:root {
  --ink:#111111;
  --muted:#5a5d63;
  --rule:#e2e5e9;
  --accent:#114a8a;
  --bg:#ffffff;
  --focus:#0a6ae8;
  --font-serif:Georgia,"Times New Roman",Times,serif;
  font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  font-synthesis:none;
  color-scheme:light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink:#f2f4f7;
    --muted:#aeb5bf;
    --rule:#343a43;
    --accent:#8db8f2;
    --bg:#111318;
    --focus:#79b5ff;
    color-scheme:dark;
  }
}

:root[data-theme="dark"] {
  --ink:#f2f4f7;
  --muted:#aeb5bf;
  --rule:#343a43;
  --accent:#8db8f2;
  --bg:#111318;
  --focus:#79b5ff;
  --logo-surface:#ffffff;
  --logo-stroke:rgba(17,19,24,0.12);
  color-scheme:dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink:#f2f4f7;
    --muted:#aeb5bf;
    --rule:#343a43;
    --accent:#8db8f2;
    --bg:#111318;
    --focus:#79b5ff;
    --logo-surface:#ffffff;
    --logo-stroke:rgba(17,19,24,0.12);
    color-scheme:dark;
  }
}

* { box-sizing:border-box; }

html { scroll-behavior:smooth; }

body {
  margin:0;
  min-width:320px;
  background:var(--bg);
  color:var(--ink);
  font-size:17px;
  line-height:1.65;
  letter-spacing:-0.01em;
  text-rendering:optimizeLegibility;
}

a {
  color:var(--accent);
  text-decoration-thickness:.06em;
  text-underline-offset:.14em;
  transition:color .2s ease, opacity .2s ease, text-decoration-color .2s ease;
}

a:hover,
a:focus-visible {
  color:var(--ink);
}

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

.skip-link {
  position:fixed;
  top:-5rem;
  left:1rem;
  z-index:20;
  padding:.6rem .85rem;
  color:var(--bg);
  background:var(--ink);
  border-radius:.4rem;
  text-decoration:none;
  transition:top .2s ease;
}

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

.site-header,main,footer {
  width:min(calc(100% - 2rem),760px);
  margin-inline:auto;
}

.site-header {
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:1.5rem;
  padding:1.1rem 0 .9rem;
  border-bottom:1px solid var(--rule);
}

.brand {
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  color:var(--ink);
  text-decoration:none;
}

.brand-mark {
  width:3rem;
  height:3rem;
  border-radius:50%;
  object-fit:cover;
  display:block;
  border:1px solid var(--rule);
  background:var(--rule);
}

.name {
  color:var(--ink);
  font-size:1.8rem;
  font-weight:600;
  letter-spacing:-.02em;
  text-decoration:none;
}

nav {
  display:flex;
  flex-wrap:wrap;
  gap:.5rem 1.35rem;
  font-size:1.1rem;
  letter-spacing:-.01em;
}

nav a {
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:.2rem 0;
  color:var(--muted);
  text-decoration:none;
}

nav a:hover,
nav a:focus-visible,
nav a[aria-current="page"] {
  color:var(--ink);
}

nav a:hover,
nav a:focus-visible {
  text-decoration:underline;
  text-underline-offset:.28em;
  text-decoration-thickness:.08em;
}

nav a[aria-current="page"] {
  text-decoration:underline;
  text-underline-offset:.28em;
  text-decoration-thickness:.08em;
}

.theme-toggle {
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.35rem 0;
  border:0;
  background:transparent;
  color:var(--muted);
  font:inherit;
  font-size:.9rem;
  cursor:pointer;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  color:var(--ink);
}

.theme-toggle:focus-visible {
  outline:2px solid var(--focus);
  outline-offset:4px;
  border-radius:.2rem;
}

.theme-switch {
  position:relative;
  display:block;
  width:2.75rem;
  height:1.5rem;
  flex:0 0 auto;
  border:1px solid var(--muted);
  border-radius:999px;
  background:var(--rule);
  transition:background .2s ease, border-color .2s ease;
}

