/* ============================================================
   nav.css — sticky navigation: logo, links, mobile menu, scroll hairline
   ============================================================ */

.nav{
  position:sticky; top:0; z-index:50;
  background:var(--bg-base);
  border-bottom:1px solid transparent;
  transition:border-color .3s ease, background .3s ease;
}
.nav.scrolled{
  border-bottom-color:var(--border-hairline);
  background:color-mix(in srgb, var(--bg-base) 90%, transparent);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}

.nav-inner{
  display:flex; align-items:center; justify-content:space-between;
  height:68px;
  max-width:var(--maxw); margin:0 auto;
  padding-left:40px; padding-right:40px;
}
@media (max-width:900px){ .nav-inner{ padding-left:32px; padding-right:32px; } }
@media (max-width:640px){ .nav-inner{ padding-left:24px; padding-right:24px; } }

.brand{
  display:flex; align-items:center; gap:9px;
  font-weight:600; font-size:1rem; color:var(--text-ink);
  background:none; border:none; cursor:pointer; font-family:inherit;
}
.brand-dot{
  width:8px; height:8px; border-radius:50%;
  background:var(--brand-accent);
  position:relative;
}
.brand-dot::after{
  content:'';
  position:absolute; inset:0; border-radius:50%;
  border:1.5px solid var(--brand-accent);
  opacity:0;
}
.brand-dot.echo-pulse::after{
  animation: navEcho .8s var(--ease) forwards;
}
@keyframes navEcho{
  0%{ opacity:.9; transform:scale(1); }
  100%{ opacity:0; transform:scale(3.5); }
}

.nav-links{ display:flex; align-items:center; gap:32px; }
.nav-link{
  font-size:.92rem; color:var(--text-muted);
  transition:color .2s ease;
}
.nav-link:hover{ color:var(--text-ink); }

.nav-cta{
  font-size:.9rem; color:var(--text-ink);
  border:1px solid var(--border-hairline);
  padding:.5rem 1rem; border-radius:999px;
  transition:border-color .2s ease, background .2s ease, color .2s ease;
}
.nav-cta:hover{ border-color:var(--text-ink); background:var(--text-ink); color:var(--bg-base); }

/* ---- Mobile menu button ---- */
.nav-menu-btn{
  display:none;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.1em; text-transform:uppercase;
  color:var(--text-ink); background:none; border:none; cursor:pointer;
}

/* ---- Mobile dropdown panel ---- */
.nav-mobile-panel{
  display:none;
  flex-direction:column;
  gap:24px;
  padding:24px 24px 40px;
  border-top:1px solid var(--border-hairline);
}
.nav-mobile-panel a.h3{ color:var(--text-ink); }

@media (max-width:640px){
  .nav-links:not(.nav-mobile-panel){ display:none; }
  .nav-menu-btn{ display:block; }
  .nav.open .nav-mobile-panel{ display:flex; }
}