:root{
    --white:#ffffff;
    --off:#F5F5F7;
    --ink:#1D1D1F;
    --gray:#6E6E73;
    --gray-light:#86868B;
    --line:#D2D2D7;
    --blue:#0071E3;
    --blue-dark:#0058B0;
    --max:1100px;
    --maxw:780px;
  }

  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    font-family:'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color:var(--ink);
    background:var(--white);
    line-height:1.47;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,h4{
    font-family:'Inter Tight', 'Inter', sans-serif;
    letter-spacing:-0.02em;
    line-height:1.05;
  }
  a{ color:inherit; text-decoration:none; }
  ::selection{ background:var(--blue); color:#fff; }
  img{ max-width:100%; display:block; }

  .wrap{ max-width:var(--max); margin:0 auto; padding:0 24px; }
  .narrow{ max-width:var(--maxw); margin:0 auto; padding:0 24px; }

  @media (max-width:600px){ .wrap, .narrow{ padding:0 20px; } }

  /* ---------------- Nav ---------------- */
  nav{
    position:fixed; top:0; left:0; right:0; z-index:100;
    background:rgba(255,255,255,0.8);
    -webkit-backdrop-filter:saturate(180%) blur(20px);
    backdrop-filter:saturate(180%) blur(20px);
    border-bottom:1px solid rgba(0,0,0,0.06);
  }
  nav .wrap{ display:flex; align-items:center; justify-content:space-between; height:52px; max-width:1200px; }
  .nav-name{ font-size:13px; font-weight:600; letter-spacing:-0.01em; }
  .nav-links{ display:flex; gap:30px; }
  .nav-links a{ font-size:12.5px; color:var(--gray); transition:color .15s; }
  .nav-links a:hover{ color:var(--ink); }
  .nav-links a.active{ color:var(--ink); }

  .nav-toggle{
    display:none;
    -webkit-appearance:none; appearance:none;
    background:none; border:none; padding:8px; margin:0 -8px;
    cursor:pointer;
    -webkit-tap-highlight-color:transparent;
    touch-action:manipulation;
  }
  .nav-toggle .bar{
    display:block; width:20px; height:1.5px; background:var(--ink);
    margin:5px 0; transition:transform .2s ease, opacity .2s ease;
  }
  .nav-toggle[aria-expanded="true"] .bar:nth-child(1){ transform:translateY(6.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .bar:nth-child(2){ opacity:0; }
  .nav-toggle[aria-expanded="true"] .bar:nth-child(3){ transform:translateY(-6.5px) rotate(-45deg); }

  @media (max-width:760px){
    .nav-toggle{ display:block; }
    .nav-links{
      display:flex; flex-direction:column; align-items:center; justify-content:center;
      gap:28px;
      position:fixed; top:52px; left:0; right:0;
      height:calc(100vh - 52px);
      height:calc(100dvh - 52px);
      background:rgba(255,255,255,0.99);
      opacity:0; visibility:hidden; transform:translateY(-8px);
      transition:opacity .25s ease, transform .25s ease, visibility 0s linear .25s;
    }
    .nav-links.open{
      opacity:1; visibility:visible; transform:translateY(0);
      transition:opacity .25s ease, transform .25s ease;
    }
    .nav-links a{ font-size:22px; color:var(--ink); }
  }
  body.nav-open{ overflow:hidden; }

  /* ---------------- Hero ---------------- */
  .hero{
    padding:132px 0 72px;
  }
  .hero-layout{
    display:grid;
    grid-template-columns:minmax(0, 1fr) minmax(260px, 380px);
    gap:56px;
    align-items:center;
  }
  .hero-copy{
    text-align:left;
  }
  .hero .eyebrow{
    font-size:15px; font-weight:600; color:var(--blue); margin-bottom:14px;
  }
  .hero h1{
    font-size:clamp(38px, 6.4vw, 78px);
    font-weight:700;
    color:var(--ink);
    margin-bottom:16px;
  }
  .hero .sub{
    font-size:clamp(18px, 2.4vw, 24px);
    color:var(--gray);
    font-weight:400;
    max-width:640px;
    margin:0 0 36px;
    line-height:1.4;
  }
  .badge-row{ display:flex; flex-direction:column; gap:8px; align-items:flex-start; margin-bottom:28px; }
  .badge{
    display:inline-flex; align-items:center;
    font-size:17px; font-weight:500; color:var(--gray);
  }

