/* =========================================================
   Tingting Yan — Editorial Serif design system
   ========================================================= */

:root{
  --scarlet:#cc0000;
  --scarlet-deep:#a00000;
  --ink:#1a1a1a;
  --ink-soft:#33312e;
  --gray:#5b5b5b;
  --gray-light:#8a857e;
  --paper:#fbfaf8;
  --paper-2:#f3f0ea;
  --surface:#ffffff;
  --rule:#e2ddd4;
  --max:1080px;
  --serif:'Newsreader','Iowan Old Style','Palatino Linotype',Palatino,Georgia,'Times New Roman',serif;
  --display:'Fraunces','Iowan Old Style','Palatino Linotype',Palatino,Georgia,serif;
  --ease:cubic-bezier(.2,.7,.2,1);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:84px;}
body{
  margin:0;
  font-family:var(--serif);
  font-optical-sizing:auto;
  color:var(--ink);
  background:var(--paper);
  font-size:18px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;}
a{color:var(--scarlet);text-decoration:none;transition:color .2s var(--ease);}
a:hover{color:var(--scarlet-deep);}
.muted{color:var(--gray);}
em{font-style:italic;}

/* ---------- Header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(251,250,248,.86);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--rule);
}
.site-header::after{
  content:"";position:absolute;left:0;bottom:-1px;height:2px;width:100%;
  background:linear-gradient(90deg,var(--scarlet) 0 22%,transparent 22%);
}
.header-inner{
  max-width:var(--max);margin:0 auto;padding:.85rem 1.5rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
}
.wordmark{
  font-family:var(--display);font-weight:600;font-size:1.18rem;letter-spacing:.01em;
  color:var(--ink);white-space:nowrap;
}
.wordmark:hover{color:var(--ink);}
.nav{display:flex;gap:1.4rem;flex-wrap:wrap;}
.nav a{
  font-family:var(--serif);font-size:.86rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-soft);position:relative;padding:.2rem 0;
}
.nav a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:0;background:var(--scarlet);
  transition:width .28s var(--ease);
}
.nav a:hover,.nav a.active{color:var(--scarlet);}
.nav a.active::after,.nav a:hover::after{width:100%;}

.nav-toggle{display:none;flex-direction:column;gap:4px;background:none;border:0;cursor:pointer;padding:6px;}
.nav-toggle span{width:24px;height:2px;background:var(--ink);transition:.3s var(--ease);}

/* ---------- Hero ---------- */
.hero{max-width:var(--max);margin:0 auto;padding:5rem 1.5rem 3rem;}
.hero-grid{
  display:grid;grid-template-columns:300px 1fr;gap:3.2rem;align-items:start;
}
.hero-portrait{position:relative;}
.hero-portrait img{
  width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center top;
  border-radius:3px;filter:grayscale(8%) contrast(1.02);
  box-shadow:0 18px 45px -22px rgba(0,0,0,.5);
}
.portrait-rule{
  position:absolute;left:-14px;top:24px;bottom:24px;width:3px;background:var(--scarlet);
}
.eyebrow{
  font-size:.8rem;letter-spacing:.16em;text-transform:uppercase;color:var(--scarlet);
  margin:0 0 .6rem;font-weight:500;
}
.hero-name{
  font-family:var(--display);font-weight:500;font-size:clamp(2.8rem,6vw,4.4rem);
  line-height:.98;letter-spacing:-.015em;margin:0;color:var(--ink);
}
.name-rule{display:block;width:84px;height:3px;background:var(--scarlet);margin:1.1rem 0 1.3rem;}
.hero-titles{font-size:1.12rem;line-height:1.5;margin:0 0 1.4rem;color:var(--ink-soft);}
.hero-titles .muted{font-size:.96rem;}
.hero-bio{font-size:1.08rem;color:var(--ink-soft);max-width:42em;margin:0 0 1.5rem;}
.hero-links{font-size:1rem;margin:0 0 1.6rem;}
.hero-links a{color:var(--ink);border-bottom:1px solid transparent;}
.hero-links a:hover{color:var(--scarlet);border-bottom-color:var(--scarlet);}
.dot{color:var(--gray-light);margin:0 .55rem;}

