:root {
  color-scheme: light;
  --paper: #f4f2ec;
  --paper-raised: #faf9f5;
  --ink: #17201d;
  --muted: #606b66;
  --accent: #176b5b;
  --accent-soft: #dce9e3;
  --line: #cfd6d1;
  --serif: Georgia, "Times New Roman", "Noto Serif CJK SC", "Songti SC", serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page: min(1180px, calc(100vw - 64px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 76% 13%, rgba(23, 107, 91, 0.07), transparent 24rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

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

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

[data-lang] {
  display: none;
}

html[data-language="en"] [data-lang="en"],
html[data-language="zh"] [data-lang="zh"] {
  display: inline;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 8px 14px;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

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

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  width: 100%;
  min-height: 74px;
  padding: 14px max(32px, calc((100vw - 1180px) / 2));
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 32px;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 78%, transparent);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(14px);
}

.wordmark {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.wordmark-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 13px;
  font-style: italic;
}

.site-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms ease;
}

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

.language-switch {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.language-switch button {
  border: 0;
  padding: 6px 2px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
}

.language-switch button[aria-pressed="true"] {
  color: var(--accent);
  font-weight: 700;
}

main,
.site-footer {
  width: var(--page);
  margin-inline: auto;
}

.hero {
  position: relative;
  min-height: calc(100svh - 74px);
  padding: clamp(88px, 13vh, 150px) 0 72px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
  gap: clamp(52px, 8vw, 128px);
  align-items: center;
}

.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 12%;
  right: 8%;
  width: clamp(210px, 28vw, 390px);
  aspect-ratio: 1;
  border: 1px solid color-mix(in srgb, var(--accent) 14%, transparent);
  border-radius: 50%;
}

.eyebrow,
.note-label,
.pub-venue,
.section-number,
.timeline-date {
  margin: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 840px;
  margin: 24px 0 30px;
  font-family: var(--serif);
  font-size: clamp(48px, 6.6vw, 86px);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.hero h1 em {
  color: var(--accent);
  font-weight: 400;
}

.hero-intro {
  max-width: 710px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.72;
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.academic-links {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.academic-links a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.035em;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease;
}

.academic-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.button {
  min-height: 48px;
  padding: 11px 18px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

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

.button-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.button-quiet {
  border-color: var(--line);
}

.button-quiet:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-note {
  padding: 24px 0;
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 18px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.hero-side {
  align-self: end;
  display: grid;
  gap: 30px;
}

.hero-portrait {
  position: relative;
  margin: 0 14px 14px 0;
  background: var(--accent-soft);
}

.hero-portrait::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 14px -14px -14px 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--line));
}

.hero-portrait img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  display: block;
  object-fit: cover;
}

.hero-note p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.hero-note .note-label {
  margin-top: 0;
  color: var(--accent);
  font-size: 11px;
}

.note-index {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
}

.section {
  padding: clamp(84px, 12vw, 150px) 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: clamp(42px, 6vw, 72px);
  display: grid;
  grid-template-columns: 80px 1fr;
  align-items: baseline;
}

.section-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(37px, 5vw, 60px);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.research-grid {
  margin-left: 80px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
}

.research-card {
  min-height: 310px;
  padding: 28px clamp(22px, 3vw, 38px) 30px;
  border-right: 1px solid var(--line);
  transition: background 180ms ease;
}

.research-card:last-child {
  border-right: 0;
}

.research-card:hover {
  background: var(--paper-raised);
}

.card-symbol {
  color: var(--accent);
  font-family: var(--serif);
  font-size: 40px;
}

.research-card h3 {
  margin: 72px 0 16px;
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 400;
  line-height: 1.2;
}

.research-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.publication-list {
  margin-left: 80px;
  border-top: 1px solid var(--ink);
}

.publication {
  position: relative;
  padding: 28px 0;
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) 72px;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}

.publication.featured::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -80px;
  width: 2px;
  background: var(--accent);
}

.pub-year {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.pub-body h3 {
  max-width: 830px;
  margin: 8px 0 11px;
  font-family: var(--serif);
  font-size: clamp(19px, 2.2vw, 26px);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.28;
}

.pub-venue {
  font-size: 10px;
}

.pub-authors {
  max-width: 900px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.pub-authors strong {
  color: var(--ink);
  font-weight: 650;
}

.pub-link {
  align-self: start;
  justify-self: end;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  text-decoration: none;
}

.text-link {
  margin: 32px 0 0 160px;
  display: inline-flex;
  gap: 10px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
}

.timeline {
  margin-left: 80px;
  border-top: 1px solid var(--ink);
}

.timeline-item {
  padding: 30px 0;
  display: grid;
  grid-template-columns: minmax(140px, 0.25fr) 1fr;
  gap: 30px;
  border-bottom: 1px solid var(--line);
}

.timeline-item h3 {
  margin: 0 0 7px;
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 400;
}

.timeline-item p:not(.timeline-date) {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.contact {
  margin: 20px 0 100px;
  padding: clamp(48px, 8vw, 90px);
  background: var(--ink);
  color: var(--paper-raised);
}

.contact .eyebrow {
  color: #7bc2ae;
}

.contact h2 {
  max-width: 780px;
  margin: 18px 0 38px;
  font-family: var(--serif);
  font-size: clamp(36px, 5.7vw, 66px);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.contact > a {
  color: #b8e2d5;
  font-family: var(--mono);
  font-size: clamp(13px, 2vw, 17px);
}

.site-footer {
  padding: 24px 0 36px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 860px) {
  :root {
    --page: min(100% - 40px, 700px);
  }

  .site-header {
    padding-inline: 20px;
    grid-template-columns: 1fr auto;
    gap: 16px;
  }

  .site-nav {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 92px;
    grid-template-columns: 1fr;
    gap: 72px;
  }

  .hero-note {
    max-width: 420px;
  }

  .hero-side {
    width: min(100%, 440px);
    justify-self: end;
  }

  .section-heading {
    grid-template-columns: 48px 1fr;
  }

  .research-grid,
  .publication-list,
  .timeline {
    margin-left: 48px;
  }

  .research-grid {
    grid-template-columns: 1fr;
  }

  .research-card {
    min-height: auto;
    padding: 28px 4px 34px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .research-card h3 {
    margin-top: 32px;
  }

  .publication.featured::before {
    left: -48px;
  }

  .text-link {
    margin-left: 96px;
  }
}

@media (max-width: 560px) {
  :root {
    --page: calc(100% - 32px);
  }

  body {
    font-size: 15px;
  }

  .site-header {
    min-height: 66px;
    padding: 11px 16px;
  }

  .wordmark-name {
    display: none;
  }

  .hero {
    padding-top: 72px;
  }

  .hero-side {
    width: 100%;
  }

  .hero h1 {
    font-size: clamp(43px, 13vw, 62px);
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    justify-content: space-between;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .research-grid,
  .publication-list,
  .timeline {
    margin-left: 0;
  }

  .publication {
    padding: 25px 0 28px;
    grid-template-columns: 1fr auto;
    gap: 9px 16px;
  }

  .publication.featured::before {
    top: 22px;
    bottom: 22px;
    left: -16px;
  }

  .pub-year {
    grid-column: 1;
  }

  .pub-body {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .pub-link {
    grid-column: 2;
    grid-row: 1;
  }

  .text-link {
    margin-left: 0;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .contact {
    margin-bottom: 64px;
    padding: 42px 24px;
  }

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

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

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