  .cta-row{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }
  .hero .cta-row{ justify-content:flex-start; }
  .btn{
    display:inline-flex; align-items:center; gap:6px;
    font-size:16px; font-weight:400;
    padding:11px 22px; border-radius:980px;
    transition:all .15s;
  }
  .btn-primary{ background:var(--blue); color:#fff; }
  .btn-primary:hover{ background:var(--blue-dark); }
  .btn-secondary{ color:var(--blue); }
  .btn-secondary:hover{ text-decoration:underline; }

  .hero-photo-stage{
    position:relative;
    align-self:end;
    overflow:hidden;
  }
  .hero-photo-stage img{
    display:block;
    margin:0;
    width:100%;
    height:auto;
    filter:drop-shadow(0 30px 40px rgba(0,0,0,0.14));
  }
  @media (max-width:900px){
    .hero{ padding-top:116px; text-align:center; }
    .hero-layout{ grid-template-columns:1fr; gap:36px; }
    .hero-copy{ text-align:center; }
    .hero .sub{ margin-left:auto; margin-right:auto; }
    .badge-row{ align-items:center; }
    .hero .cta-row{ justify-content:center; }
    .hero-photo-stage{ max-width:360px; margin:0 auto; }
  }

  /* ---------------- Section shell ---------------- */
  section{ padding:120px 0; }
  @media (max-width:760px){ section{ padding:80px 0; } }
  .on-off{ background:var(--off); }
  .contrib-band{ padding-top:64px; }
  @media (max-width:760px){ .contrib-band{ padding-top:48px; } }
  .head{ text-align:center; max-width:640px; margin:0 auto 64px; }
  .head .kicker{ font-size:14px; font-weight:600; color:var(--blue); margin-bottom:12px; }
  .head h2{ font-size:clamp(30px,4.4vw,48px); font-weight:700; margin-bottom:16px; }
  .head p{ font-size:19px; color:var(--gray); line-height:1.5; }

  .reveal{ opacity:0; transform:translateY(24px); transition:opacity .7s ease, transform .7s ease; }
  .reveal.in-view{ opacity:1; transform:translateY(0); }

  /* ---------------- Traits ---------------- */
  .trait-grid{
    display:grid; grid-template-columns:repeat(3, 1fr); gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    border-radius:18px;
    overflow:hidden;
  }
  @media (max-width:860px){ .trait-grid{ grid-template-columns:repeat(2,1fr); } }
  @media (max-width:560px){ .trait-grid{ grid-template-columns:1fr; } }
  .trait{
    background:var(--white);
    padding:40px 32px;
  }
  .trait .icon{
    width:34px; height:34px; margin-bottom:22px;
    color:var(--blue);
  }
  .trait-photo{
    width:100%; margin-bottom:24px;
    aspect-ratio:4/3; object-fit:cover; display:block;
    border-radius:12px;
  }
  .trait h3{ font-size:20px; font-weight:600; margin-bottom:10px; }
  .trait p{ font-size:15px; color:var(--gray); line-height:1.55; }

  /* ---------------- Stats ---------------- */
  .stat-grid{
    display:grid; grid-template-columns:repeat(3, 1fr); gap:48px 24px;
    text-align:center;
  }
  @media (max-width:760px){ .stat-grid{ grid-template-columns:repeat(2,1fr); gap:40px 20px;} }
  .stat .n{
    font-family:'Inter Tight', sans-serif;
    font-size:clamp(40px,5.6vw,60px); font-weight:700; color:var(--ink);
    letter-spacing:-0.02em;
    font-variant-numeric:tabular-nums;
  }
  .stat .l{ font-size:14.5px; color:var(--gray); margin-top:8px; line-height:1.4; }

