:root {
  --bg:#f4f7fa;
  --surface:#ffffff;
  --ink:#0b1726;
  --muted:#5b6978;
  --line:#d9e1e8;
  --blue:#1263ff;
  --deep:#07111f;
  --shell:1180px;
}
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--ink);
}
a { color:inherit; text-decoration:none; }
.shell { width:min(var(--shell),calc(100% - 48px)); margin:0 auto; }
.site-header {
  position:sticky;
  top:0;
  z-index:20;
  background:rgba(244,247,250,.88);
  backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(217,225,232,.85);
}
.nav { min-height:72px; display:flex; align-items:center; gap:28px; }
.logo { display:flex; align-items:center; gap:10px; font-weight:800; }
.logo-mark {
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  border-radius:9px;
  background:var(--deep);
  color:#fff;
  font-size:12px;
}
nav { display:flex; gap:22px; margin-left:auto; color:var(--muted); font-size:14px; }
.nav-cta { padding:11px 16px; border-radius:999px; background:var(--ink); color:#fff; font-size:14px; font-weight:700; }
.hero { padding:120px 0 110px; }
.eyebrow,.section-kicker { font-size:12px; font-weight:800; letter-spacing:.14em; text-transform:uppercase; color:var(--blue); }
h1 { max-width:1050px; margin:24px 0 30px; font-size:clamp(3.5rem,7.5vw,7.3rem); line-height:.92; letter-spacing:-.065em; }
.hero-lead { max-width:820px; font-size:clamp(1.15rem,2vw,1.45rem); line-height:1.65; color:#314152; }
.hero-actions { display:flex; gap:12px; margin-top:36px; flex-wrap:wrap; }
.button { padding:14px 19px; border-radius:999px; font-weight:750; font-size:14px; }
.button.primary { background:var(--blue); color:#fff; }
.button.ghost { border:1px solid var(--line); background:rgba(255,255,255,.55); }
.hero-note { margin-top:34px; color:var(--muted); font-size:13px; }
.section { padding:110px 0; border-top:1px solid var(--line); }
.section h2 { max-width:900px; margin:18px 0 0; font-size:clamp(2.3rem,4.8vw,4.8rem); line-height:1; letter-spacing:-.045em; }
@media (max-width:900px) {
  nav { display:none; }
  .nav-cta { margin-left:auto; }
}
@media (max-width:640px) {
  .shell { width:min(100% - 30px,var(--shell)); }
  .hero { padding:90px 0 80px; }
  h1 { font-size:clamp(3rem,15vw,5rem); }
}

.section-lead {
  max-width: 820px;
  margin: 22px 0 0;
  font-size: 1.18rem;
  line-height: 1.75;
  color: var(--muted);
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 54px;
}

.concept-card {
  min-height: 250px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
}

.card-index {
  display: inline-block;
  margin-bottom: 48px;
  font-size: 12px;
  font-weight: 800;
  color: var(--blue);
}

.concept-card h3 {
  margin: 0 0 12px;
  font-size: 1.35rem;
}

.concept-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.section-dark {
  padding: 120px 0;
  background: var(--deep);
  color: #fff;
}

.section-kicker.light {
  color: #8fb6ff;
}

.light-text {
  color: #b8c4d6;
}

.flow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 52px;
  flex-wrap: wrap;
}

.flow span {
  padding: 14px 18px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  background: rgba(255,255,255,.06);
  font-weight: 700;
}

.flow b {
  color: #7998c9;
}

.stack-diagram {
  display: grid;
  justify-items: start;
  gap: 12px;
  margin-top: 54px;
}

.stack-diagram span {
  min-width: 320px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  font-weight: 750;
}

.stack-diagram i {
  margin-left: 26px;
  color: var(--blue);
  font-style: normal;
  font-size: 1.4rem;
}

.compliance-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 52px;
}

.compliance-grid div {
  padding: 26px;
  border-top: 2px solid var(--ink);
  background: var(--surface);
}

.compliance-grid strong,
.compliance-grid span {
  display: block;
}

.compliance-grid strong {
  margin-bottom: 10px;
}

.compliance-grid span {
  color: var(--muted);
  line-height: 1.55;
}

.section-soft {
  padding: 120px 0;
  background: #edf2f7;
}

.roadmap {
  margin-top: 50px;
  border-top: 1px solid #cbd5e1;
}

.roadmap-item {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid #cbd5e1;
}

.roadmap-item span {
  font-weight: 700;
}

.roadmap-item b {
  color: var(--muted);
  font-size: .9rem;
}

.roadmap-item.done b {
  color: #16794b;
}

.roadmap-item.active b {
  color: var(--blue);
}

.final-cta {
  padding-bottom: 150px;
}

@media (max-width: 900px) {
  .concept-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .compliance-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .concept-grid {
    grid-template-columns: 1fr;
  }

  .stack-diagram span {
    min-width: 0;
    width: 100%;
  }

  .roadmap-item {
    flex-direction: column;
    gap: 6px;
  }
}

.site-footer {
  padding: 80px 0 30px;
  background: #07111f;
  color: #ffffff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
}

.footer-brand {
  margin-bottom: 10px;
  font-size: 1.4rem;
  font-weight: 800;
}

.footer-grid p,
.footer-grid span,
.footer-grid a {
  color: #9fb0c3;
}

.footer-grid strong,
.footer-grid a,
.footer-grid span {
  display: block;
  margin-bottom: 12px;
}

.footer-grid a:hover {
  color: #ffffff;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 70px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.12);
  color: #7f91a5;
  font-size: .85rem;
}

@media (max-width: 700px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
  }
}