/* =========================================================
   Yichun Li — Academic Homepage
   Design: museum-grade editorial. Ivory paper · ink · plum · gold leaf.
   Type: Cormorant Garamond (display) · EB Garamond (body) · Jost (labels)
   ========================================================= */

:root{
  --paper:#F7F3EB;
  --paper-2:#F1EADD;
  --paper-deep:#ECE3D3;
  --ink:#211A1A;
  --ink-soft:#5A4F4B;
  --ink-faint:#8A7E76;
  --plum:#5A2A3B;
  --plum-deep:#37182332;
  --plum-solid:#3C1B28;
  --gold:#9C7836;
  --gold-bright:#C2A05B;
  --seal:#A8362B;
  --line:rgba(33,26,26,.16);
  --line-soft:rgba(33,26,26,.09);
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}

/* ---- bilingual (EN default; html.lang-zh shows Chinese) ---- */
.zh{display:none}
html.lang-zh .en{display:none}
html.lang-zh .zh{display:revert}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:"EB Garamond",Georgia,"Songti SC",serif;
  font-size:19px;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{display:block;max-width:100%}
picture{display:contents}
a{color:inherit;text-decoration:none}

/* ---- shared text utilities ---- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px}
.serif{font-family:"Cormorant Garamond",Georgia,serif}
.eyebrow{
  font-family:"Jost",sans-serif;
  font-size:12.5px;font-weight:400;
  letter-spacing:.34em;text-transform:uppercase;
  color:var(--gold);
}
.rule{width:54px;height:1px;background:var(--gold);opacity:.85}
.fleuron{
  display:flex;align-items:center;justify-content:center;gap:18px;
  color:var(--gold);font-size:15px;letter-spacing:.3em;
}
.fleuron::before,.fleuron::after{
  content:"";width:60px;height:1px;background:var(--line);
}

/* =======================  NAV  ======================= */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(247,243,235,.86);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line-soft);
}
.nav__inner{
  max-width:var(--maxw);margin:0 auto;padding:18px 40px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:12px}
.brand__seal{width:30px;height:30px;flex:0 0 auto}
.brand__name{
  font-family:"Jost",sans-serif;font-weight:400;
  font-size:14px;letter-spacing:.32em;text-transform:uppercase;
  color:var(--ink);
}
.menu{display:flex;gap:36px;align-items:center}
.menu a{
  font-family:"Jost",sans-serif;font-size:13px;font-weight:300;
  letter-spacing:.18em;text-transform:uppercase;color:var(--ink-soft);
  position:relative;padding:4px 0;transition:color .35s var(--ease);
}
.menu a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:1px;
  background:var(--gold);transition:width .4s var(--ease);
}
.menu a:hover{color:var(--ink)}
.menu a:hover::after,.menu a.is-active::after{width:100%}
.menu a.is-active{color:var(--ink)}

/* language toggle */
.navright{display:flex;align-items:center;gap:30px}
.langtoggle{display:inline-flex;align-items:stretch;border:1px solid var(--line);border-radius:2px;overflow:hidden}
.langtoggle button{
  font-family:"Jost",sans-serif;font-size:11px;font-weight:400;letter-spacing:.16em;
  padding:7px 13px;background:transparent;border:none;color:var(--ink-faint);
  cursor:pointer;transition:background .35s var(--ease),color .35s var(--ease);line-height:1;
}
.langtoggle button:hover{color:var(--ink)}
.langtoggle button.on{background:var(--plum-solid);color:#F7F3EB}
.langtoggle .div{width:1px;background:var(--line);align-self:stretch}

