/* Layout */

.qr-tool {
    --qr-stage-gap: 1rem;
    --qr-stage-item-gap: 0.5rem;
}

.qr-tool [hidden] {
    display: none !important;
}

:where(article) form.qr-tool {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
}

.qr-stage {
    display: flex;
    flex-direction: column;
    gap: var(--qr-stage-gap);
    min-width: 0;
}

.qr-controls {
    display: grid;
    gap: 1rem;
    min-width: 0;
}

/* Preview */

.qr-preview {
    width: 100%;
    max-width: 20rem;
    margin-inline: auto;
}

.qr-preview-box {
    display: grid;
    place-items: center;
    width: 100%;
    aspect-ratio: 1;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

.qr-preview-box.is-zoomable {
    cursor: zoom-in;
}

.qr-preview-box.is-zoomable:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

.qr-preview-box > svg {
    display: block;
    width: 100%;
    height: 100%;
}

.qr-preview-box.is-transparent {
    background-image: linear-gradient(45deg, var(--border-color) 25%, transparent 25%, transparent 75%, var(--border-color) 75%), linear-gradient(45deg, var(--border-color) 25%, transparent 25%, transparent 75%, var(--border-color) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 8px 8px;
}

.qr-empty {
    padding: 1.5rem;
    text-align: center;
    font-size: 0.875rem;
}

.qr-preview figcaption {
    margin-top: var(--qr-stage-gap);
    text-align: center;
    white-space: pre-line;
    font-variant-numeric: tabular-nums;
}

.qr-feedback,
.qr-notes {
    display: grid;
    gap: var(--qr-stage-item-gap);
}

.qr-note {
    padding: 0.5rem 0.75rem;
    border: 1px dashed var(--text-color);
    color: var(--text-color);
    font-size: 0.875rem;
}

.qr-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--qr-stage-item-gap);
}

:where(article form) button.qr-primary {
    background: var(--text-color);
    color: var(--bg-color);
}

@media (hover: hover) {
    :where(article form) button.qr-primary:not(:disabled):hover {
        background: var(--text-muted);
    }

    .qr-preview-box.is-zoomable:hover {
        border-color: var(--text-muted);
    }
}

/* Controls */

.qr-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
}

.qr-colors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qr-row > div > * + *,
.qr-field > * + * {
    margin-top: 0.375rem;
}

.qr-panel > * + * {
    margin-top: 0.75rem;
}

.qr-tool button.qr-wide {
    width: 100%;
}

.qr-tool output {
    font-variant-numeric: tabular-nums;
}

@media (max-width: 480px) {
    .qr-row,
    .qr-colors,
    .qr-actions {
        grid-template-columns: minmax(0, 1fr);
    }
}

/* Desktop */

@media (min-width: 720px) {
    :where(article) form.qr-tool {
        grid-template-columns: minmax(0, 16rem) minmax(0, 1fr);
        gap: 2rem;
    }

    .qr-stage {
        position: sticky;
        top: calc(4.5rem + 41px + var(--form-legend-half));
        margin-top: var(--form-legend-half);
    }

    .qr-preview {
        max-width: none;
    }
}