/* === HEADER === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: var(--border-width) solid var(--border-color);
}

.site-header .container {
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

/* === NAV LIST === */
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) 12px;
  font-family: var(--font-sans);
  font-size: var(--font-size-body);
  font-weight: 600;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  border: none;
  background: none;
  cursor: pointer;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-blue-50);
}

.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--color-accent);
}

.nav-list > li {
  position: relative;
}

/* === DROPDOWN === */
.nav-chevron {
  font-size: 10px;
  margin-left: 4px;
  transition: transform var(--transition);
}

.nav-dropdown.open .nav-chevron {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  padding: var(--space-1) 0;
  background: var(--color-white);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.nav-dropdown.open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.nav-dropdown-link {
  display: block;
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-body);
  font-weight: 400;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}

.nav-dropdown-link:hover {
  background: var(--color-blue-50);
  color: var(--color-primary);
}

.nav-dropdown-link.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* === MOBILE NAV TOGGLE === */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* === MOBILE MENU === */
.nav-menu {
  display: none;
}

.nav-menu.open {
  display: flex;
  position: fixed;
  inset: var(--header-height) 0 0 0;
  flex-direction: column;
  background: var(--color-white);
  padding: var(--space-4);
  overflow-y: auto;
  z-index: 99;
}

.nav-menu.open .nav-list {
  flex-direction: column;
  align-items: stretch;
  gap: 0;
}

.nav-menu.open .nav-link {
  padding: 14px var(--space-2);
  font-size: 18px;
  border-bottom: var(--border-width) solid var(--color-blue-50);
}

.nav-menu.open .nav-dropdown-menu {
  position: static;
  opacity: 1;
  visibility: visible;
  transform: none;
  border: none;
  padding-left: var(--space-3);
}

/* === DESKTOP === */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav-menu {
    display: flex;
    align-items: center;
  }
}