@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Exo+2:wght@300;400;700&display=swap');
        
        :root {
            --primary: #FF6B35;
            --secondary: #004E89;
            --accent: #FFD23F;
            --success: #06FFA5;
            --danger: #FF3366;
            --dark: #1A1A2E;
            --light: #F8F9FA;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Exo 2', sans-serif;
            overflow: hidden;
            background: linear-gradient(180deg, #1A1A2E 0%, #16213E 100%);
            height: 100vh;
            color: var(--light);
        }
        
        #gameCanvas {
            display: block;
            background: linear-gradient(180deg, #87CEEB 0%, #E0F6FF 70%, #C2B280 70%, #8B7355 100%);
        }
        
        /* Top HUD */
        .top-hud {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            padding: 15px 20px;
            background: linear-gradient(180deg, rgba(26, 26, 46, 0.95) 0%, rgba(26, 26, 46, 0) 100%);
            z-index: 10;
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            pointer-events: none;
        }
        
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
        }
        
        .stat-card {
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(10px);
            border: 2px solid rgba(255, 107, 53, 0.3);
            border-radius: 12px;
            padding: 10px 15px;
            min-width: 140px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
        }
        
        .stat-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1px;
            opacity: 0.7;
            font-weight: 300;
            display: block;
            margin-bottom: 3px;
        }
        
        .stat-value {
            font-family: 'Orbitron', sans-serif;
            font-size: 24px;
            font-weight: 700;
            color: var(--accent);
            text-shadow: 0 0 10px rgba(255, 210, 63, 0.5);
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .stat-icon {
            font-size: 18px;
        }
        
        /* Fuel Bar */
        .fuel-container {
            margin-top: 5px;
        }
        
        .fuel-bar {
            width: 100%;
            height: 8px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 4px;
            overflow: hidden;
            position: relative;
        }
        
        .fuel-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--danger) 0%, var(--primary) 50%, var(--success) 100%);
            transition: width 0.3s, background 0.3s;
            border-radius: 4px;
            box-shadow: 0 0 10px rgba(6, 255, 165, 0.5);
        }
        
        .fuel-fill.low {
            animation: pulse 0.5s infinite;
        }
        
        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.6; }
        }
        
        /* Controls */
        .controls-container {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 30px;
            pointer-events: all;
            z-index: 10;
        }
        
        .control-group {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
        }
        
        .control-btn {
            width: 90px;
            height: 90px;
            border-radius: 50%;
            border: 4px solid rgba(255, 255, 255, 0.3);
            font-size: 40px;
            cursor: pointer;
            transition: all 0.1s;
            box-shadow: 0 8px 0 rgba(0, 0, 0, 0.3), 0 8px 30px rgba(0, 0, 0, 0.4);
            font-family: 'Orbitron', sans-serif;
            user-select: none;
            position: relative;
            overflow: hidden;
        }
        
        .control-btn::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.3);
            transform: translate(-50%, -50%);
            transition: width 0.3s, height 0.3s;
        }
        
        .control-btn:active::before {
            width: 100%;
            height: 100%;
        }
        
        .control-btn:active {
            transform: translateY(6px);
            box-shadow: 0 2px 0 rgba(0, 0, 0, 0.3), 0 2px 15px rgba(0, 0, 0, 0.4);
        }
        
        .gas-btn {
            background: linear-gradient(135deg, var(--success) 0%, #05D98F 100%);
            color: white;
        }
        
        .brake-btn {
            background: linear-gradient(135deg, var(--danger) 0%, #E6285F 100%);
            color: white;
        }
        
        .control-label {
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
            opacity: 0.8;
            font-weight: 700;
        }
        
        /* Pause Button */
        .pause-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.7);
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: white;
            font-size: 24px;
            cursor: pointer;
            z-index: 11;
            pointer-events: all;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
        }
        
        .pause-btn:hover {
            background: rgba(255, 107, 53, 0.8);
            border-color: var(--primary);
            transform: scale(1.1);
        }
        
        /* Screens */
        .screen {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            background: linear-gradient(135deg, rgba(26, 26, 46, 0.98) 0%, rgba(22, 33, 62, 0.98) 100%);
            z-index: 100;
            animation: fadeIn 0.3s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        .screen-content {
            max-width: 800px;
            width: 90%;
            text-align: center;
        }
        
        .title {
            font-family: 'Orbitron', sans-serif;
            font-size: 64px;
            font-weight: 900;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 10px;
            letter-spacing: 3px;
            text-transform: uppercase;
            animation: glow 2s infinite;
        }
        
        @keyframes glow {
            0%, 100% { filter: drop-shadow(0 0 20px rgba(255, 107, 53, 0.5)); }
            50% { filter: drop-shadow(0 0 30px rgba(255, 210, 63, 0.8)); }
        }
        
        .subtitle {
            font-size: 20px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 40px;
            font-weight: 300;
        }
        
        /* Vehicle Selection */
        .vehicle-selection {
            display: flex;
            gap: 20px;
            justify-content: center;
            margin: 30px 0;
            flex-wrap: wrap;
        }
        
        .vehicle-card {
            background: rgba(0, 0, 0, 0.5);
            border: 2px solid rgba(255, 255, 255, 0.2);
            border-radius: 15px;
            padding: 20px;
            width: 200px;
            cursor: pointer;
            transition: all 0.3s;
            position: relative;
        }
        
