:root {
  --primary: #2c3e50;
  --accent: #f05491;
  --background: #eef6fb;
  --surface: #ffffff;
  --text: #333333;
  --muted: #666666;
  --shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Noto Serif JP", "Hiragino Kaku Gothic ProN", Arial, sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
}

strong,
b {
  font-weight: 700;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--primary);
  color: #ffffff;
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
}

.site-header {
  background: rgba(173, 216, 230, 0.9);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  margin-bottom: 2rem;
}

.nav {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem;
  row-gap: 0.75rem;
}

.nav-left {
  display: flex;
  align-items: center;
  justify-self: start;
}

.nav-center {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.nav-right {
  display: flex;
  justify-self: end;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  flex-wrap: wrap;
  min-width: 0;
}

.nav-list a {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  padding-bottom: 0.2rem;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  text-decoration: none;
  border-bottom: 2px solid var(--primary);
  outline: none;
}

.nav-list a[aria-current="page"] {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
}

.lang-switch {
  border: 1px solid rgba(44, 62, 80, 0.2);
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-size: 0.85rem;
  transition: color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
  max-width: 12rem;
  text-align: center;
}

.lang-switch:hover,
.lang-switch:focus {
  color: var(--primary);
  border-color: var(--primary);
}

.lang-switch.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}


@media (max-width: 900px) {
  .nav {
    grid-template-columns: minmax(0, 1fr);
    text-align: center;
  }
  .nav-left {
    justify-content: center;
  }
  .nav-right {
    justify-content: center;
  }
  .lang-switch {
    width: auto;
  }
}

@media (max-width: 600px) {
  .nav {
    grid-template-columns: minmax(0, 1fr);
  }
  .nav-center {
    flex-direction: column;
    gap: 0.75rem;
  }
  .nav-right {
    justify-content: center;
  }
  .lang-switch {
    width: 100%;
    max-width: none;
  }
}


.page-intro {
  margin-bottom: 2.5rem;
  text-align: center;
}

.page-intro h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin-bottom: 0.5rem;
}

.page-intro .lead {
  color: var(--muted);
  max-width: 60ch;
  margin: 0 auto;
}

.hero {
  background: var(--surface);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  align-items: center;
  margin-bottom: 2.5rem;
}

.hero-role {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button.primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 8px 16px rgba(44, 62, 80, 0.24);
}

.button.secondary {
  border: 1px solid var(--primary);
  color: var(--primary);
  background: #ffffff;
}

.button:hover,
.button:focus {
  transform: translateY(-2px);
}

.hero-photo img {
  border-radius: 50%;
  max-width: 220px;
  margin: 0 auto;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.18);
}

.stats {
  margin-bottom: 2.5rem;
}

.stats h2 {
  text-align: center;
  margin-bottom: 1.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-icon {
  font-size: 1.5rem;
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-right: 1rem;
}

.stat-label {
  color: var(--muted);
  font-size: 0.95rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1.25rem;
}

.section-header h2 {
  font-size: 1.75rem;
}

.view-all {
  font-size: 0.9rem;
}

.news,
.activity-block,
.bio,
.memberships,
.research-focus,
.quick-links {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2.5rem;
}

.news-list,
.activity-list {
  display: grid;
  gap: 1.5rem;
}

.news-item,
.activity-list article {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: minmax(90px, 120px) 1fr;
}

.news-item time,
.activity-list time {
  font-weight: 700;
  color: var(--muted);
}

.news-body h3,
.activity-list h3 {
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.meta {
  font-size: 0.95rem;
  color: var(--muted);
}

.inline-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.research-focus ul,
.quick-links ul,
.memberships ul {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.focus-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.focus-tags li {
  background: rgba(44, 62, 80, 0.1);
  color: var(--primary);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-size: 0.9rem;
}

.quick-links ul li a {
  color: var(--primary);
  font-weight: 600;
}

.bio dl {
  display: grid;
  grid-template-columns: 120px 1fr;
  row-gap: 0.75rem;
  column-gap: 1rem;
}

.bio dt {
  font-weight: 600;
  color: var(--muted);
}

.timeline ol {
  list-style: none;
  display: grid;
  gap: 1rem;
  counter-reset: timeline;
}

.timeline {
  margin-bottom: 2.5rem;
}

.timeline li {
  background: var(--surface);
  border-left: 3px solid var(--primary);
  padding: 1rem 1rem 1rem 1.5rem;
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}

.timeline time {
  font-weight: 700;
  color: var(--primary);
  margin-right: 1rem;
  display: block;
  margin-bottom: 0.5rem;
}

.publication {
  list-style: none;
  padding: 1rem 1.5rem;
  margin-bottom: 1rem;
  background: var(--surface);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.publication-title {
  display: block;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.publication-authors,
.publication-venue,
.publication-year {
  display: block;
  font-size: 0.95rem;
  color: var(--muted);
}

.publication-link {
  margin-top: 0.5rem;
  display: inline-block;
}

.site-footer {
  text-align: center;
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.85rem;
}


  .nav-left, .nav-center, .nav-right {
    justify-content: center;
  }

  .nav-list {
    width: 100%;
    justify-content: center;
    gap: 0.75rem;
  }

  .lang-switch {
    margin-left: 0;
  }

  .news-item,
  .activity-list article,
  .bio dl {
    grid-template-columns: 1fr;
  }

  .activity-list time,
  .activity-list h3,
  .activity-list .meta,
  .activity-list p,
  .activity-list .tag-list,
  .activity-list .inline-links {
    grid-column: 1;
  }

  .container {
    padding: 0 1rem 3rem;
  }


.bibliography {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.bibliography > li {
  list-style: none;
  margin: 0;
}

.publication-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.6rem 1.8rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.publication-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.5rem;
}

.publication-card header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.pub-year {
  font-weight: 700;
  color: var(--primary);
  margin-right: 1rem;
  margin: 0;
}

.pub-title {
  font-size: 1.02rem;
  margin: 0;
}

.publication-card p {
  margin: 0;
}

.publication-card p + p {
  margin-top: 0.3rem;
}

.pub-authors,
.pub-venue {
  color: var(--muted);
  font-size: 0.9rem;
}

.pub-note {
  color: var(--muted);
  font-size: 0.85rem;
}

.pub-link {
  font-weight: 600;
  margin-top: 0.3rem;
}

.activity-list {
  display: grid;
  gap: 1.5rem;
}

.activity-list article {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: minmax(80px, 120px) 1fr;
  gap: 0.4rem 1rem;
  align-items: start;
}

.activity-list time {
  font-weight: 700;
  color: var(--primary);
  margin-right: 1rem;
  grid-column: 1;
}

.activity-list h3,
.activity-list .meta,
.activity-summary,
.activity-list .tag-list,
.activity-list .inline-links {
  grid-column: 2;
}

.activity-summary p {
  margin: 0;
}

.activity-list h3 {
  margin: 0;
}

.activity-list .meta {
  font-size: 0.9rem;
  color: var(--muted);
}

.activity-list .inline-links {
  margin-top: 0.4rem;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
}

.tag-list li {
  background: rgba(44, 62, 80, 0.1);
  color: var(--primary);
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  font-size: 0.82rem;
}

.news-summary p,
.activity-summary p {
  margin: 0;
}

.news-summary p + p,
.activity-summary p + p {
  margin-top: 0.5rem;
}


  .nav-list {
    justify-content: center;
  }


  .nav-left {
    justify-content: center;
  }
  .nav-right {
    justify-content: center;
  }
  .nav-list {
    gap: 1rem;
  }


@media (min-width: 901px) {
  .nav {
    grid-template-columns: auto 1fr auto;
  }
}