@charset "UTF-8";
:root {
  color-scheme: light;
  --ivory: #f6f3e8;
  --paper: #fffdf7;
  --green: #244c3b;
  --sage: #789073;
  --sage-pale: #e7ecdc;
  --ink: #263e34;
  --muted: #637364;
  --rose: #b9665e;
  --gold: #ad915b;
  --line: #d1d7c2;
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --sans: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  background: var(--ivory);
  color: var(--ink);
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
button,
input,
select,
textarea {
  font: inherit;
}
button,
a,
input,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--green);
  padding: 0.55rem 0.9rem;
  min-height: 44px;
  line-height: 1.6;
}
button:hover {
  background: var(--sage-pale);
}
button:disabled {
  cursor: default;
  opacity: 0.65;
}
button[aria-pressed="true"],
.chip.active {
  background: var(--green);
  color: white;
  border-color: var(--green);
}
a {
  color: var(--green);
  text-underline-offset: 4px;
}
a:hover {
  color: var(--rose);
}
a,
button,
input,
select,
textarea {
  touch-action: manipulation;
}
:focus-visible {
  outline: 3px solid #bd6854;
  outline-offset: 5px;
}
img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
figure {
  margin: 0;
}
figcaption {
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--muted);
  padding-top: 0.55rem;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1,
h2,
h3 {
  line-height: 1.5;
  font-weight: 600;
}
h1,
h2 {
  font-family: var(--serif);
}
h1 {
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  letter-spacing: 0.06em;
}
h2 {
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  letter-spacing: 0.04em;
}
h3 {
  font-size: 1.1rem;
}
p {
  margin-bottom: 1.1rem;
}
ul,
ol {
  padding-left: 1.5rem;
}
ruby {
  ruby-align: center;
}
rt {
  font-size: 0.58em;
}
[hidden] {
  display: none !important;
}
.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  z-index: 99;
  top: -90px;
  left: 15px;
  background: white;
  padding: 12px;
}
.skip-link:focus {
  top: 10px;
}
.eyebrow {
  display: block;
  color: var(--muted);
  font-size: 0.73rem;
  letter-spacing: 0.16em;
  font-weight: 600;
  line-height: 1.6;
  margin: 0 0 0.7rem;
}
.button {
  display: inline-flex;
  gap: 2rem;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  background: var(--green);
  color: var(--paper);
  border: 1px solid var(--green);
  padding: 0.8rem 1.5rem;
  border-radius: 4px;
  min-height: 48px;
  font-weight: 600;
  line-height: 1.65;
}
.button:hover {
  background: #355f49;
  color: white;
}
.text-link {
  display: inline-block;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding: 0.5rem 0;
  line-height: 1.5;
}
.quiet {
  font-size: 0.85rem;
  color: var(--muted);
}
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  border-bottom: 1px solid var(--line);
  padding: 0.5rem max(24px, calc((100vw - 1320px) / 2));
  background: var(--ivory);
  position: relative;
  z-index: 10;
}
.brand {
  width: 240px;
  flex: 0 0 240px;
  display: block;
  line-height: 0;
}
.brand-art {
  display: block;
  width: 100%;
  height: auto;
}
.header-logo {
  height: 86px;
}
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.desktop-nav a {
  text-decoration: none;
  font-size: 0.86rem;
  white-space: nowrap;
}
.desktop-nav [aria-current="page"] {
  box-shadow: 0 2px 0 var(--rose);
}
.header-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

#menu-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  border-color: transparent;
  background: none;
}
.menu-bars {
  width: 19px;
  height: 12px;
  border-top: 1px solid;
  border-bottom: 1px solid;
}
.header-menu {
  position: absolute;
  right: 24px;
  top: calc(100% - 1px);
  width: min(360px, calc(100vw - 32px));
  background: var(--paper);
  padding: 1.5rem;
  border: 1px solid var(--line);
  box-shadow: 0 16px 25px #244c3b12;
}
.header-menu nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin-bottom: 1rem;
