/* ==========================================================================
   PHI OS M3B Knowledge Release
   Library, Book I, preview, protected access, figures and glossary.
   ========================================================================== */

.knowledge-page {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: #f5f3ed;
  color: #11141a;
  font-family: var(--phi-font-body, Inter, Arial, sans-serif);
  line-height: 1.65;
}

.knowledge-page *,
.knowledge-page *::before,
.knowledge-page *::after {
  box-sizing: border-box;
}

.knowledge-shell {
  width: min(1180px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.knowledge-hero {
  padding: clamp(5rem, 11vw, 9rem) 0 clamp(4rem, 8vw, 7rem);
  border-bottom: 1px solid rgba(17, 20, 26, 0.12);
  background:
    radial-gradient(circle at 82% 18%, rgba(184, 145, 75, 0.18), transparent 28rem),
    linear-gradient(155deg, #f7f4eb 0%, #ece9e0 100%);
}

.knowledge-hero__layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: center;
}

.knowledge-eyebrow {
  margin: 0 0 1rem;
  color: #756342;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.knowledge-hero h1,
.knowledge-section h2,
.knowledge-panel h2,
.knowledge-card h2,
.knowledge-card h3 {
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-weight: 450;
  line-height: 1.06;
}

.knowledge-hero h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(3rem, 7.5vw, 6.7rem);
  letter-spacing: -0.045em;
}

.knowledge-hero__lead {
  max-width: 62ch;
  margin: 1.6rem 0 0;
  color: #4f5662;
  font-size: clamp(1rem, 2vw, 1.22rem);
}

.knowledge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.knowledge-action,
.knowledge-link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1.1rem;
  border: 1px solid rgba(17, 20, 26, 0.2);
  border-radius: 999px;
  background: transparent;
  color: #11141a;
  cursor: pointer;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 650;
  text-decoration: none;
}

.knowledge-action--primary {
  border-color: #11141a;
  background: #11141a;
  color: #fff;
}

.knowledge-action:hover,
.knowledge-action:focus-visible,
.knowledge-link-button:hover,
.knowledge-link-button:focus-visible {
  transform: translateY(-1px);
}

.knowledge-book-cover {
  display: block;
  width: min(100%, 420px);
  margin-inline: auto;
  filter: drop-shadow(0 30px 32px rgba(17, 20, 26, 0.22));
}

.knowledge-price-card {
  padding: 2rem;
  border: 1px solid rgba(17, 20, 26, 0.14);
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.55);
}

.knowledge-price-card strong {
  display: block;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-weight: 450;
}

.knowledge-section {
  padding: clamp(4rem, 9vw, 7.5rem) 0;
  border-bottom: 1px solid rgba(17, 20, 26, 0.1);
}

.knowledge-section--ink {
  background: #151920;
  color: #f7f6f1;
}

.knowledge-section--paper {
  background: #fbfaf6;
}

.knowledge-section__heading {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: start;
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.knowledge-section h2,
.knowledge-panel h2 {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 4.5rem);
  letter-spacing: -0.035em;
}

.knowledge-section__copy {
  max-width: 64ch;
  margin: 0;
  color: #515866;
}

.knowledge-section--ink .knowledge-section__copy {
  color: #b5bbc5;
}

.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

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

.knowledge-card {
  position: relative;
  min-width: 0;
  padding: clamp(1.3rem, 3vw, 2rem);
  border: 1px solid rgba(17, 20, 26, 0.13);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.62);
}

.knowledge-card h2,
.knowledge-card h3 {
  margin: 0.75rem 0;
  font-size: clamp(1.45rem, 2.8vw, 2.1rem);
}

.knowledge-card p {
  margin: 0;
  color: #59606b;
}

.knowledge-card a::after {
  position: absolute;
  inset: 0;
  content: "";
}

.knowledge-card__meta,
.knowledge-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.knowledge-chip,
.knowledge-status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0.25rem 0.65rem;
  border: 1px solid rgba(17, 20, 26, 0.14);
  border-radius: 999px;
  background: #f2f0e9;
  color: #4d5561;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.knowledge-status--available {
  background: #e5f2e8;
  color: #285d38;
}

