:root {
  --ink: #111111;
  --muted: #646464;
  --line: #deded8;
  --soft: #f6f6f2;
  --paper: #ffffff;
  --accent: #b42318;
  --header-bg: rgba(255, 255, 255, 0.96);
  --body-copy: #3f3f3f;
  --card-copy: #4f4f4f;
  --strong-copy: #404040;
  --highlight: #fffaf2;
  --contact-bg: #111111;
  --contact-text: #ffffff;
  --contact-muted: #aaaaaa;
  --contact-link: #cccccc;
  --contact-line: #666666;
  --footer-line: #333333;
  --sans: Arial, Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: Georgia, "Times New Roman", "Songti SC", serif;
  --shell: 1080px;
}

:root[data-theme="dark"] {
  --ink: #f1f2ed;
  --muted: #a5a8a2;
  --line: #363a35;
  --soft: #191c19;
  --paper: #0f120f;
  --accent: #ff766c;
  --header-bg: rgba(15, 18, 15, 0.96);
  --body-copy: #c4c7c1;
  --card-copy: #bdc0ba;
  --strong-copy: #d3d5d0;
  --highlight: #211b16;
  --contact-bg: #080a08;
  --contact-text: #f2f3ef;
  --contact-muted: #a5a8a2;
  --contact-link: #c8cbc5;
  --contact-line: #4c504b;
  --footer-line: #262926;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
}

body,
.site-header,
.research-section,
.journey-section,
.ongoing-work,
.paper-badges span,
.control-button {
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

body.nav-open { overflow: hidden; }

img { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; }

.shell {
  width: min(calc(100% - 48px), var(--shell));
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 12px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-160%);
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: 62px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.wordmark > span:first-child {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 12px;
}

.wordmark-name {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.header-actions,
.site-switches {
  display: flex;
  align-items: center;
}

.header-actions { gap: 8px; }

.site-switches {
  gap: 4px;
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.control-button {
  display: inline-flex;
  min-width: 34px;
  height: 30px;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--muted);
  background: var(--paper);
  cursor: pointer;
  font-size: 10px;
  font-weight: 700;
}

.control-button:hover,
.control-button:focus-visible {
  color: var(--ink);
  border-color: var(--ink);
}

.theme-symbol { font-size: 13px; line-height: 1; }

.nav-toggle { display: none; }

.hero {
  padding: 112px 0 58px;
  border-bottom: 1px solid var(--line);
}

.hero-backdrop { display: none; }

.hero-grid {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 52px;
  align-items: start;
}

.portrait-wrap {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
}

.portrait-frame {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--soft);
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 68%;
}

.portrait-note {
  padding: 12px 0 0;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.portrait-note span {
  display: block;
  color: var(--muted);
  font-size: 11px;
}

.portrait-note strong {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  font-weight: 600;
}

.hero-copy {
  grid-column: 2;
  grid-row: 1;
  padding-top: 4px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

.hero h1 { margin: 0; }

.hero h1 > span {
  display: inline;
  font-family: var(--serif);
  font-size: clamp(43px, 5.4vw, 66px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.045em;
}

.hero h1 small {
  display: inline;
  margin-left: 15px;
  color: var(--muted);
  font-size: clamp(21px, 2.5vw, 30px);
  font-weight: 400;
  letter-spacing: -0.02em;
}

.hero-lead {
  max-width: 700px;
  margin: 24px 0 18px;
  font-family: var(--serif);
  font-size: clamp(21px, 2.1vw, 28px);
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.topic-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
}

.topic-line i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #a4a4a0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 15px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
}

.button-primary {
  color: var(--paper);
  background: var(--ink);
}

.button-primary:hover {
  color: var(--ink);
  background: var(--paper);
}

.button-ghost { background: var(--paper); }
.button-ghost:hover { background: var(--soft); }

