/* ============ 5. Academic Rigour (LaTeX-like) ============ */
:root {
  --paper: #faf8f2;
  --card: #fffefb;
  --ink: #1c1c1c;
  --muted: #5f5a51;
  --line: #e3ddcf;
  --chip: #b9b2a2;
  --rule: #1c1c1c;
  --accent: #7a0019;
  --accent-soft: rgba(122, 0, 25, 0.055);
}
body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Serif 4", Georgia, "Times New Roman", "Noto Serif SC", "Songti SC", SimSun, serif;
  line-height: 1.8;
  font-size: 16px;
  counter-reset: section;
  text-rendering: optimizeLegibility;
}
html { scroll-padding-top: 24px; }
#app { max-width: 1080px; margin: 0 auto; padding: 52px 36px 100px; }
a { color: var(--accent); text-decoration: none; transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease; }
a:hover { text-decoration: underline; }
::selection { background: rgba(122, 0, 25, 0.16); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- header (letterhead, full width) ---- */
.hd { text-align: center; border-bottom: 3px double var(--rule); padding-bottom: 24px; margin-bottom: 40px; }
.hd-name-main { font-size: 2rem; font-variant: small-caps; letter-spacing: 0.08em; font-weight: 700; }
.hd-nav { display: flex; justify-content: center; gap: 10px 26px; margin-top: 14px; flex-wrap: wrap; }
.hd-nav a { color: var(--ink); font-size: 0.86rem; font-variant: small-caps; letter-spacing: 0.06em; }
.hd-nav a:hover { color: var(--accent); text-decoration: none; }
.hd-tools { margin-top: 12px; }
.lang-btn { font-size: 0.8rem; border: 1px solid var(--ink); padding: 2px 14px; color: var(--ink); font-variant: small-caps; letter-spacing: 0.05em; }
.lang-btn:hover { background: var(--ink); color: var(--paper); text-decoration: none; }

/* ---- two-column layout: sticky sidebar + scrolling main ---- */
.layout { display: flex; gap: 40px; align-items: flex-start; }
.side { flex: 0 0 230px; position: sticky; top: 32px; }
.main-col { flex: 1; min-width: 0; border-left: 1px solid var(--line); padding-left: 40px; }

/* portrait plate (lives in the sidebar) */
.hero-visual { background: var(--card); border: 1px solid var(--ink); padding: 8px 8px 10px; box-shadow: 3px 3px 0 var(--line); }
.avatar { display: block; width: 100%; aspect-ratio: 1; object-fit: cover; }
.badge { text-align: center; padding: 10px 6px 2px; }
.badge + .badge { border-top: 1px solid var(--line); margin-top: 8px; padding-top: 9px; }
.badge strong { display: block; font-size: 0.8rem; font-variant: small-caps; letter-spacing: 0.05em; }
.badge span { display: block; font-size: 0.72rem; color: var(--muted); margin-top: 2px; }

/* sidebar links: editorial hairline list */
.side .social { flex-direction: column; gap: 0; margin-top: 22px; }
.side .soc {
  display: block; text-align: center; padding: 9px 14px; font-size: 0.84rem;
  border: 0; border-bottom: 1px solid var(--line); background: transparent;
}
.side .soc:first-child { border-top: 1px solid var(--rule); }
.side .soc:last-child { border-bottom: 1px solid var(--rule); }
.side .soc:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }

/* ---- hero (main column) ---- */
.status {
  display: block; font-variant: small-caps; font-size: 0.82rem;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  padding: 5px 0; margin: 0 0 20px; letter-spacing: 0.14em; color: var(--muted);
}
.hero-title { font-size: 2.3rem; font-weight: 700; margin: 0 0 4px; line-height: 1.2; letter-spacing: -0.01em; }
.hero-title .accent { color: var(--ink); }
.hero-cn { display: block; font-size: 0.5em; color: var(--muted); font-weight: 400; margin-top: 8px; letter-spacing: 0.04em; }
.hero-sub { font-style: italic; color: var(--muted); font-size: 1.02rem; line-height: 1.55; margin: 0 0 16px; }
.hero-bio { margin: 0 0 20px; text-align: start; font-size: 0.97rem; }
.hero-bio::first-letter { font-weight: 700; }
.cta { display: flex; flex-wrap: wrap; gap: 14px; }
.btn { border: 1px solid var(--ink); padding: 7px 22px; font-family: inherit; font-size: 0.88rem; font-variant: small-caps; letter-spacing: 0.06em; color: var(--ink); background: transparent; }
.btn:hover { background: var(--ink); color: var(--paper); text-decoration: none; }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { color: var(--ink); }
.stats { display: flex; justify-content: center; gap: 36px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 14px 0; margin-bottom: 22px; }
.stat { text-align: center; }
.stat b { display: block; font-size: 1.5rem; }
.stat span { font-size: 0.78rem; color: var(--muted); font-variant: small-caps; }
.social { display: flex; flex-wrap: wrap; gap: 10px; font-size: 0.85rem; }

