/* AI PhD Group — premium executive design system */
:root{
  --navy:#0b1e3b; --navy-deep:#071528; --indigo:#17335f; --indigo-soft:#1e3d6e;
  --gold:#c9a15a; --gold-light:#e2c78d; --gold-deep:#a9823d;
  --ink:#0f1b2d; --body:#33455c; --muted:#6b7c93; --line:#e5eaf1; --line-soft:#eef2f7;
  --bg:#ffffff; --bg-alt:#f5f8fc; --bg-cream:#faf7f0; --white:#fff;
  --radius:14px; --radius-lg:22px; --radius-sm:9px;
  --shadow-sm:0 1px 2px rgba(11,30,59,.06),0 2px 8px rgba(11,30,59,.05);
  --shadow:0 10px 30px rgba(11,30,59,.10);
  --shadow-lg:0 24px 60px rgba(11,30,59,.16);
  --container:1180px;
  --serif:"Fraunces",Georgia,"Times New Roman",serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box}
html,body{overflow-x:clip;max-width:100%}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
h1,h2,h3,h4,p,li,a{overflow-wrap:break-word}
body{margin:0;font-family:var(--sans);color:var(--body);background:var(--bg);
  font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{color:var(--indigo);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--gold-deep)}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);line-height:1.12;
  font-weight:500;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:clamp(2.3rem,4.6vw,3.7rem);font-weight:400}
h2{font-size:clamp(1.9rem,3.4vw,2.7rem);font-weight:400}
h3{font-size:1.35rem}
p{margin:0 0 1.1em}
.container{max-width:var(--container);margin:0 auto;padding:0 28px}
.eyebrow{font-family:var(--sans);text-transform:uppercase;letter-spacing:.18em;
  font-size:.76rem;font-weight:700;color:var(--gold-deep);margin-bottom:1rem;display:block}
.section{padding:96px 0}
.section--tight{padding:70px 0}
.section--alt{background:var(--bg-alt)}
.section--cream{background:var(--bg-cream)}
.section--navy{background:var(--navy);color:#cdd8e8}
.section--navy h1,.section--navy h2,.section--navy h3{color:#fff}
.lead{font-size:1.2rem;color:var(--body);max-width:60ch}
.center{text-align:center}
.mx-auto{margin-left:auto;margin-right:auto}
.maxw{max-width:62ch}
.center .maxw,.center.maxw{margin-left:auto;margin-right:auto}
.muted{color:var(--muted)}
.small{font-size:.9rem}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.55em;font-family:var(--sans);
  font-weight:600;font-size:.98rem;padding:.92em 1.7em;border-radius:999px;
  cursor:pointer;border:1.5px solid transparent;transition:all .22s var(--ease);
  letter-spacing:.01em;white-space:nowrap}
.btn svg{width:1em;height:1em}
.btn--gold{background:var(--gold);color:var(--navy-deep);box-shadow:0 6px 18px rgba(201,161,90,.28)}
.btn--gold:hover{background:var(--gold-light);color:var(--navy-deep);transform:translateY(-2px);
  box-shadow:0 12px 26px rgba(201,161,90,.36)}
.btn--navy{background:var(--navy);color:#fff}
.btn--navy:hover{background:var(--indigo);color:#fff;transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--navy);color:var(--navy)}
.btn--light{background:#fff;color:var(--navy);border-color:transparent}
.btn--light:hover{transform:translateY(-2px);color:var(--navy)}
.btn--outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.btn--outline-light:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.06)}
.btn--lg{padding:1.05em 2em;font-size:1.05rem}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line-soft);
  transition:box-shadow .3s}
.site-header.scrolled{box-shadow:0 2px 20px rgba(11,30,59,.07)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--serif);
  font-weight:500;font-size:1.28rem;color:var(--ink);letter-spacing:-.01em}
.brand:hover{color:var(--ink)}
.brand .logo{width:38px;height:38px;flex:none}
.brand b{color:var(--gold-deep);font-weight:500}
.nav-links{display:flex;align-items:center;gap:6px;list-style:none;margin:0;padding:0}
.nav-links a{color:var(--body);font-weight:500;font-size:.95rem;padding:.55em .82em;
  border-radius:8px;font-family:var(--sans)}
.nav-links a:hover{color:var(--navy);background:var(--bg-alt)}
.nav-links a.active{color:var(--navy)}
.nav-cta{display:flex;align-items:center;gap:16px}
.nav-cta a.small{white-space:nowrap}
@media(max-width:1040px){.nav-cta a.small{display:none}}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;color:var(--navy)}
.nav-toggle svg{width:26px;height:26px}

