/* ============================================================
   BookVerse Publications — design tokens
   Palette: paper cream, deep indigo, marigold accent,
   forest + rosewood + slate as subject-tab colours.
   Display: Fraunces (serif) · Body: Inter · Utility: IBM Plex Mono
   ============================================================ */

:root {
  --paper: #FAF6EC;
  --paper-dim: #F1EAD9;
  --ink: #211F2B;
  --ink-soft: #5B5768;
  --indigo: #1E2A4D;
  --indigo-deep: #141C36;
  --marigold: #E7A339;
  --marigold-deep: #C4832A;
  --forest: #2F6B4F;
  --rosewood: #A8483A;
  --slate: #4E5E78;

  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 12px 30px -14px rgba(20, 20, 40, 0.35);

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--indigo);
  margin: 0 0 .4em;
  letter-spacing: -0.01em;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--marigold-deep);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn-primary { background: var(--marigold); color: var(--indigo-deep); }
.btn-primary:hover { background: var(--marigold-deep); transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--paper); border-color: rgba(250,246,236,.5); }
.btn-outline:hover { background: rgba(250,246,236,.12); }
.btn-ghost { background: var(--indigo); color: var(--paper); padding: 9px 18px; }
.btn-ghost:hover { background: var(--indigo-deep); }
.btn-dark { background: var(--indigo); color: var(--paper); }
.btn-dark:hover { background: var(--indigo-deep); }
.btn-block { width: 100%; justify-content: center; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header { position: sticky; top: 0; z-index: 40; }
.header-bar { background: var(--indigo); color: var(--paper); }
.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 14px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  background: var(--marigold);
  color: var(--indigo-deep);
  font-family: var(--font-display);
  font-weight: 700;
  border-radius: 8px;
  transform: rotate(-4deg);
}
.brand-text { font-family: var(--font-display); font-size: 1.25rem; color: var(--paper); display: flex; flex-direction: column; line-height: 1; }
.brand-text em { font-style: normal; color: var(--marigold); }
.brand-text small { font-family: var(--font-mono); font-size: .55rem; letter-spacing: .1em; text-transform: uppercase; color: rgba(250,246,236,.55); margin-top: 3px; }

.main-nav { display: flex; gap: 22px; flex: 1; }
.main-nav a { font-weight: 500; font-size: .95rem; color: rgba(250,246,236,.85); }
.main-nav a:hover { color: var(--marigold); }

.header-actions { display: flex; align-items: center; gap: 16px; }
.nav-search { display: flex; align-items: center; background: rgba(250,246,236,.1); border-radius: 999px; padding: 4px 6px 4px 14px; }
.nav-search input { background: transparent; border: none; outline: none; color: var(--paper); font-size: .85rem; width: 190px; }
.nav-search input::placeholder { color: rgba(250,246,236,.5); }
.nav-search button {
  background: var(--marigold);
  border: none;
  border-radius: 999px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  animation: search-blink 1.8s ease-in-out infinite;
}
@keyframes search-blink {
  0%, 100% { box-shadow: 0 0 0 0 rgba(231,163,57,0.7); opacity: 1; }
  50%      { box-shadow: 0 0 0 7px rgba(231,163,57,0); opacity: 0.75; }
}

@media (prefers-reduced-motion: reduce) {
  .nav-search button { animation: none; }
}

.account-link, .hi-user { font-size: .88rem; color: var(--paper); }
.account-menu { display: flex; align-items: center; gap: 12px; font-size: .85rem; }
.account-menu a { color: rgba(250,246,236,.8); }
.account-menu a:hover { color: var(--marigold); }

.cart-link { position: relative; font-weight: 600; background: rgba(250,246,236,.1); padding: 9px 16px; border-radius: 999px; }
.cart-badge { position: absolute; top: -6px; right: -6px; background: var(--rosewood); color: white; font-size: .68rem; padding: 1px 6px; border-radius: 999px; }

/* ---------- flash messages ---------- */
.flash { margin-top: 16px; padding: 12px 18px; border-radius: var(--radius-sm); font-size: .9rem; }
.flash-success { background: #E4F1E8; color: var(--forest); border: 1px solid #bfe0cb; }
.flash-info { background: #EAEEF6; color: var(--slate); border: 1px solid #d3dcec; }
.flash-error, .flash-warning { background: #F7E7E4; color: var(--rosewood); border: 1px solid #eccac3; }

