#dropZone {
    border: 2px dashed #dee2e6;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

#dropZone.dragover {
    border-color: #0d6efd;
    background-color: rgba(13, 110, 253, 0.05);
}

#dropZone i {
    font-size: 2rem;
    color: #6c757d;
    margin-bottom: 0.5rem;
}

#fileInfo {
    padding: 0.5rem;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.message-input-container {
    margin-bottom: 1rem;
}

.numbers-list {
    max-height: 300px;
    overflow-y: auto;
}

.list-group-item {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.copy-btn {
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s;
}

.copy-btn:hover {
    opacity: 1;
}

#progressBar {
    height: 6px;
    margin-top: 0.5rem;
}