

        @import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@300;400;700;900&display=swap');
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Orbitron', monospace;
            background: radial-gradient(ellipse at center, #1a1a2e 0%, #0f0f23 100%);
            color: white;
            overflow-x: hidden;
        }
        
        .stars {
            position: fixed;
            width: 2px;
            height: 2px;
            background: white;
            border-radius: 50%;
            animation: twinkle 3s infinite;
            z-index: 1;
        }
        
        @keyframes twinkle {
            0%, 100% { opacity: 0.3; }
            50% { opacity: 1; }
        }
        
        .container {
            position: relative;
            z-index: 2;
            min-height: 100vh;
            padding: 20px;
        }
        
        .homepage {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .header {
            text-align: center;
            margin-bottom: 50px;
            padding: 40px 0;
        }
        
        .header h1 {
            font-size: 3.5rem;
            font-weight: 900;
            background: linear-gradient(45deg, #00ffff, #0088ff, #ff6600);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 20px;
            text-shadow: 0 0 30px rgba(0, 255, 255, 0.5);
        }
        
        .header p {
            font-size: 1.2rem;
            color: #cccccc;
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }
        
        .game-preview {
            background: rgba(0, 20, 40, 0.8);
            border: 2px solid #00ffff;
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 40px;
            backdrop-filter: blur(10px);
        }
        
        .preview-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            align-items: center;
        }
        
        .preview-text h2 {
            color: #00ffff;
            font-size: 2rem;
            margin-bottom: 20px;
        }
        
        .feature-list {
            list-style: none;
            margin-bottom: 20px;
        }
        
        .feature-list li {
            padding: 8px 0;
            font-size: 1rem;
            color: #cccccc;
        }
        
        .feature-list li:before {
            content: "🚀 ";
            margin-right: 10px;
        }
        
        .preview-visual {
            position: relative;
            height: 300px;
            background: radial-gradient(circle, #001122 0%, #000011 100%);
            border-radius: 10px;
            overflow: hidden;
            border: 1px solid #004466;
        }
        
        .mini-solar-system {
            position: relative;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .mini-sun {
            width: 30px;
            height: 30px;
            background: radial-gradient(circle, #FFD700, #FFA500);
            border-radius: 50%;
            position: absolute;
            box-shadow: 0 0 20px #FFD700;
            animation: pulse 2s infinite;
        }
        
        .mini-planet {
            position: absolute;
            border-radius: 50%;
            animation: orbit 10s linear infinite;
        }
        
        .mini-earth {
            width: 12px;
            height: 12px;
            background: radial-gradient(circle, #4A90E2, #2E5C8A);
            animation: orbit 8s linear infinite;
        }
        
        .mini-mars {
            width: 10px;
            height: 10px;
            background: radial-gradient(circle, #CD5C5C, #8B3A3A);
            animation: orbit 12s linear infinite reverse;
        }
        
        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.1); }
        }
        
        @keyframes orbit {
            from { transform: rotate(0deg) translateX(80px) rotate(0deg); }
            to { transform: rotate(360deg) translateX(80px) rotate(-360deg); }
        }
        
        .customization-section {
            background: rgba(0, 20, 40, 0.8);
            border: 2px solid #00ffff;
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 40px;
            backdrop-filter: blur(10px);
        }
        
        .customization-section h2 {
            color: #00ffff;
            font-size: 2rem;
            margin-bottom: 25px;
            text-align: center;
        }
        
        .planet-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }
        
        .planet-card {
            background: rgba(0, 40, 80, 0.6);
            border: 2px solid transparent;
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
            position: relative;
        }
        
        .planet-card:hover {
            border-color: #00ffff;
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 255, 255, 0.2);
        }
        
        .planet-card.selected {
            border-color: #00ff00;
            background: rgba(0, 80, 40, 0.6);
        }
        
        .planet-card.removed {
            border-color: #ff4444;
            background: rgba(80, 20, 20, 0.6);
            opacity: 0.6;
        }
        
        .planet-visual {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            margin: 0 auto 15px;
            position: relative;
        }
        
        .planet-card h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
            color: #ffffff;
        }
        
        .planet-card p {
            font-size: 0.9rem;
            color: #cccccc;
            line-height: 1.4;
        }
        
