/* Header Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background-color: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-800);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.logo__icon {
  color: var(--color-primary);
  font-size: var(--text-2xl);
}

.logo__text {
  letter-spacing: -0.025em;
}

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

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

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--duration-200) var(--ease-in-out);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--duration-300) var(--ease-out);
}

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

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

.cart-link {
  position: relative;
}

.cart-count {
  position: absolute;
  top: -4px;
  right: -4px;
  background-color: var(--color-primary);
  color: var(--color-bg);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-full);
  min-width: 1.25rem;
  text-align: center;
  display: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none !important;
  background: transparent;
  border: none;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  color: var(--color-text);
  margin-left: auto;
  z-index: 101;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 48px;
  border-radius: var(--radius-md);
  transition: background-color 200ms ease;
}

.mobile-menu-toggle:hover {
  background-color: rgba(var(--color-primary-rgb), 0.08);
}

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

.mobile-menu-toggle:active {
  background-color: rgba(var(--color-primary-rgb), 0.12);
}

.hamburger {
  width: 24px;
  height: 3px;
  background-color: currentColor;
  border-radius: 2px;
  position: relative;
  transition: background-color 300ms cubic-bezier(0.4, 0, 0.2, 1);
  display: block;
}

.hamburger::before {
  content: '';
  width: 24px;
  height: 3px;
  background-color: currentColor;
  border-radius: 2px;
  position: absolute;
  top: -8px;
  left: 0;
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1),
              top 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.hamburger::after {
  content: '';
  width: 24px;
  height: 3px;
  background-color: currentColor;
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 0;
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1),
              top 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

body.menu-open {
  overflow: hidden;
}

/* Responsive */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex !important;
    align-items: center;
    justify-content: center;
    margin-left: var(--space-2);
  }
  
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-bg);
    padding: var(--space-8) var(--space-6) var(--space-6);
    transform: translateX(-100%);
    transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    overflow-x: hidden;
    border-top: 1px solid var(--gray-800);
    z-index: 100;
    will-change: transform;
    -webkit-overflow-scrolling: touch;
  }
  
  .main-nav.is-open {
    transform: translateX(0);
    box-shadow: inset 1px 0 0 rgba(255, 255, 255, 0.05);
  }
  
  .nav-list {
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }
  
  .nav-link {
    font-size: var(--text-base);
    font-weight: 500;
    padding: var(--space-4) var(--space-3);
    width: 100%;
    border-bottom: 1px solid var(--gray-800);
    display: block;
    color: var(--color-text);
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  .nav-link:active,
  .nav-link:hover {
    background-color: rgba(var(--color-primary-rgb), 0.08);
    padding-left: var(--space-4);
    color: var(--color-primary);
  }
  
  .nav-link::after {
    display: none;
  }
  
  .header-container {
    gap: var(--space-2);
  }
  
  .header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-left: auto;
  }
  
  .search-toggle {
    display: flex;
  }
}

@media (max-width: 480px) {
  .mobile-menu-toggle {
    padding: var(--space-1) var(--space-2);
    min-width: 44px;
    min-height: 44px;
  }
  
  .logo__text {
    display: none;
  }
  
  .logo {
    gap: var(--space-1);
  }
}