/* 导入字体 */
    @import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600&family=Roboto+Slab:wght@700&display=swap');

    /* 通用样式 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Open Sans', sans-serif;
        background: linear-gradient(135deg, #0B132B, #A6ACAF);
        color: #FFFFFF;
        line-height: 1.6;
    }

    h1, h2, h3, h4 {
        font-family: 'Roboto Slab', serif;
        margin-bottom: 20px;
    }

    h1 {
        font-size: 3em;
        color: #4CAF50;
        text-align: center;
        margin-top: 50px;
        text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    }

    h2 {
        font-size: 2em;
        color: #FFFFFF;
        margin-top: 40px;
    }

    h3 {
        font-size: 1.5em;
        color: #A6ACAF;
        margin-top: 30px;
    }

    p {
        font-size: 1em;
        margin-bottom: 15px;
        padding: 0 20px;
    }

    a {
        color: #4CAF50;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    a:hover {
        color: #A6ACAF;
    }

    /* 导航栏 */
    .navbar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 50px;
        background: rgba(11, 19, 43, 0.9);
        position: fixed;
        width: 100%;
        top: 0;
        z-index: 1000;
    }

    .navbar .logo {
        font-size: 1.5em;
        font-weight: bold;
    }

    .navbar ul {
        list-style: none;
        display: flex;
    }

    .navbar ul li {
        margin-left: 30px;
    }

    .navbar ul li a {
        font-size: 1em;
        transition: color 0.3s ease;
    }

    /* 首页横幅 */
    .banner {
        height: 100vh;
        background: url('https://images.gptkong.com/demo/sample1.png') center center/cover no-repeat;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
    }

    .banner h1 {
        font-size: 3em;
        color: #FFFFFF;
        margin-bottom: 20px;
        animation: fadeInDown 2s ease;
    }

    .banner .enter-button {
        padding: 15px 30px;
        background: #4CAF50;
        border: none;
        border-radius: 5px;
        color: #FFFFFF;
        font-size: 1.2em;
        cursor: pointer;
        transition: transform 0.3s ease, background-color 0.3s ease;
        animation: fadeInUp 2s ease;
    }

    .banner .enter-button:hover {
        transform: scale(1.1);
        background: #A6ACAF;
    }

    @keyframes fadeInDown {
        from {
            opacity: 0;
            transform: translateY(-50px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(50px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* 内容区 */
    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 80px 20px 40px 20px;
    }

    /* 模块卡片 */
    .modules {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 30px;
        margin-top: 40px;
    }

    .module {
        background: rgba(166, 172, 175, 0.2);
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        transition: transform 0.3s ease, background 0.3s ease;
    }

    .module:hover {
        transform: translateY(-10px);
        background: rgba(166, 172, 175, 0.4);
    }

    .module h3 {
        color: #4CAF50;
        margin-bottom: 15px;
    }

    .module p {
        color: #FFFFFF;
    }

    /* 示例文章 */
    .article {
        background: rgba(11, 19, 43, 0.8);
        padding: 30px;
        border-radius: 10px;
        margin-top: 60px;
    }

    .article pre {
        background: #1E2A38;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 20px;
    }

    .article code {
        color: #4CAF50;
        font-family: 'Courier New', Courier, monospace;
    }

    /* 按钮样式 */
    .btn {
        display: inline-block;
        padding: 12px 25px;
        background: #4CAF50;
        color: #FFFFFF;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: background 0.3s ease, transform 0.3s ease;
        text-decoration: none;
        font-size: 1em;
    }

    .btn:hover {
        background: #A6ACAF;
        transform: scale(1.05);
    }

    /* 用户评价 */
    .testimonial {
        background: rgba(166, 172, 175, 0.2);
        padding: 20px;
        border-radius: 10px;
        margin-top: 40px;
        position: relative;
    }

    .testimonial::before {
        content: "“";
        font-size: 3em;
        color: #4CAF50;
        position: absolute;
        top: -20px;
        left: -10px;
    }

    .testimonial::after {
        content: "”";
        font-size: 3em;
        color: #4CAF50;
        position: absolute;
        bottom: -20px;
        right: -10px;
    }

    .testimonial p {
        font-style: italic;
        color: #FFFFFF;
    }

    .testimonial .author {
        text-align: right;
        margin-top: 10px;
        color: #A6ACAF;
        font-weight: bold;
    }

    /* 统计信息 */
    .statistics {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        margin-top: 40px;
    }

    .stat {
        flex: 1 1 200px;
        background: rgba(11, 19, 43, 0.6);
        padding: 20px;
        margin: 10px;
        border-radius: 10px;
        text-align: center;
    }

    .stat h4 {
        font-size: 2em;
        color: #4CAF50;
        margin-bottom: 10px;
    }

    .stat p {
        color: #FFFFFF;
    }

    /* 3D效果展示 */
    .three-d {
        position: relative;
        width: 100%;
        height: 400px;
        background: url('https://images.gptkong.com/demo/sample2.png') center center/cover no-repeat;
        margin-top: 60px;
        border-radius: 10px;
        overflow: hidden;
    }

    /* 粒子动画 */
    .particles {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        pointer-events: none;
    }

    /* 交互提示 */
    .interactive {
        margin-top: 40px;
        padding: 20px;
        background: rgba(166, 172, 175, 0.2);
        border-radius: 10px;
    }

    .interactive .progress-bar {
        width: 100%;
        background: #1E2A38;
        border-radius: 5px;
        overflow: hidden;
        margin-top: 10px;
    }

    .interactive .progress {
        height: 20px;
        width: 50%;
        background: linear-gradient(90deg, #FF0000, #FFA500);
        transition: width 0.3s ease, background 0.3s ease;
    }

    .interactive .warning {
        color: #FF0000;
        margin-top: 10px;
        display: none;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .navbar {
            padding: 15px 30px;
        }

        .banner h1 {
            font-size: 2.5em;
        }

        .banner .enter-button {
            font-size: 1em;
            padding: 10px 20px;
        }
    }

    @media (max-width: 1200px) {
        .container {
            padding: 60px 20px 30px 20px;
        }

        .modules {
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }
    }

    @media (max-width: 1024px) {
        .navbar ul {
            display: none;
        }

        .navbar .menu-icon {
            display: block;
            cursor: pointer;
            font-size: 1.5em;
        }

        .navbar.active ul {
            display: flex;
            flex-direction: column;
            position: absolute;
            top: 60px;
            right: 20px;
            background: rgba(11, 19, 43, 0.9);
            padding: 20px;
            border-radius: 10px;
        }

        .navbar.active ul li {
            margin: 15px 0;
        }
    }

    @media (max-width: 768px) {
        .container {
            padding: 40px 10px 20px 10px;
        }

        .banner h1 {
            font-size: 2em;
        }

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

        .three-d {
            height: 300px;
        }
    }

    @media (max-width: 480px) {
        .navbar {
            padding: 10px 20px;
        }

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

        .banner .enter-button {
            font-size: 0.8em;
            padding: 6px 12px;
        }

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

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

        .stat {
            margin: 10px 0;
        }
    }

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

        .banner .enter-button {
            font-size: 0.7em;
            padding: 5px 10px;
        }

        .article, .testimonial, .interactive {
            padding: 15px;
        }

        .stat h4 {
            font-size: 1.5em;
        }
    }