.knowledge-status--preview {
  background: #f7edd8;
  color: #7a5823;
}

.knowledge-status--development,
.knowledge-status--later {
  background: #ececf1;
  color: #626775;
}

.knowledge-controls {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) repeat(2, minmax(180px, 0.35fr));
  gap: 0.9rem;
  margin-bottom: 1rem;
}

.knowledge-field {
  display: grid;
  gap: 0.45rem;
}

.knowledge-field label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.knowledge-field input,
.knowledge-field select {
  width: 100%;
  min-height: 48px;
  padding: 0.7rem 0.85rem;
  border: 1px solid rgba(17, 20, 26, 0.18);
  border-radius: 0.6rem;
  background: #fff;
  color: #11141a;
  font: inherit;
}

.knowledge-results {
  min-height: 1.5rem;
  margin: 0 0 1.5rem;
  color: #69707b;
  font-size: 0.8rem;
}

.knowledge-list {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.knowledge-part {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) minmax(180px, 0.35fr);
  gap: 1.25rem;
  align-items: start;
  padding: 1.4rem 0;
  border-top: 1px solid rgba(17, 20, 26, 0.14);
}

.knowledge-part__number {
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: 2rem;
  color: #817354;
}

.knowledge-part h3 {
  margin: 0;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: 1.55rem;
  font-weight: 450;
}

.knowledge-part p {
  margin: 0.45rem 0 0;
  color: #59606b;
}

.knowledge-boundary {
  padding: 1.25rem 1.4rem;
  border-left: 3px solid #9a7b3f;
  background: #eee9db;
  color: #4e4a40;
  font-size: 0.88rem;
}

.knowledge-review-boundary {
  padding: 2rem;
  border: 1px dashed rgba(17, 20, 26, 0.28);
  border-radius: 1rem;
  color: #59606b;
  text-align: center;
}

.preview-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.32fr) minmax(0, 1fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: start;
}

.preview-toc {
  position: sticky;
  top: 100px;
  padding: 1.2rem;
  border: 1px solid rgba(17, 20, 26, 0.12);
  border-radius: 0.8rem;
  background: #fbfaf6;
}

.preview-toc ol {
  display: grid;
  gap: 0.45rem;
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}

.preview-toc a {
  color: #4d5561;
}

.preview-toc a[aria-current] {
  color: #11141a;
  font-weight: 700;
}

.preview-hero__meta {
  margin-top: 1.5rem;
}

.preview-progress {
  display: grid;
  gap: 0.35rem;
  margin-top: 1.5rem;
  font-size: 0.75rem;
}

.preview-progress progress {
  width: 100%;
}

.preview-resume {
  width: 100%;
  margin-top: 1rem;
}

.preview-source-note {
  margin: 1rem 0 0;
  color: #69707b;
  font-size: 0.72rem;
  line-height: 1.5;
}

.preview-article {
  min-width: 0;
}

.preview-page-controls {
  position: sticky;
  z-index: 4;
  top: 82px;
  display: grid;
  grid-template-columns: minmax(100px, auto) minmax(0, 1fr) minmax(100px, auto);
  gap: 0.75rem;
  align-items: center;
  margin: 0 0 1.25rem;
  padding: 0.75rem;
  border: 1px solid rgba(17, 20, 26, 0.14);
  border-radius: 999px;
  background: rgba(251, 250, 246, 0.94);
  box-shadow: 0 12px 32px rgba(17, 20, 26, 0.08);
  backdrop-filter: blur(14px);
}

.preview-page-controls strong {
  overflow: hidden;
  color: #4f5662;
  font-size: 0.75rem;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-page-controls .knowledge-link-button {
  min-height: 40px;
  padding: 0.5rem 0.85rem;
}

.preview-page-controls button:disabled {
  cursor: not-allowed;
  opacity: 0.4;
  transform: none;
}

.preview-pages {
  display: grid;
  gap: clamp(1.5rem, 5vw, 3.5rem);
}

.preview-page {
  margin: 0;
  scroll-margin-top: 166px;
}

.preview-page img {
  display: block;
  width: min(100%, 760px);
  height: auto;
  margin-inline: auto;
  border: 1px solid rgba(17, 20, 26, 0.12);
  background: #fff;
  box-shadow: 0 18px 60px rgba(17, 20, 26, 0.13);
}

