:root{
  --bg:#0A1628;
  --bg-2:#0D1B31;
  --surface:#11213C;
  --line:rgba(198,167,94,0.18);
  --text:#EDE9DF;
  --muted:#9AA7BC;
  --gold:#C6A75E;
  --gold-2:#E0C385;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:'Archivo',sans-serif;
  font-weight:300;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--gold);color:var(--bg)}

h1,h2,h3,.stat-num,.footer-logo{
  font-family:'Fraunces',serif;
  font-weight:400;
  letter-spacing:-0.01em;
}

/* ---------- NAV ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  height:64px;padding:0 32px;
  background:rgba(10,22,40,0.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .3s;
}
.nav.scrolled{border-bottom-color:var(--line)}
.nav-logo{
  display:flex;align-items:center;gap:10px;
  color:var(--text);text-decoration:none;
  font-family:'Archivo Expanded','Archivo',sans-serif;
  font-weight:600;font-size:15px;letter-spacing:.22em;
}
.nav-links{display:flex;gap:28px}
.nav-links a{
  color:var(--muted);text-decoration:none;font-size:13.5px;
  letter-spacing:.06em;transition:color .2s;
}
.nav-links a:hover{color:var(--gold-2)}
.nav-cta{
  color:var(--bg);background:var(--gold);
  text-decoration:none;font-size:13px;font-weight:500;
  padding:9px 20px;border-radius:999px;
  transition:background .2s, transform .15s;
}
.nav-cta:hover{background:var(--gold-2)}
.nav-cta:active{transform:scale(.97)}

/* ---------- HERO ---------- */
.hero{
  position:relative;
  min-height:100dvh;
  display:flex;align-items:center;
  overflow:hidden;
}
.hero-inner{
  position:relative;z-index:2;
  max-width:1200px;margin:0 auto;
  padding:120px 32px 64px;
}
.hero-headline{
  font-family:'Fraunces',serif;
  font-size:clamp(52px,9.5vw,124px);
  line-height:1.02;
  letter-spacing:-0.015em;
}
.hero-headline .line{display:block;overflow:hidden;padding-bottom:.08em}
.hero-headline .word{display:inline-block}
.hero.armed .hero-headline .word{
  transform:translateY(110%);
  transition:transform 1s cubic-bezier(.16,1,.3,1);
}
.hero.armed.on .hero-headline .word{transform:translateY(0)}
.hero-headline .line:nth-child(1) .word{transition-delay:.05s}
.hero-headline .line:nth-child(2) .word:nth-child(1){transition-delay:.14s}
.hero-headline .line:nth-child(2) .word:nth-child(2){transition-delay:.2s}
.hero-headline .line:nth-child(3) .word:nth-child(1){transition-delay:.26s}
.hero-headline .line:nth-child(3) .word:nth-child(2){transition-delay:.32s}
.hero-headline .line:nth-child(4) .word{transition-delay:.4s}
.hero-headline .italic{font-style:italic;color:var(--gold-2)}
.hero-sub{
  max-width:56ch;margin-top:28px;
  color:var(--muted);font-size:17px;
}
.hero.armed .hero-sub{
  opacity:0;transform:translateY(16px);
  transition:opacity .8s .7s,transform .8s .7s;
}
.hero.armed.on .hero-sub{opacity:1;transform:none}
.hero-ctas{
  display:flex;gap:14px;margin-top:36px;
}
.hero.armed .hero-ctas{
  opacity:0;transform:translateY(16px);
  transition:opacity .8s .85s,transform .8s .85s;
}
.hero.armed.on .hero-ctas{opacity:1;transform:none}
.hero-mark{
  position:absolute;right:-6vw;top:50%;
  transform:translateY(-50%);
  width:min(52vw,640px);z-index:1;pointer-events:none;
}
.mark-svg{width:100%;height:auto;animation:spin 90s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){
  .mark-svg{animation:none}
  .hero-headline .word{transition:none;transform:none}
  .hero-sub,.hero-ctas{transition:none;opacity:1;transform:none}
}

/* ---------- BUTTONS ---------- */
.btn{
  display:inline-block;text-decoration:none;
  font-size:14px;font-weight:500;letter-spacing:.04em;
  padding:14px 30px;border-radius:999px;
  transition:background .25s,color .25s,border-color .25s,transform .15s;
}
.btn:active{transform:scale(.97)}
.btn-gold{background:var(--gold);color:#0A1628}
.btn-gold:hover{background:var(--gold-2)}
.btn-ghost{border:1px solid var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-2)}

/* ---------- STATS ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  max-width:1200px;margin:0 auto;
}
.stat{padding:44px 32px;border-left:1px solid var(--line)}
.stat:first-child{border-left:none}
.stat-num{
  font-size:clamp(34px,3.4vw,52px);
  color:var(--gold-2);
  font-variant-numeric:tabular-nums;
}
.stat-label{margin-top:8px;color:var(--muted);font-size:13px;letter-spacing:.04em}

/* ---------- SECTIONS ---------- */
section{max-width:1200px;margin:0 auto;padding:110px 32px}
.section-eyebrow{
  font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--gold);margin-bottom:22px;font-weight:500;
}
.section-head h2{
  font-size:clamp(34px,4.5vw,58px);line-height:1.08;
  max-width:16ch;
}

