:root {
  --booklet-gold: #d4af37;
  --booklet-gold-soft: #f0d56a;
  --booklet-ink: #070707;
  --booklet-charcoal: #171717;
  --booklet-paper: #f4f1e9;
  --booklet-white: #ffffff;
  --booklet-muted: #777168;
  --booklet-line: rgba(116, 95, 31, 0.24);
  --booklet-max: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--booklet-ink);
  background: var(--booklet-paper);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.booklet-header {
  position: sticky;
  z-index: 30;
  top: 0;
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 0 5vw;
  border-bottom: 1px solid rgba(212, 175, 55, 0.28);
  color: #fff;
  background: rgba(8, 8, 8, 0.97);
  backdrop-filter: blur(14px);
}

.booklet-brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: #fff;
  text-decoration: none;
  font-weight: 800;
}

.booklet-brand-mark {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  color: #060606;
  background: var(--booklet-gold);
  font-size: 13px;
}

.booklet-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 24px;
}

.booklet-nav a {
  color: #d9d9d9;
  text-decoration: none;
  font-size: 14px;
}

.booklet-nav a:hover,
.booklet-nav a:focus-visible,
.booklet-nav .is-active {
  color: var(--booklet-gold-soft);
}

.booklet-index-hero,
.booklet-detail-hero {
  color: #fff;
  background:
    radial-gradient(circle at 76% 20%, rgba(212, 175, 55, 0.2), transparent 32%),
    linear-gradient(135deg, #020202 0%, #111 62%, #221d10 100%);
}

.booklet-index-hero-inner,
.booklet-detail-hero-inner,
.booklet-section,
.booklet-footer-inner {
  width: min(90vw, var(--booklet-max));
  margin: 0 auto;
}

.booklet-index-hero-inner,
.booklet-detail-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.72fr);
  gap: clamp(44px, 7vw, 104px);
  align-items: center;
  padding: clamp(72px, 9vw, 132px) 0;
}

.booklet-detail-hero-inner {
  grid-template-columns: minmax(320px, 0.72fr) minmax(0, 1.18fr);
}

.booklet-breadcrumb {
  margin: 0 0 28px;
  color: #c4c4c4;
  font-size: 13px;
}

.booklet-breadcrumb a {
  text-decoration: none;
}

.booklet-kicker {
  margin: 0 0 14px;
  color: var(--booklet-gold);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.booklet-index-hero h1,
.booklet-detail-hero h1,
.booklet-section-heading h2,
.booklet-reading h2,
.booklet-cta h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  line-height: 1.02;
}

.booklet-index-hero h1 {
  max-width: 820px;
  font-size: clamp(3.3rem, 6vw, 6.9rem);
}

.booklet-detail-hero h1 {
  max-width: 820px;
  font-size: clamp(2.7rem, 5vw, 5.8rem);
}

.booklet-lead {
  max-width: 780px;
  margin: 28px 0 0;
  color: #d2d2d2;
  font-size: clamp(1.04rem, 1.7vw, 1.35rem);
}

.booklet-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.booklet-button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--booklet-gold);
  text-decoration: none;
  font-weight: 800;
}

.booklet-button-primary {
  color: #070707;
  background: var(--booklet-gold);
}

.booklet-button-secondary {
  color: #fff;
  background: transparent;
}

.booklet-button-light {
  border-color: #111;
  color: #fff;
  background: #111;
}

.booklet-cover-frame {
  width: min(100%, 440px);
  margin: 0 auto;
  padding: 14px;
  border: 1px solid rgba(212, 175, 55, 0.38);
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.38);
}

.booklet-cover-frame img {
  width: 100%;
}

.booklet-cover-frame figcaption {
  padding: 13px 4px 0;
  color: #aaa;
  font-size: 12px;
}

.booklet-meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.booklet-meta-line span {
  padding: 7px 10px;
  border: 1px solid rgba(212, 175, 55, 0.34);
  color: #e8d78d;
  background: rgba(212, 175, 55, 0.08);
  font-size: 12px;
}

.booklet-author-line {
  margin-top: 28px;
  padding-left: 18px;
  border-left: 2px solid var(--booklet-gold);
  color: #d2d2d2;
}

.booklet-author-line strong,
.booklet-author-line span {
  display: block;
}

.booklet-author-line strong {
  color: #fff;
  font-size: 1.05rem;
}

.booklet-author-line span {
  font-size: 0.92rem;
}

.booklet-section {
  padding: 88px 0;
}

.booklet-section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.72fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 42px;
}

