/* ==========================================================================
   The Lin Lab · site-v3 — "Three Signals" design system
   Palette: cool near-white, near-black ink, blue-led accents
     --c1 cobalt   → Bioelectronics & BCI          (primary)
     --c2 verdant  → Functional–molecular mapping  (small doses)
     --c3 ember    → AI agents & closed-loop        (small doses)
   Type: Inter Tight (display) / Inter (text); PingFang + Source Han CJK
   Corners stay tight and hovers stay flat — the type carries the hierarchy.
   ========================================================================== */

:root{
  --paper:#FAFBFC;
  --paper-deep:#F2F4F7;
  --ink:#101418;
  --ink-soft:#5B646E;
  --ink-faint:#8A929C;
  --line:#E6E9ED;
  --line-soft:#EFF1F4;
  /* Blue carries the accent work; green and amber appear only in small
     doses — pillar dots, icons, category rules. */
  --c1:#1B44C8; --c1-soft:#E8EDFC;
  --c2:#0B6B4F; --c2-soft:#E2F0EB;
  --c3:#B4490C; --c3-soft:#FAEBE1;
  --dark:#0F1317;
  --dark-2:#171B21;
  --display:"Inter Tight","Inter","PingFang SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --sans:"Inter","PingFang SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --wrap:1160px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
:lang(zh-CN) body, body:lang(zh-CN){letter-spacing:.01em}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
p a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--line)}
p a:hover{text-decoration-color:var(--c1)}
::selection{background:var(--c1);color:#fff}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* A grotesque needs more weight and tighter tracking than the serif it
   replaced to hold the same presence at a smaller size. */
h1,h2,h3,.serif{font-family:var(--display);font-weight:650;line-height:1.14;letter-spacing:-.021em}

/* ---------- eyebrows, buttons, small ui ---------- */
.eyebrow{
  font-size:12px;font-weight:650;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-faint);display:flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";display:inline-block;width:22px;height:2px;background:var(--c1)}
.eyebrow.e2::before{background:var(--c2)}
.eyebrow.e3::before{background:var(--c3)}
.eyebrow.plain::before{display:none}

