@charset "UTF-8";
:root {
  --paper: #FBFAF6;
  --surface: #FFFFFF;
  --wash: #F3F1EA;
  --line: #E8E4DA;
  --ink: #2A302D;
  --ink-soft: #586059;
  --muted: #6E746E;
  --olne: #3CCC82;
  --green: #2C6A4F;
  --green-wash: #EDF4EF;
  --coral: #E67E6B;
  --coral-soft: #FBE7E1;
  --coral-deep: #B85240;
  --font-serif: Noto Serif JP, serif;
  --font-sans: Noto Sans JP, system-ui, sans-serif;
}

.learn-body {
  font-family: "Noto Sans JP", system-ui, sans-serif;
  font-size: 1.125rem;
  line-height: 1.85;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.learn-body h1, .learn-body h2, .learn-body h3, .learn-body h4 {
  font-family: "Noto Serif JP", serif;
  color: var(--ink);
  line-height: 1.45;
  font-weight: 600;
}
.learn-body h1 {
  font-size: 1.9rem;
  margin: 0 0 0.6em;
}
.learn-body h2 {
  font-size: 1.5rem;
  margin: 1.8em 0 0.5em;
}
.learn-body h3 {
  font-size: 1.25rem;
  margin: 1.6em 0 0.4em;
}
.learn-body p {
  margin: 0 0 1.3em;
}
.learn-body a {
  color: var(--green);
  text-underline-offset: 0.18em;
  text-decoration-thickness: from-font;
}
.learn-body a:hover {
  color: var(--olne);
}
.learn-body strong {
  font-weight: 700;
}

.site-measure {
  max-width: 44rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.learn-body .lead,
.learn-body .learn-summary {
  font-size: 1.18rem;
  color: var(--ink-soft);
  margin-bottom: 1.5em;
}

.learn-body .callout,
.learn-body blockquote {
  margin: 1.8em 0;
  padding: 1.1em 1.3em;
  background: var(--wash);
  border-left: 3px solid var(--green);
  border-radius: 0 10px 10px 0;
  color: var(--ink-soft);
}

.learn-body blockquote p:last-child {
  margin-bottom: 0;
}

.tag-new {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  background: var(--coral);
  border-radius: 999px;
  padding: 0.15em 0.7em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

@supports (backdrop-filter: blur(8px)) or (-webkit-backdrop-filter: blur(8px)) {
  .site-header {
    background: color-mix(in srgb, var(--paper) 82%, transparent);
    -webkit-backdrop-filter: saturate(1.1) blur(10px);
    backdrop-filter: saturate(1.1) blur(10px);
  }
}
.site-header.is-scrolled {
  box-shadow: 0 2px 12px rgba(42, 48, 45, 0.08);
}

.site-header__in {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1.25rem;
  min-height: 60px;
}

.site-header__spacer {
  flex: 1;
}

.site-brand {
  display: inline-flex;
  align-items: center;
}

.site-brand img {
  display: block;
  height: 30px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__group {
  position: relative;
}

.site-nav__toggle,
.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  min-height: 44px;
  padding: 0 0.8rem;
  font-family: "Noto Sans JP", system-ui, sans-serif;
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  background: none;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
}

.site-nav__toggle:hover,
.site-nav__link:hover {
  color: var(--green);
  background: var(--green-wash);
}

.site-nav__caret {
  transition: transform 0.18s ease;
  font-size: 0.8em;
}

.site-nav__toggle[aria-expanded=true] .site-nav__caret {
  transform: rotate(180deg);
}

.site-dd {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 280px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 12px 30px rgba(42, 48, 45, 0.12);
  padding: 0.4rem;
  display: grid;
  gap: 2px;
}

.site-dd[hidden] {
  display: none;
}

.site-dd a {
  display: block;
  min-height: 44px;
  padding: 0.5rem 0.7rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--ink);
}

.site-dd a:hover {
  background: var(--green-wash);
}

.site-dd a b {
  display: block;
  font-weight: 600;
  color: var(--green);
}

.site-dd a small {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
}

.site-search {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.site-search[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-olne {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 1.1rem;
  font-family: "Noto Sans JP", system-ui, sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--olne);
  border: 0;
  border-radius: 10px;
  text-decoration: none;
  cursor: pointer;
  transition: filter 0.15s ease;
}

