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

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #0074D9, #FFFFFF);
        color: #333333;
        line-height: 1.6;
        padding: 20px;
    }

    header {
        background: linear-gradient(135deg, #0074D9, #696969);
        padding: 20px;
        color: #FFFFFF;
        text-align: center;
        position: fixed;
        width: 100%;
        top: 0;
        left: 0;
        z-index: 1000;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    header h1 {
        font-size: 2em;
        font-weight: bold;
    }

    nav {
        margin-top: 10px;
    }

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

    nav ul li {
        margin: 0 15px;
    }

    nav ul li a {
        color: #FFA500;
        text-decoration: none;
        font-weight: bold;
        transition: color 0.3s ease;
    }

    nav ul li a:hover {
        color: #32CD32;
        transform: scale(1.1);
        transition: transform 0.3s ease, color 0.3s ease;
    }

    main {
        margin-top: 100px;
        display: grid;
        grid-template-columns: 1fr;
        gap: 20px;
    }

    @media(min-width: 768px) {
        main {
            grid-template-columns: 3fr 1fr;
        }
    }

    .content {
        background: #FFFFFF;
        padding: 20px;
        border-radius: 8px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        animation: fadeIn 1s ease-in-out;
    }

    .content h2 {
        color: #0074D9;
        margin-bottom: 10px;
    }

    .content h3 {
        color: #FFA500;
        margin-top: 20px;
        margin-bottom: 10px;
    }

    .content p {
        margin-bottom: 15px;
    }

    .content pre {
        background: #f4f4f4;
        padding: 10px;
        border-radius: 5px;
        overflow-x: auto;
    }

    .content code {
        font-family: 'Courier New', Courier, monospace;
        color: #D14;
    }

    .sidebar {
        background: #696969;
        padding: 20px;
        border-radius: 8px;
        color: #FFFFFF;
        position: sticky;
        top: 120px;
        height: fit-content;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }

    .sidebar h3 {
        margin-bottom: 15px;
        color: #FFA500;
    }

    .sidebar ul {
        list-style: none;
    }

    .sidebar ul li {
        margin-bottom: 10px;
    }

    .sidebar ul li a {
        color: #FFFFFF;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    .sidebar ul li a:hover {
        color: #32CD32;
        transition: color 0.3s ease;
    }

    footer {
        background: linear-gradient(135deg, #0074D9, #696969);
        color: #FFFFFF;
        text-align: center;
        padding: 20px;
        margin-top: 40px;
        border-radius: 8px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }

    footer p {
        margin: 5px 0;
    }

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

    .button {
        background: #FFA500;
        color: #FFFFFF;
        padding: 10px 20px;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: transform 0.3s ease, background 0.3s ease;
    }

    .button:hover {
        background: #32CD32;
        transform: scale(1.05);
    }

    .card {
        background: #f9f9f9;
        padding: 15px;
        border-radius: 8px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        transition: transform 0.3s ease;
    }

    .card:hover {
        transform: scale(1.02);
        box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    }

    .image-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 10px;
        margin-top: 20px;
    }

    .image-grid img {
        width: 100%;
        border-radius: 5px;
        object-fit: cover;
    }

    /* 智慧网络元素 */
    .network-background {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: url('https://images.gptkong.com/demo/sample12.png');
        background-size: cover;
        opacity: 0.1;
        z-index: -1;
    }

    /* 代码块样式 */
    .code-preview {
        background: #2d2d2d;
        color: #f8f8f2;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        font-family: 'Courier New', Courier, monospace;
    }

    .code-preview .keyword {
        color: #66d9ef;
    }

    .code-preview .string {
        color: #e6db74;
    }

    .code-preview .comment {
        color: #75715e;
        font-style: italic;
    }

    /* 响应式设计 */
    @media(max-width: 320px) {
        header h1 {
            font-size: 1.5em;
        }

        nav ul {
            flex-direction: column;
        }

        nav ul li {
            margin: 10px 0;
        }

        .sidebar {
            display: none;
        }
    }

    @media(min-width: 480px) {
        main {
            grid-template-columns: 4fr 1fr;
        }
    }

    @media(min-width: 768px) {
        .image-grid {
            grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        }
    }

    @media(min-width: 1024px) {
        body {
            padding: 40px;
        }

        header h1 {
            font-size: 2.5em;
        }

        nav ul li a {
            font-size: 1.1em;
        }
    }

    @media(min-width: 1200px) {
        main {
            grid-template-columns: 3fr 1fr;
        }
    }

    @media(min-width: 1440px) {
        body {
            padding: 60px;
        }

        header h1 {
            font-size: 3em;
        }

        nav ul li a {
            font-size: 1.2em;
        }

        .content {
            padding: 30px;
        }
    }