/* ModernShop - Main Stylesheet */
/* Implementing 2024-2025 E-commerce Design Trends */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* CSS Custom Properties for Design System */
:root {
  /* Color Palette - High Contrast Design Trend */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #7c3aed;
  --color-secondary-dark: #6d28d9;
  --color-accent: #f59e0b;
  --color-accent-dark: #d97706;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  /* Neutral Colors */
  --color-dark: #1f2937;
  --color-dark-light: #374151;
  --color-gray: #6b7280;
  --color-gray-light: #9ca3af;
  --color-light: #f8fafc;
  --color-white: #ffffff;
  
  /* Typography - Minimum 16px for mobile legibility */
  --font-family-primary: 'Inter', system-ui, -apple-system, 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;
  
  /* Line Height - 1.5x for improved readability */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing System */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius - Modern rounded corners */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows - Sophisticated depth */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions - Smooth micro-animations */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px; /* Minimum font size for mobile legibility */
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-dark);
  background-color: var(--color-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility - Screen Reader Only Content */
.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;
}

.sr-only:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Focus Styles for Accessibility */
*:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus,
a:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Typography Styles */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-normal);
}

/* Button Styles - Modern Interactive Elements */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translateY(0);
}

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

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

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

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

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-dark);
}

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

/* Navigation Styles */
.nav-link {
  position: relative;
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-normal);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

/* Card Styles - Modern Card Design */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid #e5e7eb;
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid #e5e7eb;
  background-color: var(--color-light);
}

/* Product Card Styles */
.product-card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
  position: relative;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.product-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--color-light);
}

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

.product-card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
}

.product-card-price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.product-card-rating {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.product-card-rating .stars {
  color: var(--color-accent);
  margin-right: var(--spacing-sm);
}

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

/* Category Card Styles */
.category-card {
  text-align: center;
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  cursor: pointer;
}

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

/* Feature Card Styles */
.feature-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.feature-card h3 {
  color: var(--color-dark);
  margin-bottom: var(--spacing-md);
}

.feature-card p {
  color: var(--color-gray);
  line-height: var(--line-height-relaxed);
}

/* Filter Button Styles */
.filter-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
}

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

.filter-btn:not(.active) {
  background-color: #e5e7eb;
  color: var(--color-dark);
}

.filter-btn:not(.active):hover {
  background-color: #d1d5db;
}

/* Shopping Cart Styles */
.cart-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  border-bottom: 1px solid #e5e7eb;
}

.cart-item-image {
  width: 60px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-right: var(--spacing-md);
}

.cart-item-details {
  flex: 1;
}

.cart-item-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

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

.cart-item-quantity {
  display: flex;
  align-items: center;
  margin-top: var(--spacing-sm);
}

.quantity-btn {
  width: 32px;
  height: 32px;
  border: 1px solid #d1d5db;
  background-color: var(--color-white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quantity-btn:hover {
  background-color: var(--color-light);
}

.quantity-input {
  width: 60px;
  text-align: center;
  border: 1px solid #d1d5db;
  border-left: none;
  border-right: none;
  padding: var(--spacing-xs);
  font-weight: 600;
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}

/* Form Styles */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
}

.form-input {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid #d1d5db;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  transition: all var(--transition-normal);
}

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

/* Animation Classes - Sophisticated Micro-Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.3s ease-out;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

/* Utility Classes */
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bg-gradient-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
}

.bg-gradient-secondary {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
}

/* Loading States */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #0000ff;
    --color-secondary: #800080;
    --color-dark: #000000;
    --color-light: #ffffff;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print Styles */
@media print {
  .no-print {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .card {
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
}