:root {
  color-scheme: light dark;
  --bg: #fff;
  --ink: #22272e;
  --muted: #606873;
  --link: #1768b6;
  --line: #e4e8ed;
  --wash: #f3f8fe;
  --sep: #cbd3dd;
  --focus: #e99a36;
  --marker: #ffe08a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181c;
    --ink: #e3e6ea;
    --muted: #9aa3ad;
    --link: #6cb0f0;
    --line: #2a3038;
    --wash: #1c232c;
    --sep: #3a424c;
    --marker: #6b5418;
  }
}

* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body { margin: 0; color: var(--ink); background: var(--bg); font: 1rem/1.65 'Lato', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', 'Yu Gothic', Meiryo, sans-serif; }
:lang(ja) h1 { letter-spacing: 0; }
a { color: var(--link); text-decoration: none; text-underline-offset: 3px; }
a:hover { text-decoration: underline; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
p { margin: 0 0 14px; }
h1, h2, h3, h4 { line-height: 1.35; }
h1 { font-size: 2rem; font-weight: 400; margin: 0 0 22px; letter-spacing: -.6px; }
h1 span { font-size: .8em; }
h2 { font-size: 1.4rem; font-weight: 700; margin: 0 0 20px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
h3, h4 { margin: 0; }

.page { max-width: 848px; margin: auto; padding: 0 24px; }
.skip-link { position: absolute; top: 8px; left: 12px; padding: 8px 14px; background: var(--bg); transform: translateY(-160%); z-index: 5; }
.skip-link:focus { transform: translateY(0); }

/* Language switch */
.lang-switch { display: flex; justify-content: flex-end; padding-top: 16px; }
.lang-toggle { display: inline-flex; align-items: center; padding: 3px; border: 1px solid var(--line); border-radius: 999px; background: var(--bg); color: var(--muted); font-size: .75rem; box-shadow: 0 1px 2px rgba(0, 0, 0, .05); transition: border-color .2s; }
.lang-toggle:hover { border-color: var(--sep); }
.lang-options { position: relative; display: grid; grid-template-columns: 1fr 1fr; }
.lang-options::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 50%; border-radius: 999px; background: var(--ink); transition: transform .28s cubic-bezier(.3, .7, .3, 1); }
.lang-options[data-active="ja"]::before { transform: translateX(100%); }
.lang-options a { position: relative; z-index: 1; min-width: 38px; padding: 3px 10px; border-radius: 999px; color: var(--muted); font-weight: 700; letter-spacing: .06em; text-align: center; transition: color .28s; }
.lang-options a:hover { color: var(--ink); text-decoration: none; }
.lang-options a[aria-current="page"] { color: var(--bg); }

/* Profile */
.profile { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 40px; align-items: center; padding: 16px 0 14px; }
.profile-links { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 20px; font-size: .875rem; }
.portrait { margin: 0; }
.portrait img { display: block; width: 100%; height: auto; border-radius: 4px; }
.portrait figcaption { margin-top: 8px; font-size: .8125rem; color: var(--muted); text-align: center; }

main > section { margin-top: 44px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; border-bottom: 1px solid var(--line); margin-bottom: 24px; }
.section-heading h2 { border: 0; margin-bottom: 0; }
.secondary-link { font-size: .875rem; white-space: nowrap; }

/* News */
.news-list { list-style: none; margin: 0; padding: 0; font-size: .9375rem; }
.news-list li { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 16px; padding: 4px 0; }
.news-list time { color: var(--muted); font-size: .8125rem; padding-top: 2px; }

