/* Qinghua Chen — site styles. Warm paper, ink, deep teal; serif for voice, sans for utility. */
@font-face{font-family:"Source Serif 4";src:url("/fonts/source-serif-4-latin-wght-normal.woff2") format("woff2");font-weight:200 900;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url("/fonts/source-serif-4-latin-wght-italic.woff2") format("woff2");font-weight:200 900;font-style:italic;font-display:swap}
@font-face{font-family:"Inter";src:url("/fonts/inter-latin-wght-normal.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap}

:root{
  --paper:#fbf8f3; --paper-2:#f3eee5; --card:#fffdf9;
  --ink:#1f2a33; --ink-2:#3b4852; --muted:#66717a;
  --primary:#1f4e5f; --primary-ink:#173b48; --accent:#b4552d; --accent-soft:#f1e0d5;
  --rule:#e2d9ca; --focus:#b4552d;
  --serif:"Source Serif 4","Songti SC","Noto Serif SC","Source Han Serif SC",STSong,"Times New Roman",serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --wrap:68rem; --read:40rem;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#161b1f;--paper-2:#1d242a;--card:#1b2227;--ink:#e9e4da;--ink-2:#cfc9bd;--muted:#98a2aa;
    --primary:#7fb3c4;--primary-ink:#a6cbd8;--accent:#e08a5f;--accent-soft:#2c2420;--rule:#2d363d;--focus:#e08a5f}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:1rem;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--primary);text-decoration-thickness:1px;text-underline-offset:.18em;text-decoration-color:color-mix(in srgb,var(--primary) 45%,transparent)}
a:hover{color:var(--accent);text-decoration-color:currentColor}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:2px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1.25rem}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;background:var(--card);padding:.5rem 1rem;z-index:10}

/* header */
.site-header{border-bottom:1px solid var(--rule);background:var(--paper)}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:.5rem 2rem;padding-top:1.1rem;padding-bottom:1.1rem}
.brand{font-family:var(--serif);font-size:1.3rem;font-weight:600;color:var(--ink);text-decoration:none;letter-spacing:.005em}
.brand span{font-weight:400;color:var(--muted);margin-left:.5rem;font-size:1.05rem}
.brand:hover{color:var(--primary)}
.nav{display:flex;flex-wrap:wrap;gap:.25rem 1.5rem;list-style:none;margin:0;padding:0;font-size:.92rem}
.nav a{color:var(--ink-2);text-decoration:none;padding:.25rem 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--primary);border-color:var(--rule)}
.nav a[aria-current="page"]{color:var(--primary);border-color:var(--accent);font-weight:500}

/* type */
h1,h2,h3{font-family:var(--serif);color:var(--ink);line-height:1.2;font-weight:600}
h1{font-size:clamp(2rem,4.2vw,2.9rem);margin:0 0 .4em;letter-spacing:-.005em}
h2{font-size:1.6rem;margin:2.4em 0 .6em}
h3{font-size:1.2rem;margin:1.8em 0 .4em}
.eyebrow{font-family:var(--sans);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:600;margin:0 0 .75rem}
.lede{font-family:var(--serif);font-size:1.28rem;line-height:1.6;color:var(--ink-2)}
.muted{color:var(--muted)}

/* hero */
.hero{padding:3.5rem 0 2.5rem}
.hero .wrap{display:grid;grid-template-columns:minmax(0,15rem) 1fr;gap:3rem;align-items:center}
.portrait{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:6px;box-shadow:0 1px 0 var(--rule),0 12px 30px -18px rgba(31,42,51,.45)}
.role{font-size:1rem;color:var(--muted);margin:0 0 1.25rem}
.role strong{color:var(--ink-2);font-weight:500}
.links{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.5rem}
.btn{display:inline-block;padding:.55rem 1.05rem;border-radius:4px;font-size:.92rem;font-weight:500;text-decoration:none;border:1px solid var(--primary);color:var(--primary)}
.btn:hover{background:var(--primary);color:var(--paper)}
.btn.primary{background:var(--primary);color:var(--paper)}
.btn.primary:hover{background:var(--primary-ink);border-color:var(--primary-ink)}

