/* Portal de la enciclopedia EDUFISICA. Estilos limitados a body.portal. */
body.portal {
  --portal-navy: #092333;
  --portal-orange: #f56a14;
  --portal-teal: #075b78;
  --portal-cream: #f7f7f2;
  --portal-white: #fff;
  --portal-muted: #536670;
  --portal-line: #d3dfdf;
  --portal-soft: #eaf1f1;
  margin: 0;
  background: var(--portal-cream);
  color: var(--portal-navy);
  color-scheme: light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

.portal *,
.portal *::before,
.portal *::after { box-sizing: border-box; }
.portal [hidden] { display: none !important; }
.portal img { display: block; max-width: 100%; height: auto; }
.portal svg { max-width: 100%; }
.portal a { color: var(--portal-teal); text-underline-offset: .22em; }
.portal a:hover { color: var(--portal-navy); }
.portal button,
.portal input,
.portal select { font: inherit; color: inherit; }
.portal button,
.portal a,
.portal input,
.portal select { touch-action: manipulation; }
.portal button { cursor: pointer; }
.portal :is(a, button, input, select, summary):focus-visible {
  outline: 3px solid var(--portal-teal);
  outline-offset: 4px;
}
.portal h1,
.portal h2,
.portal h3 {
  margin-top: 0;
  color: var(--portal-navy);
  overflow-wrap: break-word;
  text-wrap: balance;
}
.portal p { margin-top: 0; overflow-wrap: break-word; }
.portal .sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.portal .portal-wrap {
  width: min(1240px, calc(100% - 64px));
  margin-inline: auto;
  min-width: 0;
}

.portal .portal-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--portal-white);
  border-bottom: 1px solid var(--portal-line);
}
.portal .portal-header > .portal-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  min-height: 86px;
  padding-block: 12px;
}
.portal .portal-brand {
  display: inline-flex;
  flex: 0 1 auto;
  align-items: center;
  gap: 12px;
  min-width: 0;
  min-height: 48px;
  color: var(--portal-navy);
  text-decoration: none;
  font-size: 23px;
  font-weight: 850;
  letter-spacing: .5px;
  line-height: 1.15;
}
.portal .portal-brand img {
  width: 48px;
  height: 48px;
  flex: 0 0 48px;
  object-fit: contain;
}
.portal .portal-brand > span { display: block; min-width: 0; }
.portal .portal-brand small {
  display: block;
  margin-top: 5px;
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 1.35px;
  line-height: 1.45;
}
.portal #portal-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 4px 13px;
  min-width: 0;
}
.portal #portal-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--portal-navy);
  text-decoration: none;
  text-align: center;
  font-size: 14px;
  font-weight: 650;
  line-height: 1.35;
}
.portal #portal-nav a:hover,
.portal #portal-nav a[aria-current="page"] {
  background: var(--portal-soft);
  color: var(--portal-teal);
}
.portal .portal-menu {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 76px;
  min-height: 46px;
  padding: 10px 13px;
  border: 1px solid #738e98;
  border-radius: 8px;
  background: var(--portal-white);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.3;
}
.portal .portal-menu[aria-expanded="true"] {
  background: var(--portal-soft);
  border-color: var(--portal-teal);
}

