* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body,
h1,
h2,
h3,
p {
  margin-top: 0;
}

body {
  margin-inline: 0;
  margin-bottom: 0;
}

a {
  color: inherit;
}

:root {
  --color-ink: #20242a;
  --color-paper: #ffffff;
  --color-accent: #315f7d;
  --color-green: #315f7d;
  --color-line: rgba(32, 36, 42, 0.18);
  --color-muted: rgba(32, 36, 42, 0.62);
  --content-width: 1120px;
  --font-sans: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  --font-serif: "Yu Mincho", "Hiragino Mincho ProN", serif;
  --font-mono: "SFMono-Regular", Consolas, monospace;
}

body {
  color: var(--color-ink);
  background: var(--color-paper);
  font-family: var(--font-sans);
  line-height: 1.8;
}

h1 {
  max-width: 900px;
  margin-bottom: 24px;
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h3 {
  line-height: 1.4;
}

strong {
  font-weight: 750;
}

.eyebrow,
.section-label {
  margin: 0 0 18px;
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.section-index {
  margin: 0 0 12px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}
.button:hover {
  transform: translateY(-2px);
}
.button-primary {
  color: var(--color-paper);
  background: var(--color-ink);
}
.button-secondary:hover {
  color: var(--color-paper);
  background: var(--color-ink);
}
.button-light {
  color: var(--color-ink);
  background: var(--color-paper);
  border-color: var(--color-paper);
}

@media (prefers-reduced-motion: reduce) {
  .button {
    transition: none;
  }
}
.record-list,
.publication-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.record-list li,
.publication-list li {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 28px;
  padding-block: 22px;
  border-top: 1px solid var(--color-line);
}
.record-list time,
.record-list .date-range,
.publication-list time,
.publication-list .date-range {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}
.record-list .date-range time,
.publication-list .date-range time {
  color: inherit;
  font-size: inherit;
}
.record-list p,
.publication-list p {
  margin: 0;
}
.record-list .publication-details,
.publication-list .publication-details {
  display: grid;
  gap: 4px;
  line-height: 1.4;
}
.record-list .publication-details h3,
.publication-list .publication-details h3 {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
}
.record-list .publication-authors,
.publication-list .publication-authors {
  font-size: 0.9rem;
}
.record-list .publication-venue,
.publication-list .publication-venue {
  color: var(--color-muted);
  font-size: 0.7rem;
}

@media (max-width: 720px) {
  .record-list li,
  .publication-list li {
    grid-template-columns: 1fr;
    gap: 5px;
  }
}
.site-header {
  width: min(100% - 40px, var(--content-width));
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-inline: auto;
  border-bottom: 1px solid var(--color-line);
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: baseline;
  color: inherit;
  font-weight: 700;
  text-decoration: none;
}

.brand-name-en {
  color: var(--color-muted);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.site-navigation {
  display: flex;
  gap: 28px;
  font-size: 0.9rem;
}
.site-navigation a {
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}
.site-navigation a[aria-current=page] {
  color: var(--color-accent);
  font-weight: 700;
  text-decoration-thickness: 2px;
}

.menu-button {
  display: none;
  padding: 8px 12px;
  color: inherit;
  background: transparent;
  border: 1px solid var(--color-line);
  border-radius: 3px;
  font: inherit;
}

@media (max-width: 720px) {
  .site-header {
    min-height: 72px;
    position: relative;
  }
  .menu-button {
    display: block;
  }
  .brand-name-en {
    display: none;
  }
  .site-navigation {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    z-index: 10;
    min-width: 220px;
    flex-direction: column;
    gap: 0;
    padding: 10px;
    background: var(--color-paper);
    border: 1px solid var(--color-line);
    border-radius: 3px;
    box-shadow: 0 8px 18px rgba(32, 36, 42, 0.1);
  }
  .site-navigation.is-open {
    display: flex;
  }
  .site-navigation a {
    padding: 10px;
  }
}
.hero {
  width: min(100% - 40px, var(--content-width));
  margin-inline: auto;
}

.researcher-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: clamp(48px, 7vw, 90px);
  align-items: start;
  padding-block: clamp(64px, 9vw, 100px);
}

.hero-main h1 {
  margin-bottom: 6px;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.hero-main .button {
  margin-top: 20px;
}

.name-en {
  margin-bottom: 32px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.08em;
}

.affiliation {
  font-size: 1.08rem;
}

.researcher-summary {
  margin: 0;
}
.researcher-summary div + div {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
}
.researcher-summary dt {
  margin-bottom: 6px;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 700;
}
.researcher-summary dd {
  margin: 0;
  font-size: 0.93rem;
}

.email-address {
  white-space: nowrap;
}

.email-at {
  width: 1em;
  height: 1em;
  vertical-align: -0.14em;
  margin-inline: 0.04em;
  mix-blend-mode: multiply;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.profile-links a {
  color: var(--color-ink);
  font-size: 0.82rem;
  font-weight: 600;
  text-underline-offset: 0.25em;
}

@media (max-width: 720px) {
  .researcher-hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 50px;
    padding-block: 72px;
  }
}
.section {
  width: min(100% - 40px, var(--content-width));
  display: grid;
  grid-template-columns: minmax(150px, 0.5fr) minmax(0, 1.5fr);
  gap: clamp(40px, 7vw, 90px);
  margin-inline: auto;
  padding-block: 76px;
  border-top: 1px solid var(--color-line);
  scroll-margin-top: 20px;
}

.section-heading h2 {
  margin-bottom: 0;
  font-family: var(--font-sans);
  font-size: clamp(1.8rem, 3.5vw, 3.2rem);
  font-weight: 600;
}

.section-body {
  min-width: 0;
}

.lead {
  margin-bottom: 44px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.topic-list article {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 16px;
  padding-block: 24px;
  border-top: 1px solid var(--color-line);
}
.topic-list span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.topic-list h3 {
  margin-bottom: 7px;
  font-size: 1.15rem;
}
.topic-list p {
  margin: 0;
  color: var(--color-muted);
}

.text-link {
  display: inline-flex;
  gap: 10px;
  margin-top: 30px;
  font-weight: 700;
  text-underline-offset: 6px;
}

.news-section {
  margin-bottom: 50px;
}

.profile-data {
  margin: 0;
}
.profile-data div {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 28px;
  padding-block: 20px;
  border-top: 1px solid var(--color-line);
}
.profile-data dt {
  color: var(--color-muted);
  font-size: 0.85rem;
}
.profile-data dd {
  margin: 0;
}

.detail-section,
.publication-section {
  padding-block: 60px;
}

.publication-section {
  grid-template-columns: 1fr;
  gap: 24px;
  padding-block: 40px;
}
.publication-section .section-heading h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
}

.publication-sections {
  padding-bottom: 50px;
}

.publication-section:last-child {
  border-bottom: 1px solid var(--color-line);
}

@media (max-width: 720px) {
  .section {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-block: 72px;
  }
  .detail-section,
  .publication-section {
    padding-block: 56px;
  }
  .publication-section {
    gap: 20px;
    padding-block: 36px;
  }
  .profile-data div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}
.blog-index {
  width: min(100% - 40px, var(--content-width));
  margin-inline: auto;
  padding-top: 32px;
  padding-bottom: 100px;
}

.blog-index-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-line);
}
.blog-index-heading h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(1.8rem, 3.5vw, 3.2rem);
  font-weight: 600;
}
.blog-index-heading .section-index {
  margin: 0 0 8px;
  order: 2;
}

.blog-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.blog-list > li {
  border-bottom: 1px solid var(--color-line);
}

.blog-card {
  display: grid;
  grid-template-columns: minmax(130px, 0.38fr) minmax(0, 1.62fr);
  grid-template-areas: "meta title" "meta description";
  gap: 8px clamp(28px, 5vw, 72px);
  align-items: center;
  padding-block: clamp(32px, 5vw, 54px);
}
.blog-card h3 {
  grid-area: title;
  margin: 0;
  font-size: clamp(1.25rem, 2.5vw, 1.8rem);
}
.blog-card h3 a {
  text-decoration-thickness: 1px;
  text-decoration-color: transparent;
  text-underline-offset: 0.25em;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}
.blog-card h3 a:hover {
  color: var(--color-accent);
  text-decoration-color: currentColor;
}
.blog-card > p {
  grid-area: description;
  margin: 0;
  color: var(--color-muted);
}

.blog-card-meta {
  grid-area: meta;
  align-self: start;
}
.blog-card-meta time {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}
.category-tags li {
  color: var(--color-muted);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 0.72rem;
  line-height: 1.5;
}
.category-tags a {
  display: block;
  padding: 3px 9px;
  color: inherit;
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}
.category-tags li:has(a):hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.category-navigation {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-block: 20px;
  border-bottom: 1px solid var(--color-line);
  font-size: 0.82rem;
}
.category-navigation > span {
  flex: none;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-weight: 700;
}
.category-navigation ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.category-navigation a {
  font-weight: 700;
  text-underline-offset: 0.25em;
}
.category-navigation a span {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.blog-empty {
  padding-block: 48px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
}

