:root {
            --bg-color-light: #f4f7f9;
            --card-bg-light: #ffffff;
            --text-color-light: #333333;
            --secondary-text-light: #666666;
            --border-color-light: #e0e0e0;
            --primary-color: #fdaaaa;
            --shadow: rgba(0, 0, 0, 0.1);
            --shadow-hover: rgba(0, 0, 0, 0.15);
        }

        body.dark-mode {
            --bg-color-light: #1a1a2e;
            --card-bg-light: #16213e;
            --text-color-light: #e0e0e0;
            --secondary-text-light: #b0b0b0;
            --border-color-light: #3a3a5a;
            --shadow: rgba(0, 0, 0, 0.4);
            --shadow-hover: rgba(0, 0, 0, 0.5);
        }

        body {
            font-family: Arial, sans-serif;
            background-color: var(--bg-color-light);
            color: var(--text-color-light);
            margin: 0;
            padding: 20px;
            transition: background-color 0.3s, color 0.3s;
        }

        .container {
            max-width: 1200px;
            margin: auto;
            padding: 0 15px; /* Added padding for smaller screens */
        }

        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-color-light);
            margin-bottom: 30px;
        }

        .logo {
            display: flex;
            align-items: center;
        }

        .logo .material-icons {
            font-size: 32px;
            margin-right: 10px;
            color: var(--primary-color);
        }

        .theme-toggle {
            background: var(--card-bg-light);
            border: 1px solid var(--border-color-light);
            border-radius: 50%;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            margin-left: 20px;
            box-shadow: 0 2px 4px var(--shadow);
            transition: box-shadow 0.2s, transform 0.2s;
        }
        
        .theme-toggle:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px var(--shadow-hover);
        }

        .theme-toggle .material-icons {
            font-size: 20px;
            color: var(--text-color-light);
        }

        h1 {
            font-size: clamp(1.5em, 5vw, 2.5em); /* Responsive font size */
            margin: 0;
        }

        h2 {
            font-size: clamp(1.2em, 4vw, 2em);
            margin-top: 0;
            margin-bottom: 25px;
            color: var(--text-color-light);
            text-align: center;
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); /* Use auto-fit for fluid layout */
            gap: 25px;
        }
        
        .card {
            background-color: var(--card-bg-light);
            border: 1px solid var(--border-color-light);
            border-radius: 12px;
            padding: 25px;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 12px var(--shadow-hover);
        }

        .card .card-icon {
            font-size: 48px;
            margin-bottom: 15px;
            color: var(--primary-color);
        }

        .card h3 {
            margin: 0;
            font-size: 1.5em;
        }

        .card p {
            font-size: 1em;
            color: var(--secondary-text-light);
            margin: 5px 0 0;
        }

        /* Modal styling for game messages */
        .modal {
            position: fixed;
            z-index: 1;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.6);
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .modal-content {
            background-color: var(--card-bg-light);
            padding: 30px;
            border-radius: 12px;
            text-align: center;
            max-width: 80%;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .modal h3 {
            margin: 0;
        }
        .modal button {
            margin-top: 20px;
            padding: 10px 20px;
            border: none;
            border-radius: 8px;
            background-color: var(--primary-color);
            color: white;
            cursor: pointer;
        }