/* ============================================================
   TerraMech Global Stylesheet - E-COMMERCE SUPERPOWER EDITION
   Mobile-First, Tablet-Optimized, Desktop-Enhanced
   Inspired by: Amazon, Shein, Alibaba, Takealot, Uber
   ============================================================ */

/* ───────── ROOT VARIABLES - Enhanced E-commerce System ───────── */
:root {
  /* 🎨 BRAND COLOR SYSTEM - Amazon-inspired */
  --primary: #ffd700;
  --primary-light: #fff0b3;
  --primary-dark: #e6b800;
  --primary-gradient: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
  
  /* 🎨 NEUTRAL SYSTEM - Uber-inspired clarity */
  --black: #000000;
  --gray-900: #111111;
  --gray-800: #1a1a1a;
  --gray-700: #2a2a2a;
  --gray-600: #404040;
  --gray-500: #666666;
  --gray-400: #888888;
  --gray-300: #b0b0b0;
  --gray-200: #d1d1d1;
  --gray-100: #e6e6e6;
  --gray-50: #f5f5f5;
  --white: #ffffff;
  
  /* 🎨 FUNCTIONAL COLORS - Takealot-inspired */
  --success: #00a650;
  --warning: #ff6b00;
  --error: #ff4444;
  --info: #0066cc;
  
  /* 🎨 E-COMMERCE SPECIFIC - Shein-inspired */
  --sale: #ff4444;
  --hot: #ff6b00;
  --new: #00a650;
  --trending: #9c27b0;
  
  /* 📐 TYPOGRAPHY SCALE - Modern fluid system */
  --text-xs: clamp(0.75rem, 0.7vw + 0.5rem, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8vw + 0.6rem, 1rem);
  --text-base: clamp(1rem, 1vw + 0.7rem, 1.125rem);
  --text-lg: clamp(1.125rem, 1.2vw + 0.8rem, 1.25rem);
  --text-xl: clamp(1.25rem, 1.4vw + 0.9rem, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.8vw + 1rem, 2rem);
  --text-3xl: clamp(2rem, 2.5vw + 1.2rem, 3rem);
  --text-4xl: clamp(2.5rem, 3.5vw + 1.5rem, 4rem);
  
  /* 📐 SPACING SYSTEM - 8pt grid */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* 📐 BORDER RADIUS - Modern scale */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 50%;
  
  /* ⚡ TRANSITIONS - Smooth and fast */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* 🌟 SHADOWS - Depth system */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7), 0 4px 6px -2px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.8), 0 10px 10px -5px rgba(0, 0, 0, 0.6);
  --shadow-gold: 0 0 0 1px var(--primary), 0 4px 12px rgba(255, 215, 0, 0.3);
  
  /* 📱 BREAKPOINTS - Mobile-first */
  --mobile: 320px;
  --mobile-lg: 480px;
  --tablet: 768px;
  --tablet-lg: 1024px;
  --desktop: 1280px;
  --desktop-lg: 1440px;
  --desktop-xl: 1920px;
}

/* ───────── RESET & BASE - Modern CSS Reset ───────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--black);
  color: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ───────── TYPOGRAPHY SYSTEM - Fluid responsive ───────── */
h1, .h1 { font-size: var(--text-4xl); font-weight: 800; line-height: 1.1; }
h2, .h2 { font-size: var(--text-3xl); font-weight: 700; line-height: 1.2; }
h3, .h3 { font-size: var(--text-2xl); font-weight: 600; line-height: 1.3; }
h4, .h4 { font-size: var(--text-xl); font-weight: 600; line-height: 1.4; }
h5, .h5 { font-size: var(--text-lg); font-weight: 500; line-height: 1.5; }
h6, .h6 { font-size: var(--text-base); font-weight: 500; line-height: 1.6; }

.text-gradient {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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

/* ───────── LAYOUT SYSTEM - Mobile-first grid ───────── */
.container {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 960px;
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1200px;
  }
}

@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
  }
}

/* 🎯 GRID SYSTEM - Amazon-inspired responsive grid */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
}

.grid-products {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .grid-products {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-8);
  }
}

/* 🎯 FLEX SYSTEM - Uber-inspired utility classes */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.flex-1 { flex: 1; }
.flex-auto { flex: auto; }

/* ───────── COMPONENT SYSTEM - E-commerce focused ───────── */

/* 🛍️ PRODUCT CARD - Amazon + Shein hybrid */
.product-card {
  background: var(--gray-900);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

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

.product-image {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  background: var(--gray-800);
  overflow: hidden;
}

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

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

/* 🏷️ BADGE SYSTEM - Shein-inspired */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary { background: var(--primary); color: var(--black); }
.badge-sale { background: var(--sale); color: var(--white); }
.badge-new { background: var(--new); color: var(--white); }
.badge-hot { background: var(--hot); color: var(--white); }
.badge-trending { background: var(--trending); color: var(--white); }

.badge-top-left {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 10;
}

.badge-top-right {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  z-index: 10;
}

/* ❤️ WISHLIST BUTTON - Modern floating action */
.wishlist-btn {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  color: var(--white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-normal);
  z-index: 20;
}

.wishlist-btn:hover {
  background: rgba(0, 0, 0, 0.9);
  transform: scale(1.1);
}

.wishlist-btn.active {
  background: var(--sale);
  color: var(--white);
}

/* 🛒 QUICK ACTIONS - Takealot-inspired */
.quick-actions {
  position: absolute;
  bottom: var(--space-4);
  left: var(--space-4);
  right: var(--space-4);
  display: flex;
  gap: var(--space-2);
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition-normal);
}

