/* ─────────────────────────────────────────────────────────
   book.css — page-specific styles for /book.html
   Distinctive element: a two-page spread for the chapter preview.
   ───────────────────────────────────────────────────────── */

.page-book { background: var(--paper); }

/* Hero ───────────────────────────────────────────────────── */
.bk-hero {
  padding-block: clamp(2.5rem, 5vw, 4.5rem) clamp(2rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--rule);
}
.bk-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: center;
}
@media (max-width: 900px) {
  .bk-hero-grid { grid-template-columns: 1fr; }
}

/* Large cover — render the placeholder cover bigger */
.bk-big-card { max-width: 380px; margin: 0 auto; }
.bk-big-cover {
  aspect-ratio: 5 / 7;
  width: 100%;
  padding: clamp(1.5rem, 3vw, 2.2rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 30px 60px -25px oklch(20% 0.02 80 / 0.35),
              0 10px 20px -10px oklch(20% 0.02 80 / 0.18);
}
.bk-big-cover h2 {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(1.6rem, 2.6vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.01em;
  margin: 0;
}
.bk-big-cover .ochre-line { color: oklch(70% 0.10 55); }

/* Large cover image — override the smaller default sizing/shadow */
.bk-big-cover-img {
  max-width: 100%;
  box-shadow:
    0 30px 60px -25px oklch(20% 0.02 80 / 0.35),
    0 10px 20px -10px oklch(20% 0.02 80 / 0.18);
}

/* Title block */
.bk-title {
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  line-height: 1;
  letter-spacing: -0.012em;
  margin: 0.4rem 0 1.4rem;
  max-width: 20ch;
}
.bk-subhead {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.05rem, 1.35vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0 0 2rem;
  max-width: 50ch;
}

.bk-price {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.2rem;
  align-items: center;
  padding: 1.2rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  margin-bottom: 1.6rem;
}
.bk-price-amount {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(2rem, 3.5vw, 2.6rem);
  line-height: 1;
  color: var(--ink);
}
.bk-price-terms {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink-2);
}

.bk-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem 1.8rem;
  margin-bottom: 1.2rem;
}

/* Secondary "or paperback on books.by" link — sits next to the Amazon CTA */
.bk-alt {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-family: var(--sans);
  font-size: 0.92rem;
  color: var(--ink);
  text-decoration: none;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--rule-strong);
  transition: color 0.15s, border-color 0.15s;
}
.bk-alt:hover { color: var(--ochre); border-bottom-color: var(--ochre); }
.bk-alt-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.bk-alt-price {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.15rem;
  letter-spacing: -0.005em;
}
.bk-alt-where { color: var(--ink-2); }
.bk-alt .arrow { font-family: var(--mono); color: var(--ink-2); }
.bk-alt:hover .arrow { color: var(--ochre); }

/* Ghost button for "Read a chapter free" — kept visually prominent
   without competing with the priced CTAs above it */
.bk-btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.85rem 1.4rem;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  background: transparent;
  border: 1px dashed var(--ochre);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  margin-bottom: 1.4rem;
}
.bk-btn-ghost:hover {
  background: var(--ochre);
  color: var(--ink);
  border-style: solid;
  border-color: var(--ochre);
}
.bk-ghost-mark {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--ochre);
  transition: color 0.15s;
}
.bk-btn-ghost:hover .bk-ghost-mark { color: var(--ink); }
.bk-btn {
  background: var(--ink);
  color: var(--paper);
  padding: 1rem 1.5rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  border: 1px solid var(--ink);
  transition: background 0.15s, border-color 0.15s;
}
.bk-btn:hover { background: var(--ochre); border-color: var(--ochre); }
.bk-btn .arrow { font-family: var(--mono); }

.bk-btn-lg {
  background: var(--ink);
  color: var(--paper);
  padding: 1.2rem 1.8rem;
  font-family: var(--sans);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  border: 1px solid var(--ink);
  transition: background 0.15s;
}
.bk-btn-lg:hover { background: var(--ochre); border-color: var(--ochre); }

.bk-secondary {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--ochre);
  padding-bottom: 2px;
  text-decoration: none;
}
.bk-secondary:hover { color: var(--ochre); }

.bk-resellers {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  margin: 0;
}
.bk-resellers a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px dotted var(--rule-strong);
}
.bk-resellers a:hover { color: var(--ochre); border-bottom-color: var(--ochre); }

/* Specs strip on the book hero */
.bk-specs {
  grid-template-columns: repeat(4, 1fr);
}

/* Section scaffolding ────────────────────────────────────── */
.bk-section {
  padding-block: clamp(4rem, 7vw, 6.5rem);
  border-bottom: 1px solid var(--rule);
}
.bk-section-tint { background: var(--paper-2); }