/* ---- sections: numbered, ruled ---- */
.sec { margin-top: 48px; }
.kicker { display: none; }
.sec-title {
  font-size: 1.34rem; font-variant: small-caps; letter-spacing: 0.06em;
  margin: 0 0 20px; counter-increment: section;
}
.sec-title::before { content: counter(section) ". "; color: var(--accent); }
.sec-title::after { content: ""; display: block; border-bottom: 1px solid var(--rule); margin-top: 8px; }

/* research interests */
.tags { display: flex; flex-wrap: wrap; gap: 6px 20px; margin-bottom: 14px; }
.tag { font-style: italic; font-size: 0.98rem; }
.tag::before { content: "• "; color: var(--accent); }
.skills { font-size: 0.85rem; color: var(--muted); display: block; }
.skill + .skill::before { content: " · "; }

/* publications: numbered reference list */
.cards { display: grid; gap: 0; counter-reset: paper; }
.card { position: relative; padding: 22px 10px 22px 36px; border-bottom: 1px solid var(--line); transition: background 0.2s ease; counter-increment: paper; }
.card:hover { background: var(--accent-soft); }
.card .venue { display: block; font-size: 0.78rem; font-variant: small-caps; letter-spacing: 0.09em; color: var(--accent); margin-bottom: 3px; }
.card.review .venue { font-style: italic; }
.card-title { font-size: 1.08rem; margin: 0 0 6px; font-weight: 700; line-height: 1.5; text-wrap: pretty; }
.card-title::before { content: "[" counter(paper) "]"; position: absolute; left: 4px; font-size: 0.88rem; font-weight: 400; color: var(--accent); line-height: 1.84; }
.authors { font-size: 0.9rem; margin: 2px 0; color: var(--ink); }
.journal { font-style: italic; font-size: 0.9rem; color: var(--muted); margin: 2px 0; }
.note { font-size: 0.88rem; color: var(--muted); margin: 6px 0 2px; }
.ctags { display: none; }
.card-links { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 0.85rem; margin-top: 10px; }
.card-links a { font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }
.more { font-size: 0.9rem; font-style: italic; margin-top: 16px; }

/* experience timeline */
.tl { display: grid; }
.tl-item { display: grid; grid-template-columns: 168px 1fr; gap: 6px 20px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.tl-item:first-child { padding-top: 0; }
.tl-item:last-child { border-bottom: 0; }
.tl-date { grid-column: 1; font-size: 0.8rem; color: var(--muted); font-variant: small-caps; text-align: right; letter-spacing: 0.04em; padding-top: 3px; }
.tl-item h3 { grid-column: 2; margin: 0 0 6px; font-size: 0.99rem; }
.tl-item ul { grid-column: 2; margin: 0; padding-left: 18px; font-size: 0.9rem; color: #35332e; }
.tl-item li { margin: 3px 0; }
.tl-item li::marker { color: var(--accent); }

/* education */
.edu-grid { display: grid; }
.edu-card { display: grid; grid-template-columns: 1fr auto; gap: 2px 18px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.edu-card:last-child { border-bottom: 0; }
.edu-card h3 { margin: 0; font-size: 0.99rem; grid-column: 1; }
.edu-card .degree { grid-column: 1; font-style: italic; font-size: 0.88rem; color: var(--muted); margin: 0; }
.edu-card .year { grid-column: 2; grid-row: 1 / span 2; align-self: center; font-size: 0.8rem; color: var(--muted); white-space: nowrap; font-variant: small-caps; letter-spacing: 0.03em; }
.edu-card .note { grid-column: 1; font-size: 0.8rem; color: var(--muted); margin: 2px 0 0; }
.mini-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 24px; font-size: 0.86rem; }
.mini-card { border: 1px solid var(--line); background: var(--card); padding: 12px 14px; }
.mini-card strong { display: block; font-variant: small-caps; letter-spacing: 0.05em; margin-bottom: 4px; }
.mini-card span { display: block; color: #35332e; font-size: 0.84rem; line-height: 1.6; }

