:root {
  --background: #fdfdfc;
  --surface: #ffffff;
  --foreground: #202328;
  --muted: #676d76;
  --subtle: #8a9099;
  --line: #e2e4e7;
  --line-strong: #c9cdd2;
  --accent: #3154c8;
  --accent-soft: #f0f3ff;
  --header: rgba(253, 253, 252, 0.9);
  --font-body:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

html[data-theme="dark"] {
  --background: #151719;
  --surface: #1b1e21;
  --foreground: #f0f1f2;
  --muted: #a7abb2;
  --subtle: #838992;
  --line: #30343a;
  --line-strong: #484d55;
  --accent: #9aafff;
  --accent-soft: #21283f;
  --header: rgba(21, 23, 25, 0.9);
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  background: var(--background);
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  transition:
    background-color 180ms ease,
    color 180ms ease;
}

::selection {
  background: var(--accent);
  color: var(--background);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

a,
button {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.6rem 0.9rem;
  background: var(--foreground);
  color: var(--background);
  font-size: 0.78rem;
  transform: translateY(-180%);
  transition: transform 150ms ease;
}

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

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: var(--header);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.header-inner,
.page-shell,
.footer-inner {
  width: min(100% - 2.5rem, 900px);
  margin-inline: auto;
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 2rem;
  align-items: center;
  min-height: 4.5rem;
}

.brand {
  font-size: 0.88rem;
  font-weight: 680;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  gap: 1.45rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 560;
}

.site-nav a {
  position: relative;
  transition: color 150ms ease;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -0.28rem;
  left: 0;
  height: 1px;
  background: var(--foreground);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 150ms ease;
}

.site-nav a:hover {
  color: var(--foreground);
}

.site-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-actions {
  display: flex;
  gap: 0.45rem;
  align-items: center;
}

.language-toggle,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition:
    border-color 150ms ease,
    color 150ms ease;
}

.language-toggle:hover,
.theme-toggle:hover {
  border-color: var(--line-strong);
  color: var(--foreground);
}

.language-toggle {
  gap: 0.25rem;
  padding-inline: 0.62rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
}

.language-toggle .active {
  color: var(--foreground);
  font-weight: 700;
}

.theme-toggle {
  width: 2rem;
  border-radius: 50%;
  font-size: 0.9rem;
}

.intro {
  padding-block: clamp(5rem, 10vw, 7rem) clamp(4.5rem, 8vw, 6rem);
  border-bottom: 1px solid var(--line-strong);
}

.intro h1 {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
  align-items: baseline;
  margin: 0;
  font-size: clamp(2.45rem, 7vw, 4rem);
  font-weight: 580;
  letter-spacing: -0.055em;
  line-height: 1.04;
}

.intro h1 span {
  color: var(--muted);
  font-size: 0.36em;
  font-weight: 520;
  letter-spacing: 0.12em;
}

.role {
  margin: 1.5rem 0 0;
  font-size: 0.98rem;
  font-weight: 630;
}

.affiliation {
  margin: 0.18rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.intro-copy {
  max-width: 43rem;
  margin: 1.8rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.profile-links {
  display: grid;
  grid-template-columns: 1.45fr 1fr 0.85fr;
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.profile-links > a {
  position: relative;
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: center;
  min-width: 0;
  padding: 1rem;
  transition: background-color 150ms ease;
}

.profile-links > a + a {
  border-left: 1px solid var(--line);
}

.profile-links > a:hover {
  background: var(--accent-soft);
}

.profile-links > a:hover .link-arrow {
  transform: translate(0.12rem, -0.12rem);
}

.profile-icon {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--accent);
}

.profile-icon svg {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.orcid-icon {
  font-family: Arial, sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: -0.06em;
}

.profile-links small,
.profile-links strong {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.profile-links small {
  color: var(--subtle);
  font-size: 0.6rem;
  font-weight: 540;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.profile-links strong {
  margin-top: 0.08rem;
  font-size: 0.7rem;
  font-weight: 590;
}

.link-arrow {
  color: var(--accent);
  font-size: 0.72rem;
  transition: transform 150ms ease;
}

.content-section {
  padding-block: clamp(4.75rem, 9vw, 7rem);
  border-bottom: 1px solid var(--line-strong);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  margin-bottom: 3.5rem;
  margin-left: 4.75rem;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 570;
  letter-spacing: -0.045em;
  line-height: 1.1;
}

.section-note {
  max-width: 35rem;
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.75rem;
}

.subsection,
.talk-group,
.career-list {
  margin-left: 4.75rem;
}

.subsection h3,
.talk-group h3 {
  margin: 0 0 1.2rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line-strong);
  font-size: 0.84rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.publication-list,
.talk-list,
.award-list,
.career-records,
.journal-list {
  padding: 0;
  list-style: none;
}

.publication-list {
  margin: 0;
}

.publication-list li {
  position: relative;
  padding: 0.25rem 0 1.65rem 2.25rem;
}

.publication-list li + li {
  padding-top: 1.65rem;
  border-top: 1px solid var(--line);
}

