/* Qixuan Huang — site styles. Georgia Tech palette (2026 refresh).
   Shared rules first, then the homepage (and Experiments list), then the
   experiment pages under body.exp-page. Gold is for accents, never small text. */

:root{
  --navy:#051E39; --navy-2:#0d2a4a; --gold:#B39051; --gold-dark:#8F713D; --gold-light:#DEBD88; --diploma:#F9F6E5;
  --ink:#051E39; --body:#2b3645; --muted:#5f6b7a; --line:#ebe6da; --bg:#ffffff; --soft:#fbfaf6;
  --serif:"Crimson Pro",Georgia,serif; --sans:Inter,system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --w:1040px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--body);font:15px/1.65 var(--sans);-webkit-font-smoothing:antialiased}
a{color:var(--navy);text-decoration:none;border-bottom:1.5px solid color-mix(in srgb,var(--gold) 70%,transparent);transition:border-color .15s,background .15s}
a:hover{border-bottom-color:var(--gold-dark);background:color-mix(in srgb,var(--diploma) 80%,transparent)}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
.wrap{max-width:var(--w);margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--serif);color:var(--ink);font-weight:600;letter-spacing:-.005em}
.muted{color:var(--muted)}

/* ---------- nav (all pages) ---------- */
nav{position:fixed;inset:0 0 auto 0;z-index:20;transition:background .25s,box-shadow .25s,color .25s;color:#fff}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
nav a, nav a:hover{background:none}
nav .brand{font-family:var(--serif);font-weight:600;font-size:20px;color:inherit;border:0}
nav .links{display:flex;gap:22px;font-size:14px;font-weight:500}
nav .links a{color:inherit;border:0;opacity:.88;padding:4px 0}
nav .links a:hover, nav .links a.on{opacity:1;box-shadow:inset 0 -2px 0 var(--gold)}
nav.solid{background:rgba(255,255,255,.92);backdrop-filter:blur(10px);color:var(--navy);box-shadow:0 1px 0 var(--line)}
.menu{display:none;background:none;border:0;color:inherit;font-size:22px;cursor:pointer}

/* ---------- footer (all pages), after Wenhao's: dark band, name over email ---------- */
footer{background:var(--navy);color:#c9d2de;padding:40px 0 44px;font-size:14px;border-top:3px solid var(--gold)}
footer .wrap{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap}
footer .name{font-family:var(--serif);font-size:22px;font-weight:600;color:#fff;margin-bottom:6px}
footer .name small{font:400 12px var(--sans);color:#8d9bb0;margin-left:8px;vertical-align:middle}
footer .mail{color:#e6ebf2;letter-spacing:.01em}

/* ---------- hero ---------- */
.hero{position:relative;min-height:min(88vh,820px);display:flex;align-items:flex-end;color:#fff;
      background:url(/images/hero.jpg) center 45%/cover}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,30,57,.5) 0%,rgba(5,30,57,.08) 38%,rgba(5,30,57,.78) 100%)}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:5px;background:linear-gradient(90deg,var(--gold-dark),var(--gold),var(--gold-light))}
.hero .wrap{position:relative;width:100%;padding-bottom:72px}
.hero .eyebrow{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--gold-light);font-weight:600}
.hero h1{color:#fff;font-size:clamp(44px,7vw,84px);line-height:1;margin:10px 0 6px;font-weight:600}
.hero h1 .zh{font-size:.42em;font-weight:500;opacity:.85;margin-left:.3em;font-family:var(--sans);letter-spacing:.05em}
.hero .tag{font-family:var(--serif);font-size:clamp(20px,2.4vw,27px);font-style:italic;opacity:.95;margin:0;white-space:nowrap}
@media (max-width:700px){.hero .tag{white-space:normal;font-size:19px}}
.hero .cta{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;border:0}
.btn.gold{background:var(--gold);color:var(--navy)} .btn.gold:hover{background:var(--gold-light)}
.btn.ghost{color:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.7)} .btn.ghost:hover{background:rgba(255,255,255,.12)}
.scroll{position:absolute;right:24px;bottom:28px;font-size:12px;letter-spacing:.12em;opacity:.75;text-transform:uppercase}

