nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  background: var(--ink);
  border-bottom: 1px solid rgba(247,243,238,0.12);
}

.nav-logo {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--warm-white);
  text-decoration: none;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--warm-white);
  transition: transform 0.25s, opacity 0.25s;
}

nav.nav-open .nav-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
nav.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
nav.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-links {
  display: flex;
  flex-direction: column;
  list-style: none;
  width: 100%;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  padding: 0;
  margin-top: 0;
  border-top: 1px solid transparent;
  pointer-events: none;
  transition: max-height 0.4s ease, opacity 0.3s ease, padding 0.4s ease, margin-top 0.4s ease, border-color 0.35s ease;
}

nav.nav-open .nav-links {
  max-height: 320px;
  opacity: 1;
  padding: 1rem 0 1.5rem;
  margin-top: 1rem;
  border-top-color: rgba(247,243,238,0.12);
  pointer-events: auto;
}

.nav-links a {
  display: block;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(247,243,238,0.65);
  text-decoration: none;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(247,243,238,0.12);
  transition: color 0.2s;
}

.nav-links li:last-child a { border-bottom: none; }

.nav-links a:hover, .nav-links a.active { color: var(--warm-white); }

@media (min-width: 768px) {
  nav { flex-wrap: nowrap; padding: 1.25rem 3rem; }
  .nav-toggle { display: none; }
  .nav-links { flex-direction: row; width: auto; gap: 2.5rem; max-height: none; opacity: 1; padding: 0; border-top: none; margin-top: 0; pointer-events: auto; overflow: visible; transition: none; }
  .nav-links a { display: inline; padding: 0; border-bottom: none; font-size: 0.75rem; }
}