:root {
  /* Racing Aesthetic: High Contrast, Speed, Tech */
  --color-primary: #d4ff00; /* Toxic Yellow/Green */
  --color-secondary: #00ff66; /* Neon Green */
  --color-bg: #0d0d0d;
  --color-surface: #1a1a1a;
  --color-surface-soft: #262626;
  --color-text: #ffffff;
  --color-text-dim: #888888;
  --color-accent: #d4ff00;
  
  --font-display: 'Syncopate', sans-serif; /* High-tech racing font feel */
  --font-body: 'Rajdhani', sans-serif; /* Technical, sharp */
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;
  
  --skew-angle: -12deg;
  --glow-primary: 0 0 15px rgba(212, 255, 0, 0.4);
  --glow-secondary: 0 0 15px rgba(0, 255, 102, 0.4);
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 500;
  overflow: hidden; /* Mobile games usually don't scroll */
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3 {
  font-family: var(--font-display);
  text-transform: uppercase;
  margin: 0;
  letter-spacing: 2px;
  font-style: italic;
}

/* Background Elements */
.bg-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: 
    radial-gradient(circle at 80% 20%, rgba(212, 255, 0, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 20% 80%, rgba(0, 255, 102, 0.05) 0%, transparent 40%),
    linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 100%);
}

.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  perspective: 500px;
  transform: rotateX(60deg) translateY(-200px);
  opacity: 0.5;
}

/* Header / Status Bar */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(to bottom, rgba(0,0,0,0.8), transparent);
  z-index: 10;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.level-badge {
  background: var(--color-primary);
  color: #000;
  padding: 2px 10px;
  font-weight: 800;
  font-size: 14px;
  transform: skew(var(--skew-angle));
  box-shadow: var(--glow-primary);
}

.username {
  font-family: var(--font-display);
  font-size: 14px;
  font-style: italic;
}

.currency-group {
  display: flex;
  gap: var(--spacing-lg);
}

.currency-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: rgba(255,255,255,0.05);
  padding: 4px 12px;
  border-radius: 2px;
  border-right: 3px solid var(--color-secondary);
}

.currency-value {
  font-family: var(--font-display);
  font-size: 16px;
}

/* Main Content Area */
.main-stage {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--spacing-xl);
}

/* The Car Showcase (Visual Placeholder) */
.car-display {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -40%);
  width: 80%;
  height: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.car-silhouette {
  width: 100%;
  height: 200px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.car-silhouette::after {
  content: '';
  width: 80%;
  height: 4px;
  background: var(--color-secondary);
  position: absolute;
  bottom: 0;
  box-shadow: 0 10px 30px var(--color-secondary);
  filter: blur(2px);
}

.car-name-plate {
  margin-top: var(--spacing-lg);
  text-align: center;
}

.car-brand {
  font-size: 12px;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 4px;
}

.car-model {
  font-size: 48px;
  line-height: 1;
}

/* Stats Panel */
.stats-sidebar {
  position: absolute;
  left: var(--spacing-lg);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  z-index: 5;
}

.stat-item {
  width: 180px;
}

.stat-label {
  font-size: 10px;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
}

.stat-bar-bg {
  height: 4px;
  background: rgba(255,255,255,0.1);
  width: 100%;
  position: relative;
}

.stat-bar-fill {
  height: 100%;
  background: var(--color-secondary);
  box-shadow: 0 0 10px var(--color-secondary);
}

/* Bottom Navigation / Action Bar */
.bottom-actions {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: var(--spacing-lg);
  z-index: 10;
}

.menu-tabs {
  display: flex;
  gap: var(--spacing-sm);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--color-text-dim);
  padding: var(--spacing-md) var(--spacing-lg);
  font-family: var(--font-display);
  font-size: 12px;
  cursor: pointer;
  text-transform: uppercase;
  transition: var(--transition);
  border-bottom: 2px solid transparent;
}

.tab-btn.active {
  color: var(--color-text);
  border-bottom: 2px solid var(--color-primary);
  background: linear-gradient(to top, rgba(255,62,62,0.1), transparent);
}

.race-btn {
  background: var(--color-primary);
  color: #000;
  border: none;
  padding: 16px 64px;
  font-family: var(--font-display);
  font-size: 24px;
  font-style: italic;
  font-weight: 900;
  transform: skew(var(--skew-angle));
  cursor: pointer;
  box-shadow: var(--glow-primary);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.race-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  transition: 0.5s;
}

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

.race-btn:active {
  transform: skew(var(--skew-angle)) scale(0.95);
}

/* Level Selection Styles */
.levels-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--spacing-md) var(--spacing-xl);
  overflow: hidden;
}

.screen-header {
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.back-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text);
  padding: 10px 20px;
  font-family: var(--font-display);
  font-size: 12px;
  cursor: pointer;
  transform: skew(var(--skew-angle));
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.back-btn:hover {
  background: var(--color-surface-soft);
  border-color: var(--color-secondary);
}

.screen-title {
  font-size: 32px;
  color: var(--color-text);
}

.levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  overflow-y: auto;
  padding-right: var(--spacing-md);
  padding-bottom: var(--spacing-xl);
}

/* Custom scrollbar */
.levels-grid::-webkit-scrollbar {
  width: 6px;
}
.levels-grid::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.05);
}
.levels-grid::-webkit-scrollbar-thumb {
  background: var(--color-primary);
}

.level-card {
  background: var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
  transition: var(--transition);
  cursor: pointer;
  overflow: hidden;
  height: 200px;
  display: flex;
  flex-direction: column;
}

.level-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-primary);
  opacity: 0;
  transition: var(--transition);
}

.level-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  background: var(--color-surface-soft);
}

.level-card:hover::before {
  opacity: 1;
}

.level-thumbnail {
  height: 120px;
  width: 100%;
  background: linear-gradient(135deg, #1a1a1e 0%, #0a0a0c 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.level-thumbnail-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.8));
}

.level-badge-locked {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-text-dim);
  text-align: center;
}

.level-info {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.level-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.level-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-style: italic;
}

.level-difficulty {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-secondary);
}

.level-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--color-text-dim);
}

.level-reward {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-primary);
}

.level-card.locked {
  opacity: 0.6;
  filter: grayscale(0.5);
  cursor: not-allowed;
}

.level-card.locked:hover {
  transform: none;
  border-color: rgba(255, 255, 255, 0.05);
}

.chapter-selector {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: var(--spacing-sm);
}

.chapter-tab {
  padding: 8px 16px;
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--color-text-dim);
  cursor: pointer;
  transition: var(--transition);
}

.chapter-tab.active {
  color: var(--color-primary);
  position: relative;
}

.chapter-tab.active::after {
  content: '';
  position: absolute;
  bottom: -9px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-primary);
}

/* Side Panels */
.side-panel-right {
  position: absolute;
  right: var(--spacing-lg);
  bottom: 120px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  z-index: 5;
}

.square-btn {
  width: 60px;
  height: 60px;
  background: var(--color-surface);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.square-btn:hover {
  background: var(--color-surface-soft);
  border-color: var(--color-secondary);
}

.placeholder-icon {
  width: 24px;
  height: 24px;
  stroke: currentColor;
}

/* Animations */
@keyframes pulse {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}

.nitro-glow {
  animation: pulse 2s infinite;
}