.btn-olne:hover {
  filter: brightness(0.96);
}

.site-burger {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
}

.site-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

.site-mobile {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: var(--paper);
  padding: 5rem 1.5rem 2rem;
  overflow-y: auto;
}

.site-mobile[hidden] {
  display: none;
}

.site-mobile__heading {
  font-family: "Noto Serif JP", serif;
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0 0 0.5rem;
}

.site-mobile__cats {
  display: grid;
  gap: 2px;
  margin-bottom: 1.5rem;
}

.site-mobile__cats a,
.site-mobile__link {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 0 0.5rem;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.site-mobile__cats a {
  color: var(--green);
  font-weight: 600;
}

.site-mobile__store {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.site-mobile__store img {
  display: block;
  height: 44px;
  width: auto;
}

body.site-menu-open {
  overflow: hidden;
}

.site-footer {
  background: var(--wash);
  border-top: 1px solid var(--line);
  margin-top: 4rem;
}

.site-footer__in {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  align-items: center;
  text-align: center;
}

.site-footer__brand {
  font-family: "Noto Serif JP", serif;
  font-size: 1.2rem;
  color: var(--ink);
}

.site-footer__brand span {
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem 1.2rem;
}

.site-footer__links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink-soft);
  font-size: 0.95rem;
  text-decoration: none;
}

.site-footer__links a:hover {
  color: var(--green);
  text-decoration: underline;
}

.site-footer__store {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
}

.site-footer__store img {
  display: block;
  height: 40px;
  width: auto;
}

.site-footer__copyright {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0;
}

@media (max-width: 899px) {
  .site-nav {
    display: none;
  }
  .site-burger {
    display: flex;
  }
}
@media (min-width: 900px) {
  .site-mobile {
    display: none !important;
  }
}
@media (max-width: 375px) {
  .site-header__in {
    gap: 0.5rem;
    padding: 0.4rem 0.9rem;
  }
  .site-brand img {
    height: 26px;
  }
  .site-mobile {
    padding-inline: 1.1rem;
  }
}
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .site-nav__caret,
  .btn-olne {
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}
.learn-article-main {
  padding: 2rem 0 1rem;
}

.learn-article > * {
  margin-inline: auto;
}

.art-crumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.8em;
}

.art-crumb a {
  color: var(--green);
  text-decoration: none;
}

.art-crumb span {
  margin: 0 0.4em;
}

.art-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  margin-bottom: 0.6em;
}

.art-cat {
  color: var(--green);
  font-weight: 700;
  font-size: 0.85rem;
}

.art-audio-badge {
  font-size: 0.75rem;
  color: var(--green);
  background: var(--green-wash);
  border: 1px solid color-mix(in srgb, var(--green) 30%, transparent);
  border-radius: 999px;
  padding: 0.1em 0.7em;
}

.learn-article h1 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  margin: 0.2em 0 0.5em;
}

.art-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3em 1em;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0.4em 0 1em;
}

.art-author {
  font-weight: 600;
  color: var(--ink);
}

.art-review {
  font-size: 0.85rem;
  color: var(--ink-soft);
  background: var(--green-wash);
  border-radius: 8px;
  padding: 0.5em 0.8em;
  margin: 0 0 1.2em;
}

.art-review a {
  color: var(--green);
}

.art-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em;
  margin: 1.2em 0 1.6em;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  min-height: 44px;
  padding: 0 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font-family: "Noto Sans JP", system-ui, sans-serif;
  font-size: 1rem;
  cursor: pointer;
}

.btn-ghost:hover {
  border-color: var(--green);
}

.art-heart {
  color: var(--coral);
}

.art-toc {
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.1em 1.3em;
  margin: 1.6em 0;
}

.art-toc__h {
  font-family: "Noto Serif JP", serif;
  font-weight: 600;
  margin: 0 0 0.5em;
}

.art-toc ol {
  margin: 0;
  padding-left: 1.3em;
}

.art-toc li {
  margin: 0.3em 0;
}

.art-toc a {
  color: var(--green);
}

.art-body {
  margin-top: 1.4em;
}

.learn-article h1,
.art-body,
.art-refs {
  overflow-wrap: anywhere;
}

.learn-figure {
  margin: 1.8em 0;
}

.learn-figure img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  display: block;
}

