/* =========================================================================
   Livres / boutique : liste /books/ (books.njk), fiche (layouts/book.njk),
   bloc d'achat (partials/buy.njk). Préfixe .bk- pour ne pas gêner les autres pages.
   ========================================================================= */

/* ---------- Couvertures : tranche de pages visible (livre en volume) ---------- */
.bk-page .book-cover {
  box-shadow:
    1px 1px 0 #e9e1cf, 2px 2px 0 #cfc5b1, 3px 2px 0 #e9e1cf, 4px 3px 0 #c4b9a3,
    0 1px 1px rgba(0,0,0,.25), 0 14px 24px -8px rgba(0,0,0,.5), 0 34px 70px -24px rgba(0,0,0,.6);
}

/* ---------- Statut et bloc d'achat ---------- */
.status--available { color: #1e6b61; }          /* sur papier : 5.6:1 */
.status--request   { color: var(--brass-deep); }
.status--soon      { color: var(--ink-soft); }
.on-dark .status--available { color: var(--glow); }
.on-dark .status--request   { color: var(--brass); }
.on-dark .status--soon      { color: var(--on-dark-soft); }

.buy { margin: 1.75rem 0 0; }
.buy p { margin: 0; }
.buy-status { margin-bottom: 1rem !important; }
.buy-action { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; }
.buy .btn { min-height: 2.75rem; }
.buy-format { font: 400 .8125rem/1.4 var(--mono); letter-spacing: .04em; color: var(--ink-soft); }
.on-dark .buy-format { color: var(--on-dark-soft); }
.buy-also, .buy-note { margin-top: .85rem !important; font-size: .9375rem; color: var(--ink-soft); }
.on-dark .buy-also, .on-dark .buy-note { color: var(--on-dark-soft); }
.on-dark .buy-also a, .on-dark .buy-note a { color: var(--on-dark); }
.buy--compact { margin-top: 1.25rem; }
.buy--compact .buy-status { margin-bottom: .75rem !important; }
.buy--compact .link-arrow { display: inline-block; padding-block: .65rem .3rem; color: var(--ink); }
.buy--compact .buy-note { margin-top: 0 !important; }
.bk-more { margin: 1.5rem 0 0; }
.bk-more .link-arrow { display: inline-block; padding-block: .65rem .3rem; }

.bk-subtitle { font: italic 400 1.15rem/1.35 var(--serif); margin: -.15rem 0 .9rem; color: var(--ink-soft); }
.on-dark .bk-subtitle { color: var(--on-dark-soft); }

/* ---------- Liste : en-tête « abysse » ---------- */
.bk-hero {
  position: relative; overflow: hidden; isolation: isolate;
  padding: clamp(3.5rem, 9vw, 7.5rem) 0 clamp(4rem, 9vw, 7rem);
  background:
    radial-gradient(60rem 40rem at 78% 105%, rgba(116, 214, 200, .16), transparent 65%),
    radial-gradient(40rem 26rem at 12% -10%, rgba(214, 165, 74, .10), transparent 70%),
    linear-gradient(180deg, var(--abyss) 0%, #081013 55%, #06191b 100%);
}
/* Anneaux de sonar autour de la couverture mise en avant (décor CSS) */
.bk-hero::before {
  content: ""; position: absolute; z-index: -1; width: 78rem; height: 78rem; right: -24rem; bottom: -34rem;
  border-radius: 50%; pointer-events: none;
  background: repeating-radial-gradient(circle, transparent 0 5.5rem, rgba(116, 214, 200, .07) 5.5rem calc(5.5rem + 1px));
  -webkit-mask-image: radial-gradient(circle, #000 25%, transparent 70%); mask-image: radial-gradient(circle, #000 25%, transparent 70%);
}
.bk-hero h1 { font-size: clamp(3.2rem, 1.8rem + 6.5vw, 7.5rem); line-height: .95; margin-bottom: .3em; letter-spacing: -.03em; }
.bk-hero .lead { max-width: 38rem; color: var(--on-dark); }
.bk-hero-essay { max-width: 38rem; color: var(--on-dark-soft); }
.bk-hero-essay cite { font-family: var(--serif); font-style: italic; }