.booklet-section-heading h2 {
  font-size: clamp(2.3rem, 4.2vw, 4.8rem);
}

.booklet-section-heading p:last-child {
  margin: 0;
  color: #625e56;
}

.booklet-featured {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(32px, 5vw, 76px);
  align-items: center;
  padding: clamp(28px, 5vw, 64px);
  border: 1px solid var(--booklet-line);
  background: #fff;
  box-shadow: 0 22px 55px rgba(55, 44, 14, 0.08);
}

.booklet-featured + .booklet-featured {
  margin-top: 24px;
}

.booklet-featured-cover {
  max-width: 340px;
  margin: 0 auto;
  box-shadow: 0 24px 45px rgba(0, 0, 0, 0.22);
}

.booklet-featured h2 {
  margin: 10px 0 20px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.2rem, 3.6vw, 4.2rem);
  font-weight: 400;
  line-height: 1.06;
}

.booklet-featured p {
  color: #565149;
}

.booklet-series-roadmap {
  display: grid;
  grid-template-columns: repeat(12, minmax(54px, 1fr));
  gap: 8px;
  margin-top: 38px;
}

.booklet-series-roadmap span {
  display: grid;
  min-height: 70px;
  place-items: center;
  border: 1px solid var(--booklet-line);
  color: #8a847a;
  background: rgba(255, 255, 255, 0.42);
  font-weight: 800;
}

.booklet-series-roadmap .is-published {
  border-color: var(--booklet-gold);
  color: #080808;
  background: var(--booklet-gold);
}

.booklet-value-grid,
.booklet-summary-grid,
.booklet-related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.booklet-value-card,
.booklet-summary-card,
.booklet-related-card {
  padding: 28px;
  border: 1px solid var(--booklet-line);
  background: rgba(255, 255, 255, 0.65);
}

.booklet-value-card span,
.booklet-summary-card span,
.booklet-related-card span {
  color: #8f7318;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.booklet-value-card h3,
.booklet-summary-card h3,
.booklet-related-card h3 {
  margin: 12px 0 10px;
  font-size: 1.15rem;
}

.booklet-value-card p,
.booklet-summary-card p,
.booklet-related-card p {
  margin: 0;
  color: #625d54;
}

.booklet-summary-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.booklet-reading-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: clamp(34px, 6vw, 82px);
  align-items: start;
}

.booklet-toc {
  position: sticky;
  top: 104px;
  padding: 24px;
  border: 1px solid var(--booklet-line);
  background: rgba(255, 255, 255, 0.72);
}

.booklet-toc strong {
  display: block;
  margin-bottom: 14px;
}

.booklet-toc ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  color: #6c665c;
  font-size: 13px;
}

.booklet-toc a {
  text-decoration: none;
}

.booklet-toc a:hover,
.booklet-toc a:focus-visible {
  color: #8b6d0d;
}

.booklet-reading {
  min-width: 0;
}

.booklet-reading section {
  scroll-margin-top: 110px;
  padding: 0 0 48px;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--booklet-line);
}

.booklet-reading h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 3.2vw, 3.45rem);
}

.booklet-reading h3 {
  margin: 28px 0 8px;
}

.booklet-reading p,
.booklet-reading li {
  color: #36332e;
  font-size: 1.03rem;
}

.booklet-reading ul,
.booklet-reading ol {
  display: grid;
  gap: 8px;
}

.booklet-cost-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.booklet-cost-grid article {
  padding: 20px;
  border-left: 3px solid var(--booklet-gold);
  background: #fff;
}

.booklet-cost-grid h3 {
  margin: 0 0 6px;
}

.booklet-ai-signal-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.booklet-ai-signal {
  padding: 22px;
  border: 1px solid var(--booklet-line);
  background: #fff;
}

.booklet-ai-signal strong {
  display: block;
  margin-bottom: 8px;
  color: var(--booklet-ink);
  font-size: 1.02rem;
}

.booklet-anomaly-chain {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 24px 0;
}

.booklet-anomaly-chain span {
  position: relative;
  padding: 16px 34px 16px 16px;
  border: 1px solid rgba(212, 175, 55, 0.45);
  background: var(--booklet-ink);
  color: #fff;
  font-weight: 700;
}

.booklet-anomaly-chain span::after {
  content: "→";
  position: absolute;
  right: 12px;
  color: var(--booklet-gold);
}

.booklet-anomaly-chain span:last-child::after {
  content: "";
}

.booklet-table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--booklet-line);
}

.booklet-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  background: #fff;
}

.booklet-table th,
.booklet-table td {
  padding: 16px;
  border-bottom: 1px solid #e2ddd1;
  text-align: left;
  vertical-align: top;
}

.booklet-table th {
  color: #0b0b0b;
  background: #e8d575;
  font-size: 13px;
}

.booklet-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 7px;
  margin: 24px 0;
}