}
.header-menu nav a {
  font-size: 0.85rem;
  min-height: 40px;
  padding: 0.35rem;
  text-decoration: none;
}
.header-menu input {
  width: 100%;
  border: 1px solid var(--line);
  padding: 0.6rem;
  border-radius: 4px;
  background: white;
}
.header-menu form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.4rem;
}
.header-menu form label {
  grid-column: 1/-1;
  font-size: 0.8rem;
}
.site-footer {
  background: var(--green);
  color: #f2f1e2;
  margin-top: 6rem;
  padding: 3.5rem max(24px, calc((100vw - 1200px) / 2)) 2rem;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
}
.site-footer h2 {
  font-size: 1.25rem;
  max-width: 450px;
  line-height: 1.8;
}
.site-footer p {
  font-size: 0.8rem;
  color: #d1dac9;
}
.site-footer a {
  color: #f2f1e2;
  font-size: 0.85rem;
}
.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-content: flex-start;
}
.footer-bottom {
  border-top: 1px solid #ffffff30;
  margin-top: 2rem;
  padding-top: 1.5rem;
  font-size: 0.7rem;
  display: flex;
  gap: 2rem;
  justify-content: space-between;
}
.hero {
  max-width: 1440px;
  margin: auto;
  display: grid;
  grid-template-columns: 48% 52%;
  padding: 2rem 40px 5rem;
  position: relative;
  overflow: hidden;
  min-height: 700px;
  align-items: center;
}
.hero-copy {
  padding: 1rem 1rem 1rem 3rem;
  z-index: 1;
}
.hero-copy > .eyebrow {
  margin: 0 0 0.4rem 0.4rem;
  letter-spacing: 0.27em;
}
.hero-logo {
  width: calc(100% + 50px);
  margin-left: -28px;
  max-width: none;
}
.hero-line {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.3vw, 2.2rem);
  letter-spacing: 0.12em;
  line-height: 1.8;
  margin: 0 0 1rem;
}
.hero-copy > p:not(.eyebrow):not(.hero-line) {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 2.1;
}
.hero-copy .button {
  margin-top: 0.5rem;
}
.hero-photo {
  height: 570px;
  position: relative;
  padding: 24px 20px 0 10px;
}
.hero-photo:before {
  position: absolute;
  content: "";
  inset: 5px 1px 44px 0;
  border: 1px solid var(--gold);
  border-radius: 48% 48% 2px 2px;
  transform: rotate(3deg);
}
.hero-photo img {
  height: 100%;
  max-height: 510px;
  border-radius: 48% 48% 4px 4px;
  object-position: center;
  position: relative;
  background: var(--sage-pale);
}
.hero-photo figcaption {
  position: relative;
  font-size: 0.63rem;
  letter-spacing: 0.01em;
  text-align: center;
  padding-top: 12px;
}
.photo-seal {
  position: absolute;
  top: 22px;
  right: 4px;
  background: var(--ivory);
  border: 1px solid var(--gold);
  border-radius: 50%;
  width: 92px;
  height: 92px;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-size: 0.7rem;
  line-height: 1.8;
  letter-spacing: 0.17em;
  transform: rotate(10deg);
}
.hero-vine {
  position: absolute;
  width: 45%;
  bottom: 10px;
  left: 24%;
  opacity: 0.6;
  color: var(--sage);
}
.flourish {
  display: block;
  width: min(400px, 75%);
  margin: 1.5rem auto;
  height: auto;
  color: var(--sage);
}
.hero-vine .flourish {
  width: 100%;
}
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 1rem;
}
.section-intro {
  text-align: center;
  margin-bottom: 2.5rem;
}
.section-intro h2 {
  margin-bottom: 0;
}
.portal-section {
  border-top: 1px solid var(--line);
  padding-top: 3.5rem;
}
.portals {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.portal {
  position: relative;
  text-decoration: none;
  text-align: center;
  padding: 0 1.25rem 1.5rem;
  border-right: 1px solid var(--line);
}
.portal:last-child {
  border-right: 0;
}
.portal-number {
  position: absolute;
  top: 0;
  left: 1.5rem;
  font-size: 0.75rem;
  color: var(--gold);
  font-family: Georgia, serif;
}
.portal-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 130px;
}
.portal-illustration svg {
  max-width: 145px;
  max-height: 130px;
}
.portal-illustration.pair svg {
  width: 100px;
}
.portal-illustration.pair svg + svg {
  transform: scaleX(-1);
  margin-left: -12px;