/* ---------- sections ---------- */
section{padding:72px 0;border-bottom:1px solid var(--line)}
section.alt{background:var(--soft)}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:28px}
.sec-head h1,.sec-head h2{font-size:34px;margin:0;display:flex;align-items:center;gap:12px}
.sec-head h1::before,.sec-head h2::before{content:"";width:22px;height:3px;background:var(--gold);border-radius:2px}
.list-page{padding-top:60px;min-height:calc(100vh - 140px)}
.sec-head .more{font-size:14px;font-weight:500}
.chip{display:inline-block;background:var(--diploma);color:var(--gold-dark);border:1px solid #efe6cc;border-radius:999px;padding:3px 12px;font-size:13px;font-weight:500;margin:0 6px 8px 0}

/* about */
.about{display:grid;grid-template-columns:260px 1fr;gap:48px;align-items:start}
.portrait{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:50% 72%;border-radius:14px;display:block}
.icons{display:flex;align-items:center;justify-content:center;gap:22px;margin-top:16px}
.icons a{border:0;color:var(--muted);display:inline-flex;align-items:center;font:600 12.5px var(--sans);letter-spacing:.04em;transition:color .15s}
.icons a:hover{color:var(--navy);background:none}
.icons svg{width:19px;height:19px;fill:currentColor}
.aff{margin-top:20px;display:grid;gap:10px;font-size:13.5px}
.aff div{display:flex;gap:10px;align-items:center}
.aff .dot{width:30px;height:30px;border-radius:8px;flex:none;display:grid;place-items:center;font-weight:700;font-size:11px;color:#fff}
.aff b{display:block;color:var(--ink);font-weight:600}
.about p{margin:0 0 14px;font-size:16px}
.now{margin:22px 0 18px;background:var(--diploma);border-left:4px solid var(--gold);border-radius:0 12px 12px 0;padding:14px 18px}
.now .lbl{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-dark);font-weight:700}
.now p{margin:4px 0 0;font-size:15.5px;color:var(--ink)}

/* news */
.news{display:grid;grid-template-columns:110px 1fr;row-gap:12px;column-gap:20px;font-size:15px}
.news .d{color:var(--gold-dark);font-weight:600;font-variant-numeric:tabular-nums;font-size:14px}

/* featured / research */
.feature{display:grid;grid-template-columns:1.15fr 1fr;gap:0;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:#fff}
.feature .media{min-height:300px;background:linear-gradient(135deg,var(--navy) 0%,#183b63 100%);position:relative;display:grid;place-items:center;color:var(--gold-light)}
.feature .media span{font-size:13px;letter-spacing:.12em;text-transform:uppercase;opacity:.85}
.feature .media .play{width:64px;height:64px;border-radius:50%;border:2px solid var(--gold-light);display:grid;place-items:center;margin:0 auto 12px;font-size:22px}
.feature .txt{padding:28px 30px}
.badge{display:inline-block;border-radius:999px;padding:2px 10px;font-size:12px;font-weight:600}
.badge.thesis{background:var(--navy);color:var(--gold-light)}
.badge.conf{background:var(--navy);color:#fff}
.badge.review{background:#e6f3f1;color:#03665f}
.badge.soft{background:var(--diploma);color:var(--gold-dark)}
.feature h3{font-size:28px;margin:10px 0 8px;line-height:1.15}
.feature ul{margin:0;padding-left:18px;font-size:14.5px}
.feature li{margin-bottom:4px}
.linkrow{display:flex;gap:14px;flex-wrap:wrap;margin-top:14px;font-size:14px;font-weight:500}
.soon{font-size:13px;color:var(--muted);font-style:italic}

