/* ── Navigation ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-navy) 96%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: box-shadow var(--transition);
}
.site-header--scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.4); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}
.nav__logo img {
  height: 42px;
  width: auto;
  object-fit: contain;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}
.nav__links a {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: rgba(232,230,224,0.8);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}
.nav__links a:hover,
.nav__links a.active {
  color: #fff;
}
.nav__links a:hover::after,
.nav__links a.active::after { width: 100%; }

.nav__cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-full);
  color: rgba(232,230,224,0.7);
  background: rgba(255,255,255,0.06);
  transition: all var(--transition);
}
.theme-toggle:hover { color: var(--color-primary); background: rgba(255,255,255,0.1); }

/* Hamburger (mobile) */
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  color: rgba(232,230,224,0.8);
}
.nav__burger span {
  display: block;
  width: 24px; height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile nav drawer */
.nav__mobile {
  display: none;
  flex-direction: column;
  background: var(--color-navy);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: var(--space-6) var(--space-6) var(--space-8);
  gap: var(--space-1);
}
.nav__mobile a {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: rgba(232,230,224,0.8);
  text-decoration: none;
  padding: var(--space-3) 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color var(--transition);
}
.nav__mobile a:hover { color: var(--color-primary); }
.nav__mobile .btn--primary { margin-top: var(--space-4); align-self: flex-start; }

@media (max-width: 768px) {
  .nav__links, .nav__cta .btn { display: none; }
  .nav__burger { display: flex; }
}

.nav__mobile--open { display: flex; }

/* Nav burger active */
.nav__burger--active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger--active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav__burger--active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }