/* =========================================================
   Jenny (Xin Yu) Ye — portfolio + research + practice
   Shared design system.  Minimal editorial.
   Add pages freely; reuse the components below.
   ========================================================= */

:root{
  --ink:#1a1a1a;
  --ink-2:#2b2b29;
  --muted:#8a8a86;
  --faint:#b7b5ae;
  --line:#e6e4df;
  --line-2:#d8d5cd;
  --bg:#faf9f6;
  --bg-2:#f2f0ea;      /* subtle section band */
  --panel:#ffffff;
  --accent:#9d5c3d;    /* clay — used sparingly */
  --accent-soft:#f0e7e0;
  --maxw:1240px;
  --pad:40px;
  --sans:"Helvetica Neue",Helvetica,Arial,sans-serif;
  --serif:Georgia,"Times New Roman",serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-weight:300;line-height:1.55;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none;transition:color .2s,opacity .2s}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}

/* ---------- Typography helpers ---------- */
h1,h2,h3,h4{font-weight:300;letter-spacing:-.01em;line-height:1.1}
.eyebrow{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.section-label{
  display:flex;align-items:center;gap:18px;
  font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);
  margin:0 auto 26px;
}
.section-label::after{content:"";flex:1;height:1px;background:var(--line)}
.lede{font-size:clamp(17px,2vw,20px);color:var(--ink-2);line-height:1.7}
.muted{color:var(--muted)}

/* ---------- Header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(250,249,246,.86);
  backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--line);
}
.nav{
  max-width:var(--maxw);margin:0 auto;padding:16px var(--pad);
  display:flex;justify-content:space-between;align-items:center;
}
.brand{display:flex;flex-direction:column;line-height:1.15}
.brand .name{font-size:15px;letter-spacing:.06em;font-weight:400}
.brand .role{font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);position:relative;padding:4px 0}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--ink)}
.nav-links a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:1.5px;background:var(--accent);
}
.nav-cta{
  border:1px solid var(--ink);color:var(--ink)!important;border-radius:22px;
  padding:8px 18px!important;font-size:11.5px!important;
}
.nav-cta:hover{background:var(--ink);color:#fff!important}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:6px;flex-direction:column;gap:5px}
.nav-toggle span{width:24px;height:1.5px;background:var(--ink);transition:.25s}
.nav-toggle.open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;font-size:12.5px;letter-spacing:.12em;
  text-transform:uppercase;border:1px solid var(--ink);color:var(--ink);
  padding:12px 22px;border-radius:26px;background:transparent;cursor:pointer;
}
.btn:hover{background:var(--ink);color:#fff}
.btn.solid{background:var(--ink);color:#fff}
.btn.solid:hover{background:var(--accent);border-color:var(--accent)}
.btn.ghost{border-color:var(--line-2);color:var(--ink-2)}
.btn.ghost:hover{border-color:var(--ink);background:transparent;color:var(--ink)}
.textlink{color:var(--accent);border-bottom:1px solid transparent;padding-bottom:1px}
.textlink:hover{border-color:var(--accent)}
.arrowlink{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink)}
.arrowlink:hover{color:var(--accent)}

/* ---------- Pills / tags ---------- */
.tags{display:flex;flex-wrap:wrap;gap:8px}
.pill{
  font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
  border:1px solid var(--line);padding:5px 12px;border-radius:20px;background:var(--panel);
}
.pill.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.pill.accent{color:var(--accent);border-color:var(--accent-soft);background:var(--accent-soft)}

/* ---------- Generic section ---------- */
section{padding:72px 0}
.band{background:var(--bg-2)}
.tight{padding-top:34px}

/* ---------- Home hero ---------- */
.hero{padding:76px 0 60px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(34px,5.2vw,62px);letter-spacing:-.015em;line-height:1.04}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero .lede{margin-top:26px;max-width:48ch}
.hero .hero-actions{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.hero-figure{position:relative}
.hero-figure img{width:100%;aspect-ratio:4/5;object-fit:cover;background:var(--bg-2)}
.hero-figure figcaption{margin-top:12px;font-size:12px;color:var(--muted);letter-spacing:.03em}
.hero-meta{margin-top:40px;border-top:1px solid var(--line);padding-top:24px;
  display:flex;gap:40px;flex-wrap:wrap;font-size:12.5px;letter-spacing:.06em;color:var(--muted);text-transform:uppercase}

