/* Blog table-of-contents sidebar
   Activated by .article-body.has-toc — JS only sets that class when the post
   has 4+ qualifying H2/H3 headings, so short posts are unaffected. */

.article-body.has-toc {
    display: grid;
    grid-template-columns: minmax(0, 1fr) min(720px, 100%) minmax(0, 1fr);
    gap: 3rem;
}

.article-body.has-toc > .container {
    grid-column: 2;
    min-width: 0;
}

.article-body.has-toc > .article-toc {
    grid-column: 3;
    max-width: 240px;
    width: 240px;
}

.article-toc {
    position: sticky;
    top: 5rem;
    align-self: start;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
}

.article-toc-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 0.85rem;
}

.article-toc nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.article-toc nav li {
    margin: 0;
    padding: 0;
    font-size: 0.88rem;
    line-height: 1.4;
}

.article-toc nav li[data-level="h2"] {
    margin-bottom: 0.55rem;
}

.article-toc nav li[data-level="h3"] {
    margin: 0.25rem 0 0.55rem 0.85rem;
}

.article-toc nav a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: 0.15rem 0;
    transition: color 0.15s;
}

.article-toc nav a:hover {
    color: var(--accent);
}

.article-toc nav a.is-active {
    color: var(--accent);
    font-weight: 600;
}

/* Keep anchor scroll position clear of the fixed nav (~70px high) */
.article-body.has-toc h2,
.article-body.has-toc h3 {
    scroll-margin-top: 5rem;
}

@media (max-width: 1100px) {
    .article-body.has-toc {
        grid-template-columns: min(720px, 100%);
        gap: 0;
    }
    .article-body.has-toc > .article-toc {
        display: none;
    }
    .article-body.has-toc h2,
    .article-body.has-toc h3 {
        scroll-margin-top: 0;
    }
}