:root {
  --background: #f7f7f3;
  --surface: #ffffff;
  --text: #182024;
  --muted: #657076;
  --line: #d9deda;
  --accent: #2858c7;
  --accent-dark: #173d98;
  --soft-blue: #e9efff;
  --green: #22654f;
  --soft-green: #e6f1ec;
  --gold: #805700;
  --soft-gold: #fff1cd;
  --header-height: 64px;
  --content-width: 1080px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

a:focus-visible {
  outline: 3px solid rgba(40, 88, 199, 0.32);
  outline-offset: 4px;
  border-radius: 3px;
}

p,
h1,
h2,
h3,
figure,
dl,
dd {
  margin-top: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--text);
  color: var(--surface);
  transform: translateY(-150%);
}

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

.content-shell,
.nav-shell {
  width: min(calc(100% - 48px), var(--content-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--header-height);
  border-bottom: 1px solid rgba(217, 222, 218, 0.86);
  background: var(--background);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 28px;
}

.brand {
  flex: 0 0 auto;
  color: var(--text);
  font-size: 1rem;
  font-weight: 750;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  min-width: 0;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.91rem;
  font-weight: 600;
  text-decoration: none;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 720px) 208px;
  align-items: center;
  justify-content: start;
  gap: 52px;
  min-height: 0;
  padding: 58px 0 52px;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow,
.section-index,
.focus-label,
.timeline-period {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin-bottom: 18px;
  font-size: 3.25rem;
  line-height: 1.04;
  letter-spacing: 0;
}

.native-name {
  margin-left: 12px;
  color: var(--muted);
  font-size: 0.52em;
  font-weight: 570;
  white-space: nowrap;
}

.tagline {
  max-width: 700px;
  margin-bottom: 20px;
  color: var(--text);
  font-size: 1.45rem;
  font-weight: 650;
  line-height: 1.4;
}

.colorful-word {
  white-space: nowrap;
}

.colorful-word > span:nth-child(7n + 1) { color: #d73a49; }
.colorful-word > span:nth-child(7n + 2) { color: #e07924; }
.colorful-word > span:nth-child(7n + 3) { color: #a06b00; }
.colorful-word > span:nth-child(7n + 4) { color: #27825a; }
.colorful-word > span:nth-child(7n + 5) { color: #2475b8; }
.colorful-word > span:nth-child(7n + 6) { color: #5b58b5; }
.colorful-word > span:nth-child(7n) { color: #9b4e9d; }

.bio {
  max-width: 710px;
  color: #3f494e;
}

.bio p:last-child {
  margin-bottom: 0;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.action-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 650;
  text-decoration: none;
}

.action-link:hover {
  border-color: #aab5b0;
  color: var(--accent-dark);
}

.action-link--primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--surface);
}

.action-link--primary:hover {
  border-color: var(--accent-dark);
  background: var(--accent-dark);
  color: var(--surface);
}

.action-link--wechat {
  cursor: pointer;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 650;
  line-height: inherit;
  user-select: none;
}

.wechat-control {
  display: inline-flex;
  position: relative;
}

.copy-toast {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  width: max-content;
  max-width: 210px;
  padding: 7px 10px;
  border-radius: 5px;
  background: var(--text);
  color: var(--surface);
  font-size: 0.76rem;
  font-weight: 650;
  line-height: 1.3;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 5px);
  transition: opacity 0.16s ease, transform 0.16s ease;
  z-index: 5;
}

.copy-toast::after {
  position: absolute;
  top: 100%;
  left: 50%;
  border: 5px solid transparent;
  border-top-color: var(--text);
  content: "";
  transform: translateX(-50%);
}

.copy-toast--visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.portrait {
  margin: 0;
}

.portrait img {
  display: block;
  width: 208px;
  height: 208px;
  border: 1px solid var(--line);
  border-radius: 6px;
  object-fit: cover;
  object-position: center;
}

.page-section {
  padding: 62px 0;
  border-top: 1px solid var(--line);
}

.page-section--surface,
.page-section--contact {
  background: var(--background);
}

.section-heading {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 36px;
  margin-bottom: 32px;
}

.section-heading .section-index,
.section-heading h2 {
  margin-bottom: 0;
}

.section-heading h2,
.page-section--contact h2 {
  font-size: 2rem;
  line-height: 1.2;
}

.section-heading--with-note {
  display: flex;
  align-items: end;
  justify-content: space-between;
}

.section-heading--with-note a {
  font-size: 0.9rem;
  font-weight: 650;
}

.research-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 64px;
  margin-left: 216px;
}

.research-focus {
  padding-top: 20px;
  border-top: 2px solid var(--text);
}

.research-focus h3 {
  margin-bottom: 12px;
  font-size: 1.35rem;
}

.research-focus p:last-child {
  color: #4e595e;
}

.focus-label {
  margin-bottom: 8px;
}

.prior-work {
  grid-column: 1 / -1;
  margin: 22px 0 0;
  padding-top: 17px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.publication-list {
  display: grid;
  gap: 16px;
}