/* Publications */
.pub-note { color: var(--muted); font-size: .8125rem; margin: -12px 0 18px; }
.research-area { font-size: 1.1875rem; font-weight: 700; margin: 36px 0 12px; padding-left: 10px; border-left: 3px solid var(--link); line-height: 1.3; }
h2 + .research-area { margin-top: 0; }
.paper { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 24px; align-items: center; padding: 22px 0; }
.paper + .paper { border-top: 1px solid var(--line); }
.paper.paper-featured { padding: 22px 18px; margin: 0 0 8px; background: var(--wash); border-radius: 5px; }
.paper-featured + .paper { border-top: 0; }
.paper h4 { font-size: 1.09375rem; font-weight: 700; margin-bottom: 7px; }
.paper p { margin-bottom: 5px; }
.authors { font-size: .875rem; line-height: 1.6; }
.authors .me { background: linear-gradient(transparent 55%, var(--marker) 55%); }
.venue { color: var(--muted); font-size: .875rem; font-style: italic; }
.paper-links { display: flex; flex-wrap: wrap; font-size: .875rem; margin-top: 8px; }
.paper-links a + a { margin-left: 14px; padding-left: 14px; border-left: 1px solid var(--sep); }
.paper-media { display: block; position: relative; overflow: hidden; border-radius: 3px; }
.paper-media img { display: block; width: 100%; height: auto; }
.paper-media video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; pointer-events: none; transition: opacity .15s ease; }
.paper-media.is-playing video { opacity: 1; }
.other-research { margin-top: 28px; }
.paper-text { display: block; padding: 20px 0; }
.paper-text .venue { margin-bottom: 0; }
.lang-tag { font-weight: 400; font-size: .8125rem; color: var(--muted); }
.lang-tag::before { content: "("; }
.lang-tag::after { content: ")"; }
.pub-tag { display: inline-block; margin-left: 6px; padding: 0 7px; border: 1px solid var(--sep); border-radius: 3px; font-size: .75rem; font-style: normal; line-height: 1.6; }
.pub-tag-hl { border-color: #c9701f; color: #c9701f; }

/* CV rows */
.cv-row { display: grid; grid-template-columns: 120px minmax(0, 1fr) auto; align-items: center; gap: 24px; padding: 17px 0; }
.cv-row + .cv-row { border-top: 1px solid var(--line); }
.cv-logo { width: 120px; height: 60px; display: flex; align-items: center; justify-content: center; }
.cv-logo img { max-width: 100%; max-height: 100%; }
.cv-logo-fallback { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: var(--wash); color: var(--muted); font-weight: 700; }
.cv-title { font-weight: 700; font-size: .9375rem; }
.cv-role { font-size: .875rem; color: var(--muted); }
.cv-date { color: var(--muted); font-size: .8125rem; white-space: nowrap; text-align: right; }
.cv-list + .cv-lines { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.cv-line { display: flex; align-items: baseline; gap: 20px; padding: 6px 0; font-size: .875rem; }
.cv-line-text { flex: 1; }
.cv-line-title { font-weight: 700; }

.plain-list { margin: 0; padding-left: 20px; font-size: .9375rem; }

/* Collapsible section */
.disclosure summary { position: relative; cursor: pointer; list-style: none; }
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure summary h2 { margin: 0; padding-right: 34px; }
.disclosure summary::after { content: "+"; position: absolute; top: 0; right: 2px; color: var(--muted); font-size: 1.4rem; line-height: 1.35; }
.disclosure[open] summary::after { content: "−"; }
.disclosure summary:hover h2 { color: var(--link); }
.disclosure-content { padding-top: 16px; }
.talk-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 20px; padding: 14px 0; }
.talk-row + .talk-row { border-top: 1px solid var(--line); }
.talk-title { font-size: 1rem; margin-bottom: 4px; }
.talk-venue { margin: 0; color: var(--muted); font-size: .875rem; }
.talk-date { margin: 0; color: var(--muted); font-size: .8125rem; white-space: nowrap; }

footer { display: flex; justify-content: space-between; gap: 20px; margin-top: 48px; padding: 20px 0 32px; border-top: 1px solid var(--line); font-size: .8125rem; color: var(--muted); }

@media (max-width: 650px) {
  .profile { grid-template-columns: minmax(0, 1fr) 170px; gap: 24px; }
  .cv-row { grid-template-columns: 100px minmax(0, 1fr); gap: 4px 20px; }
  .cv-logo { width: 100px; grid-row: span 2; }
  .cv-row .cv-date { grid-column: 2; text-align: left; }
  .cv-line { display: block; }
  .paper { grid-template-columns: 170px minmax(0, 1fr); gap: 20px; }
}
@media (max-width: 500px) {
  .page { padding: 0 16px; }
  .profile { display: flex; flex-direction: column-reverse; align-items: flex-start; gap: 24px; padding-top: 12px; }
  .portrait { width: 160px; }
  main > section { margin-top: 36px; }
  .news-list li { grid-template-columns: 1fr; gap: 0; }
  .paper { grid-template-columns: 1fr; gap: 16px; }
  .paper-media { width: min(100%, 240px); }
  .paper.paper-featured { padding: 20px 14px; }
  .talk-row { grid-template-columns: 1fr; gap: 2px; }
  .section-heading { flex-wrap: wrap; gap: 0 12px; }
  footer { flex-direction: column; gap: 5px; }
}
@media (prefers-reduced-motion: reduce) {
  .paper-media video, .lang-options::before, .lang-options a { transition: none; }
}