/* --- MODERN UPLOAD AREA --- */
.upload-area {
    border: 3px dashed #adb5bd;
    border-radius: 0.75rem;
    padding: 3rem;
    text-align: center;
    background-color: #ffffff;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.upload-area:hover, .upload-area.dragover {
    background-color: #f0f8ff; /* A light blue tint on hover */
    border-color: #0d6efd;
}

.upload-area .upload-icon {
    font-size: 3rem;
    color: #0d6efd;
    margin-bottom: 1rem;
}

.upload-area p {
    font-size: 1.1rem;
    color: #6c757d;
    margin-bottom: 0.5rem;
}

.upload-area .browse-link {
    color: #0d6efd;
    font-weight: 500;
    text-decoration: none;
}

/* --- FILE PREVIEW THUMBNAILS --- */
#file-previews {
    margin-top: 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); /* Responsive grid */
    gap: 1rem;
}

.preview-card {
    display: flex;
    align-items: center;
    background-color: #e9ecef;
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
}

.preview-card .file-icon {
    font-size: 1.75rem;
    color: #495057;
    margin-right: 1rem;
}

.preview-card .file-info {
    overflow: hidden;
}

.preview-card .file-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0;
}

.preview-card .file-size {
    font-size: 0.8rem;
    color: #6c757d;
}
@media (min-width: 576px) {
    .display-5.fw-bold {
        font-size: 1.8rem !important;
    }
    
    .lead.text-muted {
        font-size: 1rem !important;
    }
}