/* 导航栏 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: #333;
            text-decoration: none;
            display: flex;
            align-items: center;
        }

        .logo img {
            height: 40px;
            margin-right: 10px;
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 30px;
        }

        .nav-links a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            transition: color 0.3s;
            font-size: 16px;
        }

        .nav-links a:hover {
            color: #3498db;
        }