/* ---------- Expertise strip ---------- */
.expertise{display:flex;flex-wrap:wrap;gap:10px 10px}

/* ---------- Project gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(12,1fr);gap:34px 30px}
.tile{grid-column:span 6;display:block}
.tile.wide{grid-column:span 12}
.tile.third{grid-column:span 4}
.tile .frame{overflow:hidden;background:#efeee9;aspect-ratio:4/3;position:relative}
.tile .frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.97);
  transition:transform .9s cubic-bezier(.2,.7,.2,1)}
.tile:hover .frame img{transform:scale(1.045)}
.tile .frame .hoverlabel{
  position:absolute;left:16px;bottom:14px;color:#fff;font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;opacity:0;transform:translateY(6px);transition:.4s;text-shadow:0 1px 10px rgba(0,0,0,.55)}
.tile:hover .frame .hoverlabel{opacity:1;transform:none}
.cap{display:flex;justify-content:space-between;align-items:baseline;margin-top:14px;gap:16px}
.cap .t{font-size:16px;font-weight:400}
.cap .t small{display:block;font-weight:300;color:var(--muted);font-size:13px;margin-top:3px}
.cap .n{font-size:12px;color:var(--faint);letter-spacing:.1em}
.cap .cat{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}

/* ---------- Article / research cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.card{background:var(--panel);border:1px solid var(--line);display:flex;flex-direction:column;height:100%}
.card .frame{aspect-ratio:16/10;overflow:hidden;background:#efeee9}
.card .frame img{width:100%;height:100%;object-fit:cover;transition:transform .8s}
.card:hover .frame img{transform:scale(1.04)}
.card .body{padding:22px 22px 24px;display:flex;flex-direction:column;gap:12px;flex:1}
.card .kicker{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.card h3{font-size:19px;font-weight:400;line-height:1.25}
.card p{font-size:14px;color:var(--ink-2);line-height:1.65}
.card .meta{margin-top:auto;font-size:11.5px;color:var(--muted);letter-spacing:.04em;display:flex;gap:14px}

/* list-style articles (insights) */
.post-list{border-top:1px solid var(--line)}
.post-row{display:grid;grid-template-columns:130px 1fr auto;gap:28px;align-items:baseline;
  padding:26px 0;border-bottom:1px solid var(--line)}
.post-row .date{font-size:12px;color:var(--muted);letter-spacing:.04em}
.post-row h3{font-size:22px;font-weight:400}
.post-row p{font-size:14.5px;color:var(--ink-2);margin-top:8px;max-width:64ch}
.post-row .topic{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);white-space:nowrap}
.post-row:hover h3{color:var(--accent)}

/* ---------- Project / article detail ---------- */
.detail-lead{padding:46px 0 30px}
.detail-lead h1{font-size:clamp(32px,6vw,60px)}
.detail-lead .sub{margin-top:16px;font-size:18px;color:var(--ink-2);max-width:56ch}
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;
  border-top:1px solid var(--line);padding-top:26px;margin-top:30px}
.facts dt{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.facts dd{font-size:15px}
.hero-full img{width:100%;max-height:78vh;object-fit:cover}
.prose{max-width:760px;margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.prose ul.pills-list{list-style:none;display:flex;flex-wrap:wrap;gap:9px;margin:6px 0 26px;padding:0}
.prose ul.pills-list li{border:0;padding:0}
.prose ul.pills-list li span{display:inline-block;font-size:12.5px;letter-spacing:.06em;color:var(--ink-2);
  border:1px solid var(--line-2);background:var(--panel);padding:8px 14px;border-radius:22px}
.codeframe{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:8px 0 26px}
.codeframe .cf{border:1px solid var(--line);background:var(--panel);padding:18px 18px 20px}
.codeframe .cf .n{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);display:block;margin-bottom:8px}
.codeframe .cf code{display:inline-block;font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace;font-size:13px;
  background:var(--bg-2);border:1px solid var(--line);border-radius:4px;padding:4px 9px;color:var(--ink);margin-bottom:10px}
.codeframe .cf p{font-size:14px;line-height:1.6;color:var(--ink-2);margin:0}
@media(max-width:640px){.codeframe{grid-template-columns:1fr}}
.prose h2{font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:34px 0 14px}
.prose h3{font-size:22px;font-weight:400;margin:28px 0 12px}
.prose p{font-size:17px;line-height:1.78;margin-bottom:22px;color:var(--ink-2)}
.prose p.big{font-size:22px;line-height:1.55;color:var(--ink)}
.prose ul{list-style:none;margin:0 0 26px}
.prose ul li{font-size:16px;padding:12px 0;border-bottom:1px solid var(--line);display:flex;gap:16px}
.prose ul li b{font-weight:400;min-width:150px;color:var(--ink)}
.prose blockquote{border-left:2px solid var(--accent);padding:4px 0 4px 22px;margin:26px 0;
  font-size:20px;line-height:1.5;color:var(--ink)}
.plate{margin:52px auto}
.plate img{width:100%;background:#efeee9}
.plate .cap{font-size:12px;color:var(--muted);margin-top:12px;letter-spacing:.03em}
.plate.bordered img{border:1px solid var(--line)}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:52px auto}
.duo figure{margin:0}
.duo .cap{font-size:12px;color:var(--muted);margin-top:10px}
.disc{font-size:12px;color:var(--muted);font-style:italic;max-width:760px;margin:0 auto}

