/* Deep-dive pages (/on/<slug>/) — fixed left contents rail + embedded film
   figures, inside the shared article system. Tokens come from site.css. */

.deep-dive .article-body h2[id],
.deep-dive .article-body h3[id] {
  scroll-margin-top: 24px;
}

.deep-dive .article-body {
  max-width: none;
}

/* contents */

.dd-toc-toggle {
  appearance: none;
  background: var(--chip);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
  min-height: 44px;
  cursor: pointer;
  text-align: left;
}

.dd-toc-list {
  display: none;
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.dd-toc.open .dd-toc-list {
  display: block;
}

.dd-toc-list > li {
  margin: 0 0 14px;
}

.dd-toc-list > li > a {
  font-family: var(--font-text);
  font-weight: 700;
  font-size: var(--size-body-ui);
  color: var(--text);
  text-decoration: none;
}

.dd-toc-list ol {
  list-style: none;
  margin: 6px 0 0;
  padding: 0 0 0 12px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 5px;
}

.dd-toc-list ol a {
  display: block;
  padding: 2px 0;
  font-size: var(--size-body-ui);
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
}

.dd-toc-list a:hover {
  color: var(--text);
}

.dd-toc-list a[aria-current] {
  color: var(--accent);
}

@media (min-width: 960px) {
  .deep-dive .article-grid {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .dd-toc-toggle {
    display: none;
  }

  .dd-toc-list {
    display: block;
  }

  .dd-rail {
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    scrollbar-width: thin;
  }
}

/* embedded films */

.dd-video {
  margin: 28px 0;
}

.dd-video .video-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-media);
  background: #000;
}

.dd-video .video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.dd-video figcaption {
  margin-top: 10px;
  font-size: var(--size-body-ui);
  color: var(--muted);
}

@media (prefers-reduced-motion: no-preference) {
  html:has(.deep-dive) {
    scroll-behavior: smooth;
  }
}