  margin-top: 20px;
}
.portal-art {
  font-family: Georgia, serif;
  display: block;
  height: 130px;
  color: var(--sage);
  font-size: 100px;
  line-height: 130px;
}
.portal h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin: 0.6rem 0;
}
.portal p {
  font-size: 0.77rem;
  color: var(--muted);
  margin-bottom: 1rem;
}
.portal > span:last-child {
  font-size: 0.75rem;
  color: var(--green);
}
.portal:hover .portal-illustration,
.portal:hover .portal-art {
  transform: translateY(-4px);
}
.discovery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
  background: var(--sage-pale);
  max-width: none;
  padding: 5rem max(32px, calc((100vw - 1168px) / 2));
}
.discovery figure img {
  aspect-ratio: 1.22;
  object-fit: cover;
  border-radius: 50% 50% 3px 3px;
}
.discovery h2 {
  font-size: 2rem;
}
.discovery > div > p:not(.eyebrow) {
  font-size: 1rem;
}
.mission {
  border-left: 3px solid var(--gold);
  padding: 1rem 1.4rem;
  background: #edeedc;
  margin: 2rem 0;
}
.mission p {
  margin-bottom: 0.3rem;
}
.mission small {
  color: var(--muted);
  font-size: 0.75rem;
}
.discovery .mission {
  background: #f6f3e885;
}
.learning-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  list-style: none;
  padding: 0;
  gap: 2rem;
}
.learning-steps > * {
  padding: 1rem 0;
  border-top: 1px solid var(--gold);
}
.learning-steps b {
  font-family: var(--serif);
  font-size: 1.1rem;
}
.learning-steps p {
  font-size: 0.87rem;
  color: var(--muted);
  margin-top: 0.8rem;
}
.challenge-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 3rem;
  padding: 2rem 2.5rem;
  background: var(--green);
  color: var(--paper);
  text-decoration: none;
  border-radius: 50px 0 50px 0;
}
.challenge-banner:hover {
  color: white;
  background: #355f49;
}
.challenge-banner .eyebrow {
  color: #b9c9a8;
}
.challenge-banner h3 {
  font: 1.6rem/1.6 var(--serif);
  margin-bottom: 0.5rem;
}
.challenge-banner p {
  font-size: 0.86rem;
  margin: 0;
}
.big-arrow {
  font-size: 2.5rem;
}
.page-content {
  max-width: 1200px;
  margin: auto;
  padding: 2rem 24px;
  min-height: 60vh;
}
.page-heading {
  text-align: center;
  max-width: 850px;
  margin: 2.5rem auto 2rem;
}
.page-heading h1 {
  margin-bottom: 1rem;
}
.page-heading .lede {
  max-width: 660px;
  margin: auto;
  color: var(--muted);
  font-size: 0.95rem;
}
.page-heading .flourish {
  width: 290px;
  margin-top: 1.3rem;
}
.breadcrumb {
  display: flex;
  gap: 0.7rem;
  align-items: center;
  font-size: 0.8rem;
  flex-wrap: wrap;
}
.encyclopedia-tools {
  padding: 1rem 0 2rem;
}
.search-field {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.search-field span {
  font-size: 0.85rem;
}
.search-field input {
  width: min(520px, 70%);
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper);
}
.filter-chips {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chip {
  font-size: 0.8rem;
  border-radius: 30px;
}
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2.2rem;
  margin: 1rem 0 3rem;
}
.article-card {
  position: relative;
  text-decoration: none;
  display: block;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.5rem;
}
.article-card > img {
  aspect-ratio: 1.4;
  object-fit: cover;
  margin-bottom: 1.2rem;
}
.article-card > svg {
  height: 200px;
  width: 100%;
  background: var(--sage-pale);
}
.article-card h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  margin-bottom: 0.7rem;
  padding-right: 1.1rem;
}
.article-card p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
}
.card-arrow {
  position: absolute;
  right: 0;
  bottom: 1.5rem;
  font-size: 1.3rem;
}
.article-card > div {
  padding-right: 0.7rem;
}
.article-card .eyebrow {
  font-size: 0.65rem;
}
.article-actions {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.article-actions button {
  font-size: 0.8rem;
}
.article-toc {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1rem 0;