.pubs{display:grid;gap:18px;margin-top:40px}
.pub{display:grid;grid-template-columns:200px 1fr auto;gap:22px;align-items:start;padding:18px;border:1px solid var(--line);border-radius:14px;background:#fff;transition:box-shadow .2s,border-color .2s}
.pub:hover{border-color:#e1d3ac;box-shadow:0 8px 24px -16px rgba(5,30,57,.35)}
.pub .thumb{aspect-ratio:16/10;border-radius:10px;background:linear-gradient(135deg,#eef1f5,#dfe5ec);display:grid;place-items:center;color:#8a97a8;font-size:12px}
.pub img.thumb{width:100%;height:auto;object-fit:cover;display:block;border:1px solid var(--line)}
.pub h3{font-size:21px;margin:4px 0 4px;line-height:1.2}
.pub .authors{font-size:14px;color:var(--muted)}
.pub .authors b{color:var(--ink);font-weight:600;box-shadow:inset 0 -2px 0 var(--gold-light)}
.pub .where{margin-top:2px;color:var(--ink);font-style:italic;font-family:var(--serif);font-size:16px}
.cite{border:1px solid var(--line);background:#fff;border-radius:8px;padding:5px 12px;font:600 12.5px var(--sans);color:var(--navy);cursor:pointer}
.cite:hover{border-color:var(--gold)}
pre.bib{display:none;grid-column:1/-1;margin:0;background:var(--navy);color:#e9eef5;border-radius:10px;padding:14px 16px;font-size:12.5px;overflow:auto}
.pub.open pre.bib{display:block}

/* experience timeline */
.twocol{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.twocol h3.sub{font-size:22px;margin:0 0 18px}
.tl{position:relative;margin:0;padding:0;list-style:none}
.tl::before{content:"";position:absolute;left:21px;top:6px;bottom:6px;width:2px;background:var(--line)}
.tl li{position:relative;display:grid;grid-template-columns:44px 1fr;gap:16px;padding-bottom:24px}
.tl .logo{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:700;font-size:12px;position:relative;z-index:1;box-shadow:0 0 0 4px var(--soft)}
.tl .when{font-size:12.5px;color:var(--gold-dark);font-weight:600;letter-spacing:.04em}
.tl .what{font-weight:600;color:var(--ink)}
.tl .role{font-size:13.5px;color:var(--ink);opacity:.8}
.tl .detail{font-size:14px;color:var(--muted)}

/* experiment cards (homepage and experiments.html) */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.exp{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;display:flex;flex-direction:column}
.exp .viz{height:150px;background:var(--navy);position:relative;overflow:hidden}
.exp .body{padding:16px 18px 18px}
.exp h3{font-size:20px;margin:6px 0 4px}
a.exp{color:inherit;border:1px solid var(--line);transition:box-shadow .2s,border-color .2s,transform .2s}
a.exp:hover{background:#fff;border-color:#e1d3ac;box-shadow:0 10px 26px -18px rgba(5,30,57,.45);transform:translateY(-2px)}
.exp .when{font-size:12.5px;color:var(--gold-dark);font-weight:600}
.exp.tpl{background:#f4f5f7} .exp.tpl:hover{background:#f4f5f7}
.exp.tpl .viz{filter:grayscale(1);opacity:.55}
.exp.tpl .when{color:var(--muted)} .exp.tpl h3{color:#5f6b7a}
.credit{margin:18px 0 0;font-size:13px;color:var(--muted)} .credit a{color:var(--muted)}
canvas{display:block;width:100%;height:100%}

/* cv */
.cv{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.cv h4{font:700 12px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--gold-dark);margin:0 0 10px}
.cv ul{margin:0;padding-left:18px;font-size:14.5px}
.cv li{margin-bottom:8px}
.cv li .muted{font-size:13px;display:block}
.cv-cta{display:flex;align-items:center;gap:16px;margin-top:30px;padding:18px 22px;border-radius:14px;background:var(--navy);color:#dfe6ef}
.cv-cta b{color:#fff;font-family:var(--serif);font-size:20px;font-weight:600}