/* =======================  HERO  ======================= */
.hero{
  position:relative;min-height:84vh;display:flex;align-items:center;
  overflow:hidden;background:#2a1620;
}
.hero__img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  object-position:72% 40%;filter:saturate(.96) brightness(.78);
}
.hero__veil{
  position:absolute;inset:0;
  background:
    linear-gradient(90deg, rgba(28,14,20,.82) 0%, rgba(34,18,26,.55) 46%, rgba(40,22,30,.18) 100%),
    linear-gradient(0deg, rgba(20,10,14,.55), rgba(20,10,14,0) 40%);
}
.hero__inner{position:relative;z-index:2;width:100%;padding:64px 0}
.hero .eyebrow{color:var(--gold-bright)}
.hero__name{
  font-weight:300;letter-spacing:.01em;color:#FBF6EC;
  font-size:clamp(62px,9vw,128px);line-height:.96;margin:18px 0 6px;
}
.hero__cn{
  font-family:"Noto Serif SC","Songti SC",serif;
  color:#E9D8B8;font-size:clamp(18px,2vw,24px);
  letter-spacing:.5em;margin-bottom:26px;opacity:.92;
}
.hero__tag{
  font-family:"Cormorant Garamond",serif;font-style:italic;
  color:#EADFCD;font-size:clamp(20px,2.4vw,29px);max-width:30ch;
  line-height:1.5;font-weight:400;
}
.hero__rule{width:70px;height:1px;background:var(--gold-bright);margin:30px 0}
.hero__scroll{
  position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;
  font-family:"Jost",sans-serif;font-size:11px;letter-spacing:.3em;
  text-transform:uppercase;color:#E9D8B8;opacity:.7;
}

/* =======================  SECTION SHELL  ======================= */
.section{padding:118px 0}
.section--paper2{background:var(--paper-2)}
.section__head{text-align:center;margin-bottom:64px}
.section__head .eyebrow{display:block;margin-bottom:16px}
.section__title{
  font-weight:400;font-size:clamp(36px,4.4vw,54px);line-height:1.05;color:var(--ink);
}
.section__title em{font-style:italic;color:var(--plum)}

/* =======================  BIO  ======================= */
.bio{display:grid;grid-template-columns:0.82fr 1.18fr;gap:72px;align-items:start}
.bio__figure{position:relative}
.bio__photo{
  width:100%;aspect-ratio:3/4;object-fit:cover;object-position:center 22%;
  border:1px solid var(--line);
}
.bio__frame{
  position:absolute;inset:14px -14px -14px 14px;border:1px solid var(--gold);
  z-index:-1;
}
.bio__caption{
  margin-top:20px;font-family:"Jost",sans-serif;font-size:11.5px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--ink-faint);text-align:center;
}
.prose p{margin-bottom:1.25em;color:var(--ink-soft)}
.prose p:first-of-type{color:var(--ink)}
.prose .dropcap::first-letter{
  font-family:"Cormorant Garamond",serif;float:left;font-size:78px;line-height:.74;
  padding:8px 14px 0 0;color:var(--plum);font-weight:500;
}
.prose strong{font-weight:500;color:var(--ink)}

/* honors */
.honors{margin-top:38px;border-top:1px solid var(--line);padding-top:30px}
.honors__label{
  font-family:"Jost",sans-serif;font-size:11.5px;letter-spacing:.26em;
  text-transform:uppercase;color:var(--gold);margin-bottom:18px;
}
.honors ul{list-style:none;display:grid;gap:11px}
.honors li{
  display:flex;gap:14px;align-items:baseline;color:var(--ink-soft);font-size:17.5px;
}
.honors li::before{content:"";flex:0 0 auto;width:6px;height:6px;margin-top:8px;
  background:var(--gold);transform:rotate(45deg)}

.btn{
  display:inline-flex;align-items:center;gap:12px;margin-top:40px;
  font-family:"Jost",sans-serif;font-size:12.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--ink);
  padding:15px 30px;border:1px solid var(--ink);
  transition:.4s var(--ease);background:transparent;
}
.btn:hover{background:var(--plum-solid);border-color:var(--plum-solid);color:#F7F3EB}
.btn__arrow{transition:transform .4s var(--ease)}
.btn:hover .btn__arrow{transform:translateX(5px)}

/* =======================  FIELDS  ======================= */
.fields{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line)}
.field{
  padding:54px 40px;border-right:1px solid var(--line);
  transition:background .5s var(--ease);position:relative;
}
.field:last-child{border-right:none}
.field:hover{background:var(--paper)}
.field__num{
  font-family:"Cormorant Garamond",serif;font-size:22px;color:var(--gold);
  font-style:italic;margin-bottom:22px;
}
.field__title{
  font-family:"Cormorant Garamond",serif;font-size:29px;font-weight:500;
  line-height:1.18;margin-bottom:16px;color:var(--ink);
}
.field__desc{font-size:16.5px;color:var(--ink-soft);line-height:1.7}

