/* /i-ching/ Canonical Learning Page
 * Page-specific layout only. Common tokens, chrome and C06 remain in shared assets.
 */

.i-ching-page {
  min-width: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(183, 146, 67, .07), transparent 24rem),
    var(--color-washi-050);
}

.i-ching-page main,
.i-ching-page .learning-article,
.i-ching-page .learning-section,
.i-ching-page .learning-copy,
.i-ching-page .history-view,
.i-ching-page .learning-path li,
.i-ching-page .learning-path a {
  min-width: 0;
}

.i-ching-page .skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  min-height: 44px;
  padding: 9px 16px;
  color: var(--color-surface);
  background: var(--color-ai-900);
  transform: translateY(-150%);
}

.i-ching-page .skip-link:focus { transform: translateY(0); }

.learning-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 7vw, 88px) 24px clamp(40px, 6vw, 72px);
  border-bottom: 1px solid rgba(183, 146, 67, .34);
  background:
    linear-gradient(135deg, rgba(255, 252, 245, .98), rgba(247, 242, 232, .88)),
    var(--color-washi-100);
}

.learning-hero::before,
.learning-hero::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.learning-hero::before {
  top: 0;
  right: max(-96px, calc((100vw - 1120px) / 2));
  width: min(38vw, 440px);
  aspect-ratio: 1;
  border: 1px solid rgba(183, 146, 67, .19);
  border-radius: 50%;
  transform: translate(18%, -36%);
}

.learning-hero::after {
  right: 0;
  bottom: 0;
  width: min(35vw, 360px);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(169, 74, 53, .55));
}

.learning-measure {
  position: relative;
  z-index: 1;
  max-width: var(--reading-width);
  margin: 0 auto;
}

.learning-eyebrow,
.learning-toc__title {
  color: var(--color-gold-text-on-light);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
}

.learning-eyebrow { margin-bottom: 16px; }

.learning-hero h1 {
  color: var(--color-ai-900);
  font: 600 clamp(2.2rem, 5vw, 3.5rem)/1.35 var(--font-mincho);
  letter-spacing: .04em;
  text-wrap: balance;
}

.learning-hero h1 span {
  display: inline-block;
  margin-top: 8px;
  color: var(--color-ai-700);
  font-size: .48em;
  line-height: 1.65;
  letter-spacing: .06em;
}

.learning-hero__intro {
  margin-top: 28px;
  padding-left: 20px;
  border-left: 3px solid var(--color-shu-600);
  font: 500 17px/2 var(--font-gothic);
}

.learning-hero__intro p + p { margin-top: 12px; }

.learning-hero .yasuko-guide__name a {
  color: inherit;
  text-decoration-thickness: 1px;
}

.learning-toc { margin-top: 32px; }
.learning-toc__title { margin-bottom: 10px; }

.learning-article {
  max-width: 800px;
  margin: 0 auto;
  padding: 16px 24px 96px;
}

.learning-section {
  padding-block: clamp(56px, 8vw, 88px);
  border-bottom: 1px solid rgba(224, 216, 204, .9);
}

.learning-section:last-of-type { border-bottom: 0; }

.learning-section > .section-kicker {
  margin-bottom: 12px;
  color: var(--color-gold-text-on-light);
}

.learning-section > h2,
.reference-section h2 {
  color: var(--color-ai-900);
  font: 600 clamp(1.75rem, 4vw, 2.35rem)/1.5 var(--font-mincho);
  letter-spacing: .04em;
  text-wrap: balance;
}

.learning-section > h2::after {
  display: block;
  width: 48px;
  height: 2px;
  margin-top: 16px;
  background: var(--color-shu-600);
  content: "";
}

.learning-section h3 {
  margin-top: 40px;
  color: var(--color-ai-700);
  font: 600 1.2rem/1.65 var(--font-mincho);
  letter-spacing: .035em;
}

.learning-section h2 + h3 { margin-top: 32px; }

.learning-section > p,
.learning-copy,
.whole-position p,
.history-view p,
.three-meanings p {
  margin-top: 18px;
}

