/* ==========================================================================
   TRENDING ZONE - Professional CSS Framework v3.1.0
   Optimized for E-commerce, SEO & Business Performance
   ========================================================================== */

/* ==========================================================================
   1. CSS Reset & Base Styles (Enhanced)
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 88px; /* Account for fixed header */
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   2. Enhanced CSS Variables (Professional Business Design System)
   ========================================================================== */
:root {
  /* Primary Brand Colors */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;
  --primary: var(--primary-600);
  --primary-dark: var(--primary-700);
  --primary-light: var(--primary-100);
  
  /* Secondary Colors (Accent) */
  --secondary-50: #fef2f2;
  --secondary-100: #fee2e2;
  --secondary-200: #fecaca;
  --secondary-300: #fca5a5;
  --secondary-400: #f87171;
  --secondary-500: #ef4444;
  --secondary-600: #dc2626;
  --secondary-700: #b91c1c;
  --secondary-800: #991b1b;
  --secondary-900: #7f1d1d;
  --secondary: var(--secondary-500);
  --secondary-dark: var(--secondary-700);
  
  /* Success Colors */
  --success-50: #f0fdf4;
  --success-100: #dcfce7;
  --success-200: #bbf7d0;
  --success-300: #86efac;
  --success-400: #4ade80;
  --success-500: #22c55e;
  --success-600: #16a34a;
  --success-700: #15803d;
  --success-800: #166534;
  --success-900: #14532d;
  
  /* Warning Colors */
  --warning-50: #fffbeb;
  --warning-100: #fef3c7;
  --warning-200: #fde68a;
  --warning-300: #fcd34d;
  --warning-400: #fbbf24;
  --warning-500: #f59e0b;
  --warning-600: #d97706;
  --warning-700: #b45309;
  --warning-800: #92400e;
  --warning-900: #78350f;
  
  /* Neutral Colors (Business Gradients) */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Semantic Colors */
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-600);
  --text-muted: var(--gray-500);
  --text-inverse: #ffffff;
  --text-success: var(--success-600);
  --text-warning: var(--warning-600);
  --text-danger: var(--secondary-600);
  
  --bg-primary: #ffffff;
  --bg-secondary: var(--gray-50);
  --bg-tertiary: var(--gray-100);
  --bg-dark: var(--gray-900);
  --bg-card: #ffffff;
  --bg-overlay: rgba(0, 0, 0, 0.5);
  
  --border-color: var(--gray-200);
  --border-color-light: var(--gray-100);
  --border-color-dark: var(--gray-300);
  
  /* Border Radius (Consistent Scale) */
  --border-radius-xs: 4px;
  --border-radius-sm: 8px;
  --border-radius: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 20px;
  --border-radius-2xl: 24px;
  --border-radius-full: 9999px;
  
  /* Professional Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --shadow-primary: 0 4px 20px rgba(59, 130, 246, 0.15);
  
  /* Spacing Scale (8px grid) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */
  --space-32: 8rem;    /* 128px */
  
  /* Typography System */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: 'Georgia', 'Times New Roman', serif;
  --font-mono: 'SF Mono', 'Roboto Mono', monospace;
  
  /* Font Sizes (Modular Scale) */
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */
  --font-size-5xl: 3rem;       /* 48px */
  --font-size-6xl: 3.75rem;    /* 60px */
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;
  
  /* Layout Dimensions */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  --container-max: 1280px;
  
  --header-height: 72px;
  --header-height-mobile: 64px;
  --footer-height: auto;
  --sidebar-width: 280px;
  
  /* Transitions & Animations */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Z-index Layers */
  --z-negative: -1;
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* Grid Templates */
  --grid-cols-1: repeat(1, minmax(0, 1fr));
  --grid-cols-2: repeat(2, minmax(0, 1fr));
  --grid-cols-3: repeat(3, minmax(0, 1fr));
  --grid-cols-4: repeat(4, minmax(0, 1fr));
  --grid-cols-5: repeat(5, minmax(0, 1fr));
  --grid-cols-6: repeat(6, minmax(0, 1fr));
  --grid-cols-12: repeat(12, minmax(0, 1fr));
  
  /* E-commerce Specific */
  --cart-badge-color: var(--secondary);
  --stock-in-color: var(--success-500);
  --stock-low-color: var(--warning-500);
  --stock-out-color: var(--secondary-400);
  --rating-color: #ffb800;
}

