/* CSS Custom Properties (Design Tokens) */
:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-secondary: #64748b;
  --color-accent: #f59e0b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: #ffffff;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

input, textarea {
  font-family: inherit;
  border: none;
  outline: none;
}

/* Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--spacing-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-8);
  }
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-gray-200);
  transition: var(--transition-normal);
}

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

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-weight: 700;
  font-size: var(--font-size-xl);
  color: var(--color-gray-900);
  transition: var(--transition-fast);
}

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

.logo-icon {
  width: 2rem;
  height: 2rem;
  background-color: var(--color-primary);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: var(--font-size-lg);
}

.logo-text {
  font-weight: 700;
}

/* Desktop Navigation */
.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--spacing-6);
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
}

.nav-link {
  font-weight: 500;
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  transition: var(--transition-fast);
  position: relative;
}

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

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

/* Search Container */
.search-container {
  display: none;
  flex: 1;
  max-width: 28rem;
  margin: 0 var(--spacing-8);
}

@media (min-width: 768px) {
  .search-container {
    display: block;
  }
}

.search-box {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: var(--spacing-3);
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  color: var(--color-gray-400);
}

.search-input {
  width: 100%;
  padding: var(--spacing-2) var(--spacing-2) var(--spacing-2) 2.5rem;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-sm);
  transition: var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.action-btn {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-lg);
  color: var(--color-gray-600);
  transition: var(--transition-fast);
  position: relative;
}

.action-btn:hover {
  background-color: var(--color-gray-100);
  color: var(--color-gray-900);
}

.action-btn svg {
  width: 1rem;
  height: 1rem;
}

.cart-badge {
  position: absolute;
  top: -0.25rem;
  right: -0.25rem;
  background-color: var(--color-primary);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: 50%;
  width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--border-radius-lg);
  color: var(--color-gray-600);
  transition: var(--transition-fast);
}

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

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

.mobile-menu-toggle svg {
  width: 1rem;
  height: 1rem;
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  border-top: 1px solid var(--color-gray-200);
  background-color: white;
  padding: var(--spacing-4) 0;
}

.mobile-menu.active {
  display: block;
}

.mobile-search {
  margin-bottom: var(--spacing-4);
}

.nav-mobile {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.nav-mobile .nav-link {
  padding: var(--spacing-2) 0;
  font-weight: 500;
  color: var(--color-gray-600);
  transition: var(--transition-fast);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--border-radius-lg);
  font-weight: 600;
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  min-height: 44px; /* Touch target */
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: white;
  color: var(--color-gray-700);
  border-color: var(--color-gray-300);
}

.btn-secondary:hover {
  background-color: var(--color-gray-50);
  border-color: var(--color-gray-400);
}

.btn-small {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #f0f9ff 0%, #ffffff 50%, #f0f9ff 100%);
  padding: var(--spacing-20) 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-12);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-text {
  max-width: 36rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  background-color: #dbeafe;
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: 9999px;
  margin-bottom: var(--spacing-4);
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
  letter-spacing: -0.025em;
}

@media (min-width: 640px) {
  .hero-title {
    font-size: var(--font-size-6xl);
  }
}

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

.hero-description {
  font-size: var(--font-size-xl);
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-8);
  max-width: 32rem;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-8);
}

@media (min-width: 640px) {
  .hero-buttons {
    flex-direction: row;
  }
}

.hero-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-8);
  padding-top: var(--spacing-8);
}

.feature {
  text-align: center;
}

.feature-icon {
  width: 2rem;
  height: 2rem;
  margin: 0 auto var(--spacing-2);
  color: var(--color-primary);
}

.feature h3 {
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-1);
}

.feature p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

/* Hero Image */
.hero-image {
  position: relative;
}

.hero-image-container {
  aspect-ratio: 1;
  position: relative;
  border-radius: var(--border-radius-2xl);
  overflow: hidden;
  background-color: var(--color-gray-100);
}

.hero-image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-stats {
  position: absolute;
  bottom: -1.5rem;
  left: -1.5rem;
  background-color: white;
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-gray-200);
}

.hero-stats {
  display: flex;
  gap: var(--spacing-4);
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

/* Section Styles */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-12);
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  background-color: var(--color-gray-100);
  color: var(--color-gray-800);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: 9999px;
  margin-bottom: var(--spacing-4);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
  letter-spacing: -0.025em;
}

@media (min-width: 640px) {
  .section-title {
    font-size: var(--font-size-4xl);
  }
}

.section-description {
  font-size: var(--font-size-xl);
  color: var(--color-gray-600);
  line-height: 1.6;
}

.section-footer {
  text-align: center;
  margin-top: var(--spacing-12);
}

/* Featured Products */
.featured-products {
  padding: var(--spacing-20) 0;
}

.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}

@media (min-width: 640px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.product-card {
  background-color: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
  group: hover;
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.product-image {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  background-color: var(--color-gray-100);
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-badge {
  position: absolute;
  top: var(--spacing-2);
  left: var(--spacing-2);
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: 9999px;
}

.badge-bestseller {
  background-color: #dbeafe;
  color: var(--color-primary);
}

.badge-new {
  background-color: #dcfce7;
  color: #16a34a;
}

.badge-sale {
  background-color: #fee2e2;
  color: #dc2626;
}

.badge-limited {
  background-color: #fef3c7;
  color: #d97706;
}

.product-content {
  padding: var(--spacing-4);
}

.product-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-3);
}

.product-rating {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-3);
}

.stars {
  display: flex;
  gap: 1px;
}

.star {
  font-size: var(--font-size-sm);
  color: var(--color-gray-300);
}

.star.filled {
  color: #fbbf24;
}

.rating-text {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

.product-price {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-4);
}

.price-current {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-gray-900);
}

