/* ============================================================
   BMI Physical AI Institute — design system
   Cyan / amber on deep navy. Instrument-panel aesthetic.
   ============================================================ */
:root{
  --bg:#0A1628; --bg2:#0C1B30; --panel:#102540; --panel2:#13294B;
  --line:#243B5C; --line-soft:#1B304E;
  --ink:#EAF1F8; --ink-dim:#93A8C6; --ink-faint:#5E7699;
  --cyan:#3ACFE6; --cyan-soft:rgba(58,207,230,.13);
  --amber:#EEAE4A; --amber-soft:rgba(238,174,74,.13);
  --good:#5FD08A;
  --font-display:'Space Grotesk',system-ui,-apple-system,sans-serif;
  --font-body:'Inter',system-ui,-apple-system,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,Menlo,monospace;
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--ink); font-family:var(--font-body);
  line-height:1.6; -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
.mono{font-family:var(--font-mono)}
::selection{background:rgba(58,207,230,.3);color:#fff}

/* scroll progress bar */
#progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--cyan),var(--amber));transition:width .1s linear}

/* faint background grid */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--line-soft) 1px,transparent 1px),
                   linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(circle at 50% 0%,#000 0%,transparent 75%);
          mask-image:radial-gradient(circle at 50% 0%,#000 0%,transparent 75%);
}
main,nav,footer{position:relative;z-index:1}

.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--cyan);display:inline-flex;gap:10px;align-items:center;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan);display:inline-block}
.eyebrow.amber{color:var(--amber)} .eyebrow.amber::before{background:var(--amber)}

h1,h2,h3{font-family:var(--font-display);font-weight:600;line-height:1.05;letter-spacing:-.01em}

/* ---------- NAV ---------- */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);
  background:rgba(10,22,40,.72);border-bottom:1px solid var(--line-soft);
  transition:background .3s,border-color .3s}
nav.scrolled{background:rgba(8,18,33,.92);border-bottom-color:var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--font-display);font-weight:600;letter-spacing:.01em}
.brand .mark{width:30px;height:30px;flex:0 0 auto}
.brand small{display:block;font-family:var(--font-mono);font-size:9.5px;letter-spacing:.22em;color:var(--ink-faint);text-transform:uppercase;font-weight:400}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{font-size:14px;color:var(--ink-dim);transition:color .2s;position:relative}
.nav-links a:not(.btn):hover{color:var(--ink)}
.nav-links a:not(.btn).active{color:var(--cyan)}
.nav-links a:not(.btn).active::after{content:"";position:absolute;left:0;right:0;bottom:-21px;height:2px;background:var(--cyan)}
.btn{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;cursor:pointer;
  padding:10px 16px;border-radius:7px;border:1px solid var(--amber);
  color:var(--bg);background:var(--amber);transition:transform .15s,box-shadow .2s;white-space:nowrap}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(238,174,74,.28)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--cyan);box-shadow:none;color:var(--cyan)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:6px;
  color:var(--ink);width:40px;height:36px;font-size:18px;cursor:pointer}

/* ---------- HERO ---------- */
.hero{padding:74px 0 60px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(40px,6vw,72px);font-weight:700;margin:22px 0 0}
.hero h1 .lit{color:var(--cyan)}
.hero p.lede{font-size:18px;color:var(--ink-dim);max-width:40ch;margin-top:22px}
.hero-cta{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.readout{display:flex;flex-wrap:wrap;gap:8px 26px;margin-top:38px;padding-top:22px;border-top:1px solid var(--line-soft)}
.readout div{font-family:var(--font-mono);font-size:12px;color:var(--ink-faint);letter-spacing:.04em}
.readout b{display:block;font-size:20px;color:var(--ink);letter-spacing:0;font-weight:500;margin-bottom:2px}
.readout b.cy{color:var(--cyan)} .readout b.am{color:var(--amber)}

