h1 {
            text-align: center;
            margin-bottom: 20px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }
        .regions {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }
        .region {
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 15px;
        }
        .region h2 {
            font-size: 18px;
            margin-top: 0;
            margin-bottom: 10px;
            border-bottom: 1px solid #ffff00;
            padding-bottom: 5px;
        }
        .countries {
            columns: 2;
            padding: 0;
        }
        .countries li {
            list-style: none;
            margin-bottom: 1px;
        }
        .countries a {
            color: #000000;
            text-decoration: none;
            display: block;
            padding: 5px;
            border-radius: 4px;
            transition: background-color 0.3s;
        }
        .countries a:hover {
            background-color: rgba(255, 255, 0, 0.2);
            cursor: pointer;
        }
        /* 响应式布局 */
        @media (max-width: 768px) {
            .regions {
                grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            }
        }