/* Header Styles */
#site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
  z-index: 1000;
  backdrop-filter: blur(5px);
  transition: background-color var(--transition-normal);
}

.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) 0;
  position: relative;
}

.logo a {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.logo a:hover {
  color: var(--color-primary-dark);
}

/* Navigation */
.main-nav {
  position: relative;
}

.nav-list {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list.active {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  right: 0;
  width: 100vw;
  background-color: white;
  box-shadow: var(--shadow-md);
  padding: var(--spacing-4);
  transform: translateX(var(--container-padding));
}

.nav-list li {
  margin-bottom: var(--spacing-2);
}

.nav-list a {
  display: block;
  padding: var(--spacing-2);
  color: var(--color-gray-700);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
}

.mobile-menu-toggle .bar {
  display: block;
  width: 24px;
  height: 3px;
  background-color: var(--color-gray-700);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

.mobile-menu-toggle.active .bar:nth-child(1) {
  transform: rotate(-45deg) translate(-5px, 6px);
}

.mobile-menu-toggle.active .bar:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active .bar:nth-child(3) {
  transform: rotate(45deg) translate(-5px, -6px);
}

/* Dropdown Menu */
.has-dropdown {
  position: relative;
}

.dropdown {
  display: none;
  list-style: none;
  margin: 0;
  padding: var(--spacing-2);
  background-color: white;
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
}

.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown {
  display: block;
}

.nav-list.active .dropdown {
  position: static;
  box-shadow: none;
  padding-left: var(--spacing-4);
}

/* Tablet and Desktop Styles */
@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
  
  .nav-list {
    display: flex;
    flex-direction: row;
    align-items: center;
  }
  
  .nav-list li {
    margin-bottom: 0;
    margin-left: var(--spacing-4);
  }
  
  .nav-list a {
    padding: var(--spacing-1) 0;
  }
  
  .dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
  }
  
  .nav-list.active {
    position: static;
    width: auto;
    background-color: transparent;
    box-shadow: none;
    padding: 0;
    transform: none;
  }
}

/* Scroll Header Effect */
#site-header.scrolled {
  background-color: white;
  box-shadow: var(--shadow-lg);
}