:root {
            /* Modern Earthy Color System - Warm & Unique */
            --color-primary: #2D3436;      /* Charcoal */
            --color-primary-light: #636E72;
            --color-secondary: #E17055;    /* Terracotta/Coral */
            --color-accent: #00B894;       /* Mint Green */
            --color-accent-warm: #FDCB6E;  /* Warm Yellow */
            --color-accent-blue: #0984E3;  /* Ocean Blue */
            
            /* Backgrounds */
            --color-bg-dark: #1E272E;
            --color-bg-card: rgba(255, 255, 255, 0.97);
            --color-bg-glass: rgba(255, 255, 255, 0.92);
            
            /* Text */
            --color-text: #2D3436;
            --color-text-secondary: #636E72;
            --color-text-light: #F5F6FA;
            
            /* Gradients - Warm & Natural */
            --gradient-primary: linear-gradient(135deg, #2D3436 0%, #636E72 100%);
            --gradient-warm: linear-gradient(135deg, #E17055 0%, #D63031 100%);
            --gradient-cool: linear-gradient(135deg, #00B894 0%, #00CEC9 100%);
            --gradient-sunset: linear-gradient(135deg, #FDCB6E 0%, #E17055 100%);
            
            /* Shadows - Neutral */
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.05);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.05);
            --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.12), 0 8px 10px -6px rgb(0 0 0 / 0.05);
            --shadow-glow: 0 0 40px rgb(225 112 85 / 0.25);
            
            /* Spacing */
            --space-1: 0.25rem;
            --space-2: 0.5rem;
            --space-3: 0.75rem;
            --space-4: 1rem;
            --space-6: 1.5rem;
            --space-8: 2rem;
            
            /* Transitions */
            --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
            
            /* Border Radius */
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.5rem;
            --radius-2xl: 2rem;
            --radius-full: 9999px;
        }
        
        /* Reset & Base */
        *, *::before, *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        html {
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        body {
            font-family: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--color-bg-dark);
            color: var(--color-text);
            overflow: hidden;
            line-height: 1.6;
        }
        
        /* Game Container */
        #gameContainer {
            position: fixed;
            inset: 0;
            width: 100vw;
            height: 100vh;
        }
        
        /* Loading Screen - Playful */
        #loadingScreen {
            position: fixed;
            inset: 0;
            background: #0a0a0a;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            z-index: 1000;
            transition: opacity 1.2s ease, visibility 1.2s ease;
        }
        
        #loadingScreen::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 50%, rgba(255, 255, 255, 0.02) 0%, transparent 70%);
        }
        
        #loadingScreen.hidden {
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
        }
        
        .loading-content {
            text-align: center;
            color: white;
            position: relative;
            z-index: 1;
            animation: fadeInUp 1s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .loading-logo {
            font-size: 2rem;
            margin-bottom: var(--space-8);
            color: rgba(255, 255, 255, 0.9);
            animation: breathe 4s ease-in-out infinite;
            letter-spacing: 0.5em;
            font-weight: 300;
        }
        
        @keyframes breathe {
            0%, 100% { 
                opacity: 0.4;
                transform: scale(1);
            }
            50% { 
                opacity: 1;
                transform: scale(1.1);
            }
        }
        
        @keyframes glow {
            0%, 100% { 
                filter: drop-shadow(0 0 20px rgba(225, 112, 85, 0.4));
            }
            50% { 
                filter: drop-shadow(0 0 40px rgba(225, 112, 85, 0.8));
            }
        }
        
        .loading-title {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: var(--space-3);
            background: linear-gradient(135deg, #E17055 0%, #00B894 50%, #E17055 100%);
            background-size: 200% 200%;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: gradientShift 3s ease infinite;
            letter-spacing: 2px;
            text-transform: uppercase;
            position: relative;
        }
        
        @keyframes gradientShift {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }
        
        .loading-title::after {
            content: 'KEITH KADIMA';
            position: absolute;
            left: 0;
            right: 0;
            top: 0;
            background: linear-gradient(135deg, #E17055 0%, #00B894 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            opacity: 0.3;
            animation: glitch 5s infinite;
            letter-spacing: 2px;
        }
        
        @keyframes glitch {
            0%, 100% { 
                transform: translate(0); 
                opacity: 0;
            }
            10% { 
                transform: translate(-2px, 2px); 
                opacity: 0.3;
            }
            20% { 
                transform: translate(2px, -2px); 
                opacity: 0;
            }
        }
        
