/* 全局样式 */
    @import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@700&family=Roboto&display=swap');

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

    body {
        font-family: 'Roboto', sans-serif;
        color: #ffffff;
        background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
        overflow-x: hidden;
        line-height: 1.6;
    }

    h1, h2, h3, h4 {
        font-family: 'Orbitron', sans-serif;
        color: #00e6e6;
        margin-bottom: 20px;
    }

    h1 {
        font-size: 3em;
        text-align: center;
        margin-top: 20px;
    }

    h2 {
        font-size: 2.5em;
        margin-top: 40px;
    }

    h3 {
        font-size: 2em;
        margin-top: 30px;
    }

    h4 {
        font-size: 1.5em;
        margin-top: 25px;
    }

    p {
        font-size: 1em;
        margin-bottom: 15px;
        padding: 0 20px;
    }

    pre {
        background: rgba(255, 255, 255, 0.1);
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin: 20px;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        color: #ffcc00;
    }

    table {
        width: 90%;
        margin: 20px auto;
        border-collapse: collapse;
    }

    th, td {
        border: 1px solid #555;
        padding: 10px;
        text-align: left;
    }

    th {
        background: #333;
    }

    /* 导航栏 */
    .navbar {
        position: fixed;
        top: 0;
        width: 100%;
        background: rgba(0, 0, 0, 0.7);
        padding: 15px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        z-index: 1000;
    }

    .navbar a {
        color: #00e6e6;
        text-decoration: none;
        margin: 0 10px;
        font-size: 1em;
    }

    .navbar a:hover {
        color: #ffcc00;
    }

    /* 背景动画 */
    .background-stars {
        position: fixed;
        width: 100%;
        height: 100%;
        background-image: url('https://images.gptkong.com/demo/sample1.png');
        background-size: cover;
        animation: starFlow 60s linear infinite;
        z-index: -1;
    }

    @keyframes starFlow {
        0% { transform: translateY(0); }
        100% { transform: translateY(-100px); }
    }

    /* 内容区 */
    .content {
        padding: 100px 20px 50px 20px;
        max-width: 1200px;
        margin: 0 auto;
    }

    .content-box {
        background: rgba(255, 255, 255, 0.05);
        padding: 20px;
        border-radius: 10px;
        margin-bottom: 30px;
        transition: all 0.6s ease-in-out;
    }

    .content-box.active {
        opacity: 1;
        transform: translateY(0);
    }

    /* 悬浮卡片 */
    .card {
        background: rgba(255, 255, 255, 0.1);
        padding: 15px;
        border-radius: 8px;
        margin: 20px 0;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        h1 {
            font-size: 2.8em;
        }
        h2 {
            font-size: 2.3em;
        }
    }

    @media (max-width: 1200px) {
        .content {
            padding: 90px 15px 40px 15px;
        }
        table {
            width: 100%;
        }
    }

    @media (max-width: 1024px) {
        h1 {
            font-size: 2.5em;
        }
        h2 {
            font-size: 2em;
        }
    }

    @media (max-width: 768px) {
        .navbar {
            flex-direction: column;
        }
        .navbar a {
            margin: 5px 0;
        }
        h1 {
            font-size: 2.2em;
        }
        h2 {
            font-size: 1.8em;
        }
    }

    @media (max-width: 480px) {
        h1 {
            font-size: 1.8em;
        }
        h2 {
            font-size: 1.5em;
        }
        p {
            padding: 0 10px;
            font-size: 0.9em;
        }
    }

    @media (max-width: 320px) {
        h1 {
            font-size: 1.5em;
        }
        h2 {
            font-size: 1.2em;
        }
        p {
            font-size: 0.8em;
        }
    }

    /* 按钮样式 */
    .btn {
        display: inline-block;
        padding: 10px 20px;
        background: #00e6e6;
        color: #000;
        border-radius: 5px;
        text-decoration: none;
        transition: background 0.3s;
    }

    .btn:hover {
        background: #ffcc00;
    }

    /* 图像样式 */
    .image-gallery {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
        margin: 20px 0;
    }

    .image-gallery img {
        width: 100%;
        max-width: 320px;
        border-radius: 5px;
    }

    /* 底部悬浮菜单 */
    .floating-menu {
        position: fixed;
        bottom: 20px;
        right: 20px;
        background: rgba(0, 0, 0, 0.7);
        padding: 10px;
        border-radius: 50%;
        z-index: 1000;
    }

    .floating-menu a {
        color: #00e6e6;
        text-decoration: none;
        font-size: 1.2em;
        margin: 0 5px;
    }

    .floating-menu a:hover {
        color: #ffcc00;
    }

    /* 过渡动画 */
    .fade-in {
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.6s ease-in-out;
    }

    .fade-in.show {
        opacity: 1;
        transform: translateY(0);
    }

    /* 提示样式 */
    .reference-note {
        text-align: center;
        font-size: 1em;
        margin-top: 30px;
        color: #ffcc00;
    }