  border-block: 1px solid var(--line);
  font-size: 0.85rem;
}
.article-toc a {
  text-decoration: none;
}
.article-body {
  max-width: 800px;
  margin: 2.5rem auto;
}
.article-body section {
  scroll-margin-top: 2rem;
  margin-bottom: 3rem;
}
.article-summary {
  font-family: var(--serif);
  font-size: 1.4rem;
  line-height: 1.9;
}
.article-hero img {
  max-height: 600px;
  object-fit: contain;
  background: var(--sage-pale);
}
.article-body h2 {
  font-size: 1.65rem;
}
.prose {
  font-size: 1rem;
  line-height: 2.15;
  overflow-wrap: anywhere;
}
.prose p {
  margin-bottom: 1.5rem;
}
.prose section {
  margin-top: 3rem;
}
.glossary {
  background: var(--sage-pale);
  padding: 1.5rem 2rem;
}
.glossary > div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1rem;
  padding: 0.7rem 0;
}
.glossary dt {
  font-weight: 600;
}
.glossary dd {
  margin: 0;
  font-size: 0.9rem;
}
.photo-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem;
  margin-bottom: 3rem;
}
.photo-row img {
  aspect-ratio: 1.2;
  object-fit: cover;
}
.source-box {
  border-top: 1px solid var(--line);
  padding-top: 2rem;
  font-size: 0.8rem;
  overflow-wrap: anywhere;
}
.source-box h2 {
  font-size: 1.1rem;
}
.source-box li {
  margin-bottom: 0.5rem;
}
.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 2rem;
}
.related-links a {
  font-size: 0.9rem;
}
.body-explorer {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 3rem;
  align-items: center;
  margin: 3rem 0;
}
.body-diagram {
  position: relative;
  background: var(--sage-pale);
  border-radius: 50%;
  aspect-ratio: 1.2;
  padding: 2rem;
}
.body-diagram > svg {
  width: 100%;
  height: 100%;
}
.body-diagram button {
  position: absolute;
  transform: translate(-50%, -50%);
  min-width: 60px;
  font-size: 0.8rem;
  box-shadow: 0 2px 10px #244c3b12;
  border-color: var(--gold);
}
.body-diagram button[aria-pressed="true"] {
  background: var(--green);
  color: white;
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}
.part-photo { margin: 1rem 0; }
.part-zoom, .part-context-image {
  display: block;
  width: 100%;
  height: auto;
  overflow: hidden;
  border-radius: 1rem;
  background: var(--sage-pale);
}
.part-zoom { max-width: 440px; margin-inline: auto; }
.part-context-image { max-height: 420px; margin-top: 1rem; }
.part-photo figcaption, .part-credit, .part-context p {
  font-size: 0.8rem;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
.part-context summary { cursor: pointer; padding: 0.7rem 0; }
.part-credit a { text-decoration: underline; }
.site-search-form { max-width: 750px; margin: 2rem 0 1rem; }
.site-search-form label { display: block; margin-bottom: 0.5rem; }
.site-search-form > div { display: flex; gap: 0.7rem; flex-wrap: wrap; }
.site-search-form input { flex: 1; min-width: 180px; }
#section-results, #search-article-results { margin: 2.5rem 0; }
.section-search-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 270px), 1fr)); gap: 1rem; }
.section-result { display: block; padding: 1.5rem; border: 1px solid var(--gold); border-radius: 1.2rem; background: var(--sage-pale); }
.section-result h3 { margin: 0 0 0.6rem; }
.section-result p { font-size: 0.9rem; line-height: 1.8; }
.section-result span { font-size: 0.8rem; }
.search-empty { padding: 1.5rem; border-left: 4px solid var(--gold); }
.credit-metadata { display: grid; gap: 0.6rem; margin-top: 0.7rem; }
.credit-metadata dt { font-weight: 700; }
.credit-metadata dd { margin: 0; overflow-wrap: anywhere; }
.omochi-profile {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  align-items: center;
  gap: 4rem;
  max-width: 960px;
  margin: 2rem auto 4rem;
}
.omochi-portrait {
  background: var(--sage-pale);
  border-radius: 50%;
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.omochi-portrait svg {
  width: 85%;
}
.omochi-portrait span {
  font-size: 0.75rem;
  color: var(--muted);
}
.profile-list {
  margin: 0 0 1.5rem;
}