.price-original {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  text-decoration: line-through;
}

/* Categories */
.categories {
  padding: var(--spacing-20) 0;
  background-color: var(--color-gray-50);
}

.categories-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}

@media (min-width: 640px) {
  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .categories-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.category-card {
  background-color: white;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
  cursor: pointer;
}

.category-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.category-card img {
  width: 100%;
  height: 12rem;
  object-fit: cover;
}

.category-content {
  padding: var(--spacing-6);
}

.category-content h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-2);
}

.category-content p {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-3);
}

.category-count {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  font-weight: 500;
}

/* About Section */
.about {
  padding: var(--spacing-20) 0;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-12);
  align-items: center;
}

@media (min-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr 1fr;
  }
}

.about-text {
  max-width: 36rem;
}

.about-description {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: var(--spacing-8);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

.about-image img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-xl);
}

/* Contact Section */
.contact {
  padding: var(--spacing-20) 0;
  background-color: var(--color-gray-50);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-12);
}

@media (min-width: 1024px) {
  .contact-content {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-info {
  max-width: 36rem;
}

.contact-description {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-8);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-4);
}

.contact-icon {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-primary);
  margin-top: var(--spacing-1);
  flex-shrink: 0;
}

.contact-item h4 {
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-1);
}

.contact-item p {
  color: var(--color-gray-600);
}

/* Contact Form */
.contact-form {
  background-color: white;
  padding: var(--spacing-8);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
}

.contact-form h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-6);
}

.form-group {
  margin-bottom: var(--spacing-6);
}

.form-group label {
  display: block;
  font-weight: 500;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-2);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-3);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 7rem;
}

/* Footer */
.footer {
  background-color: var(--color-gray-50);
  border-top: 1px solid var(--color-gray-200);
  padding: var(--spacing-12) 0 var(--spacing-8);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
}

@media (min-width: 640px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-content {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-section h3 {
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

.footer-description {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-4);
  line-height: 1.6;
}

.social-links {
  display: flex;
  gap: var(--spacing-4);
}

.social-link {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-400);
  transition: var(--transition-fast);
}

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

.social-link svg {
  width: 1rem;
  height: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.footer-links a {
  color: var(--color-gray-600);
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.contact-info-footer p {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-2);
}

.footer-bottom {
  margin-top: var(--spacing-8);
  padding-top: var(--spacing-8);
  border-top: 1px solid var(--color-gray-200);
  text-align: center;
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* Focus Styles */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-gray-300: #000000;
    --color-gray-600: #000000;
    --color-gray-800: #000000;
  }
}

/* Print Styles */
@media print {
  .header,
  .mobile-menu-toggle,
  .action-btn,
  .btn {
    display: none !important;
  }
  
  .hero {
    padding: var(--spacing-8) 0;
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
}

/* Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Loading States */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1rem;
  height: 1rem;
  margin: -0.5rem 0 0 -0.5rem;
  border: 2px solid var(--color-gray-300);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* JavaScript-Enhanced Styles */

/* Header scroll effects */
.header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

.header {
  transition: transform var(--transition-normal), background-color var(--transition-normal);
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  width: 3rem;
  height: 3rem;
  background-color: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem);
  transition: var(--transition-normal);
  z-index: 40;
  border: none;
  cursor: pointer;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* Notification system */
.notification {
  position: fixed;
  top: var(--spacing-4);
  right: var(--spacing-4);
  background-color: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-4);
  max-width: 24rem;
  z-index: 50;
  opacity: 0;
  transform: translateY(-100%);
  transition: var(--transition-normal);
}

.notification-success {
  border-left-color: var(--color-success);
}

.notification-error {
  border-left-color: var(--color-error);
}

.notification-warning {
  border-left-color: var(--color-warning);
}

.notification-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-3);
}

.notification-message {
  color: var(--color-gray-800);
  font-weight: 500;
}

.notification-close {
  background: none;
  border: none;
  color: var(--color-gray-400);
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: 0;
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
}

.notification-close:hover {
  background-color: var(--color-gray-100);
  color: var(--color-gray-600);
}

/* Form validation styles */
.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.field-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-1);
  display: block;
}

/* Button states */
.btn-success {
  background-color: var(--color-success) !important;
  border-color: var(--color-success) !important;
}

.btn-success:hover {
  background-color: #059669 !important;
  border-color: #059669 !important;
}

/* Tooltip styles */
.tooltip {
  position: absolute;
  background-color: var(--color-gray-900);
  color: white;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  z-index: 60;
  opacity: 0;
  transform: translateY(0.5rem);
  transition: var(--transition-fast);
  pointer-events: none;
}

.tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

.tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--color-gray-900);
}

/* Animation classes */
.animate-in {
  animation: fadeInUp 0.6s ease-out forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(2rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Focus styles for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--border-radius-md);
  z-index: 100;
}

.skip-link:focus {
  top: 6px;
}

/* Enhanced mobile menu styles */
.mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-in-out;
}

.mobile-menu.active {
  max-height: 500px;
}

/* Product card hover effects */
.product-card {
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.product-card:hover::before {
  left: 100%;
}

/* Loading states */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

.spinner {
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--color-gray-300);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Enhanced accessibility */
@media (prefers-reduced-motion: reduce) {
  .animate-in {
    animation: none;
  }
  
  .notification {
    transition: none;
  }
  
  .mobile-menu {
    transition: none;
  }
}

/* High contrast mode enhancements */
@media (prefers-contrast: high) {
  .notification {
    border: 2px solid var(--color-gray-900);
  }
  
  .tooltip {
    border: 1px solid white;
  }
}

/* Print optimizations */
@media print {
  .back-to-top,
  .notification,
  .mobile-menu-toggle,
  .action-btn {
    display: none !important;
  }
}