:root {
  --paper: #f7f6f2;
  --ink: #252d2a;
  --muted: #535c55;
  --accent: #8e4933;
  --line: #d6d8ce;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --body-size: 17px;
  --detail-size: 15px;
  --section-size: 32px;
  --heading-size: 20px;
}
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--header-height, 100px) + 16px); }
body { margin: 0; background: var(--paper); color: var(--ink); font: var(--body-size)/1.7 var(--sans); }
::selection { background: #dce2d0; }
a { color: inherit; text-decoration-color: #a9ada3; text-underline-offset: 4px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); text-decoration-color: var(--accent); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
img { max-width: 100%; height: auto; }
p { margin: 0 0 1.25em; }
strong { font-weight: 600; }
sup { line-height: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 400; }
button, summary { font: inherit; }
.skip-link { position: absolute; left: 24px; top: -100px; background: var(--ink); color: white; padding: 12px; z-index: 10; }
.skip-link:focus { top: 10px; }
.site-header, main, footer { max-width: 1080px; margin: auto; padding-left: 40px; padding-right: 40px; }
.site-header { position: sticky; top: 0; z-index: 5; background: var(--paper); display: flex; align-items: center; justify-content: space-between; gap: 28px; padding-top: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.wordmark { font: 600 28px var(--serif); text-decoration: none; letter-spacing: -2px; }
.wordmark span { color: var(--accent); }
nav { display: flex; gap: 22px; flex-wrap: wrap; }
nav a, .contact-links { font-size: var(--detail-size); }
nav a, .contact-links a { text-decoration: none; }
.hero { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 36px; align-items: start; padding: 48px 0; }
.hero-copy { grid-column: 2; grid-row: 1; }
.hero h1 { font: 56px/1.15 var(--serif); letter-spacing: -2px; }
.chinese-name { display: inline-block; font: 400 20px/1.5 var(--sans); letter-spacing: 2px; margin-left: 20px; color: var(--muted); vertical-align: middle; }
.name-meaning { max-width: 650px; margin-top: 22px; font-size: var(--detail-size); color: var(--muted); }
.name-meaning p { margin-bottom: 10px; }
.name-meaning p:last-child { margin-bottom: 0; }
.name-meaning strong { color: var(--ink); font-weight: 600; }
.research-summary { max-width: 650px; margin: 20px 0 0; font-size: var(--body-size); color: var(--ink); }
.contact-links { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 20px; }
.portrait { grid-column: 1; grid-row: 1; margin: 0; }
.portrait img { display: block; width: 180px; height: 180px; object-fit: cover; border-radius: 2px; }
.portrait figcaption { margin-top: 14px; font-size: var(--detail-size); line-height: 1.6; color: var(--muted); }
.chapter { border-top: 1px solid var(--line); padding: 36px 0 44px; }
.chapter-label { display: flex; align-items: baseline; gap: 16px; margin-bottom: 26px; }
.chapter-label > span { font-size: var(--detail-size); color: var(--accent); }
.chapter-label h2 { font: var(--section-size)/1.3 var(--serif); letter-spacing: -.5px; }
.chapter-body { min-width: 0; }
#about-me .chapter-body, #research-perspective .chapter-body { max-width: 72ch; }
.entry-date, .education-date, .news-date, .chapter-label > span { font-variant-numeric: tabular-nums; }
.chapter-body > p:last-child { margin-bottom: 0; }
.research-group { margin-bottom: 40px; scroll-margin-top: 28px; }
.research-group > h3, #teaching-and-service h3 { font: 600 var(--heading-size)/1.45 var(--sans); margin-bottom: 12px; }
.group-description { color: var(--muted); margin-bottom: 12px; }
.paper-box { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 30px; padding: 26px 0; border-bottom: 1px solid var(--line); align-items: center; }