/* ============================================================
   HERO — split layout with fanned "book spine" stack signature
   ============================================================ */
.hero {
  background: linear-gradient(180deg, var(--indigo) 0%, var(--indigo-deep) 100%);
  color: var(--paper);
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 40px;
  align-items: center;
  padding: 72px 24px 60px;
}
.hero-copy .eyebrow { color: var(--marigold); }
.hero h1 { font-size: clamp(2.1rem, 4vw, 3.1rem); color: var(--paper); line-height: 1.08; margin-top: 10px; }
.hero h1 em { font-style: normal; color: var(--marigold); }
.hero p.lede { color: rgba(250,246,236,.78); font-size: 1.05rem; max-width: 46ch; margin: 18px 0 30px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 32px; margin-top: 42px; }
.hero-stats div strong { display: block; font-family: var(--font-display); font-size: 1.6rem; color: var(--marigold); }
.hero-stats div span { font-size: .78rem; color: rgba(250,246,236,.6); }

/* the fanned spine stack */
.spine-stack { position: relative; height: 340px; display: flex; align-items: center; justify-content: center; }
.spine {
  position: absolute;
  width: 148px; height: 210px;
  border-radius: 6px 10px 10px 6px;
  box-shadow: var(--shadow);
  padding: 16px 14px;
  display: flex; flex-direction: column; justify-content: space-between;
  font-family: var(--font-display);
  color: white;
  border-left: 6px solid rgba(0,0,0,.15);
}
.spine .s-label { font-family: var(--font-mono); font-size: .6rem; text-transform: uppercase; letter-spacing: .08em; opacity: .85; }
.spine .s-title { font-size: 1.05rem; line-height: 1.2; }
.spine-1 { background: var(--marigold); color: var(--indigo-deep); }
.spine-2 { background: var(--forest); }
.spine-3 { background: var(--rosewood); }
.spine-4 { background: var(--slate); }

/* ============================================================
   SUBJECT TABS — signature category divider strip
   ============================================================ */
.subject-tabs { background: var(--paper-dim); border-bottom: 1px solid #e6dfcc; }
.tab-indicator {
  position: absolute;
  bottom: 0;
  height: 3px;
  background: var(--marigold);
  left: 0;
  width: 0;
  opacity: 0;
  transition: left .3s ease, width .3s ease, opacity .2s ease, background .3s ease;
}
.subject-tabs .wrap { display: flex; gap: 0; overflow-x: auto; }
.subject-tab {
  flex: 0 0 auto;
  padding: 16px 22px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  border-bottom: 3px solid transparent;
  color: var(--ink-soft);
  white-space: nowrap;
}
.subject-tab:hover { color: var(--ink); }
.subject-tab.active { color: var(--indigo); border-bottom-color: var(--tab-color, var(--marigold)); font-weight: 600; }
.subject-tab .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--tab-color, var(--marigold)); margin-right: 8px; }

/* colour mapping helpers, applied inline via style attr in templates */
.c-indigo { --tab-color: var(--indigo); }
.c-marigold { --tab-color: var(--marigold); }
.c-forest { --tab-color: var(--forest); }
.c-terracotta { --tab-color: var(--rosewood); }
.c-slate { --tab-color: var(--slate); }

/* ============================================================
   SECTIONS
   ============================================================ */
.section { padding: 64px 24px; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 32px; flex-wrap: wrap; gap: 12px; }
.section-head h2 { font-size: 1.9rem; }
.section-head .see-all { font-family: var(--font-mono); font-size: .78rem; text-transform: uppercase; color: var(--indigo); border-bottom: 1px solid var(--indigo); padding-bottom: 2px; }
.section-alt { background: var(--paper-dim); }
.section-dark { background: var(--indigo-deep); color: var(--paper); }
.section-dark h2, .section-dark h3 { color: var(--paper); }

/* ---------- book grid + cards ---------- */
.book-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 26px; }
.book-card { background: white; border-radius: var(--radius); overflow: hidden; box-shadow: 0 6px 18px -10px rgba(20,20,40,.18); transition: transform .18s ease, box-shadow .18s ease; display: flex; flex-direction: column; }
.book-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.book-cover {
  aspect-ratio: 3/4;
  background: linear-gradient(155deg, var(--tab-color, var(--indigo)) 0%, color-mix(in srgb, var(--tab-color, var(--indigo)) 70%, black) 100%);
  color: white;
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 16px;
  position: relative;
}
.book-cover .grade-chip { align-self: flex-start; font-family: var(--font-mono); font-size: .65rem; text-transform: uppercase; background: rgba(255,255,255,.18); padding: 4px 9px; border-radius: 999px; }
.book-cover .cover-title { font-family: var(--font-display); font-size: 1.15rem; line-height: 1.15; }
.book-cover .cover-author { font-size: .72rem; opacity: .8; margin-top: 6px; }
.book-cover .discount-flag { position: absolute; top: 12px; right: 12px; background: var(--marigold); color: var(--indigo-deep); font-size: .68rem; font-weight: 700; padding: 4px 8px; border-radius: 6px; }

