.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--hairline);
  transition: background 300ms ease, padding 300ms ease;
}
.nav.is-scrolled {
  background: rgba(10, 10, 11, 0.95);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-2) var(--sp-4);
  max-width: var(--page-max);
  margin: 0 auto;
  transition: padding 300ms ease;
}
.nav.is-scrolled .nav__inner { padding: 0.6rem var(--sp-4); }

.nav__brand {
  display: flex;
  align-items: center;
}
.nav__brand-mark {
  display: flex;
  align-items: center;
}
.nav__brand-logo {
  display: block;
  height: 44px;
  width: auto;
  object-fit: contain;
  transition: height 300ms ease;
}
.nav.is-scrolled .nav__brand-logo { height: 36px; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}
.nav__link {
  position: relative;
  font-family: var(--ff-ui);
  font-weight: 400;
  font-size: var(--fs-sm);
  color: var(--bone);
  padding: 0.5rem 0;
  transition: color 200ms ease;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  height: 1px;
  width: 0;
  background: var(--param-cyan);
  transition: width 200ms ease;
}
.nav__link:hover::after { width: 100%; }
.nav__link:hover { color: var(--param-cyan); }

.nav__right {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.nav__location {
  font-family: var(--ff-mono);
  font-size: var(--fs-mono-xs);
  color: var(--graphite);
  letter-spacing: 0.05em;
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1.5rem;
  background: transparent;
  border: 1px solid var(--param-cyan);
  color: var(--param-cyan);
  font-family: var(--ff-ui);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background 200ms ease, color 200ms ease, box-shadow 300ms ease;
}
.nav__cta:hover {
  background: var(--param-cyan);
  color: var(--void);
  box-shadow: 0 0 24px rgba(111, 227, 210, 0.4);
}

/* Hamburger */
.nav__burger {
  display: none;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 0;
  position: relative;
  z-index: 110;
}
.nav__burger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--bone);
  margin: 5px auto;
  transition: transform 200ms ease, opacity 200ms ease;
}
.nav__burger.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile menu overlay */
.nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 11, 0.98);
  background-image:
    linear-gradient(var(--grid-line-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-strong) 1px, transparent 1px);
  background-size: 64px 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-20px);
  transition: opacity 300ms ease, transform 300ms ease;
  z-index: 105;
}
.nav__overlay.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.nav__overlay-link {
  font-family: var(--ff-display);
  font-size: 2.5rem;
  font-weight: 500;
  color: var(--bone);
  letter-spacing: -0.02em;
}
.nav__overlay-spiral {
  position: absolute;
  width: 60vmin;
  height: 60vmin;
  opacity: 0.08;
  pointer-events: none;
}

@media (max-width: 1100px) {
  .nav__links, .nav__location { display: none; }
}
@media (max-width: 720px) {
  .nav__cta { display: none; }
  .nav__burger { display: block; }
  .nav__brand-logo { height: 36px; }
}