/* =======================  FEATURE STRIP (image + text)  ======================= */
.feature{display:grid;grid-template-columns:1fr 1fr;align-items:stretch;min-height:520px}
.feature--flip .feature__media{order:2}
.feature__media{position:relative;overflow:hidden;background:#1f1118}
.feature__media img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.feature:hover .feature__media img{transform:scale(1.04)}
.feature__body{
  display:flex;flex-direction:column;justify-content:center;
  padding:84px clamp(40px,6vw,96px);background:var(--paper-2);
}
.feature--dark .feature__body{background:var(--plum-solid);color:#EDE0CF}
.feature--dark .section__title,.feature--dark .field__title{color:#FBF3E6}
.feature--dark .eyebrow{color:var(--gold-bright)}
.feature__body .eyebrow{margin-bottom:18px}
.feature__body h3{
  font-family:"Cormorant Garamond",serif;font-weight:400;
  font-size:clamp(30px,3.4vw,44px);line-height:1.1;margin-bottom:22px;
}
.feature__body p{font-size:17.5px;line-height:1.75;color:inherit;opacity:.92;max-width:46ch}
.feature--dark .feature__body p{color:#E3D4C0}
.link-more{
  margin-top:34px;font-family:"Jost",sans-serif;font-size:12.5px;letter-spacing:.2em;
  text-transform:uppercase;display:inline-flex;gap:12px;align-items:center;
  border-bottom:1px solid currentColor;padding-bottom:6px;width:fit-content;
  transition:gap .4s var(--ease);color:var(--plum);
}
.feature--dark .link-more{color:var(--gold-bright)}
.link-more:hover{gap:20px}

/* =======================  PUBLICATIONS LIST  ======================= */
.pubs{max-width:880px;margin:0 auto}
.pub{
  display:grid;grid-template-columns:auto 1fr;gap:34px;
  padding:34px 0;border-bottom:1px solid var(--line);align-items:baseline;
}
.pub:first-child{border-top:1px solid var(--line)}
.pub__year{
  font-family:"Cormorant Garamond",serif;font-style:italic;font-size:25px;
  color:var(--gold);white-space:nowrap;
}
.pub__title{font-size:20px;line-height:1.5;color:var(--ink);margin-bottom:7px}
.pub__title em{font-style:italic}
.pub__meta{
  font-family:"Jost",sans-serif;font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-faint);
}
.pub__venue{color:var(--plum);font-style:italic;font-family:"Cormorant Garamond",serif;
  font-size:17px;text-transform:none;letter-spacing:0}
.tag{
  display:inline-block;font-family:"Jost",sans-serif;font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold);border:1px solid var(--line);
  padding:3px 11px;margin-left:10px;vertical-align:middle;
}

/* =======================  PROJECT (research) entries  ======================= */
.proj{
  display:grid;grid-template-columns:200px 1fr;gap:48px;
  padding:46px 0;border-bottom:1px solid var(--line);
}
.proj:first-of-type{border-top:1px solid var(--line)}
.proj__side .eyebrow{display:block;margin-bottom:10px}
.proj__period{font-family:"Cormorant Garamond",serif;font-style:italic;font-size:21px;color:var(--plum)}
.proj__role{
  margin-top:10px;font-family:"Jost",sans-serif;font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--ink-faint);
}
.proj__title{
  font-family:"Cormorant Garamond",serif;font-size:27px;font-weight:500;line-height:1.2;
  color:var(--ink);margin-bottom:8px;
}
.proj__host{font-style:italic;color:var(--gold);margin-bottom:16px;font-size:17px}
.proj__desc{color:var(--ink-soft);font-size:17.5px}

/* =======================  PAGE HEADER (interior pages)  ======================= */
.pagehead{position:relative;padding:120px 0 92px;text-align:center;overflow:hidden;background:var(--paper-2)}
.pagehead .eyebrow{display:block;margin-bottom:18px}
.pagehead__title{font-weight:400;font-size:clamp(48px,7vw,92px);line-height:1;color:var(--ink)}
.pagehead__title em{font-style:italic;color:var(--plum)}
.pagehead__sub{margin-top:24px;font-family:"Cormorant Garamond",serif;font-style:italic;
  font-size:23px;color:var(--ink-soft);max-width:40ch;margin-left:auto;margin-right:auto}

