/* Renubath Knowledge Hub
   Editorial guides — cool white, Commissioner, quiet structure.
   Not WordPress blog, not magazine cards, not cream luxury. */

.hub-progress {
  position: fixed;
  /* Tuck into the header’s bottom edge — 2px line, no extra sticky chrome */
  top: calc(var(--header) - 2px);
  left: 0;
  right: 0;
  height: 2px;
  z-index: calc(var(--z-header) + 1);
  background: transparent;
  pointer-events: none;
}
.hub-progress__fill {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--ink);
  transition: width 0.08s linear;
}

/* Hub pages: solid bar from load so chrome matches scrolled homepage size
   (transparent header over paper read as a tall empty “header” band). */
.page-hub .site-header {
  background-color: #fff;
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(18, 18, 18, 0.04);
}
.page-hub .site-header.is-scrolled {
  background-color: #fff;
}

/* ——— Hub home (Knowledge Platform) ——— */
.hub-home {
  /* Header clearance + small pad only — sheet bg fills under the fixed bar */
  padding: calc(var(--header) + clamp(0.75rem, 2vw, 1.25rem)) 0 clamp(3rem, 7vw, 5rem);
  background:
    linear-gradient(165deg, var(--paper) 0%, var(--white) 42%, var(--white) 100%),
    radial-gradient(ellipse 80% 50% at 100% 0%, var(--mist) 0%, transparent 55%);
  border-bottom: 1px solid var(--line);
}
.hub-home__intro {
  max-width: 42rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}
.hub-home__intro h1 {
  max-width: 18ch;
  margin-bottom: 1.1rem;
}
.hub-home__lede {
  font-size: 1.08rem;
  max-width: 38rem;
}
.hub-home__layer1 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin: 1.35rem 0 0;
  padding: 0.95rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.hub-home__layer1-label {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
}
.hub-home__layer1-link {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  color: var(--ink);
}
.hub-home__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 1.5rem;
}

/* Intent chips + search */
.kh-intent {
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}
.kh-intent__list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.kh-intent__list li { margin: 0; }
.kh-intent__chip {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--mute);
  font: inherit;
  font-size: 0.92rem;
  letter-spacing: -0.01em;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.kh-intent__chip:hover { border-color: var(--ink); color: var(--ink); opacity: 1; }
.kh-intent__chip.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}
.kh-intent__chip:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}
.kh-search {
  display: block;
  max-width: 28rem;
}
.kh-search input {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  padding: 0.7rem 0.9rem;
  border-radius: 0;
}
.kh-search input::placeholder { color: var(--soft); }
.kh-search input:focus {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}

/* Featured pathways */
.kh-pathways {
  margin-bottom: clamp(2rem, 5vw, 3rem);
}
.kh-pathways h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  margin-bottom: 1.15rem;
}
.kh-pathways__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
@media (min-width: 720px) {
  .kh-pathways__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.kh-pathways__item {
  margin: 0;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 720px) {
  .kh-pathways__item:nth-child(odd) {
    border-right: 1px solid var(--line);
  }
}
.kh-pathways__item a {
  display: block;
  padding: 1.15rem 1rem 1.25rem 0;
  text-decoration: none;
  transition: opacity 0.25s var(--ease);
}
@media (min-width: 720px) {
  .kh-pathways__item:nth-child(even) a {
    padding-left: 1.15rem;
  }
}
.kh-pathways__item a:hover { opacity: 0.7; }
.kh-pathways__title {
  display: block;
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 0.35rem;
}
.kh-pathways__desc {
  display: block;
  color: var(--mute);
  font-size: 0.95rem;
  max-width: 32rem;
}