/* hero */
.hero{position:relative;background:var(--navy);color:#d3deee;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.6}
.hero-bg::after{content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,var(--navy) 34%,rgba(11,30,59,.72) 56%,rgba(11,30,59,.22) 100%)}
.hero-inner{position:relative;z-index:2;padding:104px 0 96px;max-width:640px}
.hero h1{color:#fff;margin-bottom:.4em}
.hero .sub{font-size:1.2rem;color:#c3d1e6;margin-bottom:1.9em;max-width:54ch}
.hero .eyebrow{color:var(--gold-light)}
.hero .btn-row{margin-bottom:0}
.trust-line{margin-top:2.4em;padding-top:1.6em;border-top:1px solid rgba(255,255,255,.14);
  font-size:.92rem;color:#9fb2cd;max-width:52ch}

/* stat band */
.statband{background:var(--navy-deep);color:#fff;border-top:1px solid rgba(255,255,255,.07)}
.statband .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.stat{padding:38px 26px;text-align:center;border-right:1px solid rgba(255,255,255,.08)}
.stat:last-child{border-right:0}
.stat .v{font-family:var(--serif);font-size:2.5rem;color:var(--gold-light);line-height:1;margin-bottom:.35em}
.stat .l{font-size:.82rem;color:#a9bad3;letter-spacing:.02em;line-height:1.45}

/* generic section header */
.sec-head{max-width:64ch}
.sec-head.center{margin:0 auto 54px}
.sec-head h2{margin-bottom:.35em}
.sec-head p{font-size:1.12rem;color:var(--body)}

/* grids & cards */
.grid{display:grid;gap:26px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px;box-shadow:var(--shadow-sm);transition:transform .25s var(--ease),box-shadow .25s,border-color .25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d8e1ee}
.card h3{margin-bottom:.5em}
.card p:last-child{margin-bottom:0}
.card .kicker{font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;
  color:var(--gold-deep);font-weight:700;margin-bottom:.7em}
.icon-badge{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;
  justify-content:center;background:linear-gradient(135deg,var(--navy),var(--indigo-soft));
  color:var(--gold-light);margin-bottom:20px}
.icon-badge svg{width:26px;height:26px}
.num-badge{font-family:var(--serif);font-size:1.5rem;color:var(--gold);
  width:54px;height:54px;border:1.5px solid var(--gold);border-radius:50%;
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;flex:none}
ul.ticks{list-style:none;margin:0;padding:0}
ul.ticks li{position:relative;padding:.35em 0 .35em 1.7em;font-size:.97rem}
ul.ticks li::before{content:"";position:absolute;left:0;top:.72em;width:12px;height:7px;
  border-left:2px solid var(--gold-deep);border-bottom:2px solid var(--gold-deep);
  transform:rotate(-45deg)}
.section--navy ul.ticks li::before{border-color:var(--gold-light)}

/* split feature */
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.split img{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:100%}
.split--rev .split-media{order:2}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;counter-reset:s}
.step{position:relative}
.step .num-badge{margin-bottom:16px}
.step h3{font-size:1.15rem}

