/* 基本重置 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #87C4A5, #2F3E46);
        color: #2F3E46;
        line-height: 1.6;
        padding: 20px;
    }

    header {
        width: 100%;
        height: 100vh;
        background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
        overflow: hidden;
    }

    header::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(47, 62, 70, 0.5);
    }

    header h1 {
        position: relative;
        color: #FFFFFF;
        font-size: 3rem;
        z-index: 1;
        text-align: center;
        animation: fadeIn 2s ease-in-out;
    }

    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }

    nav {
        background: rgba(47, 62, 70, 0.9);
        padding: 10px 20px;
        position: fixed;
        top: 0;
        width: 100%;
        z-index: 1000;
    }

    nav ul {
        list-style: none;
        display: flex;
        justify-content: center;
    }

    nav ul li {
        margin: 0 15px;
    }

    nav ul li a {
        color: #FFB400;
        text-decoration: none;
        font-size: 1.1rem;
        transition: color 0.3s ease;
    }

    nav ul li a:hover {
        color: #87C4A5;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 80px 20px 20px 20px;
    }

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

    .card {
        background: rgba(255, 255, 255, 0.8);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        border-radius: 10px;
        padding: 20px;
        position: relative;
        overflow: hidden;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

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

    .card::before {
        content: '';
        position: absolute;
        top: -10px;
        left: -10px;
        width: 100%;
        height: 100%;
        background: url('https://images.gptkong.com/demo/sample2.png') no-repeat center/cover;
        opacity: 0.1;
    }

    .card h3 {
        margin-bottom: 15px;
        color: #2F3E46;
    }

    .card p {
        color: #555555;
    }

    .btn {
        display: inline-block;
        background-color: #87C4A5;
        color: white;
        padding: 10px 20px;
        border-radius: 8px;
        text-decoration: none;
        transition: background-color 0.3s ease;
        margin-top: 10px;
    }

    .btn:hover {
        background-color: #FFB400;
    }

    article {
        background: rgba(255, 255, 255, 0.9);
        padding: 30px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        margin-bottom: 40px;
    }

    article h2 {
        font-family: 'Playfair Display', serif;
        font-size: 2.5rem;
        margin-bottom: 20px;
        color: #2F3E46;
    }

    article h3 {
        font-family: 'Playfair Display', serif;
        font-size: 2rem;
        margin-top: 20px;
        margin-bottom: 10px;
        color: #87C4A5;
    }

    article h4 {
        font-family: 'Playfair Display', serif;
        font-size: 1.5rem;
        margin-top: 15px;
        margin-bottom: 10px;
        color: #2F3E46;
    }

    article p {
        margin-bottom: 15px;
    }

    article pre {
        background: #f5f5f5;
        padding: 15px;
        border-radius: 5px;
        overflow: auto;
        font-family: 'Courier New', Courier, monospace;
        margin-bottom: 15px;
    }

    article table {
        width: 100%;
        border-collapse: collapse;
        margin-bottom: 15px;
    }

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

    article th, article td {
        padding: 10px;
        text-align: left;
    }

    footer {
        background: rgba(47, 62, 70, 0.9);
        color: #FFFFFF;
        padding: 20px;
        text-align: center;
        border-radius: 10px;
    }

    footer a {
        color: #FFB400;
        text-decoration: none;
        margin: 0 10px;
        transition: color 0.3s ease;
    }

    footer a:hover {
        color: #87C4A5;
    }

    /* 动画效果 */
    @keyframes aurora-move {
        0% { background: radial-gradient(circle, rgb(255, 87, 34), transparent); }
        50% { background: radial-gradient(circle, rgb(34, 203, 255), transparent); }
        100% { background: radial-gradient(circle, rgb(255, 87, 34), transparent); }
    }

    .animated-background {
        animation: aurora-move 15s linear infinite;
    }

    /* 响应式设计 */
    @media (max-width: 1200px) {
        header h1 {
            font-size: 2.5rem;
        }
    }

    @media (max-width: 1024px) {
        .grid-container {
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        }
        
        article h2 {
            font-size: 2rem;
        }
    }

    @media (max-width: 768px) {
        nav ul {
            flex-direction: column;
        }
        
        nav ul li {
            margin: 10px 0;
        }

        header h1 {
            font-size: 2rem;
        }

        article h2 {
            font-size: 1.8rem;
        }
    }

    @media (max-width: 480px) {
        nav ul li a {
            font-size: 1rem;
        }

        .btn {
            padding: 8px 16px;
        }

        article h2 {
            font-size: 1.5rem;
        }
    }

    @media (max-width: 320px) {
        nav ul li a {
            font-size: 0.9rem;
        }

        header h1 {
            font-size: 1.5rem;
        }
    }