body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

h1 {
    color: #333;
    text-align: center;
    margin-top: 20px;
}

header {
    background-color: #333;
    color: white;
    padding: 10px 0;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
}

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

a {
    color: white;
    text-decoration: none;
}

.login-container, .upload-container {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
    margin: 50px auto;
}

input[type="text"], input[type="password"], input[type="file"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    border: 1px solid #ddd;
}

input[type="submit"] {
    background-color: #4CAF50;
    color: white;
    padding: 10px;
    border: none;
   
}
/* 通用样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

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

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
}

.articles ul {
    list-style-type: none;
    padding: 0;
}

.articles ul li {
    background-color: white;
    margin: 10px 0;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.articles ul li a {
    text-decoration: none;
    color: #333;
    font-size: 18px;
}

.articles ul li a:hover {
    color: #007BFF;
}

h2 {
    color: #333;
}