        .loading-subtitle {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: var(--space-8);
            font-family: 'Space Mono', monospace;
            animation: fadeIn 1.5s ease;
            letter-spacing: 1px;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        .loading-bar-container {
            width: 120px;
            height: 1px;
            background: rgba(255, 255, 255, 0.1);
            overflow: hidden;
            position: relative;
        }
        
        .loading-bar {
            height: 100%;
            width: 0%;
            background: rgba(255, 255, 255, 0.8);
            transition: width 0.4s ease-out;
            position: relative;
        }
        
        .loading-bar::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(90deg, 
                transparent, 
                rgba(255,255,255,0.8), 
                transparent);
            animation: shimmer 2s infinite;
        }
        
        @keyframes shimmer {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(200%); }
        }
        
        .loading-tip {
            margin-top: var(--space-8);
            font-size: 0.875rem;
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }
        
        .loading-tip kbd {
            background: rgba(255, 255, 255, 0.1);
            padding: 0.25rem 0.5rem;
            border-radius: var(--radius-sm);
            font-family: 'Space Mono', monospace;
            font-size: 0.75rem;
        }
        
        /* HUD - Controls Panel - Playful Card */
        /* ═══════════════════════════════════════════════════════════
           MODERN GAME HUD - Minimal, Flat, Unobtrusive
           ═══════════════════════════════════════════════════════════ */
        
        #controlsPanel {
            position: fixed;
            top: 20px;
            left: 20px;
            z-index: 100;
            font-family: 'Space Mono', monospace;
            font-size: 11px;
            color: rgba(255, 255, 255, 0.5);
            letter-spacing: 0.05em;
            text-transform: uppercase;
            pointer-events: none;
            opacity: 0.7;
            transition: opacity 0.3s;
        }
        
        #controlsPanel:hover {
            opacity: 1;
        }
        
        #controlsPanel .controls-header,
        #controlsPanel .controls-toggle {
            display: none;
        }
        
        .controls-list {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        
        .control-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .control-key {
            color: rgba(255, 255, 255, 0.8);
            font-weight: 600;
            min-width: 32px;
        }
        
        #controlsPanel.collapsed .controls-list {
            display: none;
        }
        
        /* Mini Map - Minimal circle */
        #miniMap {
            position: fixed;
            top: 20px;
            right: 20px;
            width: 120px;
            height: 120px;
            z-index: 100;
            opacity: 0.7;
            transition: opacity 0.3s ease;
        }
        
        #miniMap:hover {
            opacity: 1;
        }
        
        #miniMap.hidden {
            opacity: 0;
            pointer-events: none;
        }
        
        #miniMapCanvas {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .minimap-label {
            display: none;
        }
        
        /* Speed Display - Modern Game HUD */
        #speedDisplay {
            position: fixed;
            bottom: 24px;
            left: 24px;
            z-index: 100;
            display: flex;
            align-items: baseline;
            gap: 6px;
        }
        
        .speed-value {
            font-family: 'Space Mono', monospace;
            font-size: 2rem;
            font-weight: 700;
            color: rgba(255, 255, 255, 0.9);
            line-height: 1;
        }
        
        .speed-value.fast {
            color: rgba(255, 200, 100, 0.95);
        }
        
        .speed-value.turbo {
            color: rgba(255, 120, 80, 1);
        }
        
        .speed-unit {
            font-family: 'Space Mono', monospace;
            font-size: 10px;
            color: rgba(255, 255, 255, 0.4);
            font-weight: 400;
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }
        
        .speed-boost, .speed-airborne {
            position: fixed;
            bottom: 60px;
            left: 24px;
            font-family: 'Space Mono', monospace;
            font-size: 10px;
            color: rgba(255, 180, 100, 0.9);
            text-transform: uppercase;
            letter-spacing: 0.15em;
            font-weight: 600;
        }
        
        .speed-airborne {
            color: rgba(100, 200, 255, 0.9);
        }
        
        /* Section Indicator - Minimal */
        #sectionIndicator {
            position: fixed;
            bottom: 80px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 100;
            display: none;
            font-family: 'Space Mono', monospace;
            text-align: center;
        }
        
        .section-indicator-content {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .section-indicator-dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: currentColor;
            opacity: 0.8;
        }
        
        .section-indicator-title {
            font-weight: 600;
            font-size: 11px;
            color: rgba(255, 255, 255, 0.8);
            text-transform: uppercase;
            letter-spacing: 0.15em;
        }
        