/* Topic hubs grid */
.kh-hubs {
  margin-bottom: clamp(2.5rem, 6vw, 3.75rem);
}
.kh-hubs h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  margin-bottom: 0.5rem;
}
.kh-hubs__lede {
  max-width: 36rem;
  margin-bottom: 1.5rem;
}
.kh-hubs__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
@media (min-width: 800px) {
  .kh-hubs__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.kh-hub {
  margin: 0;
  border-bottom: 1px solid var(--line);
  padding: 1.25rem 0 1.35rem;
}
@media (min-width: 800px) {
  .kh-hub:nth-child(odd) {
    padding-right: 1.25rem;
    border-right: 1px solid var(--line);
  }
  .kh-hub:nth-child(even) {
    padding-left: 1.25rem;
  }
}
.kh-hub.is-hidden,
.kh-pathways__item.is-hidden,
.kh-index__cluster.is-hidden,
.kh-index__list li.is-hidden {
  display: none;
}
.kh-hub__head {
  display: block;
  text-decoration: none;
  margin-bottom: 0.75rem;
}
.kh-hub__head:hover { opacity: 0.75; }
.kh-hub__eyebrow {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 0.4rem;
}
.kh-hub__title {
  display: block;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 0.4rem;
}
.kh-hub__desc {
  display: block;
  color: var(--mute);
  font-size: 0.95rem;
}
.kh-hub__children {
  list-style: none;
  margin: 0;
  padding: 0.15rem 0 0;
  border-top: 1px solid var(--line);
}
.kh-hub__children li {
  margin: 0;
  border-bottom: 1px solid var(--line);
}
.kh-hub__children li:last-child { border-bottom: 0; }
.kh-hub__children a {
  display: block;
  padding: 0.55rem 0;
  font-size: 0.92rem;
  color: var(--mute);
  text-decoration: none;
}
.kh-hub__children a:hover {
  color: var(--ink);
  opacity: 1;
  text-decoration: underline;
}
.kh-hubs__empty {
  margin-top: 1.25rem;
  color: var(--soft);
}

/* Full guide index by cluster */
.kh-index {
  padding-top: clamp(1.75rem, 4vw, 2.5rem);
  border-top: 1px solid var(--line);
}
.kh-index h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  margin-bottom: 0.5rem;
}
.kh-index__lede {
  max-width: 36rem;
  margin-bottom: 1.75rem;
}
.kh-index__cluster {
  margin-bottom: 1.75rem;
}
.kh-index__cluster-title {
  font-size: 1.05rem;
  margin-bottom: 0.55rem;
  letter-spacing: -0.02em;
}
.kh-index__cluster-title a {
  text-decoration: underline;
  text-underline-offset: 0.16em;
}
.kh-index__solo {
  font-size: 0.92rem;
  color: var(--soft);
  margin: 0;
}
.kh-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 1;
  column-gap: 2rem;
  border-top: 1px solid var(--line);
}
@media (min-width: 700px) {
  .kh-index__list { columns: 2; }
}
.kh-index__list li {
  margin: 0;
  break-inside: avoid;
  border-bottom: 1px solid var(--line);
}
.kh-index__list a {
  display: block;
  padding: 0.55rem 0;
  font-size: 0.92rem;
  color: var(--mute);
  text-decoration: none;
}
.kh-index__list a:hover {
  color: var(--ink);
  opacity: 1;
  text-decoration: underline;
}

/* Legacy list helpers (still used on some blocks) */
.hub-grid {
  display: grid;
  gap: clamp(2.5rem, 5vw, 3.5rem);
}
@media (min-width: 900px) {
  .hub-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

.hub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.hub-list__item {
  margin: 0;
  border-bottom: 1px solid var(--line);
}
.hub-list__item a {
  display: block;
  padding: 1.35rem 0 1.45rem;
  text-decoration: none;
  transition: opacity 0.25s var(--ease);
}
.hub-list__item a:hover { opacity: 0.7; }
.hub-list__type {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 0.45rem;
}
.hub-list__title {
  display: block;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 0.45rem;
}
.hub-list__desc {
  display: block;
  color: var(--mute);
  font-size: 0.98rem;
  max-width: 38rem;
  margin: 0;
}

.hub-side {
  padding: 1.5rem 0 0;
}
@media (min-width: 900px) {
  .hub-side {
    padding: 0 0 0 1.5rem;
    border-left: 1px solid var(--line);
  }
}
.hub-side h2 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
}
.hub-side ul {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
}
.hub-side li {
  margin: 0 0 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
  color: var(--mute);
  font-size: 0.95rem;
}
.hub-side li:last-child { border-bottom: 0; }
.hub-side li strong {
  display: block;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 0.2rem;
}
.hub-side a { text-decoration: underline; }