.publication {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 26px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 8px 26px rgba(24, 32, 36, 0.045);
}

.publication-visual,
.publication-visual img,
.paper-cover {
  width: 100%;
  aspect-ratio: 16 / 9;
}

.publication-visual-link {
  display: block;
  align-self: start;
  color: inherit;
  text-decoration: none;
}

.publication-visual {
  align-self: start;
  overflow: hidden;
  border: 1px solid rgba(24, 32, 36, 0.08);
  border-radius: 6px;
  background: #ffffff;
  position: relative;
}

.publication-visual img,
.publication-preview {
  display: block;
  width: 100%;
  height: 100%;
  background: #ffffff;
  object-fit: contain;
}

.publication-preview {
  position: absolute;
  inset: 0;
  opacity: 0;
  object-fit: contain !important;
  transition: opacity 0.18s ease;
}

.publication-visual--playing .publication-preview {
  opacity: 1;
}

.preview-hint {
  position: absolute;
  right: 9px;
  bottom: 9px;
  padding: 4px 7px;
  border-radius: 4px;
  background: rgba(24, 32, 36, 0.78);
  color: #ffffff;
  font-size: 0.65rem;
  font-weight: 650;
  opacity: 0;
  transition: opacity 0.18s ease;
}

.publication-visual-link:hover .preview-hint,
.publication-visual-link:focus-visible .preview-hint {
  opacity: 1;
}

.publication-visual--playing .preview-hint {
  opacity: 0;
}

.publication-visual > img {
  object-fit: cover;
}

.publication-visual:has(.publication-preview) > img {
  object-fit: contain;
}

.paper-cover {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.paper-cover::before,
.paper-cover::after {
  position: absolute;
  right: 24px;
  width: 42%;
  height: 2px;
  background: currentColor;
  content: "";
  opacity: 0.28;
}

.paper-cover::before {
  top: 38%;
}

.paper-cover::after {
  top: 48%;
  width: 28%;
}

.paper-cover--blue {
  background: var(--soft-blue);
  color: var(--accent-dark);
}

.paper-cover--green {
  background: var(--soft-green);
  color: var(--green);
}

.paper-cover--gold {
  background: var(--soft-gold);
  color: var(--gold);
}

.paper-cover-label {
  position: relative;
  z-index: 1;
  font-size: 1.65rem;
  font-weight: 800;
}

.paper-cover-meta {
  position: relative;
  z-index: 1;
  max-width: 75%;
  font-size: 0.72rem;
  font-weight: 650;
  line-height: 1.35;
}

.publication-copy h3 {
  margin: 8px 0 10px;
  font-size: 1.28rem;
  line-height: 1.35;
}

.publication-copy h3 a {
  color: var(--text);
  text-decoration: none;
}

.publication-copy h3 a:hover {
  color: var(--accent-dark);
}

.publication-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 24px;
}

.highlight {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.69rem;
  font-weight: 750;
}

.highlight--blue {
  background: var(--soft-blue);
  color: var(--accent-dark);
}

.highlight--green {
  background: var(--soft-green);
  color: var(--green);
}

.highlight--gold {
  background: var(--soft-gold);
  color: var(--gold);
}

.authors,
.venue,
.publication-summary {
  margin-bottom: 9px;
  font-size: 0.88rem;
  line-height: 1.5;
}

.authors,
.publication-summary {
  color: #4f5a5f;
}

.venue {
  color: var(--muted);
}

.publication-award {
  display: inline-block;
  margin-left: 6px;
  color: #c21f16;
  font-weight: 800;
}

.publication-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 16px;
}

.publication-links a {
  font-size: 0.82rem;
  font-weight: 750;
  text-decoration: none;
}

.timeline-board {
  position: relative;
  margin-left: 216px;
  padding-top: 40px;
}

.timeline-board::before {
  position: absolute;
  top: 40px;
  bottom: 18px;
  left: 50%;
  width: 1px;
  background: var(--line);
  content: "";
}

.timeline-lane-label {
  position: absolute;
  top: 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  text-transform: uppercase;
}

.timeline-lane-label--education {
  right: calc(50% + 32px);
}

.timeline-lane-label--experience {
  left: calc(50% + 32px);
}

.timeline-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 64px minmax(0, 1fr);
  min-height: 100px;
  position: relative;
}

.timeline-event {
  grid-row: 1;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.timeline-row--education .timeline-event {
  grid-column: 1;
  text-align: right;
}

.timeline-row--experience .timeline-event {
  grid-column: 3;
}

.timeline-marker {
  grid-column: 2;
  grid-row: 1;
  justify-self: center;
  width: 9px;
  height: 9px;
  margin-top: 17px;
  border: 2px solid var(--background);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  z-index: 1;
}

.timeline-kind {
  display: none;
}

.timeline-period {
  margin-bottom: 4px;
}

.timeline-event h3 {
  margin-bottom: 4px;
  font-size: 1rem;
  line-height: 1.45;
}

.timeline-detail {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.personal-note {
  margin: 14px 0 0 216px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.75fr);
  gap: 80px;
  align-items: start;
}