        .section-indicator-hint {
            font-size: 9px;
            color: rgba(255, 255, 255, 0.4);
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }
        
        /* Modal - Clean & Minimal */
        #modalOverlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.9);
            backdrop-filter: blur(20px);
            z-index: 200;
            display: none;
            align-items: center;
            justify-content: center;
            padding: 40px;
        }
        
        #modalOverlay.active {
            display: flex;
        }
        
        #modal {
            background: rgba(10, 10, 10, 0.98);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 4px;
            max-width: 560px;
            width: 100%;
            max-height: 80vh;
            overflow: hidden;
        }
        
        .modal-header {
            padding: 32px 32px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        
        .modal-title {
            font-family: 'Space Mono', monospace;
            font-size: 12px;
            font-weight: 600;
            color: rgba(255, 255, 255, 0.9);
            display: flex;
            align-items: center;
            gap: 12px;
            text-transform: uppercase;
            letter-spacing: 0.15em;
        }
        
        .modal-title-icon {
            font-size: 1rem;
        }
        
        .modal-close {
            background: transparent;
            border: none;
            cursor: pointer;
            color: rgba(255, 255, 255, 0.4);
            padding: 8px;
            transition: color 0.2s;
            font-size: 18px;
        }
        
        .modal-close:hover {
            color: rgba(255, 255, 255, 0.9);
        }
        
        .modal-body {
            padding: 24px 32px 32px;
            overflow-y: auto;
            max-height: calc(80vh - 100px);
        }
        
        .modal-content {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.7);
        }
        
        .modal-intro {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 24px;
            padding-bottom: 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        
        .modal-section {
            margin-bottom: 24px;
        }
        
        .modal-section:last-child {
            margin-bottom: 0;
        }
        
        .modal-section-title {
            font-family: 'Space Mono', monospace;
            font-size: 10px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.15em;
            color: rgba(255, 255, 255, 0.4);
            margin-bottom: 16px;
        }
        
        .modal-section-title::before {
            display: none;
        }
        
        .modal-list {
            list-style: none;
            display: grid;
            gap: 8px;
        }
        
        .modal-list li {
            padding: 0;
            background: transparent;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.6;
        }
        
        .modal-list li:hover {
            color: rgba(255, 255, 255, 0.9);
        }
        
        .modal-list li::before {
            content: '—';
            color: rgba(255, 255, 255, 0.2);
            font-weight: 400;
        }
        
        .modal-footer {
            padding: 24px 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            justify-content: flex-end;
        }
        
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 20px;
            font-family: 'Space Mono', monospace;
            font-size: 10px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.15em;
            cursor: pointer;
            transition: all 0.2s;
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: transparent;
            color: rgba(255, 255, 255, 0.8);
        }
        
        .btn-primary {
            background: rgba(255, 255, 255, 0.1);
        }
        
        .btn-primary:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: rgba(255, 255, 255, 0.3);
        }
        
        /* Settings Button - Hidden by default, minimal when shown */
        #settingsBtn {
            display: none;
        }
        
        #settingsBtn:hover {
            background: var(--color-bg-card);
            box-shadow: var(--shadow-lg), var(--shadow-glow);
            transform: scale(1.05);
        }
        
        #settingsBtn svg {
            transition: transform 0.5s ease;
        }
        
        #settingsBtn:hover svg {
            transform: rotate(90deg);
        }
        
        /* Settings Panel */
        #settingsPanel {
            position: fixed;
            top: calc(var(--space-4) + 56px);
            right: var(--space-4);
            background: var(--color-bg-card);
            border: 2px solid rgba(99, 102, 241, 0.2);
            border-radius: var(--radius-xl);
            padding: var(--space-4);
            z-index: 100;
            width: 260px;
            display: none;
            box-shadow: var(--shadow-xl);
        }
        
        #settingsPanel.active {
            display: block;
            animation: slideDown 0.3s var(--transition-bounce);
        }
        
        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .settings-title {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: var(--space-4);
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }
        
        .settings-title::before {
            content: '⚙️';
        }
        
        .settings-group {
            margin-bottom: var(--space-4);
        }
        
        .settings-label {
            display: block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--color-text-secondary);
            margin-bottom: var(--space-2);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        
        .settings-select {
            width: 100%;
            padding: var(--space-3);
            font-family: inherit;
            font-size: 0.875rem;
            font-weight: 600;
            border: 2px solid rgba(99, 102, 241, 0.2);
            border-radius: var(--radius-lg);
            background: white;
            color: var(--color-text);
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        
        .settings-select:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
        }
        