.portal main.portal-wrap { padding-bottom: 68px; }
.portal .portal-hero,
.portal .topic-hero {
  padding-block: 52px 26px;
  max-width: 1050px;
}
.portal .portal-hero h1,
.portal .topic-hero h1 {
  max-width: 1040px;
  margin-bottom: 23px;
  font-size: clamp(36px, 4.4vw, 59px);
  font-weight: 800;
  letter-spacing: -1.75px;
  line-height: 1.12;
}
.portal .lead,
.portal .portal-hero > p:not(.eyebrow),
.portal .topic-hero > p:not(.eyebrow) {
  max-width: 900px;
  margin-bottom: 20px;
  color: var(--portal-muted);
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
}
.portal .eyebrow {
  margin-bottom: 12px;
  color: var(--portal-teal);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.6px;
  line-height: 1.5;
  text-transform: uppercase;
}
.portal .portal-search {
  max-width: 980px;
  margin-block: 8px 32px;
  padding: 24px;
  border: 1px solid var(--portal-line);
  border-radius: 15px;
  background: var(--portal-white);
}
.portal .portal-search form { margin: 0; min-width: 0; }
.portal .portal-search label {
  display: block;
  margin-bottom: 9px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
}
.portal .search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: stretch;
  min-width: 0;
}
.portal .search-row input[type="search"] {
  width: 100%;
  min-width: 0;
  min-height: 52px;
  padding: 12px 16px;
  border: 1px solid #738e98;
  border-radius: 9px;
  background: var(--portal-white);
  font-size: 17px;
  line-height: 1.4;
}
.portal input::placeholder { color: #61747d; opacity: 1; }
.portal .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: fit-content;
  max-width: 100%;
  min-height: 46px;
  padding: 11px 19px;
  border: 1px solid #738e98;
  border-radius: 9px;
  background: var(--portal-white);
  color: var(--portal-navy);
  text-decoration: none;
  text-align: center;
  font-size: 14px;
  font-weight: 750;
  line-height: 1.4;
  white-space: normal;
  overflow-wrap: break-word;
  transition: background-color .15s ease, border-color .15s ease;
}
.portal .button.primary {
  border-color: var(--portal-orange);
  background: var(--portal-orange);
  color: var(--portal-navy);
}
.portal .button:hover {
  border-color: var(--portal-teal);
  background: var(--portal-soft);
  color: var(--portal-navy);
}
.portal .button.primary:hover {
  border-color: #e96010;
  background: #e96010;
}
.portal .search-row .button { min-height: 52px; }
.portal .button:disabled {
  opacity: .6;
  cursor: default;
}

.portal .section-heading {
  max-width: 880px;
  margin-block: 46px 24px;
}
.portal .section-heading h2 {
  margin-bottom: 13px;
  font-size: clamp(27px, 2.8vw, 38px);
  font-weight: 780;
  letter-spacing: -.8px;
  line-height: 1.24;
}
.portal .section-heading p:not(.eyebrow) {
  max-width: 800px;
  margin-bottom: 0;
  color: var(--portal-muted);
  font-size: 16px;
  line-height: 1.75;
}
.portal .topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  align-items: stretch;
}
.portal .topic-card {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  grid-template-rows: auto auto 1fr auto;
  align-items: start;
  gap: 16px 14px;
  min-width: 0;
  min-height: 294px;
  padding: 25px;
  border: 1px solid var(--portal-line);
  border-radius: 16px;
  background: var(--portal-white);
  color: var(--portal-navy);
  text-decoration: none;
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.portal .topic-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--portal-soft);
  color: var(--portal-teal);
}
.portal .topic-icon svg { display: block; width: 32px; height: 32px; }
.portal .topic-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  align-self: center;
  gap: 4px;
  min-width: 0;
  color: var(--portal-muted);
  text-align: right;
  font-size: 13px;
  line-height: 1.45;
  overflow-wrap: break-word;
}
.portal .topic-meta small {
  color: var(--portal-teal);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .75px;
  text-transform: uppercase;
}
.portal .topic-meta :is(.count, .topic-count, span) {
  color: var(--portal-navy);
  font-size: 13px;
  font-weight: 650;
}
.portal .topic-card > h3 {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 23px;
  font-weight: 750;
  letter-spacing: -.35px;
  line-height: 1.32;
}
.portal .topic-card > p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--portal-muted);
  font-size: 15px;
  line-height: 1.75;
}
.portal .topic-link {
  grid-column: 1 / -1;
  align-self: end;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 28px;
  margin-top: 2px;
  color: var(--portal-teal);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.4;
}
.portal .topic-card:hover,
.portal .topic-card:focus-visible {
  border-color: var(--portal-teal);
  color: var(--portal-navy);
  box-shadow: 0 8px 24px #0923330d;
}
.portal .quick-routes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 12px;
  margin-block: 25px 36px;
}
.portal .quick-routes > a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  min-height: 56px;
  padding: 14px 18px;
  border: 1px solid var(--portal-line);
  border-radius: 11px;
  background: var(--portal-white);
  color: var(--portal-navy);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
  overflow-wrap: break-word;
}
.portal .quick-routes > a:hover {
  border-color: var(--portal-teal);
  background: var(--portal-soft);
}

