/* 全局样式 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 登录页面样式 */
.login-container {
    max-width: 500px;
    margin: 100px auto;
    padding: 30px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 24px;
    color: #333;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

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

.login-form button {
    width: 100%;
    padding: 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.login-form button:hover {
    background-color: #45a049;
}

.alert {
    padding: 10px;
    background-color: #f44336;
    color: white;
    margin-top: 15px;
    border-radius: 4px;
}

/* 主布局样式 */
.container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #333;
    color: #fff;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
}

.logo {
    padding: 0 20px 20px;
    border-bottom: 1px solid #444;
}

.logo h2 {
    font-size: 20px;
}

.nav {
    flex-grow: 1;
}

.nav ul {
    list-style: none;
}

.nav li {
    margin-bottom: 5px;
}

.nav a {
    display: block;
    padding: 10px 20px;
    color: #fff;
    text-decoration: none;
    transition: background-color 0.3s;
}

.nav a:hover {
    background-color: #444;
}

.user-info {
    padding: 20px;
    border-top: 1px solid #444;
}

.user-info a {
    color: #4CAF50;
    text-decoration: none;
}

.user-info a:hover {
    text-decoration: underline;
}

.content {
    flex-grow: 1;
    padding: 20px;
    background-color: #f5f5f5;
}

header {
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #ddd;
}

header h1 {
    font-size: 24px;
    color: #333;
}

main {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* 欢迎页面样式 */
.welcome-container {
    padding: 20px 0;
}

.welcome-container h2 {
    margin-bottom: 15px;
    color: #333;
}

.welcome-container ul {
    margin-left: 20px;
}

.welcome-container li {
    margin-bottom: 10px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .content {
        padding: 10px;
    }
}