  /* ---------------- Leadership ---------------- */
  .lead-cols{ display:grid; grid-template-columns:1fr 285px; gap:40px; align-items:start; max-width:1080px; margin:0 auto; }
  .lead-photos{ display:flex; flex-direction:column; gap:16px; position:sticky; top:100px; }
  .lead-photos img{ width:100%; aspect-ratio:4/3; object-fit:cover; border-radius:16px; display:block; }
  @media (max-width:700px){
    .lead-cols{ grid-template-columns:1fr; }
    .lead-photos{ position:static; flex-direction:row; flex-wrap:wrap; }
    .lead-photos img{ width:calc(50% - 8px); }
  }
  .lead-list{ min-width:0; }
  .lead-item{
    display:grid; grid-template-columns:1fr auto; align-items:baseline;
    gap:4px 16px;
    padding:24px 0; border-top:1px solid var(--line);
  }
  .lead-list .lead-item:last-child{ border-bottom:1px solid var(--line); }
  .lead-role{ font-size:19px; font-weight:600; grid-column:1; }
  .lead-role span{ font-weight:400; color:var(--gray); font-size:16px; }
  .lead-org{ font-size:14px; color:var(--gray); grid-column:1; }
  .lead-yr{ font-size:14px; color:var(--gray-light); grid-column:2; grid-row:1 / span 2; align-self:center; white-space:nowrap; font-variant-numeric:tabular-nums; }
  @media (max-width:600px){
    .lead-item{ grid-template-columns:1fr; }
    .lead-yr{ grid-column:1; grid-row:auto; margin-top:6px; }
  }
  .contrib-panel .head{ margin-bottom:44px; }
  .contrib-grid{
    display:grid; grid-template-columns:repeat(3, 1fr); gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    border-radius:18px;
    overflow:hidden;
  }
  @media (max-width:860px){ .contrib-grid{ grid-template-columns:repeat(2,1fr); } }
  @media (max-width:560px){ .contrib-grid{ grid-template-columns:1fr; } }
  .contrib-card{
    background:var(--white);
    padding:30px 26px;
    min-height:220px;
  }
  .contrib-card .num{
    font-size:13px; font-weight:700; color:var(--blue);
    margin-bottom:18px; font-variant-numeric:tabular-nums;
  }
  .contrib-card h3{ font-size:19px; font-weight:600; margin-bottom:10px; }
  .contrib-card p{ font-size:14.5px; color:var(--gray); line-height:1.55; }

  /* ---------------- BEAM ---------------- */
  .beam-row{ display:grid; grid-template-columns:repeat(4,1fr); }
  @media (max-width:820px){ .beam-row{ grid-template-columns:repeat(2,1fr); } }
  .beam-item{
    padding:36px 28px;
    border-left:1px solid var(--line);
  }
  .beam-item:first-child{ border-left:none; }
  @media (max-width:820px){
    .beam-item:nth-child(odd){ border-left:none; }
    .beam-item{ border-top:1px solid var(--line); }
    .beam-item:nth-child(-n+2){ border-top:none; }
  }
  .beam-item .letter{
    font-family:'Inter Tight', sans-serif;
    font-size:15px; font-weight:700; color:var(--blue);
    margin-bottom:16px; letter-spacing:0.02em;
  }
  .beam-item h3{ font-size:19px; font-weight:600; margin-bottom:10px; }
  .beam-item p{ font-size:14.5px; color:var(--gray); line-height:1.55; }

  /* ---------------- Teaching ---------------- */
  .section-photo{
    width:100%; aspect-ratio:2.5/1; object-fit:cover;
    border-radius:20px; margin-bottom:56px;
  }
  .course-chip-row{ display:flex; flex-wrap:wrap; gap:10px; justify-content:center; margin-bottom:20px; }
  .course-chip{
    font-size:14px; padding:9px 16px; border-radius:980px;
    border:1px solid var(--line); color:var(--ink);
    background:var(--white);
  }
  .teach-note{ text-align:center; font-size:14px; color:var(--gray-light); margin-bottom:80px; }