.learning-copy p + p,
.learning-section > p + p,
.whole-position p + p,
.history-view p + p,
.reference-section p + p {
  margin-top: 12px;
}

.standalone-definition {
  color: var(--color-ink-900);
  font-weight: 600;
}

.section-link {
  color: var(--color-ink-600);
  font-size: .94rem;
}

.definition-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.definition-list--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.definition-list > div {
  padding: 22px 20px;
  border: 1px solid rgba(183, 146, 67, .4);
  border-top: 3px solid var(--color-ai-700);
  background: rgba(255, 252, 245, .7);
}

.definition-list dt {
  color: var(--color-ai-900);
  font: 600 1.2rem/1.5 var(--font-mincho);
}

.definition-list dd {
  margin-top: 10px;
  color: var(--color-ink-600);
  font-size: .92rem;
  line-height: 1.85;
}

.line-definitions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.line-definitions > div {
  padding: 24px;
  border-block: 1px solid rgba(183, 146, 67, .44);
  background: rgba(255, 252, 245, .62);
}

.line-definitions dt {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 2px 16px;
  color: var(--color-ai-900);
  font: 600 1.15rem/1.5 var(--font-mincho);
}

.line-definitions dt small {
  grid-column: 2;
  color: var(--color-ink-600);
  font: 400 .75rem/1.5 var(--font-gothic);
}

.line-definitions dd {
  margin-top: 12px;
  color: var(--color-ink-600);
}

.yao-symbol {
  grid-row: 1 / 3;
  color: var(--color-shu-600);
  font: 2.7rem/1 sans-serif;
}

.formation-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 14px;
  margin-top: 32px;
  padding: 28px 20px;
  border-block: 1px solid rgba(183, 146, 67, .48);
  list-style: none;
  text-align: center;
}

.formation-flow li { min-width: 0; }

.formation-flow li:nth-child(odd) {
  display: grid;
  gap: 8px;
}

.formation-flow li:nth-child(even) {
  display: flex;
  align-items: center;
  gap: 8px;
}

.formation-flow span:not(.formation-flow__arrow) {
  color: var(--color-ai-900);
  font: 2rem/1 var(--font-mincho);
}

.formation-flow strong {
  color: var(--color-ai-700);
  font: 600 1rem/1.5 var(--font-mincho);
}

.formation-flow small {
  max-width: 7em;
  color: var(--color-ink-600);
  font-size: .75rem;
}

.formation-flow__arrow {
  color: var(--color-shu-600);
  font-weight: 700;
  transform: rotate(-90deg);
}

.whole-position {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  background: rgba(183, 146, 67, .4);
}

.whole-position section {
  min-width: 0;
  padding: 28px 24px;
  background: var(--color-surface);
}

.whole-position h3 { margin-top: 0; }

.whole-position__summary {
  padding: 20px 24px;
  border-left: 3px solid var(--color-shu-600);
  background: var(--color-washi-100);
}

.history-views {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.history-view {
  padding: 28px 24px;
  border: 1px solid var(--color-border);
}

.history-view--tradition {
  border-top: 4px solid var(--color-gold-decorative);
  background: rgba(255, 252, 245, .74);
}

.history-view--research {
  border-top: 4px solid var(--color-ai-700);
  background: rgba(220, 228, 230, .3);
}

.history-view__label {
  margin-top: 0 !important;
  color: var(--color-gold-text-on-light);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
}

.history-view--research .history-view__label { color: var(--color-ai-700); }
.history-view h3 { margin-top: 12px; }

.history-views__note {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(183, 146, 67, .48);
}

.three-meanings {
  margin-top: 48px;
  padding: 28px;
  background: var(--color-washi-100);
}

.three-meanings h3 { margin-top: 0; }

.three-meanings dl {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 20px;
  background: rgba(183, 146, 67, .38);
}

.three-meanings dl > div {
  min-width: 0;
  padding: 18px;
  background: var(--color-surface);
}

.three-meanings dt {
  color: var(--color-ai-900);
  font: 600 1.05rem/1.5 var(--font-mincho);
}