/* hero twin frame (now wraps a real image + svg overlay) */
.twin{position:relative;border:1px solid var(--line);border-radius:14px;
  background:radial-gradient(120% 120% at 70% 0%,#13294B 0%,#0B1A30 60%);
  padding:0;overflow:hidden;aspect-ratio:4/3}
.twin img,.twin video{width:100%;height:100%;object-fit:cover;opacity:.96}
.twin .scrim{position:absolute;inset:0;z-index:2;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,22,40,.35) 0%,transparent 30%,rgba(10,22,40,.55) 100%)}
.twin .tag{position:absolute;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;z-index:3}
.twin .tag.l{top:16px;left:18px;color:var(--amber)}
.twin .tag.r{top:16px;right:18px;color:var(--cyan)}
.twin .tag.b{bottom:14px;left:18px;color:var(--ink);text-shadow:0 1px 6px #000}
.corner{position:absolute;width:14px;height:14px;border:1px solid var(--cyan);opacity:.6;z-index:3}
.corner.tl{top:8px;left:8px;border-right:0;border-bottom:0}
.corner.tr{top:8px;right:8px;border-left:0;border-bottom:0}
.corner.bl{bottom:8px;left:8px;border-right:0;border-top:0}
.corner.br{bottom:8px;right:8px;border-left:0;border-top:0}
@keyframes sweep{0%{transform:translateX(-46%)}50%{transform:translateX(46%)}100%{transform:translateX(-46%)}}
.twin .scan{position:absolute;top:0;bottom:0;left:50%;width:2px;z-index:3;
  background:linear-gradient(180deg,transparent,var(--cyan),transparent);opacity:.5;animation:sweep 6s ease-in-out infinite}

/* ---------- credibility strip ---------- */
.cred{border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(16,37,64,.5),transparent)}
.cred .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding-top:30px;padding-bottom:30px}
.cred .c{display:flex;flex-direction:column;gap:4px}
.cred .c b{font-family:var(--font-display);font-size:24px;font-weight:600;color:var(--ink)}
.cred .c b.cy{color:var(--cyan)} .cred .c b.am{color:var(--amber)}
.cred .c span{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:var(--ink-dim);text-transform:uppercase}

/* ---------- SECTION SHELL ---------- */
section.block{padding:78px 0;border-top:1px solid var(--line-soft)}
.sec-head{max-width:64ch}
.sec-head h2{font-size:clamp(28px,3.6vw,42px);margin:16px 0 14px}
.sec-head p{color:var(--ink-dim);font-size:16.5px}

/* reveal */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.08s}
.reveal[data-d="2"]{transition-delay:.16s}
.reveal[data-d="3"]{transition-delay:.24s}

/* card grids */
.grid{display:grid;gap:18px;margin-top:40px}
.g4{grid-template-columns:repeat(4,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--panel);border:1px solid var(--line-soft);border-radius:12px;padding:22px;
  transition:border-color .25s,transform .25s,box-shadow .25s;will-change:transform}
.card:hover{border-color:var(--line);transform:translateY(-3px);box-shadow:0 14px 40px rgba(0,0,0,.32)}
.card .kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan);text-transform:uppercase}
.card h3{font-size:19px;margin:14px 0 8px}
.card p{font-size:14.5px;color:var(--ink-dim)}
.card .ic{width:34px;height:34px;color:var(--amber)}

/* ---------- four pillars ---------- */
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:40px}
.pillar{position:relative;background:var(--panel);border:1px solid var(--line-soft);border-radius:12px;
  padding:24px 22px;overflow:hidden;transition:transform .25s,border-color .25s}
.pillar:hover{transform:translateY(-3px);border-color:var(--line)}
.pillar .num{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--ink-faint)}
.pillar .ic{width:38px;height:38px;margin:14px 0 14px;color:var(--cyan)}
.pillar:nth-child(4) .ic{color:var(--amber)}
.pillar h3{font-size:18px;margin-bottom:8px}
.pillar p{font-size:14px;color:var(--ink-dim)}
.pillar.spot{background:linear-gradient(180deg,var(--amber-soft),transparent),var(--panel);border-color:rgba(238,174,74,.4)}
.pillar.spot::after{content:"OUR PRODUCT";position:absolute;top:14px;right:14px;font-family:var(--font-mono);
  font-size:9px;letter-spacing:.12em;color:var(--amber);border:1px solid rgba(238,174,74,.4);border-radius:4px;padding:2px 6px}

/* ---------- media (real images) ---------- */
.photo{position:relative;border-radius:11px;overflow:hidden;border:1px solid var(--line-soft);
  background:linear-gradient(135deg,#16304F 0%,#0E2138 60%);aspect-ratio:16/10}
.photo img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.card:hover .photo img,.tile:hover .photo img{transform:scale(1.05)}
.photo::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 40%,rgba(10,22,40,.55) 100%)}
.photo .imgtag{position:absolute;top:10px;right:11px;font-family:var(--font-mono);font-size:9.5px;z-index:2;
  letter-spacing:.12em;color:var(--cyan);border:1px solid rgba(58,207,230,.45);border-radius:4px;padding:2px 6px;background:rgba(10,22,40,.5)}
.photo .cap{position:absolute;bottom:10px;left:12px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;color:var(--ink);z-index:2;text-shadow:0 1px 6px #000}