.preview-page figcaption {
  width: min(100%, 760px);
  margin: 0.75rem auto 0;
  color: #69707b;
  font-size: 0.72rem;
  text-align: center;
}

.figure-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.figure-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(17, 20, 26, 0.13);
  border-radius: 1rem;
  background: #fff;
}

.figure-card img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: top center;
  background: #ece9e0;
}

.figure-card__body {
  padding: 1.15rem;
}

.figure-card h3 {
  margin: 0.65rem 0 0.35rem;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: 1.35rem;
  font-weight: 450;
}

.figure-card p {
  margin: 0;
  color: #626975;
  font-size: 0.82rem;
}

.figure-card a::after {
  position: absolute;
  inset: 0;
  content: "";
}

.figure-detail {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.figure-detail img {
  display: block;
  width: 100%;
  border: 1px solid rgba(17, 20, 26, 0.12);
  background: #fff;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.glossary-card {
  padding: 1.35rem;
  border: 1px solid rgba(17, 20, 26, 0.13);
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.64);
}

.glossary-card h2 {
  margin: 0.8rem 0 0.5rem;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: 1.7rem;
  font-weight: 450;
}

.glossary-card__definition {
  margin: 0;
  color: #535a65;
}

.glossary-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.access-panel {
  width: min(760px, calc(100% - 2.5rem));
  margin: clamp(5rem, 12vw, 10rem) auto;
  padding: clamp(2rem, 6vw, 4rem);
  border: 1px solid rgba(17, 20, 26, 0.14);
  border-radius: 1.3rem;
  background: #fbfaf6;
  text-align: center;
}

.access-state {
  display: inline-flex;
  margin: 1rem 0;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: #eee4dd;
  color: #7d4d3a;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.78rem;
}

.checkout-panel {
  width: min(820px, calc(100% - 2.5rem));
  text-align: left;
}

.checkout-product {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  margin: 2rem 0;
  padding: 1.5rem;
  border: 1px solid rgba(17, 20, 26, 0.12);
  border-radius: 1rem;
  background: #fff;
}

.checkout-product h2,
.protected-delivery h2,
.policy-document h2 {
  margin-top: 0;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-weight: 450;
}

.checkout-product strong {
  flex: 0 0 auto;
  color: #755f36;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-weight: 450;
}

.checkout-facts {
  display: grid;
  gap: 0;
  margin: 1.5rem 0;
  border-top: 1px solid rgba(17, 20, 26, 0.12);
}

.checkout-facts > div {
  display: grid;
  grid-template-columns: minmax(8rem, 0.4fr) 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(17, 20, 26, 0.12);
}

.checkout-facts dt {
  color: #686d76;
  font-weight: 600;
}

.checkout-facts dd {
  margin: 0;
}

.checkout-form {
  margin-top: 2rem;
  padding: 1.25rem;
  border-radius: 1rem;
  background: #f2efe7;
}

.checkout-consent {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: flex-start;
  cursor: pointer;
}

.checkout-consent input {
  width: 1.15rem;
  height: 1.15rem;
  margin-top: 0.12rem;
}

.checkout-form button[disabled] {
  cursor: not-allowed;
  opacity: 0.55;
}

.checkout-status {
  min-height: 1.5em;
  margin-top: 1rem;
  color: #5a4c32;
  font-weight: 600;
}

.protected-delivery {
  margin: 2rem 0;
  padding: 1.5rem;
  border: 1px solid rgba(92, 122, 92, 0.32);
  border-radius: 1rem;
  background: #f1f6ef;
  text-align: left;
}

.policy-document {
  width: min(820px, calc(100% - 2.5rem));
}

.policy-document h1 {
  max-width: 18ch;
}

.policy-document h2 {
  margin-top: 2.5rem;
}

.checkout-disclosures {
  margin-top: 1.5rem;
}

.knowledge-empty[hidden] {
  display: none;
}

/* PJA-W1 blueprint-led public articles ---------------------------------- */

.knowledge-articles-hero {
  background:
    radial-gradient(circle at 82% 20%, rgba(86, 96, 166, 0.16), transparent 27rem),
    linear-gradient(145deg, #f8f5ec, #ebe8df);
}