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

.quick-action-btn {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid var(--gray-600);
  border-radius: var(--radius-md);
  color: var(--white);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
}

.quick-action-btn:hover {
  background: var(--primary);
  color: var(--black);
  border-color: var(--primary);
}

/* 🎯 BUTTON SYSTEM - Uber-inspired clarity */
.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(--radius-lg);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.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: var(--transition-slow);
}

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

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.btn-secondary {
  background: var(--gray-700);
  color: var(--white);
  border: 1px solid var(--gray-600);
}

.btn-secondary:hover {
  background: var(--gray-600);
  border-color: var(--primary);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--gray-600);
}

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

/* 📱 NAVIGATION - Modern sticky nav */
.main-nav {
  position: sticky;
  top: 0;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--gray-800);
  z-index: 1000;
  padding: var(--space-4) 0;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav-search {
  flex: 1;
  max-width: 600px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-8) var(--space-3) var(--space-4);
  background: var(--gray-800);
  border: 2px solid var(--gray-700);
  border-radius: var(--radius-lg);
  color: var(--white);
  font-size: var(--text-base);
  transition: var(--transition-normal);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--gray-900);
}

.search-icon {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.cart-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--sale);
  color: var(--white);
  border-radius: var(--radius-full);
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 600;
}

/* 🎯 HERO SECTION - Amazon-inspired */
.hero-section {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--black) 100%);
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 215, 0, 0.05) 0%, transparent 50%);
  z-index: 1;
}

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

/* 🎯 CATEGORY GRID - Alibaba-inspired */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .category-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .category-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

.category-card {
  background: var(--gray-900);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  transition: var(--transition-normal);
  cursor: pointer;
}

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

/* 🎯 FILTER SYSTEM - Amazon-inspired sidebar */
.filter-sidebar {
  background: var(--gray-900);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  height: fit-content;
  position: sticky;
  top: var(--space-20);
}

.filter-group {
  margin-bottom: var(--space-6);
}

.filter-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--white);
}

.filter-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.filter-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  cursor: pointer;
}

.filter-option input[type="checkbox"] {
  width: 18px;
  height: 18px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--gray-600);
  background: var(--gray-800);
}

/* 🎯 PAGINATION - Modern e-commerce */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin: var(--space-12) 0;
}

.pagination-btn {
  padding: var(--space-3) var(--space-4);
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-md);
  color: var(--white);
  cursor: pointer;
  transition: var(--transition-fast);
}

.pagination-btn:hover {
  background: var(--gray-700);
  border-color: var(--primary);
}

.pagination-btn.active {
  background: var(--primary);
  color: var(--black);
  border-color: var(--primary);
}

/* 🎯 TOAST SYSTEM - Modern notifications */
.toast {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  background: var(--gray-900);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transform: translateY(100px);
  opacity: 0;
  transition: var(--transition-normal);
  z-index: 10000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-success {
  border-left: 4px solid var(--success);
}

.toast-error {
  border-left: 4px solid var(--error);
}

.toast-warning {
  border-left: 4px solid var(--warning);
}

/* 🎯 LOADING STATES - Modern skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--gray-800) 25%, var(--gray-700) 50%, var(--gray-800) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

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

.skeleton-image {
  width: 100%;
  aspect-ratio: 1;
}

/* 🎯 MOBILE MENU - Uber-inspired */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--black);
  z-index: 2000;
  transform: translateX(-100%);
  transition: var(--transition-normal);
  overflow-y: auto;
}

.mobile-menu.active {
  transform: translateX(0);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: var(--transition-normal);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* 🎯 RESPONSIVE DESIGN - Mobile-first breakpoints */
@media (max-width: 767px) {
  .menu-toggle {
    display: flex;
  }
  
  .nav-search {
    display: none;
  }
  
  .nav-actions {
    gap: var(--space-3);
  }
  
  .hero-section {
    min-height: 50vh;
    padding: var(--space-12) 0;
  }
  
  .filter-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1500;
    transform: translateX(-100%);
    transition: var(--transition-normal);
    overflow-y: auto;
  }
  
  .filter-sidebar.active {
    transform: translateX(0);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .container {
    padding: 0 var(--space-6);
  }
  
  .grid-products {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (min-width: 1024px) {
  .main-nav {
    padding: var(--space-4) 0;
  }
  
  .hero-section {
    min-height: 70vh;
  }
}

/* 🎯 UTILITY CLASSES - Comprehensive system */
.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;
}

/* 🎯 ACCESSIBILITY - Enhanced focus states */
.focus\:ring:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* 🎯 DARK MODE ENHANCEMENTS */
@media (prefers-color-scheme: dark) {
  .product-card {
    background: var(--gray-900);
    border-color: var(--gray-700);
  }
  
  .search-input {
    background: var(--gray-800);
    border-color: var(--gray-700);
  }
}

/* 🎯 PERFORMANCE OPTIMIZATIONS */
.will-change-transform {
  will-change: transform;
}

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

/* 🎯 PRINT STYLES */
@media print {
  .no-print {
    display: none !important;
  }
  
  .product-card {
    break-inside: avoid;
    border: 1px solid #000;
  }
}

/* 🎯 HIGH CONTRAST MODE SUPPORT */
@media (prefers-contrast: high) {
  :root {
    --primary: #000000;
    --gray-900: #000000;
    --gray-800: #111111;
    --gray-700: #222222;
  }
  
  .product-card {
    border: 2px solid var(--white);
  }
}

/* 🎯 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;
    scroll-behavior: auto !important;
  }
}