        /* FPS Counter */
        #fpsCounter {
            position: fixed;
            bottom: var(--space-4);
            left: calc(var(--space-4) + 180px);
            background: var(--color-bg-glass);
            backdrop-filter: blur(10px);
            padding: var(--space-2) var(--space-3);
            border-radius: var(--radius-lg);
            font-family: 'Space Mono', monospace;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--color-accent);
            border: 1px solid rgba(16, 185, 129, 0.3);
            z-index: 100;
        }
        
        /* ============================================
           MOBILE CONTROLS - Clean Game Style
           ============================================ */
        #mobileControls {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 20px;
            z-index: 100;
            pointer-events: none;
        }
        
        #mobileControls > * {
            pointer-events: auto;
        }
        
        /* Virtual Joystick - Clean dark circle */
        .mobile-joystick {
            position: fixed;
            left: 20px;
            bottom: 25px;
            width: 120px;
            height: 120px;
            background: rgba(0, 0, 0, 0.5);
            border-radius: 50%;
            border: 3px solid rgba(255, 255, 255, 0.3);
            touch-action: none;
        }
        
        .mobile-joystick-inner {
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 50%;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
            transition: transform 0.05s ease-out;
        }
        
        /* Action Buttons - Right side, bigger and bolder */
        .mobile-buttons {
            position: fixed;
            right: 15px;
            bottom: 25px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        
        .mobile-btn {
            width: 72px;
            height: 72px;
            border: none;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: white;
            touch-action: manipulation;
            -webkit-tap-highlight-color: transparent;
            user-select: none;
            font-weight: bold;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
            transition: transform 0.1s ease;
        }
        
        .mobile-btn:active {
            transform: scale(0.9);
        }
        
        /* Boost Button - Solid Orange */
        .mobile-boost {
            background: #ff6b4a;
        }
        
        /* Jump Button - Solid Green */
        .mobile-jump {
            background: #22c55e;
        }
        
        /* Action/Enter Button - Solid Blue */
        .mobile-action {
            background: #3b82f6;
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            #controlsPanel {
                display: none;
            }
            
            #mobileControls {
                display: block;
            }
            
            #speedDisplay {
                bottom: 180px;
                left: 50%;
                transform: translateX(-50%);
            }
            
            #miniMap {
                top: 10px;
                right: 10px;
                width: 100px;
                height: 100px;
            }
            
            #modal {
                max-height: 90vh;
                margin: 10px;
            }
            
            .modal-body {
                max-height: calc(90vh - 180px);
            }
            
            #fpsCounter {
                left: 10px;
                bottom: calc(var(--space-4) + 100px);
            }
        }
        
        /* Notification Toast - Achievement Style */
        #notificationToast {
            position: fixed;
            top: 40px;
            left: 50%;
            transform: translateX(-50%) translateY(-60px);
            z-index: 150;
            display: flex;
            align-items: center;
            gap: 12px;
            opacity: 0;
            transition: transform 0.5s ease, opacity 0.3s ease;
            pointer-events: none;
            font-family: 'Space Mono', monospace;
        }
        
        #notificationToast.show {
            transform: translateX(-50%) translateY(0);
            opacity: 1;
        }
        
        .toast-icon {
            font-size: 1rem;
        }
        
        .toast-content {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        
        .toast-title {
            font-weight: 600;
            font-size: 11px;
            color: rgba(255, 255, 255, 0.9);
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }
        
        .toast-subtitle {
            font-size: 10px;
            color: rgba(255, 255, 255, 0.5);
            letter-spacing: 0.05em;
        }
        
        /* Tutorial Overlay */
        #tutorialOverlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.95);
            z-index: 250;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }
        
        #tutorialOverlay.active {
            opacity: 1;
            visibility: visible;
        }
        
        .tutorial-content {
            text-align: center;
            color: white;
            max-width: 500px;
            padding: var(--space-6);
        }
        
        .tutorial-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: var(--space-4);
            background: var(--gradient-primary);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .tutorial-subtitle {
            font-size: 1.125rem;
            color: var(--color-text-secondary);
            margin-bottom: var(--space-8);
        }
        
        .tutorial-keys {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: var(--space-6);
            margin-bottom: var(--space-8);
        }
        
        .tutorial-key-group {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: var(--space-2);
        }
        