.btn{
  display:inline-block;font-family:var(--serif);font-size:.92rem;letter-spacing:.04em;
  color:#fff;background:var(--scarlet);padding:.66rem 1.3rem;border-radius:2px;
  border:1px solid var(--scarlet);transition:all .22s var(--ease);
}
.btn:hover{background:var(--scarlet-deep);color:#fff;transform:translateY(-1px);box-shadow:0 10px 22px -12px rgba(204,0,0,.7);}
.btn.small{padding:.5rem 1rem;font-size:.85rem;}

/* ---------- Education ---------- */
.education{margin-top:3.4rem;padding-top:2.2rem;border-top:1px solid var(--rule);}
.edu-label{
  font-family:var(--serif);font-size:.82rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--scarlet);margin:0 0 1.1rem;font-weight:600;
}
.edu-list{list-style:none;margin:0;padding:0;display:grid;gap:1.1rem;}
.edu-list li{display:grid;grid-template-columns:84px 1fr;gap:1.2rem;align-items:baseline;}
.edu-year{font-family:var(--display);font-size:1.15rem;color:var(--scarlet);font-weight:500;}
.edu-body strong{font-weight:600;}

/* ---------- Sections ---------- */
.section{max-width:var(--max);margin:0 auto;padding:4.6rem 1.5rem;}
.section.alt{
  max-width:none;background:var(--paper-2);
  border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);
}
.section.alt > *{max-width:var(--max);margin-left:auto;margin-right:auto;}
.section.alt .section-head,
.section.alt .section-lead,
.section.alt .pub-list,
.section.alt .pub-full,
.section.alt .toggle-btn,
.section.alt .service-grid,
.section.alt .personal-grid{max-width:var(--max);margin-left:auto;margin-right:auto;}

.section-head{display:flex;align-items:baseline;gap:1rem;margin-bottom:1.8rem;
  border-bottom:1px solid var(--rule);padding-bottom:1rem;}
.section-num{
  font-family:var(--display);font-size:1rem;color:var(--scarlet);font-weight:600;
  letter-spacing:.05em;
}
.section-num.light{color:var(--scarlet);}
.section-title{
  font-family:var(--display);font-weight:500;font-size:clamp(1.7rem,3.4vw,2.5rem);
  letter-spacing:-.01em;margin:0;color:var(--ink);
}
.section-lead{color:var(--gray);font-size:1.02rem;margin:-.4rem 0 2rem;max-width:46em;}

/* ---------- Research ---------- */
.theme{
  font-family:var(--display);font-style:italic;font-weight:400;
  font-size:clamp(1.3rem,2.8vw,1.85rem);line-height:1.4;color:var(--ink);
  border-left:3px solid var(--scarlet);margin:0 0 2.6rem;padding:.2rem 0 .2rem 1.5rem;
  max-width:38em;
}
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.6rem 2rem;}
.topic h3{
  font-family:var(--display);font-weight:500;font-size:1.2rem;margin:0 0 .4rem;color:var(--ink);
  position:relative;padding-top:.9rem;
}
.topic h3::before{content:"";position:absolute;top:0;left:0;width:32px;height:2px;background:var(--scarlet);}
.topic p{margin:0;font-size:.98rem;color:var(--ink-soft);}

/* ---------- Publications ---------- */
.pub-list{list-style:none;margin:0 0 1.6rem;padding:0;counter-reset:pub;}
.pub-list li{
  position:relative;padding:1rem 0 1rem 2.4rem;border-bottom:1px solid var(--rule);
}
.pub-list.selected li,.pub-full .pub-list li{counter-increment:pub;}
.pub-list li::before{
  content:counter(pub);position:absolute;left:0;top:1.05rem;
  font-family:var(--display);font-size:.82rem;color:var(--gray-light);
}
.pub-authors{display:block;font-weight:600;color:var(--ink);}
.pub-title{display:block;color:var(--ink-soft);margin:.1rem 0;}
.pub-venue{display:block;font-size:.94rem;color:var(--gray);}
.pub-venue em{color:var(--ink-soft);}
.badge{
  display:inline-block;font-size:.72rem;letter-spacing:.04em;text-transform:uppercase;
  color:var(--scarlet);border:1px solid var(--scarlet);border-radius:2px;
  padding:.1rem .5rem;margin:.3rem .4rem 0 0;font-family:var(--serif);
  line-height:1.55;max-width:100%;
}
/* FT50 / UTD24 ranking tags */
.tags{white-space:nowrap;}
.tag{
  display:inline-block;font-family:var(--serif);font-size:.64rem;font-weight:600;
  letter-spacing:.09em;text-transform:uppercase;padding:.08rem .42rem;border-radius:2px;
  margin-left:.35rem;vertical-align:middle;line-height:1.5;
}
.tag.ft{background:var(--scarlet);color:#fff;}
.tag.utd{background:transparent;color:var(--ink);border:1px solid var(--ink);}
.tag.scm{background:var(--ink);color:#fff;}
.pub-legend{
  display:flex;gap:1.4rem;flex-wrap:wrap;align-items:center;
  font-size:.86rem;color:var(--gray);margin:-.6rem 0 2rem;
  padding-bottom:1.2rem;border-bottom:1px solid var(--rule);
}
.pub-legend .tag{margin-left:0;margin-right:.35rem;}

