body {
    font-family: Arial, sans-serif;
    background: #f7f9fc;
    margin: 0;
    padding: 0;
}

.container {
    width: 90%;
    max-width: 800px;
    margin: 40px auto;
    background: #fff;
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

h2, h3 {
    margin-top: 0;
    color: #333;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    text-decoration: none;
}

.file-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.file-table th, .file-table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

.file-table th {
    background: #f1f1f1;
}

.btn, button {
    display: inline-block;
    padding: 6px 12px;
    background: #007BFF;
    color: #fff;
    border-radius: 5px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.btn:hover, button:hover {
    background: #0056b3;
}

.btn-danger {
    background: #dc3545;
}

.btn-danger:hover {
    background: #a71d2a;
}

.btn-logout {
    background: #6c757d;
    padding: 6px 12px;
    border-radius: 5px;
    color: #fff;
    text-decoration: none;
}

.btn-logout:hover {
    background: #5a6268;
}

.login-form, .upload-form {
    margin-top: 20px;
}

input[type="text"], input[type="password"], input[type="file"] {
    padding: 8px;
    width: 100%;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.success {
    color: green;
    font-weight: bold;
}

.error {
    color: red;
    font-weight: bold;
}