@charset "UTF-8";

:root {
  color-scheme: light;
  --color-ink: #172533;
  --color-muted: #586674;
  --color-primary: #163f63;
  --color-accent: #2d718f;
  --color-link: #145f91;
  --color-line: #d8e0e6;
  --color-soft: #f3f6f8;
  --color-surface: #ffffff;
  --content-width: 920px;
  --header-width: 1120px;
  --reading-width: 72ch;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    Arial, "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-padding-top: 2rem;
}

body {
  margin: 0;
  color: var(--color-ink);
  background: var(--color-surface);
  overflow-wrap: break-word;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  max-width: 100%;
}

img {
  height: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.65rem 1rem;
  color: #fff;
  background: var(--color-primary);
  border-radius: 0.25rem;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

header {
  width: 100%;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  width: min(100% - 3rem, var(--header-width));
  min-height: 4.5rem;
  margin-inline: auto;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.site-name {
  flex: 0 0 auto;
  color: var(--color-primary);
  font-size: 1.05rem;
  font-weight: 750;
  letter-spacing: 0.02em;
  line-height: 1.35;
  text-decoration: none;
}

.site-name span {
  display: block;
  margin-top: 0.08rem;
  color: var(--color-muted);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.primary-nav {
  min-width: 0;
  margin-left: auto;
}

.primary-nav ul,
.section-nav ul,
.profile-links,
.quick-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.primary-nav li,
.section-nav li,
.profile-links li,
.quick-links li {
  margin: 0;
  padding: 0;
}

.primary-nav a {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.55rem 0.75rem;
  color: #3f5060;
  border-radius: 0.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
}

.primary-nav a:hover {
  color: var(--color-primary);
  background: var(--color-soft);
}

.primary-nav a[aria-current="page"] {
  color: var(--color-primary);
  background: #e9f0f4;
}

main {
  width: min(100% - 3rem, var(--content-width));
  min-height: 65vh;
  margin-inline: auto;
  padding-block: clamp(2.75rem, 6vw, 4.5rem) 5rem;
}

h1,
h2,
h3 {
  color: var(--color-primary);
  font-family: inherit;
  line-height: 1.35;
  text-wrap: balance;
}

h1 {
  margin: 0 0 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-primary);
  font-size: clamp(2rem, 5vw, 2.7rem);
  font-weight: 720;
  letter-spacing: 0.005em;
}

h2 {
  margin: 3.75rem 0 1.25rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--color-line);
  font-size: clamp(1.35rem, 3vw, 1.62rem);
  font-weight: 700;
}

h3 {
  margin: 2.25rem 0 0.9rem;
  padding-left: 0.8rem;
  border-left: 3px solid var(--color-accent);
  font-size: clamp(1.08rem, 2.5vw, 1.24rem);
  font-weight: 700;
}

p {
  max-width: var(--reading-width);
  margin-block: 0 1.35rem;
}

.page-intro {
  max-width: 68ch;
  margin: 0 0 2.25rem;
  color: #415262;
  font-size: clamp(1.02rem, 2vw, 1.1rem);
  line-height: 1.8;
}

ul,
ol {
  margin-block: 1rem 1.75rem;
  padding-left: 1.6rem;
}

li {
  margin-block: 0.55rem;
  padding-left: 0.2rem;
}

li::marker {
  color: var(--color-accent);
  font-weight: 650;
}

a {
  color: var(--color-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: #0c4266;
  text-decoration-thickness: 2px;
}

a:focus-visible {
  outline: 3px solid #8a5a00;
  outline-offset: 3px;
  border-radius: 2px;
}

.language-link {
  display: inline-flex;
  min-width: 2.75rem;
  min-height: 2.75rem;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  font-size: 0.82rem;
  font-weight: 650;
  white-space: nowrap;
}

:target {
  scroll-margin-top: 2rem;
}

.section-nav {
  margin: 0 0 3rem;
  padding-block: 0.9rem;
  border-block: 1px solid var(--color-line);
}

.section-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.5rem;
}

.section-nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding-block: 0.45rem;
  font-size: 0.92rem;
  font-weight: 600;
}

.section-nav a::after,
.quick-links a::after {
  display: inline-block;
  margin-left: 0.35em;
  content: "↓";
  text-decoration: none;
}

.section-nav a[href$=".html"]::after,
.quick-links a[href$=".html"]::after {
  content: "→";
}

.profile-layout {
  display: grid;
  grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
  align-items: start;
  gap: clamp(2rem, 6vw, 4rem);
  margin-top: 2.75rem;
}

.profile-photo {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center;
  border: 1px solid var(--color-line);
  border-radius: 0.3rem;
  background: var(--color-soft);
}

.profile-content {
  min-width: 0;
}

.profile-role {
  margin-bottom: 0.75rem;
  color: var(--color-primary);
  font-size: 1.08rem;
  font-weight: 700;
}

.profile-summary {
  margin-bottom: 1.75rem;
  color: #344555;
}

.contact-details {
  margin-block: 0 1.75rem;
  color: #415262;
  font-style: normal;
  line-height: 1.9;
}

.contact-details .contact-label {
  display: inline-block;
  min-width: 4.5rem;
  color: var(--color-muted);
  font-size: 0.88rem;
  font-weight: 650;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-bottom: 1.75rem;
}

