/* ===========================================================
   Muskan Jain — personal academic site
   Palette:  ink #143642 · teal #1F5673 · ochre #C97B33
             paper #FBF7F0 · sand #EFE6D6 · slate #4A5A60
   Type:     System serif (headings) · system sans (body) — neutral
   =========================================================== */

   :root{
    --ink:#143642;
    --teal:#1F5673;
    --ochre:#C97B33;
    --ochre-soft:#E0A968;
    --paper:#FCFCFB;
    --sand:#F1F0ED;
    --slate:#4A5A60;
    --line:#E4E4E1;
    --maxw:1080px;
    --serif:Georgia,"Times New Roman",Cambria,"Source Serif Pro",serif;
    --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  }
  
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    font-family:var(--sans);
    color:var(--ink);
    background:var(--paper);
    line-height:1.6;
    font-size:16px;
    -webkit-font-smoothing:antialiased;
  }
  
  /* ---------- Layout ---------- */
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
  section{padding:72px 0}
  
  /* ---------- Header / nav ---------- */
  header.site{
    position:sticky;top:0;z-index:50;
    background:rgba(252,252,251,.88);
    backdrop-filter:saturate(120%) blur(10px);
    border-bottom:1px solid var(--line);
  }
  .nav{
    display:flex;align-items:center;justify-content:space-between;
    max-width:var(--maxw);margin:0 auto;padding:16px 28px;
  }
  .brand{
    font-family:var(--serif);
    font-weight:600;font-size:1.18rem;letter-spacing:.2px;
    color:var(--ink);text-decoration:none;
  }
  .nav ul{list-style:none;display:flex;gap:28px}
  .nav a{
    text-decoration:none;color:var(--slate);font-weight:500;font-size:.97rem;
    position:relative;padding:4px 0;transition:color .2s;
  }
  .nav a:hover{color:var(--ink)}
  .nav a.active{color:var(--ink)}
  .nav a.active::after,.nav a:hover::after{
    content:"";position:absolute;left:0;bottom:-2px;height:2px;width:100%;
    background:var(--ochre);
  }
  .nav-toggle{display:none;background:none;border:0;cursor:pointer;font-size:1.5rem;color:var(--ink)}
  
  /* ---------- Hero / about ---------- */
  .hero{padding-top:64px}
  .hero-grid{display:grid;grid-template-columns:300px 1fr;gap:54px;align-items:start}
  .portrait{
    width:100%;border-radius:6px;display:block;
    box-shadow:0 14px 40px -18px rgba(20,54,66,.5);
    border:6px solid #fff;
  }
  .eyebrow{
    font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;
    color:var(--ochre);font-weight:600;margin-bottom:14px;
  }
  h1{
    font-family:var(--serif);
    font-weight:600;font-size:clamp(1.9rem,4vw,2.6rem);
    line-height:1.1;letter-spacing:-.3px;margin-bottom:8px;
  }
  .subtitle{color:var(--teal);font-size:1.12rem;font-weight:500;margin-bottom:24px}
  .hero p{margin-bottom:16px;max-width:62ch}
  a.inline{color:var(--teal);text-decoration:none;border-bottom:1.5px solid var(--ochre-soft);transition:background .2s}
  a.inline:hover{background:var(--sand)}
  
  /* affiliations */
  .affil{
    margin-top:8px;padding:18px 20px;background:var(--sand);
    border-left:3px solid var(--ochre);border-radius:0 6px 6px 0;font-size:.96rem;
  }
  .affil strong{display:block;font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--slate);margin-bottom:6px}
  
  /* social row */
  .social{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}
  .social a{
    display:inline-flex;align-items:center;gap:8px;
    padding:9px 15px;border:1px solid var(--line);border-radius:999px;
    text-decoration:none;color:var(--ink);font-size:.9rem;font-weight:500;
    background:#fff;transition:all .2s;
  }
  .social a:hover{border-color:var(--ochre);color:var(--ochre);transform:translateY(-1px)}
  
  /* ---------- Section heading w/ animated underline ---------- */
  .section-head{margin-bottom:38px}
  .section-head h2{
    font-family:var(--serif);font-weight:600;
    font-size:clamp(1.5rem,3vw,2rem);display:inline-block;position:relative;
  }
  .section-head h2::after{
    content:"";position:absolute;left:0;bottom:-8px;height:3px;width:0;
    background:var(--ochre);transition:width 1s cubic-bezier(.2,.7,.2,1);
  }
  .section-head.in h2::after{width:100%}
  .section-head .lede{margin-top:18px;color:var(--slate);max-width:none}
  
  /* alt background bands */
  .band{background:linear-gradient(180deg,#fff, #FCFAF4);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
  
  /* ---------- Research (flat, expandable) ---------- */
  .research-group{margin-bottom:54px}
  .research-group > h3.group-title{
    font-family:var(--serif);font-weight:600;font-size:1.5rem;
    padding-bottom:10px;margin-bottom:6px;border-bottom:2px solid var(--line);
  }
  .entry{
    padding:24px 0 22px;border-bottom:1px solid var(--line);
    border-left:3px solid transparent;padding-left:0;transition:border-color .25s,padding-left .25s;
  }
  .entry.open{border-left-color:var(--ochre);padding-left:20px}
  .entry h4{
    font-family:var(--serif);font-weight:600;font-size:1.22rem;
    line-height:1.3;margin-bottom:5px;
  }
  .entry .authors{color:var(--slate);font-size:.97rem;margin-bottom:4px}
  .entry .authors a{color:var(--teal);text-decoration:none;border-bottom:1px solid var(--ochre-soft)}
  .entry .award{color:var(--ochre);font-size:.92rem;font-weight:600;margin-bottom:8px}
  .entry .award a{color:inherit}
  .entry .journal{font-style:italic;color:var(--slate);font-size:.95rem;margin-bottom:8px}
  
