/* ============================================================
   Quantum Arc Press - book landing page
   Loaded only by book.php and es/book.php, after site.css.

   Every colour, radius, shadow and font here comes from the tokens
   site.css already declares. No new palette. If a value looks like a
   one-off it is because the shape is new, never because the brand is.

   Class prefix bk- throughout, so nothing here can collide with the
   shared stylesheet or with a future page.
   ============================================================ */

/* ============ 01. THE RECORD (hero) ============ */
.bk-hero{padding:130px 5vw 40px}
.bk-hero-grid{max-width:var(--maxw);margin:0 auto;display:grid;
  grid-template-columns:320px 1fr;gap:52px;align-items:start}

/* The eyebrow rule in site.css is scoped to .page-head, and this page has no
   .page-head, so the same treatment is restated here rather than reached for. */
.bk-hero .eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.72rem;
  letter-spacing:.24em;text-transform:uppercase;color:var(--arc-cyan);
  border:1px solid rgba(34,211,238,.3);padding:7px 16px;border-radius:999px;
  background:rgba(34,211,238,.06);margin-bottom:20px}
.bk-hero .eyebrow::before{content:'';width:7px;height:7px;border-radius:50%;
  background:var(--arc-cyan);box-shadow:0 0 10px var(--arc-cyan);
  animation:pulse 2.2s ease-in-out infinite}

.bk-cover{position:relative}
.bk-cover-btn{display:block;width:100%;padding:0;border:0;background:none;cursor:zoom-in;
  border-radius:16px;transition:transform .4s cubic-bezier(.2,.9,.3,1.15)}
.bk-cover-btn:hover{transform:translateY(-6px)}
.bk-cover-btn:focus-visible{outline:2px solid var(--arc-cyan);outline-offset:8px;border-radius:16px}
.bk-cover-btn img{width:100%;height:auto;aspect-ratio:2/3;object-fit:cover;border-radius:16px;
  background:var(--bg-1);box-shadow:0 34px 70px -18px rgba(124,58,237,.5),
  0 18px 40px -16px rgba(34,211,238,.32)}

.bk-series{font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--text-mid);margin-bottom:10px}
.bk-hero-meta h1{font-family:var(--font-display);font-weight:700;line-height:1.08;
  font-size:clamp(2rem,4.2vw,3.2rem)}
.bk-gloss{color:var(--text-mid);font-size:1.05rem;font-style:italic;line-height:1.35;margin-top:8px}
.bk-gloss.sm{font-size:.84rem;margin-top:4px}
.bk-author-line{color:var(--gold);font-size:.95rem;letter-spacing:.02em;margin-top:12px}
.bk-tags{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0 20px}
.bk-hook{font-family:var(--font-display);font-size:clamp(1.15rem,1.9vw,1.45rem);
  line-height:1.45;max-width:44ch}
.bk-desc{color:var(--text-mid);line-height:1.75;margin-top:16px;max-width:62ch}

/* ============ BUY ROWS ============ */
.bk-fmts{display:flex;flex-direction:column;gap:10px;margin-top:26px;max-width:460px}
.bk-fmt{display:flex;align-items:center;gap:10px}
.bk-fmt-l{flex:1;font-size:.88rem;font-weight:500;color:var(--text-hi)}
.bk-soon{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:26px}
.bk-soon .badge{padding:9px 16px;font-size:.66rem}

/* ============ SECTION FURNITURE ============ */
.bk-sec{padding:56px 5vw}
.bk-h2{font-family:var(--font-display);font-weight:700;
  font-size:clamp(1.5rem,2.6vw,2.1rem);margin-bottom:26px}
.bk-sec .bk-h2:not(:first-child){margin-top:52px}
.bk-prose p{color:var(--text-mid);line-height:1.85;margin-bottom:20px;max-width:72ch}
.bk-prose p:last-child{margin-bottom:0}

