/* 全局样式 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    
    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #1e3c72, #2a5298);
        color: #ffffff;
        line-height: 1.6;
        padding: 20px;
    }

    header {
        text-align: center;
        padding: 40px 0;
        background: linear-gradient(45deg, #ff6a00, #ee0979);
        border-radius: 10px;
        margin-bottom: 20px;
    }

    header h1 {
        font-size: 2.5em;
        margin-bottom: 10px;
    }

    header p {
        font-size: 1.2em;
    }

    main {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .section {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
    }

    .section h2 {
        font-size: 1.8em;
        margin-bottom: 15px;
        color: #ffcc00;
    }

    .section p {
        margin-bottom: 15px;
    }

    .section ul, .section ol {
        margin-left: 20px;
        margin-bottom: 15px;
    }

    .section pre {
        background: #333;
        padding: 10px;
        border-radius: 5px;
        overflow-x: auto;
    }

    .section code {
        font-family: 'Fira Code', monospace;
        background: #444;
        padding: 2px 4px;
        border-radius: 3px;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin-bottom: 20px;
    }

    table, th, td {
        border: 1px solid #555;
    }

    th, td {
        padding: 10px;
        text-align: left;
    }

    footer {
        text-align: center;
        padding: 20px 0;
        background: linear-gradient(45deg, #ee0979, #ff6a00);
        border-radius: 10px;
        margin-top: 20px;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        main {
            grid-template-columns: 1fr 1fr;
        }
    }

    @media (max-width: 1200px) {
        main {
            grid-template-columns: 1fr 1fr;
        }
    }

    @media (max-width: 1024px) {
        main {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 768px) {
        main {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 2em;
        }

        .section h2 {
            font-size: 1.5em;
        }
    }

    @media (max-width: 320px) {
        body {
            padding: 10px;
        }

        header {
            padding: 20px 0;
        }
    }

    /* 图片样式 */
    .image-grid {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }

    .image-grid img {
        width: 100%;
        max-width: 150px;
        border-radius: 5px;
    }

    /* 提示样式 */
    .tip {
        text-align: center;
        font-size: 1em;
        margin-top: 20px;
        color: #ffde00;
    }