.book-info { padding: 16px 16px 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.book-info .subject-label { font-family: var(--font-mono); font-size: .68rem; text-transform: uppercase; color: var(--ink-soft); }
.book-info h3 { font-size: 1.02rem; margin: 0; }
.price-row { display: flex; align-items: baseline; gap: 8px; margin-top: auto; }
.price-row .price { font-family: var(--font-mono); font-weight: 600; font-size: 1.05rem; color: var(--indigo); }
.price-row .mrp { font-family: var(--font-mono); font-size: .82rem; text-decoration: line-through; color: var(--ink-soft); }
.stock-note { font-size: .74rem; color: var(--forest); }
.stock-note.out { color: var(--rosewood); }

/* ---------- services / feature cards ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { background: white; border-radius: var(--radius); padding: 28px; border-top: 4px solid var(--tab-color, var(--marigold)); }
.feature-card h3 { font-size: 1.15rem; }
.feature-card p { color: var(--ink-soft); font-size: .93rem; }

/* ---------- testimonials ---------- */
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card { background: rgba(250,246,236,.06); border: 1px solid rgba(250,246,236,.15); border-radius: var(--radius); padding: 26px; }
.testimonial-card .quote-mark { font-family: var(--font-display); font-size: 2.4rem; color: var(--marigold); line-height: 0; display: block; margin-bottom: 10px; }
.testimonial-card p { color: rgba(250,246,236,.85); font-size: .95rem; }
.testimonial-card .who { margin-top: 16px; font-family: var(--font-mono); font-size: .78rem; color: var(--marigold); }
.testimonial-card .who small { display: block; color: rgba(250,246,236,.55); font-family: var(--font-body); margin-top: 2px; }
/* ============================================================
   TESTIMONIAL CAROUSEL
   ============================================================ */
.testimonial-carousel { max-width: 700px; margin: 0 auto; position: relative; }
.testimonial-track { position: relative; min-height: 220px; }
.testimonial-carousel .testimonial-card { display: none; opacity: 0; transition: opacity .5s ease; }
.testimonial-carousel .testimonial-card.active { display: block; opacity: 1; }
.carousel-dots { display: flex; justify-content: center; gap: 10px; margin-top: 24px; }
.carousel-dots .dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(250,246,236,.3); border: none; cursor: pointer; padding: 0; }
.carousel-dots .dot.active { background: var(--marigold); }

/* ============================================================
   CATALOGUE PAGE
   ============================================================ */
.catalogue-layout { display: grid; grid-template-columns: 240px 1fr; gap: 36px; align-items: flex-start; }
.filter-panel { background: white; border-radius: var(--radius); padding: 22px; position: sticky; top: 96px; }
.filter-panel h4 { font-family: var(--font-mono); font-size: .74rem; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 14px; }
.filter-list a { display: flex; align-items: center; gap: 10px; padding: 8px 0; font-size: .92rem; color: var(--ink); }
.filter-list a.active { color: var(--indigo); font-weight: 600; }
.filter-list .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--tab-color); }
.sort-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.sort-bar select { padding: 9px 12px; border-radius: var(--radius-sm); border: 1px solid #ddd4bd; font-family: var(--font-body); background: white; }
.results-count {
  font-weight: 700;
  color: var(--indigo-deep);
  background: var(--marigold);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: .9rem;
  display: inline-block;
}
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 40px; }
.pagination a, .pagination span { padding: 8px 14px; border-radius: var(--radius-sm); background: white; font-family: var(--font-mono); font-size: .82rem; }
.pagination .current { background: var(--indigo); color: var(--paper); }
.empty-state { text-align: center; padding: 60px 20px; color: var(--ink-soft); }