.button{
  display:inline-block;padding:12px 22px;border-radius:3px;
  background:var(--ink);color:var(--paper);font-weight:600;font-size:15px;
  border:1.5px solid var(--ink);transition:.18s;
}
.button:hover{background:var(--c1);border-color:var(--c1);color:#fff}
.button.secondary{background:transparent;color:var(--ink)}
.button.secondary:hover{background:var(--ink);color:var(--paper)}
.button-row{display:flex;flex-wrap:wrap;gap:12px}
.text-link{font-weight:600;border-bottom:2px solid var(--line);padding-bottom:2px;transition:.15s}
.text-link:hover{border-color:var(--c1);color:var(--c1)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  display:flex;align-items:center;gap:28px;
  padding:14px 28px;
  background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-soft);
}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{
  width:38px;height:38px;border:1.5px solid var(--ink);border-radius:4px;
  display:grid;place-items:center;background:var(--paper);
}
.brand-mark svg{width:26px;height:16px}
.brand b{font-family:var(--display);font-size:18px;font-weight:600;display:block;line-height:1.1}
.brand small{font-size:11.5px;color:var(--ink-faint);letter-spacing:.08em;text-transform:uppercase}
.header-affil{
  display:flex;align-items:center;line-height:0;
  padding-left:18px;border-left:1px solid var(--line);
}
/* 34px is the floor for the bilingual lockup: below it the "WESTLAKE
   UNIVERSITY" line under 西湖大學 stops resolving. Still clears the 38px
   brand mark, so header height is unchanged. */
.header-affil img{height:34px;width:auto}
/* The lockup beside the brand carries the affiliation, so the sub-line stands
   down to avoid saying it twice — the hero states the school. On mobile the
   lockup is hidden and the sub-line names the university again. */
.brand-uni,.brand-school{display:none}
.site-header nav{margin-left:auto;display:flex;gap:4px}
.site-header nav a{
  padding:8px 14px;border-radius:3px;font-size:14.5px;font-weight:550;color:var(--ink-soft);
}
.site-header nav a:hover{color:var(--ink);background:var(--paper-deep)}
.site-header nav a[aria-current="page"]{color:var(--ink);background:var(--paper-deep);font-weight:650}
.language-toggle{
  font:inherit;font-size:13.5px;font-weight:650;cursor:pointer;
  border:1.5px solid var(--line);background:transparent;color:var(--ink-soft);
  border-radius:3px;padding:7px 14px;transition:.15s;
}
.language-toggle:hover{border-color:var(--ink);color:var(--ink)}
.menu-toggle{display:none;font:inherit;font-weight:650;background:none;border:1.5px solid var(--line);border-radius:3px;padding:7px 14px;cursor:pointer}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line-soft)}
.hero .wrap{position:relative;padding-top:84px;padding-bottom:72px}
/* Institutional lockup: height-constrained only, never recolored or faded, so
   the official asset renders as its guidelines require. */
.hero-kicker{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-bottom:34px}
.hero-affil{display:inline-block;line-height:0}
.hero-affil img{height:46px;width:auto}
.hero-school{
  font-size:12px;font-weight:650;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-faint);padding-left:20px;border-left:1px solid var(--line);
}
@media(max-width:520px){
  .hero-affil img{height:38px}
  .hero-school{padding-left:0;border-left:0}
}
.hero-words{display:flex;flex-direction:column;gap:1px}
/* Down again from clamp(34px,4.2vw,58px). The three words are the framing,
   not the message — the keywords below say what the lab actually builds, and
   they were losing the page to this. */
.hero-words .w{
  font-family:var(--display);font-weight:680;letter-spacing:-.03em;
  font-size:clamp(29px,3.2vw,44px);line-height:1.12;
}
.hero-words .w small{
  display:inline-block;font-family:var(--sans);font-weight:600;font-size:12px;
  letter-spacing:.13em;text-transform:uppercase;margin-left:12px;color:var(--ink-faint);
  vertical-align:middle;position:relative;top:-.5em;
}
/* The headline stays near-black and the pillar colour moves to the small
   label — the palette is blue-led, with green and amber in small doses only. */
.hero-words .w{color:var(--ink)}
.w1 small{color:var(--c1)} .w2 small{color:var(--c2)} .w3 small{color:var(--c3)}
.hero-sub{
  max-width:640px;margin-top:36px;font-size:19px;line-height:1.7;color:var(--ink-soft);
}
/* Concrete deliverables under the three abstract pillar words. The dot colour
   ties each back to its pillar, and each links to that research program. */
.hero-keys{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hk{
  font-size:15.5px;font-weight:600;padding:10px 18px 10px 15px;border-radius:3px;
  background:#fff;border:1px solid var(--line);color:var(--ink);transition:.16s;
}
.hk::before{
  content:"";display:inline-block;width:8px;height:8px;border-radius:50%;
  background:var(--hkc);margin-right:10px;vertical-align:1px;
}
.hk1{--hkc:var(--c1)} .hk2{--hkc:var(--c2)} .hk3{--hkc:var(--c3)}
.hk:hover{border-color:var(--hkc);color:var(--ink)}
/* Must follow the base rules above — same specificity, so source order wins.
   At full size each keyword claimed its own row on a phone and pushed the
   buttons off the first screen; trimmed, they pair up. */
@media(max-width:520px){
  .hero-keys{gap:8px;margin-top:22px}
  .hk{font-size:12.5px;padding:6px 12px 6px 10px}
  .hk::before{width:6px;height:6px;margin-right:7px}
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-top:28px}
.hero-note{font-size:14px;color:var(--ink-faint)}
/* Below ~520px the English pair needs 369px against 342px, so it wrapped to
   two ragged rows of different widths. Full width instead: same stack, but it
   reads as a decision and the tap targets get bigger. Scoped away from
   Chinese, whose labels are short enough that both buttons and the note still
   share one row — stacking them there would be a downgrade. Must follow the
   base rule above: equal specificity, so source order decides. */
@media(max-width:520px){
  html:not([lang="zh-CN"]) .hero-actions{gap:10px}
  html:not([lang="zh-CN"]) .hero-actions .button{flex:1 1 100%;text-align:center}
  html:not([lang="zh-CN"]) .hero-note{width:100%;margin-top:4px}
}
.hero-wave{
  position:absolute;right:-40px;top:50%;transform:translateY(-50%);
  width:min(46vw,560px);opacity:.9;pointer-events:none;
}
@media(max-width:960px){.hero-wave{position:static;transform:none;width:100%;margin-top:40px;opacity:.85}}

/* waveform divider strip */
.wave-strip{display:block;width:100%;height:46px;color:var(--line)}