.hub-upcoming {
  margin-top: clamp(3rem, 7vw, 5rem);
  padding-top: clamp(2rem, 4vw, 2.75rem);
  border-top: 1px solid var(--line);
}
.hub-upcoming h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  margin-bottom: 0.65rem;
}
.hub-upcoming > p {
  max-width: 36rem;
  margin-bottom: 1.75rem;
}
.hub-upcoming__grid {
  display: grid;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
@media (min-width: 700px) {
  .hub-upcoming__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.hub-upcoming__grid li {
  margin: 0;
  padding: 1.15rem 1.25rem;
  background: var(--paper);
  border: 1px solid var(--line);
}
.hub-upcoming__grid strong {
  display: block;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}
.hub-upcoming__tag {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 0.5rem;
}

/* ——— Article layout ——— */
.hub-article {
  /* No top pad here — white body would show as a gap above the gray hero sheet */
  padding: 0;
}
.hub-article__hero {
  /* Clearance lives on the sheet so paper fills flush under the solid header */
  padding: calc(var(--header) + clamp(0.75rem, 2vw, 1.25rem)) 0 clamp(2rem, 5vw, 3rem);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(2rem, 5vw, 3rem);
  background:
    linear-gradient(180deg, var(--paper) 0%, var(--white) 70%);
}
.hub-article__hero .shell { padding-bottom: 0.5rem; }
.hub-article__hero h1 {
  max-width: 18ch;
  margin-bottom: 1rem;
}
.hub-article__lede {
  max-width: 38rem;
  font-size: 1.08rem;
  margin-bottom: 1.75rem;
}

.hub-crumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  margin: 0 0 1rem;
  padding: 0;
  font-size: 0.82rem;
  color: var(--soft);
}
.hub-crumb li { margin: 0; display: inline-flex; align-items: center; gap: 0.5rem; }
.hub-crumb li:not(:last-child)::after {
  content: "/";
  color: var(--line);
}
.hub-crumb a { text-decoration: none; color: var(--mute); }
.hub-crumb a:hover { opacity: 0.65; }
.hub-crumb [aria-current="page"] span { color: var(--ink); }

.hub-layout {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
}
.hub-layout > * {
  /* Prevent wide tables / long strings from expanding the page via min-width:auto */
  min-width: 0;
  max-width: 100%;
}
@media (min-width: 980px) {
  .hub-layout {
    grid-template-columns: minmax(0, 1fr) 15.5rem;
    align-items: start;
  }
}

.hub-prose {
  max-width: 42rem;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.hub-prose > h2 {
  margin-top: 2.75rem;
  scroll-margin-top: calc(var(--header) + 1rem);
}
.hub-prose > h3 {
  margin-top: 1.85rem;
  scroll-margin-top: calc(var(--header) + 1rem);
}
.hub-prose a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}
.hub-prose strong { color: var(--ink); font-weight: 550; }

.hub-summary {
  margin: 0 0 2rem;
  padding: 1.35rem 1.4rem;
  background: var(--paper);
  border-left: 2px solid var(--ink);
}
.hub-summary__title {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 0.85rem;
  font-weight: 600;
}
.hub-summary ul {
  margin: 0;
  padding-left: 1.1rem;
}
.hub-summary li { color: var(--mute); }

.hub-aside {
  position: relative;
}
@media (min-width: 980px) {
  .hub-aside {
    position: sticky;
    top: calc(var(--header) + 1.25rem);
    z-index: var(--z-content, 1);
  }
}

.hub-toc {
  padding: 1.1rem 0 1.35rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.5rem;
}
.hub-toc__title {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft);
  margin: 0 0 0.85rem;
  font-weight: 600;
}
.hub-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
}
.hub-toc li { margin: 0 0 0.55rem; }
.hub-toc a {
  text-decoration: none;
  font-size: 0.88rem;
  color: var(--mute);
  line-height: 1.35;
  display: block;
  border-left: 2px solid transparent;
  padding-left: 0.65rem;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.hub-toc a:hover,
.hub-toc a.is-active {
  color: var(--ink);
  opacity: 1;
  border-left-color: var(--ink);
}

.hub-author {
  margin-top: 0.5rem;
}
.hub-author__name {
  font-size: 1.05rem;
  font-weight: 550;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 0.5rem;
}
.hub-author__note,
.hub-author__meta,
.hub-author__links {
  font-size: 0.9rem;
  color: var(--mute);
  margin: 0 0 0.65rem;
}
.hub-author__links a { text-decoration: underline; }

