.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.5rem clamp(1.25rem, 4vw, 3rem);
  background: transparent;
  transition: background 400ms var(--ease-arch),
              padding 400ms var(--ease-arch),
              box-shadow 400ms var(--ease-arch);
}

.nav.is-scrolled {
  background: rgba(244, 240, 232, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0.75rem clamp(1.25rem, 4vw, 3rem);
  box-shadow: 0 1px 0 rgba(26,26,24,.06);
}

.nav__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--sp-4);
  max-width: var(--container-ultra);
  margin: 0 auto;
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.nav__logo-img {
  width: auto;
  height: 48px;
  display: block;
  object-fit: contain;
  transition: height 400ms var(--ease-arch);
}

.nav.is-scrolled .nav__logo-img {
  height: 38px;
}

@media (max-width: 899px) {
  .nav__logo-img { height: 42px; }
  .nav.is-scrolled .nav__logo-img { height: 34px; }
}

.nav__links {
  display: none;
  justify-self: center;
  gap: var(--sp-4);
  align-items: center;
}

.nav__link {
  position: relative;
  font-family: var(--ff-body);
  font-weight: 400;
  font-size: var(--fs-sm);
  color: var(--shadow-ink);
  padding: 0.5rem 0;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 100%;
  background: var(--aida-green);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 300ms var(--ease-arch);
}

.nav__link:hover {
  color: var(--aida-green);
}

.nav__link:hover::after {
  transform: scaleX(1);
}

.nav__cta {
  padding: 0.7rem 1.4rem;
  font-family: var(--ff-body);
  font-weight: 500;
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--aida-green);
  border: 1px solid var(--aida-green);
  border-radius: 2px;
  transition: all 300ms var(--ease-arch);
}

.nav__cta:hover {
  background: var(--aida-green);
  color: var(--bone);
}

/* Mobile burger */
.nav__burger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 6px;
  background: transparent;
  border: none;
  z-index: 2000;
}

.nav__burger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--shadow-ink);
  transition: transform 350ms var(--ease-arch),
              opacity 200ms var(--ease-arch);
  transform-origin: center;
}

.nav.is-open .nav__burger span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.nav.is-open .nav__burger span:nth-child(2) {
  opacity: 0;
}

.nav.is-open .nav__burger span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* Mobile menu overlay */
.nav__menu {
  position: fixed;
  inset: 0;
  background: var(--bone-warm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  opacity: 0;
  visibility: hidden;
  transition: opacity 400ms var(--ease-arch), visibility 400ms;
  z-index: 1500;
  padding: var(--sp-8) var(--sp-3);
}

.nav.is-open .nav__menu {
  opacity: 1;
  visibility: visible;
}

.nav__menu-link {
  font-family: var(--ff-display);
  font-size: clamp(2.2rem, 7vw, 3.4rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--shadow-ink);
  line-height: 1.1;
  position: relative;
}

.nav__menu-link:hover {
  color: var(--aida-green);
}

.nav__menu-mark {
  margin-top: var(--sp-6);
  width: 60px;
  height: 60px;
  border: 1.5px solid var(--aida-green);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--ff-display);
  font-size: 2rem;
  color: var(--aida-green);
}

.nav__menu-meta {
  font-family: var(--ff-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--charcoal);
  text-align: center;
  margin-top: var(--sp-2);
}

@media (min-width: 900px) {
  .nav__links { display: inline-flex; }
  .nav__burger { display: none; }
  .nav__menu { display: none; }
}

@media (max-width: 899px) {
  .nav__cta { display: none; }
}