:root {
            --primary-color: #3498db;
            --secondary-color: #2ecc71;
            --accent-color: #e74c3c;
            --text-color: #f5f5f5;
            --bg-color: #121212;
            --panel-bg: #202020;
            --card-bg: #2a2a2a;
            --panel-border: #3a3a3a;
            --hover-bg: #333333;
            
            --light-primary-color: #2196F3;
            --light-secondary-color: #27ae60;
            --light-accent-color: #e74c3c;
            --light-text-color: #333333;
            --light-bg-color: #f5f5f5;
            --light-panel-bg: #ffffff;
            --light-card-bg: #f0f0f0;
            --light-panel-border: #e0e0e0;
            --light-hover-bg: #e0e0e0;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
            padding: 0;
            transition: background-color 0.3s, color 0.3s;
        }
        
        body.light-theme {
            --primary-color: var(--light-primary-color);
            --secondary-color: var(--light-secondary-color);
            --accent-color: var(--light-accent-color);
            --text-color: var(--light-text-color);
            --bg-color: var(--light-bg-color);
            --panel-bg: var(--light-panel-bg);
            --card-bg: var(--light-card-bg);
            --panel-border: var(--light-panel-border);
            --hover-bg: var(--light-hover-bg);
        }
        
        .main-tile {
            position: relative;
            height: 500px;
            overflow: hidden;
            margin-bottom: 1px;
        }
        
        .main-tile a {
            display: block;
            height: 100%;
            text-decoration: none;
            color: white;
        }
        
        .main-tile-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .main-tile-gradient {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, rgba(0,0,0,0.1), rgba(0,0,0,0.7));
        }
        
        .main-tile-content {
            position: absolute;
            bottom: 90px;
            left: 0;
            width: 100%;
            padding: 0 50px;
            z-index: 2;
        }
        
        .main-tile-content h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            font-weight: 600;
        }
        
        .main-tile-content p {
            font-size: 1.1rem;
            margin-bottom: 25px;
            max-width: 600px;
        }
        
        .main-tile-button {
            display: inline-block;
            padding: 10px 25px;
            background-color: transparent;
            color: white;
            border: 2px solid white;
            text-transform: uppercase;
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 1px;
            transition: background-color 0.3s, color 0.3s;
        }
        
        .main-tile-button:hover {
            background-color: white;
            color: #000;
        }
        
        .navigation-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2px;
            background-color: var(--panel-border);
        }
        
        .navigation-item {
            position: relative;
            height: 250px;
            overflow: hidden;
            background-color: var(--panel-bg);
        }
        
        .navigation-item a {
            display: block;
            height: 100%;
            text-decoration: none;
            color: white;
            background-color: var(--panel-bg);
        }
        
        .navigation-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
            opacity: 0.7;
        }
        
        .navigation-item:hover .navigation-image {
            transform: scale(1.05);
            opacity: 0.8;
        }
        
        .navigation-gradient {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, rgba(32, 32, 32, 0.1), rgba(32, 32, 32, 0.9));
            background-color: rgba(32, 32, 32, 0.2);
        }
        
        .navigation-content {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            padding: 30px 20px;
            z-index: 2;
        }
        
        .navigation-content h3 {
            font-size: 1.3rem;
            margin-bottom: 10px;
            font-weight: 600;
        }
        
        .navigation-content p {
            font-size: 0.9rem;
            opacity: 0.9;
        }
        
        .navigation-item-large {
            grid-column: span 2;
        }
        
        @media (max-width: 992px) {
            .navigation-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .navigation-item-large {
                grid-column: span 1;
            }
        }
        
        @media (max-width: 768px) {
            .main-tile {
                height: 400px;
            }
            
            .main-tile-content {
                padding: 0 30px;
                bottom: 60px;
            }
            
            .main-tile-content h1 {
                font-size: 2rem;
            }
            
            .main-tile-content p {
                font-size: 1rem;
            }
            
            .navigation-item {
                height: 200px;
            }
        }
        
        @media (max-width: 576px) {
            .main-tile-content h1 {
                font-size: 1.8rem;
            }
            
            .navigation-grid {
                grid-template-columns: 1fr;
                gap: 0;
            }
            
            .navigation-item-large {
                grid-column: span 1;
                height: 200px;
            }
            
            .navigation-item {
                height: 200px;
            }
        }