body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
}

.status {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 5px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #dc3545;
}

.status-indicator.active {
    background-color: #28a745;
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.file-input-container {
    position: relative;
}

input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-label {
    display: block;
    padding: 12px;
    background-color: #e9ecef;
    border: 2px dashed #ced4da;
    border-radius: 5px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-label:hover {
    background-color: #dee2e6;
    border-color: #adb5bd;
}

.upload-button {
    padding: 12px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

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

.message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
}