.knowledge-article-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.knowledge-article-card > p {
  flex: 1;
}

.knowledge-article-card__role,
.knowledge-saved-state {
  color: #69707b;
  font-size: 0.72rem;
  font-weight: 650;
}

.knowledge-article-card__footer {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.4rem;
}

.knowledge-articles-boundary {
  margin-top: 2rem;
}

.knowledge-articles-boundary p {
  margin: 0.35rem 0 0;
}

.knowledge-article-shell {
  min-height: 55vh;
}

.knowledge-article-shell[aria-busy="true"] {
  background:
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.46), transparent),
    #f2efe7;
  background-size: 240% 100%;
  animation: knowledge-loading 1.4s ease-in-out infinite;
}

.knowledge-article {
  padding-bottom: clamp(4rem, 9vw, 8rem);
}

.knowledge-article__header {
  padding: clamp(4.5rem, 10vw, 8rem) max(1.25rem, calc((100vw - 960px) / 2));
  background:
    radial-gradient(circle at 78% 28%, rgba(154, 123, 63, 0.16), transparent 23rem),
    #f7f4ec;
}

.knowledge-article__back {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-bottom: 2.5rem;
  color: #555d69;
  text-decoration: none;
}

.knowledge-article__header h1 {
  max-width: 18ch;
  margin: 0;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(3rem, 7vw, 6.3rem);
  font-weight: 450;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.knowledge-article__answer {
  max-width: 48rem;
  margin: 2rem 0 0;
  color: #3f4651;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
  line-height: 1.35;
}

.knowledge-article__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 2.25rem;
}

.knowledge-article__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.32fr);
  gap: clamp(3rem, 8vw, 7rem);
  width: min(960px, calc(100% - 2.5rem));
  margin: clamp(4rem, 9vw, 7rem) auto;
}

.knowledge-article__body {
  min-width: 0;
}

.knowledge-article__body section + section {
  margin-top: 3.5rem;
}

.knowledge-article__body h2 {
  margin: 0 0 1.2rem;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 450;
  letter-spacing: -0.025em;
}

.knowledge-article__body p {
  margin: 0;
  color: #353b45;
  font-size: clamp(1rem, 1.3vw, 1.12rem);
  line-height: 1.85;
}

.knowledge-article__body p + p {
  margin-top: 1.15rem;
}

.knowledge-block {
  margin-block: 1.5rem;
}

.knowledge-block--lead {
  color: #202630 !important;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(1.25rem, 2vw, 1.55rem) !important;
  line-height: 1.55 !important;
}

.knowledge-block--question,
.knowledge-block--insight,
.knowledge-block--next-node {
  padding: clamp(1.25rem, 3vw, 1.8rem);
  border-left: 4px solid #5963a5;
  border-radius: 0 0.9rem 0.9rem 0;
  background: #f2f0e9;
}

.knowledge-block--question p,
.knowledge-block--insight p,
.knowledge-block--next-node p {
  color: #343a45;
}

.knowledge-block__question {
  color: #202630 !important;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(1.25rem, 2vw, 1.55rem) !important;
}

.knowledge-block__answer,
.knowledge-block--next-node .knowledge-connection-link {
  margin-top: 0.85rem;
}

.knowledge-block__label,
.knowledge-block__period {
  color: #646b76 !important;
  font-size: 0.75rem !important;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.knowledge-block--mechanism,
.knowledge-block--timeline,
.knowledge-block--comparison {
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid rgba(17, 20, 26, 0.12);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.62);
}

.knowledge-block--mechanism h3,
.knowledge-block--timeline h3,
.knowledge-block--comparison h3 {
  margin: 0 0 1.25rem;
  color: #202630;
  font-size: clamp(1.25rem, 2vw, 1.65rem);
}

.knowledge-block--mechanism ol,
.knowledge-block--timeline ol {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: knowledge-block-step;
}

