/* 全局背景图样式 */
body {
    background: url('sty.jpg') no-repeat center center fixed;
    background-size: cover;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

/* 半透明遮罩 */
.overlay {
    background-color: rgba(255, 255, 255, 0.85);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}

/* 居中容器 */
.container {
    width: 100%;
    max-width: 400px;
    margin: 100px auto;
    text-align: center;
}

/* 表单输入框样式 */
input[type="text"],
input[type="password"],
input[type="email"],
input[type="tel"] {
    width: 90%;
    padding: 12px;
    margin: 12px 0;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
}

/* 登录/注册按钮样式 */
button {
    width: 95%;
    padding: 12px;
    background-color: #007BFF;
    color: white;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s;
}

button:disabled {
    background-color: #aaa;
    cursor: not-allowed;
}

button:hover:not(:disabled) {
    background-color: #0056b3;
}

/* 错误消息样式 */
.error {
    color: red;
    font-size: 14px;
    margin-top: 10px;
}

/* 链接样式 */
a {
    display: block;
    margin-top: 20px;
    color: #007BFF;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}