:root {
  --accent: #8a1538;
  --accent-dark: #68102a;
  --ink: #171717;
  --muted: #62646a;
  --line: #d8d9dc;
  --line-strong: #b9bbc0;
  --paper: #ffffff;
  --soft: #f5f5f6;
  --max-width: 1240px;
  --gutter: clamp(22px, 5vw, 72px);
  --section-space: clamp(86px, 10vw, 154px);
  --display: Georgia, 'Times New Roman', 'Noto Serif SC', 'Songti SC', serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.not-found {
  min-height: 100vh;
  display: grid;
  align-content: center;
  gap: 1rem;
  width: min(760px, calc(100% - 3rem));
  margin-inline: auto;
}

.not-found h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.5rem, 10vw, 7.5rem);
  font-weight: 500;
  letter-spacing: -0.055em;
}

.not-found p {
  margin: 0;
  color: var(--muted);
}

.not-found .eyebrow {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.not-found a {
  width: fit-content;
  margin-top: 1rem;
  color: var(--accent);
  font-weight: 700;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { color: var(--accent); }
img { display: block; max-width: 100%; }
button { font: inherit; }
::selection { color: #fff; background: var(--accent); }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: #fff;
  background: var(--accent);
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
}
.header-inner {
  width: min(100%, calc(var(--max-width) + var(--gutter) * 2));
  min-height: 82px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.wordmark {
  flex: 0 0 auto;
  color: var(--accent);
  font-family: var(--display);
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1;
  letter-spacing: 0.025em;
  text-decoration: none;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(22px, 3vw, 48px);
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-list a {
  position: relative;
  display: inline-block;
  padding: 28px 0 25px;
  font-size: 15px;
  font-weight: 560;
  text-decoration: none;
}
.nav-list a::after {
  position: absolute;
  right: 0;
  bottom: 18px;
  left: 0;
  height: 2px;
  content: '';
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}
.nav-list a:hover::after,
.nav-list a:focus-visible::after { transform: scaleX(1); transform-origin: left; }
.nav-list .language-link { color: var(--accent); }
.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
  color: var(--ink);
}
.menu-button span {
  display: block;
  width: 100%;
  height: 1.5px;
  margin: 5px 0;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}
.menu-button[aria-expanded='true'] span:first-child { transform: translateY(6.5px) rotate(45deg); }
.menu-button[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
.menu-button[aria-expanded='true'] span:last-child { transform: translateY(-6.5px) rotate(-45deg); }

.container { width: min(100%, calc(var(--max-width) + var(--gutter) * 2)); margin: 0 auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section-space); }
.section-rule { border-top: 1px solid var(--line); }
.section-heading {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(45px, 6.2vw, 82px);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.045em;
}
.section-intro { max-width: 680px; margin: 28px 0 0; color: var(--muted); font-size: 18px; }
.accent-line { width: 78px; height: 3px; margin-block: 30px; background: var(--accent); }

.hero {
  min-height: calc(100svh - 82px);
  display: grid;
  align-items: center;
  padding-block: clamp(54px, 7vw, 96px);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.72fr);
  gap: clamp(48px, 8vw, 118px);
  align-items: center;
}
.hero-name {
  margin: 0;
  color: var(--accent);
  font-family: var(--display);
  font-size: clamp(70px, 9vw, 132px);
  font-weight: 400;
  line-height: 0.82;
  letter-spacing: -0.055em;
}
.hero-name-zh {
  display: block;
  margin-top: 26px;
  font-size: 0.47em;
  letter-spacing: 0.01em;
}
.role { margin: 36px 0 0; font-size: clamp(20px, 2.2vw, 28px); font-weight: 560; line-height: 1.45; }
.affiliation { display: block; font-weight: 440; }
.research-identity { margin: 0; font-family: var(--display); font-size: clamp(29px, 3.1vw, 44px); line-height: 1.12; }
.hero-copy { max-width: 700px; margin: 20px 0 0; color: #3f4146; font-size: clamp(17px, 1.45vw, 20px); }
.profile-links { display: flex; flex-wrap: wrap; gap: 8px 0; margin-top: 36px; }
.profile-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 620;
  text-decoration: none;
}
.profile-links a:not(:last-child)::after { width: 1px; height: 18px; margin: 0 18px; content: ''; background: var(--line-strong); }
.profile-links svg { width: 18px; height: 18px; }
.portrait-frame { position: relative; justify-self: end; width: min(100%, 380px); margin: 0; }
.portrait-frame::before {
  position: absolute;
  z-index: -1;
  top: -18px;
  right: -18px;
  width: 56%;
  height: 44%;
  border-top: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
  content: '';
}
.portrait-frame picture { display: block; }
.portrait-frame img { width: 100%; height: auto; aspect-ratio: 5 / 7; border: 1px solid var(--line); object-fit: cover; object-position: center top; }
.portrait-caption { margin: 12px 0 0; color: var(--muted); font-size: 12px; text-align: right; letter-spacing: 0.04em; text-transform: uppercase; }