/* ---------- Next / pager ---------- */
.pager{border-top:1px solid var(--line);margin-top:20px}
.pager .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px;padding-top:40px;padding-bottom:40px}
.pager a.cta{font-size:clamp(20px,3vw,30px);font-weight:300}
.pager a.cta:hover{color:var(--accent)}
.pager .r{font-size:13px;color:var(--muted);text-align:right}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:300px 1fr;gap:56px;align-items:start}
.about-grid .portrait img{width:100%;aspect-ratio:4/5;object-fit:cover;background:var(--bg-2)}
.about-grid .portrait .contact{margin-top:22px;font-size:13px;color:var(--ink-2);line-height:2}
.about-block{margin-bottom:40px}
.about-block h2{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);
  margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.about-block p{font-size:16px;line-height:1.75;color:var(--ink-2);margin-bottom:14px}
.cv-row{display:flex;justify-content:space-between;gap:20px;padding:12px 0;border-bottom:1px solid var(--line)}
.cv-row:last-child{border-bottom:0}
.cv-row .l b{font-weight:400}
.cv-row .l small{display:block;color:var(--muted);font-size:13px;margin-top:3px}
.cv-row .r{font-size:13px;color:var(--muted);white-space:nowrap;letter-spacing:.03em}
.progress{margin:8px 0 4px}
.progress .bar{height:5px;background:var(--line);border-radius:4px;overflow:hidden}
.progress .bar span{display:block;height:100%;background:var(--accent)}
.progress .lab{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:6px}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.field{margin-bottom:18px;display:flex;flex-direction:column;gap:7px}
.field label{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.field input,.field textarea,.field select{
  font-family:var(--sans);font-size:15px;color:var(--ink);background:var(--panel);
  border:1px solid var(--line-2);padding:13px 14px;border-radius:2px;width:100%}
.field textarea{min-height:150px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--ink)}
.contact-list{list-style:none;font-size:15px;line-height:1.4}
.contact-list li{padding:18px 0;border-bottom:1px solid var(--line)}
.contact-list li .k{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:5px}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);margin-top:20px;background:var(--bg-2)}
.site-footer .wrap{padding-top:56px;padding-bottom:56px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
.site-footer .big{font-size:clamp(22px,3vw,30px);font-weight:300;grid-column:1/-1;max-width:22ch;margin-bottom:14px}
.site-footer h4{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.site-footer a{display:block;font-size:14px;color:var(--ink-2);padding:5px 0}
.site-footer a:hover{color:var(--accent)}
.site-footer .legal{grid-column:1/-1;border-top:1px solid var(--line);margin-top:20px;padding-top:22px;
  font-size:12px;color:var(--muted);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ---------- Project gallery + lightbox ---------- */
.pgallery{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin:0 auto}
.pgallery .pg-item{margin:0;cursor:zoom-in;background:#efeee9;position:relative;overflow:hidden}
.pgallery .pg-item.hero{grid-column:1/-1}
.pgallery .pg-item .imgwrap{overflow:hidden;position:relative;display:block}
.pgallery .pg-item.hero .imgwrap{aspect-ratio:16/9}
.pgallery .pg-item:not(.hero) .imgwrap{aspect-ratio:4/3}
.pgallery .pg-item img{width:100%;height:100%;object-fit:cover;display:block;filter:saturate(.98);
  transition:transform .8s cubic-bezier(.2,.7,.2,1)}
.pgallery .pg-item:hover img{transform:scale(1.035)}
.pgallery .pg-item .zoom{position:absolute;right:12px;bottom:12px;width:34px;height:34px;border-radius:50%;
  background:rgba(26,26,26,.72);color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:15px;opacity:0;transform:translateY(6px);transition:.3s;pointer-events:none}
.pgallery .pg-item:hover .zoom{opacity:1;transform:none}
.pgallery figcaption{font-size:12px;color:var(--muted);letter-spacing:.02em;padding:10px 2px 0}
.gallery-note{font-size:12px;color:var(--muted);letter-spacing:.04em;margin:0 auto 18px}