/* equipment card */
.equip .photo{aspect-ratio:16/11}
.equip h3{margin:16px 0 6px;font-size:18px}
.equip p{font-size:14px;color:var(--ink-dim);min-height:42px}
.specs{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}
.chip{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.03em;color:var(--ink-dim);
  border:1px solid var(--line);border-radius:5px;padding:3px 8px}

/* scenario tiles */
.tile{cursor:default}
.tile .photo{aspect-ratio:16/10}

/* video placeholder -> now uses a poster image */
.video{position:relative;border-radius:12px;overflow:hidden;border:1px solid var(--line);
  aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;cursor:pointer;
  background:radial-gradient(130% 120% at 30% 20%,#17324F 0%,#0A1A30 65%)}
.video img,.video video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55;transition:opacity .4s var(--ease)}
.video.playing video{opacity:.82}
.video::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 50%,transparent,rgba(10,22,40,.4))}
.play{position:relative;z-index:2;width:66px;height:66px;border-radius:50%;
  border:1.5px solid var(--cyan);display:flex;align-items:center;justify-content:center;background:rgba(10,26,48,.55);transition:transform .2s,background .2s}
.video:hover .play{transform:scale(1.07);background:rgba(58,207,230,.22)}
.play span{display:block;width:0;height:0;border-left:18px solid var(--cyan);border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:5px}
.video .vtag{position:absolute;top:12px;left:13px;font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--amber);z-index:2;text-shadow:0 1px 6px #000}
.video .dur{position:absolute;bottom:12px;right:13px;font-family:var(--font-mono);font-size:11px;color:var(--ink);background:rgba(10,22,40,.7);padding:3px 8px;border-radius:5px;z-index:2}

/* twin studio split */
.studio{display:grid;grid-template-columns:1.1fr 1fr;gap:24px;margin-top:42px;align-items:stretch}
.splitviz{position:relative;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#0B1A30;min-height:300px}
.splitviz img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.splitviz .scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,22,40,.4),transparent 40%,rgba(10,22,40,.5))}
.splitlabel{position:absolute;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;z-index:3;text-shadow:0 1px 6px #000}

/* diagrams */
.diagram{margin-top:42px;border:1px solid var(--line-soft);border-radius:14px;background:var(--panel);padding:30px 24px;overflow-x:auto}
.diagram svg{display:block;width:100%;min-width:560px;height:auto}
.pathway{margin-top:42px;border:1px solid var(--line-soft);border-radius:14px;background:linear-gradient(180deg,#102540,#0D1F38);padding:34px 24px;overflow-x:auto}
.pathway svg{display:block;width:100%;min-width:640px;height:auto}

/* ---------- why now / funding ---------- */
.fundtable{margin-top:40px;border:1px solid var(--line-soft);border-radius:14px;overflow:hidden;background:var(--panel)}
.fundrow{display:grid;grid-template-columns:1.1fr 1.6fr .9fr;gap:18px;padding:18px 22px;
  border-bottom:1px solid var(--line-soft);align-items:center;transition:background .2s}
.fundrow:last-child{border-bottom:0}
.fundrow:hover{background:var(--panel2)}
.fundrow.head{background:transparent;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--ink-faint)}
.fundrow .src{font-family:var(--font-display);font-weight:600;color:var(--ink);font-size:15px}
.fundrow .what{font-size:14px;color:var(--ink-dim)}
.fundrow .scale{font-family:var(--font-mono);font-size:14px;color:var(--amber);text-align:right;font-weight:500}
.fundnote{margin-top:18px;font-size:14px;color:var(--ink-dim)}
.fundnote b{color:var(--cyan);font-weight:600}

/* benchmarks */
.bench{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:38px}
.bench .card{padding:20px}
.bench .src{font-family:var(--font-mono);font-size:10.5px;color:var(--amber);letter-spacing:.08em}
.bench h3{font-size:16px;margin:9px 0 7px}
.bench p{font-size:13.5px;color:var(--ink-dim)}

/* ---------- CTA + form ---------- */
.ctaband{margin:84px 0 0;border-top:1px solid var(--line-soft);
  background:radial-gradient(80% 140% at 50% 0%,rgba(58,207,230,.07),transparent 60%)}
.ctaband .wrap{padding-top:70px;padding-bottom:30px;text-align:center}
.ctaband h2{font-size:clamp(28px,4vw,46px);max-width:20ch;margin:14px auto 18px}
.ctaband p{color:var(--ink-dim);max-width:54ch;margin:0 auto 30px}