.section { padding: 66px 0; }

.about-section,
.publications-section { background: var(--paper); }

.research-section,
.journey-section { background: var(--soft); }

.news-section,
.research-section,
.journey-section { border-bottom: 1px solid var(--line); }

.about-grid,
.compact-grid,
.section-heading {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.section-heading { margin-bottom: 30px; }

.section-kicker {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-kicker span {
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 1px solid #aaa;
  border-radius: 50%;
  font-size: 8px;
}

.section-kicker p { margin: 0; }

.about-copy h2,
.section-heading h2,
.compact-heading h2,
.contact-section h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(29px, 3.7vw, 43px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.about-copy > p {
  max-width: 800px;
  margin: 22px 0 0;
  color: var(--body-copy);
  font-size: 15px;
  line-height: 1.75;
}

.about-copy > p + p { margin-top: 10px; }

.about-copy p a,
.news-list a {
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 22px;
}

.about-links a {
  font-size: 12px;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.about-links a::after { content: " ↗"; }

.compact-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.compact-heading h2 { font-size: 34px; }
.compact-heading p { margin: 0; color: var(--muted); font-size: 11px; }

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

.news-list li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.news-list time {
  color: var(--muted);
  font-family: var(--serif);
  font-size: 13px;
}

.news-list p { margin: 0; font-size: 13px; line-height: 1.55; }
.news-list p > span { margin-right: 7px; color: var(--accent); font-size: 10px; font-weight: 700; text-transform: uppercase; }
.news-list em { font-family: var(--serif); }
.news-highlight { background: var(--highlight); }
.news-highlight time { color: var(--accent); font-weight: 700; }

.section-heading > div:last-child > p {
  max-width: 700px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.research-card,
.research-card.featured {
  min-width: 0;
  padding: 22px 24px 20px 0;
  color: var(--ink);
  background: transparent;
}

.research-card + .research-card {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.research-card:last-child { padding-right: 0; }
.card-index { color: var(--muted); font-size: 10px; }
.research-icon { display: none; }

.research-card h3 {
  margin: 28px 0 0;
  font-family: var(--serif);
  font-size: 23px;
  line-height: 1.2;
}

.research-card .card-en,
.research-card.featured .card-en {
  margin: 4px 0 14px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.research-card > p:not(.card-en),
.research-card.featured > p:not(.card-en) {
  margin: 0;
  color: var(--card-copy);
  font-size: 12px;
  line-height: 1.65;
}

.research-card ul,
.research-card.featured ul {
  margin: 17px 0 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  list-style: none;
  font-size: 10px;
}

.featured-papers { border-top: 1px solid var(--ink); }

.paper-card {
  display: grid;
  grid-template-columns: 145px minmax(0, 1fr) 180px;
  gap: 7px 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.paper-topline {
  grid-column: 1;
  grid-row: 1 / span 5;
}

.paper-number {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 12px;
}

.venue {
  display: block;
  max-width: 130px;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.5;
  text-transform: uppercase;
}

.paper-card h3 {
  grid-column: 2;
  margin: 0;
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.35;
}

.paper-card > p {
  grid-column: 2;
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.55;
}

.paper-card > .paper-authors {
  color: var(--strong-copy);
  font-size: 11px;
}

.paper-badges {
  grid-column: 3;
  grid-row: 1 / span 2;
  display: flex;
  align-content: flex-start;
  flex-wrap: wrap;
  gap: 5px;
}

.paper-badges span {
  padding: 3px 6px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--soft);
  font-size: 9px;
  font-weight: 600;
}

.paper-links {
  grid-column: 3;
  grid-row: 3 / span 2;
  align-self: end;
}

.paper-links a {
  font-size: 11px;
  font-weight: 700;
  text-underline-offset: 4px;
}

.ongoing-works {
  margin-top: 34px;
  border-left: 3px solid var(--accent);
  background: var(--soft);
}

.ongoing-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
}

.ongoing-heading span {
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ongoing-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 10px;
}