.pub-group{
  font-family:var(--display);font-weight:600;font-size:1.15rem;color:var(--ink);
  margin:2.4rem 0 .4rem;padding-bottom:.3rem;letter-spacing:.02em;
}
.pub-group.featured{margin-top:.4rem;}
.pub-group::after{content:"";display:block;width:44px;height:2px;background:var(--scarlet);margin-top:.5rem;}

.toggle-btn{
  font-family:var(--serif);font-size:.9rem;letter-spacing:.06em;text-transform:uppercase;
  background:none;border:1px solid var(--ink);color:var(--ink);
  padding:.6rem 1.4rem;border-radius:2px;cursor:pointer;transition:all .22s var(--ease);
}
.toggle-btn:hover{background:var(--ink);color:var(--paper);}

/* ---------- Teaching ---------- */
.teach-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;}
.teach-block h3{
  font-family:var(--display);font-weight:500;font-size:1.18rem;margin:0 0 .8rem;
  padding-bottom:.5rem;border-bottom:2px solid var(--scarlet);display:inline-block;
}
.teach-block ul{list-style:none;margin:0;padding:0;}
.teach-block li{padding:.45rem 0;border-bottom:1px solid var(--rule);font-size:.98rem;}

.cases{margin-top:2.8rem;padding-top:2rem;border-top:1px solid var(--rule);}
.cases-head{
  font-family:var(--display);font-weight:500;font-size:1.18rem;margin:0 0 1rem;
  padding-bottom:.5rem;border-bottom:2px solid var(--scarlet);display:inline-block;
}
.case-list{list-style:none;margin:0;padding:0;counter-reset:case;}
.case-list li{
  position:relative;padding:.85rem 0 .85rem 2.4rem;border-bottom:1px solid var(--rule);
  counter-increment:case;
}
.case-list li::before{
  content:counter(case);position:absolute;left:0;top:.9rem;
  font-family:var(--display);font-size:.82rem;color:var(--gray-light);
}

/* ---------- Service ---------- */
.leadership{
  background:var(--surface);border:1px solid var(--rule);border-left:3px solid var(--scarlet);
  border-radius:3px;padding:1.6rem 1.8rem;margin-bottom:2.6rem;
  box-shadow:0 14px 36px -28px rgba(0,0,0,.45);
}
.leadership h3{
  font-family:var(--display);font-weight:600;font-size:1.25rem;margin:0 0 .5rem;color:var(--ink);
}
.leadership p{margin:0 0 .8rem;color:var(--ink-soft);max-width:54em;}
.leadership-links{display:flex;gap:.8rem;flex-wrap:wrap;margin:0;}
.btn.ghost{background:transparent;color:var(--scarlet);}
.btn.ghost:hover{background:var(--scarlet);color:#fff;}

.service-grid{display:grid;grid-template-columns:1fr 1fr;gap:2.6rem;}
.service-col h3{
  font-family:var(--display);font-weight:500;font-size:1.2rem;margin:0 0 .9rem;color:var(--ink);
}
.service-col h3.mt{margin-top:2rem;}
.service-list{list-style:none;margin:0;padding:0;}
.service-list li{
  padding:.55rem 0 .55rem 1.1rem;border-bottom:1px solid var(--rule);position:relative;font-size:.98rem;
}
.service-list li::before{content:"";position:absolute;left:0;top:1.05rem;width:5px;height:5px;background:var(--scarlet);border-radius:50%;}
.service-list li strong{color:var(--ink);}