/* Dark Mode Overrides */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: var(--gray-50);
    --text-secondary: var(--gray-300);
    --text-muted: var(--gray-400);
    --bg-primary: var(--gray-900);
    --bg-secondary: var(--gray-800);
    --bg-tertiary: var(--gray-700);
    --bg-card: var(--gray-800);
    --border-color: var(--gray-700);
    --border-color-light: var(--gray-600);
    --border-color-dark: var(--gray-600);
    
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
  }
}

/* ==========================================================================
   3. Enhanced Base Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
}

h1 { 
  font-size: var(--font-size-4xl);
  font-weight: 800;
}
h2 { 
  font-size: var(--font-size-3xl);
  font-weight: 700;
}
h3 { 
  font-size: var(--font-size-2xl);
  font-weight: 600;
}
h4 { 
  font-size: var(--font-size-xl);
  font-weight: 600;
}
h5 { 
  font-size: var(--font-size-lg);
  font-weight: 600;
}
h6 { 
  font-size: var(--font-size-base);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
  line-height: var(--line-height-normal);
}

.lead {
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  font-weight: 500;
}

small,
.text-sm {
  font-size: var(--font-size-sm);
}

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

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

a:focus-visible {
  outline: 2px solid var(--primary-300);
  outline-offset: 2px;
  border-radius: var(--border-radius-xs);
}

/* ==========================================================================
   4. Professional Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  height: var(--header-height);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.site-header.scrolled {
  background: rgba(30, 64, 175, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-xl);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  position: relative;
  gap: var(--space-6);
}

/* Professional Logo */
.logo {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--text-inverse);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: transform var(--transition-base);
}

.logo:hover {
  transform: translateY(-1px);
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary-400), var(--primary-500));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  font-weight: 800;
  font-size: var(--font-size-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.logo:hover .logo-icon {
  transform: rotate(5deg);
  box-shadow: var(--shadow-lg);
}

/* Main Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex: 1;
  justify-content: flex-end;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 600;
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  position: relative;
  overflow: hidden;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--text-inverse);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-inverse);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: calc(100% - 2rem);
}

/* Enhanced Search Box */
.search-box {
  position: relative;
  width: 240px;
}

.search-box input {
  width: 100%;
  padding: var(--space-3) var(--space-10) var(--space-3) var(--space-4);
  border-radius: var(--border-radius-full);
  border: 2px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-inverse);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary-300);
  background: rgba(255, 255, 255, 0.15);
  width: 280px;
  box-shadow: var(--shadow-primary);
}

.search-box input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.search-box button {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  padding: var(--space-1);
  transition: color var(--transition-fast);
}

.search-box button:hover {
  color: var(--text-inverse);
}

/* Enhanced Cart */
.cart-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-inverse);
  font-size: var(--font-size-xl);
  text-decoration: none;
  padding: var(--space-2);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.cart-link:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

.cart-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--cart-badge-color);
  color: var(--text-inverse);
  font-size: var(--font-size-xs);
  font-weight: 700;
  min-width: 20px;
  height: 20px;
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-1);
  border: 2px solid var(--primary-700);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* ==========================================================================
   5. Professional Hero Section
   ========================================================================== */
.hero {
  padding: var(--space-20) 0;
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-primary) 100%);
  position: relative;
  overflow: hidden;
  isolation: isolate;
  margin-top: calc(var(--header-height) * -1);
  padding-top: calc(var(--header-height) + var(--space-20));
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, var(--primary-100) 0%, transparent 50%);
  opacity: 0.6;
  z-index: 0;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  position: relative;
  z-index: 5;
}

.hero-content {
  max-width: 560px;
}

.kicker {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
  color: var(--primary-700);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  line-height: 1.1;
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: var(--line-height-relaxed);
  max-width: 90%;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.hero-image {
  position: relative;
  z-index: 10;
  perspective: 1200px;
}

.hero-card {
  position: relative;
  z-index: 20;
  background: var(--bg-card);
  border-radius: var(--border-radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
  transform: perspective(1200px) rotateY(-8deg) rotateX(2deg);
  transition: transform 0.6s var(--transition-bounce);
  backface-visibility: hidden;
  transform-style: preserve-3d;
}

.hero-card:hover {
  transform: perspective(1200px) rotateY(-2deg) rotateX(1deg) translateY(-8px);
}

.hero-card img {
  width: 100%;
  height: 480px;
  display: block;
  object-fit: cover;
  object-position: center;
  transition: transform 0.8s ease;
}

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

/* Trust Badges */
.trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.badge:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-300);
}

.badge-icon {
  color: var(--primary);
  font-weight: 700;
  font-size: var(--font-size-lg);
}