/* pricing */
.ptiers{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;align-items:stretch}
.ptier{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 22px;display:flex;flex-direction:column;transition:transform .25s,box-shadow .25s}
.ptier:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.ptier.feat{border:1.5px solid var(--gold);box-shadow:0 18px 44px rgba(201,161,90,.18);position:relative}
.ptier.feat::before{content:"Most Popular";position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--gold);color:var(--navy-deep);font-size:.68rem;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;padding:.4em 1em;border-radius:999px;white-space:nowrap}
.ptier .pname{font-family:var(--serif);font-size:1.16rem;color:var(--ink);margin-bottom:.3em}
.ptier .price{font-family:var(--serif);font-size:2.1rem;color:var(--navy);line-height:1}
.ptier .cad{font-size:.8rem;color:var(--muted);margin:.3em 0 1em}
.ptier .bestfor{font-size:.85rem;color:var(--body);min-height:2.6em;margin-bottom:14px}
.ptier ul.ticks{margin:14px 0 22px;flex:1}
.ptier ul.ticks li{font-size:.88rem;padding-left:1.5em}
.ptier .btn{width:100%;justify-content:center}

/* faq */
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{width:100%;text-align:left;background:none;border:0;cursor:pointer;
  padding:24px 44px 24px 0;font-family:var(--serif);font-size:1.14rem;color:var(--ink);
  position:relative;line-height:1.3}
.faq-q::after{content:"";position:absolute;right:6px;top:30px;width:11px;height:11px;
  border-right:2px solid var(--gold-deep);border-bottom:2px solid var(--gold-deep);
  transform:rotate(45deg);transition:transform .25s}
.faq-item.open .faq-q::after{transform:rotate(-135deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease)}
.faq-a p{padding:0 0 24px;color:var(--body);margin:0}
.faq-cat{font-size:.8rem;text-transform:uppercase;letter-spacing:.13em;color:var(--gold-deep);
  font-weight:700;margin:40px 0 8px}

/* team */
.team-card{text-align:left}
.team-card .photo{position:relative;padding-top:100%;border-radius:var(--radius);overflow:hidden;
  margin-bottom:18px;background:var(--navy);box-shadow:var(--shadow-sm)}
.team-card .photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.team-card .tname{font-family:var(--serif);font-size:1.2rem;color:var(--ink)}
.team-card .trole{color:var(--gold-deep);font-weight:600;font-size:.9rem;margin-bottom:.2em}
.team-card .tfocus{font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin-bottom:.7em}

/* page hero (interior) */
.page-hero{position:relative;background:var(--navy);color:#cdd9ea;overflow:hidden}
.page-hero-bg{position:absolute;inset:0;z-index:0}
.page-hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.42}
.page-hero-bg::after{content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,var(--navy) 40%,rgba(11,30,59,.6))}
.page-hero-inner{position:relative;z-index:2;padding:78px 0 72px;max-width:720px}
.page-hero h1{color:#fff}
.page-hero p{font-size:1.18rem;color:#c3d1e6;max-width:60ch;margin:0}
.breadcrumb{font-size:.82rem;color:var(--gold-light);letter-spacing:.05em;margin-bottom:1.2em}
.breadcrumb a{color:#a9bad3}
.breadcrumb a:hover{color:#fff}

/* industry blocks */
.industry-block{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:64px 0;
  border-bottom:1px solid var(--line)}
.industry-block:last-child{border-bottom:0}
.industry-block img{border-radius:var(--radius-lg);box-shadow:var(--shadow);width:100%}
.industry-block.rev .ib-media{order:2}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chip{background:var(--bg-alt);border:1px solid var(--line);border-radius:999px;
  padding:.4em .95em;font-size:.82rem;color:var(--body)}

/* scenario cards */
.scenario{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
  box-shadow:var(--shadow-sm)}
.scenario-head{padding:28px 30px 0}
.scenario .ind{font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;color:var(--gold-deep);font-weight:700}
.scenario-body{padding:20px 30px 30px}
.scenario .metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:22px 0;
  padding:22px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.scenario .metrics .m .mv{font-family:var(--serif);font-size:1.7rem;color:var(--navy);line-height:1}
.scenario .metrics .m .ml{font-size:.74rem;color:var(--muted);margin-top:.4em;line-height:1.3}
.scenario blockquote{margin:0;font-style:italic;color:var(--body);font-size:.96rem;
  border-left:3px solid var(--gold);padding-left:16px}

