-right: 10px;
  min-width: 35px;
}

.lobby-score-name {
  flex: 1;
  color: var(--text-primary);
  text-align: left;
}

.lobby-score-value {
  font-weight: bold;
  color: var(--primary-color);
  min-width: 40px;
  text-align: right;
}

.no-players {
  color: var(--secondary-color);
  opacity: 0.7;
  font-style: italic;
  padding: 30px 20px;
  text-align: center;
}

.lobby-actions {
  margin-top: 20px;
}

#lobby-join-btn {
  width: 100%;
  font-size: 1.2rem;
}

/* ============================================
   GAME HUD
   ============================================ */
#game-hud {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: none;
}

#game-hud.active {
  display: block;
}

#game-hud * {
  pointer-events: auto;
}

#top-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  min-height: 60px;
  background: linear-gradient(
    180deg,
    rgba(0, 0, 0, 0.8) 0%,
    rgba(0, 0, 0, 0) 100%
  );
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.hud-section {
  display: flex;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
}

.hud-section.center {
  flex: 1;
  justify-content: center;
  min-width: 200px;
}

#player-stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  background: rgba(0, 0, 0, 0.6);
  border-radius: 8px;
  border: 1px solid rgba(0, 255, 136, 0.3);
  font-weight: bold;
  font-size: 1.1rem;
}

.stat-item i {
  color: #00ff88;
  font-size: 1.2rem;
}

/* Ping indicator styles */
.ping-indicator {
  position: relative;
}

.ping-unit {
  font-size: 0.75rem;
  opacity: 0.8;
  margin-left: 2px;
}

.ping-indicator.ping-good i {
  color: #00ff88;
}

.ping-indicator.ping-medium i {
  color: #ffaa00;
}

.ping-indicator.ping-bad i {
  color: #ff4444;
}

.ping-indicator.ping-good #ping-text {
  color: #00ff88;
}

.ping-indicator.ping-medium #ping-text {
  color: #ffaa00;
}

.ping-indicator.ping-bad #ping-text {
  color: #ff4444;
}

/* FPS indicator styles */
.fps-indicator {
  position: relative;
}

.fps-unit {
  font-size: 0.75rem;
  opacity: 0.8;
  margin-left: 2px;
}

.fps-indicator.fps-good i {
  color: #00ff88;
}

.fps-indicator.fps-medium i {
  color: #ffaa00;
}

.fps-indicator.fps-bad i {
  color: #ff4444;
}

.fps-indicator.fps-good #fps-text {
  color: #00ff88;
}

.fps-indicator.fps-medium #fps-text {
  color: #ffaa00;
}

.fps-indicator.fps-bad #fps-text {
  color: #ff4444;
}

#power-up-indicator {
  display: flex;
  gap: 15px;
  align-items: center;
  flex-wrap: wrap;
  animation: none;
}

.powerup-item {
  padding: 8px 16px;
  background: rgba(0, 0, 0, 0.7);
  border-radius: 8px;
  border: 2px solid;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  animation: powerupPulse 0.8s infinite;
}

.powerup-item i {
  font-size: 1.3rem;
}

.powerup-item .powerup-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.shield-active {
  border-color: #00ffff;
  color: #00ffff;
  background: rgba(0, 255, 255, 0.1);
}

.speed-boost-active {
  border-color: #ffff00;
  color: #ffff00;
  background: rgba(255, 255, 0, 0.1);
}

.double-fire-active {
  border-color: #ff6600;
  color: #ff6600;
  background: rgba(255, 102, 0, 0.1);
  animation: doubleBulletPulse 0.8s infinite;
}

/* Enhanced Shield Animation */
.shield-active {
  animation: shieldPulse 0.6s infinite;
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.6);
}

.shield-active i::before {
  animation: shieldGlow 0.8s infinite;
}

/* Enhanced Double Fire Animation */
.double-fire-active i::before {
  animation: doubleBulletGlow 0.6s infinite;
}