  /* link bar:  [ Abstract | Paper | Partners ] */
  .linkbar{display:flex;flex-wrap:wrap;align-items:center;gap:4px;margin-top:6px;font-size:.95rem}
  .linkbar .sep{color:var(--line);margin:0 6px}
  .linkbar a,.linkbar button{
    background:none;border:0;cursor:pointer;font:inherit;color:var(--teal);
    text-decoration:none;padding:2px 0;font-weight:500;
  }
  .linkbar a{border-bottom:1px solid var(--ochre-soft)}
  .linkbar a:hover,.linkbar button:hover{color:var(--ochre)}
  .linkbar .toggle .caret{display:inline-block;transition:transform .25s;font-size:.8em}
  .linkbar .toggle[aria-expanded="true"] .caret{transform:rotate(90deg)}
  
  /* collapsible panels */
  .panel{
    display:grid;grid-template-rows:0fr;overflow:hidden;
    transition:grid-template-rows .3s ease;
  }
  .panel.show{grid-template-rows:1fr;margin-top:14px}
  .panel > div{min-height:0}
  .panel .abstract{color:var(--ink);font-size:.97rem;line-height:1.7;max-width:74ch}
  .panel .partners{font-size:.95rem;color:var(--slate)}
  .panel .partners strong{color:var(--ink)}
  
  /* ---------- Teaching / CV list ---------- */
  .tlist{display:grid;gap:2px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--line)}
  .trow{
    display:grid;grid-template-columns:1fr auto;gap:18px;align-items:baseline;
    background:#fff;padding:18px 24px;
  }
  .trow .course{font-weight:600}
  .trow .course small{display:block;font-weight:400;color:var(--slate);font-size:.9rem;margin-top:2px}
  .trow .years{color:var(--ochre);font-variant-numeric:tabular-nums;font-weight:600;white-space:nowrap}
  
  /* CV download */
  .cv-cta{
    display:inline-flex;align-items:center;gap:10px;margin-top:6px;
    background:var(--ink);color:#fff;text-decoration:none;font-weight:600;
    padding:14px 26px;border-radius:999px;transition:background .2s,transform .2s;
  }
  .cv-cta:hover{background:var(--teal);transform:translateY(-2px)}
  
  /* ---------- Contact ---------- */
  .contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
  .contact-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:30px}
  .contact-card h3{font-family:var(--serif);font-size:1.2rem;margin-bottom:14px}
  .contact-card a{color:var(--teal);text-decoration:none;border-bottom:1px solid var(--ochre-soft)}
  .contact-card a:hover{background:var(--sand)}
  
  /* ---------- Footer ---------- */
  footer.site{
    border-top:1px solid var(--line);background:var(--ink);color:#CBD8DE;
    padding:34px 0;font-size:.88rem;
  }
  footer.site .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
  footer.site a{color:var(--ochre-soft);text-decoration:none}
  
  /* ---------- Responsive ---------- */
  @media(max-width:820px){
    .hero-grid{grid-template-columns:1fr;gap:32px}
    .portrait{max-width:260px}
    .contact-grid{grid-template-columns:1fr}
    .nav ul{
      position:absolute;top:100%;right:0;left:0;flex-direction:column;gap:0;
      background:var(--paper);border-bottom:1px solid var(--line);
      max-height:0;overflow:hidden;transition:max-height .3s;
    }
    .nav ul.open{max-height:340px}
    .nav ul li{padding:0 28px;border-top:1px solid var(--line)}
    .nav ul li a{display:block;padding:14px 0}
    .nav-toggle{display:block}
  }
  
  /* reduced motion */
  @media(prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important}
    .paper{opacity:1;transform:none}
    .section-head h2::after{width:100%;transition:none}
  }
  
  /* ---------- Research entry with photo ---------- */
  .entry-grid{display:grid;grid-template-columns:170px 1fr;gap:26px;align-items:start}
  .entry-grid .entry-photo{
    width:100%;border-radius:8px;display:block;object-fit:cover;aspect-ratio:4/3;
    border:5px solid #fff;box-shadow:0 10px 28px -16px rgba(20,54,66,.5);
  }
  .entry-grid .entry-body{min-width:0}
  @media(max-width:640px){
    .entry-grid{grid-template-columns:1fr;gap:14px}
    .entry-grid .entry-photo{max-width:240px;aspect-ratio:3/2}
  }
  
  /* ---------- Fieldwork gallery ---------- */
  .gallery-intro{margin-bottom:34px;color:var(--slate);max-width:64ch}
  .gallery{
    columns:3;column-gap:16px;
  }
  @media(max-width:820px){.gallery{columns:2}}
  @media(max-width:520px){.gallery{columns:1}}
  .gallery figure{
    break-inside:avoid;margin:0 0 16px;background:#fff;border:1px solid var(--line);
    border-radius:8px;overflow:hidden;
  }
  .gallery img{width:100%;display:block}
  .gallery figcaption{
    padding:10px 14px;font-size:.86rem;color:var(--slate);line-height:1.5;
  }
  .gallery figcaption strong{color:var(--ink);display:block;font-size:.9rem}