/* ==========================================================================
   6. Professional Products Section
   ========================================================================== */
.products-section {
  padding: var(--space-16) 0;
  background: var(--bg-secondary);
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
  position: relative;
}

.section-header h2 {
  margin-bottom: var(--space-4);
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: var(--border-radius-full);
}

.section-subtitle {
  color: var(--text-muted);
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

/* Enhanced Product Filter */
.product-filter {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-8) 0 var(--space-12);
}

.filter-btn {
  padding: var(--space-2) var(--space-6);
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.filter-btn::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 ease;
}

.filter-btn:hover::before {
  left: 100%;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Professional Products Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}

/* Enhanced Product Card */
.product-card {
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--border-color);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-300);
}

/* Product Image */
.product-image {
  position: relative;
  width: 100%;
  height: 280px;
  overflow: hidden;
  background: var(--bg-tertiary);
}

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

.product-card:hover .product-image img {
  transform: scale(1.08);
}

/* Product Badges */
.product-badges {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: var(--z-10);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.product-badge {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-sm);
}

.badge-new {
  background: var(--primary);
  color: var(--text-inverse);
}

.badge-sale {
  background: var(--secondary);
  color: var(--text-inverse);
}

.badge-trending {
  background: linear-gradient(135deg, var(--success-500), var(--success-600));
  color: var(--text-inverse);
}

.badge-best {
  background: linear-gradient(135deg, var(--warning-500), var(--warning-600));
  color: var(--text-inverse);
}

/* Quick View Button */
.quick-view-btn {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: rgba(255, 255, 255, 0.95);
  border: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  opacity: 0;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: var(--z-10);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  backdrop-filter: blur(4px);
}

.product-card:hover .quick-view-btn {
  opacity: 1;
  transform: translateY(0);
}

.quick-view-btn:hover {
  background: var(--primary);
  color: var(--text-inverse);
  transform: translateY(0) scale(1.05);
}

/* Product Info */
.product-info {
  padding: var(--space-4);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.product-category {
  display: inline-block;
  color: var(--primary);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.product-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  line-height: 1.4;
  margin: 0;
  min-height: 2.8em;
}

.product-title a {
  color: var(--text-primary);
  text-decoration: none;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-title a:hover {
  color: var(--primary);
}

.product-description {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-2);
}

/* Product Price */
.product-price {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: auto;
  flex-wrap: wrap;
}

.current-price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

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

.discount-badge {
  background: var(--secondary-100);
  color: var(--secondary-700);
  font-size: var(--font-size-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--border-radius-sm);
}

/* Product Stock */
.product-stock {
  font-size: var(--font-size-xs);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.stock-in {
  color: var(--stock-in-color);
}

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

.stock-out {
  color: var(--stock-out-color);
}

/* Product Rating */
.product-rating {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
}

.rating-stars {
  color: var(--rating-color);
}

.rating-count {
  color: var(--text-muted);
  margin-left: var(--space-1);
}

/* Professional Product Actions */
.product-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-color);
}

.product-actions .add-to-cart {
  flex: 1;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
}

.product-actions .add-to-cart:hover {
  background: var(--gray-50);
  border-color: var(--gray-300);
  transform: translateY(-1px);
}

.product-actions .add-to-cart:active {
  transform: translateY(0);
}

.product-actions .buy-now {
  flex: 1;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
  color: var(--text-inverse);
  border: none;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
}

.product-actions .buy-now:hover {
  background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.product-actions .buy-now:active {
  transform: translateY(0);
}

.product-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ==========================================================================
   7. Professional Cart Page (Enhanced)
   ========================================================================== */
.cart-page {
  padding: var(--space-8) 0;
  min-height: 60vh;
  flex: 1;
}

.cart-container {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

/* Cart Items */
.cart-items {
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
  border: 1px solid var(--border-color);
}

.cart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--border-color);
}

.cart-header h2 {
  margin: 0;
  font-size: var(--font-size-2xl);
}

.cart-count {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.cart-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  transition: all var(--transition-base);
}

.cart-item:hover {
  background: var(--bg-tertiary);
  border-radius: var(--border-radius);
  padding: var(--space-4);
}

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

/* Cart Item Image */
.cart-item-image {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
}

.cart-item-image img {
  width: 100px;
  height: 120px;
  object-fit: cover;
  border-radius: var(--border-radius);
  background: var(--bg-tertiary);
  transition: transform var(--transition-base);
}

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

/* Cart Item Info */
.cart-item-info h4 {
  margin: 0 0 var(--space-1);
  font-size: var(--font-size-base);
  font-weight: 600;
}