/* letter */
.letter-head{font-size:clamp(34px,4.5vw,58px);margin-bottom:30px}
.letter-body{
  max-width:62ch;color:var(--muted);
  font-size:clamp(16px,1.5vw,19px);
  margin-bottom:22px;
}
.letter-body strong{color:var(--text)}

/* engines */
.engine-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:24px;
  margin-top:56px;
}
.engine-card{
  position:relative;overflow:hidden;
  background:var(--bg-2);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:44px 40px;
  transition:border-color .3s,transform .3s;
}
.engine-card:hover{border-color:rgba(198,167,94,.45);transform:translateY(-3px)}
.engine-tag{
  font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--gold);font-weight:500;margin-bottom:18px;
}
.engine-card h3{font-size:clamp(26px,2.6vw,36px);margin-bottom:14px}
.engine-card p{color:var(--muted);font-size:15.5px;max-width:44ch}
.engine-list{list-style:none;margin-top:26px}
.engine-list li{
  padding:12px 0;color:var(--text);font-size:14.5px;
  border-top:1px solid var(--line);
}
.engine-list li::before{
  content:"";display:inline-block;width:6px;height:6px;
  background:var(--gold);border-radius:50%;
  margin-right:12px;vertical-align:1px;
}

/* spotlight effect */
.spotlight{position:relative}
.spotlight::before{
  content:"";position:absolute;inset:0;border-radius:inherit;
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(198,167,94,.10),transparent 65%);
  opacity:0;transition:opacity .35s;pointer-events:none;
}
.spotlight:hover::before{opacity:1}

/* compute */
.compute{
  display:grid;grid-template-columns:1.1fr 1fr;
  gap:56px;align-items:center;
}
.compute-visual{
  position:relative;
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--bg-2);
  min-height:380px;overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.grid-lines{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(198,167,94,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(198,167,94,.07) 1px,transparent 1px);
  background-size:44px 44px;
}
.compute-num{
  position:relative;
  font-family:'Fraunces',serif;
  font-size:clamp(72px,9vw,130px);
  color:var(--gold-2);line-height:1;
}
.compute-num span{font-size:.35em;color:var(--muted);font-family:'Archivo',sans-serif;letter-spacing:.1em}
.compute-copy h2{font-size:clamp(30px,3.6vw,46px);margin-bottom:20px;line-height:1.12}
.compute-copy p{color:var(--muted);margin-bottom:30px;max-width:48ch}

/* research */
.research-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:24px;margin-top:56px;
}
.research-card{
  display:block;text-decoration:none;color:var(--text);
  background:var(--bg-2);border:1px solid var(--line);
  border-radius:var(--radius);padding:36px 32px;
  transition:border-color .3s,transform .3s;
}
.research-card:hover{border-color:rgba(198,167,94,.45);transform:translateY(-3px)}
.research-kind{
  font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold);font-weight:500;margin-bottom:16px;
}
.research-card h3{font-size:23px;margin-bottom:12px;line-height:1.2}
.research-card p{color:var(--muted);font-size:14.5px;margin-bottom:24px}
.research-more{
  font-size:13px;color:var(--gold-2);letter-spacing:.05em;
  border-bottom:1px solid var(--line);padding-bottom:2px;
  transition:border-color .2s;
}
.research-card:hover .research-more{border-color:var(--gold)}

/* cta band */
.cta-band{
  text-align:center;
  border-top:1px solid var(--line);
}
.cta-band h2{
  font-size:clamp(40px,6vw,76px);line-height:1.05;
  margin-bottom:40px;
}

/* footer */
.footer{
  border-top:1px solid var(--line);
  max-width:1200px;margin:0 auto;
  padding:70px 32px 40px;
}
.footer-top{
  display:flex;justify-content:space-between;gap:48px;
  flex-wrap:wrap;margin-bottom:56px;
}
.footer-logo{
  font-family:'Archivo Expanded','Archivo',sans-serif;
  font-weight:600;letter-spacing:.22em;font-size:18px;color:var(--text);
}
.footer-brand p{color:var(--muted);font-size:14px;margin-top:10px}
.footer-cols{display:flex;gap:64px}
.footer-h{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);margin-bottom:14px;font-weight:500}
.footer-col a{
  display:block;color:var(--muted);text-decoration:none;
  font-size:14px;padding:5px 0;transition:color .2s;
}
.footer-col a:hover{color:var(--gold-2)}
.footer-base{color:var(--muted);font-size:12.5px;border-top:1px solid var(--line);padding-top:28px}

/* reveal on scroll: hidden state only once JS arms it */
body.armed .reveal{
  opacity:0;transform:translateY(28px);
  transition:opacity .8s cubic-bezier(.16,1,.3,1),transform .8s cubic-bezier(.16,1,.3,1);
}
body.armed .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  body.armed .reveal{transition:none;opacity:1;transform:none}
}

/* ---------- RESPONSIVE ---------- */
@media (max-width:900px){
  .stats{grid-template-columns:1fr 1fr}
  .stat:nth-child(3){border-left:none}
  .stat{border-top:1px solid var(--line)}
  .stat:nth-child(-n+2){border-top:none}
  .engine-grid,.research-grid{grid-template-columns:1fr}
  .compute{grid-template-columns:1fr}
  .nav-links{display:none}
  section{padding:80px 24px}
  .hero-inner{padding:110px 24px 56px}
  .hero-mark{opacity:.4}
}