/* =========================================================
   BOOKS PAGE — refinement layer
   Load AFTER style.css and home-refine.css:
     style.css → home-refine.css → books-refine.css
   Goal: catalog-grade polish on desktop, and a mobile layout
   where NOTHING extra is pinned to the screen.
   ========================================================= */

/* ---------- 0. tokens local to this page ---------- */
:root {
  --bk-gap: clamp(1rem, 2.4vw, 1.8rem);
  --bk-section-y: clamp(2.75rem, 6vw, 5rem);
  --bk-measure: 68ch;
}

/* ---------- 1. skip link ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 2000;
  background: var(--ink);
  color: var(--light-text);
  font-family: var(--mono);
  font-size: .8rem;
  padding: .7rem 1.1rem;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  left: 0;
}

:where(a, button, input, [tabindex]):focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 2. section rhythm ---------- */
main#main-content>section {
  padding-block: var(--bk-section-y);
}

.library-intro p {
  max-width: var(--bk-measure);
}

.library-intro h2,
main#main-content>section>h2 {
  font-family: var(--serif-display);
  font-size: clamp(1.5rem, 1.05rem + 1.9vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

main#main-content>section>h2+p {
  max-width: var(--bk-measure);
  color: var(--muted-dark);
}

body.theme-dark main#main-content>section>h2+p {
  color: var(--muted-light);
}

/* section heading gets a quiet gilt rule instead of a heavy bar */
main#main-content>section>h2::after {
  content: "";
  display: block;
  width: 76px;
  height: 2px;
  margin-top: .7rem;
  background: linear-gradient(90deg, var(--gold-bright), transparent);
}


/* ---------- 4. book grid ---------- */
.book-grid {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr));
  gap: var(--bk-gap);
  align-items: stretch;
}

@media (max-width: 560px) {

  /* two slim catalog cards per row reads better than one huge one */
  .book-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .85rem;
  }
}

@media (max-width: 360px) {
  .book-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 5. the card ---------- */
.book-card {
  min-width: 0;
  border-style: solid;
  border-color: color-mix(in oklab, var(--paper-line) 85%, transparent);
  box-shadow: 0 1px 2px rgba(20, 22, 31, .05), 0 10px 26px rgba(20, 22, 31, .07);
  transition: transform .3s cubic-bezier(.2, .7, .3, 1), box-shadow .3s ease, border-color .3s ease;
}

/* stitched inner hairline — catalog card feel */
.book-card::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed color-mix(in oklab, var(--paper-line) 70%, transparent);
  border-radius: 2px;
  pointer-events: none;
  opacity: .55;
}

.book-card:hover {
  border-color: var(--gold);
}

/* only lift on real pointers — no sticky hover states on touch */
@media (hover:none),
(pointer:coarse) {
  .book-card:hover {
    transform: none;
    box-shadow: var(--shadow-card);
  }

  .book-card:hover .book-cover img {
    transform: none;
  }
}

.book-cover {
  aspect-ratio: 3/4;
  background: linear-gradient(160deg, var(--theme-cover-start), var(--theme-cover-end));
}

.book-cover img {
  object-fit: contain;
  padding: .6rem;
}

.book-card .book-content {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1rem 1rem 1.1rem;
  flex: 1;
}

.book-card h3 {
  font-family: var(--serif-display);
  font-size: clamp(1rem, .93rem + .3vw, 1.16rem);
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.book-card h4 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted-dark);
}

body.theme-dark .book-card h4 {
  color: var(--muted-light);
}

.book-description {
  font-size: .9rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

@media (max-width: 560px) {
  .book-description {
    font-size: .82rem;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
}

/* meta rows become small chips instead of loose text */
.book-info {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: 0;
}

.book-info span {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .04em;
  padding: .25rem .5rem;
  border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--paper-line) 80%, transparent);
  background: color-mix(in oklab, var(--parchment) 70%, transparent);
  color: var(--muted-dark);
  white-space: nowrap;
}

body.theme-dark .book-info span {
  background: color-mix(in oklab, var(--ink-soft) 70%, transparent);
  border-color: var(--ink-line);
  color: var(--muted-light);
}

.difficulty {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .05em;
  text-transform: uppercase;
}

/* read button — full width foot of the card, thumb-friendly */
.book-card .read-btn {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  min-height: 44px;
  padding: .6rem 1rem;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background .25s ease, color .25s ease, transform .2s ease;
}

@media (max-width: 560px) {
  .book-card .read-btn {
    font-size: .66rem;
    padding: .55rem .5rem;
  }
}

/* ---------- 6. feature blocks ---------- */
.book-month .featured-book,
.spotlight .spotlight-card {
  gap: clamp(1.2rem, 3vw, 2.4rem);
  align-items: center;
}

.book-month img,
.spotlight img {
  border-radius: 2px;
  box-shadow: 0 14px 34px rgba(20, 22, 31, .18);
}

.quote blockquote,
.quote p {
  max-width: 60ch;
  margin-inline: auto;
  text-wrap: pretty;
}

/* responsive tables / level cards never overflow */
.reading-levels .levels {
  gap: clamp(1rem, 3vw, 2.2rem);
}

main#main-content img {
  max-width: 100%;
  height: auto;
}

/* ---------- 7. reveal on scroll (desktop + mobile, cheap) ---------- */
.bk-reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s ease, transform .55s cubic-bezier(.2, .7, .3, 1);
  will-change: opacity, transform;
}

.bk-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .bk-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .book-card,
  .book-cover img {
    transition: none !important;
  }
}