.profile-list > div {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding: 0.5rem 0;
  font-size: 0.85rem;
}
.profile-list dt {
  color: var(--muted);
}
.profile-list dd {
  margin: 0;
}
.omochi-profile p {
  font-size: 0.9rem;
}
.observation-notebook {
  max-width: 800px;
  margin: auto;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}
.observation-notebook > p {
  font-size: 0.85rem;
}
#observation-form {
  display: grid;
  gap: 1rem;
}
label {
  font-size: 0.9rem;
}
#observation-form label {
  display: grid;
  gap: 0.4rem;
}
input,
textarea,
select {
  max-width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 4px;
  padding: 0.6rem;
}
textarea {
  resize: vertical;
}
#observation-form .button {
  justify-self: start;
}
.observation {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}
.observation p {
  white-space: pre-wrap;
}
.observation button {
  font-size: 0.75rem;
}
.empty-note {
  padding: 2rem 0;
  color: var(--muted);
}
.quiz-root {
  max-width: 760px;
  margin: 2rem auto;
  background: var(--paper);
  padding: 2.5rem;
  border-radius: 4px;
}
.quiz-progress {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
}
.quiz-progress progress {
  flex: 1;
  height: 5px;
  accent-color: var(--sage);
}
.quiz-root h2 {
  font-size: 1.6rem;
}
.quiz-root > figure {
  max-width: 540px;
  margin: 1.5rem auto;
}
.quiz-root > figure img {
  max-height: 350px;
  object-fit: contain;
}
.quiz-choices {
  display: grid;
  gap: 0.7rem;
}
.quiz-choices button {
  text-align: left;
  padding: 1rem;
}
.quiz-choices .correct {
  background: var(--sage-pale);
  border-color: var(--sage);
  opacity: 1;
}
.quiz-root > svg {
  height: 130px;
  max-width: 100%;
}
#quiz-feedback {
  margin-top: 1.5rem;
}
#quiz-feedback .button {
  display: flex;
  margin-top: 1.5rem;
}
.credits-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2rem;
  margin: 2rem 0 4rem;
}
.credits-grid img {
  aspect-ratio: 1.3;
  object-fit: cover;
}
.credits-grid figcaption {
  overflow-wrap: anywhere;
}
.source-list {
  overflow-wrap: anywhere;
}
.help-layout {
  max-width: 800px;
  margin: auto;
}
.setting-line {
  display: flex;
  gap: 0.7rem;
  align-items: center;
}
.setting-line input {
  width: 20px;
  height: 20px;
  accent-color: var(--green);
}
.quiz-diagram svg {
  max-height: 280px;
  display: block;
  width: 100%;
}
.prose > p:first-child {
  margin-top: 1rem;
}
[data-motion="off"] *,
[data-motion="off"] *:before,
[data-motion="off"] *:after {
  animation: none !important;
  transition: none !important;
  scroll-behavior: auto !important;
}
@media (prefers-reduced-motion: reduce) {
  *,
  *:before,
  *:after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
@media (min-width: 1441px) {
  .hero {
    min-height: 730px;
  }
  .hero-photo {
    height: 590px;
  }
  .hero-photo img {
    max-height: 540px;
  }
}
@media (max-width: 1100px) {
  .site-header {
    padding: 0.5rem 24px;
  }
  .desktop-nav {
    gap: 0.8rem;
  }
  .desktop-nav a {
    font-size: 0.76rem;
  }
  .brand {
    width: 210px;
    flex-basis: 210px;
  }
  .hero {
    padding: 2rem 24px 4rem;
    min-height: 620px;
  }
  .hero-copy {
    padding-left: 1rem;
  }
  .hero-photo {
    height: 500px;
  }
  .hero-photo img {
    max-height: 450px;
  }
  .discovery {
    gap: 3rem;
  }
  .article-grid {
    gap: 1.5rem;
  }
  .portal {
    padding-inline: 0.8rem;
  }
  .portal h3 {
    font-size: 1rem;
  }
  .portal p {
    font-size: 0.7rem;
  }
}
@media (max-width: 850px) {
  .desktop-nav {
    display: none;
  }
  .hero {
    grid-template-columns: 48% 52%;
    padding: 1.5rem 20px 4rem;
    min-height: 560px;
  }
  .hero-copy {
    padding: 0;
  }
  .hero-logo {
    width: calc(100% + 30px);
    margin-left: -18px;
  }
  .hero-copy > .eyebrow {
    font-size: 0.6rem;
  }
  .hero-line {
    font-size: 1.5rem;
  }
  .hero-copy > p:not(.eyebrow):not(.hero-line) {
