:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-2: #f2f4f7;
  --ink: #172033;
  --muted: #5d687c;
  --line: #d9dee7;
  --accent: #235786;
  --accent-soft: #eaf1f7;
  --serif: Georgia, "Times New Roman", "Noto Serif", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --shell: 1040px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #111722;
  --surface: #171f2c;
  --surface-2: #1b2432;
  --ink: #edf1f7;
  --muted: #a7b0bf;
  --line: #303b4b;
  --accent: #82add3;
  --accent-soft: #1e3042;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 16px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.58;
  text-rendering: optimizeLegibility;
  transition: background-color .2s ease, color .2s ease;
}
a { color: var(--accent); text-underline-offset: 2px; }
button, input { font: inherit; }
button { color: inherit; }
img { display: block; max-width: 100%; }
.shell { width: min(calc(100% - 40px), var(--shell)); margin-inline: auto; }
.skip-link { position: fixed; top: 12px; left: 16px; z-index: 100; padding: 8px 12px; background: var(--accent); color: #fff; border-radius: 3px; opacity: 0; pointer-events: none; transform: translateY(-150%); }
.skip-link:focus { opacity: 1; pointer-events: auto; transform: none; }
.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; }

.hero { display: grid; grid-template-columns: 1fr 170px; gap: 56px; align-items: center; padding-block: 48px; border-bottom: 1px solid var(--line); }
.section-index, .card-kicker { margin: 0; color: var(--accent); font-size: .7rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }
.hero h1 { margin: 0 0 4px; font-family: var(--serif); font-size: clamp(2.4rem, 5vw, 3.35rem); font-weight: 700; line-height: 1.12; letter-spacing: -.02em; }
.chinese-name { margin-left: 10px; color: var(--muted); font-family: var(--serif); font-size: .58em; font-weight: 400; letter-spacing: .02em; }
.hero-role { margin: 0 0 9px; color: var(--muted); font-size: .92rem; line-height: 1.5; }
.hero-contact { margin: 0 0 14px; font-size: .84rem; }
.hero-contact span { margin-right: 8px; color: var(--muted); font-size: .72rem; font-weight: 600; text-transform: uppercase; }
.hero-contact a { font-weight: 600; }
.hero-lede { max-width: 700px; margin: 0; color: var(--muted); font-size: .92rem; }
.hero-lede strong { color: var(--ink); font-weight: 600; }

.profile-card { width: 170px; margin: 0; }
.portrait-wrap { overflow: hidden; border: 1px solid var(--line); border-radius: 3px; background: var(--surface); padding: 5px; }
.portrait-wrap img { width: 100%; aspect-ratio: 1; object-fit: cover; filter: saturate(.82); }

.section { padding-block: 56px; }
.section-heading { display: grid; grid-template-columns: 180px 1fr; gap: 28px; align-items: baseline; margin-bottom: 28px; padding-bottom: 12px; border-bottom: 2px solid var(--ink); }
.section-heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(1.55rem, 3vw, 2rem); font-weight: 700; line-height: 1.2; letter-spacing: -.015em; }
.about-grid { display: grid; grid-template-columns: 1.18fr .82fr; gap: 56px; }
.about-copy p { margin: 0 0 12px; color: var(--muted); }
.about-copy .lead { color: var(--ink); font-family: var(--serif); font-size: 1.15rem; line-height: 1.5; }
.about-copy a { text-decoration-thickness: 1px; }
.focus-grid { display: grid; gap: 8px; }
.focus-card, .focus-card.wide { min-height: 0; display: grid; grid-template-columns: 30px 140px 1fr; gap: 10px; align-items: baseline; padding: 10px 12px; border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 2px; background: var(--surface); color: var(--ink); }
.focus-card.accent { background: var(--surface); color: var(--ink); border-color: var(--line); border-left-color: var(--accent); }
.focus-number { color: var(--muted); font-size: .68rem; font-weight: 600; }
.focus-card h3 { margin: 0; font-size: .84rem; }
.focus-card p, .focus-card.accent p, .focus-card.accent .focus-number { margin: 0; color: var(--muted); font-size: .76rem; line-height: 1.45; }

.section-tint { background: var(--surface-2); border-block: 1px solid var(--line); }
.timeline { border-top: 1px solid var(--line); }
.timeline-item { display: grid; grid-template-columns: 150px 1fr; gap: 28px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.timeline-item time { color: var(--muted); font-size: .75rem; font-weight: 600; }
.timeline-item.current time { color: var(--accent); }
.timeline-item h3 { display: inline; margin: 0; font-size: .86rem; }
.timeline-item p { display: inline; margin: 0 0 0 8px; color: var(--muted); font-size: .78rem; }
.timeline-item p::before { content: "— "; }

