/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 顶部导航栏 */
header {
    background-color: #2c3e50;
    color: white;
    padding: 10px 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header a {
    color: white;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
}

/* 登录容器 */
.login-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    max-width: 400px;
    width: 100%;
    margin: 0 auto;
    padding: 20px;
}

/* 登录表单 */
.login-form {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 30px;
    width: 100%;
    max-width: 400px;
}

/* 表单标题 */
.login-title {
    text-align: center;
    margin-bottom: 25px;
    color: #2c3e50;
    font-size: 24px;
    font-weight: bold;
}

/* 表单组 */
.form-group {
    margin-bottom: 20px;
}

/* 标签 */
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

/* 输入框 */
.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    border-color: #3498db;
    outline: none;
}

/* 按钮 */
.login-btn {
    width: 100%;
    padding: 12px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

.login-btn:hover {
    background-color: #2980b9;
}

.login-btn:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

/* 错误信息 */
.error-message {
    color: #e74c3c;
    text-align: center;
    margin-top: 15px;
    font-size: 14px;
    display: none;
}

/* 链接 */
.form-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 14px;
    color: #7f8c8d;
}

.form-footer a {
    color: #3498db;
    text-decoration: none;
}

.form-footer a:hover {
    text-decoration: underline;
}