  .eval-block{ display:grid; grid-template-columns:280px 1fr; gap:60px; align-items:center; }
  @media (max-width:760px){ .eval-block{ grid-template-columns:1fr; gap:32px; text-align:center; } }
  .eval-num{
    font-family:'Inter Tight', sans-serif;
    font-size:clamp(52px,7vw,80px); font-weight:700; color:var(--ink); line-height:1;
  }
  .eval-num span{ font-size:0.4em; color:var(--gray); font-weight:500; }
  .eval-cap{ font-size:15px; color:var(--gray); margin-top:12px; }
  .chart-wrap{ }
  .chart-svg{ width:100%; height:auto; display:block; }
  .chart-caption{ font-size:12.5px; color:var(--gray-light); margin-top:10px; text-align:right; }
  @media (max-width:760px){ .chart-caption{ text-align:center; } }

  /* ---------------- Research ---------------- */
  .research-grid{
    display:grid; grid-template-columns:repeat(3,1fr); gap:1px;
    background:var(--line); border:1px solid var(--line); border-radius:18px; overflow:hidden;
    margin-bottom:44px;
  }
  @media (max-width:760px){ .research-grid{ grid-template-columns:1fr; } }
  .rcard{ background:var(--white); padding:34px 28px; text-align:center; }
  .rcard .src{ font-size:13px; font-weight:600; color:var(--blue); margin-bottom:18px; letter-spacing:0.02em; }
  .rcard .big{ font-family:'Inter Tight', sans-serif; font-size:38px; font-weight:700; }
  .rcard .sub{ font-size:12.5px; color:var(--gray); margin-top:4px; }
  .rcard .mini-row{ display:flex; justify-content:center; gap:22px; margin-top:16px; padding-top:16px; border-top:1px solid var(--off); }
  .rcard .mini{ text-align:center; }
  .rcard .mini b{ display:block; font-size:17px; font-weight:700; }
  .rcard .mini span{ font-size:11px; color:var(--gray-light); }
  .link-row{ display:flex; justify-content:center; gap:28px; flex-wrap:wrap; }
  .link-row a{ font-size:15px; color:var(--blue); }
  .link-row a:hover{ text-decoration:underline; }

  .research-row{
    display:grid; grid-template-columns:1fr 300px; gap:48px; align-items:start;
    margin-top:56px;
  }
  .research-summary{
    margin:0; text-align:left; font-size:17px; color:var(--gray); line-height:1.65;
  }
  .research-summary strong{ color:var(--ink); font-weight:600; }
  .research-photo{
    width:100%; aspect-ratio:3/4; object-fit:cover; border-radius:16px;
  }
  @media (max-width:800px){
    .research-row{ grid-template-columns:1fr; gap:28px; }
    .research-row .research-photo{ order:-1; max-width:320px; margin:0 auto; }
  }

  /* ---------------- Selected publications ---------------- */
  .pub-list{ max-width:820px; margin:0 auto; }
  .pub-item{ display:flex; gap:20px; padding:20px 0; border-top:1px solid var(--line); }
  .pub-list .pub-item:last-child{ border-bottom:1px solid var(--line); }
  .pub-item .yr{ font-size:14px; color:var(--gray-light); flex:0 0 52px; padding-top:2px; font-variant-numeric:tabular-nums; }
  .pub-item .txt b{ display:block; font-size:15.5px; font-weight:600; line-height:1.4; margin-bottom:5px; }
  .pub-item .txt span{ font-size:13.5px; color:var(--gray); line-height:1.55; }
  .pub-item .txt span a{ color:var(--blue); }
  .pub-item .txt span a:hover{ text-decoration:underline; }
  @media (max-width:600px){
    .pub-item{ flex-direction:column; gap:6px; }
    .pub-item .yr{ flex:none; }
  }
  .pub-note{ text-align:center; margin-top:32px; font-size:14px; color:var(--gray-light); }

  /* ---------------- IP & trademarks ---------------- */
  .ip-grid{
    display:grid; grid-template-columns:repeat(2, 1fr); gap:1px;
    background:var(--line); border:1px solid var(--line); border-radius:18px; overflow:hidden;
  }
  @media (max-width:700px){ .ip-grid{ grid-template-columns:1fr; } }
  .ip-card{ background:var(--white); padding:32px 28px; }
  .ip-card .cat{ font-size:12.5px; font-weight:600; color:var(--blue); letter-spacing:0.04em; text-transform:uppercase; margin-bottom:14px; }
  .ip-card h3{ font-size:18px; font-weight:600; margin-bottom:10px; line-height:1.35; }
  .ip-card .meta{ font-size:13.5px; color:var(--gray); font-variant-numeric:tabular-nums; }

