:root {
    --upload-border: #ced4da;
    --upload-border-hover: #0d6efd;
    --upload-bg: #ffffff;
    --upload-bg-hover: #f8f9fa;
    --upload-text: #495057;
    --upload-muted: #6c757d;
    --upload-radius: 1rem;
    --upload-transition: all .25s ease;
}

.upload-container {
    max-width: 720px;
    margin: 0 auto;
}

.upload-card {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .08);
}

.upload-dropzone {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;

    min-height: 260px;

    padding: 2rem;

    background: var(--upload-bg);
    border: 2px dashed var(--upload-border);
    border-radius: var(--upload-radius);

    cursor: pointer;

    transition: var(--upload-transition);
}

.upload-dropzone:hover {
    background: var(--upload-bg-hover);
    border-color: var(--upload-border-hover);
}

.upload-dropzone.dragover {
    background: rgba(13, 110, 253, .05);
    border-color: var(--upload-border-hover);
}

.upload-dropzone input[type="file"] {
    display: none;
}

.upload-icon {
    font-size: 4rem;
    color: var(--upload-border-hover);
}

.upload-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.upload-subtitle {
    margin: 0;
    color: var(--upload-muted);
}

.preview-wrapper {
    display: none;
    margin-top: 1.5rem;
}

.preview-wrapper.show {
    display: block;
}

.preview-card {
    border: 1px solid #dee2e6;
    border-radius: .75rem;
    overflow: hidden;
}

.preview-image {
    width: 100%;
    max-height: 350px;
    object-fit: contain;
    background: #f8f9fa;
}

.preview-body {
    padding: 1rem;
}

.preview-name {
    font-weight: 600;
    word-break: break-word;
}

.preview-size {
    color: var(--upload-muted);
    font-size: .9rem;
}

.progress-wrapper {
    display: none;
    margin-top: 1.5rem;
}

.progress-wrapper.show {
    display: block;
}

.loading-overlay {
    position: absolute;
    inset: 0;

    display: none;
    justify-content: center;
    align-items: center;

    background: rgba(255, 255, 255, .85);
    border-radius: var(--upload-radius);
}

.loading-overlay.show {
    display: flex;
}

.btn-remove {
    min-width: 120px;
}

@media (max-width: 576px) {

    .upload-dropzone {
        min-height: 220px;
        padding: 1.5rem;
    }

    .upload-icon {
        font-size: 3rem;
    }

    .upload-title {
        font-size: 1.1rem;
    }

}