/* 基本样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background-color: #3498db;
    color: #fff;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

nav {
    margin-top: 1rem;
}

nav ul {
    list-style: none;
    display: flex;
}

nav ul li {
    margin-right: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 3px;
    transition: background-color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    background-color: rgba(255,255,255,0.2);
}

/* 页脚样式 */
footer {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    margin-top: 2rem;
    text-align: center;
}

/* 主内容区域 */
main {
    padding: 2rem 0;
}

.welcome-section {
    background-color: #fff;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-top: 2rem;
}

/* 登录页面样式 */
.login-page {
    background-color: #f9f9f9;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 1rem;
}

.login-box {
    background-color: #fff;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

.login-box h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #3498db;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="text"]:focus,
input[type="password"]:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.btn-login {
    background-color: #3498db;
    color: #fff;
    border: none;
    padding: 0.8rem;
    width: 100%;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

.error-message {
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 5px;
    display: block;
}

.form-message {
    text-align: center;
    margin-top: 1rem;
    font-weight: bold;
}

.form-message.error {
    color: #e74c3c;
}

.form-message.success {
    color: #2ecc71;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    nav ul {
        flex-direction: column;
    }
    
    nav ul li {
        margin-right: 0;
        margin-bottom: 0.5rem;
    }
}

@media screen and (max-width: 480px) {
    .login-container {
        padding: 0.5rem;
    }
    
    .login-box {
        padding: 1.5rem;
    }
    
    .login-box h1 {
        font-size: 1.5rem;
    }
}