.ongoing-work {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 32px;
  padding: 22px 24px;
  background: transparent;
}

.ongoing-work + .ongoing-work { border-top: 1px solid var(--line); }

.ongoing-work span {
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ongoing-work h3 {
  margin: 7px 0 0;
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.4;
}

.ongoing-work p { margin: 0 0 7px; color: var(--muted); font-size: 11px; }
.ongoing-work a { font-size: 11px; font-weight: 700; text-underline-offset: 4px; }
.ongoing-links { display: flex; flex-wrap: wrap; gap: 16px; }

.other-papers { margin-top: 48px; }

.list-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink);
}

.list-heading h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 25px;
}

.list-heading span { color: var(--muted); font-size: 10px; }
.paper-list { margin: 0; padding: 0; list-style: none; }

.paper-list li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 30px;
  gap: 14px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.list-no { color: var(--muted); font-family: var(--serif); font-size: 11px; }

.paper-list h4 {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.4;
}

.paper-list p { margin: 3px 0 0; color: var(--muted); font-size: 10px; }
.paper-list p strong { margin-left: 7px; color: var(--strong-copy); font-weight: 600; }

.paper-list li > a {
  display: grid;
  width: 27px;
  height: 27px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  text-decoration: none;
  font-size: 11px;
}

.paper-list li > a:hover { color: var(--paper); background: var(--ink); border-color: var(--ink); }

.timeline { border-top: 1px solid var(--ink); }

.timeline article {
  display: grid;
  grid-template-columns: 140px 260px minmax(0, 1fr);
  gap: 24px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.timeline time { color: var(--muted); font-family: var(--serif); font-size: 12px; }

.timeline h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 16px;
}

.timeline p { margin: 0; color: var(--muted); font-size: 11px; }

.honors {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 32px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--ink);
}

.honors > div span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
}

.honors h3 {
  margin: 7px 0 0;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.35;
}

.honors ul { margin: 0; padding: 0; list-style: none; }

.honors li {
  display: grid;
  grid-template-columns: 95px minmax(0, 1fr);
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
}

.honors li strong { font-weight: 700; }
.honors li span { color: var(--muted); }

.contact-section {
  padding: 58px 0;
  color: var(--contact-text);
  background: var(--contact-bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 64px;
  align-items: end;
}

.contact-section .eyebrow { color: var(--contact-muted); }
.contact-section h2 { max-width: 620px; font-size: 34px; }

.contact-email {
  position: relative;
  display: block;
  padding: 0 32px 13px 0;
  border-bottom: 1px solid var(--contact-line);
  text-decoration: none;
}

.contact-email span { display: block; color: var(--contact-muted); font-size: 10px; }
.contact-email strong { display: block; margin-top: 3px; font-size: 20px; font-weight: 500; }
.contact-email i { position: absolute; right: 0; bottom: 14px; font-style: normal; }
.social-links { display: flex; gap: 20px; margin-top: 15px; }
.social-links a { color: var(--contact-link); font-size: 11px; text-underline-offset: 4px; }

.site-footer {
  padding: 18px 0;
  color: #999;
  background: var(--contact-bg);
  border-top: 1px solid var(--footer-line);
  font-size: 10px;
}

.site-footer .shell { display: flex; align-items: center; justify-content: space-between; }
.site-footer p { margin: 0; }
.site-footer a { text-decoration: none; }

.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 400ms ease, transform 400ms ease;
}

.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-short { transition-delay: 50ms; }
.reveal-delay,
.reveal-delay-long { transition-delay: 100ms; }

:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.contact-section :focus-visible,
.site-footer :focus-visible { outline-color: var(--contact-text); }

@media (max-width: 850px) {
  .shell { width: min(calc(100% - 34px), var(--shell)); }
  .site-header { height: 58px; }
  .wordmark-name { display: none; }

  .nav-toggle {
    display: grid;
    width: 38px;
    height: 38px;
    place-content: center;
    gap: 6px;
    border: 0;
    background: transparent;
  }