.cart-item-info h4 a {
  color: var(--text-primary);
  text-decoration: none;
}

.cart-item-info h4 a:hover {
  color: var(--primary);
}

.cart-item-price {
  color: var(--primary);
  font-weight: 700;
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

.cart-item-price del {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-left: var(--space-1);
}

/* Cart Item Quantity */
.cart-item-quantity {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.cart-item-quantity input {
  width: 60px;
  padding: var(--space-2);
  text-align: center;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

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

.qty-btn {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border-color);
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: var(--font-size-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.qty-btn:hover {
  background: var(--gray-100);
  border-color: var(--gray-300);
}

.qty-btn:active {
  transform: scale(0.95);
}

/* Cart Item Actions */
.cart-item-actions {
  text-align: right;
}

.cart-item-total {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  display: block;
}

.remove-btn {
  background: var(--secondary);
  color: var(--text-inverse);
  border: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: all var(--transition-base);
}

.remove-btn:hover {
  background: var(--secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Cart Summary */
.cart-summary {
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
  border: 1px solid var(--border-color);
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
}

.cart-summary h3 {
  margin-bottom: var(--space-4);
  font-size: var(--font-size-xl);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--border-color);
}

.summary-items {
  margin-bottom: var(--space-4);
}

.summary-item {
  display: flex;
  justify-content: space-between;
  padding: var(--space-2) 0;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.summary-item.total {
  border-top: 2px solid var(--border-color);
  margin-top: var(--space-2);
  padding-top: var(--space-3);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
}

.summary-item.grand-total {
  font-size: var(--font-size-xl);
  color: var(--primary);
  margin: var(--space-4) 0;
  padding: var(--space-3) 0;
  border-top: 2px solid var(--border-color);
  border-bottom: 2px solid var(--border-color);
}

/* Cart Actions */
.cart-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.cart-actions .btn {
  width: 100%;
  justify-content: center;
}

.continue-shopping {
  display: inline-block;
  text-align: center;
  color: var(--primary);
  font-weight: 600;
  margin-top: var(--space-3);
  font-size: var(--font-size-sm);
}

.continue-shopping:hover {
  text-decoration: underline;
}

/* Empty Cart */
.empty-cart {
  text-align: center;
  padding: var(--space-12) var(--space-4);
  grid-column: 1 / -1;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: var(--space-4);
  color: var(--text-muted);
  opacity: 0.5;
}

.empty-cart h3 {
  margin-bottom: var(--space-2);
  font-size: var(--font-size-2xl);
}

.empty-cart p {
  color: var(--text-muted);
  margin-bottom: var(--space-6);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   8. Professional Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--border-radius);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
  z-index: 1;
}

.btn:hover::before {
  transform: translateX(100%);
}

.btn:focus {
  outline: 2px solid var(--primary-300);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn span {
  position: relative;
  z-index: 2;
}

/* Button Variants */
.btn-primary {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-50);
  border-color: var(--gray-300);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

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

.btn-outline:hover:not(:disabled) {
  background: var(--primary);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-danger {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-danger:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--secondary-dark), var(--secondary-800));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-success {
  background: linear-gradient(135deg, var(--success-500), var(--success-600));
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-success:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--success-600), var(--success-700));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Button Sizes */
.btn-xs {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--font-size-xl);
}

.btn-block {
  width: 100%;
}

/* Button with Icon */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   9. Professional Footer
   ========================================================================== */
.site-footer {
  background: var(--gray-900);
  color: var(--text-inverse);
  padding: var(--space-12) 0 var(--space-6);
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  padding: 0 var(--space-6);
}

.footer-section h4 {
  color: var(--text-inverse);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-4);
  position: relative;
  padding-bottom: var(--space-2);
}

.footer-section h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background: var(--primary);
  border-radius: var(--border-radius-full);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--gray-300);
  text-decoration: none;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) 0;
}

.footer-links a:hover {
  color: var(--text-inverse);
  padding-left: var(--space-2);
}

/* Newsletter */
.newsletter {
  margin-top: var(--space-4);
}

.newsletter p {
  color: var(--gray-300);
  margin-bottom: var(--space-3);
}

.newsletter-form {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.newsletter-input {
  flex: 1;
  padding: var(--space-3);
  border: 1px solid var(--gray-700);
  border-radius: var(--border-radius);
  background: var(--gray-800);
  color: var(--text-inverse);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--gray-700);
}

.newsletter-note {
  font-size: var(--font-size-xs);
  color: var(--gray-400);
  margin-top: var(--space-2);
}