/* Livre mis en avant */
.bk-feature {
  display: grid; gap: 2.5rem; align-items: center;
  margin-top: clamp(3rem, 7vw, 5.5rem); padding-top: clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--line-dark);
}
.bk-feature-cover { display: block; width: min(72%, 20rem); margin-inline: auto; perspective: 1400px; }
.bk-feature-text { max-width: 38rem; }
.bk-tag span { color: var(--glow); margin-right: .6em; text-transform: uppercase; letter-spacing: .14em; }
.bk-tag span::after { content: " ·"; color: var(--on-dark-soft); }
.bk-feature-title { font-size: clamp(2.8rem, 1.6rem + 5vw, 5.5rem); line-height: .95; margin: .35rem 0 .25em; letter-spacing: -.03em; }
.bk-feature-title a, .bk-card h3 a, .bk-essay-book h3 a { text-decoration: none; color: inherit; }
.bk-feature-title a:hover, .bk-card h3 a:hover, .bk-essay-book h3 a:hover { text-decoration: underline; text-decoration-thickness: 1px; text-decoration-color: var(--brass); }
.bk-feature .bk-subtitle { font-size: clamp(1.25rem, 1.1rem + .6vw, 1.6rem); }
.bk-synopsis { max-width: 40rem; }
.bk-feature .bk-synopsis { font-size: 1.125rem; }
.bk-note { font: 400 .875rem/1.6 var(--mono); color: var(--on-dark-soft); padding-left: 1rem; border-left: 1px solid var(--brass); max-width: 36rem; }

@media (min-width: 52rem) {
  .bk-feature { grid-template-columns: minmax(16rem, 5fr) 7fr; gap: clamp(3rem, 6vw, 6rem); }
  .bk-feature-cover { width: 100%; max-width: 26rem; }
  .bk-feature-cover .book-cover { transform: rotateY(14deg) rotateX(2deg); transform-origin: left center; }
  .bk-feature-cover:hover .book-cover { transform: rotateY(6deg) translateY(-6px); }
}

/* ---------- Étagère des romans (fond papier) ---------- */
.bk-shelf-section { padding: var(--section) 0; background: var(--paper); }
.bk-section-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.bk-section-head h2 { margin: 0; }
.bk-shelf { display: grid; gap: 4rem clamp(2rem, 4vw, 3.5rem); margin: 0; padding: 0; list-style: none; grid-template-columns: 1fr; }
@media (min-width: 40rem) and (max-width: 59.99rem) { .bk-shelf { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 60rem) { .bk-shelf { grid-template-columns: repeat(3, 1fr); } }
.bk-card { display: flex; flex-direction: column; }
.bk-card-cover {
  position: relative; display: flex; justify-content: center; align-items: flex-end;
  padding: 2rem 0 1.75rem; margin-bottom: 1.75rem;
}
/* Planche de l'étagère sous la couverture */
.bk-card-cover::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: .9rem; border-radius: 1px;
  background: linear-gradient(180deg, var(--paper-3), #d3c6ad 70%, #c2b497);
  box-shadow: 0 10px 18px -10px rgba(22, 27, 29, .45);
}
.bk-card-cover .book-cover { width: min(68%, 15rem); position: relative; z-index: 1; }
.bk-card h3 { margin: .15rem 0 .35rem; }
.bk-card .bk-synopsis { font-size: 1rem; color: var(--ink-soft); }
.bk-card .buy { margin-top: auto; padding-top: 1rem; }

/* ---------- Essai : ciel steampunk (fond sombre) ---------- */
.bk-essay { position: relative; overflow: hidden; isolation: isolate; padding: var(--section) 0; }
.bk-essay-bg { position: absolute; inset: 0; z-index: -2; }
.bk-essay-bg picture { display: block; height: 100%; } /* sinon l'image ne couvre qu'une bande en haut de la section */
.bk-essay-bg img { width: 100%; height: 100%; object-fit: cover; object-position: center 30%; }
.bk-essay::before { /* voile pour le contraste du texte (AA) */
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(90deg, rgba(11, 18, 20, .55) 0%, rgba(11, 18, 20, .82) 45%, rgba(11, 18, 20, .94) 70%),
    linear-gradient(180deg, rgba(11, 18, 20, .6), rgba(11, 18, 20, .2) 40%, rgba(11, 18, 20, .85));
}
.bk-essay-book { display: grid; gap: 2.5rem; align-items: center; }
.bk-essay-cover { display: block; width: min(70%, 17rem); }
.bk-essay-text { max-width: 40rem; }
.bk-essay-book h3 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.4rem); margin: .25rem 0 .3em; }
@media (min-width: 48rem) {
  .bk-essay-book { grid-template-columns: minmax(14rem, 18rem) 1fr; gap: clamp(3rem, 6vw, 6rem); }
  .bk-essay-cover { width: 100%; }
  .bk-essay-text { justify-self: end; }
}
@media (max-width: 47.99rem) {
  .bk-essay::before { background: rgba(11, 18, 20, .86); }
}

