/* Header Specific Styles */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--space-3) 0;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  position: relative;
}

/* Brand */
.brand-logo {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  z-index: 1002;
}

.text-primary {
  color: var(--color-primary);
}

/* Desktop Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--space-6);
}

.nav-link {
  font-weight: 500;
  color: var(--color-text);
  font-size: 1rem;
  padding: var(--space-2) 0;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

/* Header Actions (User/Cart) */
.header-actions {
  gap: var(--space-4);
  margin-left: var(--space-6);
}

.action-link {
  color: var(--color-text);
  font-size: 1.25rem;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.mobile-only {
  display: none;
  font-size: 1rem;
  font-weight: 500;
}

/* Mobile Toggle Button */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  z-index: 1002;
  color: var(--color-text);
}

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

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

.hamburger-icon::before {
  top: -8px;
}

.hamburger-icon::after {
  top: 8px;
}

/* Mobile Menu State */
.mobile-toggle[aria-expanded="true"] .hamburger-icon {
  background-color: transparent;
}

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

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

/* Responsive Styles */
@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 80%;
    max-width: 300px;
    background-color: var(--color-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-12) var(--space-6) var(--space-6);
    box-shadow: -4px 0 10px rgba(0,0,0,0.1);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    z-index: 1001;
  }

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

  .nav-list {
    flex-direction: column;
    width: 100%;
    gap: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-4);
  }

  .nav-link {
    display: block;
    font-size: 1.125rem;
  }

  .header-actions {
    margin-left: 0;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-4);
  }

  .mobile-only {
    display: inline-block;
  }
}