/* =======================  FOOTER (colophon)  ======================= */
.foot{position:relative;background:#16100E;color:#A88F71;text-align:center}
.foot::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:var(--gold)}
.foot__inner{max-width:var(--maxw);margin:0 auto;padding:90px 40px 36px}
.foot__orn{width:48px;height:1px;background:var(--gold);margin:0 auto 32px;position:relative}
.foot__orn::after{content:"";position:absolute;left:50%;top:50%;width:6px;height:6px;background:var(--gold);transform:translate(-50%,-50%) rotate(45deg)}
.foot__name{
  font-family:"Cormorant Garamond",serif;font-weight:500;
  font-size:clamp(30px,3.6vw,42px);color:#F4E9D7;letter-spacing:.02em;margin-bottom:16px;
}
.foot__desc{font-size:15px;line-height:1.75;color:#988063;max-width:52ch;margin:0 auto 40px}
.foot__nav{display:inline-flex;flex-wrap:wrap;justify-content:center;margin-bottom:58px}
.foot__nav a{
  font-family:"Jost",sans-serif;font-size:12px;font-weight:300;letter-spacing:.22em;
  text-transform:uppercase;color:#C2A877;padding:4px 22px;position:relative;
  transition:color .35s var(--ease);
}
.foot__nav a + a::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:1px;height:11px;background:rgba(231,216,197,.22);
}
.foot__nav a:hover{color:#F7EEDD}
.foot__bottom{
  padding-top:28px;border-top:1px solid rgba(231,216,197,.13);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;
  font-family:"Jost",sans-serif;font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:#7E654C;
}

/* =======================  EDUCATION TIMELINE  ======================= */
.edu{border-top:1px solid var(--line)}
.edu__row{
  display:grid;grid-template-columns:200px 1fr auto;gap:34px;align-items:baseline;
  padding:26px 0;border-bottom:1px solid var(--line);
}
.edu__year{font-family:"Cormorant Garamond",serif;font-style:italic;font-size:20px;color:var(--gold);white-space:nowrap}
.edu__school{font-family:"Cormorant Garamond",serif;font-size:25px;font-weight:500;color:var(--ink);line-height:1.2}
.edu__deg{display:block;font-size:16px;color:var(--ink-soft);font-style:italic;margin-top:3px}
.edu__rank{
  font-family:"Jost",sans-serif;font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-faint);white-space:nowrap;
}

/* big Chinese name in hero / wordmark CJK */
.hero__name .zh{font-family:"Noto Serif SC",serif;letter-spacing:.14em;font-weight:500}
.brand__name .zh{font-family:"Noto Serif SC",serif;letter-spacing:.18em}
.foot__name .zh,.pagehead__title .zh,.section__title .zh,.feature__body h3 .zh,.field__title .zh,.proj__title .zh{font-family:"Noto Serif SC","Cormorant Garamond",serif}

/* =======================  REVEAL  ======================= */
[data-reveal]{opacity:0;transform:translateY(26px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
[data-reveal].in{opacity:1;transform:none}

/* =======================  RESPONSIVE  ======================= */
@media(max-width:900px){
  body{font-size:18px}
  .wrap{padding:0 24px}
  .nav__inner{padding:16px 24px}
  .menu{gap:18px}
  .menu a{font-size:11.5px;letter-spacing:.1em}
  .navright{gap:16px}
  .nav__inner{flex-wrap:wrap;gap:10px}
  .edu__row{grid-template-columns:1fr;gap:4px;padding:20px 0}
  .edu__rank{margin-top:2px}
  .bio{grid-template-columns:1fr;gap:44px}
  .bio__figure{max-width:380px;margin:0 auto}
  .fields{grid-template-columns:1fr}
  .field{border-right:none;border-bottom:1px solid var(--line)}
  .field:last-child{border-bottom:none}
  .feature{grid-template-columns:1fr}
  .feature--flip .feature__media{order:0}
  .feature__media{min-height:320px}
  .section{padding:78px 0}
  .proj{grid-template-columns:1fr;gap:18px;padding:34px 0}
  .pub{grid-template-columns:1fr;gap:8px}
  .foot__inner{padding:64px 24px 30px}
  .foot__bottom{justify-content:center;text-align:center;flex-direction:column;gap:8px}
}
@media(max-width:560px){
  .brand__name{font-size:12px;letter-spacing:.22em}
  .menu{gap:16px}
  .hero{min-height:78vh}
}