/* css/book.css — Book detail page (dynamic)
   - Uses global primitives from css/style.css
   - Shared structural shell now lives in css/style.css
   - This file owns book-page ambience, art direction, and related-volumes polish
*/

.book-page {
  position: relative;
}

/* ---------- Wave AG — Book ambience (CSP-safe, low-perf gated) ---------- */
.book-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;

  /* Base ambience layers (token-native; no hard-coded colors) */
  opacity: var(--book-bg-opacity, 0.30);
  background:
    radial-gradient(circle at 25% 20%, rgba(var(--accent-rgb), 0.18), rgba(var(--bg-rgb), 0.05) 45%),
    radial-gradient(circle at 70% 40%, rgba(var(--focus-rgb), 0.10), rgba(var(--bg-rgb), 0.10) 55%),
    radial-gradient(circle at 40% 80%, rgba(var(--accent-rgb), 0.08), rgba(var(--bg-rgb), 0.10) 60%),
    linear-gradient(180deg, rgba(var(--bg-rgb), 0.25), rgba(var(--bg-rgb), 0.65));
}

.book-bg__img {
  position: absolute;
  inset: -12%;
  width: 124%;
  height: 124%;
  object-fit: cover;
  opacity: var(--book-bg-img-opacity, 0.18);
  transform: translateZ(0) scale(var(--book-bg-scale, 1.12));
  filter: blur(var(--book-bg-blur, 22px)) saturate(var(--book-bg-sat, 1.18));
}

html[data-perf="low"] .book-bg__img {
  opacity: 0.12;
  filter: none;
  transform: translateZ(0) scale(1.02);
}

@media (prefers-reduced-motion: reduce) {
  .book-bg__img { transform: translateZ(0) scale(1.02); }
}

@media (prefers-reduced-transparency: reduce) {
  .book-bg { opacity: 0.18; }
  .book-bg__img { opacity: 0.10; filter: none; }
}

@media (forced-colors: active) {
  .book-bg { display: none; }
}

/* Shared structural book-detail shell lives in css/style.css.
   Keep only book-page-local ambience + cover art direction here. */
.book-hero__bg {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.book-hero__bg img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: var(--hero-banner-object-position, 50% 30%);
  transform: scale(1.035);
  filter: saturate(1.06) contrast(1.08);
}

.book-hero--detail::before {
  content: none;
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(1200px 700px at 50% 22%, rgba(0,0,0,0.12), rgba(0,0,0,0.64) 70%),
    linear-gradient(180deg, rgba(11,12,16,0.10), rgba(11,12,16,0.74));
}

/* ---------- Wave R: Cover polish (premium framing, theme-safe) ---------- */
.book-hero__cover::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: var(--cover-overlay-gradient);
  mix-blend-mode: var(--cover-overlay-blend);
}

/* Wave S: book template empty state */
.book-empty {
  max-width: 1100px;
  margin: 18px auto 0;
  padding: 0 14px;
}

/* -----------------------------
   Related volumes grid (book pages)
   ----------------------------- */
.series-grid__head {
  display: grid;
  gap: 6px;
  margin: 0 0 10px;
}

.series-grid__kicker {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
}

.series-grid__title {
  font-size: clamp(18px, 2.1vw, 22px);
  margin: 0;
}

.series-grid__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 14px;
}

.series-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.series-grid__item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.04);
  text-decoration: none;
  color: inherit;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.series-grid__item:hover {
  transform: translateY(-1px);
  border-color: rgba(208, 167, 58, 0.32);
  background: rgba(255, 255, 255, 0.06);
}

.series-grid__item:focus-visible {
  outline: 2px solid rgba(208, 167, 58, 0.85);
  outline-offset: 3px;
}

.series-grid__item.is-current {
  border-color: rgba(208, 167, 58, 0.55);
  background: rgba(208, 167, 58, 0.08);
}

.series-grid__img {
  width: 72px;
  height: 110px;
  border-radius: 10px;
  object-fit: cover;
  background: rgba(255, 255, 255, 0.06);
}

.series-grid__meta {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.series-grid__vol {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.74);
}

.series-grid__name {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 920px) {
  .series-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .series-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Large-tier polish (Wave V10-10) ---------- */

@media (min-width: 1601px) {
  .series-grid {
    gap: 16px;
  }

  .series-grid__item {
    grid-template-columns: 82px 1fr;
    gap: 14px;
    padding: 14px;
  }

  .series-grid__img {
    width: 82px;
    height: 124px;
  }

  .series-grid__name {
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
  }
}

/* =========================================================
   Mobile Small hardening (320–359)
   - Prevent store actions from wrapping into awkward double rows
   - Keep region selector tappable and legible
   ========================================================= */

/* ---------- Detail-page utility continuity (Wave V10-19) ---------- */
@media (min-width: 1401px) {
  .series-grid {
    gap: 14px;
  }

  .book-section {
    margin-top: 30px;
  }
}

@media (max-width: 359px) {
  .book-actions {
    grid-template-columns: 1fr;
  }
}