/* ---------- pillars ---------- */
.section{padding:88px 0}
.section-head{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:end;margin-bottom:48px}
.section-head h2{font-size:clamp(30px,3.6vw,44px)}
.section-head p{color:var(--ink-soft);font-size:16.5px}
@media(max-width:820px){.section-head{grid-template-columns:1fr;gap:16px}}

.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:920px){.pillars{grid-template-columns:1fr}}
.pillar-card{
  background:#fff;border:1px solid var(--line-soft);border-radius:4px;
  padding:30px 26px 28px;display:flex;flex-direction:column;gap:14px;
  position:relative;overflow:hidden;transition:.2s;
}
.pillar-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--pc)}
/* Flat hover: the border picks up the pillar colour instead of the card
   lifting off the page. */
.pillar-card:hover{border-color:var(--pc)}
.pillar-card .p-icon{width:52px;height:52px;border-radius:4px;background:var(--pcs);display:grid;place-items:center}
.pillar-card .p-icon svg{width:30px;height:30px;color:var(--pc)}
.pillar-card .p-num{position:absolute;top:22px;right:24px;font-family:var(--display);font-size:15px;color:var(--ink-faint)}
.pillar-card h3{font-size:23px}
.pillar-card p{color:var(--ink-soft);font-size:15.5px;flex:1}
.pillar-card .text-link{align-self:flex-start;font-size:14.5px}
.pc1{--pc:var(--c1);--pcs:var(--c1-soft)}
.pc2{--pc:var(--c2);--pcs:var(--c2-soft)}
.pc3{--pc:var(--c3);--pcs:var(--c3-soft)}

.align-strip{
  margin-top:22px;display:grid;grid-template-columns:56px 1fr auto;gap:22px;align-items:center;
  background:var(--ink);color:var(--paper);border-radius:4px;padding:24px 28px;
}
.align-strip svg{width:44px;height:44px;color:var(--c3)}
.align-strip p{font-size:15.5px;color:#C9CCD3}
.align-strip p b{color:#fff}
.align-strip .text-link{color:#fff;border-color:#3A3F49;white-space:nowrap}
.align-strip .text-link:hover{border-color:var(--c3);color:var(--c3)}
@media(max-width:820px){.align-strip{grid-template-columns:1fr;gap:12px}}

/* ---------- featured work ---------- */
.band{background:var(--paper-deep);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:920px){.features{grid-template-columns:1fr}}
.feature{
  background:#fff;border:1px solid var(--line-soft);border-radius:4px;overflow:hidden;
  display:flex;flex-direction:column;transition:.2s;
}
.feature:hover{border-color:var(--ink)}
.feature .thumb{aspect-ratio:4/3;overflow:hidden;background:var(--paper-deep)}
.feature .thumb img{width:100%;height:100%;object-fit:cover}
.feature .body{padding:22px 22px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
.venue-tag{
  align-self:flex-start;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  padding:4px 10px;border-radius:3px;background:var(--ink);color:var(--paper);
}
.venue-tag.v1{background:var(--c1)} .venue-tag.v2{background:var(--c2)} .venue-tag.v3{background:var(--c3)}
.venue-tag.ghost{background:transparent;color:var(--ink-soft);border:1px solid var(--line)}
.feature h3{font-size:19px;line-height:1.3}
.feature p{font-size:14.5px;color:var(--ink-soft);flex:1}

.more-work{margin-top:34px;border-top:1px solid var(--line);padding-top:8px}
.more-row{
  display:grid;grid-template-columns:110px 1fr auto;gap:18px;align-items:baseline;
  padding:16px 4px;border-bottom:1px solid var(--line-soft);transition:.15s;
}
.more-row:hover{background:#fff}
.more-row .mr-venue{font-size:13px;font-weight:650;color:var(--ink-faint)}
.more-row h4{font-family:var(--display);font-weight:560;font-size:17.5px;line-height:1.35}
.more-row .mr-link{font-size:14px;font-weight:600;color:var(--ink-faint);white-space:nowrap}
.more-row:hover .mr-link{color:var(--c1)}
@media(max-width:720px){.more-row{grid-template-columns:1fr;gap:4px}}