/* life */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.gallery figure{margin:0;position:relative;border-radius:12px;overflow:hidden;aspect-ratio:1}
.gallery img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s}
.gallery figure:hover img{transform:scale(1.04)}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:22px 12px 9px;font-size:12.5px;color:#fff;background:linear-gradient(transparent,rgba(5,30,57,.8))}
.misc{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:26px}
.misc div{border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:14px;background:#fff}
.misc .k{font:700 11.5px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--gold-dark);display:block;margin-bottom:4px}

@media (max-width:860px){
  nav .links{display:none;position:absolute;top:60px;left:0;right:0;flex-direction:column;gap:0;background:#fff;color:var(--navy);padding:8px 24px 16px;box-shadow:0 10px 20px -10px rgba(0,0,0,.2)}
  nav .links.open{display:flex} nav .links a{padding:10px 0}
  .menu{display:block}
  .about,.feature,.twocol,.cv{grid-template-columns:1fr}
  .about{gap:28px} .portrait{max-width:240px} .icons{justify-content:flex-start;max-width:240px}
  .pub{grid-template-columns:1fr}
  .grid3,.misc{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr 1fr}
  .news{grid-template-columns:1fr;row-gap:2px} .news .t{margin-bottom:12px}
}
@media (max-width:520px){ .wrap{padding:0 16px} section{padding:56px 0} .sec-head h2{font-size:28px}}

/* ======================================================================
   Experiment pages (exps/*.html): body.exp-page
   ====================================================================== */
body.exp-page{font-size:16px;line-height:1.7}
body.exp-page code{font:13px var(--mono);background:#f3f1ea;border-radius:4px;padding:1px 5px}
body.exp-page footer{margin-top:40px}

.exp-page .layout{max-width:1040px;margin:0 auto;padding:88px 24px 80px;display:grid;grid-template-columns:200px minmax(0,720px);gap:48px;justify-content:center}
.exp-page aside{position:sticky;top:84px;align-self:start;font-size:13.5px}
.exp-page aside .lbl{font:700 11px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--gold-dark);margin-bottom:8px}
.exp-page aside a{display:block;border:0;color:var(--muted);padding:3px 0}
.exp-page aside a.q{padding-left:12px;font-size:12.5px}
.exp-page aside a:hover{color:var(--navy);background:none}

.exp-page .crumb{font-size:13px;color:var(--muted)} .exp-page .crumb a{border:0;color:var(--muted)} .exp-page .crumb a:hover{color:var(--navy)}
.exp-page .date{margin-top:22px;font-size:14px;color:var(--gold-dark);font-weight:600}
.exp-page h1{font-size:clamp(34px,5vw,46px);line-height:1.1;margin:8px 0 14px}
.exp-page .standfirst{font-size:18px;line-height:1.6;color:var(--ink)}
.exp-page .by{display:flex;align-items:center;gap:10px;margin:18px 0 0;font-size:14px;color:var(--muted)}
.exp-page .by img{width:30px;height:30px;border-radius:50%;object-fit:cover;object-position:50% 70%}

.exp-page .cover{margin:30px 0 10px;aspect-ratio:16/10;border-radius:14px;background:var(--navy);overflow:hidden}
.exp-page h2{font-size:32px;margin:56px 0 12px}
.exp-page h3{font-size:22px;margin:34px 0 8px;line-height:1.25}
.exp-page .st{display:inline-block;font:600 11.5px var(--sans);letter-spacing:.04em;border-radius:999px;padding:2px 10px;margin-right:8px;vertical-align:4px}
.exp-page .st.answered{background:#e6f3f1;color:#03665f}
.exp-page .st.running{background:#fff4dc;color:#8a5a00}
.exp-page .st.queued{background:#f3eefb;color:#5b3b8c}
.exp-page .st.planned{background:#eef1f5;color:#5f6b7a}
.exp-page .tagm{font:600 10.5px var(--sans);border-radius:4px;padding:1px 6px;margin-left:6px;vertical-align:1px}
.exp-page .tagm.main{background:var(--gold);color:var(--navy)} .exp-page .tagm.base{background:#dfe4ea;color:#3e4a59}