        .tutorial-key {
            display: flex;
            gap: var(--space-1);
        }
        
        .tutorial-key kbd {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 3rem;
            height: 3rem;
            background: rgba(255, 255, 255, 0.1);
            border: 2px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-lg);
            font-family: 'Space Mono', monospace;
            font-size: 1rem;
            font-weight: 700;
            color: white;
            transition: all 0.2s ease;
        }
        
        .tutorial-key kbd:hover {
            background: var(--gradient-primary);
            border-color: transparent;
            transform: translateY(-2px);
        }
        
        .tutorial-key-label {
            font-size: 0.875rem;
            color: var(--color-text-secondary);
        }
        
        .tutorial-start-btn {
            background: var(--gradient-primary);
            color: white;
            border: none;
            padding: var(--space-4) var(--space-8);
            font-family: inherit;
            font-size: 1.125rem;
            font-weight: 700;
            border-radius: var(--radius-full);
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 4px 0 rgba(99, 102, 241, 0.4);
        }
        
        .tutorial-start-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 0 rgba(99, 102, 241, 0.4);
        }
        
        .tutorial-start-btn:active {
            transform: translateY(0);
            box-shadow: 0 2px 0 rgba(99, 102, 241, 0.4);
        }
        
        .tutorial-skip {
            margin-top: var(--space-4);
            background: none;
            border: none;
            color: var(--color-text-secondary);
            font-family: inherit;
            font-size: 0.875rem;
            cursor: pointer;
            text-decoration: underline;
            transition: color 0.2s ease;
        }
        
        .tutorial-skip:hover {
            color: white;
        }
        
        /* Screen Effects */
        #screenEffects {
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: 50;
        }
        
        .screen-shake {
            animation: shake 0.3s ease-out;
        }
        
        @keyframes shake {
            0%, 100% { transform: translate(0, 0); }
            10% { transform: translate(-5px, -5px); }
            20% { transform: translate(5px, 5px); }
            30% { transform: translate(-5px, 5px); }
            40% { transform: translate(5px, -5px); }
            50% { transform: translate(-3px, -3px); }
            60% { transform: translate(3px, 3px); }
            70% { transform: translate(-2px, 2px); }
            80% { transform: translate(2px, -2px); }
            90% { transform: translate(-1px, 1px); }
        }
        
        /* Boost Lines Effect */
        .boost-lines {
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: 45;
            opacity: 0;
            transition: opacity 0.3s ease;
            overflow: hidden;
        }
        
        .boost-lines.active {
            opacity: 1;
        }
        
        /* ⚡ GAME FEEL: Enhanced speed lines with radial blur effect */
        .boost-lines::before {
            content: '';
            position: absolute;
            inset: -20%;
            background: 
                repeating-conic-gradient(
                    from 0deg at 50% 50%,
                    transparent 0deg,
                    rgba(255, 200, 100, 0.03) 1deg,
                    transparent 2deg,
                    transparent 10deg
                );
            animation: spinLines 2s linear infinite;
        }
        
        .boost-lines::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(
                ellipse 80% 50% at 50% 50%,
                transparent 30%,
                rgba(255, 150, 50, 0.15) 70%,
                rgba(255, 100, 0, 0.3) 100%
            );
            animation: pulseGlow 0.5s ease-in-out infinite alternate;
        }
        
        @keyframes spinLines {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        @keyframes pulseGlow {
            0% { opacity: 0.6; transform: scale(1); }
            100% { opacity: 1; transform: scale(1.02); }
        }
        
        /* Speed streaks overlay */
        .boost-lines .streak {
            position: absolute;
            width: 100px;
            height: 2px;
            background: linear-gradient(90deg, transparent, rgba(255, 200, 100, 0.8), transparent);
            animation: streakMove 0.4s linear infinite;
        }
        
        @keyframes streakMove {
            from { transform: translateX(-100vw); opacity: 0; }
            50% { opacity: 1; }
            to { transform: translateX(100vw); opacity: 0; }
        }
        
        /* Progress Bar for Section Entry */
        #progressBar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: rgba(99, 102, 241, 0.2);
            z-index: 100;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        #progressBar.active {
            opacity: 1;
        }
        
        #progressBarFill {
            height: 100%;
            width: 0%;
            background: var(--gradient-primary);
            transition: width 0.1s linear;
        }
        
        /* Accessibility */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }
        
        :focus-visible {
            outline: 3px solid var(--color-primary);
            outline-offset: 2px;
        }