:root{
  /* dark zone (header, hero, footer) */
  --bg:#0a0a0c;
  --bg-alt:#111318;
  --surface:#15171d;
  --border:#262a31;
  --text:#e9e7e3;
  --text-dim:#9a9ea6;
  /* light zone (content sections) */
  --l-bg:#faf9f7;
  --l-bg-alt:#f1efea;
  --l-surface:#ffffff;
  --l-border:#e4e1da;
  --l-text:#1b1d22;
  --l-dim:#555a63;
  /* brand */
  --accent:#f4762a;
  --accent-2:#ffb703;
  --accent-deep:#c95a15;
  --radius:10px;
  --max-w:1160px;
  --font: -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  --font-mono: ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--l-bg);
  color:var(--l-text);
  font-family:var(--font);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-weight:700;
  letter-spacing:-0.02em;
  margin:0 0 .5em;
  color:var(--l-text);
}
h1{font-size:clamp(2.1rem,5vw,3.4rem);line-height:1.1;}
h2{font-size:clamp(1.6rem,3.4vw,2.3rem);line-height:1.2;max-width:34ch;}
h3{font-size:1.15rem;}
p{margin:0 0 1em;color:var(--l-dim);}
a{color:inherit;text-decoration:none;}
.wrap{max-width:var(--max-w);margin:0 auto;padding:0 24px;}
.accent{color:var(--accent);}

.kicker{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.14em;
  color:var(--accent-deep);
  text-transform:uppercase;
  margin:0 0 .9em;
  font-weight:700;
}

/* ===== Dark zone: header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(10,10,12,.88);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.05rem;color:#fff;}
.logo svg{color:var(--accent);flex-shrink:0;}
.logo em{font-style:normal;color:var(--text-dim);font-weight:500;margin-left:.55em;font-size:.7rem;letter-spacing:.02em;border-left:1px solid var(--border);padding-left:.7em;}
.main-nav{display:flex;align-items:center;gap:28px;}
.main-nav a{font-size:.92rem;color:var(--text-dim);transition:color .15s;}
.main-nav a:hover{color:#fff;}
.main-nav a.nav-cta{
  color:#0a0a0c;background:var(--accent);
  padding:9px 16px;border-radius:8px;font-weight:600;
}
.main-nav a.nav-cta:hover{background:var(--accent-2);color:#0a0a0c;}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px;}
.nav-toggle span{width:22px;height:2px;background:#fff;display:block;}

/* ===== Dark zone: hero ===== */
.hero{
  padding:104px 0 88px;
  background:var(--bg);
  color:var(--text);
  border-bottom:1px solid var(--border);
  position:relative;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(600px 300px at 80% -10%, rgba(244,118,42,.16), transparent 60%);
}
.hero h1{color:#fff;}
.hero .kicker{color:var(--accent);}
.hero-inner{position:relative;max-width:800px;}
.hero-sub{font-size:1.1rem;max-width:56ch;color:var(--text-dim);}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin:28px 0 56px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:13px 24px;border-radius:8px;font-weight:600;font-size:.95rem;
  transition:transform .12s, background .15s, border-color .15s;
  border:1px solid transparent;cursor:pointer;
}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--accent);color:#0a0a0c;}
.btn-primary:hover{background:var(--accent-2);}
.btn-ghost{border-color:var(--border);color:var(--text);}
.btn-ghost:hover{border-color:var(--text-dim);}
.btn-block{width:100%;}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;border-top:1px solid var(--border);padding-top:28px;}
.stat{display:flex;flex-direction:column;gap:4px;}
.stat-num{font-family:var(--font-mono);font-size:1.3rem;font-weight:600;color:#fff;}
.stat-label{font-size:.82rem;color:var(--text-dim);}

/* ===== Light zone: sections ===== */
.section{padding:88px 0;border-bottom:1px solid var(--l-border);background:var(--l-bg);}
.section-alt{background:var(--l-bg-alt);}

/* Cards */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px;}
.card{
  background:var(--l-surface);border:1px solid var(--l-border);border-radius:var(--radius);
  padding:26px;transition:border-color .15s, transform .15s, box-shadow .15s;
  box-shadow:0 1px 2px rgba(20,20,25,.04);
}
.card:hover{border-color:#cfcabf;transform:translateY(-2px);box-shadow:0 6px 18px rgba(20,20,25,.07);}
.card-icon{
  width:42px;height:42px;border-radius:8px;background:rgba(244,118,42,.12);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--accent-deep);
}
.card-icon svg{width:22px;height:22px;}
.card p{font-size:.93rem;margin-bottom:0;}

/* Process */
.process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:36px;}
.process-step{border-top:2px solid var(--accent);padding-top:18px;}
.step-num{font-family:var(--font-mono);color:var(--accent-deep);font-size:.85rem;font-weight:700;letter-spacing:.05em;}
.process-step h3{margin-top:10px;}
.process-step p{font-size:.93rem;}

/* Case study */
.case-study-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start;}
.case-badge{
  display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  background:rgba(244,118,42,.13);color:var(--accent-deep);
  border:1px solid rgba(244,118,42,.35);border-radius:999px;padding:4px 12px;margin-bottom:14px;
}
.case-lede{font-size:1.02rem;}
.case-block{margin-top:22px;}
.case-block h4{font-size:.95rem;margin-bottom:.4em;}
.case-block p{font-size:.93rem;}
.case-results{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px;border-top:1px solid var(--l-border);padding-top:22px;}
.case-results div{display:flex;flex-direction:column;gap:4px;}
.case-results strong{color:var(--l-text);font-family:var(--font-mono);font-size:1.05rem;}
.case-results span{font-size:.8rem;color:var(--l-dim);}