.paper-box-image > div { display: flex; flex-direction: column; gap: 10px; }
.badge { font-size: var(--detail-size); color: var(--accent); }
.figure-link { display: block; padding: 12px; border: 1px solid #e3e3db; background: white; text-decoration: none; }
.figure-link:hover { border-color: var(--accent); }
.paper-box-image img { display: block; width: 100%; max-height: 190px; object-fit: contain; }
.paper-box-text { font-size: var(--detail-size); line-height: 1.65; color: var(--muted); }
.paper-box-text p { margin-bottom: 12px; }
.paper-title { font: 600 var(--heading-size)/1.45 var(--sans); margin-bottom: 12px; color: var(--ink); }
.paper-title a { text-decoration: none; }
.paper-summary { font-size: var(--body-size); color: var(--ink); }
.paper-box-text strong { color: var(--ink); }
.paper-box-text p:last-child strong { font-weight: 500; }
.paper-box-text p:last-child a { font-weight: 600; }
.paper-box-text p:last-child { margin-bottom: 0; }
.paper-box-text p:last-child a { display: inline-block; margin-right: 12px; }
.full-publications { margin: 0; }
.full-publications a { margin-left: 7px; }
.news-date { font-size: var(--detail-size); color: var(--muted); }
.news-item { padding-bottom: 20px; margin: 6px 0 22px; border-bottom: 1px solid var(--line); }
.news-with-image, .about-demo-flex { display: flex; align-items: center; gap: 24px; }
.news-with-image > div { flex: 1; min-width: 0; }
.news-with-image > a { flex: 0 0 140px; }
.about-demo-flex > a { min-width: 0; flex: 1; }
.about-demo-flex img { width: 100%; }
details { margin-top: 20px; }
summary { cursor: pointer; font-size: var(--detail-size); color: var(--muted); padding: 8px 0; }
details[open] summary { margin-bottom: 16px; }
#employment .chapter-body > p { padding-bottom: 22px; border-bottom: 1px solid var(--line); }
#employment .chapter-body > p:last-child { border: 0; padding-bottom: 0; }
#employment em { font-style: normal; color: var(--muted); }
#teaching-and-service h3 { margin-top: 30px; }
#teaching-and-service h3:first-child { margin-top: 0; }
#teaching-and-service ul { margin: 8px 0 24px; padding-left: 24px; columns: 2; column-gap: 30px; }
#teaching-and-service li { break-inside: avoid; padding: 3px 0; }
/* Keep dates and institution marks out of the flowing degree text. */
.education-entry { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.education-entry:first-child { padding-top: 0; }
.education-entry:last-child { padding-bottom: 0; border-bottom: 0; }
.education-entry .institution-logo { margin: 3px 0 0; }
.education-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 12px 24px; margin-bottom: 6px; }
.education-heading h3 { font: 600 var(--body-size)/1.6 var(--sans); }
.education-date { flex-shrink: 0; font-size: var(--detail-size); color: var(--muted); }
.education-details p { margin: 0; }
.education-note { color: var(--muted); }
.education-details p:last-child:not(:nth-child(2)) { margin-top: 4px; }
@media (max-width: 900px) {
  .education-heading { flex-direction: column; gap: 2px; }
}
@media (max-width: 560px) {
  .education-entry { grid-template-columns: 1fr; gap: 10px; }
}

.institution-logo { display: inline-block; width: 24px; height: 24px; object-fit: contain; vertical-align: middle; margin-right: 9px; }
.institution-logo[src*="pku"], .institution-logo[src*="amazon-wordmark"] { width: 72px; }
.institution-logo[src*="ut-austin"] { width: 64px; height: 30px; }
footer { border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; padding-top: 28px; padding-bottom: 28px; font-size: var(--detail-size); color: var(--muted); }
.footer-name { color: var(--ink); text-decoration: none; }
.email-hint { overflow-wrap: anywhere; scroll-margin-top: 30px; }
.email-hint:target { outline: 1px solid var(--line); outline-offset: 8px; }
