/* ── nav.css ── */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.3rem 5rem;
  background: rgba(242, 240, 235, 0.92);
  border-bottom: 1px solid var(--ink-12);
  position: sticky;
  top: 0;
  z-index: 200;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: padding var(--transition), box-shadow var(--transition), background var(--transition);
}

nav.scrolled {
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
  box-shadow: 0 1px 0 var(--ink-12), 0 4px 24px rgba(12, 24, 36, 0.06);
}

.logo {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.logo span { color: var(--blue-accent); }

.nav-links {
  display: flex;
  gap: 2.2rem;
  align-items: center;
}
.nav-links a {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-50);
  transition: color var(--transition);
  position: relative;
}
.nav-links a:hover { color: var(--ink); }

.nav-cta {
  background: var(--blue-accent) !important;
  color: white !important;
  padding: 0.5rem 1.3rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition) !important;
}
.nav-cta:hover { background: var(--blue-deep) !important; color: white !important; }

.nav-links a.active { color: var(--blue-accent); }
.nav-links a.active:not(.nav-cta)::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0; right: 0;
  height: 2px;
  background: var(--blue-accent);
  border-radius: 2px;
}

#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--blue-accent);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.2s;
  pointer-events: none;
  box-shadow: 0 4px 20px rgba(26, 106, 191, 0.3);
}
#back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
#back-to-top:hover { background: var(--blue-deep); }

#page-loader {
  position: fixed;
  inset: 0;
  background: var(--cream);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease;
}
#page-loader.hidden { opacity: 0; pointer-events: none; }
.loader-logo {
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--blue-accent);
  font-style: italic;
  animation: loaderPulse 0.8s ease infinite alternate;
}
@keyframes loaderPulse { from { opacity: 0.3; } to { opacity: 1; } }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  nav { padding: 1rem 1.5rem; flex-wrap: wrap; }
  nav.scrolled { padding: 0.75rem 1.5rem; }
  .nav-hamburger { display: flex; }
  .nav-links { display: none; width: 100%; flex-direction: column; align-items: flex-start; gap: 0; padding: 1rem 0 0.5rem; }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 0.65rem 0; border-bottom: 1px solid var(--ink-6); width: 100%; }
  .nav-cta { margin-top: 0.5rem; text-align: center; border-radius: var(--radius-sm); }
}