/* Payment Methods */
.payment-methods {
  text-align: center;
  padding: var(--space-6) 0;
  border-top: 1px solid var(--gray-700);
  border-bottom: 1px solid var(--gray-700);
  margin: var(--space-6) 0;
}

.payment-methods h5 {
  color: var(--gray-300);
  margin-bottom: var(--space-3);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.payment-icons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.payment-icon {
  width: 48px;
  height: 32px;
  background: var(--gray-800);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-300);
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
}

.payment-icon:hover {
  background: var(--gray-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* Footer Bottom */
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--gray-700);
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.copyright {
  color: var(--gray-400);
  font-size: var(--font-size-sm);
}

.social-links {
  display: flex;
  gap: var(--space-3);
}

.social-link {
  color: var(--gray-400);
  text-decoration: none;
  transition: all var(--transition-fast);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-800);
}

.social-link:hover {
  color: var(--text-inverse);
  background: var(--primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   10. Professional WhatsApp Float Button
   ========================================================================== */
.whatsapp-float {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  background: linear-gradient(135deg, #25D366, #128C7E);
  color: var(--text-inverse);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.whatsapp-float:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-2xl);
  background: linear-gradient(135deg, #128C7E, #075E54);
  text-decoration: none;
  color: var(--text-inverse);
}

.whatsapp-icon {
  font-size: var(--font-size-xl);
}

.whatsapp-text {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* ==========================================================================
   11. Enhanced Utility Classes
   ========================================================================== */

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

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Text Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-inverse { color: var(--text-inverse) !important; }
.text-success { color: var(--success-600) !important; }
.text-warning { color: var(--warning-600) !important; }
.text-danger { color: var(--secondary-600) !important; }

.text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.text-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.text-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Spacing Utilities */
.m-0 { margin: 0 !important; }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.ml-0 { margin-left: 0 !important; }
.mr-0 { margin-right: 0 !important; }

.m-2 { margin: var(--space-2) !important; }
.mt-2 { margin-top: var(--space-2) !important; }
.mb-2 { margin-bottom: var(--space-2) !important; }
.ml-2 { margin-left: var(--space-2) !important; }
.mr-2 { margin-right: var(--space-2) !important; }

.m-4 { margin: var(--space-4) !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.ml-4 { margin-left: var(--space-4) !important; }
.mr-4 { margin-right: var(--space-4) !important; }

.p-0 { padding: 0 !important; }
.pt-0 { padding-top: 0 !important; }
.pb-0 { padding-bottom: 0 !important; }
.pl-0 { padding-left: 0 !important; }
.pr-0 { padding-right: 0 !important; }

.p-2 { padding: var(--space-2) !important; }
.pt-2 { padding-top: var(--space-2) !important; }
.pb-2 { padding-bottom: var(--space-2) !important; }
.pl-2 { padding-left: var(--space-2) !important; }
.pr-2 { padding-right: var(--space-2) !important; }

.p-4 { padding: var(--space-4) !important; }
.pt-4 { padding-top: var(--space-4) !important; }
.pb-4 { padding-bottom: var(--space-4) !important; }
.pl-4 { padding-left: var(--space-4) !important; }
.pr-4 { padding-right: var(--space-4) !important; }

/* Flexbox Utilities */
.flex { display: flex !important; }
.flex-col { flex-direction: column !important; }
.flex-row { flex-direction: row !important; }
.flex-wrap { flex-wrap: wrap !important; }
.flex-nowrap { flex-wrap: nowrap !important; }

.items-start { align-items: flex-start !important; }
.items-center { align-items: center !important; }
.items-end { align-items: flex-end !important; }
.items-stretch { align-items: stretch !important; }

.justify-start { justify-content: flex-start !important; }
.justify-center { justify-content: center !important; }
.justify-end { justify-content: flex-end !important; }
.justify-between { justify-content: space-between !important; }
.justify-around { justify-content: space-around !important; }

.gap-0 { gap: 0 !important; }
.gap-2 { gap: var(--space-2) !important; }
.gap-4 { gap: var(--space-4) !important; }
.gap-6 { gap: var(--space-6) !important; }

/* Grid Utilities */
.grid { display: grid !important; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)) !important; }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)) !important; }

.gap-2 { gap: var(--space-2) !important; }
.gap-4 { gap: var(--space-4) !important; }
.gap-6 { gap: var(--space-6) !important; }
.gap-8 { gap: var(--space-8) !important; }

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--space-6);
}

/* Shadow Utilities */
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }
.shadow-none { box-shadow: none !important; }