.knowledge-block--mechanism li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.8rem;
  counter-increment: knowledge-block-step;
}

.knowledge-block--mechanism li::before {
  grid-row: 1 / span 2;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: #e2e3ef;
  color: #303971;
  content: counter(knowledge-block-step);
  font-size: 0.78rem;
  font-weight: 700;
}

.knowledge-block--mechanism li span {
  color: #555c67;
  line-height: 1.65;
}

.knowledge-block--timeline li {
  display: grid;
  grid-template-columns: minmax(6rem, 0.25fr) minmax(0, 1fr);
  gap: 0.25rem 1rem;
  padding-left: 1rem;
  border-left: 2px solid #c9ccd9;
}

.knowledge-block--timeline li p {
  grid-column: 2;
}

.knowledge-block__comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.knowledge-block__comparison-grid section {
  padding: 1rem;
  border-radius: 0.8rem;
  background: #f2f0e9;
}

.knowledge-block__comparison-grid h4 {
  margin: 0 0 0.8rem;
  color: #202630;
  font-size: 1rem;
}

.knowledge-block__comparison-grid ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding-left: 1.15rem;
  color: #4d5560;
}

.knowledge-block--figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1rem;
}

.knowledge-block--figure figcaption {
  margin-top: 0.75rem;
  color: #686f79;
  font-size: 0.85rem;
  line-height: 1.6;
}

.knowledge-block--transition {
  padding-block: 1.5rem;
  border-block: 1px solid rgba(17, 20, 26, 0.12);
  color: #303971 !important;
  font-weight: 650;
}

.knowledge-article__aside {
  display: grid;
  align-content: start;
  gap: 1rem;
}

.knowledge-article__aside section {
  padding: 1.25rem;
  border: 1px solid rgba(17, 20, 26, 0.12);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.55);
}

.knowledge-article__aside ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding-left: 1.1rem;
  color: #505762;
}

.knowledge-connection-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: #28316f;
  font-weight: 650;
  text-decoration: none;
}

.knowledge-article > .knowledge-boundary,
.knowledge-related,
.knowledge-exit-grid {
  width: min(960px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.knowledge-article > .knowledge-boundary {
  padding: clamp(1.5rem, 4vw, 2.5rem);
}

.knowledge-article > .knowledge-boundary h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.knowledge-article > .knowledge-boundary ul {
  margin: 0;
  padding-left: 1.2rem;
}

.knowledge-related {
  padding-top: clamp(4rem, 8vw, 6rem);
}

.knowledge-related > h2 {
  margin: 0 0 2rem;
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.knowledge-exit-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 3rem;
}

.knowledge-exit-grid .knowledge-connection-link {
  justify-content: center;
  min-height: 58px;
  padding: 0.7rem;
  border: 1px solid rgba(17, 20, 26, 0.14);
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.55);
  text-align: center;
}

.knowledge-empty-state {
  width: min(760px, calc(100% - 2.5rem));
  min-height: 50vh;
  margin: 0 auto;
  padding-block: clamp(5rem, 12vw, 9rem);
}

.knowledge-empty-state h1 {
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 450;
}

@keyframes knowledge-loading {
  from {
    background-position: 120% 0;
  }

  to {
    background-position: -120% 0;
  }
}

@media (max-width: 900px) {
  .knowledge-hero__layout,
  .knowledge-section__heading,
  .preview-layout,
  .figure-detail {
    grid-template-columns: 1fr;
  }

  .knowledge-hero h1 {
    max-width: 16ch;
  }

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

  .knowledge-controls {
    grid-template-columns: 1fr 1fr;
  }

  .knowledge-controls .knowledge-field:first-child {
    grid-column: 1 / -1;
  }

  .preview-toc {
    position: static;
  }

  .preview-page-controls {
    top: 70px;
  }

  .knowledge-article__layout {
    grid-template-columns: 1fr;
  }

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

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

  .knowledge-block__comparison-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .knowledge-shell {
    width: min(100% - 1.5rem, 1180px);
  }

