/* ── Navigation ──────────────────────────────────── */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#main-nav.nav--scrolled {
  background: rgba(255,255,255,0.97);
  box-shadow: 0 1px 0 var(--color-border), 0 4px 16px rgba(13,19,33,0.05);
}

/* When nav sits over the dark hero, shift to dark glass */
#main-nav.nav--hero {
  background: rgba(13,19,33,0.75);
  border-bottom-color: var(--color-hero-border);
}

#main-nav.nav--hero .nav-logo,
#main-nav.nav--hero .nav-link {
  color: var(--color-hero-text);
}

#main-nav.nav--hero .nav-link:hover {
  color: rgba(245,244,241,0.72);
}

#main-nav.nav--hero .nav-cta {
  background: rgba(245,244,241,0.12);
  color: var(--color-hero-text);
  border: 1px solid rgba(245,244,241,0.22);
}

#main-nav.nav--hero .nav-cta:hover {
  background: rgba(245,244,241,0.20);
}

.nav-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.025em;
  text-decoration: none;
  transition: color var(--transition);
  white-space: nowrap;
}

.nav-logo:hover { color: var(--color-ink); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-muted);
  letter-spacing: 0.005em;
  transition: color var(--transition);
  text-decoration: none;
}

.nav-link:hover,
.nav-link--active { color: var(--color-ink-secondary); }

.nav-cta {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink-secondary);
  background: transparent;
  border: 1.5px solid var(--color-border-strong);
  padding: 8px 18px;
  border-radius: var(--radius);
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-cta:hover {
  background: var(--color-ink-secondary);
  border-color: var(--color-ink-secondary);
  color: #fff;
  transform: translateY(-1px);
}

/* ── Hamburger ───────────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink-secondary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Mobile ──────────────────────────────────────── */
@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-cta    { display: none; }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 20px;
    box-shadow: 0 8px 24px rgba(13,19,33,0.08);
  }

  .nav-menu--open { display: flex; }

  .nav-menu li { padding: 0 24px; }

  .nav-link {
    display: block;
    padding: 11px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-ink-secondary);
  }

  .nav-menu li:last-child .nav-link { border-bottom: none; }
}