/* ============================================================
   HCD AI Sales — One-Page Engine Infographic
   Single-screen reference with click-to-expand pillar engines.
   ============================================================ */

:root{
  --hcd-blue:#507392;
  --hcd-blue-deep:#2f4a63;
  --hcd-blue-dark:#1a2c3e;
  --hcd-orange:#f68121;
  --hcd-orange-deep:#ff6a00;
  --ink:#1a2230;
  --body:#4b5563;
  --soft:#f5f8fa;
  --night:#0a1628;
  --line:rgba(255,255,255,.08);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Mulish',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  color:var(--body);
  background:var(--night);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{
  font-family:'Literata',Georgia,serif;
  color:var(--ink);
  line-height:1.15;
  margin:0 0 .5em;
}
a{color:inherit;text-decoration:none}
em{font-style:italic;color:var(--hcd-orange);font-weight:inherit}


/* ============================================================
   TOPBAR
   ============================================================ */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(10,22,40,.85);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  max-width:1280px;
  margin:0 auto;
  padding:14px 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{
  font-family:'Literata',serif;
  font-weight:900;font-size:24px;
  color:#fff;
  letter-spacing:1px;
}
.brand-tag{
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:3px;font-size:13px;
  color:var(--hcd-orange);
  text-transform:uppercase;
  border-left:1px solid rgba(255,255,255,.18);
  padding-left:10px;
}
.topnav-link{
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:3px;font-size:12px;
  color:rgba(255,255,255,.65);
  text-transform:uppercase;
  transition:color .2s;
}
.topnav-link:hover{color:var(--hcd-orange)}


/* ============================================================
   HERO
   ============================================================ */
.hero{
  position:relative;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(246,129,33,.18) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 80%, rgba(80,115,146,.25) 0%, transparent 60%),
    linear-gradient(160deg, var(--hcd-blue-dark) 0%, #0a1628 70%);
  color:#fff;
  padding:80px 24px 60px;
  overflow:hidden;
  text-align:center;
}
.hero::before{
  content:"";
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size:60px 60px;
  pointer-events:none;
  mask-image:radial-gradient(ellipse at center, #000 0%, transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at center, #000 0%, transparent 75%);
}
.hero-inner{
  position:relative;
  max-width:960px;
  margin:0 auto;
}
.hero-eyebrow{
  display:inline-block;
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:5px;font-size:14px;
  color:var(--hcd-orange);
  padding:8px 20px;
  border:1px solid rgba(246,129,33,.45);
  border-radius:50px;
  background:rgba(246,129,33,.08);
  backdrop-filter:blur(8px);
  margin-bottom:22px;
  text-transform:uppercase;
}
.hero-headline{
  font-family:'Literata',serif;
  font-weight:900;
  font-size:clamp(36px,5.5vw,68px);
  line-height:1.04;
  color:#fff;
  margin:0 0 18px;
  text-shadow:0 8px 40px rgba(0,0,0,.5);
}
.hero-headline .accent{color:var(--hcd-orange);font-style:italic}
.hero-sub{
  font-size:clamp(15px,1.4vw,18px);
  color:rgba(255,255,255,.78);
  max-width:560px;
  margin:0 auto 30px;
  line-height:1.55;
}
.expand-all{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 24px;
  background:linear-gradient(135deg, var(--hcd-orange), var(--hcd-orange-deep));
  color:#fff;
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:3px;font-size:13px;
  text-transform:uppercase;
  border:none;
  border-radius:50px;
  cursor:pointer;
  box-shadow:0 8px 28px rgba(246,129,33,.4);
  transition:transform .2s, box-shadow .2s;
}
.expand-all:hover{
  transform:translateY(-2px);
  box-shadow:0 12px 36px rgba(246,129,33,.55);
}
.expand-all-icon{
  width:16px;height:16px;
  transition:transform .3s ease;
}


/* ============================================================
   PILLARS GRID
   4 cards across on desktop, 2 on tablet, 1 on mobile
   ============================================================ */
.pillars{
  max-width:1280px;
  margin:0 auto;
  padding:50px 24px 60px;
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:20px;
  align-items:start;
}
.pillar{
  background:linear-gradient(180deg, #1a2c3e 0%, #14202d 100%);
  border:1px solid var(--line);
  border-radius:20px;
  overflow:hidden;
  position:relative;
  transition:border-color .3s, box-shadow .3s, transform .3s;
}
.pillar:hover{
  border-color:rgba(246,129,33,.4);
  box-shadow:0 20px 50px rgba(0,0,0,.45), 0 0 0 1px rgba(246,129,33,.15);
  transform:translateY(-3px);
}
.pillar.is-open{
  border-color:rgba(246,129,33,.55);
  box-shadow:0 24px 60px rgba(246,129,33,.18), 0 0 0 1px rgba(246,129,33,.35);
  grid-column:1 / -1;
}
.pillar.is-open .pillar-image{
  height:280px;
}
.pillar.is-open:hover{transform:none}

