/* CSS Variables */
:root {
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --secondary-color: #64748b;
  --accent-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --success-color: #22c55e;
  
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-dark: #1f2937;
  --border-color: #e5e7eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  --border-radius: 8px;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition: all 0.2s ease-in-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

/* Navigation */
.navbar {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-logo i {
  font-size: 28px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

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

.nav-auth {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 12px;
}

.cart-icon {
  position: relative;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.cart-icon:hover {
  background-color: var(--bg-secondary);
}

.cart-icon i {
  font-size: 20px;
  color: var(--text-secondary);
}

.cart-count {
  position: absolute;
  top: -5px;
  right: -5px;
  background: var(--danger-color);
  color: white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

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

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

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

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

.btn-large {
  padding: 14px 28px;
  font-size: 16px;
}

.btn-full {
  width: 100%;
}

.btn-social {
  background: white;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-google:hover {
  background: #db4437;
  color: white;
  border-color: #db4437;
}

.btn-github:hover {
  background: #333;
  color: white;
  border-color: #333;
}

/* Main Content */
.main-content {
  margin-top: 64px;
  min-height: calc(100vh - 64px);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, rgba(74, 144, 226, 0.9) 0%, rgba(31, 81, 255, 0.9) 100%),
              url('https://images.unsplash.com/photo-1556742049-0cfed4f6a45d?ixlib=rb-4.0.3&auto=format&fit=crop&w=2340&q=80');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: white;
  padding: 80px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(74, 144, 226, 0.8) 0%, rgba(31, 81, 255, 0.8) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-content h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero-content p {
  font-size: 20px;
  margin-bottom: 32px;
  opacity: 0.9;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  max-width: 800px;
  margin: 60px auto 0;
}

.stat-card {
  background: rgba(255, 255, 255, 0.1);
  padding: 24px;
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
}

.stat-card i {
  font-size: 32px;
  margin-bottom: 12px;
  color: white;
}

.stat-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.stat-card p {
  opacity: 0.8;
}

/* Sections */
section {
  padding: 60px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 20px;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 700;
}

.search-filter {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.search-input,
.filter-select {
  padding: 10px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 14px;
  min-width: 200px;
}

.search-input:focus,
.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Products Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.product-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(45deg, var(--bg-secondary), var(--border-color));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 48px;
  position: relative;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.product-image .placeholder-icon {
  font-size: 48px;
  color: var(--text-light);
  opacity: 0.6;
}

.product-image .category-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.product-info {
  padding: 20px;
}

.product-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.product-description {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 12px;
  line-height: 1.5;
}

.product-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.product-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
}

.product-stock {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.product-stock.in-stock {
  background: rgba(34, 197, 94, 0.1);
  color: var(--success-color);
}

.product-stock.low-stock {
  background: rgba(251, 191, 36, 0.1);
  color: #f59e0b;
}

.product-stock.out-of-stock {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
}

.product-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.product-actions .btn {
  flex: 1;
  min-width: 100px;
}

.product-actions .btn:not(.btn-primary) {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Orders */
.orders-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.order-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.order-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.order-info h3 {
  margin-bottom: 4px;
}

.order-info p {
  color: var(--text-secondary);
  font-size: 14px;
}

.order-status {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
}

.status-pending {
  background: #fef3c7;
  color: #92400e;
}

.status-processing {
  background: #dbeafe;
  color: #1e40af;
}

.status-shipped {
  background: #d1fae5;
  color: #065f46;
}

.status-delivered {
  background: #dcfce7;
  color: #166534;
}

.status-cancelled {
  background: #fee2e2;
  color: #991b1b;
}

.order-items {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.order-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
}

.order-total {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  text-align: right;
  font-weight: 600;
  font-size: 18px;
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  background-color: var(--bg-primary);
  margin: 10% auto;
  padding: 0;
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  margin: 0;
  font-size: 20px;
}

.close {
  color: var(--text-light);
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  line-height: 1;
}

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

/* Forms */
.auth-form,
.product-form {
  padding: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 14px;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.auth-divider {
  text-align: center;
  margin: 24px 0;
  position: relative;
}

.auth-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border-color);
}

.auth-divider span {
  background: var(--bg-primary);
  padding: 0 16px;
  color: var(--text-light);
}

.social-auth {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Cart Sidebar */
.cart-sidebar {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background: var(--bg-primary);
  box-shadow: var(--shadow-lg);
  z-index: 1500;
  transition: right 0.3s ease-in-out;
  display: flex;
  flex-direction: column;
}

.cart-sidebar.open {
  right: 0;
}

.cart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}

.close-btn {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-light);
}

.cart-items {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.cart-item-info h4 {
  margin: 0 0 4px 0;
  font-size: 14px;
}

.cart-item-info p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 12px;
}

.cart-item-price {
  font-weight: 600;
  color: var(--primary-color);
}

.cart-footer {
  padding: 20px;
  border-top: 1px solid var(--border-color);
}

.cart-total {
  margin-bottom: 16px;
  text-align: center;
  font-size: 18px;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 3000;
}

.toast {
  background: var(--bg-primary);
  border-left: 4px solid var(--success-color);
  box-shadow: var(--shadow-lg);
  padding: 16px 20px;
  margin-bottom: 12px;
  border-radius: var(--border-radius);
  animation: toastSlideIn 0.3s ease-out;
  min-width: 300px;
}

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

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

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Loading States */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px;
  color: var(--text-secondary);
}

.loading i {
  font-size: 20px;
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 3000;
  color: white;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Footer */
.footer {
  background: var(--bg-dark);
  color: white;
  padding: 40px 20px 20px;
  margin-top: 60px;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
}

.footer-section h4 {
  margin-bottom: 16px;
  color: white;
}

.footer-section p {
  color: #9ca3af;
  line-height: 1.6;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 8px;
}

.footer-section ul li a {
  color: #9ca3af;
  text-decoration: none;
  transition: var(--transition);
}

.footer-section ul li a:hover {
  color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 16px;
  }
  
  .nav-menu {
    gap: 16px;
  }
  
  .hero-content h1 {
    font-size: 32px;
  }
  
  .hero-content p {
    font-size: 16px;
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .search-filter {
    width: 100%;
    flex-direction: column;
  }
  
  .search-input,
  .filter-select {
    width: 100%;
    min-width: unset;
  }
  
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
  }
  
  .cart-sidebar {
    width: 100vw;
    right: -100vw;
  }
  
  .modal-content {
    width: 95%;
    margin: 5% auto;
  }
  
  .btn {
    padding: 12px 16px;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-auth {
    flex-direction: column;
    gap: 8px;
  }
}