/* ==========================================================================
   Books page (/upsc-law-optional-books) — page head, subject pills,
   "books at a glance" cards, subject blocks with topic lists, PDF links,
   FAQ and closing CTA. Requires tokens.css + base.css.

   .page-head / .crumbs / .pills are the same component as on the toppers'
   copy page (copies.css); see pages/books/SHARED_REQUESTS.md.
   ========================================================================== */

/* Page head ------------------------------------------------------------ */
.page-head { padding-block: var(--s-3) var(--s-4); border-bottom: 1px solid var(--c-line); scroll-margin-top: var(--s-2); }
.page-head__inner { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s-3); }
.page-head__text { display: grid; gap: var(--s-2); min-width: 0; }
.page-head__title { font-size: var(--fs-h1); }
.page-head__intro { max-width: 70ch; color: var(--c-text-muted); }
.page-head__actions { display: grid; gap: var(--s-1); min-width: 0; }
.page-head__note { color: var(--c-text-muted); font-size: var(--fs-sm); }

/* Breadcrumb */
.crumbs ol { display: flex; flex-wrap: wrap; gap: 0 var(--s-1); font-size: var(--fs-sm); color: var(--c-text-muted); }
.crumbs li + li::before { content: "\203A"; margin-right: var(--s-1); color: var(--c-text-muted); }
.crumbs a { color: var(--c-link-text); text-decoration: none; display: inline-flex; align-items: center; min-height: 28px; }
.crumbs a:hover { text-decoration: underline; }

/* Subject pills, grouped by paper; they wrap instead of scrolling */
.subject-nav { display: grid; gap: var(--s-2); }
.subject-nav__group { display: grid; gap: var(--s-1); }
.subject-nav__label {
  font-family: var(--ff-display);
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-red-text);
}
.pills { display: flex; flex-wrap: wrap; gap: var(--s-1); }
.pill {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-min);
  padding: 0 var(--s-2);
  font-family: var(--ff-display);
  font-size: 1rem;
  color: var(--c-slate);
  background: var(--c-white);
  border: 1px solid var(--c-slate);
  border-radius: 999px;
  text-decoration: none;
  transition: background var(--ease), color var(--ease);
}
.pill:hover { background: var(--c-slate); color: var(--c-white); }

@media (min-width: 960px) {
  .page-head { padding-block: var(--s-4) var(--s-5); }
  .page-head__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas: "crumbs crumbs" "text actions" "nav nav";
    column-gap: var(--s-6);
    row-gap: var(--s-3);
  }
  .page-head__inner > .crumbs { grid-area: crumbs; }
  .page-head__text { grid-area: text; }
  .page-head__actions { grid-area: actions; align-self: start; width: 280px; padding-top: var(--s-1); }
  .page-head__actions .btn-row { flex-direction: column; }
  .page-head__inner > .subject-nav { grid-area: nav; }
  .subject-nav { grid-template-columns: auto auto; justify-content: start; column-gap: var(--s-6); }
}

/* Books at a glance ----------------------------------------------------- */
.glance__item { gap: var(--s-1); }
.glance__kind {
  font-family: var(--ff-display);
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-red-text);
}
.glance__name { margin-bottom: var(--s-1); }
.glance__subjects {
  margin-top: auto;
  padding-top: var(--s-2);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1);
}
/* 36px chip + 4px invisible hit area above and below = 44px tap target, row pitch 44px */
.chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 0.6rem;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--c-navy);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  text-decoration: none;
  white-space: nowrap;
}
.chip::before { content: ""; position: absolute; inset: -4px 0; }
.chip:hover { background: var(--c-navy); border-color: var(--c-navy); color: var(--c-white); }

/* Subject blocks --------------------------------------------------------- */
.subject { scroll-margin-top: var(--s-3); padding-block: var(--s-4); border-top: 1px solid var(--c-line); }
.subject:first-of-type { border-top: 0; padding-top: 0; }
.subject:last-of-type { padding-bottom: 0; }
.subject__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s-1) var(--s-2);
  margin-bottom: var(--s-2);
}
.subject__title { font-size: var(--fs-h2); }
.subject__meta { color: var(--c-text-muted); font-size: var(--fs-sm); white-space: nowrap; }

