:root{
    --bg:#FFFFFF;
    --band:#F4F7FC;
    --card:#FFFFFF;
    --border:#E6EBF2;
    --border-2:#D6E0EC;
    --ink:#1F2530;
    --ink-soft:#454C58;
    --muted:#69707C;
    --primary:#2A6BD4;
    --primary-dark:#1F5099;
    --primary-tint:#EAF1FC;
    --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
    --shadow:0 1px 3px rgba(20,30,50,.06),0 1px 2px rgba(20,30,50,.04);
    --shadow-hover:0 10px 26px rgba(20,40,80,.10);
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;scroll-padding-top:74px;-webkit-text-size-adjust:100%;}
  body{margin:0;font-family:'Inter',system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;}
  a{color:var(--primary);}
  img{max-width:100%;}
  :focus-visible{outline:2px solid var(--primary);outline-offset:3px;border-radius:3px;}
  .wrap{max-width:980px;margin:0 auto;padding:0 24px;}

  /* nav */
  .nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--border);}
  .nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;}
  .nav-brand{font-weight:700;color:var(--ink);text-decoration:none;font-size:1.04rem;letter-spacing:-.01em;}
  .nav-links{display:flex;gap:26px;}
  .nav-links a{color:var(--ink-soft);text-decoration:none;font-size:.92rem;font-weight:500;transition:color .15s;}
  .nav-links a:hover{color:var(--primary);}

  /* sections */
  .section{padding:clamp(52px,7vh,84px) 0;}
  .section.band{background:var(--band);border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
  .sec-title{text-align:center;font-size:clamp(1.5rem,3vw,1.95rem);font-weight:700;letter-spacing:-.01em;margin:0 0 8px;color:var(--ink);}
  .sec-rule{width:46px;height:3px;background:var(--primary);border-radius:2px;margin:0 auto 34px;}

  /* bio */
  .bio{padding:clamp(48px,7vh,80px) 0 clamp(48px,7vh,72px);}
  .bio-grid{display:grid;grid-template-columns:300px 1fr;gap:52px;align-items:start;}
  .bio-id{text-align:center;}
  .avatar{width:208px;height:208px;border-radius:50%;object-fit:cover;display:block;margin:0 auto 20px;box-shadow:0 8px 26px rgba(20,40,80,.18);border:5px solid #fff;outline:1px solid var(--border);}
  .bio-name{font-size:clamp(1.7rem,3.4vw,2.05rem);font-weight:700;letter-spacing:-.015em;margin:0;color:var(--ink);}
  .bio-role{margin:9px 0 2px;font-weight:600;color:var(--ink-soft);font-size:1rem;}
  .bio-org{font-size:.96rem;}
  .bio-org a{color:var(--primary);text-decoration:none;font-weight:500;}
  .bio-org a:hover{text-decoration:underline;}
  .social{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-top:20px;}
  .social a{width:40px;height:40px;border-radius:50%;border:1px solid var(--border);display:inline-flex;align-items:center;justify-content:center;color:var(--muted);background:#fff;transition:background .2s,color .2s,border-color .2s,transform .2s;}
  .social a:hover{background:var(--primary);border-color:var(--primary);color:#fff;transform:translateY(-2px);}
  .social svg{width:18px;height:18px;}

  .bio-summary{font-size:1.06rem;color:var(--ink-soft);margin:0;line-height:1.72;}
  .cv-btn{display:inline-flex;align-items:center;gap:8px;margin-top:20px;background:var(--primary);color:#fff;text-decoration:none;font-weight:600;font-size:.92rem;padding:10px 18px;border-radius:8px;transition:background .2s;}
  .cv-btn:hover{background:var(--primary-dark);}
  .cv-btn svg{width:16px;height:16px;}
  .bio-sub{margin-top:32px;}
  .bio-sub h3{font-size:.78rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:700;margin:0 0 13px;}
  .chips{display:flex;flex-wrap:wrap;gap:8px;}
  .chip{background:var(--primary-tint);color:var(--primary-dark);font-size:.85rem;font-weight:500;padding:5px 13px;border-radius:999px;}
  .edu-item{padding:11px 0;border-bottom:1px solid var(--border);}
  .edu-item:last-child{border-bottom:none;}
  .edu-degree{font-weight:600;color:var(--ink);font-size:.98rem;}
  .edu-org{color:var(--ink-soft);font-size:.94rem;}
  .edu-date{color:var(--muted);font-size:.84rem;margin-top:2px;}

