/*
 * Custom change: Series/course layout (new file, not part of Rinne).
 * Loaded only by custom-series.hbs. Plain CSS, deployed as-is (no build/minify step).
 * Uses Rinne's CSS variables so colors, fonts and dark mode follow the theme.
 * Breakpoints match Rinne: md = 48em, lg = 62em.
 */

/* Mobile order: chapters, TOC, then content */
.series-layout__content { order: 1; }

@media only screen and (min-width: 62em) {
  .series-layout__content { order: 0; }
}

/* ---------- Chapter list (left column) ---------- */
.series-nav {
  margin-bottom: var(--gap-lg);
  padding: var(--gap);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--global-radius);
  background-color: var(--color-bg);
}

.series-nav__header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  cursor: pointer;
  color: var(--color-text);
}

.series-nav__header::-webkit-details-marker { display: none; }

.series-nav__eyebrow {
  width: 100%;
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-brand);
}

.series-nav__title {
  flex: 1;
  font-size: 1.1rem;
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  color: var(--color-text);
  transition: color var(--transition-200);
}

/* Series title links to the landing page */
a.series-nav__title:hover,
a.series-nav__title:focus-visible,
a.series-nav__title.is-current {
  color: var(--color-brand);
}

.series-nav__toggle { transition: transform var(--transition-200); }
.series-nav[open] .series-nav__toggle { transform: rotate(180deg); }

.series-nav__list {
  list-style: none;
  margin: var(--gap) 0 0;
  padding: 0;
  border-left: 2px solid hsla(var(--color-bg-base-reverse) / 8%);
}

.series-nav__item { margin: 0; padding: 0; }

.series-nav__link {
  display: block;
  margin-left: -2px;
  padding: 0.4em 0 0.4em var(--gap);
  border-left: 2px solid transparent;
  font-size: 0.9rem;
  font-weight: var(--font-weight-medium);
  line-height: 1.35;
  color: var(--color-text-acc);
  transition: color var(--transition-200), border-color var(--transition-200);
}

.series-nav__link:hover,
.series-nav__link:focus-visible {
  color: var(--color-brand);
  border-left-color: hsla(var(--color-bg-base-reverse) / 25%);
}

.series-nav__link.is-current {
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
  border-left-color: var(--color-brand);
}

.series-nav__section {
  margin: 0;
  padding: 1.25em 0 0.4em var(--gap);
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text);
}

.series-nav__section:first-child { padding-top: 0.25em; }

@media only screen and (min-width: 48em) {
  .series-nav__link { font-size: 0.95rem; }
}

/* Desktop: always expanded, sticky, no box */
@media only screen and (min-width: 62em) {
  .series-nav {
    position: sticky;
    top: var(--gap-lg);
    max-height: calc(100vh - 4em);
    overflow-y: auto;
    padding: 0;
    border: none;
    scrollbar-width: thin;
  }

  .series-nav__header { cursor: default; }
  .series-nav__toggle { display: none; }

  .header.is-pinned ~ .main .series-nav,
  .header[data-header="sticky"] ~ .main .series-nav {
    top: calc(var(--global-header-height) + 2em);
    max-height: calc(100vh - var(--global-header-height) - 4em);
  }
}

/* ---------- Right column: [ad + TOC] sticky, then CTA sticky ---------- */
/*
 * The column is split into two zones so the sticky blocks never overlap:
 * 1. .series-aside__main fills most of the column; the ad + TOC stick together inside it.
 *    The TOC list shrinks and scrolls if the ad is tall (300x600).
 * 2. .series-aside__cta is the last zone (min 60vh); the CTA sticks there near the end of the article,
 *    after the ad + TOC have scrolled away.
 */
.series-aside { height: auto; }

.series-layout .series-aside .post-toc.is-aside {
  position: static;
  margin-bottom: var(--gap-lg);
}

@media only screen and (min-width: 62em) {
  .series-layout__aside {
    display: flex;
    flex-direction: column;
  }

  .series-aside {
    flex: 1;
    display: flex;
    flex-direction: column;
  }

  .series-aside__main { flex: 1 0 auto; }

  .series-aside__sticky,
  .series-aside__cta .sidebar__section {
    position: sticky;
    top: var(--gap-lg);
  }

  .series-aside__sticky {
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 4em);
    margin-bottom: var(--gap-lg);
  }

  .series-aside__ad { flex: none; }

  .series-aside__sticky .post-toc.is-rendered {
    display: flex;
    flex-direction: column;
    min-height: 0;
    margin-bottom: 0;
  }

  .series-aside__sticky .post-toc__content {
    flex: 1 1 auto;
    min-height: 0;
    max-height: none;
  }

  .series-aside__cta {
    flex: none;
    min-height: 60vh;
  }

  .series-aside__cta .sidebar__section { margin-bottom: 0; }

  .header.is-pinned ~ .main .series-aside__sticky,
  .header.is-pinned ~ .main .series-aside__cta .sidebar__section,
  .header[data-header="sticky"] ~ .main .series-aside__sticky,
  .header[data-header="sticky"] ~ .main .series-aside__cta .sidebar__section {
    top: calc(var(--global-header-height) + 2em);
  }

  .header.is-pinned ~ .main .series-aside__sticky,
  .header[data-header="sticky"] ~ .main .series-aside__sticky {
    max-height: calc(100vh - var(--global-header-height) - 4em);
  }
}

/* ---------- Previous / next chapter ---------- */
.series-pagination {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin: var(--gap-lg) auto;
}

.series-pagination__spacer { display: none; }

.series-pagination__link {
  display: flex;
  flex-direction: column;
  gap: 0.35em;
  padding: 1em 1.25em;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--global-radius);
  transition: border-color var(--transition-200), box-shadow var(--transition-200);
}

.series-pagination__link.is-next {
  align-items: flex-end;
  text-align: right;
}

.series-pagination__link:hover,
.series-pagination__link:focus-visible {
  border-color: var(--color-brand);
  box-shadow: 0 5px 20px 0 rgb(0 0 0 / 8%);
}

.series-pagination__label {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-size: 0.8rem;
  font-weight: var(--font-weight-semi-bold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-acc);
}

.series-pagination__title {
  font-size: 1rem;
  font-weight: var(--font-weight-semi-bold);
  line-height: 1.3;
  color: var(--color-text);
  transition: color var(--transition-200);
}

.series-pagination__link:hover .series-pagination__title,
.series-pagination__link:focus-visible .series-pagination__title {
  color: var(--color-brand);
}

@media only screen and (min-width: 48em) {
  .series-pagination { grid-template-columns: 1fr 1fr; }
  .series-pagination__spacer { display: block; }
}