/* Armchair Technologies — styles. No build step. */
:root{
  --navy-950:#071226; --navy-900:#0b1a33; --navy-800:#12264a; --navy-700:#1c3563;
  --slate-700:#3c4a60; --slate-600:#4f5d74; --slate-300:#c3ccd9; --slate-100:#eef1f6;
  --paper:#f8f6f1; --white:#fff;
  --gold:#e0a84a; --gold-deep:#9a6414; --sky:#8fb3d9;
  --serif:"Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --radius:14px; --shadow:0 10px 30px rgba(11,26,51,.08);
  --wrap:1160px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;font-family:var(--sans);font-size:1.0625rem;line-height:1.65;color:var(--slate-700);background:var(--white);}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy-700);text-underline-offset:3px}
a:hover{color:var(--gold-deep)}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px;border-radius:4px}
h1,h2,h3{font-family:var(--serif);color:var(--navy-900);line-height:1.15;margin:0 0 .6em;font-weight:600}
h2{font-size:clamp(1.9rem,3.2vw,2.6rem);letter-spacing:-.01em}
h3{font-size:1.25rem}
p{margin:0 0 1em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:8px;background:var(--gold);color:var(--navy-950);padding:8px 14px;border-radius:8px;z-index:100;font-weight:600}
.skip:focus{left:12px}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--gold-deep);margin-bottom:14px}
.lede{font-size:1.15rem;color:var(--slate-600);max-width:62ch}
.section{padding:96px 0}
.section-head{max-width:760px;margin-bottom:48px}
.alt{background:var(--paper)}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--slate-100)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand img{height:52px;width:auto}
.nav-links{display:flex;gap:26px;align-items:center;list-style:none;margin:0;padding:0}
.nav-links a{text-decoration:none;color:var(--navy-900);font-weight:500;font-size:.95rem}
.nav-links a:hover{color:var(--gold-deep)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:999px;font-weight:600;text-decoration:none;font-size:.98rem;border:2px solid transparent;transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn-gold{background:var(--gold);color:var(--navy-950)}
.btn-gold:hover{background:#ebb75e;color:var(--navy-950)}
.btn-ghost{border-color:rgba(255,255,255,.45);color:#fff}
.btn-ghost:hover{border-color:#fff;color:#fff}
.btn-navy{background:var(--navy-900);color:#fff}
.btn-navy:hover{background:var(--navy-700);color:#fff}
.nav .btn{padding:9px 18px;font-size:.9rem}
.menu-toggle{display:none;background:none;border:1px solid var(--slate-300);border-radius:10px;padding:8px 12px;font:inherit;font-weight:600;color:var(--navy-900);cursor:pointer}

/* Hero */
.hero{background:radial-gradient(1200px 500px at 85% -10%,rgba(224,168,74,.18),transparent 60%),linear-gradient(160deg,var(--navy-950),var(--navy-800));color:#dfe6f1;padding:88px 0 72px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:56px;align-items:center}
.hero .eyebrow{color:var(--gold)}
.hero h1{color:#fff;font-size:clamp(2.5rem,5.4vw,4.1rem);letter-spacing:-.02em;margin-bottom:.25em}
.hero .theme2{font-family:var(--serif);font-style:italic;font-size:clamp(1.35rem,2.4vw,1.8rem);color:var(--gold);margin:0 0 24px}
.hero .lede{color:#c9d3e2}
.hero-ctas{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.open-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:28px}
.open-card h2{color:#fff;font-size:1.3rem;margin-bottom:14px}
.open-card ul{list-style:none;margin:0;padding:0}
.open-card li{display:flex;gap:12px;padding:12px 0;border-top:1px solid rgba(255,255,255,.1);color:#dfe6f1;font-size:.98rem}
.open-card li:first-child{border-top:0}
.open-card strong{color:#fff;display:block}
.dot{flex:none;width:10px;height:10px;border-radius:50%;background:var(--gold);margin-top:8px}
.stats{list-style:none;padding-left:0;margin-bottom:0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:64px;padding-top:36px;border-top:1px solid rgba(255,255,255,.12)}
.stat b{display:block;font-family:var(--serif);font-size:2.1rem;color:#fff;line-height:1.1}
.stat span{font-size:.9rem;color:#aebbd0}

/* Values */
.themes{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.theme{background:var(--white);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow);border-top:4px solid var(--gold)}
.theme h3{font-size:1.65rem}
.values{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.value{padding:22px 24px;border-radius:var(--radius);background:var(--white);border:1px solid #e7e2d8}
.value h3{font-size:1.08rem;margin-bottom:.35em}
.value p{margin:0;font-size:.97rem}

/* Engagement models */
.models{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:48px}
.model{padding:22px;border-radius:var(--radius);border:1px solid var(--slate-100);background:var(--slate-100)}
.model.featured{background:var(--navy-900);border-color:var(--navy-900);color:#d4dceb}
.model.featured h3{color:#fff}
.model h3{font-size:1.1rem;margin-bottom:.35em}
.model p{margin:0;font-size:.95rem}

/* Services */
.services{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.service{padding:30px;border-radius:var(--radius);border:1px solid #e3e8f0;background:#fff;display:flex;flex-direction:column}
.service .num{font-family:var(--serif);color:var(--gold-deep);font-size:1rem;font-weight:600;margin-bottom:8px}
.service ul{margin:.2em 0 0;padding-left:1.1em;font-size:.96rem}
.service li{margin-bottom:.35em}
.service.cta-card{background:var(--paper);border-color:#e7e2d8;justify-content:center}

