/* 全局样式 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #6a11cb, #2575fc);
        color: #ffffff;
        line-height: 1.6;
        overflow-x: hidden;
    }

    /* 导航栏 */
    .navbar {
        position: fixed;
        top: 0;
        width: 100%;
        background: rgba(0, 0, 0, 0.6);
        padding: 20px 50px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        z-index: 1000;
    }

    .navbar a {
        color: #ffffff;
        text-decoration: none;
        margin-left: 20px;
        font-size: 1em;
        transition: color 0.3s ease;
    }

    .navbar a:hover {
        color: #ffdd57;
    }

    /* 主页 */
    .hero {
        height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
        text-align: center;
        background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
        position: relative;
    }

    .hero::after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(135deg, rgba(106,17,203,0.7), rgba(37,117,252,0.7));
        z-index: 1;
    }

    .hero-content {
        position: relative;
        z-index: 2;
        max-width: 800px;
        padding: 20px;
    }

    .hero h1 {
        font-size: 3em;
        margin-bottom: 20px;
        animation: fadeInDown 1s ease forwards;
    }

    .hero p {
        font-size: 1.2em;
        margin-bottom: 30px;
        animation: fadeInUp 1s ease forwards;
        animation-delay: 0.5s;
        opacity: 0;
    }

    .hero button {
        padding: 10px 20px;
        font-size: 1em;
        border: none;
        border-radius: 5px;
        background: #ffdd57;
        color: #000000;
        cursor: pointer;
        transition: background 0.3s ease;
    }

    .hero button:hover {
        background: #ffd700;
    }

    /* 动画关键帧 */
    @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 */
    .content {
        padding: 100px 50px;
        background: linear-gradient(135deg, #2575fc, #6a11cb);
    }

    .content h2 {
        text-align: center;
        margin-bottom: 50px;
        font-size: 2.5em;
    }

    .cards {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
    }

    .card {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 10px;
        width: 30%;
        margin-bottom: 30px;
        padding: 20px;
        box-shadow: 0 4px 15px rgba(0,0,0,0.3);
        transition: transform 0.3s ease, background 0.3s ease;
    }

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

    .card img {
        width: 100%;
        border-radius: 10px;
        margin-bottom: 15px;
    }

    .card h3 {
        margin-bottom: 10px;
        font-size: 1.5em;
    }

    .card p {
        font-size: 1em;
    }

    /* 示例数据展示 */
    .sample-data {
        padding: 50px;
        background: rgba(0, 0, 0, 0.8);
        border-radius: 10px;
        margin-top: 50px;
    }

    .sample-data h2 {
        text-align: center;
        margin-bottom: 20px;
        font-size: 2em;
        color: #ffdd57;
    }

    .sample-data article {
        max-height: 600px;
        overflow-y: auto;
    }

    .sample-data pre {
        background: #2e2e2e;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 20px;
    }

    .sample-data code {
        color: #ffdd57;
        font-family: 'Courier New', Courier, monospace;
    }

    /* 底部 */
    .footer {
        padding: 20px 50px;
        background: rgba(0, 0, 0, 0.6);
        text-align: center;
        position: relative;
        color: #ffffff;
    }

    .footer p {
        font-size: 1em;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .card {
            width: 31%;
        }
    }

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

    @media (max-width: 1024px) {
        .card {
            width: 48%;
        }
    }

    @media (max-width: 768px) {
        .cards {
            flex-direction: column;
            align-items: center;
        }

        .card {
            width: 80%;
        }

        .navbar {
            padding: 15px 20px;
        }

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

        .hero p {
            font-size: 1em;
        }
    }

    @media (max-width: 480px) {
        .card {
            width: 100%;
        }

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

        .hero p {
            font-size: 0.9em;
        }

        .navbar a {
            margin-left: 10px;
            font-size: 0.9em;
        }
    }

    @media (max-width: 320px) {
        .hero h1 {
            font-size: 1.5em;
        }

        .hero p {
            font-size: 0.8em;
        }

        .card {
            padding: 15px;
        }
    }