.case-study-diagram{
  background:var(--l-surface);border:1px solid var(--l-border);border-radius:var(--radius);
  padding:28px 24px;display:flex;flex-direction:column;align-items:stretch;
  box-shadow:0 1px 2px rgba(20,20,25,.04);
}
.diagram-node{
  background:var(--l-bg-alt);border:1px solid var(--l-border);border-radius:8px;
  padding:13px 16px;font-size:.86rem;text-align:center;color:var(--l-text);
}
.diagram-node-final{border-color:var(--accent);background:rgba(244,118,42,.08);font-weight:600;}
.diagram-arrow{
  width:2px;height:22px;background:linear-gradient(var(--l-border),var(--accent));
  margin:0 auto;position:relative;
}
.diagram-arrow::after{
  content:"";position:absolute;bottom:-1px;left:50%;transform:translateX(-50%);
  width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;
  border-top:6px solid var(--accent);
}

/* Concept project cards */
.concept-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px;}
.concept-card{
  background:var(--l-surface);border:1px solid var(--l-border);border-radius:var(--radius);
  padding:26px;display:flex;flex-direction:column;gap:14px;
  box-shadow:0 1px 2px rgba(20,20,25,.04);
}
.concept-head{display:flex;align-items:center;justify-content:space-between;gap:10px;}
.concept-industry{font-size:.78rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-deep);}
.concept-tag{
  font-size:.68rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;
  color:var(--l-dim);border:1px solid var(--l-border);border-radius:999px;padding:3px 10px;white-space:nowrap;
}
.concept-card h3{margin:0;font-size:1.08rem;}
.concept-card dl{margin:0;display:flex;flex-direction:column;gap:10px;}
.concept-card dt{font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--l-dim);}
.concept-card dd{margin:2px 0 0;font-size:.9rem;color:var(--l-dim);}
.concept-card dd.concept-outcome{color:var(--l-text);font-weight:600;}

/* Tags */
.tag-grid{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px;}
.tag{
  border:1px solid var(--l-border);border-radius:999px;padding:9px 18px;
  font-size:.88rem;color:var(--l-dim);background:var(--l-surface);
}

/* FAQ */
.faq-list{margin-top:36px;max-width:820px;}
.faq-item{
  background:var(--l-surface);border:1px solid var(--l-border);border-radius:var(--radius);
  margin-bottom:12px;overflow:hidden;
}
.faq-item summary{
  cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:18px 22px;font-weight:600;font-size:.98rem;color:var(--l-text);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";font-size:1.3rem;font-weight:400;color:var(--accent-deep);flex-shrink:0;
  transition:transform .18s;line-height:1;
}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-item .faq-body{padding:0 22px 18px;font-size:.93rem;color:var(--l-dim);}
.faq-item .faq-body p{margin-bottom:.6em;}
.faq-item .faq-body p:last-child{margin-bottom:0;}

/* Contact */
.contact-section{border-bottom:none;}
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start;}
.contact-direct{margin-top:22px;font-size:.9rem;}
.contact-direct a{color:var(--accent-deep);font-weight:600;}
.contact-form{
  background:var(--l-surface);border:1px solid var(--l-border);border-radius:var(--radius);
  padding:30px;display:flex;flex-direction:column;gap:16px;
  box-shadow:0 1px 2px rgba(20,20,25,.05);
}
.contact-form label{display:flex;flex-direction:column;gap:6px;font-size:.85rem;color:var(--l-dim);font-weight:600;}
.contact-form input,.contact-form textarea,.contact-form select{
  background:var(--l-bg);border:1px solid var(--l-border);border-radius:7px;
  padding:11px 13px;color:var(--l-text);font-family:var(--font);font-size:.95rem;resize:vertical;font-weight:400;
}
.contact-form input:focus,.contact-form textarea:focus,.contact-form select:focus{outline:none;border-color:var(--accent);}
.form-note{font-size:.78rem;color:var(--l-dim);text-align:center;margin:0;font-weight:400;}

/* ===== Dark zone: footer ===== */
.site-footer{padding:32px 0;background:var(--bg);color:var(--text-dim);}
.footer-inner{display:flex;justify-content:space-between;font-size:.85rem;}
.footer-inner a:hover{color:var(--accent);}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease, transform .6s ease;}
.reveal.is-visible{opacity:1;transform:translateY(0);}

/* Responsive */
@media (max-width:920px){
  .card-grid,.concept-grid{grid-template-columns:repeat(2,1fr);}
  .process-grid{grid-template-columns:repeat(2,1fr);}
  .case-study-grid,.contact-grid{grid-template-columns:1fr;}
  .case-study-diagram{margin-top:20px;}
}
@media (max-width:680px){
  .main-nav{
    position:absolute;top:68px;left:0;right:0;background:var(--bg);
    border-bottom:1px solid var(--border);
    flex-direction:column;align-items:stretch;gap:0;
    max-height:0;overflow:hidden;transition:max-height .25s ease;
  }
  .main-nav.is-open{max-height:400px;}
  .main-nav a{padding:16px 24px;border-bottom:1px solid var(--border);}
  .main-nav a.nav-cta{margin:14px 24px;text-align:center;}
  .nav-toggle{display:flex;}
  .logo em{display:none;}
  .card-grid,.process-grid,.concept-grid{grid-template-columns:1fr;}
  .hero-stats{grid-template-columns:1fr;gap:16px;}
  .hero{padding:80px 0 56px;}
  .section{padding:64px 0;}
}