.publication-heading { grid-template-columns: 180px 1fr; }
.publication-heading > div { display: contents; }
.year-group { display: grid; grid-template-columns: 74px 1fr; gap: 22px; margin-bottom: 26px; }
.year-label { margin: 7px 0 0; color: var(--accent); font-family: var(--serif); font-size: 1.2rem; font-weight: 700; }
.year-publications { border-top: 1px solid var(--line); }
.publication { display: grid; grid-template-columns: 1fr auto; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.publication-main { min-width: 0; }
.publication-title { max-width: 790px; margin: 0 0 4px; font-family: var(--serif); font-size: .9rem; font-weight: 700; line-height: 1.4; }
.publication-authors, .publication-venue { margin: 0; color: var(--muted); font-size: .7rem; line-height: 1.45; }
.publication-authors .me { color: var(--ink); font-weight: 700; }
.publication-venue { margin-top: 2px; }
.venue-short { color: var(--accent); font-weight: 700; }
.publication-tags { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 4px; min-width: 110px; }
.publication-tags span { height: fit-content; padding: 3px 5px; border: 1px solid var(--line); border-radius: 2px; color: var(--muted); font-size: .56rem; font-weight: 600; letter-spacing: .03em; text-transform: uppercase; }
.empty-state { padding: 26px; border: 1px dashed var(--line); color: var(--muted); text-align: center; }

.section-dark { background: var(--surface-2); color: var(--ink); border-top: 1px solid var(--line); }
.section-dark .section-index { color: var(--accent); }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.service-card { min-height: 0; display: block; padding: 16px; border: 1px solid var(--line); border-radius: 3px; background: var(--surface); color: var(--ink); }
.service-card .card-kicker, .cve-card .card-kicker { color: var(--muted); }
.service-card h3 { margin: 4px 0 14px; font-family: var(--serif); font-size: 1.15rem; font-weight: 700; line-height: 1.3; }
.service-card dl { margin: 0; }
.service-card dl div { display: grid; grid-template-columns: 84px 1fr; padding: 7px 0; border-top: 1px solid var(--line); }
.service-card dt { color: var(--muted); font-size: .68rem; }
.service-card dd { margin: 0; font-size: .72rem; }
.honors-card ul { margin: 0; padding: 0; list-style: none; }
.honors-card li { display: grid; grid-template-columns: 38px 1fr; gap: 7px; padding: 6px 0; border-top: 1px solid var(--line); color: var(--ink); font-size: .7rem; }
.honors-card li span { color: var(--muted); }
.cve-card { background: var(--surface); color: var(--ink); border-color: var(--line); }
.cve-links { display: flex; flex-wrap: wrap; gap: 5px; }
.cve-links a { padding: 4px 6px; border: 1px solid var(--line); border-radius: 2px; color: var(--accent); font-size: .66rem; text-decoration: none; }
.cve-links a:hover { background: var(--accent-soft); border-color: var(--accent); }

.site-footer { padding-block: 28px; background: var(--surface); color: var(--ink); border-top: 1px solid var(--line); }
.footer-grid { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.footer-grid p { margin: 0; color: var(--muted); font-size: .68rem; }
.copyright { text-align: right; }

@media (max-width: 800px) {
  .about-grid { grid-template-columns: 1fr; gap: 24px; }
  .service-grid { grid-template-columns: 1fr 1fr; }
  .cve-card { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .hero { grid-template-columns: 1fr 112px; gap: 20px; padding-block: 32px; }
  .profile-card { width: 112px; }
  .hero h1 { font-size: 2.15rem; }
  .chinese-name { display: block; margin: 2px 0 0; font-size: .55em; }
  .hero-role { font-size: .8rem; }
  .hero-lede { grid-column: 1 / -1; font-size: .82rem; }
  .section { padding-block: 40px; }
  .section-heading, .publication-heading { display: block; margin-bottom: 20px; }
  .section-index { margin-bottom: 5px; }
  .focus-card, .focus-card.wide { grid-template-columns: 24px 110px 1fr; }
  .timeline-item { grid-template-columns: 105px 1fr; gap: 12px; }
  .timeline-item h3, .timeline-item p { display: block; }
  .timeline-item p { margin-left: 0; }
  .timeline-item p::before { content: ""; }
  .year-group { grid-template-columns: 54px 1fr; gap: 12px; }
  .publication { grid-template-columns: 1fr; gap: 7px; }
  .publication-tags { justify-content: flex-start; }
  .service-grid { grid-template-columns: 1fr; }
  .cve-card { grid-column: auto; }
  .footer-grid { flex-direction: column; align-items: flex-start; gap: 8px; }
  .copyright { text-align: left; }
}

@media (max-width: 420px) {
  .focus-card, .focus-card.wide { grid-template-columns: 22px 1fr; }
  .focus-card p { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}