:root {
  --hub-rule: rgba(183, 146, 67, .45);
  --hub-paper: #f8f4eb;
}

html {
  scroll-behavior: smooth;
}

body.hexagram-hub-page {
  min-width: 0;
  background: var(--color-washi-050);
}

.hexagram-hub-page main {
  display: block;
}

.hexagram-hub-page :where(a, button):focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus-on-light);
  outline-offset: var(--focus-ring-offset);
}

.hexagram-hub-page .brand-footer :where(a, button):focus-visible {
  outline-color: var(--color-focus-on-dark);
}

.hub-breadcrumb {
  padding: 12px max(24px, calc((100% - 1040px) / 2));
  background: var(--hub-paper);
  border-bottom: 1px solid var(--color-border);
}

.hub-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 0;
  padding: 0;
  color: var(--color-ink-600);
  font-size: .75rem;
  list-style: none;
}

.hub-breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 10px;
  color: var(--color-gold-text-on-light);
}

.hub-intro {
  min-height: 268px;
  display: grid;
  place-items: center;
  padding: 64px 24px;
  text-align: center;
  background: linear-gradient(90deg, transparent, rgba(183, 146, 67, .18), transparent) bottom / 100% 1px no-repeat, var(--color-washi-100);
}

.hub-intro > div {
  width: min(720px, 100%);
}

.hub-eyebrow {
  margin: 0 0 10px;
  color: var(--color-gold-text-on-light);
  font: 700 .6875rem/1.6 var(--font-gothic);
  letter-spacing: .18em;
}

.hub-intro h1 {
  margin: 0;
  color: var(--color-ai-900);
  font: 500 clamp(2.25rem, 5vw, 3.25rem)/1.35 var(--font-mincho);
  letter-spacing: .08em;
}

.hub-intro h1::after {
  content: "";
  display: block;
  width: 48px;
  height: 1px;
  margin: 20px auto;
  background: var(--color-gold-decorative);
}

.hub-intro p:last-child {
  margin: 0;
  color: var(--color-ink-600);
  font: 1rem/2 var(--font-gothic);
}

.collection-nav {
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.collection-nav a {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--color-ai-700);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font: 500 1rem/1.5 var(--font-mincho);
  text-decoration: none;
}

.collection-nav a span {
  color: var(--color-ink-600);
  font: .6875rem/1.5 var(--font-gothic);
}

.hub-collection {
  max-width: 1088px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.hub-collection + .hub-collection {
  border-top: 1px solid var(--hub-rule);
}

.collection-heading {
  margin: 0 0 28px;
  display: grid;
  grid-template-columns: max-content 1fr max-content;
  align-items: end;
  gap: 14px;
}

.collection-heading::after {
  content: "";
  grid-column: 2;
  grid-row: 2;
  height: 1px;
  margin-bottom: .45rem;
  background: linear-gradient(90deg, var(--color-gold-decorative), transparent);
}

.collection-heading p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--color-gold-text-on-light);
  font: 700 .625rem/1.5 var(--font-gothic);
  letter-spacing: .16em;
}

.collection-heading h2 {
  grid-column: 1;
  grid-row: 2;
  margin: 0;
  color: var(--color-ai-900);
  font: 500 1.75rem/1.4 var(--font-mincho);
  letter-spacing: .1em;
}

.collection-heading h2 a {
  color: inherit;
  text-decoration: none;
}

.collection-heading > span {
  grid-column: 3;
  grid-row: 2;
  color: var(--color-ink-600);
  font-size: .75rem;
}

.hex-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hex-card {
  min-width: 0;
}

.hex-card > a {
  min-block-size: 116px;
  height: 100%;
  padding: 12px;
  display: grid;
  grid-template-columns: 28px 48px minmax(0, 1fr);
  grid-template-rows: 1fr auto;
  gap: 8px;
  align-items: center;
  color: var(--color-ai-900);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: none;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.hex-card > a:hover {
  border-color: var(--color-gold-decorative);
  background: var(--color-washi-100);
}

.hex-card > a:hover .hex-card__identity strong {
  text-decoration: underline;
}

.hex-card__number {
  align-self: start;
  display: grid;
  justify-items: center;
  color: var(--color-gold-text-on-light);
  font-family: var(--font-mincho);
  line-height: 1;
}

.hex-card__number strong {
  margin: 3px 0;
  font-size: 1.375rem;
  font-weight: 500;
}

.hex-card__number small {
  font-size: .75rem;
}

.hex-card__diagram {
  width: 48px;
  display: grid;
  gap: 5px;
  color: var(--color-ai-700);
}

.hex-line {
  position: relative;
  display: block;
  height: 4px;
}

.hex-line--yang {
  background: currentColor;
}

.hex-line--yin::before,
.hex-line--yin::after {
  content: "";
  position: absolute;
  inset-block: 0;
  width: 42%;
  background: currentColor;
}

.hex-line--yin::before {
  left: 0;
}

.hex-line--yin::after {
  right: 0;
}

.hex-card__identity {
  min-width: 0;
  display: grid;
  align-self: center;
}

.hex-card__identity strong {
  font: 500 1.25rem/1.45 var(--font-mincho);
  letter-spacing: .04em;
}

.hex-card__identity small {
  margin-top: 4px;
  color: var(--color-ink-600);
  font-size: .875rem;
  line-height: 1.5;
}

.hex-card__trigrams {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding-top: 8px;
  color: var(--color-ink-600);
  border-top: 1px solid var(--color-border);
  font-size: .875rem;
  line-height: 1.5;
}