/* ---------- Fiche livre ---------- */
.bk-detail-hero { position: relative; overflow: hidden; isolation: isolate; padding: 2rem 0 clamp(4rem, 8vw, 6.5rem);
  background: radial-gradient(50rem 30rem at 20% 100%, rgba(116, 214, 200, .10), transparent 70%), var(--abyss); }
/* Halo flou tiré de la couverture (décoratif) */
.bk-detail-glow { position: absolute; z-index: -1; left: -10%; top: -20%; width: 70%; height: 140%; opacity: .35; pointer-events: none; }
.bk-detail-glow picture, .bk-detail-glow img { width: 100%; height: 100%; object-fit: cover; filter: blur(70px) saturate(1.3); }
.bk-detail-hero::after { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: linear-gradient(90deg, transparent 30%, rgba(11, 18, 20, .75) 65%, var(--abyss)); }

.bk-crumbs ol { display: flex; flex-wrap: wrap; gap: .25rem .6rem; margin: 0 0 clamp(2rem, 5vw, 3.5rem); padding: 0; list-style: none; }
.bk-crumbs li + li::before { content: "/"; margin-right: .6rem; color: var(--brass); }
.bk-crumbs a { display: inline-block; padding-block: .8rem; color: var(--on-dark); }
.bk-crumbs li:last-child span { display: inline-block; padding-block: .8rem; }

.bk-detail-grid { display: grid; gap: 3rem; align-items: center; }
.bk-detail-cover { width: min(78%, 22rem); margin-inline: auto; perspective: 1400px; }
.bk-detail-text h1 { font-size: clamp(2.8rem, 1.6rem + 5vw, 6rem); line-height: .95; letter-spacing: -.03em; margin-bottom: .2em; }
.bk-detail-subtitle { font: italic 400 clamp(1.3rem, 1.1rem + .9vw, 1.9rem)/1.25 var(--serif); color: var(--on-dark-soft); margin: 0 0 .75rem; }
.bk-byline { margin-bottom: 2rem; }
.bk-detail-text .lead { max-width: 40rem; color: var(--on-dark); }
@media (min-width: 56rem) {
  .bk-detail-grid { grid-template-columns: minmax(18rem, 5fr) 7fr; gap: clamp(3rem, 7vw, 7rem); }
  .bk-detail-cover { width: 100%; max-width: 26rem; }
  .bk-detail-cover .book-cover { transform: rotateY(12deg); transform-origin: left center; }
}

.bk-detail-body { background: var(--paper); padding: clamp(3.5rem, 8vw, 6rem) 0; }
.bk-detail-cols { display: grid; gap: 3rem; }
@media (min-width: 56rem) { .bk-detail-cols { grid-template-columns: 7fr 5fr; gap: clamp(3rem, 7vw, 7rem); align-items: start; } }
.bk-detail-cols > :only-child { grid-column: 1 / -1; }
.bk-fieldnote { position: relative; padding: 1.75rem 1.75rem 1.25rem; background: var(--paper-2); border-left: 2px solid var(--brass-deep); }
.bk-fieldnote p:not(.kicker) { font: 400 clamp(1.15rem, 1.05rem + .4vw, 1.35rem)/1.5 var(--serif); }
.bk-content { max-width: var(--narrow); }

/* Fiche technique façon carnet de terrain */
.bk-spec { font-family: var(--mono); border: 1px solid var(--line-light); border-top: 3px solid var(--ink);
  padding: 1.5rem 1.5rem .75rem; background: var(--paper); }
.bk-spec-title { font: 500 .75rem/1.2 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--brass-deep);
  margin: 0 0 1rem; padding-bottom: .9rem; border-bottom: 1px solid var(--ink); }
.bk-spec dl { margin: 0; }
.bk-spec dl > div { display: grid; grid-template-columns: minmax(8.5rem, 2fr) 3fr; gap: .25rem 1rem; padding: .7rem 0; border-bottom: 1px dashed var(--line-light); font-size: .875rem; line-height: 1.5; }
.bk-spec dl > div:last-child { border-bottom: 0; }
.bk-spec dt { color: var(--ink-soft); text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; padding-top: .1rem; }
.bk-spec dd { margin: 0; color: var(--ink); overflow-wrap: anywhere; }
@media (max-width: 24rem) { .bk-spec dl > div { grid-template-columns: 1fr; } }

