/* TechMart - Demo E-commerce Store CSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --secondary: #10b981;
  --danger: #ef4444;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
  --white: #ffffff;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-100);
  color: var(--gray-800);
  line-height: 1.6;
}

/* Header & Navigation */
header {
  background: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
  text-decoration: none;
}

.search-bar {
  flex: 1;
  max-width: 400px;
  display: flex;
  gap: 0.5rem;
}

.search-bar input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  font-size: 1rem;
}

.search-bar input:focus {
  outline: none;
  border-color: var(--primary);
}

.search-bar button {
  padding: 0.75rem 1rem;
  background: var(--primary);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.cart-link {
  color: var(--gray-800);
  text-decoration: none;
  font-weight: 500;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-block;
  border: none;
  font-size: 1rem;
}

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

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

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

.btn-full {
  width: 100%;
  text-align: center;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

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

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.9;
}

/* Filters */
.filters {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 1.5rem 2rem;
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow);
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.filter-group label {
  font-weight: 500;
  color: var(--gray-600);
  font-size: 0.9rem;
}

.filter-group select,
.filter-group input[type="range"] {
  padding: 0.5rem;
  border: 2px solid var(--gray-200);
  border-radius: 6px;
  font-size: 1rem;
  min-width: 150px;
}

/* Products */
.products {
  max-width: 1200px;
  margin: 0 auto 4rem;
  padding: 0 2rem;
}

.products h2 {
  margin-bottom: 1.5rem;
  font-size: 1.75rem;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.product-image {
  aspect-ratio: 1;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.product-image img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.product-info {
  padding: 1.5rem;
}

.product-info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.product-category {
  font-size: 0.85rem;
  color: var(--gray-600);
  text-transform: capitalize;
  margin-bottom: 0.5rem;
}

.product-price {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
  margin-bottom: 1rem;
}

.product-stock {
  font-size: 0.85rem;
  color: var(--secondary);
  margin-bottom: 1rem;
}

.product-stock.low {
  color: var(--danger);
}

/* Auth Pages */
.auth-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - 200px);
  padding: 2rem;
}

.auth-container {
  background: var(--white);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
}

.auth-container h1 {
  margin-bottom: 1.5rem;
  text-align: center;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 500;
  color: var(--gray-600);
}

.form-group input,
.form-group select {
  padding: 0.875rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.error-message {
  background: #fef2f2;
  color: var(--danger);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

.auth-switch {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--gray-600);
}

.auth-switch a {
  color: var(--primary);
  font-weight: 500;
}

.demo-credentials {
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--gray-100);
  border-radius: 8px;
  font-size: 0.9rem;
}

/* Cart Page */
.cart-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.cart-page h1 {
  margin-bottom: 2rem;
}

.empty-cart {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--white);
  border-radius: 12px;
}

.empty-cart p {
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
  color: var(--gray-600);
}

.cart-content {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 2rem;
}

.cart-items {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cart-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--white);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.item-image {
  width: 100px;
  height: 100px;
  background: var(--gray-100);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.item-image img {
  max-width: 80%;
  max-height: 80%;
}

.item-details {
  flex: 1;
}

.item-details h3 {
  margin-bottom: 0.25rem;
}

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

.item-quantity {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.qty-btn {
  width: 32px;
  height: 32px;
  border: 2px solid var(--gray-200);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qty-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.qty-value {
  font-weight: 600;
  min-width: 30px;
  text-align: center;
}

.item-total {
  font-weight: bold;
  font-size: 1.1rem;
  min-width: 80px;
  text-align: right;
}

.remove-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--gray-100);
  border-radius: 6px;
  cursor: pointer;
  color: var(--gray-600);
}

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

/* Cart Summary */
.cart-summary {
  background: var(--white);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  height: fit-content;
}

.cart-summary h2 {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.summary-row.total {
  font-size: 1.25rem;
  font-weight: bold;
  padding-top: 1rem;
  margin-top: 1rem;
  border-top: 2px solid var(--gray-200);
}

.cart-summary .btn {
  margin-top: 1rem;
}

/* Checkout Page */
.checkout-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.checkout-page h1 {
  margin-bottom: 2rem;
}

.checkout-container {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 2rem;
}

.checkout-form {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.form-section {
  background: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.form-section h2 {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.order-summary-sidebar {
  background: var(--white);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  height: fit-content;
  position: sticky;
  top: 100px;
}

.order-summary-sidebar h2 {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.order-items {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.order-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
}

.summary-totals {
  border-top: 1px solid var(--gray-200);
  padding-top: 1rem;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--white);
  padding: 3rem;
  border-radius: 16px;
  text-align: center;
  max-width: 450px;
}

.modal-content h2 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.modal-content p {
  margin-bottom: 0.5rem;
  color: var(--gray-600);
}

.modal-content .btn {
  margin-top: 1.5rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--gray-800);
  color: var(--white);
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  z-index: 1001;
  animation: slideIn 0.3s ease;
}

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

/* Footer */
footer {
  background: var(--gray-800);
  color: var(--white);
  text-align: center;
  padding: 2rem;
  margin-top: auto;
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
  .navbar {
    flex-wrap: wrap;
  }
  
  .search-bar {
    order: 3;
    max-width: none;
    width: 100%;
  }
  
  .cart-content,
  .checkout-container {
    grid-template-columns: 1fr;
  }
  
  .cart-item {
    flex-wrap: wrap;
  }
}