/* Main books row */
.subject__books {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-1) var(--s-2);
  margin-bottom: var(--s-3);
}
.subject__books-label { font-family: var(--ff-display); font-size: var(--fs-sm); color: var(--c-text-muted); white-space: nowrap; }
.book-chips { display: flex; flex-wrap: wrap; gap: var(--s-1); }
.book-chip {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0.2rem 0.6rem;
  font-family: var(--ff-display);
  font-size: var(--fs-sm);
  letter-spacing: 0.02em;
  color: var(--c-white);
  background: var(--c-charcoal);
  border-radius: var(--radius-sm);
}

/* Topic list: one row per topic group = syllabus wording + what to read */
.topic-list { display: grid; gap: var(--s-2); }
.topic {
  display: grid;
  gap: var(--s-2);
  padding: var(--s-2);
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}
.section--tint .topic { border-color: transparent; box-shadow: var(--shadow-card); }
.topic__syllabus { display: grid; gap: var(--s-1); min-width: 0; }
.topic__label,
.topic__read-label {
  font-family: var(--ff-display);
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}
.topic__items { display: grid; gap: var(--s-1); counter-reset: none; }
.topic__items li {
  position: relative; /* for the number marker only */
  padding-left: 2.25rem;
  font-family: var(--ff-serif);
  color: var(--c-text);
}
.topic__items li::before {
  content: counter(list-item) ".";
  position: absolute;
  left: 0;
  top: 0;
  width: 1.75rem;
  font-family: var(--ff-display);
  color: var(--c-slate);
  text-align: right;
}
.topic__read {
  display: grid;
  gap: var(--s-1);
  padding: var(--s-2);
  background: var(--c-surface);
  border-left: 4px solid var(--c-red-text);
  border-radius: 0 var(--radius) var(--radius) 0;
  min-width: 0;
}
.topic__read-label { color: var(--c-red-text); }
.topic__links { display: grid; gap: 2px; margin-top: var(--s-1); }

/* PDF / article links: 44px tall rows with a small PDF tag */
.pdf-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
  min-height: var(--tap-min);
  color: var(--c-link-text);
  text-decoration: none;
  overflow-wrap: anywhere;
}
.pdf-link:hover { color: var(--c-slate); text-decoration: underline; }
.pdf-link__tag {
  flex: 0 0 auto;
  padding: 0.1rem 0.4rem;
  font-family: var(--ff-display);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-white);
  background: var(--c-red-text);
  border-radius: var(--radius-sm);
}
.subject__foot { margin-top: var(--s-2); display: flex; justify-content: flex-end; }

@media (min-width: 640px) {
  .topic { padding: var(--s-3); }
}
@media (min-width: 960px) {
  .subject { padding-block: var(--s-5); }
  .topic { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: var(--s-4); }
  .topic__read { align-self: start; }
}

/* Free PDFs index ----------------------------------------------------------- */
.pdf-tile { gap: var(--s-1); }
.pdf-tile .tile__body { font-size: var(--fs-sm); }
.pdf-list { display: grid; gap: 2px; }
@media (min-width: 960px) {
  /* a subject with many files takes two columns, links in two columns, so the grid has no empty slot */
  .pdf-tile--wide { grid-column: span 2; }
  .pdf-tile--wide .pdf-list { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--s-3); }
}

/* FAQ ------------------------------------------------------------------------ */
.faq { max-width: 760px; margin-inline: auto; display: grid; gap: var(--s-1); }
.faq__item { background: var(--c-white); border: 1px solid var(--c-line); border-radius: var(--radius); }
.faq__item[open] { box-shadow: var(--shadow-card); }
.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-2);
  min-height: var(--tap-min);
  padding: var(--s-1) var(--s-2);
  font-family: var(--ff-display);
  font-size: 1.0625rem;
  color: var(--c-slate);
  cursor: pointer;
  list-style: none;
}
.faq__q::-webkit-details-marker { display: none; }
.faq__q::after {
  content: "+";
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--c-red-text);
  border: 1px solid var(--c-line);
  border-radius: 50%;
}
.faq__item[open] .faq__q::after { content: "\2212"; }
.faq__q:hover { color: var(--c-charcoal); }
.faq__a { padding: 0 var(--s-2) var(--s-2); color: var(--c-text-muted); }

/* Closing CTA ------------------------------------------------------------ */
.cta-band .section__head { margin-bottom: var(--s-3); }
.cta-band__buttons { justify-content: center; }
@media (min-width: 640px) {
  .cta-band__buttons .btn { min-width: 180px; }
}