  /* ---------------- Recognition ---------------- */
  .rec-cols{ display:grid; grid-template-columns:280px 1fr 1fr; gap:48px; align-items:start; }
  @media (max-width:900px){ .rec-cols{ grid-template-columns:1fr; gap:36px; } }
  .rec-photo{
    width:100%; aspect-ratio:4/5; object-fit:cover; border-radius:16px;
  }
  @media (max-width:900px){ .rec-photo{ max-width:320px; margin:0 auto; } }
  .rec-col h3{ font-size:13px; font-weight:600; color:var(--gray-light); text-transform:uppercase; letter-spacing:0.06em; margin-bottom:22px; }
  .rec-item{ display:flex; gap:18px; padding:14px 0; border-top:1px solid var(--line); }
  .rec-col .rec-item:last-child{ border-bottom:1px solid var(--line); }
  .rec-item .yr{ font-size:14px; color:var(--gray-light); flex:0 0 48px; padding-top:1px; }
  .rec-item .txt b{ display:block; font-size:15px; font-weight:500; }
  .rec-item .txt span{ font-size:13px; color:var(--gray); }
  .rec-more{ text-align:center; margin-top:36px; font-size:14px; color:var(--gray-light); }

  .mentor-photos{ display:flex; gap:16px; margin-bottom:56px; }
  .mentor-photos img{
    flex:1 1 0; min-width:0; aspect-ratio:4/3; object-fit:cover;
    border-radius:16px; display:block;
  }
  @media (max-width:700px){
    .mentor-photos{ flex-wrap:wrap; }
    .mentor-photos img{ flex:1 1 calc(50% - 8px); }
  }

  /* ---------------- Engagement ---------------- */
  .eng-wrap{ display:grid; grid-template-columns:1fr 285px; gap:40px; align-items:start; }
  @media (max-width:900px){ .eng-wrap{ grid-template-columns:1fr; } }
  .eng-cols{ display:grid; grid-template-columns:1fr 1fr; gap:48px; align-items:start; }
  @media (max-width:900px){ .eng-cols{ grid-template-columns:1fr; gap:36px; } }
  .eng-col h3{ font-size:13px; font-weight:600; color:var(--gray-light); text-transform:uppercase; letter-spacing:0.06em; margin-bottom:22px; }
  .eng-item{ display:flex; gap:18px; padding:14px 0; border-top:1px solid var(--line); }
  .eng-col .eng-item:last-child{ border-bottom:1px solid var(--line); }
  .eng-item .yr{ font-size:14px; color:var(--gray-light); flex:0 0 48px; padding-top:1px; }
  .eng-item .txt b{ display:block; font-size:15px; font-weight:500; }
  .eng-item .txt span{ font-size:13px; color:var(--gray); }
  .eng-more{ text-align:center; margin-top:36px; font-size:14px; color:var(--gray-light); }

  /* ---------------- Contact ---------------- */
  .contact{ text-align:center; }
  .contact h2{ font-size:clamp(32px,5vw,54px); font-weight:700; margin-bottom:18px; }
  .contact p{ font-size:19px; color:var(--gray); max-width:520px; margin:0 auto 40px; }
  .contact-links{ margin-top:56px; display:flex; justify-content:center; gap:32px; flex-wrap:wrap; }
  .contact-links a{ font-size:14px; color:var(--gray); }
  .contact-links a:hover{ color:var(--ink); }
  .contact-recognition-logos{
    margin:64px auto 0;
    display:flex; justify-content:center; align-items:center; gap:40px; flex-wrap:wrap;
  }
  .contact-recognition-logos img{ height:140px; width:140px; object-fit:contain; }
  @media (max-width:600px){
    .contact-recognition-logos img{ height:104px; width:104px; }
  }

  footer{ padding:32px 0; border-top:1px solid var(--line); text-align:center; }
  footer p{ font-size:12px; color:var(--gray-light); }

  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
    .reveal{ transition:none; opacity:1; transform:none; }
  }