/* 全局样式 */
    @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&family=Roboto:wght@400;500&display=swap');

    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #8e44ad, #3498db, #ff7e5f, #feb47b);
        background-size: 400% 400%;
        animation: gradientAnimation 15s ease infinite;
        color: #ffffff;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
    }

    @keyframes gradientAnimation {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    /* 导航栏样式 */
    nav {
        width: 100%;
        padding: 20px 40px;
        background: rgba(255, 255, 255, 0.1);
        backdrop-filter: blur(10px);
        display: flex;
        justify-content: space-between;
        align-items: center;
        position: fixed;
        top: 0;
        z-index: 1000;
    }

    nav .logo {
        font-family: 'Poppins', sans-serif;
        font-size: 24px;
        font-weight: 600;
        color: #ffffff;
        text-decoration: none;
    }

    nav ul {
        list-style: none;
        display: flex;
        gap: 20px;
    }

    nav ul li a {
        color: #ffffff;
        text-decoration: none;
        font-size: 16px;
        transition: color 0.3s ease;
    }

    nav ul li a:hover {
        color: #ff5722;
    }

    /* 主内容样式 */
    main {
        flex: 1;
        padding: 100px 40px 40px 40px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .announcement {
        background: rgba(255, 255, 255, 0.2);
        backdrop-filter: blur(10px);
        padding: 20px;
        border-radius: 15px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        max-width: 800px;
        width: 100%;
        margin-bottom: 40px;
        text-align: center;
    }

    .announcement h1 {
        font-family: 'Poppins', sans-serif;
        font-size: 32px;
        margin-bottom: 10px;
    }

    .announcement p {
        font-size: 18px;
        line-height: 1.6;
    }

    /* 示例展示样式 */
    .sample-display {
        background: rgba(255, 255, 255, 0.15);
        backdrop-filter: blur(10px);
        padding: 30px;
        border-radius: 20px;
        box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
        max-width: 1000px;
        width: 100%;
    }

    .sample-display h2 {
        font-family: 'Poppins', sans-serif;
        font-size: 28px;
        margin-bottom: 20px;
        text-align: center;
    }

    .sample-display article {
        font-size: 16px;
        line-height: 1.8;
        color: #f0f0f0;
    }

    .sample-display pre {
        background: rgba(0, 0, 0, 0.6);
        padding: 15px;
        border-radius: 10px;
        overflow-x: auto;
        margin: 20px 0;
    }

    .sample-display code {
        font-family: 'Roboto', monospace;
        color: #ffeb3b;
    }

    /* 图片展示样式 */
    .image-gallery {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 20px;
        width: 100%;
        max-width: 1000px;
        margin: 40px 0;
    }

    .image-gallery img {
        width: 100%;
        height: auto;
        border-radius: 10px;
        object-fit: cover;
    }

    /* 提示信息样式 */
    .reference-note {
        font-size: 14px;
        color: #dddddd;
        margin-top: 20px;
        text-align: center;
    }

    /* 底部悬浮按钮样式 */
    .floating-button {
        position: fixed;
        bottom: 30px;
        right: 30px;
        background: rgba(255, 87, 34, 0.8);
        color: #ffffff;
        border: none;
        padding: 15px 25px;
        border-radius: 50px;
        font-size: 16px;
        cursor: pointer;
        transition: transform 0.3s ease, background 0.3s ease;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    }

    .floating-button:hover {
        transform: scale(1.1);
        background: #ff5722;
    }

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

        .announcement h1 {
            font-size: 28px;
        }

        .announcement p {
            font-size: 16px;
        }

        .sample-display h2 {
            font-size: 24px;
        }

        .sample-display article {
            font-size: 15px;
        }
    }

    @media (max-width: 1200px) {
        main {
            padding: 80px 30px 30px 30px;
        }

        .announcement {
            padding: 15px;
        }

        .sample-display {
            padding: 25px;
        }

        .floating-button {
            padding: 12px 20px;
            font-size: 14px;
        }
    }

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

        .hamburger {
            display: block;
            cursor: pointer;
        }

        .image-gallery {
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        }
    }

    @media (max-width: 768px) {
        .announcement h1 {
            font-size: 24px;
        }

        .sample-display h2 {
            font-size: 20px;
        }

        .image-gallery {
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        }

        nav {
            padding: 10px 20px;
        }
    }

    @media (max-width: 480px) {
        .announcement h1 {
            font-size: 20px;
        }

        .announcement p, .sample-display article {
            font-size: 14px;
        }

        .sample-display h2 {
            font-size: 18px;
        }

        .floating-button {
            padding: 10px 18px;
            font-size: 12px;
        }

        .image-gallery {
            grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
            gap: 10px;
        }
    }

    @media (max-width: 320px) {
        .announcement h1 {
            font-size: 18px;
        }

        .sample-display h2 {
            font-size: 16px;
        }

        .sample-display article {
            font-size: 12px;
        }

        .floating-button {
            padding: 8px 15px;
            font-size: 10px;
        }
    }