/* 全局样式 */
    body {
        margin: 0;
        padding: 0;
        font-family: 'Roboto', 'Open Sans', sans-serif;
        background-color: #F5F5F5;
        color: #333;
    }

    /* 渐变背景动画 */
    @keyframes aurora-move {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    .header {
        background: linear-gradient(135deg, #0074D9, #6FCF97);
        background-size: 400% 400%;
        animation: aurora-move 15s linear infinite;
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
        color: #FFD700;
        text-align: center;
    }

    .header::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: url('https://images.gptkong.com/demo/sample1.png') center center / cover no-repeat;
        opacity: 0.3;
    }

    .header h1 {
        z-index: 1;
        font-size: 2.5em;
        font-weight: bold;
    }

    .section {
        padding: 60px 20px;
        max-width: 1200px;
        margin: 0 auto;
    }

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

    .service-item {
        background: #ffffff;
        border-radius: 8px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        padding: 20px;
        text-align: center;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .service-item:hover {
        transform: translateY(-10px);
        box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    }

    .service-item img {
        width: 60px;
        height: 60px;
        margin-bottom: 15px;
    }

    .service-item h3 {
        font-size: 1.2em;
        margin-bottom: 10px;
        color: #0074D9;
    }

    .service-item p {
        font-size: 0.95em;
        color: #666;
    }

    .article-section {
        background: #ffffff;
        padding: 40px;
        border-radius: 8px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        margin-top: 40px;
    }

    .article-section h2 {
        font-size: 2em;
        margin-bottom: 20px;
        color: #0074D9;
    }

    .article-section h3 {
        font-size: 1.5em;
        margin-top: 30px;
        color: #6FCF97;
    }

    .article-section h4 {
        font-size: 1.2em;
        margin-top: 20px;
        color: #FFA500;
    }

    .article-section p {
        font-size: 1em;
        line-height: 1.6;
        margin-bottom: 20px;
        color: #333;
    }

    .article-section ul {
        list-style: disc inside;
        margin-bottom: 20px;
    }

    .article-section table {
        width: 100%;
        border-collapse: collapse;
        margin-bottom: 20px;
    }

    .article-section table, .article-section th, .article-section td {
        border: 1px solid #ddd;
    }

    .article-section th, .article-section td {
        padding: 12px;
        text-align: left;
    }

    .article-section th {
        background-color: #0074D9;
        color: white;
    }

    pre {
        background: #f0f0f0;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        font-size: 0.95em;
        line-height: 1.5;
    }

    code {
        font-family: 'Source Code Pro', monospace;
        color: #C7254E;
    }

    .footer {
        background: #0074D9;
        color: #ffffff;
        text-align: center;
        padding: 20px;
        position: relative;
    }

    .footer::before {
        content: "";
        position: absolute;
        top: 0;
        left: 50%;
        width: 100%;
        height: 5px;
        background: linear-gradient(90deg, #FFD700, #6FCF97, #0074D9);
        transform: translateX(-50%);
    }

    /* 按钮样式 */
    .button {
        background-color: #6FCF97;
        color: white;
        border: none;
        padding: 10px 20px;
        border-radius: 4px;
        cursor: pointer;
        transition: all 0.3s ease;
        text-decoration: none;
        display: inline-block;
    }

    .button:hover {
        background-color: #0074D9;
    }

    .button:active {
        transform: translateY(2px);
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .header h1 {
            font-size: 2em;
        }
    }

    @media (max-width: 1200px) {
        .header h1 {
            font-size: 1.8em;
        }
    }

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

    @media (max-width: 768px) {
        .header {
            height: 70vh;
        }

        .header h1 {
            font-size: 1.5em;
        }

        .services {
            grid-template-columns: 1fr;
        }

        .article-section {
            padding: 20px;
        }
    }

    @media (max-width: 480px) {
        .header h1 {
            font-size: 1.2em;
        }

        .service-item img {
            width: 50px;
            height: 50px;
        }

        .article-section h2 {
            font-size: 1.5em;
        }

        .article-section h3 {
            font-size: 1.2em;
        }

        .article-section h4 {
            font-size: 1em;
        }
    }

    @media (max-width: 320px) {
        .header {
            height: 60vh;
        }

        .header h1 {
            font-size: 1em;
        }

        .service-item img {
            width: 40px;
            height: 40px;
        }

        .button {
            padding: 8px 16px;
            font-size: 0.9em;
        }
    }