.exp-page .panels{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0}
.exp-page .panel{border:1px solid var(--line);border-radius:10px;overflow:hidden;font-size:13.5px}
.exp-page .panel .pic{height:120px;background:var(--navy);display:grid;place-items:center;color:var(--gold-light);font-size:12px;letter-spacing:.1em}
.exp-page .panel .t{padding:8px 12px}

.exp-page .fig{margin:18px 0 6px;border:1px solid var(--line);border-radius:12px;padding:14px 16px 10px;background:#fff}
.exp-page .fig .ttl{font-weight:600;color:var(--ink);font-size:14.5px;display:flex;justify-content:space-between;gap:10px;align-items:center}
.exp-page .fig .plot{position:relative;height:220px;margin-top:10px;border-left:1.5px solid #c9ced6;border-bottom:1.5px solid #c9ced6;
           background:repeating-linear-gradient(0deg,transparent 0 43px,#f1f3f5 43px 44px)}
.exp-page .fig .status{position:absolute;inset:0;display:grid;place-items:center;font:600 13px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:#9aa4b1}
.exp-page .fig .ax{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:6px}
.exp-page .fig .legend{display:flex;gap:14px;font-size:12.5px;color:var(--muted);margin-top:4px;flex-wrap:wrap}
.exp-page .fig .legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.exp-page .vids{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}
.exp-page .vid{aspect-ratio:16/10;border-radius:8px;background:#0d2a4a;display:grid;place-items:center;color:var(--gold-light);font-size:12px;letter-spacing:.08em}
.exp-page .cap{font-size:13.5px;color:var(--muted);margin:6px 0 0}

.exp-page .diff{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:14px 0;font:12.5px/1.7 var(--mono)}
.exp-page .diff .hd{background:#f6f4ee;padding:6px 12px;font:600 12px var(--sans);color:var(--muted);border-bottom:1px solid var(--line);display:flex;justify-content:space-between}
.exp-page .diff div.l{padding:0 12px;white-space:pre-wrap}
.exp-page .diff .del{background:#fdecec;color:#8a1f1f} .exp-page .diff .add{background:#e8f5ee;color:#16603a} .exp-page .diff .cm{color:#8a97a8}

.exp-page .tbl{overflow-x:auto}
.exp-page table{width:100%;border-collapse:collapse;font-size:13px;margin-top:10px}
.exp-page th,.exp-page td{text-align:left;padding:7px 8px;border-bottom:1px solid var(--line);vertical-align:top}
.exp-page th{font:600 11px var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--gold-dark)}
.exp-page td{font-size:12.5px}
.exp-page td.setup{min-width:150px}
.exp-page tr.sum td{border:0;padding-top:10px;font-weight:600;color:var(--ink)}
.exp-page tr.sum + tr.sum td{padding-top:2px}
.exp-page pre{background:var(--navy);color:#e9eef5;border-radius:10px;padding:14px 16px;font:12.5px/1.6 var(--mono);overflow:auto}

.exp-page .spec{margin:14px 0;border:1.5px dashed var(--gold);background:var(--diploma);border-radius:10px;padding:12px 16px;font-size:14px;line-height:1.6;color:#4b3d1f}
.exp-page .spec > b:first-child{display:block;font:700 11.5px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--gold-dark);margin-bottom:4px}
.exp-page .spec ul{margin:4px 0 0;padding-left:18px} .exp-page .spec li{margin-bottom:5px}
.exp-page .spec code{background:#efe6cc}
.exp-page .sw{display:inline-block;width:11px;height:11px;border-radius:2px;vertical-align:-1px;border:1px solid rgba(0,0,0,.15)}
.exp-page .ph{color:var(--muted);font-style:italic}
.exp-page .ack-fixed{border-left:3px solid var(--gold);padding-left:14px}
.exp-page .credit{margin-top:48px;padding-top:14px;border-top:1px solid var(--line)}

@media (max-width:900px){ .exp-page .layout{grid-template-columns:minmax(0,1fr)} .exp-page aside{display:none} }
@media (max-width:520px){ .exp-page .layout{padding:76px 16px 60px} .exp-page .panels,.exp-page .vids{grid-template-columns:1fr} }