/* contact */
.contact-card { text-align: center; border-top: 3px double var(--rule); padding-top: 30px; }
.contact-text { max-width: 58ch; margin: 0 auto 20px; }
.social.center { justify-content: center; margin-top: 18px; }
.ft { margin-top: 60px; padding-top: 20px; border-top: 1px solid var(--line); text-align: center; font-size: 0.84rem; color: var(--muted); font-style: italic; }

/* job-seeking lead-in (hidden unless content.json fills the fields) */
.seeking { border-left: 2px solid var(--accent); background: var(--accent-soft); padding: 14px 18px; margin: 0 0 24px; }
.seeking-text { margin: 0 0 12px; font-size: 0.95rem; }
.seeking .seeking-cta { display: inline-block; margin: 0 14px 10px 0; }
.seeking-roles { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.seeking-roles span { font-size: 0.8rem; color: var(--muted); font-variant: small-caps; letter-spacing: 0.04em; }

/* floating style switcher: match the paper theme */
.switcher { font-family: inherit; }
.sw-btn {
  border-radius: 0; border: 1px solid var(--ink); background: var(--paper); color: var(--ink);
  font-size: 12px; font-weight: 600; font-variant: small-caps; letter-spacing: 0.1em;
  box-shadow: 3px 3px 0 var(--line); backdrop-filter: none; padding: 8px 16px;
}
.sw-btn:hover { border-color: var(--accent); color: var(--accent); }
.sw-panel {
  border-radius: 0; border: 1px solid var(--ink); background: var(--paper);
  box-shadow: 4px 4px 0 var(--line); backdrop-filter: none; bottom: 48px;
}
.sw-title { color: var(--muted); letter-spacing: 0.14em; }
.sw-item { color: var(--ink); border-radius: 0; }
.sw-item:hover { background: var(--accent-soft); color: var(--accent); }
.sw-item.on { color: var(--accent); }
.sw-gallery { border-top: 1px solid var(--line); }

/* social chips (main column / contact area) */
.soc { border: 1px solid var(--chip); padding: 3px 13px; font-variant: small-caps; color: var(--ink); letter-spacing: 0.04em; background: var(--card); }
.soc:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); text-decoration: none; }

@media (max-width: 880px) {
  #app { padding: 40px 22px 80px; }
  .layout { flex-direction: column; gap: 36px; }
  .side { position: static; flex: none; width: 100%; }
  .main-col { width: 100%; border-left: 0; padding-left: 0; }
  .side .hero-visual { max-width: 230px; margin: 0 auto; }
  .side .social { flex-direction: row; flex-wrap: wrap; justify-content: center; gap: 10px; }
  .side .soc { display: inline-block; border: 1px solid var(--chip); border-bottom: 1px solid var(--chip); background: var(--card); padding: 3px 13px; }
  .side .soc:first-child { border-top: 1px solid var(--chip); }
  .side .soc:last-child { border-bottom: 1px solid var(--chip); }
  .side .soc:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }
  .hero-title { font-size: 1.9rem; }
  .mini-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  #app { padding: 28px 18px 80px; }
  .hd { margin-bottom: 28px; }
  .sec { margin-top: 36px; }
  .card { padding-right: 0; padding-left: 30px; }
  .card-title::before { left: 0; }
  .tl-item, .edu-card { grid-template-columns: 1fr; }
  .tl-item h3, .tl-item ul { grid-column: 1; }
  .edu-card .year { grid-column: 1; grid-row: auto; }
  .tl-date { text-align: left; padding-top: 0; }
}

@media print {
  body { background: #fff; font-size: 11pt; }
  #app { max-width: none; padding: 0; }
  .layout { display: block; }
  .side { position: static; margin-bottom: 20px; }
  .main-col { border-left: 0; padding-left: 0; }
  .switcher, .hd-tools, .seeking-cta { display: none; }
  a { color: var(--ink); text-decoration: none; }
  .card, .tl-item, .edu-card { break-inside: avoid; }
  .hero-visual { box-shadow: none; }
  .sec { margin-top: 28px; }
}