  /* research mission */
  .mission{max-width:740px;margin:0 auto;text-align:center;}
  .mission p{font-size:1.08rem;color:var(--ink-soft);line-height:1.75;margin:0;}

  /* cards */
  .cards{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
  .card{background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .25s,transform .25s,border-color .25s;display:flex;flex-direction:column;}
  .card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:var(--border-2);}
  .card-cover{display:block;width:100%;aspect-ratio:3/1;}
  .card-cover svg{display:block;width:100%;height:100%;}
  .card-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1;}
  .card-tag{align-self:flex-start;font-size:.73rem;font-weight:600;letter-spacing:.02em;color:var(--primary-dark);background:var(--primary-tint);padding:3px 11px;border-radius:999px;text-decoration:none;}
  .card h3{font-size:1.1rem;font-weight:700;line-height:1.36;margin:13px 0 9px;}
  .card h3 a{color:var(--ink);text-decoration:none;}
  .card h3 a:hover{color:var(--primary);}
  .card p{color:var(--muted);font-size:.93rem;margin:0;line-height:1.62;}
  .card-meta{display:flex;align-items:center;gap:9px;margin-top:16px;color:var(--muted);font-size:.85rem;}
  .card-meta img{width:26px;height:26px;border-radius:50%;object-fit:cover;}
  .card-link{margin-top:14px;color:var(--primary);font-weight:600;font-size:.9rem;text-decoration:none;}
  .card-link:hover{text-decoration:underline;}

  /* publications citation list */
  .cite-wrap{max-width:840px;margin:0 auto;}
  .cite{padding:18px 2px;border-bottom:1px solid var(--border);}
  .cite:last-child{border-bottom:none;}
  .cite p{margin:0;color:var(--ink-soft);font-size:1rem;line-height:1.6;}
  .cite p .title{color:var(--ink);font-weight:600;text-decoration:none;}
  .cite p a.title:hover{color:var(--primary);}
  .cite-venue{color:var(--muted);}
  .cite strong{color:var(--ink);}
  .cite em{color:var(--ink-soft);font-style:italic;}
  .cite-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:11px;}
  .btn-mini{font-size:.8rem;font-weight:500;color:var(--primary);background:#fff;border:1px solid var(--border);padding:4px 11px;border-radius:7px;text-decoration:none;cursor:pointer;transition:background .15s,border-color .15s;display:inline-flex;align-items:center;}
  .btn-mini:hover{background:var(--primary-tint);border-color:var(--border-2);}
  .cite-bib{margin-top:8px;}
  .cite-bib summary{display:inline-flex;align-items:center;font-size:.8rem;font-weight:500;color:var(--primary);background:#fff;border:1px solid var(--border);padding:4px 11px;border-radius:7px;cursor:pointer;list-style:none;width:max-content;transition:background .15s;}
  .cite-bib summary::-webkit-details-marker{display:none;}
  .cite-bib summary:hover{background:var(--primary-tint);}
  .cite-bib pre{margin:10px 0 0;background:#0F1A2A;color:#D6E4F7;font-family:var(--mono);font-size:.78rem;line-height:1.55;padding:15px 17px;border-radius:9px;overflow:auto;}

  /* skills */
  .skills-wrap{max-width:840px;margin:0 auto;}
  .skill-row{display:grid;grid-template-columns:210px 1fr;gap:18px;padding:15px 2px;border-bottom:1px solid var(--border);align-items:baseline;}
  .skill-row:last-child{border-bottom:none;}
  .skill-label{font-weight:600;color:var(--ink);font-size:.95rem;}
  .skill-tags{display:flex;flex-wrap:wrap;gap:8px;}
  @media (max-width:560px){.skill-row{grid-template-columns:1fr;gap:7px;}}

  /* demos */
  .demo-cards{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
  .demo-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:26px;box-shadow:var(--shadow);transition:box-shadow .25s,transform .25s,border-color .25s;}
  .demo-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:var(--border-2);}
  .demo-ico{width:46px;height:46px;border-radius:11px;background:var(--primary-tint);color:var(--primary-dark);display:flex;align-items:center;justify-content:center;margin-bottom:15px;}
  .demo-ico svg{width:23px;height:23px;}
  .demo-card h3{font-size:1.12rem;font-weight:700;margin:0 0 7px;color:var(--ink);}
  .demo-card p{color:var(--muted);font-size:.94rem;margin:0;line-height:1.62;}
  .open-btn{margin-top:18px;display:inline-flex;align-items:center;gap:7px;background:var(--primary);color:#fff;padding:9px 16px;border-radius:8px;text-decoration:none;font-weight:600;font-size:.88rem;transition:background .2s;}
  .open-btn:hover{background:var(--primary-dark);}

