.nav-bar {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-3);
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--font-size-md);
  color: var(--color-primary);
  text-decoration: none;
}
.brand img { height: 2.8rem; width: auto; }
.brand:hover { color: var(--color-primary-dark); }

.nav-toggle {
  display: none;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: .5em .7em;
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.main-nav a {
  display: inline-block;
  padding: .4em .2em;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 700;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover,
.main-nav li.is-active > a {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.nav-dropdown { position: relative; }
.nav-dropdown-label {
  cursor: default;
  display: inline-flex;
  align-items: center;
  gap: .3em;
  font-weight: 800;
  color: var(--color-ink);
}
.nav-dropdown-label::after { content: "▾"; font-size: .7em; }
.nav-dropdown-menu {
  list-style: none;
  margin: 0;
  padding: var(--space-1);
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 14rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lift);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity .15s ease, transform .15s ease, visibility .15s;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown-menu li a {
  display: block;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  border-bottom: none;
}
.nav-dropdown-menu li a:hover { background: var(--color-primary-tint); }

@media (max-width: 59.99rem) {
  .nav-toggle { display: inline-flex; }
  .main-nav {
    position: absolute;
    left: 0; right: 0; top: 100%;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-soft);
    display: none;
  }
  .main-nav.is-open { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; padding: var(--space-2) var(--space-3); gap: 0; }
  .main-nav li { border-bottom: 1px solid var(--color-border-soft); }
  .main-nav li:last-child { border-bottom: none; }
  .main-nav a { padding: var(--space-2) 0; }
  .nav-dropdown-menu {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: none; padding-left: var(--space-2);
    display: none;
  }
  .nav-dropdown.is-open .nav-dropdown-menu { display: block; }
}