.portal .featured-grid,
.portal .reading-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  align-items: stretch;
}
.portal .reading-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--portal-line);
  border-radius: 15px;
  background: var(--portal-white);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.portal .reading-card:hover {
  border-color: #a6bdc1;
  box-shadow: 0 8px 24px #0923330d;
}
.portal .reading-card > a:first-child {
  display: block;
  width: 100%;
  border-radius: 14px 14px 0 0;
}
.portal .reading-card > img,
.portal .reading-card > a:first-child > img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: cover;
  border-radius: 14px 14px 0 0;
  background: var(--portal-soft);
}
.portal .reading-card img.archive-thumb {
  object-fit: contain;
  padding: 8px;
  background: #edf2f2;
}
.portal .reading-card > div {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
  padding: 23px;
}
.portal .reading-card small {
  display: block;
  margin-bottom: 10px;
  color: var(--portal-teal);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .7px;
  line-height: 1.6;
  text-transform: uppercase;
  overflow-wrap: break-word;
}
.portal .reading-card h3 {
  margin-bottom: 13px;
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -.4px;
  line-height: 1.34;
}
.portal .reading-card h3 a {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  color: inherit;
  text-decoration: none;
}
.portal .reading-card h3 a:hover { text-decoration: underline; }
.portal .reading-card p {
  flex: 1;
  margin-bottom: 18px;
  color: var(--portal-muted);
  font-size: 15px;
  line-height: 1.75;
}
.portal .reading-card .button { margin-top: auto; }
.portal .reading-card .reading-link {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  margin-top: auto;
  padding-block: 8px;
  color: var(--portal-teal);
  text-decoration: none;
  font-size: 14px;
  font-weight: 750;
  line-height: 1.5;
}
.portal .reading-card .reading-link:hover { text-decoration: underline; }
.portal .more-readings {
  display: flex;
  min-height: 48px;
  margin: 28px auto 0;
}

.portal .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px 10px;
  min-width: 0;
  margin-block: 18px 0;
  color: var(--portal-muted);
  font-size: 13px;
  line-height: 1.6;
  overflow-wrap: break-word;
}
.portal .breadcrumb a {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  color: var(--portal-teal);
  text-decoration: none;
}
.portal .breadcrumb a:hover { text-decoration: underline; }
.portal .breadcrumb + .topic-hero { padding-top: 22px; }
.portal .topic-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 23px;
}
.portal .topic-actions > a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  max-width: 100%;
  padding: 10px 16px;
  border: 1px solid #738e98;
  border-radius: 8px;
  background: var(--portal-white);
  color: var(--portal-teal);
  text-decoration: none;
  text-align: center;
  font-size: 14px;
  font-weight: 650;
  line-height: 1.4;
  overflow-wrap: break-word;
}
.portal .topic-actions > a:hover { background: var(--portal-soft); }
.portal .article-filters {
  display: grid;
  grid-template-columns: minmax(0, 2fr) repeat(2, minmax(0, 1fr));
  align-items: end;
  gap: 8px 18px;
  margin-block: 10px 25px;
  padding: 22px;
  border: 1px solid var(--portal-line);
  border-radius: 14px;
  background: var(--portal-white);
}
.portal .article-filters label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  color: var(--portal-navy);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.5;
}
.portal .article-filters > label[for="reading-search"] {
  display: block;
  grid-column: 1;
  grid-row: 1;
}
.portal .article-filters > #reading-search {
  grid-column: 1;
  grid-row: 2;
}
.portal .article-filters > label:not([for="reading-search"]) {
  grid-row: 1 / span 2;
}
.portal .article-filters > button {
  grid-column: 3;
  grid-row: 2;
  width: 100%;
  min-height: 48px;
}
.portal .article-filters :is(input, select) {
  width: 100%;
  min-width: 0;
  min-height: 48px;
  padding: 11px 13px;
  border: 1px solid #738e98;
  border-radius: 8px;
  background: var(--portal-white);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.5;
}
.portal .search-results { min-width: 0; }
.portal #search-status {
  margin-block: 19px 24px;
  color: var(--portal-muted);
  font-size: 14px;
  line-height: 1.7;
}
.portal #empty {
  margin-block: 24px;
  padding: 28px;
  border: 1px dashed #a8c0c4;
  border-radius: 13px;
  background: var(--portal-soft);
  color: var(--portal-navy);
  font-size: 16px;
  line-height: 1.8;
}