/* ============ 02. EDITIONS ============ */
.bk-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:28px}
.bk-tab{padding:9px 20px;border-radius:999px;font-size:.84rem;font-weight:500;
  font-family:inherit;cursor:pointer;color:var(--text-mid);
  border:1px solid var(--border-glass);background:var(--surface);
  transition:color .25s,border-color .25s,background .25s}
.bk-tab:hover{color:var(--text-hi);border-color:rgba(34,211,238,.4)}
.bk-tab[aria-selected="true"]{color:#fff;border-color:transparent;background:var(--arc-gradient);
  box-shadow:0 6px 20px -8px rgba(124,58,237,.6)}
.bk-ed-blurb{color:var(--text-mid);line-height:1.75;margin-bottom:24px;max-width:68ch}
.bk-ed-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.bk-ed-card{display:grid;grid-template-columns:96px 1fr;gap:20px;padding:22px;
  border-radius:18px;background:var(--surface);border:1px solid var(--border-glass);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:border-color .3s,box-shadow .3s}
.bk-ed-card:hover{border-color:rgba(34,211,238,.35);
  box-shadow:0 20px 44px -20px rgba(59,130,246,.4)}
.bk-ed-cover{width:96px;aspect-ratio:2/3;object-fit:cover;border-radius:10px;
  background:var(--bg-1);box-shadow:0 14px 30px -12px rgba(0,0,0,.75)}
.bk-ed-body h3{font-family:var(--font-display);font-size:1.05rem;line-height:1.25}
.bk-ed-body .bk-fmts{margin-top:16px}

/* ============ 03. ARCHIVE RECORD ============ */
.bk-rec{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:2px 34px;padding:30px}
.bk-rec-row{display:flex;justify-content:space-between;gap:18px;padding:13px 0;
  border-bottom:1px solid var(--border-glass)}
.bk-rec dt{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--text-mid)}
.bk-rec dd{font-size:.9rem;color:var(--text-hi);text-align:right}
.bk-rec:hover{transform:none;box-shadow:none}

/* ============ 05. WHO IT IS FOR / WHAT IS INSIDE ============ */
.bk-ticks{list-style:none;display:grid;gap:14px;max-width:72ch}
.bk-ticks li{position:relative;padding-left:30px;color:var(--text-mid);line-height:1.7}
.bk-ticks li::before{content:'';position:absolute;left:0;top:.6em;width:9px;height:9px;
  border-radius:50%;background:var(--arc-gradient);box-shadow:0 0 12px rgba(34,211,238,.6)}
.bk-inside{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.bk-inside-item{padding:26px 24px}
.bk-inside-item h3{font-family:var(--font-display);font-size:1.05rem;line-height:1.3;margin-bottom:10px}
.bk-inside-item p{color:var(--text-mid);font-size:.9rem;line-height:1.7}

/* ============ 06. READER RESPONSE ============ */
.bk-quotes{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px}
.bk-quotes blockquote{padding:28px 26px}
.bk-quotes p{font-family:var(--font-display);font-size:1.05rem;line-height:1.6}
.bk-quotes cite{display:block;margin-top:14px;font-style:normal;font-size:.78rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--text-mid)}

/* ============ 07. FROM THE ARCHIVE ============ */
.bk-archive{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:22px}
.bk-ax{display:block;padding:26px 24px;text-decoration:none;color:inherit}
.bk-ax h3{font-family:var(--font-display);font-size:1.02rem;margin-bottom:8px}
.bk-ax p{color:var(--text-mid);font-size:.88rem;line-height:1.65;margin-bottom:14px}
.bk-ax.is-soon{cursor:default}
.bk-ax.is-soon:hover{transform:none;box-shadow:none}

/* ============ 08. THE AUTHOR ============ */
.bk-author{display:grid;grid-template-columns:160px 1fr;gap:30px;align-items:start;padding:30px}
.bk-author:hover{transform:none;box-shadow:none}
.bk-author img{width:160px;height:160px;object-fit:cover;border-radius:18px;
  border:1px solid var(--border-glass)}
.bk-author h3{font-family:var(--font-display);font-size:1.3rem}
.bk-author-role{color:var(--arc-cyan);font-size:.76rem;letter-spacing:.14em;
  text-transform:uppercase;margin:6px 0 14px}
.bk-author p{color:var(--text-mid);line-height:1.75;margin-bottom:18px}