.heat-indicator {
  padding: 6px 12px;
  background: rgba(0, 0, 0, 0.8);
  border: 2px solid #00ff88;
  border-radius: 6px;
  min-width: 120px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* Vertical Heat Bar - Matches Minimap Height */
#heat-bar-vertical {
  position: absolute;
  left: 20px;
  bottom: 20px;
  width: 40px;
  height: 194px; /* Matches minimap: 150px canvas + 44px header (approx) */
  background: rgba(0, 0, 0, 0.8);
  border: 2px solid #00ff88;
  border-radius: 8px;
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
  z-index: 100;
  padding: 4px;
  gap: 1px;
}

#heat-bar-vertical::after {
  content: "HEAT";
  position: absolute;
  bottom: 10px;
  font-size: 0.7rem;
  font-weight: bold;
  letter-spacing: 1px;
  color: #00ff88;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  white-space: nowrap;
}

.heat-bar-segment {
  width: 28px;
  height: 6px;
  border-radius: 1px;
  background: #00ff88;
  transition: background-color 0.2s;
}

.heat-label {
  font-size: 0.8rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  z-index: 1;
  color: #ffffff;
}

@keyframes powerupPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.08);
    opacity: 0.9;
  }
}

@keyframes shieldPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
    border-color: #00ffff;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.8;
    border-color: #00ccff;
  }
}

@keyframes shieldGlow {
  0%,
  100% {
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.8),
      0 0 20px rgba(0, 255, 255, 0.4);
  }
  50% {
    text-shadow: 0 0 15px rgba(0, 255, 255, 1), 0 0 30px rgba(0, 255, 255, 0.6);
  }
}

@keyframes doubleBulletPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
    border-color: #ff6600;
    box-shadow: 0 0 10px rgba(255, 102, 0, 0.5);
  }
  50% {
    transform: scale(1.1);
    opacity: 0.9;
    border-color: #ff8833;
    box-shadow: 0 0 20px rgba(255, 102, 0, 0.8);
  }
}

@keyframes doubleBulletGlow {
  0%,
  100% {
    text-shadow: 0 0 8px rgba(255, 102, 0, 0.8), 0 0 15px rgba(255, 68, 0, 0.4);
  }
  50% {
    text-shadow: 0 0 12px rgba(255, 102, 0, 1), 0 0 25px rgba(255, 68, 0, 0.6);
  }
}

/* Bonus Collection Animations */
@keyframes bonusCollectBurst {
  0% {
    transform: scale(1);
    opacity: 1;
    box-shadow: 0 0 0 0 currentColor;
  }
  50% {
    box-shadow: 0 0 10px 10px rgba(255, 255, 0, 0.4);
  }
  100% {
    transform: scale(1.2);
    opacity: 0;
    box-shadow: 0 0 20px 20px rgba(255, 255, 0, 0);
  }
}

@keyframes bonusSparkPulse {
  0% {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
  100% {
    transform: scale(0) translateY(-20px);
    opacity: 0;
  }
}

@keyframes bonusCollectGlow {
  0%,
  100% {
    box-shadow: 0 0 10px rgba(255, 255, 0, 0.5);
  }
  50% {
    box-shadow: 0 0 25px rgba(255, 255, 0, 1);
  }
}

@keyframes bonusFloatUp {
  0% {
    transform: translate(-50%, -50%) scale(1.2);
    opacity: 1;
  }
  50% {
    transform: translate(-50%, -120px) scale(1);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -200px) scale(0.8);
    opacity: 0;
  }
}

/* Tank Power-Up Highlight Animations */
@keyframes tankShieldGlow {
  0%,
  100% {
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.6),
      0 0 20px rgba(0, 255, 255, 0.3);
    box-shadow: inset 0 0 15px rgba(0, 255, 255, 0.4),
      0 0 20px rgba(0, 255, 255, 0.5);
  }
  50% {
    text-shadow: 0 0 20px rgba(0, 255, 255, 1), 0 0 30px rgba(0, 255, 255, 0.6);
    box-shadow: inset 0 0 25px rgba(0, 255, 255, 0.6),
      0 0 30px rgba(0, 255, 255, 0.8);
  }
}