.news-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.news-inner { display: grid; grid-template-columns: 0.78fr 2.22fr; gap: clamp(32px, 6vw, 90px); padding-block: 50px; }
.news-title { margin: 0; color: var(--accent); font-family: var(--display); font-size: 27px; font-weight: 400; }
.news-list { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; list-style: none; }
.news-item { min-height: 112px; padding: 0 28px; border-left: 1px solid var(--line); }
.news-date { display: block; margin-bottom: 11px; color: var(--accent); font-size: 13px; font-weight: 650; letter-spacing: 0.06em; text-transform: uppercase; }
.news-item p { margin: 0; font-family: var(--display); font-size: 18px; line-height: 1.48; }

.research-layout { display: grid; grid-template-columns: minmax(300px, 0.9fr) minmax(520px, 1.35fr); gap: clamp(60px, 9vw, 132px); align-items: center; }
.research-summary { max-width: 520px; margin-top: 28px; color: #3f4146; }
.applications { padding-top: 24px; border-top: 1px solid var(--line); }
.applications-label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: 0.11em; text-transform: uppercase; }
.applications-value { color: var(--accent); font-family: var(--display); font-size: 21px; }
.research-loop { position: relative; min-height: 640px; }
.research-loop::before {
  position: absolute;
  inset: 9% 9%;
  border: 1px solid var(--line-strong);
  border-radius: 42%;
  content: '';
}
.research-item { position: absolute; z-index: 1; width: 42%; padding: 10px; background: var(--paper); text-align: center; }
.research-item:nth-child(1) { top: 0; left: 29%; }
.research-item:nth-child(2) { top: 34%; right: -1%; }
.research-item:nth-child(3) { right: 29%; bottom: -1%; }
.research-item:nth-child(4) { top: 34%; left: -1%; }
.research-number { display: block; color: var(--accent); font-family: var(--display); font-size: 58px; line-height: 1; }
.research-name { display: block; max-width: 280px; margin: 10px auto 0; font-size: 17px; font-weight: 560; line-height: 1.45; }

.publications-header { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 62px; }
.scholar-link { color: var(--accent); font-size: 14px; font-weight: 650; white-space: nowrap; }
.pub-list { border-top: 2px solid var(--accent); }
.publication {
  display: grid;
  grid-template-columns: 74px 112px minmax(0, 1fr) auto;
  gap: 26px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.publication.featured { border-bottom-color: rgba(138, 21, 56, 0.6); }
.pub-year { font-family: var(--display); font-size: 22px; }
.pub-journal { padding-top: 4px; color: var(--muted); font-size: 13px; font-weight: 700; letter-spacing: 0.05em; }
.pub-title { margin: 0; font-family: var(--display); font-size: clamp(20px, 2vw, 27px); font-weight: 400; line-height: 1.3; }
.pub-authors { margin: 10px 0 0; color: var(--muted); font-size: 14px; line-height: 1.55; }
.pub-authors strong { color: var(--accent); }
.pub-link { padding-top: 4px; color: var(--accent); font-size: 14px; font-weight: 650; white-space: nowrap; }

.timeline { margin-top: 68px; border-top: 1px solid var(--line); }
.timeline-row {
  position: relative;
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 44px;
  padding: 28px 0 28px 42px;
  border-bottom: 1px solid var(--line);
}
.timeline-row::before { position: absolute; top: 36px; left: 4px; width: 10px; height: 10px; border-radius: 50%; content: ''; background: var(--accent); }
.timeline-date { color: var(--accent); font-size: 14px; font-weight: 650; }
.timeline-place { margin: 0; font-size: 18px; font-weight: 650; }
.timeline-role { margin: 4px 0 0; color: var(--muted); font-size: 15px; }

.service-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(54px, 9vw, 120px); }
.subheading { margin: 0 0 28px; font-family: var(--display); font-size: clamp(32px, 4vw, 48px); font-weight: 400; line-height: 1.12; }
.open-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line-strong); }
.open-list li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.open-list strong { display: block; font-size: 16px; font-weight: 650; }
.open-list span { display: block; margin-top: 3px; color: var(--muted); font-size: 14px; }