.pillar-image{
  width:100%;
  height:160px;
  background-size:cover;
  background-position:center;
  background-color:#0c1b2e;
  position:relative;
  overflow:hidden;
  transition:height .35s ease;
}
.pillar-image::after{
  content:"";
  position:absolute;inset:0;
  z-index:2;
  pointer-events:none;
  background:linear-gradient(180deg, rgba(10,22,40,0) 40%, rgba(10,22,40,.85) 100%);
}
.pillar-video{
  position:absolute;inset:0;
  width:100%;height:100%;
  object-fit:cover;
  opacity:0;
  transition:opacity .5s ease;
  z-index:1;
  pointer-events:none;
}
.pillar.is-open .pillar-video.is-ready{opacity:1}
@media (prefers-reduced-motion: reduce){
  .pillar-video{display:none}
}

.pillar-body{
  padding:22px 22px 24px;
  position:relative;
}
.pillar-meta{
  display:flex;
  align-items:baseline;
  gap:12px;
  margin-bottom:14px;
}
.pillar-number{
  font-family:'Literata',serif;
  font-weight:900;
  font-size:14px;
  color:var(--hcd-orange);
  letter-spacing:1px;
}
.pillar-name{
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:3.5px;
  font-size:18px;
  color:#fff;
  text-transform:uppercase;
}
.pillar-headline{
  font-family:'Literata',serif;
  font-weight:700;
  font-size:20px;
  color:#fff;
  line-height:1.25;
  margin:0 0 10px;
}
.pillar-headline em{color:var(--hcd-orange);font-style:italic}
.pillar-sub{
  font-size:14px;
  color:rgba(255,255,255,.65);
  line-height:1.55;
  margin-bottom:18px;
  min-height:44px;
}

.engine-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 16px;
  background:rgba(246,129,33,.12);
  border:1px solid rgba(246,129,33,.4);
  border-radius:50px;
  color:var(--hcd-orange);
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:2.5px;font-size:11px;
  text-transform:uppercase;
  cursor:pointer;
  transition:background .2s, border-color .2s, transform .2s;
}
.engine-toggle:hover{
  background:rgba(246,129,33,.22);
  border-color:rgba(246,129,33,.7);
}
.engine-toggle-icon{
  width:14px;height:14px;
  transition:transform .3s ease;
}
.is-open .engine-toggle-icon{transform:rotate(180deg)}


/* ============================================================
   ENGINE — expanded content
   ============================================================ */
.engine{
  overflow:hidden;
  max-height:0;
  transition:max-height .45s ease;
  border-top:1px solid var(--line);
  background:rgba(0,0,0,.18);
}
.engine[hidden]{display:none}
.engine-head{
  padding:24px 28px 8px;
}
.engine-eyebrow{
  display:inline-block;
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:4px;font-size:11px;
  color:var(--hcd-orange);
  text-transform:uppercase;
  margin-bottom:10px;
  padding:5px 12px;
  background:rgba(246,129,33,.1);
  border-radius:50px;
  border:1px solid rgba(246,129,33,.3);
}
.engine-stat{
  font-family:'Literata',serif;
  font-size:18px;
  color:rgba(255,255,255,.88);
  line-height:1.5;
  font-style:italic;
  max-width:760px;
}
.engine-stat strong{
  color:var(--hcd-orange);
  font-style:normal;
  font-weight:900;
}

