:root{
  --bg:#f7f5f0;
  --bg-alt:#efece4;
  --ink:#1b1a17;
  --ink-soft:#4a4740;
  --line:#d9d4c8;
  --accent:#8a3b2a;
  --accent-soft:#c96a4f;
  --card:#ffffff;
  --mono:'JetBrains Mono',monospace;
  --serif:'EB Garamond',Georgia,'Times New Roman',serif;
}
:root[data-theme="dark"]{
  --bg:#0d0d0f;
  --bg-alt:#141417;
  --ink:#efece4;
  --ink-soft:#a8a394;
  --line:#2a2a2e;
  --accent:#e8a084;
  --accent-soft:#c96a4f;
  --card:#17171b;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0d0d0f;
    --bg-alt:#141417;
    --ink:#efece4;
    --ink-soft:#a8a394;
    --line:#2a2a2e;
    --accent:#e8a084;
    --accent-soft:#c96a4f;
    --card:#17171b;
  }
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--serif);
  font-size:19px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  transition:background .3s ease,color .3s ease;
}

.bg-field{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;}
#constellation{width:100%;height:100%;display:block;}

#theme-toggle{
  position:fixed;top:1.4rem;right:1.6rem;z-index:50;
  width:2.6rem;height:2.6rem;border-radius:50%;
  border:1px solid var(--line);background:var(--card);color:var(--ink);
  cursor:pointer;font-size:1rem;display:flex;align-items:center;justify-content:center;
}
#theme-toggle .icon-moon{display:none;}
:root[data-theme="dark"] #theme-toggle .icon-sun{display:none;}
:root[data-theme="dark"] #theme-toggle .icon-moon{display:inline;}

.topnav{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;
  padding:1.1rem 2.4rem;
  background:color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{font-family:var(--mono);font-weight:600;letter-spacing:.04em;color:var(--ink);text-decoration:none;font-size:1.05rem;}
.links{display:flex;gap:1.8rem;}
.links a{color:var(--ink-soft);text-decoration:none;font-family:var(--mono);font-size:.85rem;letter-spacing:.03em;text-transform:uppercase;}
.links a:hover{color:var(--accent);}

.hero{
  position:relative;z-index:1;
  min-height:92vh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;
  padding:6rem 1.5rem 4rem;
}
.hero-inner{max-width:920px;}
.eyebrow{
  font-family:var(--mono);text-transform:uppercase;letter-spacing:.16em;
  color:var(--accent);font-size:.82rem;margin:0 0 1.4rem;
}
.hero h1{
  font-size:clamp(4.5rem,13vw,9rem);
  margin:0;line-height:.95;font-weight:600;
  letter-spacing:-.01em;
}
.tagline{
  font-size:clamp(1.15rem,2vw,1.5rem);
  color:var(--ink-soft);max-width:720px;margin:1.8rem auto 0;font-style:italic;
}
.hl{color:var(--accent);font-style:normal;}
.hero-formula{
  margin:2.6rem auto 0;
  font-family:var(--mono);
  font-size:1.1rem;
  color:var(--ink-soft);
  overflow-x:auto;
}
.cta-row{display:flex;gap:1rem;justify-content:center;margin-top:2.6rem;flex-wrap:wrap;}
.btn{
  font-family:var(--mono);font-size:.85rem;letter-spacing:.03em;
  padding:.9rem 1.8rem;border-radius:2px;text-decoration:none;
  border:1px solid var(--ink);transition:all .2s ease;
}
.btn-primary{background:var(--ink);color:var(--bg);}
.btn-primary:hover{background:var(--accent);border-color:var(--accent);color:#fff;}
.btn-ghost{color:var(--ink);}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);}
.scroll-cue{
  position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);
  font-family:var(--mono);font-size:.75rem;color:var(--ink-soft);
  letter-spacing:.1em;
}

main{position:relative;z-index:1;}
.section{
  max-width:960px;margin:0 auto;padding:7rem 1.8rem;
  border-top:1px solid var(--line);
}
.section.alt{background:color-mix(in srgb, var(--bg-alt) 60%, transparent);}
.section h2{
  font-family:var(--mono);font-size:1rem;letter-spacing:.1em;text-transform:uppercase;
  margin:0 0 2.6rem;display:flex;align-items:baseline;gap:.9rem;color:var(--ink);
}
.num{color:var(--accent);font-weight:600;}
.lede{font-size:1.25rem;color:var(--ink-soft);max-width:70ch;}