/* ---------- news ---------- */
.news-list{border-top:1px solid var(--line)}
.news-item{
  display:grid;grid-template-columns:130px 1fr;gap:24px;
  padding:20px 4px;border-bottom:1px solid var(--line-soft);
}
.news-item time{font-size:13.5px;font-weight:650;color:var(--ink-faint);padding-top:2px}
.news-item p{font-size:16px;color:var(--ink)}
.news-item p .nw{font-weight:650}
@media(max-width:720px){.news-item{grid-template-columns:1fr;gap:2px}}

/* ---------- dark PI / CTA band ---------- */
.dark-band{background:var(--dark);color:#EDF0F3}
.dark-band .eyebrow{color:#8B909B}
.pi-grid{display:grid;grid-template-columns:300px 1fr 280px;gap:48px;align-items:start}
@media(max-width:1000px){.pi-grid{grid-template-columns:1fr;gap:32px}}
.pi-photo{border-radius:4px;overflow:hidden;border:1px solid #2A2E36}
.pi-photo img{width:100%;aspect-ratio:1/1.08;object-fit:cover}
.pi-grid h2{font-size:36px;margin:10px 0 14px}
.pi-grid p{color:#B9BDC5;font-size:16px}
.pi-links{display:flex;gap:20px;margin-top:22px;flex-wrap:wrap}
.pi-links a{font-weight:600;border-bottom:2px solid #333842;padding-bottom:2px}
.pi-links a:hover{border-color:var(--c3);color:#fff}
.staff-preview{display:grid;grid-template-columns:80px 1fr auto;gap:20px;align-items:center;margin-top:44px;padding-top:28px;border-top:1px solid #2A2E36}
.staff-preview img{width:80px;height:auto;border-radius:4px}
.staff-preview h3{font-size:22px;margin-bottom:6px}
.staff-preview p{color:#B9BDC5;font-size:15.5px}
.staff-preview-link{font-size:15px;font-weight:600;border-bottom:2px solid #333842;padding-bottom:2px}
.staff-preview:hover .staff-preview-link{border-color:var(--c3);color:#fff}
@media(max-width:560px){.staff-preview{grid-template-columns:80px minmax(0,1fr)}.staff-preview-link{grid-column:2;justify-self:start}}
.join-cta{
  background:var(--dark-2);border:1px solid #262B34;border-radius:4px;padding:28px 26px;
}
.join-cta h3{font-size:22px;margin-bottom:10px}
.join-cta p{font-size:14.5px}
.join-cta .button{margin-top:18px;background:var(--paper);border-color:var(--paper);color:var(--ink)}
.join-cta .button:hover{background:var(--c3);border-color:var(--c3);color:#fff}

/* ---------- page intro (interior pages) ---------- */
.page-intro{padding:76px 0 56px}
.page-intro h1{font-size:clamp(38px,5vw,60px);margin:18px 0 20px;max-width:820px}
.page-intro > .wrap > p, .page-intro .lede{max-width:680px;font-size:18px;color:var(--ink-soft)}
.methods{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.methods span{
  font-size:13.5px;font-weight:600;padding:7px 14px;border-radius:3px;
  background:#fff;border:1px solid var(--line);color:var(--ink-soft);
}

/* ---------- research page ---------- */
.program{
  display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;
  padding:72px 0;border-top:1px solid var(--line);
}
.program:nth-child(even) .prog-media{order:-1}
@media(max-width:900px){.program{grid-template-columns:1fr;gap:28px}.program:nth-child(even) .prog-media{order:0}}
.prog-media{border-radius:4px;overflow:hidden;border:1px solid var(--line-soft);background:#fff}
.prog-media img{width:100%;aspect-ratio:4/3;object-fit:cover}
.prog-copy h2{font-size:clamp(26px,3vw,36px);margin:14px 0 16px}
.prog-copy p{color:var(--ink-soft);font-size:16.5px;margin-bottom:14px}
.prog-pubs{margin-top:20px;border-top:1px solid var(--line-soft);padding-top:6px}
.prog-pubs a{display:block;padding:9px 0;border-bottom:1px solid var(--line-soft);font-size:14.5px;font-weight:550;color:var(--ink-soft)}
.prog-pubs a b{color:var(--ink);font-weight:650}
.prog-pubs a:hover{color:var(--c1)}
.northstar{background:var(--dark);color:#EDF0F3;padding:88px 0}
.northstar h2{font-size:clamp(28px,3.6vw,44px);max-width:640px;margin:14px 0 20px}
.northstar p{color:#B9BDC5;max-width:640px;font-size:17px}

