body {
            font-family: 'Segoe UI', Meiryo, sans-serif;
            line-height: 1.8;
            margin: 2em;
            background-color: #fdfdfd;
        }
        .container {
            max-width: 800px;
            margin: 0 auto;
            background-color: #fff;
            padding: 2.5em;
            border-radius: 12px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        h1, h2 {
            color: #2c3e50;
            border-bottom: 2px solid #3498db;
            padding-bottom: 0.4em;
            margin-top: 1.5em;
        }
        .spanish-text {
            color: #34495e;
            background-color: #ecf0f1;
            padding: 1em;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .spanish-text:hover {
            background-color: #e0e6e8;
        }
        strong {
            color: #c0392b;
            font-weight: 600;
        }