.portal .area-note {
  min-width: 0;
  margin-block: 18px 32px;
  padding: 19px 23px;
  border-left: 4px solid var(--portal-teal);
  border-radius: 0 12px 12px 0;
  background: var(--portal-soft);
  color: var(--portal-navy);
  font-size: 15px;
  line-height: 1.8;
}
.portal .area-note > :last-child { margin-bottom: 0; }
.portal .other-areas {
  margin-top: 62px;
  padding-top: 6px;
  border-top: 1px solid var(--portal-line);
}
.portal .other-areas > .section-heading { margin-top: 36px; }

/* Cronología: un único bloque, con apertura nativa de cada periodo. */
.portal .timeatlas {
  max-width: 1080px;
  margin-block: 42px 62px;
}
.portal .timeatlas > h2 {
  margin-bottom: 17px;
  font-size: clamp(27px, 2.8vw, 38px);
  font-weight: 780;
  letter-spacing: -.75px;
  line-height: 1.25;
}
.portal .timeatlas > p:not(.eyebrow) {
  max-width: 810px;
  color: var(--portal-muted);
  font-size: 16px;
  line-height: 1.75;
}
.portal .eras {
  margin-top: 26px;
  padding-inline-start: 26px;
  border-inline-start: 3px solid var(--portal-orange);
}
.portal .era {
  position: relative;
  min-width: 0;
  margin-bottom: 17px;
  border: 1px solid var(--portal-line);
  border-radius: 13px;
  background: var(--portal-white);
}
.portal .era::before {
  content: "";
  position: absolute;
  inset-inline-start: -36px;
  top: 26px;
  width: 18px;
  height: 18px;
  border: 3px solid var(--portal-cream);
  border-radius: 50%;
  background: var(--portal-orange);
}
.portal .era > summary {
  display: grid;
  grid-template-columns: minmax(125px, .3fr) minmax(0, 1fr) 28px;
  align-items: center;
  gap: 20px;
  min-height: 76px;
  padding: 20px 24px;
  border-radius: 12px;
  cursor: pointer;
  list-style: none;
}
.portal .era > summary::-webkit-details-marker { display: none; }
.portal .era > summary::marker { content: ""; }
.portal .era > summary span {
  min-width: 0;
  color: var(--portal-teal);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.5;
  overflow-wrap: break-word;
}
.portal .era > summary strong {
  min-width: 0;
  color: var(--portal-navy);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  overflow-wrap: break-word;
}
.portal .era > summary i {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  color: var(--portal-teal);
  font-size: 28px;
  font-style: normal;
  font-weight: 500;
  line-height: 1;
  transition: transform .15s ease;
}
.portal .era[open] > summary {
  border-bottom: 1px solid var(--portal-line);
  border-radius: 12px 12px 0 0;
  background: var(--portal-soft);
}
.portal .era[open] > summary i { transform: rotate(45deg); }
.portal .era > ul {
  margin: 0;
  padding: 0 24px 13px;
  list-style: none;
}
.portal .era li {
  min-width: 0;
  padding-block: 14px;
  border-top: 1px solid var(--portal-line);
}
.portal .era li:first-child { border-top: 0; }
.portal .era li a {
  display: flex;
  align-items: center;
  min-height: 46px;
  padding-block: 5px;
  font-size: 16px;
  font-weight: 650;
  line-height: 1.6;
}
.portal .era small {
  display: block;
  margin-top: 2px;
  color: var(--portal-muted);
  font-size: 13px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