/* About ──────────────────────────────────────────────────── */
.bk-about {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: 2rem;
  align-items: start;
}
@media (max-width: 800px) {
  .bk-about { grid-template-columns: 1fr; }
}
.bk-about-prose p {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 1.2rem;
  max-width: 56ch;
}
.bk-about-prose .lede {
  font-size: 1.3rem;
  color: var(--ink);
}
.bk-about-meta {
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  padding: clamp(1.4rem, 2.5vw, 2rem);
}
.bk-about-meta .caps {
  display: block;
  font-family: var(--mono);
  font-size: var(--tiny);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 0.5rem;
  border-top: 1px solid var(--ink);
  margin-bottom: 1rem;
}
.bk-about-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.bk-about-list li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 0.7rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.85rem;
  align-items: baseline;
}
.bk-about-list li:last-child { border-bottom: 0; }
.bk-about-list .k {
  font-family: var(--mono);
  font-size: var(--tiny);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.bk-about-list .v {
  font-family: var(--sans);
  color: var(--ink);
  line-height: 1.4;
}

/* TOC ────────────────────────────────────────────────────── */
.bk-toc {
  list-style: none;
  padding: 0;
  margin: 2.5rem 0 0;
  border-top: 1px solid var(--ink);
}
.bk-toc-item {
  display: grid;
  grid-template-columns: 60px 1fr 80px;
  gap: 1.2rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
  transition: background 0.15s;
}
.bk-toc-item:hover {
  background: var(--paper);
  margin-inline: -1rem;
  padding-inline: 1rem;
}
.bk-toc-num {
  font-family: var(--mono);
  font-size: var(--tiny);
  letter-spacing: 0.16em;
  color: var(--ink-3);
}
.bk-toc-item.is-key .bk-toc-num { color: var(--ochre); }
.bk-toc-body h3 {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.2rem;
  line-height: 1.25;
  letter-spacing: -0.005em;
  margin: 0 0 0.2rem;
  color: var(--ink);
}
.bk-toc-body p {
  font-family: var(--sans);
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
  max-width: 60ch;
}
.bk-toc-tag {
  display: inline-block;
  margin-left: 0.6rem;
  padding: 0.1rem 0.5rem;
  background: var(--ochre);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.bk-toc-page {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  text-align: right;
}

/* Chapter preview — the centerpiece ──────────────────────── */
.bk-preview-section {
  background:
    radial-gradient(circle at 20% 20%, oklch(95% 0.02 80 / 0.5), transparent 60%),
    radial-gradient(circle at 80% 80%, oklch(94% 0.015 70 / 0.4), transparent 55%),
    var(--paper);
}

.bk-page-spread {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 980px;
  margin: 2.5rem auto 2.5rem;
  background:
    linear-gradient(to right, oklch(20% 0.015 80 / 0.1) 0%, transparent 4%, transparent 96%, oklch(20% 0.015 80 / 0.1) 100%),
    oklch(97% 0.012 80);
  box-shadow:
    0 60px 90px -50px oklch(20% 0.02 80 / 0.4),
    0 20px 40px -20px oklch(20% 0.02 80 / 0.2);
  position: relative;
}
.bk-page-spread::before,
.bk-page-spread::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 30px;
  pointer-events: none;
}
.bk-page-spread::before {
  left: 50%;
  transform: translateX(-50%);
  background:
    linear-gradient(to right,
      transparent 0%,
      oklch(20% 0.015 80 / 0.18) 50%,
      transparent 100%);
}
@media (max-width: 800px) {
  .bk-page-spread { grid-template-columns: 1fr; }
  .bk-page-spread::before { display: none; }
}

.bk-page {
  padding: clamp(1.5rem, 3vw, 2.5rem) clamp(1.5rem, 3.5vw, 3rem);
  display: flex;
  flex-direction: column;
  min-height: 720px;
  position: relative;
}
.bk-page-left { border-right: 0; }
.bk-page-right { }

.bk-runhead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: oklch(45% 0.01 80);
  padding-bottom: 1.2rem;
  border-bottom: 1px solid oklch(80% 0.01 80);
  margin-bottom: 1.8rem;
}
.bk-runhead span:first-child {
  text-transform: uppercase;
  font-style: italic;
  font-family: var(--display);
  font-weight: 400;
}

.bk-page-body {
  flex: 1;
  font-family: var(--display);
  font-size: 1rem;
  line-height: 1.7;
  color: oklch(22% 0.01 80);
}
.bk-page-body p {
  margin: 0 0 1rem;
  text-align: justify;
  hyphens: auto;
}
.bk-page-body p + p { text-indent: 1.5em; }
.bk-page-body p.bk-first { text-indent: 0; }

.bk-chapter-no {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ochre);
  text-align: center;
  margin-bottom: 0.6rem;
}
.bk-chapter-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: 2.4rem;
  line-height: 1;
  letter-spacing: -0.01em;
  text-align: center;
  color: var(--ink);
  margin: 0 0 0.5rem;
}
.bk-chapter-sub {
  font-family: var(--display);
  font-style: italic;
  font-size: 1rem;
  color: oklch(45% 0.01 80);
  text-align: center;
  margin: 0 0 1.8rem;
}