/* callout / CTA band */
.cta-band{background:linear-gradient(120deg,var(--navy),var(--indigo));color:#fff;
  border-radius:var(--radius-lg);padding:60px;text-align:center;position:relative;overflow:hidden}
.cta-band h2{color:#fff}
.cta-band p{color:#c9d6e8;font-size:1.15rem;max-width:52ch;margin:0 auto 1.8em}
.cta-band .btn-row{justify-content:center}

/* forms */
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:40px;box-shadow:var(--shadow)}
.field{margin-bottom:18px}
.field label{display:block;font-size:.86rem;font-weight:600;color:var(--ink);margin-bottom:.4em}
.field input,.field select,.field textarea{width:100%;font-family:var(--sans);font-size:1rem;
  padding:.85em 1em;border:1.5px solid var(--line);border-radius:var(--radius-sm);
  background:#fdfefe;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--indigo);
  box-shadow:0 0 0 3px rgba(23,51,95,.1)}
.field textarea{min-height:130px;resize:vertical}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.hp{position:absolute;left:-9999px;opacity:0;height:0;width:0}
.form-note{font-size:.82rem;color:var(--muted);margin-top:6px}
.alert{padding:14px 18px;border-radius:var(--radius-sm);margin-bottom:20px;font-size:.94rem}
.alert-ok{background:#eef8f0;border:1px solid #bfe3c6;color:#1c6b34}
.alert-err{background:#fdeeee;border:1px solid #f2c4c4;color:#a52222}

/* value list on dark */
.vp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.vp{padding:28px;border:1px solid rgba(255,255,255,.12);border-radius:var(--radius);
  background:rgba(255,255,255,.03)}
.vp h3{color:#fff;font-size:1.2rem}
.vp p{color:#b9c7dc;margin:0}

/* footer */
.site-footer{background:var(--navy-deep);color:#9fb2cd;padding:70px 0 34px;font-size:.92rem}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px;
  border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand .brand{color:#fff;margin-bottom:14px}
.footer-brand p{max-width:34ch;color:#8ea3c0}
.footer-col h4{font-family:var(--sans);font-size:.78rem;text-transform:uppercase;letter-spacing:.14em;
  color:#c9a15a;font-weight:700;margin-bottom:16px}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin-bottom:10px}
.footer-col a{color:#a9bcd6}
.footer-col a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;
  gap:12px;padding-top:26px;font-size:.84rem;color:#7b90ae}
.footer-bottom a{color:#7b90ae}

/* misc reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* responsive */
@media(max-width:960px){
  .g4,.steps,.vp-grid{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  .ptiers{grid-template-columns:repeat(2,1fr)}
  .statband .grid{grid-template-columns:repeat(2,1fr)}
  .stat{border-bottom:1px solid rgba(255,255,255,.08)}
  .split,.industry-block,.industry-block.rev{grid-template-columns:1fr;gap:30px}
  .split--rev .split-media,.industry-block.rev .ib-media{order:0}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  body{font-size:16px}
  h1{font-size:clamp(1.95rem,7.4vw,2.5rem)}
  .btn{white-space:normal;text-align:center}
  .btn-row .btn{width:100%;justify-content:center}
  .hero .sub,.page-hero p,.lead,.sec-head p,.trust-line{max-width:100%}
  .section{padding:64px 0}
  .nav-links,.nav .nav-cta .btn{display:none}
  .nav-toggle{display:block}
  .nav-links.open{display:flex;position:absolute;top:74px;left:0;right:0;flex-direction:column;
    background:#fff;border-bottom:1px solid var(--line);padding:14px 20px;gap:2px;
    box-shadow:var(--shadow)}
  .nav-links.open a{padding:.8em .5em;width:100%;font-size:1rem}
  .g2,.g3,.g4,.steps,.vp-grid,.ptiers,.field-row,.scenario .metrics,.statband .grid{grid-template-columns:1fr}
  .cta-band{padding:40px 26px}
  .form-card{padding:26px}
  .hero-inner{padding:72px 0 64px}
  .stat{border-right:0}
  .footer-top{grid-template-columns:1fr}
}