.site-footer { position: relative; padding: 64px 0; color: #fff; background: var(--accent); }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 50px; align-items: end; }
.footer-name { margin: 0; font-family: var(--display); font-size: clamp(30px, 4vw, 50px); font-weight: 400; }
.footer-email { display: inline-block; margin-top: 14px; font-size: 15px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px 30px; justify-content: flex-end; }
.footer-links a { font-size: 14px; font-weight: 600; }
.footer-meta { display: flex; justify-content: space-between; gap: 30px; margin-top: 52px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,0.32); font-size: 12px; opacity: 0.84; }
.back-to-top {
  position: fixed;
  z-index: 90;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  background: rgba(255,255,255,0.94);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 180ms ease, transform 180ms ease, color 180ms ease, border-color 180ms ease;
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { color: var(--accent); border-color: var(--accent); }

[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 620ms ease, transform 620ms ease; }
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1040px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) 340px; gap: 48px; }
  .research-layout { grid-template-columns: 1fr; }
  .research-loop { width: min(100%, 760px); margin: 0 auto; }
  .publication { grid-template-columns: 64px 92px minmax(0, 1fr); }
  .pub-link { grid-column: 3; }
}

@media (min-width: 861px) and (max-height: 820px) {
  .hero { min-height: calc(100svh - 82px); padding-block: 34px; }
  .hero-name { font-size: clamp(76px, 7.2vw, 94px); }
  .hero-name-zh { margin-top: 16px; font-size: 0.42em; }
  .role { margin-top: 24px; font-size: 20px; }
  .accent-line { margin-block: 20px; }
  .research-identity { font-size: 30px; }
  .hero-copy { margin-top: 13px; font-size: 15px; line-height: 1.58; }
  .profile-links { margin-top: 22px; }
  .portrait-frame { width: min(100%, 320px); }
  .portrait-caption { margin-top: 8px; }
}

@media (max-width: 860px) {
  html { scroll-padding-top: 70px; }
  .header-inner { min-height: 70px; }
  .menu-button { display: block; }
  .site-nav {
    position: fixed;
    inset: 70px 0 auto;
    max-height: 0;
    overflow: hidden;
    border-bottom: 1px solid transparent;
    background: #fff;
    transition: max-height 240ms ease, border-color 240ms ease;
  }
  .site-nav.is-open { max-height: calc(100svh - 70px); border-color: var(--line); }
  .nav-list { display: block; padding: 18px var(--gutter) 28px; }
  .nav-list li { border-bottom: 1px solid var(--line); }
  .nav-list a { display: block; padding: 17px 0; font-size: 17px; }
  .nav-list a::after { display: none; }
  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .portrait-frame { justify-self: start; width: min(72vw, 390px); }
  .hero-name { font-size: clamp(64px, 16vw, 104px); }
  .news-inner { grid-template-columns: 1fr; }
  .news-list { grid-template-columns: 1fr; }
  .news-item { min-height: 0; padding: 20px 0; border-top: 1px solid var(--line); border-left: 0; }
  .publication { grid-template-columns: 58px minmax(0, 1fr); gap: 14px 24px; }
  .pub-journal { grid-column: 2; grid-row: 1; }
  .pub-content { grid-column: 1 / -1; }
  .pub-link { grid-column: 1 / -1; }
  .service-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .section { padding-block: 76px; }
  .hero { padding-block: 44px 74px; }
  .hero-name { font-size: clamp(56px, 19vw, 82px); }
  .hero-name-zh { margin-top: 18px; }
  .role { margin-top: 28px; }
  .profile-links { display: grid; grid-template-columns: 1fr 1fr; gap: 15px 22px; }
  .profile-links a:not(:last-child)::after { display: none; }
  .portrait-frame { width: min(82vw, 340px); }
  .research-loop { min-height: 700px; }
  .research-loop::before { inset: 8% 5%; border-radius: 44%; }
  .research-item { width: 54%; }
  .research-item:nth-child(1) { left: 23%; }
  .research-item:nth-child(2) { top: 32%; right: -4%; }
  .research-item:nth-child(3) { right: 23%; }
  .research-item:nth-child(4) { top: 32%; left: -4%; }
  .research-number { font-size: 45px; }
  .research-name { font-size: 14px; }
  .publications-header { display: block; }
  .scholar-link { display: inline-block; margin-top: 24px; }
  .timeline-row { grid-template-columns: 1fr; gap: 6px; padding-left: 34px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  .footer-meta { display: block; }
  .footer-meta span { display: block; margin-top: 6px; }
}

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