@keyframes tankDoubleFireGlow {
  0%,
  100% {
    text-shadow: 0 0 12px rgba(255, 102, 0, 0.7), 0 0 20px rgba(255, 68, 0, 0.4);
    box-shadow: inset 0 0 15px rgba(255, 102, 0, 0.3),
      0 0 18px rgba(255, 102, 0, 0.6);
  }
  50% {
    text-shadow: 0 0 20px rgba(255, 102, 0, 1), 0 0 35px rgba(255, 68, 0, 0.7);
    box-shadow: inset 0 0 25px rgba(255, 102, 0, 0.5),
      0 0 28px rgba(255, 102, 0, 1);
  }
}

@keyframes tankSpeedBoostGlow {
  0%,
  100% {
    text-shadow: 0 0 10px rgba(255, 255, 0, 0.6),
      0 0 15px rgba(255, 200, 0, 0.3);
    box-shadow: inset 0 0 12px rgba(255, 255, 0, 0.2),
      0 0 15px rgba(255, 255, 0, 0.4);
  }
  50% {
    text-shadow: 0 0 18px rgba(255, 255, 0, 0.9),
      0 0 30px rgba(255, 200, 0, 0.6);
    box-shadow: inset 0 0 20px rgba(255, 255, 0, 0.4),
      0 0 25px rgba(255, 255, 0, 0.7);
  }
}

@keyframes doubleFireMuzzleFlash {
  0% {
    opacity: 1;
    filter: brightness(1.5);
  }
  100% {
    opacity: 0;
    filter: brightness(1);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
}

.icon-btn {
  background: rgba(0, 0, 0, 0.6);
  border: 2px solid var(--border-color);
  color: var(--primary-color);
  padding: 10px 15px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all var(--transition-speed) ease;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background: rgba(0, 255, 136, 0.2);
  border-color: var(--primary-color);
  transform: scale(1.1);
}

.icon-btn:focus-visible {
  box-shadow: var(--focus-shadow);
}

.icon-btn.active {
  background: rgba(255, 0, 0, 0.3);
  border-color: var(--danger-color);
  color: var(--danger-color);
}

/* Panels */
.panel {
  position: absolute;
  background: var(--bg-panel);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  max-width: 90vw;
}

.panel-header {
  padding: 12px 15px;
  background: rgba(0, 255, 136, 0.1);
  border-bottom: 1px solid var(--border-color);
  font-weight: bold;
  font-size: 0.9rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--primary-color);
}

.panel-header i {
  margin-right: 8px;
}

.panel-content {
  padding: 10px;
  max-height: 300px;
  overflow-y: auto;
  font-size: 0.9rem;
}

/* Custom scrollbar */
.panel-content::-webkit-scrollbar {
  width: 8px;
}

.panel-content::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 4px;
}

.panel-content::-webkit-scrollbar-thumb {
  background: rgba(0, 255, 136, 0.3);
  border-radius: 4px;
  transition: background var(--transition-speed);
}

.panel-content::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 255, 136, 0.5);
}

/* Leaderboard */
#leaderboard {
  top: 80px;
  left: 20px;
  width: 240px;
  max-height: calc(100vh - 400px);
}

#scores {
  max-height: 350px;
}

.score-item {
  padding: 8px 10px;
  margin-bottom: 5px;
  background: rgba(0, 255, 136, 0.05);
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
  font-size: 0.85rem;
}

.score-item:hover {
  background: rgba(0, 255, 136, 0.15);
}

.score-item.self {
  background: rgba(0, 255, 136, 0.2);
  border: 1px solid rgba(0, 255, 136, 0.5);
}

.score-rank {
  font-weight: bold;
  color: #ffaa00;
  margin-right: 10px;
}

.score-name {
  flex: 1;
  color: #ffffff;
}

.score-value {
  font-weight: bold;
  color: #00ff88;
}

/* Chat */
#chat-panel {
  bottom: 20px;
  right: 20px;
  width: 420px;
  max-height: calc(100vh - 200px);
}