    font-size: 0.8rem;
  }
  .hero-photo {
    height: 425px;
    padding: 15px 8px 0;
  }
  .hero-photo img {
    max-height: 380px;
  }
  .photo-seal {
    width: 68px;
    height: 68px;
    font-size: 0.53rem;
  }
  .section {
    padding: 3rem 24px;
  }
  .portals {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 2rem;
  }
  .portal:nth-child(2) {
    border-right: 0;
  }
  .portal h3 {
    font-size: 1.15rem;
  }
  .portal p {
    font-size: 0.85rem;
  }
  .discovery {
    padding: 3.5rem 24px;
    gap: 2rem;
  }
  .discovery h2 {
    font-size: 1.7rem;
  }
  .learning-steps {
    gap: 1rem;
  }
  .learning-steps b {
    font-size: 1rem;
  }
  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .credits-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.3rem;
  }
  .omochi-profile {
    gap: 2rem;
  }
  .profile-list > div {
    grid-template-columns: 110px 1fr;
  }
  .footer-top {
    flex-direction: column;
  }
  .body-explorer {
    gap: 1.5rem;
  }
  .body-diagram {
    padding: 0.75rem;
  }
  .body-diagram button {
    min-width: 48px;
    font-size: 0.7rem;
    padding: 0.3rem;
  }
  .body-explorer h2 {
    font-size: 1.4rem;
  }
}
@media (max-width: 600px) {
  :root {
    font-size: 15px;
  }
  .site-header {
    padding: 0.35rem 12px;
    gap: 0.3rem;
  }
  .brand {
    width: 174px;
    flex-basis: 174px;
  }
  .header-logo {
    height: 68px;
  }
  .header-controls {
    gap: 0;
  }

  #menu-toggle {
    padding: 0.45rem;
    min-width: 42px;
    font-size: 0;
  }
  .menu-bars {
    width: 19px;
  }
  .hero {
    display: flex;
    flex-direction: column;
    padding: 1.7rem 22px 3rem;
    min-height: auto;
    overflow: hidden;
  }
  .hero-copy {
    width: 100%;
    text-align: center;
  }
  .hero-copy > .eyebrow {
    font-size: 0.64rem;
    letter-spacing: 0.2em;
    margin: 0;
  }
  .hero-logo {
    max-width: 420px;
    width: calc(100% + 12px);
    margin: -0.5rem auto -0.7rem;
  }
  .hero-line {
    font-size: 1.65rem;
    line-height: 1.7;
    margin: 0.3rem 0 0.8rem;
  }
  .hero-line br {
    display: none;
  }
  .hero-copy > p:not(.eyebrow):not(.hero-line) {
    font-size: 0.82rem;
  }
  .hero-copy .button {
    font-size: 0.85rem;
    margin: 0 0 1.3rem;
    padding: 0.7rem 1.2rem;
  }
  .hero-photo {
    height: auto;
    width: 100%;
    max-width: 410px;
    padding: 13px 8px 0;
    margin-top: 0.5rem;
  }
  .hero-photo img {
    height: 350px;
    max-height: none;
    aspect-ratio: 1.06;
  }
  .hero-photo:before {
    inset: 0 0 28px 0;
  }
  .hero-photo figcaption {
    font-size: 0.58rem;
    padding-top: 8px;
  }
  .photo-seal {
    top: 5px;
    right: 0;
  }
  .hero-vine {
    display: none;
  }
  .section {
    padding: 2.6rem 20px;
  }
  .section-intro {
    margin-bottom: 1.8rem;
  }
  .section-intro h2 {
    font-size: 1.6rem;
  }
  .portal {
    padding: 0 0.65rem 1rem;
  }
  .portal-number {
    left: 0.4rem;
    font-size: 0.65rem;
  }
  .portal-illustration,
  .portal-art {
    height: 110px;
  }
  .portal-illustration svg {
    max-height: 105px;
    width: 120px;
  }
  .portal-illustration.pair svg {
    width: 75px;
  }
  .portal-art {
    font-size: 80px;
    line-height: 110px;
  }
  .portal h3 {
    font-size: 1.05rem;
    letter-spacing: -0.02em;
  }
  .portal p {
    font-size: 0.72rem;
    line-height: 1.75;
    min-height: 2.6rem;
    margin-bottom: 0.5rem;
  }
  .portal > span:last-child {
    font-size: 0.7rem;
  }
  .portals {
    row-gap: 1rem;
  }
  .discovery {
    display: flex;
    flex-direction: column;
    padding: 3rem 22px;
    gap: 1.5rem;
  }
  .discovery > div {
    width: 100%;
  }
  .discovery h2 {
    font-size: 1.8rem;
  }
  .discovery figure {
    width: 100%;
  }
  .discovery figure img {
    aspect-ratio: 1.22;
  }
  .mission {
    margin: 1.5rem 0;
    padding: 0.8rem 1rem;
  }
  .learning-steps {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .learning-steps > * {