.three-meanings dd {
  margin-top: 6px;
  color: var(--color-ink-600);
  font-size: .88rem;
  line-height: 1.75;
}

.three-meanings__note {
  color: var(--color-ink-600);
  font-size: .9rem;
}

.learning-section--next { padding-bottom: 48px; }
.next-intro { color: var(--color-ink-600); }

.learning-path ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
  list-style: none;
}

.learning-path a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 96px;
  padding: 20px;
  border: 1px solid var(--color-border);
  color: var(--color-ai-900);
  background: rgba(255, 252, 245, .72);
  text-decoration: none;
  transition: border-color var(--duration-fast), background var(--duration-fast);
}

.learning-path a:hover {
  border-color: var(--color-gold-decorative);
  background: var(--color-surface);
}

.learning-path a > span:first-child { display: grid; gap: 4px; min-width: 0; }

.learning-path small {
  color: var(--color-gold-text-on-light);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .14em;
}

.learning-path strong {
  font: 600 1rem/1.6 var(--font-mincho);
}

.learning-path a > span:last-child {
  flex: 0 0 auto;
  color: var(--color-shu-600);
  font-size: 1.2rem;
}

.secondary-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 32px;
  padding: 24px;
  color: var(--color-surface);
  background: var(--color-ai-900);
}

.secondary-cta p { font-size: .92rem; }

.secondary-cta a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex: 0 0 auto;
  min-height: 48px;
  padding: 10px 18px;
  border: 1px solid var(--color-gold-text-on-dark);
  color: var(--color-surface);
  text-decoration: none;
}

.secondary-cta a:hover { color: var(--color-surface); text-decoration: underline; }
.secondary-cta a:focus-visible { outline-color: var(--color-focus-on-dark); }

.learning-closing-guide {
  margin-top: 48px !important;
  margin-bottom: 64px !important;
}

.reference-section {
  padding: 32px;
  border-top: 1px solid rgba(183, 146, 67, .55);
  background: rgba(247, 242, 232, .7);
}

.reference-section h2 { font-size: 1.4rem; }

.reference-section > p,
.reference-section ul {
  margin-top: 16px;
  color: var(--color-ink-600);
  font-size: .86rem;
  line-height: 1.8;
}

.reference-section ul { padding-left: 1.4em; }
.reference-section li + li { margin-top: 8px; }

.reference-section a {
  display: inline;
  min-height: 44px;
  overflow-wrap: anywhere;
}

.reference-section__policy {
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

@media (max-width: 48em) {
  .definition-list--three,
  .history-views,
  .whole-position { grid-template-columns: 1fr; }

  .formation-flow {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .formation-flow li:nth-child(even) {
    justify-content: center;
    flex-direction: column;
    gap: 2px;
  }

  .formation-flow__arrow { transform: none; }
}

@media (max-width: 40em) {
  .learning-hero { padding-inline: 20px; }
  .learning-hero::before { width: 70vw; }
  .learning-hero h1 { font-size: clamp(2rem, 11vw, 2.7rem); }
  .learning-hero h1 span { font-size: .52em; }
  .learning-hero__intro { padding-left: 16px; font-size: 16px; }
  .learning-article { padding-inline: 20px; padding-bottom: 72px; }
  .learning-section { padding-block: 56px; }
  .learning-section h3 { margin-top: 32px; }
  .line-definitions,
  .learning-path ul,
  .three-meanings dl { grid-template-columns: 1fr; }
  .secondary-cta { align-items: stretch; flex-direction: column; }
  .secondary-cta a { width: 100%; }
}

