header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(250, 244, 236, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow var(--fast) var(--ease);
}

header.scrolled {
  box-shadow: 0 8px 24px -18px rgba(54, 43, 34, 0.5);
}

.navbar {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
  height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  height: 40px;
  width: auto;
  transition: transform var(--fast) var(--ease);
}

.navbar > a:hover .logo {
  transform: scale(1.04);
}

#nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
  font-size: 15px;
  color: var(--ink-soft);
}

#nav-links li {
  position: relative;
}

#nav-links a {
  position: relative;
  padding-bottom: 4px;
  transition: color var(--fast) var(--ease);
}

#nav-links a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--gold-deep);
  transition: width var(--fast) var(--ease), left var(--fast) var(--ease);
}

#nav-links a:hover {
  color: var(--ink);
}

#nav-links a:hover::after,
#nav-links a.current::after {
  width: 100%;
  left: 0;
}

#nav-links a.current {
  color: var(--gold-deep);
}

.btn-mobile {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--ink);
}

.btn-mobile i {
  transition: transform var(--fast) var(--ease);
  display: inline-block;
}

.btn-mobile:hover i {
  transform: rotate(90deg);
}

@media (max-width: 860px) {
  .navbar {
    padding: 0 24px;
    height: 72px;
  }

  #nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--cream);
    flex-direction: column;
    gap: 0;
    display: none;
    border-bottom: 1px solid var(--line);
  }

  #nav-links.show {
    display: flex;
  }

  #nav-links li {
    padding: 16px 24px;
    border-top: 1px solid var(--line);
    opacity: 0;
    transform: translateY(-6px);
    animation: dropIn var(--fast) var(--ease) forwards;
  }

  #nav-links.show li:nth-child(1) { animation-delay: .04s; }
  #nav-links.show li:nth-child(2) { animation-delay: .09s; }
  #nav-links.show li:nth-child(3) { animation-delay: .14s; }
  #nav-links.show li:nth-child(4) { animation-delay: .19s; }

  @keyframes dropIn {
    to { opacity: 1; transform: translateY(0); }
  }

  #nav-links a::after {
    display: none;
  }

  .btn-mobile {
    display: block;
  }
}

@media (max-width: 520px) {
  .navbar > a.btn-default {
    display: none;
  }
}