/* 全局样式 */
    body {
        margin: 0;
        padding: 0;
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #002f6c, #004d99);
        color: #ffffff;
    }

    /* 导航栏样式 */
    .navbar {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        background: rgba(0, 0, 0, 0.8);
        display: flex;
        justify-content: center;
        padding: 15px 0;
        z-index: 1000;
    }

    .nav-item {
        margin: 0 15px;
        color: #ffffff;
        text-decoration: none;
        font-size: 16px;
        transition: color 0.3s;
    }

    .nav-item:hover {
        color: #00ff7f;
    }

    /* 封面区样式 */
    .cover {
        height: 100vh;
        background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center;
        background-size: cover;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        text-align: center;
        padding: 0 20px;
    }

    .cover h1 {
        font-family: 'Fira Code', monospace;
        font-size: 48px;
        margin-bottom: 20px;
        animation: fadeIn 2s ease-in-out;
    }

    .cover p {
        font-size: 18px;
        max-width: 600px;
        animation: fadeIn 2s ease-in-out 0.5s;
    }

    /* 简介区样式 */
    .introduction {
        padding: 60px 20px;
        background: rgba(255, 255, 255, 0.1);
        text-align: center;
        animation: fadeIn 1.5s ease-in-out;
    }

    .introduction h2 {
        font-size: 32px;
        margin-bottom: 20px;
    }

    .introduction p {
        font-size: 18px;
        line-height: 1.6;
        max-width: 800px;
        margin: 0 auto;
    }

    /* 研究领域模块样式 */
    .research-fields {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        padding: 60px 20px;
        animation: fadeIn 1.5s ease-in-out;
    }

    .field {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 10px;
        margin: 15px;
        padding: 30px;
        width: 300px;
        text-align: center;
        transition: transform 0.3s, background 0.3s;
    }

    .field:hover {
        transform: scale(1.05);
        background: rgba(0, 255, 127, 0.2);
    }

    .field h3 {
        font-size: 24px;
        margin-bottom: 15px;
    }

    .field p {
        font-size: 16px;
        line-height: 1.5;
    }

    /* 团队展示样式 */
    .team {
        padding: 60px 20px;
        background: rgba(255, 255, 255, 0.05);
        text-align: center;
        animation: fadeIn 1.5s ease-in-out;
    }

    .team h2 {
        font-size: 32px;
        margin-bottom: 30px;
    }

    .members {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .member {
        margin: 15px;
        text-align: center;
    }

    .member img {
        width: 150px;
        height: 150px;
        border-radius: 50%;
        object-fit: cover;
        margin-bottom: 10px;
    }

    .member p {
        font-size: 18px;
    }

    /* 虚拟实验室功能样式 */
    .virtual-lab {
        padding: 60px 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
        animation: fadeIn 1.5s ease-in-out;
    }

    .virtual-lab h2 {
        font-size: 32px;
        margin-bottom: 30px;
    }

    .lab-features {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .feature {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 10px;
        margin: 15px;
        padding: 30px;
        width: 300px;
        text-align: center;
        transition: transform 0.3s, background 0.3s;
    }

    .feature:hover {
        transform: scale(1.05);
        background: rgba(0, 255, 127, 0.2);
    }

    .feature h3 {
        font-size: 24px;
        margin-bottom: 15px;
    }

    .feature p {
        font-size: 16px;
        line-height: 1.5;
    }

    /* 联系表单样式 */
    .contact {
        padding: 60px 20px;
        background: rgba(255, 255, 255, 0.05);
        text-align: center;
        animation: fadeIn 1.5s ease-in-out;
    }

    .contact h2 {
        font-size: 32px;
        margin-bottom: 30px;
    }

    .contact form {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .contact input, .contact textarea {
        width: 80%;
        max-width: 500px;
        padding: 15px;
        margin: 10px 0;
        border: none;
        border-radius: 5px;
        font-size: 16px;
    }

    .contact button {
        padding: 15px 30px;
        border: none;
        border-radius: 5px;
        background: #00ff7f;
        color: #002f6c;
        font-size: 18px;
        cursor: pointer;
        transition: background 0.3s;
    }

    .contact button:hover {
        background: #00e07f;
    }

    /* 示例数据展示样式 */
    .sample-article {
        padding: 60px 20px;
        background: rgba(255, 255, 255, 0.02);
        color: #ffffff;
        animation: fadeIn 1.5s ease-in-out;
    }

    .sample-article h2 {
        font-size: 28px;
        margin-bottom: 20px;
        text-align: center;
    }

    .sample-article p, .sample-article pre {
        font-size: 16px;
        line-height: 1.6;
        max-width: 800px;
        margin: 0 auto 20px auto;
        background: rgba(0, 0, 0, 0.5);
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }

    .sample-article pre {
        font-family: 'Fira Code', monospace;
        background: #1e1e1e;
        color: #d4d4d4;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .cover h1 {
            font-size: 42px;
        }

        .cover p {
            font-size: 17px;
        }
    }

    @media (max-width: 1200px) {
        .field, .feature {
            width: 45%;
        }
    }

    @media (max-width: 1024px) {
        .field, .feature {
            width: 60%;
        }
    }

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

        .field, .feature {
            width: 80%;
        }

        .members {
            flex-direction: column;
            align-items: center;
        }

        .member img {
            width: 120px;
            height: 120px;
        }
    }

    @media (max-width: 480px) {
        .cover h1 {
            font-size: 32px;
        }

        .cover p {
            font-size: 16px;
        }

        .field, .feature {
            width: 100%;
        }

        .contact input, .contact textarea {
            width: 100%;
        }
    }

    @media (max-width: 320px) {
        .cover h1 {
            font-size: 24px;
        }

        .cover p {
            font-size: 14px;
        }

        .nav-item {
            margin: 5px 0;
        }
    }

    /* 动画效果 */
    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }

    /* 提示样式 */
    .reference-note {
        text-align: center;
        padding: 20px;
        font-size: 14px;
        background: rgba(0, 0, 0, 0.7);
    }