/* ============================================================
   BOOK DETAIL
   ============================================================ */
.book-detail { display: grid; grid-template-columns: 340px 1fr; gap: 48px; padding: 56px 24px; }
.book-detail .book-cover { height: 460px; border-radius: var(--radius); }
.book-detail .book-cover .cover-title { font-size: 1.7rem; }
.detail-info .eyebrow { margin-bottom: 8px; }
.detail-info h1 { font-size: 2.1rem; }
.detail-meta { display: flex; gap: 22px; margin: 18px 0; flex-wrap: wrap; }
.detail-meta div { font-size: .85rem; color: var(--ink-soft); }
.detail-meta strong { display: block; color: var(--ink); font-family: var(--font-mono); }
.detail-price { display: flex; align-items: baseline; gap: 12px; margin: 22px 0; }
.detail-price .price { font-family: var(--font-mono); font-size: 2rem; color: var(--indigo); font-weight: 600; }
.detail-price .mrp { font-family: var(--font-mono); text-decoration: line-through; color: var(--ink-soft); }
.detail-price .save-flag { background: var(--marigold); color: var(--indigo-deep); font-size: .78rem; font-weight: 700; padding: 4px 10px; border-radius: 999px; }
.qty-add-form { display: flex; gap: 12px; align-items: center; margin-bottom: 30px; }
.qty-add-form input[type=number] { width: 70px; padding: 11px; border-radius: var(--radius-sm); border: 1px solid #ddd4bd; text-align: center; }
.related-strip { margin-top: 20px; }

/* ============================================================
   CART / CHECKOUT
   ============================================================ */
.cart-page, .checkout-page { padding: 56px 24px; max-width: 980px; margin: 0 auto; }
.cart-table { width: 100%; border-collapse: collapse; background: white; border-radius: var(--radius); overflow: hidden; }
.cart-table th { text-align: left; font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; color: var(--ink-soft); padding: 14px 18px; border-bottom: 1px solid #eee3cb; }
.cart-table td { padding: 16px 18px; border-bottom: 1px solid #f2ecdd; vertical-align: middle; }
.cart-row-title { display: flex; align-items: center; gap: 14px; }
.cart-row-title .mini-cover { width: 44px; height: 58px; border-radius: 4px; flex-shrink: 0; }
.cart-table input[type=number] { width: 60px; padding: 7px; border-radius: 6px; border: 1px solid #ddd4bd; text-align: center; }
.cart-summary { display: flex; justify-content: flex-end; margin-top: 26px; }
.cart-summary-box { background: white; border-radius: var(--radius); padding: 26px; width: 320px; }
.cart-summary-box .row { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: .93rem; }
.cart-summary-box .total { font-weight: 700; font-family: var(--font-mono); font-size: 1.15rem; border-top: 1px solid #eee3cb; padding-top: 12px; margin-top: 6px; }
.remove-link { font-size: .78rem; color: var(--rosewood); }

.checkout-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; align-items: flex-start; }
.form-card { background: white; border-radius: var(--radius); padding: 28px; }
.form-card .field { margin-bottom: 16px; }
.form-card label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; }
.form-card input, .form-card textarea, .form-card select {
  width: 100%; padding: 11px 13px; border-radius: var(--radius-sm); border: 1px solid #ddd4bd; font-family: var(--font-body); font-size: .93rem;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.order-summary-box { background: white; border-radius: var(--radius); padding: 24px; }
.order-summary-box .line { display: flex; justify-content: space-between; font-size: .88rem; padding: 8px 0; border-bottom: 1px solid #f2ecdd; }

/* ============================================================
   AUTH PAGES
   ============================================================ */
.auth-page { display: flex; justify-content: center; padding: 70px 24px; }
.auth-card { background: white; border-radius: var(--radius); padding: 40px; width: 100%; max-width: 420px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 1.6rem; }
.auth-card .field { margin-bottom: 16px; }
.auth-card label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; }
.auth-card input { width: 100%; padding: 11px 13px; border-radius: var(--radius-sm); border: 1px solid #ddd4bd; }
.auth-switch { text-align: center; margin-top: 18px; font-size: .88rem; color: var(--ink-soft); }
.auth-switch a { color: var(--indigo); font-weight: 600; }
.helptext { font-size: .76rem; color: var(--ink-soft); }
ul.errorlist { color: var(--rosewood); font-size: .8rem; padding-left: 18px; margin: 4px 0; }

/* ============================================================
   ABOUT / CONTACT / MISC
   ============================================================ */
.page-hero { background: var(--indigo); color: var(--paper); padding: 56px 24px; }
.page-hero h1 { color: var(--paper); font-size: 2.2rem; }
.about-body { padding: 56px 24px; max-width: 860px; margin: 0 auto; }
.about-body p { color: var(--ink-soft); margin-bottom: 18px; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 30px 0; }
.value-grid div { background: white; padding: 20px; border-radius: var(--radius); border-top: 4px solid var(--marigold); }