/* sections */
.section{padding:2.75rem 0;border-top:1px solid var(--rule)}
.section.tint{background:var(--paper-2)}
.section h2:first-child{margin-top:0}
.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;margin-bottom:1.5rem}
.section-head h2{margin:0}
.more{font-size:.92rem;white-space:nowrap}
.grid{display:grid;gap:1.5rem 3rem;grid-template-columns:repeat(auto-fit,minmax(20rem,1fr))}
.theme h3{margin:0 0 .35rem;font-size:1.1rem;color:var(--primary-ink)}
.theme p{margin:0;color:var(--ink-2);font-size:.96rem}
.now{list-style:none;margin:0;padding:0;display:grid;gap:.9rem}
.now li{padding-left:1.1rem;position:relative}
.now li::before{content:"";position:absolute;left:0;top:.72em;width:.4rem;height:.4rem;border-radius:50%;background:var(--accent)}

/* pull quote */
.quote{margin:0;padding:0 0 0 1.5rem;border-left:3px solid var(--accent)}
.quote p{font-family:var(--serif);font-style:italic;font-size:1.3rem;line-height:1.55;margin:0 0 .75rem}
.quote cite{font-style:normal;font-size:.9rem;color:var(--muted)}

/* cards */
.cards{display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fit,minmax(20rem,1fr))}
.card{background:var(--card);border:1px solid var(--rule);border-radius:6px;padding:1.5rem}
.card h3{margin:0 0 .5rem;font-size:1.25rem}
.card p{margin:.5rem 0;color:var(--ink-2);font-size:.97rem}
.tags{display:flex;flex-wrap:wrap;gap:.4rem;margin:1rem 0 0;padding:0;list-style:none}
.tags li{font-size:.78rem;padding:.15rem .6rem;border-radius:99px;background:var(--paper-2);color:var(--ink-2);border:1px solid var(--rule)}
.status{display:inline-block;font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--accent);margin-bottom:.5rem}
.card .links{margin-top:1.1rem}

/* pages */
.page{padding:3rem 0 4rem}
.page-head{margin-bottom:2rem}
.prose{max-width:var(--read)}
.prose.wide{max-width:50rem}
.prose p,.prose li{font-size:1.05rem}
.prose ul{padding-left:1.2rem}
.prose li{margin:.35rem 0}
.prose hr{border:0;border-top:1px solid var(--rule);margin:2.5rem 0}
.story{font-family:var(--serif)}
.story p{font-size:1.15rem;line-height:1.8}
.story h2{margin-top:2.8em}
.story h3{font-style:italic;font-weight:500;color:var(--primary-ink)}
.story em{color:var(--ink-2)}

/* publications */
.pubs{max-width:52rem}
.pubs h2{margin:2.6em 0 .3em;padding-top:.6em;border-top:1px solid var(--rule)}
.pubs h2:first-of-type{border:0;margin-top:1.5em}
.pubs h3{font-family:var(--sans);font-size:.85rem;letter-spacing:.12em;color:var(--muted);text-transform:uppercase;margin:1.6em 0 .5em;font-weight:600}
.pub{margin:0 0 1rem;padding-left:1.5rem;text-indent:-1.5rem;font-size:.99rem;line-height:1.6;color:var(--ink-2);break-inside:avoid}
.pub strong{color:var(--ink);font-weight:600}
.pub .doi{font-size:.85rem;margin-left:.35rem;white-space:nowrap}
.badge{display:inline-block;margin-left:.4rem;text-indent:0;font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;padding:.05rem .45rem;border-radius:3px;background:var(--accent-soft);color:var(--accent);font-weight:600;vertical-align:.1em}
.toc{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;list-style:none;margin:1rem 0 0;padding:0;font-size:.92rem}

/* footer */
.site-footer{border-top:1px solid var(--rule);background:var(--paper-2);padding:2.5rem 0;font-size:.92rem;color:var(--muted)}
.site-footer .wrap{display:grid;gap:1.5rem 3rem;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr))}
.site-footer h2{font-family:var(--sans);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;margin:0 0 .6rem;color:var(--ink-2)}
.site-footer p{margin:.2rem 0}
.copy{grid-column:1/-1;font-size:.82rem}

@media (max-width:720px){
  .hero{padding:2rem 0 1.5rem}
  .hero .wrap{grid-template-columns:1fr;gap:1.5rem}
  .portrait{max-width:11rem;aspect-ratio:1;border-radius:50%}
  .lede{font-size:1.15rem}
  .brand span{display:block;margin:0}
}
@media print{.site-header,.site-footer,.links{display:none}body{background:#fff;color:#000}}