/* ---------- people ---------- */
.person{display:grid;grid-template-columns:320px 1fr;gap:52px;align-items:start}
@media(max-width:860px){.person{grid-template-columns:1fr;gap:26px}}
.person .photo{border-radius:4px;overflow:hidden;border:1px solid var(--line-soft)}
.person .photo img{width:100%;aspect-ratio:1/1.12;object-fit:cover}
.person h2{font-size:38px;margin:12px 0 6px}
.person .role{font-size:15.5px;font-weight:600;color:var(--c1);margin-bottom:16px}
.person p{color:var(--ink-soft);margin-bottom:14px}
.person-staff{grid-template-columns:220px 1fr;align-items:center}
.person-staff .photo{width:220px;max-width:100%}
.person-staff .photo img{height:auto;aspect-ratio:auto;object-fit:contain}
.person-staff h2{font-size:30px}
#peiyue-shen{scroll-margin-top:110px}
@media(max-width:860px){.person-staff{grid-template-columns:1fr}}
.timeline{margin-top:26px;border-top:1px solid var(--line);padding-top:6px}
.timeline > div{display:grid;grid-template-columns:110px 1fr;gap:16px;padding:11px 0;border-bottom:1px solid var(--line-soft);font-size:15px}
.timeline b{font-family:var(--display);font-weight:600;color:var(--ink)}
.timeline span{color:var(--ink-soft)}
.recruit-card{
  background:#fff;border:1px solid var(--line-soft);border-radius:4px;
  padding:46px 44px;position:relative;overflow:hidden;
}
.recruit-card::before{content:"";position:absolute;inset:0 auto 0 0;width:5px;
  background:linear-gradient(180deg,var(--c1),var(--c2),var(--c3))}
.recruit-card h2{font-size:clamp(26px,3vw,36px);margin:12px 0 14px}
.recruit-card p{color:var(--ink-soft);max-width:640px;margin-bottom:22px}

/* ---------- publications ---------- */
.pub-category{padding:8px 0 40px}
.pub-category-head{display:flex;align-items:baseline;gap:20px;margin:36px 0 8px;border-bottom:2px solid var(--ink);padding-bottom:12px}
.pub-category-head h2{font-size:26px}
.pub-category-head p{color:var(--ink-faint);font-size:14.5px}
.pub-category.k1 .pub-category-head{border-color:var(--c3)}
.pub-category.k2 .pub-category-head{border-color:var(--c2)}
.pub-category.k3 .pub-category-head{border-color:var(--c1)}
.pub-category.k4 .pub-category-head{border-color:var(--ink)}
.publication{
  display:grid;grid-template-columns:120px 1fr;gap:24px;
  padding:24px 0;border-bottom:1px solid var(--line-soft);align-items:start;
}
.publication img{width:120px;height:90px;object-fit:cover;border-radius:3px;border:1px solid var(--line-soft)}
.publication h3{font-size:19px;line-height:1.35;margin-bottom:6px}
.publication .authors{font-size:13.5px;color:var(--ink-faint);line-height:1.55;margin-bottom:8px}
.publication .authors strong{color:var(--ink);font-weight:650}
.publication .venue{font-size:14px;font-weight:650;color:var(--ink-soft);margin-bottom:6px}
.publication .venue i{
  font-style:normal;display:inline-block;vertical-align:1px;
  font-size:11.5px;font-weight:700;letter-spacing:.05em;
  padding:2.5px 10px;border-radius:3px;
  background:var(--c1-soft);color:var(--c1);
}
.publication .venue i.cover{background:var(--c3-soft);color:var(--c3)}
.publication{
  border-radius:3px;transition:background .18s;
  padding-left:16px;padding-right:16px;margin-left:-16px;margin-right:-16px;
}
.publication:hover{background:#fff}
.pub-link{font-size:14px;font-weight:650;color:var(--c1)}
.pub-link:hover{text-decoration:underline}
@media(max-width:680px){.publication{grid-template-columns:1fr}.publication img{width:100%;height:150px}}

