/* 基础样式 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #0D47A1, #6A1B9A);
        color: #FFFFFF;
        line-height: 1.6;
        padding: 20px;
    }

    a {
        color: #FF9800;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    a:hover {
        color: #FF5722;
    }

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

    /* 头部 */
    header {
        text-align: center;
        margin-bottom: 40px;
    }

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

    header p {
        font-size: 1.2em;
        color: #FFD54F;
    }

    /* 导航栏 */
    nav {
        display: flex;
        justify-content: center;
        margin-bottom: 40px;
    }

    nav a {
        margin: 0 15px;
        font-size: 1em;
        padding: 10px 15px;
        border-radius: 4px;
        transition: background-color 0.3s ease, transform 0.3s ease;
    }

    nav a:hover {
        background-color: rgba(255, 255, 255, 0.2);
        transform: scale(1.05);
    }

    /* 主内容 */
    main {
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
    }

    /* 卡片样式 */
    .card {
        background: #FFFFFF;
        color: #0D47A1;
        border-radius: 8px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        padding: 20px;
        flex: 1 1 calc(33.333% - 40px);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        position: relative;
    }

    .card:hover {
        transform: scale(1.05);
        box-shadow: 0 8px 12px rgba(0,0,0,0.2);
    }

    .card h3 {
        margin-bottom: 15px;
        font-size: 1.5em;
        color: #6A1B9A;
    }

    .card p {
        margin-bottom: 10px;
        font-size: 1em;
    }

    .card a {
        position: absolute;
        bottom: 20px;
        right: 20px;
        background-color: #43A047;
        color: #FFFFFF;
        padding: 8px 12px;
        border-radius: 4px;
        transition: background-color 0.3s ease;
    }

    .card a:hover {
        background-color: #388E3C;
    }

    /* 示范展示 */
    .sample-display {
        width: 100%;
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 8px;
        margin-top: 40px;
    }

    .sample-display h2 {
        font-size: 2em;
        margin-bottom: 20px;
        color: #FFD54F;
    }

    .sample-display article {
        background: #FFFFFF;
        color: #0D47A1;
        padding: 20px;
        border-radius: 8px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .sample-display pre {
        background: #F5F5F5;
        color: #424242;
        padding: 15px;
        border-radius: 4px;
        overflow-x: auto;
        font-size: 0.9em;
        margin-bottom: 20px;
    }

    .sample-display code {
        font-family: 'Courier New', Courier, monospace;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .card {
            flex: 1 1 calc(25% - 40px);
        }
    }

    @media (max-width: 1200px) {
        .card {
            flex: 1 1 calc(33.333% - 40px);
        }
    }

    @media (max-width: 1024px) {
        .card {
            flex: 1 1 calc(50% - 40px);
        }
    }

    @media (max-width: 768px) {
        nav {
            flex-direction: column;
        }

        nav a {
            margin: 10px 0;
        }

        .card {
            flex: 1 1 100%;
        }
    }

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

        .card h3 {
            font-size: 1.2em;
        }

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

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

        header h1 {
            font-size: 1.5em;
        }

        nav a {
            padding: 8px 10px;
            font-size: 0.9em;
        }

        .sample-display h2 {
            font-size: 1.5em;
        }
    }

    /* 动画效果 */
    @keyframes aurora-move {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    .animated-background {
        background: radial-gradient(circle, rgb(255, 87, 34), transparent);
        animation: aurora-move 15s linear infinite;
    }

    /* 按钮样式 */
    .btn {
        display: inline-block;
        background-color: #FB8C00;
        color: #FFFFFF;
        padding: 10px 20px;
        border-radius: 4px;
        transition: background-color 0.3s ease, transform 0.3s ease;
    }

    .btn:hover {
        background-color: #F57C00;
        transform: translateY(-2px);
    }

    /* 提示信息 */
    .notice {
        text-align: center;
        font-size: 1em;
        margin-top: 30px;
        color: #FFD54F;
    }

    /* 图像样式 */
    .card img {
        width: 100%;
        height: auto;
        border-radius: 4px;
        margin-bottom: 15px;
    }

    /* 表格样式 */
    table {
        width: 100%;
        border-collapse: collapse;
        margin: 20px 0;
    }

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

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

    th {
        background-color: #E0E0E0;
        color: #0D47A1;
    }

    /* 数据可视化样式 */
    .bar-chart {
        display: flex;
        justify-content: space-between;
        align-items: flex-end;
        height: 200px;
        margin-top: 20px;
    }

    .bar {
        width: 20%;
        background-color: #43A047;
        border-radius: 4px 4px 0 0;
        transition: height 0.5s ease;
    }

    .bar:hover {
        background-color: #388E3C;
    }

    .loader {
        border: 4px solid #F5F5F5;
        border-top: 4px solid #FB8C00;
        border-radius: 50%;
        width: 40px;
        height: 40px;
        animation: spin 1s linear infinite;
        margin: 20px auto;
    }

    @keyframes spin {
        0% { transform: rotate(0deg); }
        100% { transform: rotate(360deg); }
    }