@media (max-width: 22.5em) {
  .learning-hero,
  .learning-article { padding-inline: 16px; }
  .learning-hero h1 { font-size: 1.95rem; }
  .learning-hero h1 span { font-size: .5em; }
  .definition-list > div,
  .line-definitions > div,
  .whole-position section,
  .history-view,
  .three-meanings,
  .reference-section { padding: 20px 16px; }
  .formation-flow { padding-inline: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .i-ching-page *,
  .i-ching-page *::before,
  .i-ching-page *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* Second pass: local diagrams, image-backed C06 and learning choices. */
.i-ching-page .learning-hero { overflow: visible; padding-block: 48px 40px; }
.i-ching-page .learning-hero::before {
  inset: 0; width: auto; height: auto; aspect-ratio: auto;
  border: 0; border-radius: 0; transform: none;
  background: url('/images/assets/bg_washi.png') repeat; opacity: .1;
}
.i-ching-page .learning-section { padding-block: 64px; }
.i-ching-page .yasuko-guide { --yasuko-portrait-width: 56px; align-items: start; }
.i-ching-page .yasuko-guide[data-display="hero"] { --yasuko-portrait-width: 88px; }
.i-ching-page .yasuko-guide__portrait { align-self: start; }
.i-ching-page .yasuko-guide__portrait img { width: 100%; height: auto; object-fit: contain; }
.i-ching-page .yasuko-guide__message,
.i-ching-page .yasuko-guide[data-display="margin-note"] .yasuko-guide__message { font-size: 16px; }
.i-ching-page .learning-closing-guide { margin-block: 28px !important; }
.i-ching-page .learning-line {
  display: block; width: 72px; height: 6px; flex: 0 0 auto;
  color: inherit; background: currentColor; font: inherit;
}
.i-ching-page .learning-line--yin { background: linear-gradient(to right,currentColor 0 calc(50% - 6px),transparent calc(50% - 6px) calc(50% + 6px),currentColor calc(50% + 6px)); }
.i-ching-page .yao-symbol.learning-line { width: 64px; height: 8px; color: var(--color-ai-900); }
.i-ching-page .learning-formation-figure,
.i-ching-page .learning-position-figure { margin: 32px 0; padding: 28px 24px; min-width: 0; }
.i-ching-page .learning-formation-figure { color: var(--color-surface); background: var(--color-ai-900); }
.i-ching-page .learning-figure-title { margin: 0; font: 600 22px/1.7 var(--font-mincho); }
.i-ching-page .learning-formation-figure figcaption,
.i-ching-page .learning-position-figure figcaption { margin-top: 24px; font-size: 14px; line-height: 1.85; }
.i-ching-page .learning-formation-figure figcaption { border-top: 1px solid var(--color-gold-decorative); padding-top: 20px; }
.i-ching-page .formation-flow {
  grid-template-columns: minmax(0,1fr) 64px minmax(0,1fr) 64px minmax(0,1.25fr);
  gap: 10px; padding: 0; margin: 28px 0 0; border: 0; align-items: center;
}
.i-ching-page .formation-flow .formation-stage { display: grid; justify-items: center; gap: 12px; }
.i-ching-page .formation-flow strong { color: var(--color-surface); font: 600 20px/1.7 var(--font-mincho); }
.i-ching-page .formation-flow p { margin: 0; font-size: 16px; line-height: 1.7; }
.i-ching-page .formation-flow span:not(.formation-flow__arrow) { color: inherit; font: inherit; }
.i-ching-page .formation-flow .formation-connection { display: flex; flex-direction: column; gap: 8px; font-size: 16px; line-height: 1.7; color: var(--color-gold-text-on-dark); }
.i-ching-page .formation-flow__arrow { color: inherit; font-size: 24px; }
.i-ching-page .formation-pair { display: grid; gap: 12px; }
.i-ching-page .formation-pair > div { display: flex; align-items: center; gap: 12px; font-size: 16px; line-height: 1.7; }
.i-ching-page .learning-three { display: grid; gap: 7px; }
.i-ching-page .formation-example { font-size: 16px !important; line-height: 1.7 !important; color: var(--color-gold-text-on-dark) !important; }
.i-ching-page .formation-six { display: grid; gap: 14px; }
.i-ching-page .formation-six > div { display: flex; align-items: center; gap: 8px; }
