/* 基本样式 */
    body {
        margin: 0;
        padding: 0;
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #0F4C81, #1E90FF);
        color: #FFFFFF;
        overflow-x: hidden;
    }

    a {
        color: #FFA500;
        text-decoration: none;
        transition: color 0.3s ease, transform 0.3s ease;
    }

    a:hover {
        color: #FF4500;
        transform: scale(1.05);
    }

    h1, h2, h3, h4, h5, h6 {
        font-weight: bold;
        margin: 20px 0 10px 0;
    }

    p {
        line-height: 1.6;
        letter-spacing: 0.5px;
        margin: 10px 0;
    }

    pre {
        background: #2F4F4F;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        color: #FFD700;
    }

    /* 布局 */
    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 20px;
    }

    header {
        text-align: center;
        padding: 60px 20px;
        background: linear-gradient(135deg, #1E90FF, #FFA500);
        border-bottom-left-radius: 50% 20%;
        border-bottom-right-radius: 50% 20%;
    }

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

    header p {
        font-size: 1.2em;
    }

    /* 动态地球模型 */
    .earth-container {
        display: flex;
        justify-content: center;
        align-items: center;
        margin: 40px 0;
    }

    .earth {
        position: relative;
        width: 200px;
        height: 200px;
        background: radial-gradient(circle, #1E90FF, #FFFFFF);
        border-radius: 50%;
        animation: spin 15s infinite linear;
        box-shadow: 0 0 20px rgba(255, 165, 0, 0.5);
    }

    @keyframes spin {
        from { transform: rotate(0deg); }
        to { transform: rotate(360deg); }
    }

    /* 核心功能模块 */
    .features {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-around;
        margin: 40px 0;
    }

    .card {
        background: #FFFFFF;
        color: #000000;
        width: 300px;
        height: 250px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        margin: 20px;
        padding: 20px;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }

    .card:hover {
        transform: scale(1.05);
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    }

    .card img {
        width: 100px;
        height: 100px;
        margin-bottom: 15px;
    }

    .card h3 {
        margin-bottom: 10px;
        color: #0F4C81;
    }

    .card p {
        text-align: center;
        font-size: 0.9em;
    }

    /* 示例展示 */
    .example-display {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
        margin: 40px 0;
    }

    .example-display h2 {
        text-align: center;
        margin-bottom: 20px;
    }

    /* FAQ */
    .faq {
        margin: 40px 0;
    }

    .faq h2 {
        text-align: center;
        margin-bottom: 20px;
    }

    .faq-item {
        background: rgba(255, 165, 0, 0.2);
        padding: 15px;
        border-radius: 5px;
        margin-bottom: 10px;
        cursor: pointer;
        transition: background 0.3s ease;
    }

    .faq-item:hover {
        background: rgba(255, 165, 0, 0.4);
    }

    .faq-item p {
        display: none;
        margin-top: 10px;
    }

    .faq-item.active p {
        display: block;
    }

    /* 提示文字 */
    .note {
        text-align: center;
        font-size: 1em;
        margin: 20px 0;
        color: #FFD700;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .card {
            width: 280px;
            height: 230px;
        }
    }

    @media (max-width: 1200px) {
        .features {
            flex-direction: column;
            align-items: center;
        }
    }

    @media (max-width: 1024px) {
        header {
            padding: 40px 10px;
        }

        header h1 {
            font-size: 2em;
        }

        .earth {
            width: 150px;
            height: 150px;
        }

        .card {
            width: 250px;
            height: 200px;
        }
    }

    @media (max-width: 768px) {
        .earth {
            width: 120px;
            height: 120px;
        }

        .card {
            width: 220px;
            height: 180px;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.5em;
        }

        .earth {
            width: 100px;
            height: 100px;
        }

        .card {
            width: 180px;
            height: 160px;
        }
    }

    @media (max-width: 320px) {
        header h1 {
            font-size: 1.2em;
        }

        .earth {
            width: 80px;
            height: 80px;
        }

        .card {
            width: 150px;
            height: 140px;
        }
    }

    /* 其他样式 */
    footer {
        background: linear-gradient(135deg, #1E90FF, #FFA500);
        color: #FFFFFF;
        text-align: center;
        padding: 20px;
        border-top-left-radius: 50% 20%;
        border-top-right-radius: 50% 20%;
    }

    /* 图片样式 */
    .images-grid {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .images-grid img {
        width: 100px;
        height: 100px;
        margin: 10px;
        border-radius: 10px;
    }

    /* 动画与交互 */
    .button {
        padding: 10px 20px;
        background-color: #0F4C81;
        color: #FFFFFF;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: background-color 0.3s ease, transform 0.3s ease;
        font-size: 1em;
    }

    .button:hover {
        background-color: #FFA500;
        transform: scale(1.1);
    }

    /* 数据可视化图表 */
    .chart {
        width: 100%;
        height: 300px;
        background: #2F4F4F;
        border-radius: 10px;
        margin: 20px 0;
        position: relative;
    }

    .chart::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(to right, #1E90FF, #FFA500);
        opacity: 0.3;
        border-radius: 10px;
    }