/* ---------- Awards ---------- */
.award-list{list-style:none;margin:0;padding:0;}
.award-list li{
  display:grid;grid-template-columns:96px 1fr;gap:1.4rem;align-items:baseline;
  padding:.85rem 0;border-bottom:1px solid var(--rule);
}
.award-year{font-family:var(--display);font-size:1.05rem;color:var(--scarlet);font-weight:600;letter-spacing:.02em;}
.award-body{color:var(--ink-soft);}

/* ---------- Personal ---------- */
.personal-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.6rem;}
.personal h3{
  font-family:var(--display);font-weight:500;font-size:1.3rem;margin:0 0 .5rem;color:var(--ink);
  position:relative;padding-top:1rem;
}
.personal h3::before{content:"";position:absolute;top:0;left:0;width:36px;height:2px;background:var(--scarlet);}
.personal p{margin:0;color:var(--ink-soft);}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#e8e4dd;margin-top:0;padding:4rem 1.5rem 2.2rem;}
.footer-inner{max-width:var(--max);margin:0 auto;}
.footer-head{display:flex;align-items:baseline;gap:1rem;margin-bottom:2rem;
  border-bottom:1px solid #3a3733;padding-bottom:1rem;}
.site-footer .section-num{color:var(--scarlet);}
.site-footer .section-title{color:#fff;}
.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:2.4rem;}
.footer-name{font-family:var(--display);font-size:1.3rem;color:#fff;margin:0 0 .5rem;}
.site-footer .muted{color:#a9a39a;}
.site-footer a{color:#fff;border-bottom:1px solid transparent;}
.site-footer a:hover{color:#fff;border-bottom-color:var(--scarlet);}
.footer-links{margin:.8rem 0;}
.footer-links .dot{color:#6a655d;}
.copyright{margin-top:2.6rem;padding-top:1.4rem;border-top:1px solid #3a3733;font-size:.85rem;color:#8a857e;}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease);}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
  html{scroll-behavior:auto;}
}

/* ---------- Responsive ---------- */
@media (max-width:860px){
  .nav{
    position:fixed;inset:64px 0 auto 0;background:var(--paper);
    flex-direction:column;gap:0;padding:.5rem 1.5rem 1.2rem;
    border-bottom:1px solid var(--rule);
    transform:translateY(-130%);transition:transform .32s var(--ease);box-shadow:0 18px 30px -20px rgba(0,0,0,.4);
  }
  .nav.open{transform:translateY(0);}
  .nav a{padding:.7rem 0;border-bottom:1px solid var(--rule);width:100%;}
  .nav-toggle{display:flex;}
  .nav-toggle.open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
  .nav-toggle.open span:nth-child(2){opacity:0;}
  .nav-toggle.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
  .hero-grid{grid-template-columns:1fr;gap:2rem;}
  .hero-portrait{max-width:280px;}
  .portrait-rule{left:-10px;}
  .topic-grid,.teach-grid,.personal-grid{grid-template-columns:1fr;}
  .service-grid,.footer-grid{grid-template-columns:1fr;gap:1.8rem;}
}
@media (min-width:561px) and (max-width:860px){
  .topic-grid,.personal-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:560px){
  body{font-size:17px;}
  .hero{padding-top:3rem;}
  .award-list li{grid-template-columns:64px 1fr;gap:.9rem;}
  .edu-list li{grid-template-columns:60px 1fr;gap:.8rem;}
}

/* =========================================================
   ENHANCEMENT PASS v2 — atmosphere, depth, motion, mobile
   ========================================================= */

/* Warm paper canvas with a soft scarlet glow + fine grain overlay */
body{
  background:
    radial-gradient(1100px 620px at 88% -8%, rgba(204,0,0,.07), transparent 60%),
    radial-gradient(900px 600px at -10% 12%, rgba(204,0,0,.04), transparent 55%),
    var(--paper);
  background-attachment:fixed;
  overflow-x:clip; /* clip (not hidden) so position:sticky header keeps working */
}
.hero{overflow:hidden;}
body::before{
  content:"";position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.5;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
}
main,.site-footer{position:relative;z-index:2;}
/* header keeps its sticky positioning; its own z-index:50 already sits above the grain overlay */
.site-header{z-index:50;}

/* Scroll progress bar */
.scroll-progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--scarlet),var(--scarlet-deep));
  box-shadow:0 0 10px rgba(204,0,0,.5);transition:width .08s linear;
}