footer > a:last-child { text-decoration: none; }
@media (max-width: 760px) {
  .site-header, main, footer { padding-left: 22px; padding-right: 22px; }
  .site-header { gap: 24px; align-items: flex-start; padding-top: 14px; padding-bottom: 14px; }
  nav { gap: 6px 16px; justify-content: flex-end; }
  nav a { padding: 3px 0; }
  .hero { grid-template-columns: 145px minmax(0, 1fr); gap: 26px; }
  .portrait img { width: 145px; height: 145px; }
  .hero h1 { font-size: 44px; }
  .chinese-name { display: block; margin: 8px 0 0; }
  .paper-box { grid-template-columns: 200px minmax(0, 1fr); gap: 24px; }
}
@media (max-width: 560px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 16px; padding: 30px 0; text-align: center; }
  .hero-copy, .portrait { display: contents; }
  .portrait img { grid-column: 1; grid-row: 1; justify-self: center; width: 128px; height: 128px; }
  .hero h1 { grid-column: 1; grid-row: 2; font-size: 40px; letter-spacing: -1px; }
  .hero .chinese-name { margin-top: 6px; }
  .portrait figcaption { grid-column: 1; grid-row: 3; justify-self: center; max-width: 300px; margin: 0; text-wrap: balance; }
  .hero .contact-links { grid-column: 1; grid-row: 6; justify-content: center; margin: 0; gap: 6px 18px; }
  .research-summary { grid-column: 1; grid-row: 5; margin: 0; text-align: left; }
  .name-meaning { grid-column: 1; grid-row: 4; margin: 8px 0 0; text-align: left; }
  .chapter { padding: 30px 0 36px; }
  .chapter-label { margin-bottom: 22px; }
  .paper-box { grid-template-columns: 1fr; gap: 18px; }
  .paper-box-image { max-width: 320px; width: 100%; }
  .paper-box-image img { max-height: 165px; }
  #teaching-and-service ul { columns: 1; }
  .news-with-image, .about-demo-flex { flex-direction: column; align-items: start; }
  .news-with-image > a { flex: auto; max-width: 180px; }
  .email-hint { order: 3; width: 100%; }
}
@media (max-width: 360px) {
  .site-header, main, footer { padding-left: 18px; padding-right: 18px; }
  .hero h1 { font-size: 36px; }
}
@media print {
  body { background: white; }
  .site-header, .contact-links, footer { display: none; }
  main { padding: 0; }
  .hero { padding: 20px 0; }
  .paper-box { break-inside: avoid; }
  a { color: inherit; }
}

.workshop-list { margin: 0 0 26px; }
.workshop-row { display: grid; grid-template-columns: 48px 290px minmax(0, 1fr); gap: 16px; margin-bottom: 18px; }
.workshop-location { color: var(--muted); }
@media (max-width: 760px) {
  .workshop-row { grid-template-columns: 48px minmax(0, 1fr); gap: 4px 16px; margin-bottom: 24px; }
  .workshop-row > span:last-child { grid-column: 2; }
}

.experience-entry { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.experience-entry:first-child { padding-top: 0; }
.experience-entry:last-child { padding-bottom: 0; border: 0; }
.experience-entry .institution-logo { margin: 3px 0 0; }
.entry-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 12px 24px; margin-bottom: 6px; }
.entry-heading h3 { font: 600 var(--body-size)/1.6 var(--sans); }
.entry-date { color: var(--muted); font-size: var(--detail-size); flex-shrink: 0; }
.experience-details p, .dated-entry p { margin: 0; }
.entry-note { color: var(--muted); }
.experience-details .entry-project { margin-top: 10px; }
.experience-details .entry-outcome { margin-top: 10px; font-size: var(--detail-size); font-weight: 500; }
.dated-entry { display: grid; grid-template-columns: 155px minmax(0, 1fr); gap: 24px; padding: 0 0 18px; }
.dated-entry:last-child { padding-bottom: 0; }
@media (max-width: 900px) { .entry-heading { flex-direction: column; gap: 2px; } }
@media (max-width: 560px) {
  .experience-entry { grid-template-columns: 1fr; gap: 10px; }
  .dated-entry { grid-template-columns: 1fr; gap: 4px; padding-bottom: 22px; }
}