/* ============ 09. MORE LIKE THIS ============ */
.bk-more{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:26px}
.bk-more-card{display:block;text-decoration:none;color:inherit;
  transition:transform .4s cubic-bezier(.2,.9,.3,1.15)}
.bk-more-card:hover{transform:translateY(-8px)}
.bk-more-card:focus-visible{outline:2px solid var(--arc-cyan);outline-offset:6px;border-radius:14px}
.bk-more-card img{width:100%;aspect-ratio:2/3;object-fit:cover;border-radius:14px;
  background:var(--bg-1);box-shadow:0 22px 44px -18px rgba(0,0,0,.8)}
.bk-more-t{display:block;font-family:var(--font-display);font-size:.94rem;
  line-height:1.3;margin-top:14px}
.bk-more-g{display:block;font-size:.76rem;font-style:italic;color:var(--text-mid);margin-top:4px}
.bk-more-card .badge{margin-top:10px}

/* ============ 10. FINAL CALL TO ACTION ============ */
.bk-cta{padding-top:20px}
.bk-cta-grid{display:grid;grid-template-columns:200px 1fr;gap:40px;align-items:center;
  padding:40px;border-radius:24px;background:var(--surface);
  border:1px solid var(--border-glass);backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px)}
.bk-cta-grid img{width:200px;aspect-ratio:2/3;object-fit:cover;border-radius:14px;
  box-shadow:0 26px 54px -16px rgba(0,0,0,.8)}
.bk-cta-grid h2{font-family:var(--font-display);font-size:clamp(1.4rem,2.4vw,2rem);line-height:1.15}
.bk-note{font-size:.76rem;color:var(--text-mid);opacity:.8;margin-top:20px;max-width:60ch}

/* ============ 11. RETURN ============ */
.bk-return{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;
  padding-top:20px;padding-bottom:80px}

/* ============ COVER LIGHTBOX ============ */
.bk-light{position:fixed;inset:0;z-index:100;display:grid;place-content:center;padding:5vh 5vw;
  width:100%;height:100%;max-width:100%;max-height:100%;border:0;
  background:rgba(4,5,13,.9);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.bk-light:not([open]){display:none}
.bk-light::backdrop{background:transparent}
body:has(.bk-light[open]){overflow:hidden}
.bk-light img{max-height:90vh;width:auto;border-radius:16px;
  box-shadow:0 40px 90px -20px rgba(0,0,0,.9)}
.bk-light-x{position:absolute;top:20px;right:22px;width:42px;height:42px;border-radius:50%;
  font-size:1.5rem;line-height:1;cursor:pointer;color:var(--text-hi);
  background:rgba(255,255,255,.06);border:1px solid var(--border-glass)}
.bk-light-x:hover{background:rgba(255,255,255,.14)}

/* ============ RESPONSIVE ============ */
@media(max-width:900px){
  .bk-hero{padding-top:120px}
  .bk-hero-grid{grid-template-columns:1fr;gap:34px}
  .bk-cover{max-width:260px}
  .bk-author{grid-template-columns:1fr;gap:22px}
  .bk-author img{width:130px;height:130px}
  .bk-cta-grid{grid-template-columns:1fr;gap:26px;padding:30px;text-align:center}
  .bk-cta-grid img{width:160px;margin:0 auto}
  .bk-cta-grid .bk-fmts{margin-inline:auto}
  .bk-cta-grid .bk-note{margin-inline:auto}
}
@media(max-width:560px){
  .bk-sec{padding:44px 5vw}
  .bk-ed-card{grid-template-columns:76px 1fr;gap:16px;padding:18px}
  .bk-ed-cover{width:76px}
  .bk-rec-row{flex-direction:column;gap:4px}
  .bk-rec dd{text-align:left}
  .bk-return .btn{width:100%;text-align:center}
}
@media(prefers-reduced-motion:reduce){
  .bk-cover-btn,.bk-more-card{transition:none}
  .bk-cover-btn:hover,.bk-more-card:hover{transform:none}
}