/* Border Utilities */
.border { border: 1px solid var(--border-color) !important; }
.border-t { border-top: 1px solid var(--border-color) !important; }
.border-b { border-bottom: 1px solid var(--border-color) !important; }
.border-l { border-left: 1px solid var(--border-color) !important; }
.border-r { border-right: 1px solid var(--border-color) !important; }

.rounded { border-radius: var(--border-radius) !important; }
.rounded-sm { border-radius: var(--border-radius-sm) !important; }
.rounded-lg { border-radius: var(--border-radius-lg) !important; }
.rounded-full { border-radius: var(--border-radius-full) !important; }

/* Background Utilities */
.bg-primary { background: var(--primary) !important; }
.bg-secondary { background: var(--bg-secondary) !important; }
.bg-tertiary { background: var(--bg-tertiary) !important; }
.bg-dark { background: var(--bg-dark) !important; }
.bg-card { background: var(--bg-card) !important; }

/* ==========================================================================
   12. Professional Responsive Design
   ========================================================================== */

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
  :root {
    --container-max: 1400px;
  }
}

/* Desktop (1200px - 1439px) */
@media (max-width: 1200px) {
  .container {
    padding: 0 var(--space-4);
  }
  
  .hero-grid {
    gap: var(--space-8);
  }
  
  .cart-container {
    gap: var(--space-6);
  }
}

/* Tablet Landscape (992px - 1199px) */
@media (max-width: 992px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
    --font-size-2xl: 1.375rem;
    --header-height: 64px;
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-8);
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-description {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-image {
    order: -1;
    max-width: 600px;
    margin: 0 auto;
  }
  
  .hero-card img {
    height: 400px;
  }
  
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
  
  .footer-inner {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cart-container {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .cart-summary {
    position: static;
    order: -1;
  }
}

/* Tablet Portrait (768px - 991px) */
@media (max-width: 768px) {
  /* Mobile Navigation */
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
  }
  
  .navbar {
    gap: var(--space-4);
  }
  
  .search-box {
    width: 200px;
  }
  
  .search-box input:focus {
    width: 200px;
  }
  
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: linear-gradient(180deg, var(--primary-800), var(--primary-900));
    flex-direction: column;
    padding: var(--space-4);
    box-shadow: var(--shadow-xl);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }
  
  .main-nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-menu {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }
  
  .nav-item {
    width: 100%;
  }
  
  .nav-link {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    justify-content: space-between;
  }
  
  .nav-link::after {
    display: none;
  }
  
  .search-box {
    width: 100%;
    margin-bottom: var(--space-4);
  }
  
  .search-box input {
    width: 100%;
  }
  
  .search-box input:focus {
    width: 100%;
  }
  
  /* Products */
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-4);
  }
  
  .product-image {
    height: 240px;
  }
  
  .product-actions {
    flex-direction: column;
  }
  
  .product-actions .add-to-cart,
  .product-actions .buy-now {
    width: 100%;
  }
  
  /* Cart Items */
  .cart-item {
    grid-template-columns: 80px 1fr;
    gap: var(--space-3);
  }
  
  .cart-item-actions {
    grid-column: 1 / -1;
    text-align: left;
    margin-top: var(--space-2);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .cart-item-total {
    margin-bottom: 0;
    font-size: var(--font-size-base);
  }
  
  /* Footer */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }
  
  .social-links {
    justify-content: center;
  }
  
  /* WhatsApp Button */
  .whatsapp-text {
    display: none;
  }
  
  .whatsapp-float {
    padding: var(--space-3);
    bottom: var(--space-4);
    right: var(--space-4);
  }
}

/* Mobile Landscape (576px - 767px) */
@media (max-width: 576px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
    --font-size-xl: 1.125rem;
  }
  
  .container {
    padding: 0 var(--space-3);
  }
  
  .hero {
    padding: var(--space-12) 0;
    padding-top: calc(var(--header-height) + var(--space-12));
  }
  
  .hero-card img {
    height: 320px;
  }
  
  .hero-cta {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .hero-cta .btn {
    width: 100%;
    justify-content: center;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .product-filter {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: var(--space-2);
    -webkit-overflow-scrolling: touch;
  }
  
  .filter-btn {
    flex-shrink: 0;
  }
  
  .btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
  }
  
  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
  }
  
  .cart-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

/* Mobile Portrait (≤ 575px) */
@media (max-width: 480px) {
  .logo span:not(.logo-icon) {
    font-size: var(--font-size-xl);
  }
  