/* Experience */
.logos{display:flex;flex-wrap:wrap;gap:10px 12px;margin:-16px 0 40px;padding:0;list-style:none}
.logos li{font-size:.88rem;font-weight:600;color:var(--navy-800);background:#fff;border:1px solid #e3e8f0;padding:6px 14px;border-radius:999px}
.timeline{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.role{background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.role .meta{font-size:.85rem;color:var(--slate-600);font-weight:600;letter-spacing:.02em;margin-bottom:4px}
.role h3{margin-bottom:.2em}
.role .title{font-size:.95rem;color:var(--gold-deep);font-weight:600;margin-bottom:12px}
.role ul{margin:0;padding-left:1.1em;font-size:.97rem}
.role li{margin-bottom:.4em}
.role.wide{grid-column:1/-1;border-left:4px solid var(--gold)}
.kw{margin-top:40px;font-size:.92rem;color:var(--slate-600)}

/* About */
.about-grid{display:grid;grid-template-columns:300px 1fr;gap:56px;align-items:start}
.chips{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:8px 0 24px}
.chips li{background:var(--navy-900);color:#fff;font-size:.85rem;font-weight:600;padding:6px 14px;border-radius:999px}
.edu{font-size:.96rem}

/* Ventures */
.venture{display:grid;grid-template-columns:160px 1fr;gap:32px;align-items:center;background:#fff;border:1px solid #e7e2d8;border-radius:var(--radius);padding:28px 32px;max-width:860px}
.venture img{width:160px;border-radius:10px}
.venture h3{margin-bottom:.3em}
.more{margin-top:18px;font-size:.92rem;color:var(--slate-600);font-style:italic}

/* Contact */
.contact{background:linear-gradient(160deg,var(--navy-900),var(--navy-800));color:#d4dceb;text-align:center}
.contact h2{color:#fff}
.contact .lede{margin:0 auto 32px;color:#c9d3e2}
.contact-ctas{display:flex;justify-content:center;flex-wrap:wrap;gap:14px}
.contact .loc{margin-top:26px;font-size:.95rem;color:#aebbd0}

footer{background:var(--navy-950);color:#8c9ab1;font-size:.88rem;padding:28px 0}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between}
footer a{color:#c9d3e2}

/* Responsive */
@media (max-width:1000px){
  .hero-grid,.about-grid{grid-template-columns:1fr}
  .services{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  .menu-toggle{display:inline-block}
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 18px;border-bottom:1px solid var(--slate-100);box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .nav-links li a{display:block;padding:12px 0}
  .nav-links .btn{justify-content:center;margin-top:8px}
}
@media (max-width:700px){
  .section{padding:64px 0}
  .hero{padding:56px 0 48px}
  .themes,.values,.services,.timeline,.models{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr;margin-top:44px}
  .venture{grid-template-columns:1fr;text-align:left}
  .venture img{width:120px}
  .theme{padding:28px}
  .brand img{height:36px}
}
.nav-links a.btn,.nav-links a.btn:hover{color:#fff}
@media (max-width:820px){.nav-links li a.btn{display:flex;justify-content:center;padding:12px 18px}}
@media (max-width:700px){.hero .lede{font-size:1.05rem}}
/* Brand photos (Oct 21 update) */
.open-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.open-head h2{margin:0}
.avatar{width:64px;height:64px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.7);flex:none}
.headshot-photo img{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:18px;box-shadow:var(--shadow)}
.about-grid .headshot-photo{max-width:300px}
.photo-band{position:relative;background:var(--navy-950);overflow:hidden}
.photo-band img{width:100%;height:clamp(300px,34vw,520px);object-fit:cover;object-position:42% 35%}
.photo-band-text{position:absolute;inset:0;display:flex;align-items:center;background:linear-gradient(90deg,rgba(7,18,38,.15) 0%,rgba(7,18,38,.1) 45%,rgba(7,18,38,.82) 68%,rgba(7,18,38,.94) 100%)}
.photo-band-text .wrap{width:100%}
.photo-band-copy{margin-left:auto;max-width:380px}
.photo-band-copy .eyebrow{color:var(--gold)}
.photo-band-copy p{font-family:var(--serif);font-size:clamp(1.5rem,2.6vw,2.2rem);line-height:1.2;color:#fff;margin:0}
.footer-logo{height:36px;width:auto}
footer .wrap{align-items:center}
@media (max-width:1000px){.about-grid .headshot-photo{max-width:260px}}
@media (max-width:700px){
  .photo-band img{height:340px;object-position:40% 40%}
  .photo-band-text{align-items:flex-end;background:linear-gradient(180deg,rgba(7,18,38,0) 35%,rgba(7,18,38,.9) 85%)}
  .photo-band-copy{margin-left:0;padding-bottom:26px}
}
/* Credential card (MIT xPRO) */
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.credential{display:grid;grid-template-columns:150px 1fr;gap:20px;align-items:center;max-width:560px;margin:4px 0 18px;padding:16px;border:1px solid #e3e8f0;border-radius:var(--radius);background:#fff;box-shadow:var(--shadow)}
.credential-thumb img{width:150px;height:auto;border-radius:6px;border:1px solid #e3e8f0;transition:transform .15s}
.credential-thumb:hover img{transform:scale(1.03)}
.credential-label{display:block;font-size:.72rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--gold-deep);margin-bottom:4px}
.credential-body h3{font-size:1.05rem;line-height:1.3;margin:0 0 4px}
.credential-meta{font-size:.9rem;color:var(--slate-600);margin:0 0 6px}
.credential-verify{font-size:.92rem;font-weight:600}
@media (max-width:480px){.credential{grid-template-columns:1fr}.credential-thumb img{width:100%}}