.theme-switch__knob {
  position:absolute;
  top:.12rem;
  left:.12rem;
  width:1.18rem;
  height:1.18rem;
  border:1px solid var(--rule);
  border-radius:50%;
  background:var(--bg);
  transition:transform .2s ease;
}

.theme-toggle[aria-pressed="true"] .theme-switch {
  border-color:var(--accent);
  background:var(--accent);
}

.theme-toggle[aria-pressed="true"] .theme-switch__knob {
  transform:translateX(1.23rem);
}

main {
  min-height:calc(100vh - 155px);
  padding:4rem 0 5.25rem;
}

h1 {
  margin:0 0 1.4rem;
  font-family:var(--font-serif);
  font-size:clamp(1.8rem, 4.2vw, 2.5rem);
  line-height:1.15;
  font-weight:400;
  letter-spacing:-.012em;
}

.lead {
  margin:0 0 3rem;
  font-size:1.18rem;
  line-height:1.5;
  letter-spacing:-.015em;
  color:var(--ink);
}

.home-hero {
  display:grid;
  grid-template-columns:1fr;
  gap:2rem;
  align-items:start;
  margin:0 0 3rem;
  padding:1rem 0 0;
}

.home-portrait {
  width:100%;
  max-width:22rem;
  aspect-ratio:1 / 1.15;
  object-fit:cover;
  display:block;
  margin-inline:auto;
  border-radius:50%;
  border:1px solid var(--rule);
}

.home-copy {
  min-width:0;
}

.home-kicker {
  margin:0 0 .75rem;
  color:var(--muted);
  font-size:.82rem;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.home-copy h1 {
  margin:0 0 1rem;
  font-size:clamp(1.8rem, 4.2vw, 2.5rem);
}

.home-copy p {
  margin:0;
  color:var(--ink);
  font-size:1.1rem;
  line-height:1.6;
}

.home-copy p + p {
  margin-top:1.5rem;
}

.home-links {
  display:flex;
  flex-wrap:wrap;
  gap:1rem;
  margin-top:1.5rem;
}

.home-links a {
  display:inline-flex;
  align-items:center;
  padding:.6rem 1rem;
  border:1px solid var(--rule);
  border-radius:999px;
  background:var(--bg);
  color:var(--ink);
  text-decoration:none;
}

.home-links a:hover,
.home-links a:focus-visible {
  border-color:var(--ink);
}

.experiment-list {
  margin-top:.25rem;
}

.experiment {
  padding:2.2rem 0;
  border-top:1px solid var(--rule);
}

.experiment:last-child {
  border-bottom:1px solid var(--rule);
}

.experiment-heading {
  display:flex;
  align-items:flex-start;
  gap:1rem;
}

.experiment-heading > div {
  min-width:0;
  flex:1 1 auto;
}

.logo-badge {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:4.8rem;
  min-width:4.8rem;
  height:3.2rem;
  flex:0 0 auto;
  padding:.4rem .6rem;
  border-radius:1.05rem;
  background:transparent;
  border:1px solid transparent;
}

.experiment-logo {
  flex:0 0 auto;
  width:auto;
  max-width:100%;
  height:auto;
  max-height:100%;
  object-fit:contain;
  object-position:center;
  display:block;
  margin:0 auto;
}

.experiment-logo--wide { padding:.2rem; }
.experiment-logo--ninja { object-fit:contain; }

:root[data-theme="dark"] .logo-badge,
:root[data-theme="dark"] .career-logo {
  background:var(--logo-surface);
  border-color:var(--logo-stroke);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,0.12);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-badge,
  :root:not([data-theme="light"]) .career-logo {
    background:var(--logo-surface);
    border-color:var(--logo-stroke);
    box-shadow:inset 0 0 0 1px rgba(255,255,255,0.12);
  }
}

.logo-badge img {
  display:block;
  max-width:100%;
  max-height:100%;
  width:auto;
  height:auto;
  object-fit:contain;
  object-position:center;
  margin:0 auto;
}

h2 {
  margin:0;
  font-family:var(--font-serif);
  font-size:1.5rem;
  line-height:1.25;
  font-weight:400;
  letter-spacing:-.01em;
}

h2 a { color:var(--ink); }

.dates {
  margin:.3rem 0 0;
  color:var(--muted);
  font-size:.88rem;
  line-height:1.4;
}