.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; padding: 56px 24px; max-width: 1000px; margin: 0 auto; }
.contact-info div { margin-bottom: 22px; }
.contact-info h4 { font-family: var(--font-mono); font-size: .74rem; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 6px; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { background: var(--indigo-deep); color: rgba(250,246,236,.75); padding: 56px 24px 20px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer-col h4 { color: var(--paper); font-family: var(--font-mono); font-size: .75rem; text-transform: uppercase; margin-bottom: 14px; }
.footer-col a { display: block; margin-bottom: 8px; font-size: .88rem; }
.footer-col a:hover { color: var(--marigold); }
.footer-col p { font-size: .88rem; line-height: 1.6; }
.brand-text.light { flex-direction: row; align-items: center; gap: 8px; margin-bottom: 14px; }
.socials { display: flex; gap: 14px; margin-top: 14px; }
.footer-bottom { border-top: 1px solid rgba(250,246,236,.12); margin-top: 36px; padding-top: 20px; font-size: .8rem; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .spine-stack { height: 220px; margin-top: 20px; }
  .catalogue-layout, .book-detail, .checkout-grid, .contact-layout { grid-template-columns: 1fr; }
  .feature-grid, .testimonial-grid, .value-grid, .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { display: none; }
  .nav-search input { width: 120px; }
}
@media (max-width: 560px) {
  .feature-grid, .testimonial-grid, .value-grid, .footer-grid { grid-template-columns: 1fr; }
  .header-inner { flex-wrap: wrap; }
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* keyboard focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--marigold);
  outline-offset: 2px;
}
/* ============================================================
   BLINKING "VIEW FULL CATALOGUE" HIGHLIGHT
   ============================================================ */
.see-all-blink {
  animation: blink-highlight 1.6s ease-in-out infinite;
  padding: 6px 14px;
  border-radius: 999px;
  border-bottom: none !important;
  background: var(--marigold);
  color: var(--indigo-deep) !important;
  font-weight: 700;
}
@keyframes blink-highlight {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(231,163,57,0.6); }
  50%      { opacity: 0.65; box-shadow: 0 0 0 6px rgba(231,163,57,0); }
}

@media (prefers-reduced-motion: reduce) {
  .see-all-blink { animation: none; }
}
/* ============================================================
   ROTATING BOOK CAROUSEL — each cover cycles through 4 slots
   ============================================================ */
.spine-stack .spine {
  animation: spine-carousel 12s ease-in-out infinite;
}
.spine-stack .spine:nth-of-type(1) { animation-delay: 0s; }
.spine-stack .spine:nth-of-type(2) { animation-delay: -3s; }
.spine-stack .spine:nth-of-type(3) { animation-delay: -6s; }
.spine-stack .spine:nth-of-type(4) { animation-delay: -9s; }

@keyframes spine-carousel {
  0%   { transform: translate(0px, 10px) rotate(-2deg) scale(1.1); z-index: 4; filter: brightness(1); }
  25%  { transform: translate(100px, -15px) rotate(14deg) scale(0.88); z-index: 2; filter: brightness(0.92); }
  50%  { transform: translate(15px, -25px) rotate(-1deg) scale(0.72); z-index: 1; filter: brightness(0.78); }
  75%  { transform: translate(-100px, -10px) rotate(-15deg) scale(0.88); z-index: 2; filter: brightness(0.92); }
  100% { transform: translate(0px, 10px) rotate(-2deg) scale(1.1); z-index: 4; filter: brightness(1); }
}

.spine-stack:hover .spine {
  animation-play-state: paused;
}

@media (prefers-reduced-motion: reduce) {
  .spine-stack .spine { animation: none; }
}
/* ============================================================
   CART BUMP ANIMATION
   ============================================================ */
@keyframes cart-bump {
  0%   { transform: scale(1); }
  30%  { transform: scale(1.25); }
  50%  { transform: scale(0.95); }
  70%  { transform: scale(1.1); }
  100% { transform: scale(1); }
}
.cart-link.bump { animation: cart-bump 0.6s ease; }
/* ============================================================
   PAGE LOADING PROGRESS BAR
   ============================================================ */
#page-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--marigold);
  z-index: 9999;
  transition: width 0.4s ease;
}