/* UdyamSales - Mobile-First Responsive CSS Framework */

/* CSS Variables for Theme Support */
:root {
  /* Light Theme Colors */
  --primary-color: #007bff;
  --primary-dark: #0056b3;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-dark: #343a40;
  
  /* Text Colors */
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #868e96;
  --text-white: #ffffff;
  
  /* Border Colors */
  --border-color: #dee2e6;
  --border-light: #e9ecef;
  
  /* Shadow */
  --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 3rem;
  
  /* Border Radius */
  --border-radius: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 1rem;
  
  /* Transitions */
  --transition: all 0.3s ease;
  --transition-fast: all 0.15s ease;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-dark: #000000;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #888888;
  --border-color: #404040;
  --border-light: #333333;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: var(--transition);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
}

/* Container System */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-md);
}

/* Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -var(--spacing-sm);
}

.col {
  flex: 1;
  padding: 0 var(--spacing-sm);
}

.col-12 { width: 100%; }
.col-6 { width: 50%; }
.col-4 { width: 33.333333%; }
.col-3 { width: 25%; }

/* Mobile-First Responsive Columns */
@media (min-width: 768px) {
  .col-md-12 { width: 100%; }
  .col-md-6 { width: 50%; }
  .col-md-4 { width: 33.333333%; }
  .col-md-3 { width: 25%; }
}

@media (min-width: 992px) {
  .col-lg-12 { width: 100%; }
  .col-lg-6 { width: 50%; }
  .col-lg-4 { width: 33.333333%; }
  .col-lg-3 { width: 25%; }
}

/* Mobile App-Style Components */
.mobile-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.mobile-header .logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

.mobile-header .menu-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-primary);
  cursor: pointer;
}

/* Bottom Navigation (Mobile) */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  padding: var(--spacing-xs);
  min-width: 60px;
}

.bottom-nav-item.active,
.bottom-nav-item:hover {
  color: var(--primary-color);
}

.bottom-nav-item i {
  font-size: 1.2rem;
  margin-bottom: 2px;
}

.bottom-nav-item span {
  font-size: 0.75rem;
  font-weight: 500;
}

.bottom-nav-badge {
  position: absolute;
  top: -2px;
  right: 8px;
  background: var(--danger-color);
  color: white;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Desktop Navigation */
.desktop-nav {
  display: none;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.navbar-brand {
  font-size: 1.75rem;
  font-weight: bold;
  color: var(--primary-color);
}

.navbar-nav {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0 var(--spacing-md);
}

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  transition: var(--transition-fast);
}

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

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* Cards */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
}

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

.card-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

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

.card-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.card-img-top {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

/* Product Cards */
.product-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  margin-bottom: var(--spacing-md);
}

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

.product-image {
  position: relative;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: var(--transition);
}

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

.product-badge {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  background: var(--danger-color);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: 0.75rem;
  font-weight: 600;
}

.product-info {
  padding: var(--spacing-md);
}

.product-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.product-price {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.price-current {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--primary-color);
}

.price-original {
  font-size: 1rem;
  color: var(--text-muted);
  text-decoration: line-through;
}

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

.stars {
  color: #ffc107;
}

.rating-count {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-fast);
  min-height: 44px; /* Touch-friendly */
}

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

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

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

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

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

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

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

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.875rem;
  min-height: 36px;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1.125rem;
  min-height: 52px;
}

.btn-block {
  width: 100%;
}

.btn-icon {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

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

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition-fast);
  min-height: 44px; /* Touch-friendly */
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m1 6 7 7 7-7'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right var(--spacing-sm) center;
  background-size: 16px 12px;
  padding-right: 2.5rem;
}

/* Search Bar */
.search-container {
  position: relative;
  margin-bottom: var(--spacing-md);
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 3rem;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  font-size: 1rem;
  background: var(--bg-secondary);
  transition: var(--transition-fast);
}

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

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* Filters */
.filters {
  background: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
}

.filter-group {
  margin-bottom: var(--spacing-md);
}

.filter-title {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.filter-chip {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.filter-chip:hover,
.filter-chip.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
  margin-top: 60px; /* Account for mobile header */
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

/* Sections */
.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

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

.cart-item-image {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--border-radius);
  margin-right: var(--spacing-md);
}

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

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

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

.quantity-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-sm) 0;
}

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

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

.quantity-input {
  width: 60px;
  text-align: center;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-xs);
}

/* Alerts */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid;
}

.alert-success {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success-color);
  border-color: var(--success-color);
}

.alert-danger {
  background: rgba(220, 53, 69, 0.1);
  color: var(--danger-color);
  border-color: var(--danger-color);
}

.alert-warning {
  background: rgba(255, 193, 7, 0.1);
  color: var(--warning-color);
  border-color: var(--warning-color);
}

.alert-info {
  background: rgba(23, 162, 184, 0.1);
  color: var(--info-color);
  border-color: var(--info-color);
}

/* Loading States */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-light);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition-fast);
}

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

/* Responsive Design */
@media (min-width: 768px) {
  .mobile-header,
  .bottom-nav {
    display: none;
  }
  
  .desktop-nav {
    display: block;
  }
  
  .hero {
    margin-top: 0;
    padding: 6rem 0;
  }
  
  .hero h1 {
    font-size: 3.5rem;
  }
  
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cart-item-image {
    width: 100px;
    height: 100px;
  }
}

@media (min-width: 992px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .filters {
    position: sticky;
    top: 100px;
  }
}

@media (min-width: 1200px) {
  .product-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Print Styles */
@media print {
  .mobile-header,
  .bottom-nav,
  .desktop-nav,
  .btn,
  .filters {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
}