/* 全局变量 */
    :root {
        --primary-color: #0F4C81;
        --secondary-color: #F5F7FA;
        --accent-color: #FFA726;
        --text-color: #333333;
        --background-gradient: radial-gradient(circle, rgba(255,87,34,0.8), transparent);
        --font-family: 'Roboto', sans-serif;
    }

    /* 全局样式 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: var(--font-family);
        background-color: var(--secondary-color);
        color: var(--text-color);
        line-height: 1.6;
    }

    a {
        color: var(--primary-color);
        text-decoration: none;
        transition: color 0.3s ease;
    }

    a:hover {
        color: var(--accent-color);
    }

    header {
        background: var(--primary-color);
        color: white;
        padding: 20px;
        text-align: center;
        position: relative;
        overflow: hidden;
    }

    header::after {
        content: '';
        position: absolute;
        top: 0;
        left: 50%;
        width: 300%;
        height: 100%;
        background: var(--background-gradient);
        transform: translateX(-50%);
        animation: aurora-move 15s linear infinite;
        z-index: 0;
    }

    header h1 {
        position: relative;
        z-index: 1;
        font-size: 2em;
    }

    main {
        padding: 20px;
        max-width: 1200px;
        margin: 0 auto;
    }

    .container {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }

    .card {
        background-color: white;
        border-radius: 8px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        padding: 20px;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 10px 15px rgba(0,0,0,0.2);
    }

    .card img {
        width: 100%;
        border-radius: 8px;
        margin-bottom: 15px;
    }

    article {
        background-color: #ffffff;
        padding: 20px;
        border-radius: 8px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        margin-bottom: 40px;
    }

    article h2, article h3 {
        color: var(--primary-color);
        margin-bottom: 10px;
    }

    pre {
        background-color: #f0f0f0;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 15px;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        color: #d14;
    }

    .sample-data {
        background-color: #fff9e6;
        padding: 20px;
        border-left: 4px solid var(--accent-color);
        margin-bottom: 40px;
        border-radius: 5px;
    }

    .sample-data h3 {
        color: var(--accent-color);
        margin-bottom: 10px;
    }

    .sample-data ul {
        list-style: disc inside;
    }

    footer {
        text-align: center;
        padding: 20px;
        background-color: var(--primary-color);
        color: white;
        position: relative;
    }

    footer::after {
        content: '';
        position: absolute;
        top: 0;
        left: 50%;
        width: 300%;
        height: 100%;
        background: var(--background-gradient);
        transform: translateX(-50%);
        animation: aurora-move 15s linear infinite;
        z-index: 0;
    }

    footer p {
        position: relative;
        z-index: 1;
        font-size: 1em;
    }

    @keyframes aurora-move {
        0% { transform: translateX(-50%) rotate(0deg); }
        100% { transform: translateX(-50%) rotate(360deg); }
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        header h1 {
            font-size: 1.8em;
        }
    }

    @media (max-width: 1200px) {
        .container {
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        }
    }

    @media (max-width: 1024px) {
        header h1 {
            font-size: 1.6em;
        }
    }

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

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.4em;
        }

        article, .sample-data {
            padding: 15px;
        }
    }

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

        main {
            padding: 10px;
        }
    }