  .knowledge-grid,
  .knowledge-grid--two,
  .figure-grid,
  .glossary-grid,
  .knowledge-controls {
    grid-template-columns: 1fr;
  }

  .knowledge-controls .knowledge-field:first-child {
    grid-column: auto;
  }

  .knowledge-part {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .knowledge-part > :last-child {
    grid-column: 2;
  }

  .preview-page-controls {
    grid-template-columns: auto 1fr auto;
    gap: 0.35rem;
    border-radius: 0.8rem;
  }

  .preview-page-controls .knowledge-link-button {
    min-width: 44px;
    padding-inline: 0.6rem;
    font-size: 0.72rem;
  }

  .preview-page-controls strong {
    font-size: 0.65rem;
  }

  .checkout-product,
  .checkout-facts > div {
    grid-template-columns: 1fr;
  }

  .checkout-product {
    display: grid;
  }

  .knowledge-article__header {
    padding-inline: 1.25rem;
  }

  .knowledge-article__aside,
  .knowledge-exit-grid {
    grid-template-columns: 1fr;
  }

  .knowledge-block--timeline li {
    grid-template-columns: 1fr;
  }

  .knowledge-block--timeline li p {
    grid-column: 1;
  }
}

/* Book I conversion-focused product page */
.knowledge-book-hero {
  padding-top: clamp(3.5rem, 8vw, 6.5rem);
  background:
    radial-gradient(circle at 74% 36%, rgba(191, 145, 51, 0.2), transparent 24rem),
    linear-gradient(145deg, #faf7ee 0%, #eee8dc 100%);
}

.knowledge-book-hero__layout {
  grid-template-columns: minmax(0, 0.92fr) minmax(430px, 1.08fr);
  gap: clamp(2rem, 5vw, 5rem);
}

.knowledge-book-hero__copy {
  position: relative;
  z-index: 2;
}

.knowledge-book-hero__subtitle {
  color: #776039;
  font-weight: 650;
  letter-spacing: 0.04em;
}

.knowledge-book-hero__promise {
  max-width: 42rem;
  margin: 1.5rem 0 0;
  color: #20242b;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.24;
}

.knowledge-book-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.5rem;
}

.knowledge-book-proof span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0.35rem 0.8rem;
  border: 1px solid rgba(117, 99, 66, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
  color: #5d513c;
  font-size: 0.76rem;
  font-weight: 700;
}

.knowledge-book-hero__actions .knowledge-action--primary {
  padding-inline: 1.45rem;
  box-shadow: 0 14px 30px rgba(17, 20, 26, 0.18);
}

.knowledge-book-hero__boundary {
  max-width: 42rem;
  margin: 1rem 0 0;
  color: #717781;
  font-size: 0.75rem;
}

.knowledge-book-visual {
  margin: 0;
  text-align: center;
}

.knowledge-book-cover--expanded {
  width: min(100%, 650px);
  max-height: 690px;
  object-fit: contain;
  filter: drop-shadow(0 38px 38px rgba(17, 20, 26, 0.28));
}

.knowledge-book-visual figcaption {
  margin-top: 0.8rem;
  color: #716a5d;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.knowledge-book-overview-copy {
  display: grid;
  gap: 1.15rem;
}

.knowledge-book-breakdown {
  background: linear-gradient(130deg, #f4ead7, #f9f6ef);
}

.knowledge-book-breakdown__lead {
  border-color: rgba(162, 118, 41, 0.28);
  background: rgba(255, 255, 255, 0.7);
}

.knowledge-book-breakdown__chain {
  display: grid;
  place-items: center;
  min-height: 220px;
  border-color: rgba(184, 145, 75, 0.42);
  background: #161a21;
}

.knowledge-book-breakdown__chain p {
  color: #f4e6c3;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(1.3rem, 2.5vw, 2rem);
  line-height: 1.35;
}

.knowledge-grid--five {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.knowledge-section--ink .knowledge-grid--five .knowledge-card {
  min-height: 150px;
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.07);
}

.knowledge-section--ink .knowledge-grid--five .knowledge-card p {
  color: #c5cad2;
}