.publication-list li::before {
  position: absolute;
  top: 0.43rem;
  left: 0;
  color: var(--subtle);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  content: attr(value);
}

.publication-list li + li::before {
  top: 1.83rem;
}

.publication-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.25rem;
  align-items: start;
}

.publication-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
}

.publication-title {
  min-width: 0;
  margin: 0;
  font-size: 0.98rem;
  font-weight: 620;
  letter-spacing: -0.018em;
  line-height: 1.5;
}

.publication-badge {
  display: inline-block;
  padding: 0.13rem 0.48rem;
  border: 1px solid var(--accent, var(--line));
  border-radius: 999px;
  background: var(--accent-soft, transparent);
  color: var(--accent, var(--subtle));
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 650;
  line-height: 1.5;
  vertical-align: 0.12rem;
  white-space: nowrap;
}

.publication-summary {
  max-width: 47rem;
  margin: 0.7rem 0 0;
  font-size: 0.82rem;
  line-height: 1.72;
}

.publication-meta {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.65;
}

.publication-meta strong {
  color: var(--foreground);
  font-weight: 620;
}

.publication-note {
  margin: 0.2rem 0 0;
  color: var(--subtle);
  font-size: 0.68rem;
  font-style: italic;
  line-height: 1.5;
}

.publication-links {
  display: flex;
  gap: 1rem;
  margin: 0.48rem 0 0;
}

.publication-links a {
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 620;
  text-underline-offset: 0.18rem;
}

.publication-links a:hover {
  text-decoration: underline;
}

.talk-group + .talk-group {
  margin-top: 4.5rem;
}

.talk-list {
  margin: 0;
}

.talk-list li {
  display: grid;
  grid-template-columns: 6.4rem minmax(0, 1fr) auto;
  gap: 1.25rem;
  align-items: start;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.talk-list time,
.award-list time {
  padding-top: 0.12rem;
  color: var(--subtle);
  font-family: var(--font-mono);
  font-size: 0.65rem;
}

.talk-title,
.award-title {
  margin: 0;
  font-size: 0.87rem;
  font-weight: 610;
  letter-spacing: -0.012em;
  line-height: 1.5;
}

.talk-venue,
.award-list li div > p:last-child {
  margin: 0.28rem 0 0;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.55;
}

.talk-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
}

.talk-tags span {
  padding: 0.18rem 0.48rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.58rem;
  font-weight: 620;
  white-space: nowrap;
}

.talk-tags .award-tag {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  background: var(--accent-soft);
  color: var(--accent);
}

.career-list {
  display: grid;
  gap: 3.25rem;
}

.career-group h3 {
  margin: 0 0 1.1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line-strong);
  font-size: 0.84rem;
  font-weight: 650;
}

.career-entry {
  display: grid;
  grid-template-columns: 6.4rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 0.2rem 0;
}

.career-entry span {
  color: var(--subtle);
  font-size: 0.68rem;
}

.career-entry p {
  margin: 0;
  font-size: 0.83rem;
  font-weight: 570;
}

.award-list {
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.award-list li {
  display: grid;
  grid-template-columns: 6.4rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.career-records,
.journal-list {
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.career-records li {
  display: grid;
  grid-template-columns: 6.4rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.career-records span {
  padding-top: 0.1rem;
  color: var(--subtle);
  font-family: var(--font-mono);
  font-size: 0.65rem;
}

.career-records p {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 570;
  line-height: 1.55;
}

.career-records .career-detail {
  margin-top: 0.35rem;
  color: var(--subtle);
  font-size: 0.74rem;
  font-weight: 400;
  line-height: 1.65;
}

.journal-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.journal-list li {
  padding: 1rem 0.85rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.5;
}

.journal-list li:first-child {
  padding-left: 0;
}

.journal-list li + li {
  border-left: 1px solid var(--line);
}

.site-footer {
  padding-block: 2.5rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  color: var(--subtle);
  font-size: 0.66rem;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 720px) {
  html {
    scroll-padding-top: 7rem;
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    gap: 0.7rem 1rem;
    padding-block: 0.8rem 0.65rem;
  }

  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    gap: 1.25rem;
  }

  .header-actions {
    grid-column: 2;
    grid-row: 1;
  }

  .intro {
    padding-top: 4rem;
  }

  .intro h1 {
    display: block;
  }

  .intro h1 span {
    display: block;
    margin-top: 0.8rem;
    font-size: 0.36em;
  }

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

  .profile-links > a + a {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .section-heading {
    margin-left: 0;
  }

  .subsection,
  .talk-group,
  .career-list {
    margin-left: 0;
  }

  .talk-list li,
  .award-list li,
  .career-entry,
  .career-records li {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .journal-list {
    grid-template-columns: 1fr;
  }

  .journal-list li {
    padding-inline: 0;
  }

  .journal-list li + li {
    border-left: 0;
  }

  .talk-tags {
    justify-content: flex-start;
    margin-top: 0.15rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.3rem;
  }

  .publication-heading {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .publication-badges {
    justify-content: flex-start;
    margin-top: 0.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

.multiline {
  white-space: pre-line;
}