/* 全局样式 */
    :root {
        --primary-font: 'Inter', sans-serif;
        --secondary-font: 'Arial', sans-serif;
        --background-gradient: radial-gradient(circle at top right, #ff5722, transparent);
        --button-gradient: linear-gradient(to right, #007bff, #00c6ff);
        --text-color: #333;
        --heading-color: #ffffff;
        --card-background: #f9f9f9;
        --accent-color: #00c6ff;
        --container-padding: 20px;
    }

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

    body {
        font-family: var(--primary-font);
        color: var(--text-color);
        background: var(--background-gradient);
        animation: backgroundMove 15s linear infinite;
        line-height: 1.6;
    }

    @keyframes backgroundMove {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    header {
        background: rgba(0, 0, 0, 0.7);
        padding: var(--container-padding);
        text-align: center;
        color: var(--heading-color);
    }

    header h1 {
        font-size: 2.5rem;
        font-weight: bold;
    }

    nav {
        margin-top: 15px;
    }

    nav a {
        color: var(--heading-color);
        text-decoration: none;
        margin: 0 10px;
        font-weight: 500;
        transition: color 0.3s ease;
    }

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

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: var(--container-padding);
    }

    .grid-container {
        display: grid;
        grid-template-columns: repeat(12, 1fr);
        gap: 20px;
    }

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

    .module-card:hover {
        transform: scale(1.05);
        background-color: #e0f7fa;
    }

    h2, h3, h4 {
        color: var(--heading-color);
        margin-bottom: 15px;
    }

    p {
        margin-bottom: 15px;
    }

    ul {
        list-style-type: disc;
        margin-left: 20px;
        margin-bottom: 15px;
    }

    pre {
        background-color: #272727;
        color: #f8f8f2;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        font-family: 'Courier New', Courier, monospace;
        margin-bottom: 15px;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        background-color: #f1f1f1;
        padding: 2px 4px;
        border-radius: 4px;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin-bottom: 15px;
    }

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

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

    th {
        background-color: #f2f2f2;
    }

    .highlight {
        background: var(--button-gradient);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    .button {
        display: inline-block;
        padding: 10px 20px;
        background: var(--button-gradient);
        color: #fff;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: transform 0.3s ease, background-color 0.3s ease;
        text-decoration: none;
        font-weight: bold;
    }

    .button:hover {
        transform: scale(1.05);
        background-color: #00c6ff;
    }

    .parallax {
        position: relative;
        overflow: hidden;
        height: 400px;
        background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center;
        background-size: cover;
        transform: translateY(0);
        transition: transform 0.5s ease;
    }

    .parallax:hover {
        transform: translateY(-20px);
    }

    @media (max-width: 1440px) {
        .grid-container {
            grid-template-columns: repeat(12, 1fr);
        }
    }

    @media (max-width: 1200px) {
        .grid-container {
            grid-template-columns: repeat(12, 1fr);
        }
    }

    @media (max-width: 1024px) {
        .grid-container {
            grid-template-columns: repeat(12, 1fr);
        }
    }

    @media (max-width: 768px) {
        .module-card {
            grid-column: span 6;
        }
    }

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

        .grid-container {
            grid-template-columns: repeat(6, 1fr);
        }

        .module-card {
            grid-column: span 6;
        }
    }

    @media (max-width: 320px) {
        header h1 {
            font-size: 1.5rem;
        }

        .grid-container {
            grid-template-columns: repeat(2, 1fr);
        }

        .module-card {
            grid-column: span 2;
        }
    }

    .responsive-image {
        width: 100%;
        height: auto;
        border-radius: 5px;
        margin-bottom: 15px;
    }

    footer {
        background: rgba(0, 0, 0, 0.7);
        color: var(--heading-color);
        text-align: center;
        padding: 20px;
        margin-top: 40px;
    }

    .decorative-images {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 20px;
    }

    .decorative-images img {
        width: 80px;
        height: 80px;
        object-fit: cover;
        border-radius: 5px;
        flex: 1 1 80px;
    }