        .status-badge {
            position: absolute;
            top: 10px;
            right: 10px;
            padding: 4px 8px;
            border-radius: 12px;
            font-size: 0.7rem;
            font-weight: bold;
        }
        
        .status-included {
            background: #00ff00;
            color: #000;
        }
        
        .status-removed {
            background: #ff4444;
            color: #fff;
        }
        
        .controls-section {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        
        .btn {
            background: linear-gradient(45deg, #0066cc, #00aaff);
            border: none;
            color: white;
            padding: 15px 30px;
            border-radius: 8px;
            cursor: pointer;
            font-family: 'Orbitron', monospace;
            font-size: 1rem;
            font-weight: 700;
            transition: all 0.3s;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        
        .btn:hover {
            background: linear-gradient(45deg, #0088ff, #00ccff);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0, 136, 255, 0.4);
        }
        
        .btn-primary {
            background: linear-gradient(45deg, #ff6600, #ff9900);
            font-size: 1.2rem;
            padding: 20px 40px;
        }
        
        .btn-primary:hover {
            background: linear-gradient(45deg, #ff8800, #ffbb00);
        }
        
        .btn-secondary {
            background: linear-gradient(45deg, #666666, #888888);
        }
        
        .btn-secondary:hover {
            background: linear-gradient(45deg, #888888, #aaaaaa);
        }
        
        .game-container {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            z-index: 1000;
        }
        
        .back-btn {
            position: absolute;
            top: 20px;
            left: 20px;
            z-index: 1001;
            background: rgba(0, 20, 40, 0.9);
            border: 2px solid #00ffff;
            border-radius: 8px;
            padding: 10px 20px;
        }
        
        .info-section {
            background: rgba(0, 20, 40, 0.8);
            border: 2px solid #00ffff;
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 40px;
            backdrop-filter: blur(10px);
        }
        
        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }
        
        .info-card {
            background: rgba(0, 40, 80, 0.6);
            border-left: 4px solid #00ffff;
            padding: 20px;
            border-radius: 8px;
        }
        
        .info-card h3 {
            color: #00ffff;
            margin-bottom: 15px;
            font-size: 1.3rem;
        }
        
        .info-card p {
            color: #cccccc;
            line-height: 1.6;
            margin-bottom: 10px;
        }
        
        /* Mobile and tablet responsive design */
        @media (max-width: 1024px) {
            #controlPanel, #infoPanel {
                width: 240px;
                font-size: 12px;
            }
            
            #speedControls {
                width: 200px;
            }
        }
        
        @media (max-width: 768px) {
            .header h1 {
                font-size: 2.5rem;
            }
            
            .preview-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
            
            .planet-grid {
                grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            }
            
            .controls-section {
                flex-direction: column;
                align-items: center;
            }
            
            /* Mobile game UI adjustments */
            #controlPanel {
                top: 10px;
                left: 10px;
                width: 200px;
                max-height: 50vh;
                padding: 8px;
            }
            
            #infoPanel {
                top: 10px;
                right: 10px;
                width: 200px;
                max-height: 50vh;
                padding: 8px;
            }
            
            #speedControls {
                bottom: 10px;
                left: 10px;
                width: 180px;
                padding: 8px;
            }
            
            #zoomLevel {
                bottom: 10px;
                right: 10px;
                padding: 8px;
                font-size: 11px;
            }
            
            .back-btn {
                top: 10px;
                left: 10px;
                padding: 8px 15px;
                font-size: 12px;
            }
        }
        
        @media (max-width: 480px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .header p {
                font-size: 1rem;
            }
            
            /* Ultra-compact mobile UI */
            #controlPanel, #infoPanel {
                width: 160px;
                max-height: 40vh;
                padding: 6px;
            }
            
            #speedControls {
                width: 140px;
                padding: 6px;
            }
            
            .button {
                padding: 6px 10px;
                font-size: 9px;
                margin: 1px;
            }
            
            /* Hide some panels on very small screens to maximize game area */
            #infoPanel {
                display: none;
            }
            
            #controlPanel {
                max-height: 30vh;
            }
        }
        
        /* Landscape mobile optimization */
        @media (max-height: 500px) and (orientation: landscape) {
            #controlPanel, #infoPanel {
                max-height: 80vh;
                width: 180px;
            }
            
            #speedControls {
                width: 160px;
            }
        }