.hex-card__trigrams i {
  width: 1px;
  height: 14px;
  background: var(--hub-rule);
}

.hex-card__trigrams b {
  color: var(--color-ai-700);
  font-weight: 500;
}

@media (min-width: 35em) {
  .hex-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 52.5em) {
  .hex-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 65em) {
  .hex-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 29.999em) {
  .hub-breadcrumb {
    padding-inline: 18px;
  }

  .hub-intro {
    min-height: 0;
    padding: 48px 20px;
    text-align: left;
  }

  .hub-intro h1 {
    font-size: 2rem;
  }

  .hub-intro h1::after {
    margin-inline: 0;
  }

  .hub-intro p:last-child {
    font-size: .9375rem;
    line-height: 1.9;
  }

  .collection-nav {
    padding: 18px;
    gap: 8px;
  }

  .collection-nav a {
    min-height: 64px;
    flex-direction: column;
    gap: 2px;
  }

  .hub-collection {
    padding: 24px 18px 40px;
  }

  .collection-heading {
    margin-bottom: 20px;
  }

}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hex-card > a {
    transition: none;
  }
}

/* Second Pass: editorial guidance and compact, readable HUB03 entries. */
.hexagram-hub-page :is(#hub-index, .hub-collection, .hub-editorial h2) {
  scroll-margin-top: 24px;
}
.hexagram-hub-page .hub-skip-link {
  position: absolute;
  inset-block-start: 8px;
  inset-inline-start: 12px;
  z-index: 1000;
  max-width: calc(100% - 24px);
  padding: 10px 16px;
  color: var(--color-ai-900);
  background: var(--color-surface);
  transform: translateY(-200%);
}
.hexagram-hub-page .hub-skip-link:focus { transform: none; }
.hexagram-hub-page .hub-editorial {
  max-width: 1088px;
  margin-inline: auto;
  padding: 32px 24px;
}
.hexagram-hub-page .hub-editorial__body,
.hexagram-hub-page .hub-collection__intro { max-width: 760px; }
.hexagram-hub-page .hub-editorial h2 {
  margin: 0 0 20px;
  color: var(--color-ai-900);
  font: 500 1.75rem/1.5 var(--font-mincho);
}
.hexagram-hub-page .hub-editorial__body > p,
.hexagram-hub-page .hub-collection__intro p {
  font-size: 1.0625rem;
  line-height: 1.9;
}
.hexagram-hub-page .hub-editorial__body > p + p,
.hexagram-hub-page .hub-collection__intro p + p { margin-top: 12px; }
.hexagram-hub-page .hub-collection__intro { margin-bottom: 24px; }
.hexagram-hub-page .hub-text-links {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}
.hexagram-hub-page .hub-text-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-block: 6px;
}
.hexagram-hub-page .hub-editorial--closing {
  border-top: 1px solid var(--hub-rule);
  padding-bottom: 48px;
}
.hexagram-hub-page .yasuko-guide {
  gap: 16px;
  padding: 16px;
  margin: 24px 0 0;
  border-block: 0;
  border-left: 3px solid var(--color-gold-decorative);
  background: var(--color-surface);
}
.hexagram-hub-page .yasuko-guide[data-display="inline-tip"] { --yasuko-portrait-width: 96px; }
.hexagram-hub-page .yasuko-guide[data-display="closing"] { --yasuko-portrait-width: 64px; }
.hexagram-hub-page .yasuko-guide__name {
  font-size: .875rem;
  letter-spacing: .04em;
}
.hexagram-hub-page .yasuko-guide__message { font-size: 1.0625rem; line-height: 1.9; }
.hexagram-hub-page .hub-cta-intro { margin-top: 24px; }
.hexagram-hub-page .hub-primary-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  margin-top: 16px;
  padding: 12px 32px;
  color: var(--color-surface);
  background: var(--color-ai-900);
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}
.hexagram-hub-page .hub-primary-cta:hover { text-decoration: underline; }
.hexagram-hub-page .hex-card__identity { overflow-wrap: anywhere; }
.hexagram-hub-page .hex-card__trigrams { flex-wrap: wrap; }
@media (min-width: 50em) {
  .hexagram-hub-page :is(#hub-index, .hub-collection, .hub-editorial h2) { scroll-margin-top: 112px; }
}
@media (max-width: 29.999em) {
  .hexagram-hub-page .hub-editorial { padding: 24px 18px; }
  .hexagram-hub-page .hub-editorial--closing { padding-bottom: 40px; }
  .hexagram-hub-page .hub-editorial h2,
  .hexagram-hub-page .collection-heading h2 { font-size: 1.5rem; }
  .hexagram-hub-page .hub-editorial__body > p,
  .hexagram-hub-page .hub-collection__intro p,
  .hexagram-hub-page .yasuko-guide__message { font-size: 1rem; }
  .hexagram-hub-page .yasuko-guide[data-display="inline-tip"] { --yasuko-portrait-width: 64px; }
  .hexagram-hub-page .yasuko-guide[data-display="closing"] { --yasuko-portrait-width: 56px; }
  .hexagram-hub-page .yasuko-guide__body { display: contents; }
  .hexagram-hub-page .yasuko-guide__name { margin: 0; }
  .hexagram-hub-page .yasuko-guide__message { grid-column: 1 / -1; }
  .hexagram-hub-page .hub-primary-cta { width: 100%; }
}