        .vehicle-card.locked {
            opacity: 0.6;
        }
        
        .vehicle-card.locked .vehicle-lock {
            display: block;
        }
        
        .vehicle-lock {
            display: none;
            position: absolute;
            top: 10px;
            right: 10px;
            font-size: 24px;
            z-index: 1;
        }
        
        .vehicle-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
            box-shadow: 0 10px 30px rgba(255, 107, 53, 0.3);
        }
        
        .vehicle-card.selected {
            border-color: var(--accent);
            background: rgba(255, 210, 63, 0.1);
            box-shadow: 0 0 30px rgba(255, 210, 63, 0.5);
        }
        
        .vehicle-name {
            font-family: 'Orbitron', sans-serif;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--accent);
        }
        
        .vehicle-icon {
            font-size: 48px;
            margin: 15px 0;
        }
        
        .vehicle-stats {
            display: flex;
            flex-direction: column;
            gap: 8px;
            font-size: 12px;
        }
        
        .vehicle-stat {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .stat-bar {
            width: 60%;
            height: 6px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 3px;
            overflow: hidden;
        }
        
        .stat-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
            border-radius: 3px;
        }
        
        /* Buttons */
        .btn {
            padding: 18px 45px;
            font-size: 20px;
            font-family: 'Orbitron', sans-serif;
            font-weight: 700;
            background: linear-gradient(135deg, var(--primary) 0%, #E6522E 100%);
            color: white;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            box-shadow: 0 8px 0 #C23B1C, 0 8px 30px rgba(255, 107, 53, 0.5);
            transition: all 0.1s;
            pointer-events: all;
            letter-spacing: 2px;
            text-transform: uppercase;
            position: relative;
            overflow: hidden;
        }
        
        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
            transition: left 0.5s;
        }
        
        .btn:hover::before {
            left: 100%;
        }
        
        .btn:hover {
            transform: scale(1.05);
        }
        
        .btn:active {
            transform: translateY(6px);
            box-shadow: 0 2px 0 #C23B1C, 0 2px 15px rgba(255, 107, 53, 0.5);
        }
        
        .btn-secondary {
            background: linear-gradient(135deg, var(--secondary) 0%, #003D6E 100%);
            box-shadow: 0 8px 0 #002A4E, 0 8px 30px rgba(0, 78, 137, 0.5);
        }
        
        .btn-secondary:active {
            box-shadow: 0 2px 0 #002A4E, 0 2px 15px rgba(0, 78, 137, 0.5);
        }
        
        /* Game Over Stats */
        .game-over-stats {
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(10px);
            padding: 40px;
            border-radius: 20px;
            margin: 30px 0;
            border: 2px solid rgba(255, 107, 53, 0.3);
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        
        .final-stat {
            text-align: left;
        }
        
        .final-stat-label {
            font-size: 14px;
            opacity: 0.7;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 5px;
        }
        
        .final-stat-value {
            font-family: 'Orbitron', sans-serif;
            font-size: 32px;
            font-weight: 700;
            color: var(--accent);
            text-shadow: 0 0 10px rgba(255, 210, 63, 0.5);
        }
        
        /* Upgrade Menu */
        .upgrade-menu {
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(10px);
            padding: 30px;
            border-radius: 20px;
            margin: 20px 0;
            border: 2px solid rgba(255, 107, 53, 0.3);
            max-width: 600px;
        }
        
        .upgrade-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px;
            margin: 10px 0;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .upgrade-info {
            flex: 1;
        }
        
        .upgrade-name {
            font-family: 'Orbitron', sans-serif;
            font-size: 18px;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 5px;
        }
        
        .upgrade-level {
            font-size: 12px;
            opacity: 0.7;
        }
        
        .upgrade-btn {
            padding: 10px 20px;
            font-size: 14px;
            font-family: 'Orbitron', sans-serif;
            font-weight: 700;
            background: var(--success);
            color: var(--dark);
            border: none;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .upgrade-btn:hover {
            background: #05FFC1;
            transform: scale(1.05);
        }
        
        .upgrade-btn:disabled {
            background: rgba(255, 255, 255, 0.2);
            color: rgba(255, 255, 255, 0.5);
            cursor: not-allowed;
        }
        
        /* Notifications */
        .notification {
            position: absolute;
            top: 120px;
            right: 20px;
            background: rgba(0, 0, 0, 0.9);
            border: 2px solid var(--success);
            border-radius: 10px;
            padding: 15px 25px;
            font-family: 'Orbitron', sans-serif;
            font-size: 18px;
            color: var(--success);
            z-index: 200;
            animation: slideIn 0.5s, slideOut 0.5s 2.5s;
            box-shadow: 0 4px 20px rgba(6, 255, 165, 0.5);
        }
        
        @keyframes slideIn {
            from {
                transform: translateX(400px);
                opacity: 0;
            }
            to {
                transform: translateX(0);
                opacity: 1;
            }
        }
        
        @keyframes slideOut {
            from {
                transform: translateX(0);
                opacity: 1;
            }
            to {
                transform: translateX(400px);
                opacity: 0;
            }
        }
        
        .hidden {
            display: none !important;
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .title { font-size: 42px; }
            .stats-grid { grid-template-columns: 1fr; }
            .game-over-stats { grid-template-columns: 1fr; }
            .controls-container { gap: 50px; }
            .control-btn { width: 70px; height: 70px; font-size: 32px; }
        }