/* Header Styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), 
              box-shadow var(--transition-normal);
  padding: var(--space-2) 0;
}

.header.scrolled {
  background-color: white;
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  transition: color var(--transition-normal);
}

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

.nav {
  display: flex;
}

.nav-list {
  display: flex;
  gap: var(--space-4);
}

.nav-list li a {
  font-weight: 500;
  color: var(--color-gray-700);
  transition: color var(--transition-normal);
  position: relative;
}

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

.nav-list li a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
}

.nav-list li a:hover::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 20px;
  cursor: pointer;
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-gray-800);
  transition: transform var(--transition-normal), 
              opacity var(--transition-normal);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  top: 60px;
  left: 0;
  width: 100%;
  background-color: white;
  box-shadow: var(--shadow-md);
  padding: var(--space-2) 0;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-normal),
              opacity var(--transition-normal),
              visibility var(--transition-normal);
  z-index: 999;
}

.mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.mobile-menu ul li a {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-gray-800);
  transition: color var(--transition-normal);
}

.mobile-menu ul li a:hover {
  color: var(--color-primary);
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
}