/* Header polish */
.site-header{box-shadow:0 1px 0 rgba(0,0,0,.02);}

/* ---------- Hero depth ---------- */
.hero{position:relative;}
.hero::before{
  content:"";position:absolute;top:-40px;right:-40px;width:340px;height:340px;z-index:-1;
  background:radial-gradient(circle at 30% 30%,rgba(204,0,0,.10),transparent 70%);
  border-radius:50%;filter:blur(8px);pointer-events:none;
}
.hero-portrait img{
  transition:transform .5s var(--ease),filter .5s var(--ease),box-shadow .5s var(--ease);
}
.hero-portrait::after{
  content:"";position:absolute;right:-14px;bottom:-14px;left:14px;top:34px;z-index:-1;
  border:2px solid var(--scarlet);border-radius:3px;opacity:.5;transition:all .5s var(--ease);
}
.hero-portrait:hover img{transform:translate(-3px,-3px);filter:grayscale(0%) contrast(1.04);
  box-shadow:0 26px 60px -26px rgba(0,0,0,.6);}
.hero-portrait:hover::after{right:-10px;bottom:-10px;opacity:.85;}

.eyebrow{position:relative;display:inline-block;}

/* ---------- Stats band ---------- */
.stats-band{
  background:
    radial-gradient(700px 300px at 80% 0%, rgba(204,0,0,.22), transparent 60%),
    linear-gradient(180deg,#171717,#222020);
  color:#f3efe9;padding:2.6rem 1.5rem;border-top:3px solid var(--scarlet);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.stats-inner{
  max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:repeat(4,1fr);
  gap:1.4rem 1rem;
}
.stat{text-align:center;padding:.4rem .6rem;position:relative;}
.stat + .stat::before{
  content:"";position:absolute;left:0;top:18%;height:64%;width:1px;background:rgba(255,255,255,.14);
}
.stat-num{
  display:block;font-family:var(--display);font-weight:600;line-height:1;
  font-size:clamp(2.4rem,5vw,3.3rem);
  color:#fff;letter-spacing:-.01em;
  text-shadow:0 2px 18px rgba(204,0,0,.35);
}
.stat-num::after{content:"";}
.stat-label{
  display:block;margin-top:.55rem;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;
  color:#c9c2b8;line-height:1.35;
}

/* ---------- Research topic cards ---------- */
.topic{
  background:var(--surface);border:1px solid var(--rule);border-radius:4px;
  padding:1.4rem 1.4rem 1.5rem;overflow:hidden;position:relative;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.topic::after{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--scarlet);
  transform:scaleY(0);transform-origin:top;transition:transform .35s var(--ease);
}
.topic:hover{transform:translateY(-4px);box-shadow:0 22px 44px -28px rgba(0,0,0,.45);border-color:#d8d2c7;}
.topic:hover::after{transform:scaleY(1);}
.topic h3{padding-top:0;}
.topic h3::before{display:none;}

/* ---------- Section number as a refined chip ---------- */
.section-num{
  display:inline-flex;align-items:center;justify-content:center;min-width:2.1rem;height:2.1rem;
  border:1.5px solid var(--scarlet);border-radius:50%;font-size:.82rem;
}
.site-footer .footer-head .section-num{border-color:var(--scarlet);}

/* ---------- Buttons: subtle sheen ---------- */
.btn{position:relative;overflow:hidden;}
.btn::after{
  content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;
  background:linear-gradient(120deg,transparent,rgba(255,255,255,.35),transparent);
  transform:skewX(-20deg);transition:left .6s var(--ease);
}
.btn:hover::after{left:140%;}

/* ---------- Cards: leadership, teach, personal hover ---------- */
.leadership{transition:transform .3s var(--ease),box-shadow .3s var(--ease);}
.leadership:hover{transform:translateY(-3px);box-shadow:0 24px 50px -30px rgba(0,0,0,.5);}
.personal{
  background:var(--surface);border:1px solid var(--rule);border-radius:4px;padding:1.4rem;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.personal:hover{transform:translateY(-4px);box-shadow:0 22px 44px -28px rgba(0,0,0,.4);}
.personal h3{padding-top:0;}
.personal h3::before{top:-.1rem;}

