:root{
  --purple:#4E2A84;        /* Northwestern Purple = your CV's RGB 78,42,132 */
  --purple-dark:#3a1f63;
  --ink:#1f1b24;
  --muted:#5c5660;
  --bg:#faf8f4;            /* warm off-white */
  --line:#e7e1d8;
  --chip:#f1ebe1;
  --maxw:1100px;
}
*{box-sizing:border-box;}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Source Serif 4",Georgia,serif;font-size:18px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}

/* nav */
nav{position:sticky;top:0;background:rgba(250,248,244,.92);backdrop-filter:blur(6px);
  border-bottom:1px solid var(--line);z-index:10;}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;}
nav .brand{font-family:"Newsreader",serif;font-weight:600;font-size:20px;letter-spacing:.01em;}
nav ul{list-style:none;display:flex;gap:26px;margin:0;padding:0;}
nav a{color:var(--ink);text-decoration:none;font-size:16px;}
nav a:hover{color:var(--purple);}

/* hero */
header.hero{padding:60px 0 38px;}
.hero .wrap{display:grid;grid-template-columns:360px 1fr;gap:48px;align-items:center;}
h1{font-family:"Newsreader",serif;font-weight:600;font-size:46px;line-height:1.05;margin:0 0 10px;letter-spacing:-.01em;}
.role{font-size:19px;color:var(--muted);margin:0 0 3px;}
.status{display:inline-block;margin-top:12px;color:var(--purple);font-weight:600;
  border:1px solid var(--purple);border-radius:999px;padding:4px 14px;font-size:15px;}
.brandline{font-style:italic;font-size:20px;line-height:1.5;margin:22px 0 0;color:#332d39;max-width:34em;}
.tags{margin:18px 0 0;display:flex;flex-direction:column;align-items:flex-start;gap:8px;}
.tag{background:var(--chip);color:#4a4451;border:1px solid var(--line);border-radius:6px;
  padding:4px 11px;font-size:14.5px;}
/* swap the placeholder for a real photo: replace the <div class="photo">…</div>
   with  <img class="photo" src="files/headshot.jpg" alt="Caroline Wang">  */
.photo{width:100%;height:auto;border-radius:8px;border:1px solid var(--line);display:block;}
.btns{margin-top:24px;display:flex;gap:14px;flex-wrap:wrap;}
.btn{display:inline-block;background:var(--purple);color:#fff;text-decoration:none;
  padding:11px 20px;border-radius:6px;font-size:16px;}
.btn:hover{background:var(--purple-dark);}
.btn.ghost{background:transparent;color:var(--purple);border:1px solid var(--purple);}
.meta{margin-top:20px;color:var(--muted);font-size:16px;}
.meta a{color:var(--purple);}
.herotext h1{margin-top:0;}
.herotext .bio{margin:16px 0 0;}

/* sections */
section{padding:34px 0;border-top:1px solid var(--line);}
section.nobordertop{border-top:none;padding-top:46px;}
h2{font-family:"Newsreader",serif;font-weight:600;font-size:28px;margin:0 0 16px;}
.about p{margin:0 0 12px;}
.group{font-family:"Newsreader",serif;font-weight:600;font-size:21px;color:var(--purple-dark);
  margin:28px 0 14px;}
.group:first-of-type{margin-top:6px;}
.paper{margin:0 0 22px;}
.paper .ttl{font-weight:600;font-size:19px;line-height:1.4;}
.paper .ttl a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line);}
.paper .ttl a:hover{color:var(--purple);border-color:var(--purple);}
.badge{display:inline-block;background:var(--purple);color:#fff;font-size:12px;
  letter-spacing:.05em;text-transform:uppercase;border-radius:4px;padding:2px 8px;margin-right:8px;vertical-align:2px;}
.auth{color:var(--muted);font-size:16px;margin:2px 0;}
.auth a{color:var(--purple);text-decoration:none;}
.auth a:hover{text-decoration:underline;}
.award{color:var(--muted);font-size:16px;margin:2px 0;font-style:italic;}
.award a{color:var(--purple);text-decoration:none;}
.award a:hover{text-decoration:underline;}
.abs{font-size:16.5px;color:#332d39;margin:6px 0 0;}
.paper .auth,.paper .award,.paper .links,.paper .abs{margin-left:22px;}
.links{margin-top:7px;}
.links a{color:var(--purple);font-size:15px;margin-right:14px;text-decoration:none;}
.links a:hover{text-decoration:underline;}
.links a.abs-toggle{cursor:pointer;}
.links a.abs-toggle::after{content:" \25B8";font-size:.85em;}      /* ▸ collapsed */
.links a.abs-toggle.open::after{content:" \25BE";}                 /* ▾ expanded */
footer{padding:30px 0 60px;border-top:1px solid var(--line);color:var(--muted);font-size:15px;}
footer a{color:var(--purple);}

/* education */
.edu{margin:0 0 18px;display:flex;justify-content:space-between;gap:20px;align-items:baseline;}
.edu .inst{font-weight:600;margin-bottom:5px;}
.edu .loc{color:var(--muted);font-weight:400;font-size:0.92em;}
.edu .deg{color:var(--muted);font-size:16.5px;line-height:1.5;}
.edu .yr{color:var(--muted);font-size:15px;white-space:nowrap;}

/* hobbies */
.hobbies-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px;margin-top:6px;}
.hobby{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px;}
.hobby .ico{font-size:26px;display:block;margin-bottom:8px;line-height:1;}
.hobby h3{font-family:"Newsreader",serif;font-weight:600;font-size:19px;margin:0 0 6px;color:var(--purple-dark);}
.hobby p{margin:0;font-size:16px;color:#332d39;}

/* hobbies — per-hobby blocks with media */
.hobby-block{margin:0 0 36px;padding-top:26px;border-top:1px solid var(--line);}
.hobby-block:first-of-type{border-top:none;padding-top:4px;}
.hobby-block h3{font-family:"Newsreader",serif;font-weight:600;font-size:23px;margin:0 0 6px;
  color:var(--purple-dark);display:flex;align-items:center;gap:10px;}
.hobby-block h3 .ico{font-size:24px;line-height:1;}
.hobby-block p{margin:0 0 16px;font-size:17px;color:#332d39;}
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;}
.gallery img{width:100%;height:auto;border-radius:8px;border:1px solid var(--line);display:block;}
.gallery .ph{height:130px;border-radius:8px;border:1px dashed #cfc6b6;background:#f3eee5;
  display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;text-align:center;}
.video{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:10px;border:1px solid var(--line);}
.video iframe,.video video{position:absolute;top:0;left:0;width:100%;height:100%;border:0;background:#000;}
.videos{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:4px;}
.video-ph{position:relative;padding-bottom:50%;border-radius:10px;border:1px dashed #cfc6b6;background:#f3eee5;}
.video-ph span{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:var(--muted);font-size:14px;}

@media(max-width:680px){
  .hero .wrap{grid-template-columns:1fr;}
  .photo{width:240px;height:auto;align-self:start;}
  .gallery{grid-template-columns:repeat(2,1fr);}
  .videos{grid-template-columns:1fr;}
  h1{font-size:36px;}nav ul{gap:16px;}
  .edu{flex-direction:column;gap:2px;}
}