.bk-dropcap {
  float: left;
  font-family: var(--display);
  font-weight: 500;
  font-size: 4rem;
  line-height: 0.85;
  padding: 0.1em 0.15em 0 0;
  color: var(--ink);
}

.bk-pullout {
  font-family: var(--display);
  font-style: italic;
  font-size: 1.15rem !important;
  line-height: 1.4 !important;
  color: var(--ink) !important;
  text-align: center !important;
  text-indent: 0 !important;
  border-top: 1px solid oklch(75% 0.01 80);
  border-bottom: 1px solid oklch(75% 0.01 80);
  padding: 1rem 0 !important;
  margin: 1.4rem 0 !important;
  max-width: 100%;
}

.bk-work {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: -0.005em;
  margin: 1.6rem 0 0.7rem;
  padding-top: 1rem;
  border-top: 1px solid oklch(75% 0.01 80);
}
.bk-work-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: workitem;
}
.bk-work-list li {
  counter-increment: workitem;
  position: relative;
  padding: 0.4rem 0 0.4rem 1.8rem;
  font-size: 0.95rem;
  line-height: 1.55;
  color: oklch(25% 0.01 80);
}
.bk-work-list li::before {
  content: counter(workitem, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.55rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--ochre);
}

.bk-foot {
  margin-top: auto;
  padding-top: 1.2rem;
  border-top: 1px solid oklch(85% 0.01 80);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: oklch(55% 0.01 80);
  text-align: center;
}

.bk-preview-end {
  text-align: center;
  margin-top: 3rem;
}
.bk-preview-end .caps {
  display: block;
  font-family: var(--mono);
  font-size: var(--tiny);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 1.5rem;
}
.bk-preview-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.5rem 2rem;
}
.bk-preview-cta-alt {
  margin-top: 1.4rem;
  text-align: center;
}

/* Endorsements ───────────────────────────────────────────── */
.bk-endorsements {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 2.5rem;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
@media (max-width: 900px) {
  .bk-endorsements { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .bk-endorsements { grid-template-columns: 1fr; }
}
.bk-endorse {
  margin: 0;
  padding: clamp(1.6rem, 2.5vw, 2.2rem);
  border-right: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}
.bk-endorse:nth-child(3n) { border-right: 0; }
.bk-endorse-feature {
  grid-column: 1 / -1;
  border-right: 0;
  padding: clamp(2.5rem, 4vw, 3.5rem);
  background: var(--paper);
  text-align: center;
}
.bk-endorse-feature footer { align-items: center; }
.bk-endorse-feature p {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1.25;
  color: var(--ink);
  margin: 0 0 1.4rem;
  max-width: 30ch;
  margin-inline: auto;
  font-style: italic;
}
.bk-endorse:not(.bk-endorse-feature) p {
  font-family: var(--display);
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ink);
  margin: 0 0 1.2rem;
  font-style: italic;
  text-wrap: pretty;
}
.bk-endorse footer {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-family: var(--mono);
  font-size: var(--tiny);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.bk-endorse footer strong {
  color: var(--ink);
  font-weight: 500;
}

/* Author ─────────────────────────────────────────────────── */
.bk-author {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: 2rem;
  align-items: start;
}
@media (max-width: 800px) {
  .bk-author { grid-template-columns: 1fr; }
}
.bk-author-portrait .frame { max-width: 360px; }
.bk-author-portrait .frame .img-placeholder { aspect-ratio: 4 / 5; }
.bk-author-prose p {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 1.2rem;
  max-width: 54ch;
}
.bk-author-prose .lede {
  font-size: 1.2rem;
  color: var(--ink);
}
.bk-author-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 2rem;
  margin-top: 1.6rem;
}

/* Buy again ──────────────────────────────────────────────── */
.bk-buyagain {
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(3.5rem, 6vw, 5.5rem);
}
.bk-buyagain-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
@media (max-width: 800px) {
  .bk-buyagain-inner { grid-template-columns: 1fr; }
}
.bk-buyagain .caps {
  font-family: var(--mono);
  font-size: var(--tiny);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ochre);
  display: block;
  margin-bottom: 1rem;
}
.bk-buyagain h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.012em;
  color: var(--paper);
  margin: 0 0 1.2rem;
  max-width: 26ch;
}
.bk-buyagain p {
  font-family: var(--display);
  font-size: 1.05rem;
  line-height: 1.55;
  color: oklch(80% 0.005 80);
  margin: 0;
  max-width: 48ch;
}
.bk-buyagain-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
}
.bk-buyagain-cta .bk-btn-lg {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}
.bk-buyagain-cta .bk-btn-lg:hover {
  background: var(--ochre);
  border-color: var(--ochre);
}
.bk-buyagain-cta .bk-secondary {
  color: var(--paper);
}
.bk-buyagain-cta .bk-secondary:hover { color: var(--ochre); }