body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f4f4f4;
            color: #333;
            line-height: 1.6;
        }

        .top-bar {
            background-color: white;
            color: black;
            padding: 10px 0;
            text-align: left;
            position: relative;
        }

        .top-bar-content {
            width: 80%;
            margin: 0 auto;
        }

        .top-bar h2 {
            margin: 0;
            font-size: 20px;
        }

        .blue-bar {
            height: 5px;
            background-color: #007bff;
            width: 100%;
            position: absolute;
            bottom: 0;
        }

        .auth-container {
            background-color: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            margin: 20px auto;
            width: 80%;
            max-width: 400px;
        }

        .auth-header {
            text-align: center;
            margin-bottom: 20px;
        }

        .auth-header h1 {
            margin: 0;
            font-size: 24px;
        }

        .switch-buttons {
            display: flex;
            justify-content: space-between;
            margin-top: 10px;
        }

        .switch-button {
            flex: 1;
            padding: 10px;
            font-size: 14px;
            cursor: pointer;
            transition: border-color 0.3s, color 0.3s;
            background-color: transparent;
            border: 1px solid #ccc;
            border-radius: 5px;
            margin: 0 5px;
            text-decoration: none;
            color: #333;
        }

        .switch-button:hover {
            border-color: #007bff;
            color: #007bff;
        }

        .form-container {
            display: none;
        }

        .form-container form {
            display: flex;
            flex-direction: column;
        }

        .form-container label {
            margin-bottom: 5px;
            font-size: 14px;
        }

        .form-container input {
            padding: 10px;
            margin-bottom: 15px;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 14px;
        }

        .form-container button {
            padding: 10px;
            font-size: 14px;
            cursor: pointer;
            transition: border-color 0.3s, color 0.3s;
            background-color: transparent;
            border: 1px solid #ccc;
            border-radius: 5px;
            color: #333;
        }

        .form-container button:hover {
            border-color: #007bff;
            color: #007bff;
        }

        .terms-container {
            margin-top: 10px;
        }

        .terms-link {
            color: #007bff;
            text-decoration: none;
        }

        .terms-link:hover {
            text-decoration: underline;
        }

        /* 模态框样式 */
        .modal {
            display: none; /* 默认隐藏 */
            position: fixed;
            z-index: 1000; /* 确保模态框在最上层 */
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0, 0, 0, 0.4); /* 半透明背景 */
        }

        .modal-content {
            background-color: #fefefe;
            margin: 15% auto; /* 垂直居中 */
            padding: 20px;
            border: 1px solid #888;
            width: 80%;
            max-width: 500px; /* 最大宽度 */
            border-radius: 8px;
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
            position: relative;
        }

        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
        }

        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
            cursor: pointer;
        }