  .nav-toggle > span:not(.sr-only) {
    display: block;
    width: 21px;
    height: 1px;
    background: var(--ink);
  }

  .nav-open .nav-toggle > span:nth-child(2) { transform: translateY(3.5px) rotate(45deg); }
  .nav-open .nav-toggle > span:nth-child(3) { transform: translateY(-3.5px) rotate(-45deg); }

  .site-nav {
    position: fixed;
    inset: 58px 0 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 18px;
    background: var(--paper);
    transform: translateX(100%);
    transition: transform 180ms ease;
  }

  .nav-open .site-nav { transform: translateX(0); }
  .site-nav a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 18px; }

  .hero { padding: 92px 0 45px; }
  .hero-grid { grid-template-columns: 140px minmax(0, 1fr); gap: 24px; }
  .hero h1 > span { display: block; font-size: 40px; }
  .hero h1 small { display: block; margin: 7px 0 0; font-size: 21px; }
  .hero-lead { margin-top: 18px; font-size: 19px; }
  .portrait-note strong { font-size: 11px; }
  .section { padding: 48px 0; }
  .about-grid,
  .compact-grid,
  .section-heading { grid-template-columns: 1fr; gap: 20px; }
  .section-heading { margin-bottom: 24px; }
  .section-kicker span { width: 23px; height: 23px; }

  .research-grid { grid-template-columns: 1fr; }
  .research-card,
  .research-card.featured,
  .research-card + .research-card { padding: 17px 0; border-left: 0; }
  .research-card + .research-card { border-top: 1px solid var(--line); }
  .research-card h3 { margin-top: 18px; }

  .paper-card { grid-template-columns: 105px minmax(0, 1fr); gap: 7px 18px; }
  .paper-topline { grid-column: 1; grid-row: 1 / span 6; }
  .paper-card h3,
  .paper-card > p { grid-column: 2; }
  .paper-badges,
  .paper-links { grid-column: 2; grid-row: auto; }
  .paper-links { margin-top: 4px; }

  .ongoing-work,
  .honors { grid-template-columns: 1fr; gap: 15px; }

  .timeline article { grid-template-columns: 105px 1fr; gap: 5px 18px; }
  .timeline p { grid-column: 2; }

  .contact-grid { grid-template-columns: 1fr; gap: 35px; }
}

@media (max-width: 560px) {
  .theme-button [data-theme-label] { display: none; }
  .site-switches { gap: 3px; margin-left: 0; padding-left: 0; border-left: 0; }
  .control-button { min-width: 32px; padding-inline: 7px; }
  .hero-grid { grid-template-columns: 1fr; }
  .portrait-wrap { grid-column: 1; grid-row: 1; width: 180px; }
  .hero-copy { grid-column: 1; grid-row: 2; }
  .topic-line { gap: 7px; }
  .news-list li { grid-template-columns: 72px minmax(0, 1fr); gap: 11px; }
  .compact-heading { align-items: flex-start; flex-direction: column; gap: 3px; }
  .paper-card { grid-template-columns: 1fr; gap: 8px; }
  .paper-topline,
  .paper-card h3,
  .paper-card > p,
  .paper-badges,
  .paper-links { grid-column: 1; grid-row: auto; }
  .paper-topline { display: flex; justify-content: space-between; gap: 12px; }
  .venue { max-width: none; text-align: right; }
  .paper-list li { grid-template-columns: 26px minmax(0, 1fr) 27px; gap: 8px; }
  .timeline article { grid-template-columns: 1fr; gap: 4px; }
  .timeline p { grid-column: 1; }
  .honors li { grid-template-columns: 80px 1fr; }
  .ongoing-heading { align-items: flex-start; flex-direction: column; gap: 3px; }
  .contact-email strong { font-size: 17px; }
  .site-footer .shell { align-items: flex-start; flex-direction: column; gap: 5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}