/* ---------- Publication rows hover ---------- */
.pub-list li{transition:background .25s var(--ease),padding-left .25s var(--ease);border-radius:3px;}
.pub-list li:hover{background:rgba(204,0,0,.035);}
.pub-list.selected li:hover{padding-left:2.7rem;}

/* ---------- Back to top ---------- */
.to-top{
  position:fixed;right:1.3rem;bottom:1.3rem;z-index:55;width:46px;height:46px;border:0;cursor:pointer;
  border-radius:50%;background:var(--scarlet);color:#fff;display:grid;place-items:center;
  box-shadow:0 12px 26px -12px rgba(204,0,0,.8);
  opacity:0;visibility:hidden;transform:translateY(12px) scale(.9);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s,background .2s;
}
.to-top.show{opacity:1;visibility:visible;transform:none;}
.to-top:hover{background:var(--scarlet-deep);transform:translateY(-2px);}

/* ---------- Reveal: gentle scale for cards ---------- */
.topic.reveal,.personal.reveal,.stat.reveal{transform:translateY(22px) scale(.98);}
.topic.reveal.in,.personal.reveal.in,.stat.reveal.in{transform:none;}

/* =========================================================
   MOBILE-FRIENDLY REFINEMENTS
   ========================================================= */
@media (max-width:860px){
  .stats-inner{grid-template-columns:1fr 1fr;gap:1.6rem 1rem;}
  .stat:nth-child(odd)::before,.stat + .stat::before{display:none;}
  .stat{padding:.6rem .4rem;border-bottom:1px solid rgba(255,255,255,.08);}
  .hero::before{width:220px;height:220px;top:-20px;right:-20px;}
  /* larger tap targets in nav */
  .nav a{font-size:1rem;letter-spacing:.06em;}
}
@media (max-width:560px){
  .section{padding:3.2rem 1.25rem;}
  .stats-band{padding:2rem 1.25rem;}
  .stats-inner{grid-template-columns:1fr 1fr;gap:1.3rem .8rem;}
  .stat-num{font-size:2.3rem;}
  .stat-label{font-size:.72rem;letter-spacing:.07em;}
  .hero-grid{gap:1.6rem;}
  .hero-portrait{max-width:230px;margin:0 auto;}
  .hero-portrait::after{left:10px;right:-10px;bottom:-10px;top:24px;}
  .hero-text{text-align:left;}
  .hero-links{line-height:2.2;}
  .hero-links a{padding:.15rem 0;}
  .theme{font-size:1.18rem;padding-left:1.1rem;}
  .section-head{gap:.7rem;}
  .to-top{right:1rem;bottom:1rem;width:42px;height:42px;}
  .pub-list li{padding-left:0;}
  .pub-list li::before{display:none;}
  .pub-list.selected li:hover{padding-left:0;}
  .leadership{padding:1.3rem 1.2rem;}
  .leadership-links .btn{flex:1 1 auto;text-align:center;}
  .footer-grid{gap:1.6rem;}
}
@media (max-width:380px){
  .stats-inner{grid-template-columns:1fr;}
  .stat + .stat{border-top:1px solid rgba(255,255,255,.08);padding-top:1.1rem;}
}

/* ---------- Language toggle (EN / 中文) ---------- */
.header-actions{display:flex;align-items:center;gap:.7rem;}
.lang-toggle{
  background:none;border:1px solid var(--rule);border-radius:999px;cursor:pointer;
  font-family:var(--serif);font-size:.82rem;letter-spacing:.03em;color:var(--gray);
  padding:.3rem .75rem;display:inline-flex;align-items:center;gap:.4rem;line-height:1;white-space:nowrap;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.lang-toggle:hover{border-color:var(--scarlet);box-shadow:0 6px 16px -10px rgba(204,0,0,.5);}
.lang-opt{color:var(--gray-light);transition:color .2s var(--ease);}
.lang-opt.active{color:var(--scarlet);font-weight:600;}
.lang-sep{color:var(--rule);}
:lang(zh) body,
html[lang="zh-Hans"] body{
  /* let the system Chinese serif lead, keeping the editorial feel */
  font-family:'Newsreader',"Songti SC","STSong","SimSun","Noto Serif SC",'Iowan Old Style',Georgia,serif;
}
@media (max-width:560px){
  .lang-toggle{font-size:.78rem;padding:.26rem .6rem;}
  .header-actions{gap:.5rem;}
}