  /* news */
  .news-wrap{max-width:760px;margin:0 auto;}
  .news-item{display:grid;grid-template-columns:118px 1fr;gap:20px;padding:15px 0;border-bottom:1px solid var(--border);}
  .news-item:last-child{border-bottom:none;}
  .news-date{color:var(--primary-dark);font-weight:600;font-size:.85rem;white-space:nowrap;}
  .news-text{color:var(--ink-soft);font-size:.98rem;line-height:1.6;}
  .news-text a{color:var(--primary);text-decoration:none;}
  .news-text a:hover{text-decoration:underline;}

  /* contact */
  .contact-wrap{text-align:center;max-width:600px;margin:0 auto;}
  .contact-wrap p{color:var(--ink-soft);font-size:1.06rem;margin:0 0 22px;}

  /* footer */
  footer{border-top:1px solid var(--border);padding:28px 0 46px;text-align:center;}
  .foot{color:var(--muted);font-size:.85rem;}

  /* reveal */
  .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease;}
  .reveal.in{opacity:1;transform:none;}

  @media (max-width:840px){
    .bio-grid{grid-template-columns:1fr;gap:34px;}
    .bio-id{margin:0 auto;max-width:340px;}
  }
  @media (max-width:760px){
    .nav-links{display:none;}
    .cards,.demo-cards{grid-template-columns:1fr;}
  }
  @media (max-width:560px){
    .news-item{grid-template-columns:1fr;gap:4px;}
  }
  @media (prefers-reduced-motion:reduce){
    html{scroll-behavior:auto;}
    .reveal{opacity:1 !important;transform:none !important;transition:none;}
    .card,.demo-card,.social a{transition:none;}
  }

  /* graceful fallback shown if a data file fails to load */
  .load-error{color:var(--muted);font-size:.95rem;text-align:center;margin:0;}

  /* research-impact strip (between bio and research) */
  .impact{padding:clamp(26px,4vh,38px) 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--bg);}
  .impact-stats{display:flex;justify-content:center;flex-wrap:wrap;gap:clamp(26px,6vw,72px);}
  .impact-stat{display:flex;flex-direction:column;align-items:center;line-height:1;}
  .impact-num{font-size:clamp(1.9rem,4.4vw,2.5rem);font-weight:700;letter-spacing:-.02em;color:var(--primary-dark);}
  .impact-label{margin-top:8px;font-size:.76rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600;}
  .impact-src{text-align:center;margin:18px 0 0;font-size:.82rem;color:var(--muted);}
  .impact-src a{color:var(--primary);text-decoration:none;}
  .impact-src a:hover{text-decoration:underline;}

  /* writing / blog */
  .writing-intro{max-width:600px;margin:-14px auto 30px;text-align:center;color:var(--ink-soft);font-size:1.02rem;}
  .writing-wrap{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:14px;}
  .post{display:block;background:var(--card);border:1px solid var(--border);border-radius:13px;padding:20px 22px;box-shadow:var(--shadow);text-decoration:none;transition:box-shadow .25s,transform .25s,border-color .25s;}
  a.post:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:var(--border-2);}
  .post-draft{cursor:default;}
  .post-top{display:flex;align-items:center;gap:11px;margin-bottom:9px;flex-wrap:wrap;}
  .post-tag{font-size:.72rem;font-weight:600;letter-spacing:.02em;color:var(--primary-dark);background:var(--primary-tint);padding:3px 11px;border-radius:999px;}
  .post-date{font-size:.83rem;color:var(--muted);}
  .post-read{font-size:.83rem;color:var(--muted);margin-left:auto;}
  .post-title{font-size:1.12rem;font-weight:700;line-height:1.36;margin:0 0 7px;color:var(--ink);transition:color .15s;}
  a.post:hover .post-title{color:var(--primary);}
  .post-sum{font-size:.93rem;color:var(--muted);margin:0;line-height:1.62;}
  .post-cta{display:inline-block;margin-top:13px;font-size:.86rem;font-weight:600;color:var(--primary);}
  .post-soon{color:var(--muted);font-weight:500;}