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

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f0f2f5;
    font-family: Arial, sans-serif;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    text-align: center;
}

.form h2 {
    margin-bottom: 20px;
    color: #333;
}

.form input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.form button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.form button:hover {
    background-color: #0056b3;
}

.switch {
    margin-top: 10px;
}

.switch a {
    color: #007bff;
    text-decoration: none;
}

.switch a:hover {
    text-decoration: underline;
}

/* 模态弹窗样式 */
.modal {
    display: none;  /* 初始隐藏 */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4); /* 背景半透明 */
    z-index: 1000; /* 确保弹窗在最上层 */
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    text-align: center;
    min-width: 300px;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 24px;
    cursor: pointer;
}

button {
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}