#chat-messages {
  max-height: 280px;
  min-height: 150px;
}

.chat-message {
  padding: 6px 10px;
  margin-bottom: 5px;
  background: rgba(0, 255, 136, 0.05);
  border-radius: 6px;
  border-left: 3px solid #00ff88;
  animation: slideInLeft 0.3s ease;
}

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

.chat-message .sender {
  font-weight: bold;
  color: #00ff88;
  margin-right: 5px;
}

.chat-message .text {
  color: #ffffff;
}

.chat-input-wrapper {
  display: flex;
  gap: 5px;
  padding: 10px;
  border-top: 1px solid rgba(0, 255, 136, 0.3);
}

#chat-input {
  flex: 1;
  padding: 10px;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(0, 255, 136, 0.3);
  border-radius: 6px;
  color: #ffffff;
  font-size: 0.9rem;
  outline: none;
  transition: all 0.3s ease;
}

#chat-input:focus {
  border-color: #00ff88;
  box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.icon-btn-small {
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid var(--border-color);
  color: var(--primary-color);
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-speed) ease;
  min-width: 36px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon-btn-small:hover {
  background: rgba(0, 255, 136, 0.2);
  transform: scale(1.1);
}

.icon-btn-small:focus-visible {
  box-shadow: var(--focus-shadow);
}

/* Minimap */
#minimap-container {
  bottom: 20px;
  /* place minimap to the right of the vertical heat bar (40px) plus a small gap */
  left: calc(20px + 40px + 12px);
  width: 240px;
  z-index: 50;
  display: block;
}

#minimap {
  display: block;
  background: rgba(0, 20, 10, 0.8);
  border-radius: 8px;
}

/* Kill Feed */
#kill-feed {
  position: absolute;
  top: 80px;
  right: 20px;
  width: 380px;
  max-height: calc(100vh - 400px);
  pointer-events: none;
}

.kill-notification {
  padding: 10px 15px;
  margin-bottom: 8px;
  background: rgba(0, 0, 0, 0.8);
  border-left: 3px solid #ff4444;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideInLeft 0.3s ease, fadeOut 0.5s ease 4.5s forwards;
}

@keyframes fadeOut {
  to {
    opacity: 0;
    transform: translateX(-20px);
  }
}

.kill-notification i {
  color: #ff4444;
}

.kill-notification .killer {
  font-weight: bold;
  color: #00ff88;
}

.kill-notification .victim {
  font-weight: bold;
  color: #ff4444;
}

/* Respawn Overlay */
#respawn-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  animation: fadeIn 0.3s ease;
}

.respawn-content {
  text-align: center;
  animation: pulse 1s infinite;
}

.respawn-content i {
  font-size: 5rem;
  color: #ff4444;
  margin-bottom: 20px;
}

/* Settings Panel - Dropdown Style */
#settings-panel {
  position: absolute;
  top: 70px;
  right: 20px;
  background: rgba(0, 0, 0, 0.95);
  border: 2px solid var(--primary-color);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 255, 136, 0.4);
  min-width: 320px;
  max-width: 380px;
  z-index: 2000;
  animation: slideDown 0.3s ease;
  overflow: hidden;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.settings-panel {
  /* Container already defined by #settings-panel */
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  background: linear-gradient(
    135deg,
    rgba(0, 255, 136, 0.1) 0%,
    rgba(0, 255, 136, 0.05) 100%
  );
  border-bottom: 1px solid var(--border-color);
}

.settings-header h3 {
  color: var(--primary-color);
  margin: 0;
  font-size: 1.2rem;
  font-weight: bold;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.settings-header h3::before {
  content: "⚙";
  font-size: 1.3rem;
}

#close-settings {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.8rem;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  border-radius: 5px;
  transition: all var(--transition-speed);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