.about-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:3rem;align-items:start;}
.facts{list-style:none;margin:0;padding:0;border-left:1px solid var(--line);}
.facts li{display:flex;justify-content:space-between;padding:.9rem 0 .9rem 1.4rem;border-bottom:1px solid var(--line);gap:1rem;}
.facts li span{font-family:var(--mono);font-size:.78rem;text-transform:uppercase;color:var(--ink-soft);letter-spacing:.05em;}
.facts li strong{font-weight:500;text-align:right;}
.facts a{color:var(--accent);}

.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:1.4rem;}
.card{
  background:var(--card);border:1px solid var(--line);padding:1.8rem;border-radius:2px;
}
.card h3{margin:0 0 .6rem;font-size:1.15rem;color:var(--accent);}
.card p{margin:0;color:var(--ink-soft);font-size:1.02rem;}

.note{font-family:var(--mono);font-size:.78rem;color:var(--ink-soft);margin-top:2.2rem;letter-spacing:.02em;}

.research-item{padding:1.8rem 0;border-bottom:1px solid var(--line);}
.research-item:first-of-type{padding-top:0;}
.research-item:last-of-type{border-bottom:none;padding-bottom:0;}
.ri-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:.6rem;margin-bottom:.7rem;}
.ri-head h3{margin:0;font-size:1.3rem;color:var(--ink);}
.ri-tag{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);}
.research-item p{margin:0 0 .7rem;color:var(--ink-soft);max-width:74ch;}
.ri-sup{font-family:var(--mono);font-size:.8rem;color:var(--ink-soft);opacity:.85;}

.skills-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;}
.skill-block{border:1px solid var(--line);background:var(--card);padding:1.3rem;border-radius:2px;}
.skill-block h4{margin:0 0 .4rem;font-family:var(--mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--accent);}
.skill-block p{margin:0;color:var(--ink-soft);font-size:.98rem;}

.pub-list{display:flex;flex-direction:column;gap:1rem;}
.pub{border:1px dashed var(--line);padding:1.4rem 1.6rem;border-radius:2px;}
.pub-meta{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;color:var(--accent);letter-spacing:.08em;margin-bottom:.4rem;}
.pub-title{font-size:1.2rem;font-weight:500;}
.pub-sub{color:var(--ink-soft);font-size:.95rem;margin-top:.3rem;}

.timeline{list-style:none;margin:0;padding:0;position:relative;}
.timeline::before{content:'';position:absolute;left:5px;top:6px;bottom:6px;width:1px;background:var(--line);}
.timeline li{position:relative;padding-left:2.2rem;margin-bottom:2.4rem;}
.tl-dot{position:absolute;left:0;top:.35rem;width:11px;height:11px;border-radius:50%;background:var(--accent);}
.tl-year{font-family:var(--mono);font-size:.78rem;color:var(--accent);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.3rem;}
.tl-body h3{margin:0 0 .3rem;font-size:1.2rem;}
.tl-body p{margin:0;color:var(--ink-soft);}

.contact-section{text-align:center;}
.contact-grid{display:flex;gap:1.2rem;justify-content:center;margin-top:2.4rem;flex-wrap:wrap;}
.contact-card{
  display:flex;flex-direction:column;align-items:center;gap:.6rem;
  padding:1.6rem 2.2rem;border:1px solid var(--line);border-radius:2px;
  text-decoration:none;color:var(--ink);background:var(--card);min-width:140px;
  transition:border-color .2s ease,transform .2s ease;
}
.contact-card:hover{border-color:var(--accent);transform:translateY(-3px);}
.ci{font-size:1.4rem;}
.contact-card span:last-child{font-family:var(--mono);font-size:.8rem;letter-spacing:.04em;}

footer{
  position:relative;z-index:1;text-align:center;padding:3rem 1.5rem;
  font-family:var(--mono);font-size:.78rem;color:var(--ink-soft);
  border-top:1px solid var(--line);
}

@media (max-width:720px){
  .about-grid{grid-template-columns:1fr;}
  .cards{grid-template-columns:1fr;}
  .skills-grid{grid-template-columns:repeat(2,1fr);}
  .topnav{padding:1rem 1.2rem;}
  .links{gap:1rem;flex-wrap:wrap;}
  .links a{font-size:.72rem;}
  body{font-size:17px;}
}