.i-ching-page .formation-group-label { border-left: 1px solid var(--color-gold-text-on-dark); padding-left: 8px; white-space: nowrap; font-size: 16px !important; line-height: 1.7 !important; }
.i-ching-page .learning-position-figure { color: var(--color-ink-900); background: var(--color-washi-100); border-block: 1px solid var(--color-border); }
.i-ching-page .position-diagram { max-width: 320px; width: 100%; margin: 24px auto 0; font-size: 16px; line-height: 1.7; }
.i-ching-page .position-whole-label { margin: 0 0 12px; color: var(--color-ai-900); text-align: center; }
.i-ching-page .position-lines { display: grid; grid-template-columns: 12px minmax(0,1fr) 20px; gap: 16px; }
.i-ching-page .position-lines ol { padding: 0; margin: 0; list-style: none; }
.i-ching-page .position-lines li { display: grid; grid-template-columns: 96px minmax(0,1fr); align-items: center; gap: 16px; min-height: 32px; }
.i-ching-page .position-lines .learning-line { width: 96px; height: 8px; color: var(--color-ai-900); }
.i-ching-page .position-bracket { border: 1px solid var(--color-ai-900); border-right: 0; }
.i-ching-page .position-direction { position: relative; width: 2px; margin: 7px auto; background: var(--color-ai-900); }
.i-ching-page .position-direction::before { content: ''; position: absolute; top: 0; left: -4px; width: 10px; height: 10px; border-top: 2px solid var(--color-ai-900); border-left: 2px solid var(--color-ai-900); transform: rotate(45deg); }
.i-ching-page .position-reading-direction { margin: 16px 0 0; text-align: center; }
.i-ching-page #history { background: var(--color-washi-100); padding-inline: 24px; }
.i-ching-page .learning-path ul { grid-template-columns: 1fr; gap: 0; }
.i-ching-page .learning-path a { border: 0; border-bottom: 1px solid var(--color-border); min-height: 88px; padding: 18px 4px; background: transparent; }
.i-ching-page .learning-path li:first-child a { border-top: 1px solid var(--color-border); }
.i-ching-page .learning-path small { font-size: 14px; line-height: 1.7; letter-spacing: .025em; }
.i-ching-page .learning-path strong { font-size: 18px; }
.i-ching-page .secondary-cta { display: block; padding: 0; color: var(--color-ink-900); background: transparent; }
.i-ching-page .secondary-cta p { font-size: 16px; }
.i-ching-page .secondary-cta a { min-height: 44px; width: auto; justify-content: flex-start; padding: 8px 0; border: 0; color: var(--color-ai-700); text-decoration: underline; text-underline-offset: .2em; }
.i-ching-page .secondary-cta a:focus-visible { outline-color: var(--color-gold-text-on-light); }
@media (max-width: 48em) {
  .i-ching-page .formation-flow { grid-template-columns: 1fr; gap: 24px; }
  .i-ching-page .formation-flow__arrow { transform: none; }
  .i-ching-page .formation-flow .formation-connection { gap: 0; }
  .i-ching-page .learning-formation-figure,
  .i-ching-page .learning-position-figure { padding: 24px 16px; }
}
@media (max-width: 40em) {
  .i-ching-page .learning-hero { padding-block: 32px; }
  .i-ching-page .learning-section { padding-block: 48px; }
  .i-ching-page .yasuko-guide { --yasuko-portrait-width: 48px; }
  .i-ching-page .yasuko-guide[data-display="hero"] { --yasuko-portrait-width: 56px; }
  .i-ching-page #history { padding-inline: 16px; }
}
@media (max-width: 22.5em) {
  .i-ching-page .learning-hero { padding-block: 28px; }
  .i-ching-page .learning-formation-figure,
  .i-ching-page .learning-position-figure { padding-inline: 12px; }
  .i-ching-page .position-lines { gap: 8px; grid-template-columns: 10px minmax(0,1fr) 14px; }
  .i-ching-page .position-lines li { gap: 12px; }
  .i-ching-page .yasuko-guide { grid-template-columns: var(--yasuko-portrait-width) minmax(0,1fr); gap: 12px; }
  .i-ching-page .yasuko-guide__body { display: contents; }
  .i-ching-page .yasuko-guide__name { grid-column: 2; grid-row: 1; align-self: center; }
  .i-ching-page .yasuko-guide__message { grid-column: 1 / -1; }
}