/* CSS Variables for Colors */
    :root {
        --primary-color: #1A237E;
        --secondary-color: #FFFFFF;
        --accent-color: #FF9800;
        --success-color: #4CAF50;
        --background-gradient: linear-gradient(135deg, #1A237E, #673AB7);
        --card-background: #FFFFFF;
        --card-shadow: rgba(0, 0, 0, 0.1);
        --text-color: #FFFFFF;
        --font-primary: 'Montserrat', sans-serif;
        --font-secondary: 'Poppins', sans-serif;
        --code-background: #F5F5F5;
        --code-color: #333333;
        --link-color: #FF9800;
    }

    /* Global Styles */
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    body {
        background: var(--background-gradient);
        color: var(--text-color);
        font-family: var(--font-primary);
        line-height: 1.6;
        padding: 20px;
    }

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

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

    /* Header Styles */
    header {
        text-align: center;
        padding: 40px 20px;
    }

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

    header p {
        font-size: 1.2rem;
        color: #FFEB3B;
    }

    /* Cards Grid */
    .card-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 20px;
        padding: 20px;
    }

    /* Card Styles */
    .card {
        background-color: var(--card-background);
        border-radius: 12px;
        box-shadow: 0 4px 6px var(--card-shadow);
        padding: 20px;
        display: flex;
        flex-direction: column;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

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

    .card img {
        width: 50px;
        height: 50px;
        margin-bottom: 15px;
    }

    .card h3 {
        font-size: 1.5rem;
        margin-bottom: 10px;
        color: var(--primary-color);
    }

    .card p {
        flex-grow: 1;
        font-size: 1rem;
        color: #555555;
        margin-bottom: 15px;
    }

    .card a.button {
        background-color: var(--success-color);
        color: var(--card-background);
        padding: 10px 15px;
        border-radius: 5px;
        text-align: center;
        transition: background-color 0.3s ease, transform 0.2s ease;
    }

    .card a.button:hover {
        background-color: #43A047;
    }

    .card a.button:active {
        transform: scale(0.95);
    }

    /* 示例数据展示 Section */
    .demo-section {
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 12px;
        padding: 30px;
        margin: 40px 0;
    }

    .demo-section h2 {
        text-align: center;
        font-size: 2rem;
        margin-bottom: 20px;
        color: #FF9800;
    }

    /* 文章样式 */
    article {
        background-color: rgba(255, 255, 255, 0.2);
        border-radius: 12px;
        padding: 30px;
        color: #FFFFFF;
    }

    article h2 {
        font-size: 2rem;
        margin-bottom: 15px;
        color: var(--accent-color);
    }

    article h3 {
        font-size: 1.5rem;
        margin: 20px 0 10px;
        color: var(--accent-color);
    }

    article p {
        font-size: 1rem;
        margin-bottom: 15px;
        color: #ECEFF1;
    }

    article pre {
        background-color: var(--code-background);
        padding: 15px;
        border-radius: 8px;
        overflow-x: auto;
        margin-bottom: 15px;
    }

    article code {
        color: var(--code-color);
        font-family: 'Courier New', Courier, monospace;
    }

    article table {
        width: 100%;
        border-collapse: collapse;
        margin: 20px 0;
    }

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

    article th, article td {
        padding: 10px;
        text-align: left;
        color: #FFFFFF;
    }

    article th {
        background-color: var(--accent-color);
    }

    /* Responsive Design */
    @media (max-width: 1440px) {
        header h1 {
            font-size: 2.2rem;
        }

        article h2 {
            font-size: 1.8rem;
        }
    }

    @media (max-width: 1200px) {
        .card-grid {
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        }

        header h1 {
            font-size: 2rem;
        }

        article h2 {
            font-size: 1.6rem;
        }
    }

    @media (max-width: 1024px) {
        .card-grid {
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        }

        header h1 {
            font-size: 1.8rem;
        }

        article h2 {
            font-size: 1.4rem;
        }
    }

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

        header h1 {
            font-size: 1.6rem;
        }

        article h2 {
            font-size: 1.2rem;
        }
    }

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

        .card {
            padding: 15px;
        }

        article {
            padding: 20px;
        }
    }

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

        .card img {
            width: 40px;
            height: 40px;
        }

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

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

        .card a.button {
            padding: 8px 12px;
            font-size: 0.9rem;
        }
    }