.portal .topic-connections { margin-block: 40px 52px; }
.portal .topic-connections > p {
  max-width: 830px;
  color: var(--portal-muted);
  font-size: 16px;
  line-height: 1.75;
}
.portal .topic-connections details {
  min-width: 0;
  border: 1px solid var(--portal-line);
  border-radius: 13px;
  background: var(--portal-white);
}
.portal .topic-connections summary {
  min-height: 66px;
  padding: 20px 24px;
  border-radius: 12px;
  color: var(--portal-navy);
  cursor: pointer;
  font-size: 17px;
  font-weight: 750;
  line-height: 1.55;
  list-style-position: inside;
  overflow-wrap: break-word;
}
.portal .topic-connections summary::marker { color: var(--portal-teal); }
.portal .topic-connections details[open] > summary {
  border-bottom: 1px solid var(--portal-line);
  border-radius: 12px 12px 0 0;
  background: var(--portal-soft);
}
.portal .topic-connections ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 24px;
  margin: 0;
  padding: 7px 24px 18px;
  list-style: none;
}
.portal .topic-connections li {
  min-width: 0;
  padding-block: 13px;
  border-top: 1px solid var(--portal-line);
}
.portal .topic-connections li:nth-child(-n + 2) { border-top: 0; }
.portal .topic-connections li a {
  display: flex;
  align-items: center;
  min-height: 46px;
  padding-block: 4px;
  font-size: 15px;
  font-weight: 650;
  line-height: 1.65;
}
.portal .topic-connections li :is(small, label, .label, .connection-label) {
  display: block;
  margin-top: 3px;
  color: var(--portal-muted);
  font-size: 12px;
  font-weight: 450;
  line-height: 1.7;
}

.portal .portal-footer {
  padding-block: 32px 38px;
  border-top: 1px solid var(--portal-line);
  background: var(--portal-white);
  color: var(--portal-muted);
  font-size: 14px;
  line-height: 1.7;
}
.portal .portal-footer > .portal-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px 38px;
}
.portal .portal-footer p { max-width: 620px; margin-bottom: 0; }
.portal .portal-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 19px;
}
.portal .portal-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  color: var(--portal-teal);
}
.portal .portal-footer strong { color: var(--portal-navy); }

@media (hover: hover) and (pointer: fine) {
  .portal .topic-card:hover { transform: translateY(-2px); }
}

@media (max-width: 1080px) {
  .portal .topic-grid,
  .portal .featured-grid,
  .portal .reading-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .portal .portal-header > .portal-wrap { gap: 16px; }
  .portal #portal-nav { gap: 2px 4px; }
  .portal #portal-nav a { padding-inline: 8px; font-size: 13px; }
}

@media (max-width: 900px) {
  .portal .portal-header > .portal-wrap {
    flex-wrap: wrap;
    gap: 10px 14px;
    min-height: 80px;
  }
  .portal .portal-brand { margin-right: auto; }
  .portal .portal-menu { display: inline-flex; flex: 0 0 auto; }
  .portal #portal-nav {
    display: grid;
    flex: 1 0 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    justify-content: stretch;
    gap: 6px;
    padding-block: 6px 3px;
  }
  .portal .portal-menu[aria-expanded="false"] + #portal-nav { display: none; }
  .portal #portal-nav a {
    justify-content: flex-start;
    padding: 12px 14px;
    background: var(--portal-cream);
    text-align: left;
    font-size: 14px;
  }
  .portal .portal-hero,
  .portal .topic-hero { padding-top: 38px; }
  .portal .article-filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .portal .article-filters > label[for="reading-search"] { grid-column: 1 / -1; }
  .portal .article-filters > #reading-search { grid-column: 1 / -1; }
  .portal .article-filters > label:not([for="reading-search"]) { grid-row: auto; }
  .portal .article-filters > button { grid-column: 2; grid-row: auto; }
}