#close-settings:hover {
  background: rgba(255, 68, 68, 0.2);
  color: var(--danger-color);
  transform: rotate(90deg);
}

#close-settings:focus-visible {
  outline: 2px solid var(--danger-color);
  outline-offset: 2px;
}

.settings-content {
  padding: 15px 20px;
  max-height: 400px;
  overflow-y: auto;
}

.settings-content::-webkit-scrollbar {
  width: 6px;
}

.settings-content::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 3px;
}

.settings-content::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.settings-content::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding: 12px 15px;
  background: rgba(0, 255, 136, 0.03);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-speed);
}

.setting-item:last-child {
  margin-bottom: 0;
}

.setting-item:hover {
  background: rgba(0, 255, 136, 0.08);
  border-color: var(--primary-color);
}

.setting-label {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 500;
  cursor: pointer;
  font-size: 0.95rem;
}

.setting-label i {
  color: var(--primary-color);
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

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

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #444;
  transition: var(--transition-speed);
  border-radius: 24px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-speed);
  border-radius: 50%;
}

input:checked + .toggle-slider {
  background-color: var(--primary-color);
}

input:checked + .toggle-slider:before {
  transform: translateX(26px);
}

input:focus-visible + .toggle-slider {
  box-shadow: var(--focus-shadow);
}

.respawn-content h2 {
  font-size: clamp(2rem, 5vw, 2.5rem);
  color: var(--danger-color);
  margin-bottom: 10px;
  text-shadow: 0 0 20px rgba(255, 68, 68, 0.5);
}

.respawn-content p {
  font-size: clamp(1rem, 3vw, 1.3rem);
  color: var(--text-primary);
}

#respawn-timer {
  color: var(--primary-color);
  font-weight: bold;
  font-size: 1.5rem;
}

/* Notifications */
#notifications {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 600;
  max-width: 90vw;
}

.notification {
  padding: 15px 30px;
  margin-bottom: 10px;
  background: rgba(0, 0, 0, 0.9);
  border: 2px solid var(--warning-color);
  border-radius: 10px;
  font-size: clamp(1rem, 3vw, 1.2rem);
  font-weight: bold;
  color: var(--warning-color);
  text-align: center;
  animation: popIn 0.3s ease, fadeOut 0.5s ease 2.5s forwards;
  box-shadow: 0 0 20px rgba(255, 170, 0, 0.5);
  word-wrap: break-word;
}

.notification.error {
  border-color: var(--danger-color);
  color: var(--danger-color);
  box-shadow: 0 0 20px rgba(255, 68, 68, 0.5);
}

.notification.success {
  border-color: var(--primary-color);
  color: var(--primary-color);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
}

.notification.info {
  border-color: var(--info-color);
  color: var(--info-color);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
}

@keyframes popIn {
  from {
    transform: scale(0.5);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* Loading Overlay */
#loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1500;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
}

#loading-overlay.active {
  display: flex;
}

.loading-content {
  text-align: center;
}

.loader {
  width: 60px;
  height: 60px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

#loading-text {
  color: var(--primary-color);
  font-size: 1.2rem;
  font-weight: bold;
  animation: pulse 1.5s ease-in-out infinite;
}

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

/* Tablet and smaller */
@media (max-width: 1250px) {
  #game-container {
    width: 100%;
    height: 100vh;
    max-height: none;
    margin: 0;
  }

  #game-canvas {
    width: 100%;
    height: 100%;
    border-width: 1px;
  }

  .panel {
    max-width: 95vw;
  }

  #leaderboard,
  #minimap-container {
    width: 200px;
  }

  #chat-panel {
    width: 320px;
  }

  #top-bar {
    padding: 5px 10px;
  }

  .stat-item {
    padding: 6px 10px;
    font-size: 0.9rem;
  }
}

/* Mobile devices */
@media (max-width: 768px) {
  .join-content,
  .lobby-content {
    padding: 1.5rem;
    max-width: 95%;
  }