.booklet-flow span {
  position: relative;
  padding: 18px 12px;
  text-align: center;
  color: #fff;
  background: #141414;
  font-weight: 800;
}

.booklet-flow span:not(:last-child)::after {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: -8px;
  color: var(--booklet-gold);
  content: "→";
  transform: translateY(-50%);
}

.booklet-model {
  counter-reset: model;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
  padding: 0;
  list-style: none;
}

.booklet-model li {
  counter-increment: model;
  display: grid;
  grid-template-columns: 40px 1fr;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: #fff;
}

.booklet-model li::before {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: #080808;
  background: var(--booklet-gold);
  content: counter(model, decimal-leading-zero);
  font-size: 12px;
  font-weight: 900;
}

.booklet-callout {
  margin: 28px 0;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid rgba(212, 175, 55, 0.46);
  color: #fff;
  background: #111;
}

.booklet-callout strong {
  color: var(--booklet-gold-soft);
}

.booklet-related-card {
  display: block;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.booklet-related-card:hover,
.booklet-related-card:focus-visible {
  border-color: var(--booklet-gold);
  transform: translateY(-3px);
}

.booklet-pdf-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 30px;
  align-items: center;
  padding: clamp(26px, 5vw, 54px);
  color: #fff;
  background: #111;
}

.booklet-pdf-panel h2 {
  margin: 8px 0 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 3.5vw, 3.6rem);
  font-weight: 400;
}

.booklet-pdf-viewer {
  margin-top: 18px;
  border: 1px solid var(--booklet-line);
  background: #fff;
}

.booklet-pdf-viewer summary {
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 800;
}

.booklet-pdf-viewer iframe {
  display: block;
  width: 100%;
  height: min(78vh, 900px);
  border: 0;
  border-top: 1px solid var(--booklet-line);
}

.booklet-author-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: center;
  padding: 32px;
  border: 1px solid var(--booklet-line);
  background: #fff;
}

.booklet-author-monogram {
  display: grid;
  width: 92px;
  height: 92px;
  place-items: center;
  color: #080808;
  background: var(--booklet-gold);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
}

.booklet-author-card h2 {
  margin: 0 0 6px;
  font-size: 1.55rem;
}

.booklet-author-card p {
  margin: 3px 0;
  color: #625d54;
}

.booklet-cta {
  padding: 88px 0;
  text-align: center;
  color: #fff;
  background: #080808;
}

.booklet-cta-inner {
  width: min(88vw, 900px);
  margin: 0 auto;
}

.booklet-cta h2 {
  font-size: clamp(2.4rem, 4.6vw, 5rem);
}

.booklet-cta p {
  color: #c8c8c8;
}

.booklet-footer {
  padding: 34px 0;
  border-top: 1px solid rgba(212, 175, 55, 0.28);
  color: #ddd;
  background: #050505;
}

.booklet-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.booklet-footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
}

.booklet-footer a {
  color: #ddd;
  text-decoration: none;
}

@media (max-width: 980px) {
  .booklet-nav {
    display: none;
  }

  .booklet-index-hero-inner,
  .booklet-detail-hero-inner,
  .booklet-featured,
  .booklet-section-heading,
  .booklet-reading-layout {
    grid-template-columns: 1fr;
  }

  .booklet-detail-hero-inner .booklet-cover-frame {
    grid-row: 2;
  }

  .booklet-toc {
    position: static;
  }

  .booklet-summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .booklet-series-roadmap {
    grid-template-columns: repeat(6, minmax(54px, 1fr));
  }
}

@media (max-width: 680px) {
  .booklet-header {
    min-height: 68px;
    padding: 0 18px;
  }

  .booklet-index-hero-inner,
  .booklet-detail-hero-inner,
  .booklet-section,
  .booklet-footer-inner {
    width: min(92vw, var(--booklet-max));
  }

  .booklet-index-hero-inner,
  .booklet-detail-hero-inner,
  .booklet-section {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .booklet-value-grid,
  .booklet-summary-grid,
  .booklet-related-grid,
  .booklet-cost-grid,
  .booklet-ai-signal-grid,
  .booklet-anomaly-chain,
  .booklet-model,
  .booklet-flow {
    grid-template-columns: 1fr;
  }

  .booklet-anomaly-chain span::after {
    content: "↓";
    right: 16px;
  }

  .booklet-anomaly-chain span:last-child::after {
    content: "";
  }

  .booklet-flow span:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -19px;
    transform: translateX(50%) rotate(90deg);
  }

  .booklet-pdf-panel,
  .booklet-author-card {
    grid-template-columns: 1fr;
  }

  .booklet-pdf-panel .booklet-button {
    width: 100%;
  }

  .booklet-footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .booklet-footer-links {
    justify-content: flex-start;
  }
}