.experiment > p {
  margin:1rem 0 0 5.8rem;
  max-width:42rem;
}

figure {
  margin:1.75rem 0 0 5.8rem;
  max-width:42rem;
}

figure img {
  display:block;
  width:100%;
  height:auto;
  border:1px solid var(--rule);
  background:#f9f9f9;
}

figure.diagram img {
  padding:1.3rem;
  object-fit:contain;
}

figcaption {
  margin-top:.5rem;
  color:var(--muted);
  font-size:.78rem;
  line-height:1.4;
}

.external-link {
  margin:2rem 0 0;
}

.profile-link {
  display:inline-flex;
  align-items:center;
  gap:.8rem;
  color:var(--ink);
  text-decoration:none;
}

.profile-link img {
  width:3.5rem;
  height:auto;
  object-fit:contain;
}

.profile-link span {
  text-decoration:underline;
  text-underline-offset:.2em;
}

.link-list,.career {
  margin:0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--ink);
}

.link-list li,.career li {
  border-bottom:1px solid var(--rule);
}

.link-list a {
  display:flex;
  justify-content:space-between;
  gap:1.5rem;
  padding:1rem 0;
  color:var(--ink);
  text-decoration:none;
}

.link-list a span:last-child {
  color:var(--muted);
  font-size:.9rem;
  text-align:right;
}

.link-list a:hover span:first-child,
.link-list a:focus-visible span:first-child {
  text-decoration:underline;
}

.profile-links {
  margin-top:4rem;
}

.profile-label {
  display:inline-flex;
  align-items:center;
  gap:.7rem;
}

.profile-label img {
  width:1.5rem;
  height:1.5rem;
  object-fit:contain;
}

.publication-list {
  margin:0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--ink);
}

.publication-list li {
  padding:.65rem 0;
  border-bottom:1px solid var(--rule);
}

.publication-list a,
.publication-list .pub-title {
  display:block;
  color:var(--ink);
  font-weight:400;
  font-size:1.02rem;
  line-height:1.45;
  letter-spacing:-.01em;
  text-decoration:none;
}

.publication-list a:hover,
.publication-list a:focus-visible {
  text-decoration:underline;
}

.publication-list span {
  display:block;
  margin-top:.2rem;
  color:var(--muted);
  font-size:.84rem;
  line-height:1.5;
}

.lead + .talk-section,
.talk-section + .talk-section {
  margin-top:4rem;
}

.talk-section {
  margin-top:3.25rem;
  padding-top:.15rem;
}

.talk-section:first-of-type {
  margin-top:0;
}

.talk-section h2 {
  margin-bottom:1.2rem;
  font-size:1.35rem;
  letter-spacing:-.01em;
}

.talk-section .publication-list {
  margin-top:.5rem;
}

main > .lead:last-of-type {
  margin-top:2.5rem;
  margin-bottom:1.5rem;
}

.timeline-section {
  margin-top:2.8rem;
}

.timeline-section:first-of-type {
  margin-top:0;
}

.about-page .timeline-section:first-of-type {
  margin-top:2.8rem;
}

.timeline-section h2 {
  margin:0 0 1rem;
  font-size:1.35rem;
  letter-spacing:-.01em;
}

.contact-section {
  margin-top:3.2rem;
}

.contact-list {
  display:grid;
  gap:1rem;
  padding-top:.4rem;
}

.contact-item {
  display:flex;
  align-items:flex-start;
  gap:.75rem;
  color:var(--ink);
  line-height:1.5;
}

.contact-item--stack {
  align-items:flex-start;
}

.contact-icon {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:1.5rem;
  height:1.5rem;
  font-size:1.1rem;
  line-height:1;
}

.contact-item a,
.contact-item address,
.contact-item .contact-label {
  font-style:normal;
  color:var(--ink);
  text-decoration:none;
}

.contact-item a {
  font-weight:500;
}

.contact-item a:hover,
.contact-item a:focus-visible {
  text-decoration:underline;
}