  .game-title {
    font-size: 2rem;
    letter-spacing: 2px;
  }

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

  #server-address,
  #player-name {
    font-size: 0.9rem;
    padding: 12px 15px 12px 40px;
  }

  .btn-primary {
    padding: 12px 30px;
    font-size: 1rem;
  }

  .game-info {
    flex-direction: column;
    gap: 10px;
  }

  /* Lobby screen responsive styles */
  .lobby-info {
    flex-direction: column;
    gap: 15px;
  }

  .info-card {
    padding: 15px;
  }

  .info-card i {
    font-size: 1.5rem;
  }

  .info-value {
    font-size: 1.5rem;
  }

  .lobby-leaderboard {
    padding: 15px;
  }

  .lobby-leaderboard h3 {
    font-size: 1.1rem;
  }

  #lobby-scores {
    max-height: 200px;
  }

  .lobby-score-item {
    padding: 8px 12px;
    font-size: 0.9rem;
  }

  #lobby-join-btn {
    font-size: 1rem;
  }

  #top-bar {
    flex-direction: column;
    padding: 5px;
    min-height: auto;
  }

  .hud-section {
    width: 100%;
    justify-content: center;
  }

  #player-stats {
    gap: 5px;
  }

  .stat-item {
    padding: 5px 8px;
    font-size: 0.8rem;
  }

  #leaderboard {
    top: auto;
    bottom: 200px;
    left: 10px;
    width: 180px;
  }

  #chat-panel {
    bottom: 10px;
    right: 10px;
    left: 10px;
    width: auto;
  }

  #minimap-container {
    bottom: 10px;
    /* on mobile, account for smaller heat bar (30px) and a small gap */
    left: calc(10px + 30px + 8px);
    width: 150px;
  }

  #minimap {
    width: 150px;
    height: 112px;
  }

  #kill-feed {
    top: 10px;
    right: 10px;
    width: calc(100% - 20px);
  }

  #heat-bar-vertical {
    width: 30px;
    left: 10px;
    height: 156px; /* Matches mobile minimap: 112px canvas + 44px header (approx) */
  }

  .panel-header {
    font-size: 0.8rem;
    padding: 8px 10px;
  }

  .panel-content {
    font-size: 0.8rem;
    max-height: 150px;
  }

  /* Settings dropdown on mobile */
  #settings-panel {
    right: 10px;
    top: 60px;
    min-width: 280px;
    max-width: calc(100vw - 20px);
  }

  .settings-header h3 {
    font-size: 1rem;
  }

  .setting-item {
    padding: 10px 12px;
  }

  .setting-label {
    font-size: 0.85rem;
  }
}

/* Small mobile devices */
@media (max-width: 480px) {
  .join-content {
    padding: 1rem;
    border-radius: 15px;
  }

  .game-title {
    font-size: 1.5rem;
    letter-spacing: 1px;
  }

  .game-subtitle {
    font-size: 0.8rem;
    margin-bottom: 1.5rem;
  }

  #server-address,
  #player-name {
    font-size: 0.85rem;
    padding: 10px 12px 10px 35px;
  }

  .btn-primary {
    padding: 10px 20px;
    font-size: 0.9rem;
  }

  .info-item {
    font-size: 0.75rem;
    padding: 6px 8px;
  }

  kbd {
    padding: 1px 4px;
    font-size: 0.75em;
  }
}

/* Landscape mobile */
@media (max-height: 600px) and (orientation: landscape) {
  .join-content {
    padding: 1rem;
    max-height: 90vh;
    overflow-y: auto;
  }

  .game-title {
    font-size: 1.8rem;
    margin-bottom: 0.25rem;
  }

  .game-subtitle {
    margin-bottom: 1rem;
  }

  .game-info {
    gap: 10px;
    margin-top: 1rem;
  }

  #top-bar {
    flex-direction: row;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  #game-canvas {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Dark mode support (already dark, but for completeness) */
@media (prefers-color-scheme: light) {
  /* Keep dark theme regardless */
}