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

header {
    background-color: #f8f9fa;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

header a {
    color: #333;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

header a:hover {
    color: #007bff;
}

header a.active {
    color: #007bff;
    font-weight: 600;
    border-bottom: 2px solid #007bff;
    padding-bottom: 2px;
}

header .header-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

header .header-controls label {
    margin: 0;
    font-weight: 500;
    font-size: 14px;
}

header .header-controls select {
    width: 250px;
    padding: 6px 10px;
    font-size: 14px;
}

main {
    padding: 0 20px 20px 20px;
}

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

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

select,
input[type="text"],
input[type="file"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

main button {
    padding: 10px 20px;
}

button:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 20px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #f9f9f9;
    white-space: pre-wrap;
    display: none;
}

.loading {
    color: #666;
    font-style: italic;
}