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

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

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

/* Brand */
.header-brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-text-primary);
  transition: opacity var(--transition-fast);
}

.brand-link:hover {
  opacity: 0.8;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

.brand-tagline {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: -2px;
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: center;
}

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

.nav-list.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  padding: var(--space-4);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--shadow-lg);
  gap: 0;
  z-index: var(--z-dropdown);
}

.nav-item {
  border-bottom: 1px solid var(--gray-100);
}

.nav-item:last-child {
  border-bottom: none;
}

.nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  border-radius: var(--radius-md);
}

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--gray-100);
}

.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  position: relative;
  text-decoration: none;
}

.action-btn:hover {
  background-color: var(--gray-100);
  color: var(--color-primary);
}

.action-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.cart-count {
  position: absolute;
  top: -2px;
  right: -2px;
  background-color: var(--color-primary);
  color: white;
  font-size: var(--text-xs);
  font-weight: 600;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-surface);
}

/* Desktop Styles */
@media (min-width: 1024px) {
  .header-container {
    height: 5rem;
  }

  .mobile-menu-toggle {
    display: none;
  }

  .nav-list {
    display: flex;
    flex-direction: row;
    position: static;
    background: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
  }

  .nav-item {
    border-bottom: none;
  }

  .nav-link {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .hamburger-line,
  .mobile-menu-toggle,
  .nav-link,
  .action-btn,
  .brand-link {
    transition: none;
  }
}