.article-content .code-fold {
    --code-fold-line-height: 1.5em;
    margin: 1.5em calc(-1 * var(--card-padding));
    width: calc(100% + 2 * var(--card-padding));
    background: var(--pre-background-color);
    color: var(--pre-text-color);
    scroll-margin-top: 24px;
}

.article-content .code-fold-viewport {
    position: relative;
    overflow: hidden;
}

.article-content .code-fold.is-collapsed .code-fold-viewport {
    max-height: calc(var(--code-fold-preview-lines) * var(--code-fold-line-height) + 2 * var(--card-padding));
}

.article-content .code-fold-short-preview.is-collapsed .code-fold-viewport {
    /* Top padding + two code lines; fade only the second, not the first. */
    max-height: calc(2 * var(--code-fold-line-height) + var(--card-padding));
}

.article-content .code-fold.is-collapsed .code-fold-viewport::after {
    content: '';
    position: absolute;
    inset: auto 0 0;
    height: calc(2.5 * var(--code-fold-line-height));
    background: linear-gradient(transparent, var(--pre-background-color));
    pointer-events: none;
}

.article-content .code-fold-short-preview.is-collapsed .code-fold-viewport::after {
    height: var(--code-fold-line-height);
}

.article-content .code-fold .highlight,
.article-content .code-fold pre {
    margin: 0;
    width: auto;
}

.article-content .code-fold-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    min-height: 48px;
    padding: 12px var(--card-padding);
    border: 0;
    border-top: 1px solid var(--table-border-color);
    border-bottom: 1px solid var(--table-border-color);
    background: var(--pre-background-color);
    color: var(--card-text-color-secondary);
    font: inherit;
    font-size: 13px;
    line-height: 1.5;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.article-content .code-fold-toggle:hover {
    background: color-mix(in srgb, var(--accent-color) 8%, var(--pre-background-color));
    color: var(--accent-color);
}

.article-content .code-fold-toggle:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: -3px;
    border-radius: 4px;
}

.article-content .code-fold-action {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

.article-content .code-fold-action::after {
    content: '';
    width: 6px;
    height: 6px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: translateY(2px) rotate(225deg);
    transition: transform 0.2s ease;
}

.article-content .is-collapsed .code-fold-action::after {
    transform: translateY(-2px) rotate(45deg);
}

.article-content .code-fold .copyCodeButton:focus-visible { opacity: 1; }

@media (hover: none) {
    .article-content .code-fold .copyCodeButton { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
    .article-content .code-fold-toggle,
    .article-content .code-fold-action::after { transition: none; }
}

@media print {
    .article-content .code-fold.is-collapsed .code-fold-viewport { max-height: none; }
    .article-content .code-fold-toggle,
    .article-content .code-fold-viewport::after { display: none; }
}