@media (max-width: 640px) {
  .portal .portal-wrap { width: calc(100% - 32px); }
  .portal main.portal-wrap { padding-bottom: 46px; }
  .portal .portal-header > .portal-wrap { padding-block: 11px; }
  .portal .portal-brand { gap: 9px; font-size: 21px; letter-spacing: .25px; }
  .portal .portal-brand small { max-width: 170px; font-size: 9px; letter-spacing: 1px; }
  .portal #portal-nav { grid-template-columns: minmax(0, 1fr); }
  .portal .portal-hero,
  .portal .topic-hero { padding-block: 30px 15px; }
  .portal .portal-hero h1,
  .portal .topic-hero h1 { margin-bottom: 19px; letter-spacing: -1.1px; line-height: 1.16; }
  .portal .lead,
  .portal .portal-hero > p:not(.eyebrow),
  .portal .topic-hero > p:not(.eyebrow) { font-size: 17px; line-height: 1.75; }
  .portal .portal-search { padding: 19px; margin-block: 5px 24px; }
  .portal .search-row { grid-template-columns: minmax(0, 1fr); gap: 11px; }
  .portal .search-row .button { width: 100%; }
  .portal .search-row input[type="search"] { font-size: 16px; }
  .portal .section-heading { margin-block: 34px 20px; }
  .portal .section-heading h2 { letter-spacing: -.45px; }
  .portal .topic-grid,
  .portal .featured-grid,
  .portal .reading-grid { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .portal .topic-card { min-height: 0; padding: 23px; gap: 15px 14px; }
  .portal .topic-card > h3 { font-size: 23px; }
  .portal .topic-card > p { font-size: 16px; }
  .portal .topic-link { font-size: 15px; }
  .portal .quick-routes { margin-block: 21px 28px; gap: 10px; }
  .portal .quick-routes > a { min-height: 54px; font-size: 15px; }
  .portal .reading-card > div { padding: 22px; }
  .portal .reading-card h3 { font-size: 23px; }
  .portal .reading-card p { font-size: 16px; }
  .portal .reading-card .button { min-height: 48px; }
  .portal .breadcrumb { margin-top: 11px; font-size: 12px; }
  .portal .breadcrumb + .topic-hero { padding-top: 15px; }
  .portal .topic-actions { gap: 9px; margin-top: 20px; }
  .portal .article-filters { grid-template-columns: minmax(0, 1fr); gap: 15px; padding: 19px; }
  .portal .article-filters > label[for="reading-search"] {
    grid-column: auto;
    grid-row: auto;
    margin-bottom: -7px;
  }
  .portal .article-filters > #reading-search,
  .portal .article-filters > button { grid-column: auto; grid-row: auto; }
  .portal #empty { padding: 23px; }
  .portal .area-note { margin-block: 16px 26px; padding: 17px 19px; }
  .portal .other-areas { margin-top: 46px; padding-top: 2px; }
  .portal .other-areas > .section-heading { margin-top: 28px; }
  .portal .timeatlas { margin-block: 33px 44px; }
  .portal .eras { padding-inline-start: 18px; margin-top: 23px; }
  .portal .era { margin-bottom: 14px; }
  .portal .era::before { inset-inline-start: -29px; top: 24px; }
  .portal .era > summary {
    grid-template-columns: minmax(0, 1fr) 28px;
    gap: 8px 12px;
    padding: 17px 16px;
  }
  .portal .era > summary span { grid-column: 1; grid-row: 1; font-size: 13px; }
  .portal .era > summary strong { grid-column: 1; grid-row: 2; font-size: 16px; }
  .portal .era > summary i { grid-column: 2; grid-row: 1 / span 2; }
  .portal .era > ul { padding: 0 17px 9px; }
  .portal .era li { padding-block: 12px; }
  .portal .era li a { font-size: 15px; }
  .portal .era small { font-size: 12px; }
  .portal .topic-connections { margin-block: 30px 40px; }
  .portal .topic-connections summary { padding: 17px 19px; font-size: 16px; }
  .portal .topic-connections ul { grid-template-columns: minmax(0, 1fr); padding: 6px 19px 13px; }
  .portal .topic-connections li:nth-child(2) { border-top: 1px solid var(--portal-line); }
  .portal .portal-footer { padding-block: 25px 31px; }
  .portal .portal-footer > .portal-wrap { gap: 15px; }
}

@media (max-width: 370px) {
  .portal .portal-brand { font-size: 19px; }
  .portal .portal-brand img { width: 44px; height: 44px; flex-basis: 44px; }
  .portal .portal-menu { min-width: 68px; padding-inline: 10px; }
  .portal .portal-brand small { max-width: 148px; font-size: 8px; }
  .portal .portal-hero h1,
  .portal .topic-hero h1 { font-size: 33px; }
}

@media (prefers-reduced-motion: reduce) {
  .portal *,
  .portal *::before,
  .portal *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .portal .topic-card:hover { transform: none; }
}

@media (forced-colors: active) {
  .portal :is(.topic-card, .reading-card, .portal-search, .quick-routes > a, .article-filters) {
    border-color: CanvasText;
  }
  .portal :is(a, button, input, select, summary):focus-visible { outline-color: Highlight; }
}
/* Keyboard access remains available without adding a visible header row. */
.portal .skip { position: fixed; top: 8px; left: 8px; z-index: 1000; padding: 12px 18px; background: #092333; color: #fff; border-radius: 8px; transform: translateY(-180%); }
.portal .skip:focus { transform: translateY(0); }