.learn-table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.6em 0;
  font-size: 0.95em;
}

.learn-table th, .learn-table td {
  border: 1px solid var(--line);
  padding: 0.55em 0.8em;
  text-align: left;
}

.learn-table th {
  background: var(--green-wash);
  font-weight: 600;
}

.art-disclaimer {
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  margin-top: 2em;
  padding-top: 1em;
  line-height: 1.8;
}

.art-teaser {
  margin: 0 0 1.6em;
}

.art-gate {
  margin: 1.6em 0 2.4em;
}

.art-gate__card {
  background: var(--green-wash);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.8em 1.4em;
  text-align: center;
}

.art-gate__h {
  font-family: "Noto Serif JP", serif;
  font-size: 1.25rem;
  margin: 0 0 0.6em;
  color: var(--ink);
}

.art-gate__lead {
  color: var(--ink-soft);
  margin: 0 auto 1.2em;
  max-width: 34rem;
  line-height: 1.85;
}

.art-gate__pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  justify-content: center;
  margin: 0 0 1.4em;
}

.art-gate__pills span {
  font-size: 0.82rem;
  color: var(--green);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3em 0.9em;
}

.art-gate__cta {
  margin: 0 auto 1.1em;
}

.art-gate__store {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8em;
  justify-content: center;
}

.art-gate__store img {
  height: 44px;
  width: auto;
  display: block;
}

.art-bridge {
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.6em 1.4em;
  margin: 2.4em 0;
  text-align: center;
}

.art-bridge__tagline {
  font-family: "Noto Serif JP", serif;
  font-size: 1.15rem;
  line-height: 1.7;
  margin: 0 0 1em;
  color: var(--ink);
}

.art-bridge__logo {
  height: 34px;
  width: auto;
  display: block;
  margin: 0 auto 1em;
}

.art-bridge__lead {
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.9;
  max-width: 34rem;
  margin: 0 auto 1.4em;
}

.art-bridge__store {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8em;
  justify-content: center;
}

.art-bridge__store img {
  height: 44px;
  width: auto;
  display: block;
}

.art-supervisor {
  display: flex;
  gap: 1em;
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.2em;
  margin: 1.6em 0;
}

.art-supervisor__photo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  flex: none;
}

.art-supervisor__role {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--green);
  margin: 0 0 0.2em;
}

.art-supervisor__name {
  font-weight: 700;
  margin: 0;
}

.art-supervisor__affil {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0.1em 0;
}

.art-supervisor__bio {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.3em 0 0;
}

.art-refs {
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.1em 1.3em;
  margin: 1.6em 0;
}

.art-refs__h {
  font-weight: 700;
  margin: 0 0 0.4em;
}

.art-refs__list {
  margin: 0 0 0.6em;
  padding-left: 1.2em;
}

.art-refs__list a {
  color: var(--green);
}

.art-refs__meta {
  color: var(--muted);
  font-size: 0.85rem;
}

.art-refs__dates {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0;
}

.art-series {
  margin: 1.8em 0;
}

.art-series__h {
  font-weight: 700;
  margin: 0 0 0.6em;
}

.art-series__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8em;
}

.art-series__btn {
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7em 0.9em;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  min-height: 44px;
}

.art-series__btn:hover {
  border-color: var(--green);
}

.art-series__btn span {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
}

.art-series__btn b {
  font-size: 0.92rem;
}

.art-series__btn--empty {
  border: 0;
  background: none;
}

.art-related {
  margin: 2.4em 0 1em;
}

.art-related__h {
  font-family: "Noto Serif JP", serif;
  font-size: 1.2rem;
  margin: 0 0 0.8em;
}

.art-related__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1em;
}

.art-related__card {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
  padding: 1em;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
}

.art-related__card:hover {
  border-color: var(--green);
}

.art-related__cat {
  font-size: 0.75rem;
  color: var(--green);
  font-weight: 700;
}

.art-related__date {
  font-size: 0.78rem;
  color: var(--muted);
}

.art-gate__card {
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.4em;
  text-align: center;
  color: var(--ink-soft);
}

@media (max-width: 680px) {
  .learn-body {
    font-size: 1.0625rem;
  }
  .art-related__grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 480px) {
  .art-series__row {
    grid-template-columns: 1fr;
  }
}