.profile-links a,
.quick-links a {
  font-weight: 600;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-line);
}

.research-figure {
  width: min(100%, 760px);
  margin: 1.5rem auto 2rem;
}

@media (min-width: 801px) {
  .research-figure {
    width: min(100%, 680px);
  }
}

.research-figure picture,
.research-image {
  display: block;
}

.research-image {
  width: 100%;
  border: 1px solid var(--color-line);
  border-radius: 0.3rem;
  background: var(--color-soft);
}

.research-figure figcaption {
  margin-top: 0.5rem;
  color: var(--color-muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.page-highlight main {
  width: min(100% - 3rem, 760px);
}

.highlight-kicker {
  margin-bottom: 0.6rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.highlight-lead {
  color: var(--color-primary);
  font-size: 1.08rem;
  line-height: 1.7;
}

.research-note h2 {
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.35rem;
  font-size: clamp(1.16rem, 2.5vw, 1.3rem);
}

.highlight-visual {
  width: min(100%, 680px);
  margin: 2rem 0 2.5rem;
}

.highlight-visual img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--color-line);
  background: var(--color-soft);
}

.highlight-visual figcaption {
  margin-top: 0.55rem;
  color: var(--color-muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.paper-source {
  margin-top: 0;
}

.paper-source p {
  margin-bottom: 0.75rem;
  color: #415262;
  font-size: 0.94rem;
}

.research-link-list {
  padding-left: 1.3rem;
}

.research-link-list li + li {
  margin-top: 0.45rem;
}

.related-highlights {
  margin-top: 0;
}

.research-link-list span {
  color: var(--color-muted);
  font-size: 0.88rem;
}

.research-keywords,
.related-papers {
  color: #415262;
}

.reference-list {
  max-width: 82ch;
  margin-top: 1.5rem;
  font-size: 0.94rem;
}

.author-name {
  font-weight: 750;
}

.page-outputs main > section > ol > li,
.page-biography main > section > ol > li {
  margin: 0;
  padding-block: 0.85rem;
  border-bottom: 1px solid #e6ebee;
  font-variant-numeric: tabular-nums;
}

.page-outputs main > section > ol,
.page-biography main > section > ol {
  padding-left: 1.75rem;
}

.thesis-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 3rem;
  margin-top: 1.5rem;
}

.thesis-list h3 {
  margin-top: 0;
}

.thesis-list p {
  margin-bottom: 0.5rem;
}

.link-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem 4rem;
}

.link-group {
  min-width: 0;
}

.link-group h2 {
  margin-top: 2.75rem;
}

.link-group ul {
  padding-left: 1.25rem;
}

.link-group li {
  margin-block: 0.35rem;
}

.link-group a {
  overflow-wrap: anywhere;
}

.language-switcher {
  width: min(100% - 3rem, var(--content-width));
  margin: 0 auto;
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 0.9rem;
  text-align: right;
}

.language-switcher a[aria-current="page"] {
  color: var(--color-ink);
  font-weight: 700;
  text-decoration: none;
}

.simple-page {
  max-width: 680px;
  min-height: 70vh;
  padding-top: 5rem;
}

@media (max-width: 800px) {
  .header-inner {
    position: relative;
    display: block;
    width: 100%;
    padding-top: 0.85rem;
  }

  .site-name {
    display: inline-block;
    margin-inline: 1.25rem;
  }

  .primary-nav {
    margin-top: 0.65rem;
    margin-left: 0;
    border-top: 1px solid #edf0f2;
  }

  .primary-nav ul {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    width: 100%;
    padding: 0.45rem 0.75rem;
  }

  .primary-nav a {
    display: flex;
    min-height: 2.75rem;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0.15rem;
    font-size: clamp(0.7rem, 2.9vw, 0.8rem);
    letter-spacing: -0.015em;
    text-align: center;
  }

  .language-link {
    position: absolute;
    top: 0.55rem;
    right: 0.85rem;
  }

  main {
    width: min(100% - 2.5rem, var(--content-width));
    padding-block: 2.5rem 4rem;
  }

  .profile-layout {
    grid-template-columns: minmax(180px, 210px) minmax(0, 1fr);
    gap: clamp(1.75rem, 5vw, 3rem);
    margin-top: 2.25rem;
  }

  .profile-photo {
    width: 100%;
  }

  .link-groups,
  .thesis-list {
    grid-template-columns: 1fr;
  }

  .language-switcher {
    width: min(100% - 2.5rem, var(--content-width));
  }
}

@media (max-width: 520px) {
  html[lang="en"] .primary-nav ul {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .profile-layout {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .profile-photo {
    width: min(62vw, 210px);
  }
}

@media (max-width: 420px) {
  main,
  .language-switcher {
    width: min(100% - 2rem, var(--content-width));
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    margin-top: 3.1rem;
  }

  ul,
  ol {
    padding-left: 1.35rem;
  }

  .contact-details .contact-label {
    display: block;
  }
}

@media (forced-colors: active) {
  .primary-nav a[aria-current="page"] {
    border: 2px solid currentColor;
  }
}

@media print {
  header,
  .language-switcher,
  .skip-link,
  .section-nav,
  .quick-links {
    display: none;
  }

  main {
    width: 100%;
    padding: 0;
  }

  a {
    color: inherit;
  }
}