  .hero h1 {
    font-size: clamp(1.875rem, 6vw, 2.25rem);
  }
  
  .hero-description {
    font-size: var(--font-size-base);
  }
  
  .cart-item {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .cart-item-image {
    margin: 0 auto;
  }
  
  .cart-item-quantity {
    justify-content: center;
  }
  
  .cart-item-actions {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .cart-actions .btn {
    padding: var(--space-2) var(--space-4);
  }
}

/* ==========================================================================
   13. Professional Print Styles
   ========================================================================== */
@media print {
  .no-print,
  .site-header,
  .site-footer,
  .whatsapp-float,
  .ads-container,
  .hero-cta,
  .product-actions,
  .quick-view-btn,
  .menu-toggle,
  .search-box,
  .cart-actions .btn-secondary {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
    color: #000;
    background: #fff;
    min-height: auto;
  }
  
  a {
    color: #000;
    text-decoration: underline;
  }
  
  .container {
    max-width: none;
    padding: 0;
  }
  
  .hero {
    padding: 1cm 0;
    background: none !important;
  }
  
  .hero h1 {
    -webkit-text-fill-color: #000;
    background: none;
    color: #000;
  }
  
  .products-section {
    page-break-before: always;
  }
  
  .product-card {
    break-inside: avoid;
    box-shadow: none !important;
    border: 1px solid #ddd !important;
    margin-bottom: 1cm;
  }
  
  .cart-page {
    min-height: auto;
  }
  
  .cart-items,
  .cart-summary {
    box-shadow: none;
    border: 1px solid #ddd;
  }
  
  * {
    box-shadow: none !important;
  }
}

/* ==========================================================================
   14. Accessibility & Performance Optimizations
   ========================================================================== */

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .btn::before,
  .nav-link::after,
  .filter-btn::before,
  .cart-badge,
  .whatsapp-float {
    animation: none !important;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --primary: #0000ff;
    --secondary: #ff0000;
    --text-primary: #000000;
    --text-secondary: #333333;
    --border-color: #000000;
  }
  
  .btn,
  .nav-link,
  .filter-btn,
  .product-card {
    border: 2px solid var(--border-color);
  }
}

/* Custom Scrollbar */
@media (min-width: 768px) {
  ::-webkit-scrollbar {
    width: 12px;
    height: 12px;
  }
  
  ::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-full);
  }
  
  ::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: var(--border-radius-full);
    border: 3px solid var(--bg-secondary);
    background-clip: padding-box;
  }
  
  ::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
  }
  
  ::-webkit-scrollbar-corner {
    background: var(--bg-secondary);
  }
}

/* Selection Styling */
::selection {
  background-color: rgba(59, 130, 246, 0.3);
  color: var(--text-primary);
}

::-moz-selection {
  background-color: rgba(59, 130, 246, 0.3);
  color: var(--text-primary);
}

/* Focus Visible */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--border-radius-xs);
}

/* Placeholder Styling */
::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

::-webkit-input-placeholder {
  color: var(--text-muted);
  opacity: 1;
}

::-moz-placeholder {
  color: var(--text-muted);
  opacity: 1;
}

:-ms-input-placeholder {
  color: var(--text-muted);
  opacity: 1;
}

/* Performance Optimizations */
.content-visibility-auto {
  content-visibility: auto;
  contain-intrinsic-size: 0 500px;
}

.will-change-transform {
  will-change: transform;
}

.will-change-opacity {
  will-change: opacity;
}

/* Loading States */
.loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  margin: -12px 0 0 -12px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideIn {
  from { transform: translateX(-20px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.animate-fadeIn { animation: fadeIn 0.5s ease; }
.animate-slideUp { animation: slideUp 0.5s ease; }
.animate-slideIn { animation: slideIn 0.5s ease; }

/* Skeleton Loading */
@keyframes shimmer {
  0% {
    background-position: -468px 0;
  }
  100% {
    background-position: 468px 0;
  }
}

.skeleton {
  background: linear-gradient(
    to right,
    var(--bg-secondary) 0%,
    var(--border-color) 20%,
    var(--bg-secondary) 40%,
    var(--bg-secondary) 100%
  );
  background-size: 800px 104px;
  animation: shimmer 1.5s infinite linear;
  border-radius: var(--border-radius);
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--space-2);
  width: 100%;
}

.skeleton-text-sm {
  height: 0.875em;
  width: 80%;
}

.skeleton-image {
  height: 200px;
  width: 100%;
  border-radius: var(--border-radius);
}