.formwrap{max-width:680px;margin:10px auto 80px;border:1px solid var(--line);border-radius:16px;
  background:var(--panel);padding:34px;text-align:left;position:relative;overflow:hidden}
.formwrap::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--cyan),var(--amber))}
.formgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:7px}
.field.full{grid-column:1 / -1}
.field label{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-dim)}
.field label .req{color:var(--amber)}
.field input,.field select,.field textarea{
  font-family:var(--font-body);font-size:15px;color:var(--ink);background:var(--bg2);
  border:1px solid var(--line);border-radius:8px;padding:11px 13px;transition:border-color .2s,box-shadow .2s}
.field textarea{resize:vertical;min-height:96px}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px var(--cyan-soft)}
.field.err input,.field.err select,.field.err textarea{border-color:#E5616B;box-shadow:0 0 0 3px rgba(229,97,107,.15)}
.field .msg{font-size:12px;color:#E5616B;min-height:14px}
.form-actions{display:flex;align-items:center;gap:16px;margin-top:22px;flex-wrap:wrap}
.form-actions .btn{font-size:13.5px;padding:12px 22px}
.form-note{font-family:var(--font-mono);font-size:11px;color:var(--ink-faint);letter-spacing:.03em}
.form-success{display:none;text-align:center;padding:22px 10px}
.form-success.show{display:block;animation:fadein .5s var(--ease)}
.form-success .ck{width:56px;height:56px;border-radius:50%;border:1.5px solid var(--good);
  display:flex;align-items:center;justify-content:center;margin:0 auto 16px;color:var(--good);font-size:26px}
.form-success h3{font-size:22px;margin-bottom:8px}
.form-success p{color:var(--ink-dim);max-width:42ch;margin:0 auto}
@keyframes fadein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- lightbox ---------- */
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(6,13,24,.86);backdrop-filter:blur(6px);
  display:none;align-items:center;justify-content:center;padding:30px;opacity:0;transition:opacity .25s}
.lightbox.open{display:flex;opacity:1}
.lightbox .box{position:relative;max-width:880px;width:100%;border:1px solid var(--line);border-radius:14px;
  overflow:hidden;background:var(--panel);transform:translateY(12px);transition:transform .3s var(--ease)}
.lightbox.open .box{transform:none}
.lightbox .box img,.lightbox .box video{width:100%;aspect-ratio:16/9;object-fit:cover;background:#0A1628;display:block}
.lightbox .box video{outline:none}
.lightbox .lbcap{padding:18px 22px}
.lightbox .lbcap h3{font-size:20px;margin-bottom:6px}
.lightbox .lbcap p{color:var(--ink-dim);font-size:14.5px}
.lightbox .lbcap .mono{display:block;margin-top:10px;color:var(--ink-faint);font-size:11px;letter-spacing:.04em}
.lightbox .close{position:absolute;top:12px;right:12px;z-index:3;width:38px;height:38px;border-radius:8px;
  border:1px solid var(--line);background:rgba(10,22,40,.7);color:var(--ink);font-size:20px;cursor:pointer;line-height:1}
.lightbox .close:hover{border-color:var(--cyan);color:var(--cyan)}

/* footer */
footer{border-top:1px solid var(--line-soft);padding:46px 0 60px}
.foot-grid{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:flex-start}
.foot-links{display:flex;gap:34px;flex-wrap:wrap}
.foot-col h4{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--ink-faint);text-transform:uppercase;margin-bottom:12px;font-weight:500}
.foot-col a{display:block;font-size:14px;color:var(--ink-dim);margin-bottom:8px;transition:color .2s}
.foot-col a:hover{color:var(--cyan)}
.mocknote{margin-top:36px;padding-top:22px;border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:11.5px;color:var(--ink-faint);letter-spacing:.03em}

/* responsive */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .studio{grid-template-columns:1fr}
  .g4{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  .bench{grid-template-columns:repeat(2,1fr)}
  .pillars{grid-template-columns:repeat(2,1fr)}
  .cred .wrap{grid-template-columns:repeat(2,1fr);gap:20px}
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:64px;left:0;right:0;flex-direction:column;
    background:var(--bg2);border-bottom:1px solid var(--line);padding:18px 28px;gap:16px}
  .nav-links.open a:not(.btn).active::after{display:none}
  .nav-toggle{display:block}
  .fundrow{grid-template-columns:1fr;gap:6px}
  .fundrow.head{display:none}
  .fundrow .scale{text-align:left}
}
@media(max-width:560px){
  .g3,.g2,.g4,.pillars{grid-template-columns:1fr}
  .wrap{padding:0 20px}
  .hero{padding:48px 0 40px}
  .formgrid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important}
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  .photo img,.twin .scan{transition:none}
}