.engine-grid{
  list-style:none;
  padding:18px 28px 28px;
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:14px;
}
.engine-grid-channels{
  grid-template-columns:repeat(3, 1fr);
  padding-bottom:8px;
}
.engine-grid-ops{
  grid-template-columns:repeat(2, 1fr);
  padding-top:8px;
  padding-bottom:28px;
  border-top:1px dashed rgba(255,255,255,.08);
  margin:0 28px;
  padding-left:0;
  padding-right:0;
}
.engine-item{
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:14px 16px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.06);
  border-radius:12px;
  transition:background .2s, border-color .2s;
}
.engine-item:hover{
  background:rgba(246,129,33,.08);
  border-color:rgba(246,129,33,.3);
}
.engine-item.channel{
  align-items:center;
}
.engine-icon{
  flex-shrink:0;
  width:38px;height:38px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg, rgba(246,129,33,.2), rgba(246,129,33,.05));
  border:1px solid rgba(246,129,33,.35);
  border-radius:10px;
  color:var(--hcd-orange);
}
.engine-icon svg{
  width:20px;height:20px;
  display:block;
}
.engine-item div{display:flex;flex-direction:column;gap:2px;line-height:1.35}
.engine-item strong{
  color:#fff;
  font-family:'Mulish',sans-serif;
  font-weight:800;
  font-size:14px;
  letter-spacing:.2px;
}
.engine-item span{
  color:rgba(255,255,255,.6);
  font-size:12.5px;
  line-height:1.45;
}


/* ============================================================
   FOOTER STRIPE — bottom-line CTA
   ============================================================ */
.footer-stripe{
  background:
    linear-gradient(135deg, rgba(246,129,33,.18) 0%, rgba(246,129,33,.02) 100%),
    linear-gradient(160deg, var(--hcd-blue) 0%, var(--hcd-blue-deep) 100%);
  border-top:1px solid rgba(246,129,33,.28);
  border-bottom:1px solid rgba(246,129,33,.28);
  padding:42px 24px;
  position:relative;
  overflow:hidden;
}
.footer-stripe::before{
  content:"";
  position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg, var(--hcd-orange), var(--hcd-orange-deep));
}
.footer-stripe-inner{
  max-width:1280px;
  margin:0 auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  flex-wrap:wrap;
}
.footer-stripe-eyebrow{
  display:block;
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:4px;font-size:12px;
  color:var(--hcd-orange);
  text-transform:uppercase;
  margin-bottom:8px;
}
.footer-stripe-headline{
  font-family:'Literata',serif;
  font-weight:900;
  font-size:clamp(22px,2.5vw,32px);
  color:#fff;
  margin:0;
  line-height:1.18;
}
.footer-stripe-cta{
  display:flex;
  align-items:center;
  gap:18px;
  flex-wrap:wrap;
}
.btn-primary{
  display:inline-block;
  padding:15px 30px;
  background:linear-gradient(135deg, var(--hcd-orange), var(--hcd-orange-deep));
  color:#fff !important;
  font-family:'Literata',serif;
  font-weight:900;
  font-size:16px;
  border-radius:50px;
  box-shadow:0 10px 32px rgba(246,129,33,.4);
  transition:transform .2s, box-shadow .2s;
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 14px 40px rgba(246,129,33,.55);
}
.btn-secondary{
  color:rgba(255,255,255,.78) !important;
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:3px;font-size:12px;
  border-bottom:1px solid rgba(255,255,255,.3);
  padding-bottom:3px;
  transition:color .2s, border-color .2s;
}
.btn-secondary:hover{
  color:var(--hcd-orange) !important;
  border-color:var(--hcd-orange);
}

.page-footer{
  padding:24px;
  text-align:center;
  font-family:'Bebas Neue',sans-serif;
  letter-spacing:3px;font-size:11px;
  color:rgba(255,255,255,.32);
  text-transform:uppercase;
}


/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:1100px){
  .pillars{grid-template-columns:repeat(2, 1fr)}
  .pillar.is-open{grid-column:1 / -1}
  .engine-grid{grid-template-columns:repeat(2, 1fr)}
  .engine-grid-channels{grid-template-columns:repeat(3, 1fr)}
}
@media(max-width:680px){
  .pillars{grid-template-columns:1fr;padding:30px 16px 40px}
  .engine-grid,.engine-grid-channels{grid-template-columns:repeat(2, 1fr);padding:18px 16px 24px}
  .engine-grid-ops{grid-template-columns:1fr;margin:0 16px}
  .engine-head{padding:20px 16px 6px}
  .pillar-body{padding:18px}
  .footer-stripe{padding:32px 20px}
  .footer-stripe-inner{flex-direction:column;text-align:center;align-items:center}
  .pillar.is-open .pillar-image{height:200px}
  .topbar-inner{padding:12px 16px}
  .hero{padding:60px 20px 50px}
}
@media(max-width:420px){
  .engine-grid,.engine-grid-channels{grid-template-columns:1fr}
}


/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important}
  html{scroll-behavior:auto}
}