body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 20px;
    color: #333;
}

h1 {
    color: #007acc;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 15px;
}

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

input[type="text"], input[type="file"] {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.btn {
    background-color: #007acc;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.btn:hover {
    background-color: #005f9e;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

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

th {
    background-color: #f8f8f8;
}

.nav {
    margin-bottom: 20px;
}

.nav a {
    margin-right: 15px;
    text-decoration: none;
    color: #007acc;
    font-weight: bold;
}

.error-message {
    color: red;
    font-weight: bold;
    margin-top: 10px;
}

.success-message {
    color: green;
    font-weight: bold;
    margin-top: 10px;
}