.contact-layout h2 {
  margin-bottom: 14px;
}

.contact-layout > div > p:last-child {
  max-width: 560px;
  margin-bottom: 0;
  color: var(--muted);
}

.contact-list {
  margin-bottom: 0;
  border-top: 1px solid #c7cdc8;
}

.contact-list > div {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid #c7cdc8;
}

.contact-list dt {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.contact-list dd {
  margin-bottom: 0;
  overflow-wrap: anywhere;
  font-size: 0.92rem;
}

.contact-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--background);
}

.site-footer .content-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  gap: 24px;
  color: var(--muted);
  font-size: 0.82rem;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer a {
  font-weight: 650;
  text-decoration: none;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) 160px;
    gap: 40px;
  }

  .portrait img {
    width: 160px;
    height: 160px;
  }

  .publication {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .research-layout,
  .timeline-board,
  .personal-note {
    margin-left: 0;
  }
}

@media (max-width: 720px) {
  :root {
    --header-height: 58px;
  }

  .content-shell,
  .nav-shell {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .nav-shell {
    gap: 18px;
  }

  .site-nav {
    gap: 20px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav a {
    flex: 0 0 auto;
    font-size: 0.8rem;
  }

  .site-nav a:first-child {
    display: none;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) 128px;
    gap: 24px 28px;
    min-height: 0;
    padding: 34px 0 38px;
  }

  .hero-copy {
    display: contents;
  }

  .eyebrow,
  .hero h1,
  .bio,
  .contact-actions {
    grid-column: 1 / -1;
  }

  .eyebrow {
    grid-row: 1;
    margin-bottom: -12px;
  }

  .hero h1 {
    grid-row: 2;
    margin-bottom: -10px;
    font-size: 2.45rem;
  }

  .tagline {
    grid-column: 1;
    grid-row: 3;
    align-self: center;
    margin-bottom: 0;
    font-size: 1.2rem;
  }

  .portrait {
    grid-column: 2;
    grid-row: 3;
    width: 128px;
    margin: 0;
  }

  .portrait img {
    width: 128px;
    height: 128px;
  }

  .bio {
    grid-row: 4;
    margin-top: 0;
  }

  .contact-actions {
    grid-row: 5;
    margin-top: 0;
  }

  .action-link {
    flex: 1 1 auto;
  }

  .wechat-control {
    flex: 1 1 auto;
  }

  .wechat-control .action-link {
    width: 100%;
  }

  .page-section {
    padding: 48px 0;
  }

  .section-heading,
  .section-heading--with-note {
    display: block;
    margin-bottom: 26px;
  }

  .section-heading--with-note > a {
    display: inline-block;
    margin-top: 14px;
  }

  .section-index {
    margin-bottom: 6px;
  }

  .research-layout,
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .research-focus + .research-focus {
    margin-top: 4px;
  }

  .publication {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 16px;
  }

  .publication-copy h3 {
    font-size: 1.16rem;
  }

  .paper-cover {
    min-height: 0;
  }

  .preview-hint {
    display: none;
  }

  .timeline-board {
    margin-left: 0;
    padding: 8px 0 0 30px;
  }

  .timeline-board::before {
    top: 8px;
    bottom: 8px;
    left: 6px;
  }

  .timeline-lane-label {
    display: none;
  }

  .timeline-row {
    display: block;
    min-height: 0;
    padding-bottom: 34px;
  }

  .timeline-event,
  .timeline-row--education .timeline-event {
    padding-top: 0;
    border-top: 0;
    text-align: left;
  }

  .timeline-marker {
    position: absolute;
    top: 3px;
    left: -28px;
    margin-top: 0;
  }

  .timeline-kind {
    display: block;
    margin-bottom: 3px;
    color: var(--accent-dark);
    font-size: 0.7rem;
    font-weight: 750;
    text-transform: uppercase;
  }

  .personal-note {
    margin-top: 16px;
  }

  .contact-layout {
    gap: 38px;
  }

  .contact-list {
    min-width: 0;
  }
}

@media (max-width: 410px) {
  .brand {
    font-size: 0.88rem;
  }

  .site-nav {
    gap: 14px;
  }

  .site-nav a {
    font-size: 0.74rem;
  }

  .hero h1 {
    font-size: 2.15rem;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) 112px;
    gap: 22px 20px;
  }

  .portrait,
  .portrait img {
    width: 112px;
    height: 112px;
  }

  .native-name {
    display: block;
    margin: 8px 0 0;
    font-size: 0.58em;
  }

  .contact-list > div {
    grid-template-columns: 72px minmax(0, 1fr);
  }
}

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

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

@media print {
  .site-header,
  .contact-actions,
  .publication-links,
  .site-footer {
    display: none;
  }

  body,
  .page-section,
  .page-section--surface,
  .page-section--contact {
    background: #ffffff;
  }

  .hero,
  .page-section {
    min-height: 0;
    padding: 28px 0;
  }

  .publication {
    break-inside: avoid;
    box-shadow: none;
  }
}