/* ============================================
   HEADER STYLES
   ============================================ */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  z-index: 100;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-2);
  left: var(--space-4);
  outline: none;
  box-shadow: var(--shadow-focus);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--gray-100);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-family-display);
  font-weight: 800;
  font-size: var(--font-size-xl);
  color: var(--color-text);
  flex-shrink: 0;
}

.logo__icon {
  color: var(--color-primary);
  font-size: 1.75rem;
  display: flex;
  align-items: center;
}

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

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-list a {
  font-family: var(--font-family-display);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-md);
  color: var(--color-text);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--color-primary);
  outline: none;
}

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

.header-utils {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  position: relative;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text);
  font-size: var(--font-size-lg);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.icon-btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.cart-btn {
  position: relative;
}

.cart-count {
  position: absolute;
  top: 2px;
  right: 2px;
  background-color: var(--color-primary);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-surface);
}

.mobile-menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: var(--color-text);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--color-primary-light);
}

.mobile-menu-toggle:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  position: relative;
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--transition-base);
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
  top: 0;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
    order: 1;
  }

  .main-nav {
    order: 3;
  }

  .header-utils {
    order: 2;
    margin-left: auto;
  }

  .nav-list {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6);
    gap: var(--space-2);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
  }

  .nav-list.is-open {
    transform: translateX(0);
  }

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

  .nav-list a {
    display: block;
    padding: var(--space-4) 0;
    font-size: var(--font-size-xl);
    border-bottom: 1px solid var(--gray-100);
    width: 100%;
  }

  .nav-list a::after {
    display: none;
  }

  .nav-list a:hover {
    padding-left: var(--space-2);
  }
}