.upload-container {
    border: 2px dashed #ccc;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    background-color: #f8f9fa;
    cursor: pointer;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.upload-container:hover {
    border-color: #0d6efd;
    background-color: #f1f8ff;
}

.upload-icon {
    font-size: 48px;
    color: #6c757d;
    margin-bottom: 15px;
}

.file-selected {
    border-color: #28a745;
    background-color: #f0fff4;
}

.file-selected .upload-icon {
    color: #28a745;
}

#file-name {
    font-weight: 500;
    margin-top: 10px;
    color: #495057;
}

.progress-container {
    display: none;
    margin: 20px 0;
}

.instructions {
    border-left: 4px solid #0d6efd;
    padding: 10px 15px;
    background-color: #f8f9fa;
    margin-bottom: 20px;
}

.instructions h4 {
    color: #0d6efd;
    margin-top: 0;
}

.instructions ul {
    padding-left: 20px;
    margin-bottom: 0;
}

.sample-download {
    margin-bottom: 20px;
}

.alert {
    position: relative;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}

.alert-info {
    color: #055160;
    background-color: #cff4fc;
    border-color: #b6effb;
}

.alert-success {
    color: #0f5132;
    background-color: #d1e7dd;
    border-color: #badbcc;
}

.alert-danger {
    color: #842029;
    background-color: #f8d7da;
    border-color: #f5c2c7;
}