/* Xiaozhi Yang — academic site */
@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,600;1,6..72,400&family=Inter:wght@400;500;600&display=swap');

:root{
  --accent:#7a1f2b;        /* penn maroon */
  --accent-light:#a23a48;
  --accent-soft:#f3ebe9;
  --ink:#20242a;
  --muted:#646b73;
  --line:#e8e4df;
  --bg:#ffffff;
  --bg-soft:#faf7f4;
  --max:940px;
  --serif:"Newsreader",Georgia,serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--serif);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none;transition:color .15s;}
a:hover{color:var(--accent-light);}

/* nav */
header.site{
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(10px);
  position:sticky;top:0;z-index:20;
}
.nav-inner{
  max-width:var(--max);margin:0 auto;padding:15px 24px;
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;
}
.brand{font-family:var(--serif);font-weight:600;font-size:1.15rem;color:var(--ink);letter-spacing:-.01em;}
.brand:hover{color:var(--accent);}
nav.menu a{
  color:var(--muted);margin-left:26px;font-size:.93rem;font-weight:500;
  position:relative;padding-bottom:3px;
}
nav.menu a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;
  background:var(--accent);transition:width .2s;
}
nav.menu a:hover{color:var(--accent);}
nav.menu a:hover::after,nav.menu a.active::after{width:100%;}
nav.menu a.active{color:var(--accent);}

main{max-width:var(--max);margin:0 auto;padding:46px 24px 90px;}

h1{font-family:var(--serif);font-size:2.4rem;line-height:1.15;margin:0 0 6px;letter-spacing:-.02em;}
h2.section{
  font-family:var(--serif);font-weight:600;font-size:1.4rem;
  margin:48px 0 18px;color:var(--ink);letter-spacing:-.01em;
  display:flex;align-items:center;gap:14px;
}
h2.section::after{content:"";flex:1;height:1px;background:var(--line);}
.lead{color:var(--muted);font-size:1.08rem;}
p{margin:0 0 18px;}

/* hero */
.hero{
  display:flex;gap:40px;align-items:center;flex-wrap:wrap;
  background:linear-gradient(135deg,var(--bg-soft),#fff);
  border:1px solid var(--line);border-radius:18px;
  padding:34px;margin-bottom:8px;
}
.hero img{
  width:340px;height:340px;max-width:100%;object-fit:cover;border-radius:14px;flex-shrink:0;
  box-shadow:0 10px 30px rgba(122,31,43,.16);
}
.hero h1{margin-bottom:8px;}
.hero .role{color:var(--accent);font-weight:600;margin:0 0 2px;font-size:1.1rem;}
.hero .where{color:var(--muted);margin:0 0 18px;font-size:1.02rem;}
.links{display:flex;flex-wrap:wrap;gap:10px;margin:0;}
.links a{
  display:inline-flex;align-items:center;
  border:1px solid var(--line);border-radius:999px;
  padding:7px 16px;font-size:.9rem;font-weight:500;color:var(--ink);
  background:#fff;transition:all .15s;
}
.links a:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft);}

/* publications */
.pub{
  padding:18px 20px;margin:10px 0;border:1px solid var(--line);border-radius:12px;
  background:#fff;transition:box-shadow .15s,border-color .15s,transform .15s;
}
.pub:hover{box-shadow:0 6px 22px rgba(0,0,0,.06);border-color:#dcd6cf;transform:translateY(-1px);}
.pub .title{font-family:var(--serif);font-weight:600;font-size:1.12rem;line-height:1.35;margin-bottom:3px;}
.pub .venue{color:var(--muted);font-style:italic;font-size:.95rem;}
.pub .meta{font-size:.92rem;color:var(--ink);margin-bottom:2px;}
.tag{
  display:inline-block;background:var(--accent-soft);border:1px solid #e7d4d2;
  color:var(--accent);font-size:.72rem;font-weight:600;letter-spacing:.02em;
  padding:2px 10px;border-radius:999px;margin-left:8px;vertical-align:middle;
}

/* two-col list (talks/awards) */
.entry{display:flex;justify-content:space-between;gap:20px;padding:11px 0;
  border-bottom:1px solid var(--line);}
.entry:last-child{border-bottom:none;}
.entry .what{color:var(--ink);}
.entry .when{color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums;font-size:.95rem;}

.chips{display:flex;flex-wrap:wrap;gap:10px;}
.chips span{
  display:inline-block;background:var(--bg-soft);border:1px solid var(--line);
  padding:7px 15px;border-radius:999px;font-size:.9rem;color:var(--ink);
}