.contact-item address {
  margin-top:.15rem;
  font-size:1rem;
  color:var(--muted);
}

.contact-label {
  display:block;
  font-size:.8rem;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
}

.map-wrap {
  margin-top:1.25rem;
  border:1px solid var(--rule);
  border-radius:1rem;
  overflow:hidden;
  background:var(--bg);
}

.map-wrap iframe {
  display:block;
  width:100%;
  min-height:18rem;
  border:0;
}

.career {
  border-top:1px solid var(--ink);
  margin:0;
  padding:0;
  list-style:none;
}

.career li {
  display:grid;
  grid-template-columns:8rem minmax(0, 1fr);
  gap:1.5rem;
  padding:1.3rem 0;
  align-items:center;
}

.career time {
  color:var(--muted);
  font-size:.9rem;
  letter-spacing:-.01em;
}

.career-content {
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:1.5rem;
  min-width:0;
}

.career-info {
  flex:1 1 auto;
  min-width:0;
}

.career strong {
  font-size:1.08rem;
  letter-spacing:-.02em;
}

.career-logo {
  flex:0 0 auto;
  max-height:2.4rem;
  max-width:6.2rem;
  width:auto;
  height:auto;
  object-fit:contain;
}

.career-logo--kyoto { max-height:2.2rem; max-width:2.8rem; }
.career-logo--utokyo { max-height:2.1rem; max-width:7rem; }
.career-logo--snu { max-height:2.2rem; max-width:2.8rem; }

.career strong,
.career span {
  display:block;
}

.career strong {
  font-weight:500;
}

.career-line,
.career-thesis,
.career-university {
  display:block;
}

.career-line {
  margin-top:.18rem;
  color:var(--muted);
  font-size:.7rem;
}

.career-thesis {
  margin-top:.12rem;
  color:var(--muted);
  font-size:.7rem;
}

.career-line a,
.career-thesis a {
  color:inherit;
  text-decoration:none;
}

.career-line a:hover,
.career-line a:focus-visible,
.career-thesis a:hover,
.career-thesis a:focus-visible {
  text-decoration:underline;
}

.career-university {
  margin-top:.12rem;
  color:var(--ink);
  font-size:.84rem;
  font-weight:600;
}

footer {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:1.5rem 0 3rem;
  border-top:1px solid var(--ink);
  color:var(--muted);
  font-size:.8rem;
}

.footer-contact {
  color:var(--muted);
  text-decoration:none;
}

.footer-contact:hover,
.footer-contact:focus-visible {
  color:var(--ink);
  text-decoration:underline;
}

@media (max-width:580px) {
  body { font-size:16px; }

  .site-header {
    display:block;
    padding-top:1rem;
  }

  .site-header,
  main,
  footer {
    width:min(calc(100% - 1.5rem),760px);
  }

  nav {
    margin-top:.75rem;
    gap:.85rem 1rem;
  }

  .home-hero {
    grid-template-columns:1fr;
    gap:1.5rem;
    margin-bottom:2.5rem;
  }

  .home-portrait {
    max-width:18rem;
    margin-inline:auto;
  }

  .home-copy h1 {
    font-size:clamp(2rem, 10vw, 2.6rem);
  }

  .home-links {
    gap:.75rem;
  }

  .home-links a {
    padding:.55rem .85rem;
  }

  main {
    padding:3.5rem 0 4rem;
  }

  .experiment > p,
  figure {
    margin-left:0;
  }

  .career li {
    grid-template-columns:1fr;
    gap:.5rem;
  }

  .career-content {
    display:block;
    gap:1rem;
  }

  .career-content .logo-badge {
    display:none;
  }

  .link-list a {
    align-items:baseline;
  }
}

@media (prefers-color-scheme: dark) {
  figure img {
    background:#191c22;
  }

  .home-links a:hover,
  .home-links a:focus-visible {
    border-color:var(--ink);
  }
}

:root[data-theme="dark"] figure img {
  background:#191c22;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior:auto; }
  *, *::before, *::after {
    transition-duration:0.01ms !important;
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
  }
}