/* ── HAMBURGER NAV ── */
.nav {
  position: fixed;
  top: 1.2rem;
  right: 1.5rem;
  z-index: 200;
}

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

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--fg);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg);
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 3rem;
  gap: 1.5rem;
  z-index: 190;
}

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

.nav-menu a {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(2rem, 8vw, 3.5rem);
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.02em;
  line-height: 1;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active { opacity: 1; }