/* ==========================================================================
   15. Professional Notification System
   ========================================================================== */
.notification {
  position: fixed;
  top: calc(var(--header-height) + var(--space-4));
  right: var(--space-4);
  background: var(--bg-card);
  color: var(--text-primary);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-2xl);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  animation: slideIn 0.3s ease;
  max-width: 400px;
  border-left: 4px solid var(--primary);
  border: 1px solid var(--border-color);
}

.notification-success {
  border-left-color: var(--success-500);
  background: var(--success-50);
}

.notification-error {
  border-left-color: var(--secondary);
  background: var(--secondary-50);
}

.notification-info {
  border-left-color: var(--primary);
  background: var(--primary-50);
}

.notification-warning {
  border-left-color: var(--warning-500);
  background: var(--warning-50);
}

.notification-content {
  flex: 1;
}

.notification-title {
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.notification-message {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.notification-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: var(--font-size-lg);
  cursor: pointer;
  padding: var(--space-1);
  margin-left: auto;
  opacity: 0.7;
  transition: all var(--transition-fast);
  border-radius: var(--border-radius);
}

.notification-close:hover {
  opacity: 1;
  background: var(--bg-tertiary);
}

.fade-out {
  animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeOut {
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* ==========================================================================
   16. Professional Form Elements
   ========================================================================== */
.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.form-control {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: all var(--transition-base);
}

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

.form-control:disabled {
  background: var(--bg-secondary);
  color: var(--text-muted);
  cursor: not-allowed;
}

.form-control.error {
  border-color: var(--secondary);
}

.form-error {
  color: var(--secondary);
  font-size: var(--font-size-sm);
  margin-top: var(--space-1);
}

.form-hint {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-top: var(--space-1);
}

/* ==========================================================================
   17. Professional Breadcrumb Navigation
   ========================================================================== */
.breadcrumb {
  padding: var(--space-4) 0;
  background: var(--bg-secondary);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb ol {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: 0;
}

.breadcrumb li:not(:last-child)::after {
  content: '›';
  color: var(--text-muted);
  font-size: var(--font-size-lg);
  line-height: 1;
}

.breadcrumb a {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

.breadcrumb .active {
  color: var(--text-primary);
  font-weight: 600;
}

/* ==========================================================================
   18. Professional Pagination
   ========================================================================== */
.pagination {
  margin-top: var(--space-8);
  display: flex;
  justify-content: center;
}

.pagination-list {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.pagination-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-3);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
}

.pagination-link:hover {
  background: var(--bg-secondary);
  border-color: var(--gray-300);
  transform: translateY(-1px);
}

.pagination-link.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text-inverse);
}

.pagination-link.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   19. Skip to Content (Accessibility)
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--space-4);
  background: var(--primary);
  color: var(--text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius);
  text-decoration: none;
  z-index: var(--z-modal);
  transition: top var(--transition-base);
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-4);
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ==========================================================================
   20. Professional Features & Location Sections
   ========================================================================== */
.features-section {
  padding: var(--space-16) 0;
  background: var(--bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-8);
}

.feature-card {
  text-align: center;
  padding: var(--space-6);
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-300);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  font-size: var(--font-size-2xl);
  color: var(--primary);
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

.location-section {
  padding: var(--space-16) 0;
  background: var(--bg-secondary);
}

.map-container {
  margin-top: var(--space-8);
  position: relative;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

.map-container iframe {
  width: 100%;
  height: 400px;
  border: none;
  display: block;
}

.location-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.info-card {
  background: var(--bg-card);
  padding: var(--space-4);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

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

.info-card h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ==========================================================================
   21. Professional Empty & Error States
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-4);
  grid-column: 1 / -1;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: var(--space-4);
  opacity: 0.3;
  color: var(--text-muted);
}

.empty-state h3 {
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-muted);
  max-width: 400px;
  margin: 0 auto var(--space-6);
}

.error-state {
  text-align: center;
  padding: var(--space-8);
  background: var(--secondary-50);
  border: 1px solid var(--secondary-200);
  border-radius: var(--border-radius-xl);
  color: var(--secondary-700);
  margin: var(--space-4) 0;
}

.error-state h3 {
  color: var(--secondary-700);
  margin-bottom: var(--space-2);
}

/* ==========================================================================
   22. Professional AdSense & Advertisement Styles
   ========================================================================== */
.ads-container {
  margin: var(--space-8) 0;
  text-align: center;
}

.ads-responsive {
  display: block;
  width: 100%;
  max-width: 728px;
  margin: 0 auto;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--space-4);
  min-height: 90px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

/* ==========================================================================
   END OF PROFESSIONAL CSS FRAMEWORK
   ========================================================================== */