.knowledge-book-architecture {
  display: grid;
  gap: 0.9rem;
}

.knowledge-book-part {
  border: 1px solid rgba(17, 20, 26, 0.14);
  border-radius: 1.15rem;
  background: rgba(255, 255, 255, 0.72);
  overflow: clip;
}

.knowledge-book-part summary {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr) 2.5rem;
  gap: 1.1rem;
  align-items: center;
  min-height: 112px;
  padding: 1.3rem 1.5rem;
  cursor: pointer;
  list-style: none;
}

.knowledge-book-part summary::-webkit-details-marker {
  display: none;
}

.knowledge-book-part__number {
  color: #755f36;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: 1.7rem;
}

.knowledge-book-part__heading {
  display: grid;
  gap: 0.35rem;
}

.knowledge-book-part__heading strong {
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  font-weight: 450;
}

.knowledge-book-part__heading small {
  color: #656c77;
  font-size: 0.9rem;
}

.knowledge-book-part__toggle {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border: 1px solid rgba(17, 20, 26, 0.18);
  border-radius: 50%;
  font-size: 1.2rem;
  transition: transform 180ms ease;
}

.knowledge-book-part[open] .knowledge-book-part__toggle {
  transform: rotate(45deg);
}

.knowledge-book-part__body {
  padding: 0 1.5rem 1.6rem 6.6rem;
  border-top: 1px solid rgba(17, 20, 26, 0.08);
}

.knowledge-book-part__summary {
  max-width: 60rem;
  margin: 1.4rem 0 1.5rem;
  color: #4f5662;
  font-size: 1rem;
}

.knowledge-book-part__groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.knowledge-book-part__groups section {
  padding: 1rem;
  border: 1px solid rgba(17, 20, 26, 0.1);
  border-radius: 0.85rem;
  background: #fbfaf6;
}

.knowledge-book-part__groups h3 {
  margin: 0 0 0.7rem;
  color: #655331;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.knowledge-book-part__groups ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.knowledge-book-part__groups li {
  padding: 0.3rem 0.58rem;
  border-radius: 999px;
  background: #efede6;
  color: #525966;
  font-size: 0.72rem;
}

.knowledge-book-final-cta {
  background:
    radial-gradient(circle at 80% 20%, rgba(213, 165, 65, 0.18), transparent 24rem),
    #141820;
  color: #f7f4ec;
}

.knowledge-book-final-cta__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.42fr);
  gap: clamp(2rem, 8vw, 7rem);
  align-items: center;
}

.knowledge-book-final-cta h2 {
  max-width: 15ch;
}

.knowledge-book-final-cta p {
  max-width: 54rem;
  color: #bfc4cd;
}

.knowledge-book-final-cta .knowledge-action:not(.knowledge-action--primary) {
  border-color: rgba(255, 255, 255, 0.32);
  color: #fff;
}

.knowledge-book-final-cta__price {
  display: grid;
  gap: 0.4rem;
  padding: 2rem;
  border: 1px solid rgba(223, 180, 88, 0.42);
  border-radius: 1.2rem;
  background: rgba(255, 255, 255, 0.06);
}

.knowledge-book-final-cta__price span,
.knowledge-book-final-cta__price small {
  color: #c7cbd2;
}

.knowledge-book-final-cta__price strong {
  color: #f0c86c;
  font-family: var(--phi-font-display, Newsreader, Georgia, serif);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 450;
  line-height: 1;
}

@media (max-width: 1050px) {
  .knowledge-book-hero__layout {
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  }

  .knowledge-grid--five {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .knowledge-book-hero__layout,
  .knowledge-book-final-cta__layout {
    grid-template-columns: 1fr;
  }

  .knowledge-book-visual {
    order: -1;
  }

  .knowledge-book-cover--expanded {
    width: min(100%, 520px);
    max-height: 520px;
  }

  .knowledge-grid--five,
  .knowledge-book-part__groups {
    grid-template-columns: 1fr;
  }

  .knowledge-book-part summary {
    grid-template-columns: 2.7rem minmax(0, 1fr) 2.25rem;
    min-height: 96px;
    padding: 1rem;
  }

  .knowledge-book-part__body {
    padding: 0 1rem 1.2rem;
  }
}