/* representative work */
.rtheme{
  font-family:var(--serif);font-weight:600;font-size:1.18rem;color:var(--accent);
  margin:34px 0 2px;letter-spacing:-.01em;
}
.rtheme-lead{color:var(--muted);font-size:.98rem;margin:0 0 12px;}
.rwork{
  display:flex;gap:28px;align-items:center;
  padding:22px;margin:14px 0;border:1px solid var(--line);border-radius:14px;
  background:#fff;transition:box-shadow .15s,border-color .15s;
}
.rwork:hover{box-shadow:0 8px 26px rgba(0,0,0,.07);border-color:#dcd6cf;}
.rfig{
  width:220px;height:170px;flex-shrink:0;border-radius:10px;overflow:hidden;
  border:1px solid var(--line);background:var(--bg-soft);
}
.rfig img{width:100%;height:100%;object-fit:contain;display:block;background:#fff;}
.rfig-empty{
  position:relative;background:
    repeating-linear-gradient(45deg,var(--bg-soft),var(--bg-soft) 12px,#f4efe9 12px,#f4efe9 24px);
}
.rfig-empty::after{
  content:"Figure";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:#b9b0a6;font-size:.85rem;letter-spacing:.05em;
}
.rwork .title{font-family:var(--serif);font-weight:600;font-size:1.18rem;line-height:1.3;margin-bottom:4px;}
.rwork .meta{color:var(--muted);font-size:.92rem;margin-bottom:8px;}
.rwork .summary{margin:0 0 10px;font-size:.98rem;}
.rwork .links{margin:0;}

@media(max-width:640px){
  .rwork{flex-direction:column;align-items:stretch;text-align:left;}
  .rfig{width:100%;height:180px;}
}

.hero img.cat-portrait{width:230px;height:230px;}
.hero .cat-about{margin:16px 0 0;font-size:.98rem;color:var(--ink);max-width:46ch;}

.inline-icon,
.hero img.inline-icon{
  width:0.85em;height:0.85em;vertical-align:-0.08em;border-radius:2px;margin:0 1px;
  box-shadow:none;flex-shrink:0;display:inline;
}

/* cat journal */
.cat-hero{margin:8px 0 4px;}
.cat-hero img{
  display:block;width:100%;max-width:420px;margin:0 auto;height:auto;border-radius:18px;
  border:1px solid var(--line);box-shadow:0 10px 30px rgba(0,0,0,.12);
}
.cat-timeline{
  position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
  margin-top:24px;padding-top:22px;
}
.cat-timeline::before{
  content:"";position:absolute;left:0;right:0;top:7px;height:2px;background:var(--line);
}
.cat-entry{
  position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;
}
.cat-entry::before{
  content:"";position:absolute;top:-22px;left:50%;transform:translateX(-50%);
  width:13px;height:13px;border-radius:50%;background:var(--accent);
  border:3px solid #fff;box-shadow:0 0 0 1px var(--line);
}
.cat-photo{width:100%;}
.cat-photo img{
  display:block;width:100%;height:260px;object-fit:cover;object-position:center 30%;border-radius:12px;background:var(--bg-soft);
  border:1px solid var(--line);transition:transform .2s,box-shadow .2s;
}
.cat-photo img.contain{object-fit:contain;}
.cat-photo img.face-top{object-position:center top;}
.cat-photo img:hover{transform:translateY(-3px) rotate(-1deg);box-shadow:0 10px 26px rgba(0,0,0,.12);}
.cat-age{
  font-family:var(--serif);font-weight:600;font-size:1.05rem;color:var(--accent);margin:10px 0 4px;
}
.cat-note p{margin:0;font-size:.9rem;}
@media(max-width:640px){
  .cat-timeline{grid-template-columns:1fr;gap:28px;padding-top:0;}
  .cat-timeline::before{display:none;}
  .cat-entry::before{display:none;}
  .cat-photo img{height:200px;}
}

/* cv embed */
.cv-frame{width:100%;height:85vh;border:1px solid var(--line);border-radius:12px;}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:11px 22px;
  border-radius:999px;font-size:.95rem;font-weight:500;margin-bottom:18px;
  box-shadow:0 4px 14px rgba(122,31,43,.22);transition:background .15s,transform .15s;}
.btn:hover{background:var(--accent-light);color:#fff;transform:translateY(-1px);}

footer.site{border-top:1px solid var(--line);color:var(--muted);font-size:.85rem;
  text-align:center;padding:28px;}

@media(max-width:640px){
  body{font-size:16px;}
  h1{font-size:1.95rem;}
  .hero{padding:24px;gap:24px;justify-content:center;text-align:center;}
  .hero img{width:220px;height:220px;}
  .links{justify-content:center;}
  nav.menu a{margin-left:16px;}
}