/* ---------- join ---------- */
.join-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-bottom:22px}
@media(max-width:820px){.join-grid{grid-template-columns:1fr}}
.join-card{background:#fff;border:1px solid var(--line-soft);border-radius:4px;padding:30px 28px}
.join-card h2{font-size:22px;margin-bottom:14px}
.join-card ul{list-style:none}
.join-card li{padding:9px 0 9px 26px;border-bottom:1px solid var(--line-soft);position:relative;color:var(--ink-soft);font-size:15.5px}
.join-card li::before{content:"";position:absolute;left:2px;top:17px;width:10px;height:2.5px;background:var(--c1)}
.join-card.jc2 li::before{background:var(--c2)}
.contact-box{
  background:var(--dark);color:#EDF0F3;border-radius:4px;padding:46px 44px;
}
.contact-box h2{font-size:28px;margin-bottom:14px}
.contact-box p{color:#B9BDC5;max-width:640px;margin-bottom:12px}
.contact-box a{color:#fff;font-weight:650;border-bottom:2px solid #333842}
.contact-box a:hover{border-color:var(--c3)}

/* ---------- values strip ---------- */
.values{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:820px){.values{grid-template-columns:1fr}}
.value{border-top:2px solid var(--ink);padding-top:16px}
.value h3{font-size:19px;margin-bottom:8px}
.value p{font-size:14.5px;color:var(--ink-soft)}

/* ---------- footer ---------- */
.site-footer{
  border-top:1px solid var(--line);margin-top:40px;
  padding:44px 28px 52px;display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:32px;
  max-width:calc(var(--wrap) + 56px);margin-left:auto;margin-right:auto;
}
@media(max-width:820px){.site-footer{grid-template-columns:1fr}}
.footer-brand{font-family:var(--display);font-weight:600;font-size:20px}
.site-footer p{font-size:14px;color:var(--ink-faint);margin-top:6px}
.site-footer a:hover{color:var(--c1)}

/* ---------- mobile nav ---------- */
@media(max-width:860px){
  .site-header{flex-wrap:wrap;gap:10px;padding:12px 16px}
  .menu-toggle{display:block;margin-left:auto}
  .site-header nav{display:none;width:100%;flex-direction:column;gap:2px}
  .site-header.menu-open nav{display:flex}
  .site-header nav a{padding:11px 12px}
  /* Menu + language buttons need the row; the brand names the university in
     text instead, and the hero still carries the lockup. */
  .header-affil{display:none}
  .brand-uni{display:inline}
  .brand-school{display:none}
}
/* At 375px the brand plus both buttons overflowed by ~11px and dropped the
   language toggle onto its own line. Tighten the gutters so they share a row. */
@media(max-width:430px){
  .site-header{padding-left:14px;padding-right:14px;gap:8px}
  .menu-toggle,.language-toggle{padding:7px 11px}
  .brand small{font-size:11px;letter-spacing:.06em}
}

/* ==========================================================================
   Chinese typography
   Inter Tight carries no CJK glyphs, so Chinese headings fall through to
   PingFang / Source Han Sans. Those faces are already dense and need neutral
   tracking and more leading — the tight negative tracking tuned for the Latin
   grotesque makes them collide.
   ========================================================================== */
html[lang="zh-CN"] body{line-height:1.8}
html[lang="zh-CN"] h1,
html[lang="zh-CN"] h2,
html[lang="zh-CN"] h3,
html[lang="zh-CN"] .serif{letter-spacing:0;line-height:1.35;font-weight:600}
html[lang="zh-CN"] .hero-words .w{letter-spacing:.005em;line-height:1.25;font-weight:600}
/* uppercase does nothing for CJK, and wide tracking scatters the glyphs */
html[lang="zh-CN"] .eyebrow{letter-spacing:.08em}
html[lang="zh-CN"] .venue-tag{letter-spacing:.04em}
html[lang="zh-CN"] .publication .authors{line-height:1.7}

/* ---------- scroll reveal (enhancement only; JS adds .reveal) ---------- */
.reveal{
  opacity:0;transform:translateY(16px);
  transition:opacity .65s cubic-bezier(.22,.61,.36,1),transform .65s cubic-bezier(.22,.61,.36,1);
}
.reveal.is-in{opacity:1;transform:none}

/* ---------- focus & motion accessibility ---------- */
:focus-visible{outline:2.5px solid var(--c1);outline-offset:3px;border-radius:4px}
.dark-band :focus-visible,.northstar :focus-visible,
.contact-box :focus-visible,.align-strip :focus-visible{outline-color:#fff}
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:100;
  background:var(--ink);color:var(--paper);font-weight:650;font-size:14px;
  padding:10px 18px;border-radius:0 0 10px 10px;transition:top .18s;
}
.skip-link:focus{top:0}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}