/* 基础重置 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(to bottom, #000033, #000000);
        color: #ffffff;
        line-height: 1.6;
        padding: 20px;
    }

    header {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
        text-align: center;
        margin-bottom: 30px;
    }

    header h1 {
        font-family: 'Montserrat', sans-serif;
        font-size: 2.5rem;
        color: #ffcc00;
        text-transform: uppercase;
        letter-spacing: 3px;
    }

    nav {
        display: flex;
        justify-content: center;
        gap: 20px;
        margin-top: 15px;
    }

    nav a {
        color: #ffffff;
        text-decoration: none;
        font-size: 1.1rem;
        position: relative;
        padding: 5px 10px;
        transition: color 0.3s;
    }

    nav a::after {
        content: '';
        display: block;
        width: 0;
        height: 2px;
        background: #ffcc00;
        transition: width 0.3s;
        position: absolute;
        left: 0;
        bottom: 0;
    }

    nav a:hover::after {
        width: 100%;
    }

    .hero {
        background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
        height: 400px;
        border-radius: 15px;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 40px;
    }

    .hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 51, 0.6);
        border-radius: 15px;
    }

    .hero-content {
        position: relative;
        z-index: 1;
        text-align: center;
    }

    .hero-content h2 {
        font-size: 2rem;
        color: #ffffff;
        margin-bottom: 10px;
    }

    .hero-content p {
        font-size: 1.2rem;
        color: #cccccc;
    }

    section {
        margin-bottom: 40px;
    }

    .section-title {
        font-size: 1.8rem;
        color: #ffcc00;
        margin-bottom: 20px;
        border-bottom: 2px solid #ffcc00;
        display: inline-block;
    }

    .cards {
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
    }

    .card {
        background: rgba(255, 255, 255, 0.1);
        border: 1px solid #ffcc00;
        border-radius: 10px;
        padding: 20px;
        flex: 1 1 calc(33.333% - 40px);
        min-width: 250px;
        transition: transform 0.3s, box-shadow 0.3s;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 0 20px #ffcc00;
    }

    .card img {
        width: 100%;
        border-radius: 5px;
        margin-bottom: 15px;
    }

    .card h3 {
        font-size: 1.5rem;
        color: #ffcc00;
        margin-bottom: 10px;
    }

    .card p {
        color: #cccccc;
        font-size: 1rem;
    }

    .example-article {
        background: rgba(255, 255, 255, 0.1);
        border: 2px solid #ffcc00;
        border-radius: 10px;
        padding: 20px;
        margin-bottom: 40px;
    }

    .example-article h2 {
        color: #ffcc00;
        margin-bottom: 15px;
        font-size: 2rem;
        border-bottom: 1px solid #ffcc00;
        padding-bottom: 10px;
    }

    .example-article h3 {
        color: #ffffff;
        margin-top: 20px;
        font-size: 1.5rem;
    }

    .example-article p {
        margin-top: 10px;
        color: #cccccc;
    }

    .example-article pre {
        background: #1e1e1e;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-top: 10px;
    }

    .example-article code {
        color: #00ff00;
        font-family: 'Courier New', Courier, monospace;
    }

    footer {
        text-align: center;
        padding: 20px;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 10px;
    }

    footer p {
        color: #ffffff;
        font-size: 1rem;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .card {
            flex: 1 1 calc(33.333% - 40px);
        }
    }

    @media (max-width: 1200px) {
        .card {
            flex: 1 1 calc(50% - 40px);
        }
    }

    @media (max-width: 1024px) {
        .cards {
            flex-direction: column;
            align-items: center;
        }
        .card {
            flex: 1 1 100%;
        }
    }

    @media (max-width: 768px) {
        header h1 {
            font-size: 2rem;
        }
        nav {
            flex-direction: column;
            gap: 10px;
        }
        .hero {
            height: 250px;
        }
        .hero-content h2 {
            font-size: 1.5rem;
        }
        .cards {
            flex-direction: column;
            align-items: center;
        }
        .card {
            flex: 1 1 100%;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.5rem;
        }
        nav a {
            font-size: 1rem;
        }
        .hero {
            height: 200px;
        }
        .hero-content h2 {
            font-size: 1.2rem;
        }
        .section-title {
            font-size: 1.5rem;
        }
        .card h3 {
            font-size: 1.2rem;
        }
    }

    @media (max-width: 320px) {
        body {
            padding: 10px;
        }
        header h1 {
            font-size: 1.2rem;
        }
        nav a {
            font-size: 0.9rem;
        }
        .hero {
            height: 150px;
        }
        .hero-content h2 {
            font-size: 1rem;
        }
        .section-title {
            font-size: 1.2rem;
        }
        .card {
            padding: 15px;
        }
        .card h3 {
            font-size: 1rem;
        }
    }