:root{
  /* SignalNav root palette */
  --sn-navy: #0B1F33;
  --sn-slate: #1F3A5F;
  --sn-teal: #2EC4C6;
  --sn-gray: #E6E9EE;

  --sn-ink: rgba(11,31,51,.82);
  --sn-ink2: rgba(31,58,95,.72);
  --sn-muted: rgba(31,58,95,.55);

  --sn-radius: 16px;
  --sn-shadow: 0 12px 28px rgba(11,31,51,.08);
  --sn-border: rgba(31,58,95,.12);
}

*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
  background:#fff;
  color: var(--sn-ink);
}

a{ color: inherit; text-decoration: none; }
a:hover{ text-decoration: underline; }

.sn-container{
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
}

.sn-top{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--sn-border);
}

.sn-top__inner{
  display:flex;
  align-items:center;
  justify-content: space-between;
  padding: 14px 0;
}

.sn-brand__name{
  font-weight: 650;
  letter-spacing: -0.02em;
  font-size: 20px;
  color: rgba(11,31,51,.78);
}
.sn-brand__nav{ font-weight: 800; }

.sn-nav{
  display:flex;
  gap: 14px;
  font-size: 14px;
  color: var(--sn-muted);
}
.sn-nav__link{ padding: 6px 8px; border-radius: 10px; }
.sn-nav__link:hover{
  background: rgba(46,196,198,.10);
  text-decoration: none;
  color: rgba(11,31,51,.72);
}

/* Hero */
.sn-hero{
  padding: 54px 0 24px;
}
.sn-hero__inner{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 28px;
  align-items: center;
}

.sn-h1{
  margin: 0;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: rgba(11,31,51,.72);
  font-weight: 650;
}
.sn-tagline{
  margin: 10px 0 14px;
  font-size: 20px;
  color: rgba(31,58,95,.58);
}
.sn-lede{
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.55;
  color: rgba(11,31,51,.78);
  max-width: 54ch;
}
.sn-hero__meta{
  display:flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 10px 0 16px;
}

.sn-pill{
  display:inline-flex;
  align-items:center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(46,196,198,.25);
  background: rgba(46,196,198,.08);
  color: rgba(31,58,95,.78);
  font-size: 13px;
}

.sn-hero__cta{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.sn-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 650;
  font-size: 14px;
  border: 1px solid transparent;
  box-shadow: none;
  text-decoration: none !important;
}
.sn-btn--primary{
  background: rgba(46,196,198,.14);
  border-color: rgba(46,196,198,.35);
  color: rgba(11,31,51,.78);
}
.sn-btn--primary:hover{
  background: rgba(46,196,198,.20);
}
.sn-btn--ghost{
  background: #fff;
  border-color: var(--sn-border);
  color: rgba(31,58,95,.72);
}
.sn-btn--ghost:hover{
  background: rgba(11,31,51,.03);
}

.sn-note{
  margin: 14px 0 0;
  font-size: 13px;
  color: rgba(31,58,95,.55);
}

.sn-hero__art{
  display:flex;
  justify-content: center;
}
.sn-signal{
  width: min(420px, 100%);
  height: auto;
  filter: none;
}

/* Sections */
.sn-section{
  padding: 44px 0;
}
.sn-section--tint{
  background: rgba(11,31,51,.02);
  border-top: 1px solid var(--sn-border);
  border-bottom: 1px solid var(--sn-border);
}

.sn-h2{
  margin: 0 0 10px;
  font-size: 24px;
  letter-spacing: -0.01em;
  color: rgba(11,31,51,.78);
}
.sn-h3{
  margin: 0 0 6px;
  font-size: 16px;
  color: rgba(11,31,51,.78);
}
.sn-body{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(31,58,95,.70);
}

.sn-cards{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.sn-card{
  border: 1px solid var(--sn-border);
  border-radius: var(--sn-radius);
  background: #fff;
  box-shadow: var(--sn-shadow);
  padding: 16px 16px 14px;
}

.sn-listgrid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.sn-listitem{
  border: 1px solid var(--sn-border);
  border-radius: var(--sn-radius);
  background: #fff;
  padding: 16px;
}

/* Footer */
.sn-footer{
  padding: 28px 0 36px;
}
.sn-footer__inner{
  display:flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  border-top: 1px solid var(--sn-border);
  padding-top: 20px;
}
.sn-footer__brand{
  font-weight: 800;
  color: rgba(11,31,51,.72);
}
.sn-footer__sub{
  font-size: 13px;
  color: rgba(31,58,95,.55);
  margin-top: 6px;
}
.sn-footer__links{
  font-size: 13px;
  color: rgba(31,58,95,.65);
}

/* Responsive */
@media (max-width: 900px){
  .sn-hero__inner{ grid-template-columns: 1fr; }
  .sn-signal{ width: min(520px, 100%); }
  .sn-cards, .sn-listgrid{ grid-template-columns: 1fr; }
  .sn-h1{ font-size: 44px; }
}