:root {
  --bg: #ffffff;
  --paper: #ffffff;
  --ink: #1f2933;
  --muted: #5f6c7b;
  --line: #d9ded8;
  --accent: #2d5b4f;
  --accent-light: #f2f5f3;
  --link: #245c8d;
  --max-width: 760px;
  --body-size: 16px;
  --heading-size: 1.45rem;
}

* {
  box-sizing: border-box;
}

html {
  overflow-y: scroll;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Times New Roman", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", Meiryo, serif;
  font-size: var(--body-size);
  line-height: 1.75;
}

html[lang="en"] body {
  font-family: "Times New Roman", Times, serif;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

.container {
  width: min(100% - 40px, var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 246, 242, 0.94);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-title {
  display: inline-flex;
  flex-direction: column;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.2;
}

.name-ja {
  font-family: Arial, Helvetica, sans-serif;
  font-size: var(--body-size);
  font-weight: 700;
}

.name-en {
  color: var(--muted);
  font-size: var(--body-size);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  border-radius: 4px;
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  padding: 8px 12px;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--accent-light);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  padding: 9px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  border-bottom: 1px solid var(--line);
  padding: 64px 0 52px;
  background: var(--paper);
}

.hero-grid,
.profile-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.profile-hero {
  grid-template-columns: 1fr;
}

.english-profile-hero {
  grid-template-columns: 190px minmax(0, 1fr);
  align-items: center;
}

.profile-photo {
  width: 170px;
  aspect-ratio: 1;
  margin: 0;
}

.profile-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-intro {
  padding-left: 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.works-title-label,
.contact-title-label {
  font-family: Arial, Helvetica, sans-serif;
}

.works-page main h1,
.works-page main h2,
.works-page main h3 {
  font-family: "Times New Roman", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", Meiryo, serif;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.35;
  font-family: Arial, Helvetica, "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", Meiryo, sans-serif;
  font-weight: 600;
}

html[lang="en"] h1,
html[lang="en"] h2,
html[lang="en"] h3,
html[lang="en"] .name-ja,
html[lang="en"] .name-en {
  font-family: Arial, Helvetica, sans-serif;
}

h1 {
  font-size: var(--heading-size);
}

h2 {
  margin-bottom: 20px;
  font-size: var(--heading-size);
}

h3 {
  margin: 34px 0 14px;
  color: var(--accent);
  font-size: var(--heading-size);
}

.subheading {
  font-size: var(--body-size);
}

.lead {
  max-width: 680px;
  margin: 22px 0 0;
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.tag-list span {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  padding: 5px 10px;
  color: var(--muted);
}

.profile-note {
  border-left: 2px solid var(--line);
  padding-left: 18px;
  color: var(--muted);
}

.profile-note p {
  margin: 0 0 12px;
}

.section {
  padding: 64px 0;
}

.works-publications {
  padding-bottom: 28px;
}

.english-publications {
  padding-top: 28px;
  padding-bottom: 28px;
}

.english-contact {
  padding-top: 28px;
}

.works-presentations,
.works-other {
  padding-top: 28px;
}

.profile-sections {
  display: grid;
  gap: 42px;
}

.contact-sections {
  display: grid;
  gap: 42px;
}

.contact-sections .plain-list,
.contact-sections .link-list {
  padding-left: 0;
  list-style-position: inside;
}

.campus-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.campus-gallery figure {
  margin: 0;
}

.campus-gallery img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.campus-gallery figcaption {
  margin-top: 6px;
  color: var(--muted);
}

.section-muted {
  background: var(--paper);
}

.two-column,
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
}

.plain-list,
.link-list {
  margin: 0;
  padding-left: 1.2em;
}

.plain-list li,
.link-list li {
  margin-bottom: 10px;
}

.timeline {
  margin: 0;
}

.timeline div {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 20px;
  padding: 16px 0;
}

.timeline div:first-child {
  padding-top: 0;
}

.timeline dt {
  color: var(--accent);
  font-weight: 700;
}

.timeline dd {
  margin: 0;
}

.page-title {
  border-bottom: 1px solid var(--line);
  padding: 58px 0 44px;
  background: var(--paper);
}

.publication-list {
  margin: 0;
  padding-left: 1.4em;
}

.publication-list,
.publication-list cite,
.note,
.source-note {
  font-family: "Times New Roman", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", Meiryo, serif;
}

.publication-list li {
  margin-bottom: 18px;
  padding-left: 4px;
}

.publication-list p {
  margin: 0;
}

.note,
.source-note {
  color: var(--muted);
}

.contact-mail {
  font-size: var(--body-size);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  background: var(--paper);
  color: var(--muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, var(--max-width));
  }

  .header-inner {
    min-height: 64px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    right: 14px;
    left: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--paper);
    padding: 8px;
    box-shadow: 0 16px 32px rgba(31, 41, 51, 0.12);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 11px 12px;
  }

  .hero {
    padding: 56px 0 48px;
  }

  .hero-grid,
  .profile-hero,
  .two-column,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .profile-intro {
    padding-left: 0;
  }

  .profile-photo {
    width: 170px;
  }

  .section {
    padding: 48px 0;
  }

  .campus-gallery {
    grid-template-columns: 1fr;
  }

  .timeline div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
  }
}