/* Tables — wide min-width scrolls inside wrap only */
.hub-table-wrap {
  overflow-x: auto;
  max-width: 100%;
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
}
.hub-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 32rem;
}
.hub-table th,
.hub-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.hub-table th {
  background: var(--ink);
  color: #fff;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.hub-table tr:last-child td { border-bottom: 0; }
.hub-table tbody tr:nth-child(even) td { background: var(--paper); }
.hub-table td { color: var(--mute); }
.hub-table td:first-child { color: var(--ink); font-weight: 450; }
.hub-caption {
  font-size: 0.85rem;
  color: var(--soft);
  margin: -1.25rem 0 2rem;
}

.hub-compare {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}
@media (min-width: 640px) {
  .hub-compare { grid-template-columns: 1fr 1fr; }
}
.hub-compare__col {
  padding: 1.25rem 1.3rem;
  border: 1px solid var(--line);
  background: var(--white);
}
.hub-compare__col h3 {
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
}
.hub-compare__col ul { margin-bottom: 0; }

.hub-tips {
  margin: 1.5rem 0 2rem;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.hub-tips li {
  margin: 0;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--mute);
}
.hub-tips strong {
  display: block;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

/* FAQ */
.hub-faq {
  margin-top: 2.75rem;
}
.hub-faq__list { border-top: 1px solid var(--line); }
.hub-faq__item {
  border-bottom: 1px solid var(--line);
  margin: 0;
  padding: 0;
}
.hub-faq__item summary {
  cursor: pointer;
  list-style: none;
  padding: 1.15rem 1.75rem 1.15rem 0;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  position: relative;
}
.hub-faq__item summary::-webkit-details-marker { display: none; }
.hub-faq__item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 1.15rem;
  font-weight: 400;
  color: var(--soft);
}
.hub-faq__item[open] summary::after { content: "–"; }
.hub-faq__answer {
  padding: 0 0 1.25rem;
}
.hub-faq__answer p {
  margin: 0;
  max-width: 38rem;
}

/* Related */
.hub-related {
  margin-top: 2.75rem;
  padding-top: 0.5rem;
}
.hub-related__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.hub-related__list li {
  margin: 0;
  border-bottom: 1px solid var(--line);
}
.hub-related__list a {
  display: block;
  padding: 1.1rem 0;
  text-decoration: none;
}
.hub-related__list a:hover { opacity: 0.7; }
.hub-related__label {
  display: block;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}
.hub-related__note {
  display: block;
  color: var(--mute);
  font-size: 0.92rem;
}

/* CTA */
.hub-cta {
  padding: clamp(2.5rem, 5vw, 3.75rem) 0;
  text-align: center;
}
.hub-cta h2 {
  max-width: 16ch;
  margin-inline: auto;
}
.hub-cta .lead {
  margin-inline: auto;
  max-width: 32rem;
  color: rgba(255, 255, 255, 0.82);
}
.hub-cta .kicker { color: rgba(255, 255, 255, 0.72); }
.hub-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.35rem;
}
/* .sheet--ink a forces white + underline — restore readable CTA buttons */
.hub-cta .btn {
  text-decoration: none;
}
.hub-cta .btn--light {
  background: #fff;
  border-color: #fff;
  color: var(--ink);
}
.hub-cta .btn--light:hover {
  background: transparent;
  color: #fff;
}
.hub-cta__ghost {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}
.hub-cta__ghost:hover {
  background: #fff;
  color: var(--ink);
}

/* Pyramid see-also — recommended reading (not card grid) */
.hub-see-also {
  margin: clamp(2rem, 4vw, 2.75rem) 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
.hub-see-also h2 {
  margin-bottom: 0.65rem;
}
.hub-see-also__lead {
  margin: 0 0 1rem;
  max-width: 40rem;
  color: var(--muted, #5a5a5a);
}
.hub-see-also__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.hub-see-also__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  align-items: baseline;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}
.hub-see-also__note {
  font-size: 0.88rem;
  color: var(--muted, #5a5a5a);
}

@media (max-width: 700px) {
  .hub-article__hero h1 {
    max-width: none;
    overflow-wrap: anywhere;
    word-break: break-word;
  }
  .hub-toc { display: none; }
  .hub-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hub-cta__actions .btn {
    width: 100%;
  }
}

@media (max-width: 980px) {
  .hub-cta {
    padding-bottom: calc(clamp(2.5rem, 5vw, 3.75rem) + 1rem);
  }
}