    padding: 1rem 0 0.3rem;
  }
  .learning-steps p {
    margin: 0.4rem 0 0.6rem;
  }
  .challenge-banner {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 35px 0 35px 0;
    gap: 0.7rem;
  }
  .challenge-banner h3 {
    font-size: 1.3rem;
  }
  .challenge-banner p {
    font-size: 0.75rem;
  }
  .big-arrow {
    font-size: 1.8rem;
  }
  .page-content {
    padding: 1rem 18px;
  }
  .page-heading {
    margin: 2rem auto 1rem;
  }
  .page-heading h1 {
    font-size: 1.8rem;
    overflow-wrap: anywhere;
  }
  .page-heading .lede {
    font-size: 0.85rem;
  }
  .page-heading .flourish {
    width: 220px;
    margin-block: 1rem;
  }
  .search-field {
    flex-direction: column;
    gap: 0.5rem;
  }
  .search-field input {
    width: 100%;
  }
  .filter-chips {
    justify-content: flex-start;
    gap: 0.4rem;
  }
  .chip {
    font-size: 0.7rem;
    padding: 0.45rem 0.7rem;
  }
  .article-grid {
    gap: 1.4rem 1rem;
  }
  .article-card > img {
    aspect-ratio: 1.1;
    margin-bottom: 0.8rem;
  }
  .article-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.45rem;
  }
  .article-card p {
    font-size: 0.73rem;
    line-height: 1.85;
  }
  .article-card .eyebrow {
    font-size: 0.58rem;
    letter-spacing: 0.06em;
  }
  .card-arrow {
    font-size: 1rem;
  }
  .article-card > div {
    padding-right: 0.15rem;
  }
  .article-actions {
    gap: 0.4rem;
  }
  .article-actions button {
    font-size: 0.72rem;
    padding: 0.45rem 0.6rem;
  }
  .article-toc {
    gap: 0.7rem 1rem;
    font-size: 0.75rem;
  }
  .article-body {
    margin-top: 2rem;
  }
  .article-summary {
    font-size: 1.25rem;
  }
  .article-body h2 {
    font-size: 1.45rem;
  }
  .prose {
    font-size: 0.95rem;
    line-height: 2.2;
  }
  .glossary {
    padding: 1rem;
  }
  .glossary > div {
    grid-template-columns: 85px 1fr;
    gap: 0.7rem;
  }
  .glossary dd {
    font-size: 0.8rem;
  }
  .photo-row {
    gap: 0.8rem;
  }
  .source-box {
    font-size: 0.73rem;
  }
  .body-explorer {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .body-diagram {
    max-width: 460px;
    width: 100%;
    margin: auto;
  }
  .body-diagram button {
    min-height: 40px;
    font-size: 0.8rem;
  }
  .omochi-profile {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin: 1.5rem auto 2rem;
  }
  .omochi-portrait {
    width: 230px;
    margin: auto;
  }
  .omochi-profile h2 {
    text-align: center;
  }
  .omochi-profile .eyebrow {
    text-align: center;
  }
  .profile-list > div {
    grid-template-columns: 130px 1fr;
  }
  .quiz-root {
    padding: 1.2rem;
    margin-top: 1.5rem;
  }
  .quiz-root h2 {
    font-size: 1.3rem;
  }
  .quiz-choices button {
    font-size: 0.85rem;
    padding: 0.8rem;
  }
  .credits-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem 1rem;
  }
  .credits-grid figcaption {
    font-size: 0.65rem;
  }
  .site-footer {
    margin-top: 3rem;
    padding: 2.5rem 20px 1.5rem;
  }
  .site-footer h2 {
    font-size: 1.1rem;
  }
  .footer-top {
    gap: 1rem;
  }
  .footer-links {
    gap: 0.7rem 1.2rem;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 0.5rem;
  }
  .header-menu {
    right: 12px;
  }
  .source-list {
    font-size: 0.85rem;
  }
}
@media (max-width: 350px) {
  .brand {
    width: 151px;
    flex-basis: 151px;
  }
  .header-logo {
    height: 60px;
  }

  .hero {
    padding-inline: 17px;
  }
  .hero-line {
    font-size: 1.38rem;
  }
  .hero-photo img {
    height: 290px;
  }
  .portal h3 {
    font-size: 0.95rem;
  }
  .page-content {
    padding-inline: 14px;
  }
  .article-card h3 {
    font-size: 1rem;
  }
  .article-card p {
    font-size: 0.7rem;
  }
  .profile-list > div {
    grid-template-columns: 110px 1fr;
  }
  .article-actions button {
    font-size: 0.65rem;
  }
  .article-toc {
    font-size: 0.7rem;
  }
  .page-heading h1 {
    font-size: 1.65rem;
  }