.blog-post {
  width: min(100% - 40px, 860px);
  margin-inline: auto;
  padding-block: clamp(64px, 9vw, 120px) 100px;
}

.post-header {
  padding-bottom: clamp(24px, 4vw, 36px);
}
.post-header h1 {
  margin-bottom: 28px;
  font-family: var(--font-sans);
  font-size: clamp(1.9rem, 4.5vw, 3.5rem);
  font-weight: 500;
  line-height: 1.35;
}

.post-back-link {
  display: inline-block;
  margin-bottom: 36px;
  color: var(--color-muted);
  font-size: 0.85rem;
  font-weight: 700;
  text-underline-offset: 0.3em;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 18px;
}
.post-meta time {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
}
.post-meta .category-tags {
  margin: 0;
}

.post-content {
  padding: clamp(24px, 4vw, 40px) 0 clamp(48px, 8vw, 84px);
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  line-height: 2;
}
.post-content strong {
  font-family: var(--font-sans);
  font-weight: 600;
}
.post-content > * {
  max-width: 52rem;
  margin-inline: auto;
}
.post-content h2,
.post-content h3 {
  font-family: var(--font-sans);
}
.post-content h2 {
  margin-top: 3.2em;
  margin-bottom: 0.9em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--color-line);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
}
.post-content h3 {
  margin-top: 2.6em;
  margin-bottom: 0.7em;
  font-size: clamp(1.2rem, 2vw, 1.45rem);
}
.post-content p,
.post-content ul,
.post-content ol,
.post-content blockquote,
.post-content .callout,
.post-content pre {
  margin-top: 0;
  margin-bottom: 1.7em;
}
.post-content .math-display {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  margin-top: 0;
  margin-bottom: 1.7em;
}
.post-content .math-display > span {
  display: block;
}
.post-content .math-display .katex-display {
  margin: 0;
}
.post-content a {
  color: var(--color-accent);
  text-underline-offset: 0.22em;
}
.post-content blockquote {
  padding: 18px 24px;
  border-left: 4px solid rgba(23, 33, 27, 0.42);
  background: rgba(23, 33, 27, 0.06);
}
.post-content blockquote > :last-child,
.post-content .callout > :last-child {
  margin-bottom: 0;
}
.post-content .callout {
  --callout-color: rgba(23, 33, 27, 0.42);
  --callout-background: rgba(23, 33, 27, 0.06);
  padding: 18px 24px;
  border-left: 4px solid var(--callout-color);
  background: var(--callout-background);
}
.post-content .callout--important {
  --callout-color: #b84036;
  --callout-background: rgba(184, 64, 54, 0.09);
}
.post-content .callout--supplementary {
  --callout-color: #2d6f9f;
  --callout-background: rgba(45, 111, 159, 0.09);
}
.post-content code {
  padding: 0.12em 0.35em;
  background: rgba(23, 33, 27, 0.08);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88em;
}
.post-content pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 22px 24px;
  color: var(--color-paper);
  background: var(--color-ink);
  border-radius: 10px;
  line-height: 1.65;
}
.post-content pre code {
  padding: 0;
  color: inherit;
  background: transparent;
}
.post-content .post-figure {
  display: grid;
  justify-items: center;
  margin-top: 0;
  margin-bottom: 1.7em;
}
.post-content .post-figure img {
  display: block;
  max-width: 100%;
  height: auto;
}
.post-content .post-figure figcaption {
  margin-top: 0.65em;
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 0.82em;
  line-height: 1.65;
  text-align: center;
}
.post-content hr {
  margin-block: 2.8em;
  border: 0;
  border-top: 1px solid var(--color-line);
}

.post-footer {
  padding-top: 32px;
  border-top: 1px solid var(--color-line);
}
.post-footer .text-link {
  margin-top: 0;
}

@media (max-width: 720px) {
  .blog-index {
    padding-bottom: 72px;
  }
  .blog-card {
    grid-template-columns: 1fr;
    grid-template-areas: "meta" "title" "description";
    gap: 12px;
  }
  .post-meta {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .blog-card h3 a {
    transition: none;
  }
}
.site-footer {
  width: min(100% - 40px, var(--content-width));
  min-height: 110px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-inline: auto;
  font-size: 0.85rem;
}
.site-footer p {
  margin: 0;
}
.site-footer a {
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

@media (max-width: 720px) {
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
  }
}