/* Autres livres */
.bk-others { background: var(--paper-2); padding: clamp(3.5rem, 8vw, 6rem) 0; }
.bk-others-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 1rem 2rem; margin-bottom: 2.5rem; }
.bk-others-head h2 { margin: 0; }
.bk-others-head .link-arrow { display: inline-block; padding-block: .6rem .4rem; color: var(--ink); }
.bk-others-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2.5rem clamp(1.25rem, 3vw, 2.5rem); margin: 0; padding: 0; list-style: none; }
@media (min-width: 48rem) { .bk-others-list { grid-template-columns: repeat(4, 1fr); } }
.bk-others-link { display: flex; flex-direction: column; gap: .35rem; color: var(--ink); text-decoration: none; }
.bk-others-link .book-cover { margin-bottom: 1rem; }
.bk-others-title { font: 400 clamp(1.1rem, 1rem + .4vw, 1.3rem)/1.2 var(--serif); }
.bk-others-link:hover .bk-others-title { text-decoration: underline; text-decoration-color: var(--brass-deep); text-underline-offset: .18em; }

/* ---------- Animations légères au défilement (facultatives) ---------- */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .bk-card, .bk-others-list li { animation: bk-rise linear both; animation-timeline: view(); animation-range: entry 0% entry 35%; }
    @keyframes bk-rise { from { opacity: .2; transform: translateY(2rem); } to { opacity: 1; transform: none; } }
  }
}
@media (prefers-reduced-motion: reduce) {
  .bk-feature-cover .book-cover, .bk-feature-cover:hover .book-cover { transition: none; }
}

/* ---------- La science derrière la fiction (fiche livre) ---------- */
.bk-science { position: relative; overflow: hidden; background: var(--abyss); padding: clamp(3.5rem, 8vw, 6rem) 0; }
.bk-science::before {
  content: ""; position: absolute; inset: auto -10% -40% auto; width: 60%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(116, 214, 200, .14), transparent); pointer-events: none;
}
.bk-science-head { position: relative; max-width: 40rem; margin-bottom: 2.5rem; }
.bk-science-head h2 { margin: 0 0 .5rem; color: var(--on-dark); }
.bk-science-head .kicker { color: var(--glow); }
.bk-science-intro { margin: 0; color: var(--on-dark-soft); }
.bk-science-list { position: relative; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 14rem), 1fr)); gap: 2rem clamp(1.25rem, 3vw, 2rem); margin: 0; padding: 0; list-style: none; }
.bk-science-link { display: flex; flex-direction: column; gap: .6rem; color: var(--on-dark); text-decoration: none; }
.bk-science-media { display: block; overflow: hidden; border-radius: 4px; aspect-ratio: 4 / 3; background: #111a1c; }
/* Le <picture> doit remplir le cadre 4:3, sinon l'image garde sa hauteur propre et n'en montre que le haut
   (río Tinto sans le chercheur, bande vide sous Ricardo Amils) */
.bk-science-media picture { display: block; height: 100%; }
.bk-science-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease, filter .5s ease; filter: saturate(.85); }
/* Recadrages par fiche liée (mêmes repères que pages.css, qui n'est pas chargé ici) */
.crop-the-dark-world .bk-science-media img { object-position: 50% 88%; }
.crop-red-river-of-mars .bk-science-media img { object-position: 50% 45%; }
.crop-ricardo-amils .bk-science-media img { object-position: 18% 30%; }
.crop-mind-of-terrorist .bk-science-media img { object-position: 0% 40%; }
.crop-white-sharks .bk-science-media img { object-position: 15% 50%; }
.crop-zero-patient .bk-science-media img { object-position: 90% 40%; }
.crop-juan-luis-arsuaga .bk-science-media img { object-position: 50% 18%; }
.crop-virus-del-apocalipsis .bk-science-media img { object-position: 50% 12%; }
.bk-science-sec { color: var(--glow); }
.bk-science-title { font: 400 1.25rem/1.25 var(--serif); }
.bk-science-link:hover .bk-science-media img, .bk-science-link:focus-visible .bk-science-media img { transform: scale(1.04); filter: saturate(1); }
.bk-science-link:hover .bk-science-title { text-decoration: underline; text-decoration-color: var(--glow); text-underline-offset: .2em; }
@media (prefers-reduced-motion: reduce) { .bk-science-media img { transition: none; } }