}
.bird-video {
  margin: 2rem 0;
  padding: 1.2rem;
  background: var(--sage-pale);
}
.bird-video video {
  display: block;
  width: 100%;
  max-height: 500px;
  background: #1f3027;
}
.bird-video button {
  margin-top: 0.8rem;
  font-size: 0.8rem;
}
.bird-video figcaption {
  line-height: 1.8;
}
.bird-video a {
  overflow-wrap: anywhere;
}
.observation-card-art {
  background: var(--sage-pale);
  aspect-ratio: 1.4;
  display: flex;
  position: relative;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.2rem;
}
.observation-card-art svg {
  height: 90%;
  max-width: 90%;
}
.observation-card-art small {
  position: absolute;
  bottom: 0.35rem;
  right: 0.6rem;
  font-size: 0.6rem;
  color: var(--muted);
}
.video-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.video-buttons button {
  min-height: 44px;
}

/* Safe-area gutters retain room for notches and home indicators. */
:root {
  --header-gutter: max(24px, calc((100vw - 1320px) / 2));
  --footer-gutter: max(24px, calc((100vw - 1200px) / 2));
  --page-gutter: 24px;
}
.site-header {
  padding-top: max(0.5rem, env(safe-area-inset-top));
  padding-left: max(var(--header-gutter), env(safe-area-inset-left));
  padding-right: max(var(--header-gutter), env(safe-area-inset-right));
}
.site-footer {
  padding-left: max(var(--footer-gutter), env(safe-area-inset-left));
  padding-right: max(var(--footer-gutter), env(safe-area-inset-right));
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
}
.page-content {
  padding-left: max(var(--page-gutter), env(safe-area-inset-left));
  padding-right: max(var(--page-gutter), env(safe-area-inset-right));
}
.home-content {
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}
#menu-toggle, .body-diagram button {
  min-height: 44px;
  min-width: 44px;
}
.desktop-nav a, .header-menu nav a, .footer-links a, .article-toc a, .text-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
input:not([type="checkbox"]):not([type="radio"]):not([type="range"]), select, textarea {
  min-height: 44px;
}
.setting-line {
  min-height: 44px;
}
.page-tools {
  margin-top: 2rem;
  border-top: 1px solid #ffffff30;
  padding-top: 1.5rem;
}
.page-tools-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.page-tools button {
  min-width: 44px;
  min-height: 44px;
  font-size: 0.85rem;
}
#page-share-status {
  margin: 0.7rem 0 0;
  overflow-wrap: anywhere;
}
#page-share-status:empty {
  margin: 0;
}
#page-share-fallback {
  max-width: 42rem;
  margin-top: 0.8rem;
}
#page-share-fallback label {
  display: block;
  font-size: 0.85rem;
}
#page-share-url {
  width: 100%;
  min-width: 0;
  padding: 0.6rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink);
  background: var(--paper);
  font-size: 1rem;
}
@media (max-width: 1100px) {
  :root { --header-gutter: 24px; }
}
@media (max-width: 600px) {
  :root { --header-gutter: 12px; --footer-gutter: 20px; --page-gutter: 18px; }
  .header-menu { right: max(12px, env(safe-area-inset-right)); }
}
@media (max-width: 350px) {
  :root { --page-gutter: 14px; }
}

/* Alpha-only derivative preserves the approved artwork's RGB; no blend/filter tint. */
.site-header, .hero-copy { background: var(--ivory); isolation: isolate; }
.site-header .brand-art.header-logo,
.hero-copy > .brand-art.hero-logo { mix-blend-mode: normal; filter: none; }
.brand { width: 150px; flex-basis: 150px; }
.brand-art.header-logo { width: 100%; height: auto; object-fit: contain; }
.brand-art.hero-logo { width: 100%; max-width: 380px; height: auto; margin: .75rem auto 1.1rem; }
@media (max-width: 600px) {
  .brand { width: 136px; flex-basis: 136px; }
  .brand-art.hero-logo { max-width: 270px; margin: .65rem auto 1rem; }
}
@media (max-width: 350px) { .brand { width: 128px; flex-basis: 128px; } }
@media (forced-colors: active) {
  .site-header .brand-art.header-logo,
  .hero-copy > .brand-art.hero-logo { mix-blend-mode: normal; filter: none; }
}