/* full-width portfolio spreads */
.pgallery.spreads{display:block}
.pgallery.spreads .pg-item{width:100%;margin:0 0 26px;background:#fff;border:1px solid var(--line)}
.pgallery.spreads .pg-item .imgwrap{aspect-ratio:auto;display:block}
.pgallery.spreads .pg-item img{width:100%;height:auto;object-fit:contain;filter:none}
.pgallery.spreads .pg-item:hover img{transform:none}
.pgallery.spreads figcaption{padding:11px 15px 14px}

.lightbox{position:fixed;inset:0;z-index:100;background:rgba(20,19,17,.94);
  display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:opacity .25s}
.lightbox.open{opacity:1;visibility:visible}
.lightbox .lb-stage{width:94vw;height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:2.5vh 0}
.lightbox img{max-width:94vw;max-height:calc(100vh - 140px);object-fit:contain;box-shadow:0 12px 60px rgba(0,0,0,.5);background:#faf9f6}
.lightbox .lb-cap{color:#e9e7e1;font-size:13px;letter-spacing:.03em;text-align:center;max-width:70ch}
.lightbox .lb-count{color:#9b988f;font-size:12px;letter-spacing:.14em}
.lb-btn{position:absolute;background:none;border:0;color:#fff;cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:opacity .2s;opacity:.8}
.lb-btn:hover{opacity:1}
.lb-close{top:20px;right:26px;font-size:30px;font-weight:200;line-height:1}
.lb-prev,.lb-next{top:50%;transform:translateY(-50%);width:60px;height:80px;font-size:44px;font-weight:200}
.lb-prev{left:12px}.lb-next{right:12px}
@media(max-width:640px){
  .pgallery{grid-template-columns:1fr;gap:16px}
  .lb-prev,.lb-next{width:44px;font-size:32px}
  .lb-prev{left:2px}.lb-next{right:2px}
  .lightbox .lb-close{top:12px;right:14px}
}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .hero-figure{order:-1}
  .hero-figure img{aspect-ratio:16/11}
  .cards{grid-template-columns:1fr 1fr}
  .about-grid{grid-template-columns:1fr;gap:30px}
  .about-grid .portrait{max-width:320px}
  .contact-grid{grid-template-columns:1fr;gap:36px}
  .facts{grid-template-columns:1fr 1fr}
  .site-footer .wrap{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  :root{--pad:22px}
  .nav-links{
    position:fixed;inset:61px 0 auto 0;background:var(--bg);border-bottom:1px solid var(--line);
    flex-direction:column;align-items:flex-start;gap:0;padding:8px 22px 20px;
    transform:translateY(-120%);transition:transform .3s;box-shadow:0 12px 24px rgba(0,0,0,.05)}
  .nav-links.open{transform:none}
  .nav-links a{padding:14px 0;width:100%;border-bottom:1px solid var(--line);font-size:14px}
  .nav-links a.active::after{display:none}
  .nav-cta{margin-top:10px;text-align:center}
  .nav-toggle{display:flex}
  .gallery .tile,.gallery .tile.third,.gallery .tile.wide{grid-column:span 12}
  .cards{grid-template-columns:1fr}
  .duo{grid-template-columns:1fr}
  .post-row{grid-template-columns:1fr;gap:8px}
  .post-row .topic{order:-1}
  .site-footer .wrap{grid-template-columns:1fr}
  section{padding:52px 0}
}