/* ===========================================================
   YOUR STORE - PREMIUM DESIGN SYSTEM 2026
   ===========================================================
   Features: Dark mode, CSS variables, micro-interactions,
   responsive grid, accessibility optimized
   =========================================================== */

/* ── 1. DESIGN TOKENS ────────────────────────────────────── */
:root {
  /* Brand Colors - Premium Teal Palette */
  --color-primary: #0d9488;
  --color-primary-hover: #0f766e;
  --color-primary-light: #99f6e4;
  --color-accent: #f59e0b;
  --color-accent-hover: #d97706;
  
  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Neutral Scale */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, 'BlinkMacSystemFont', 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'Fira Code', 'JetBrains Mono', Consolas, monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --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;
  
  /* Radii */
  --radius-xs: 0.125rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* Dark Mode Variables */
[data-theme="dark"], @media (prefers-color-scheme: dark) {
  --color-white: #111827;
  --color-black: #fafafa;
  --color-gray-50: #1f2937;
  --color-gray-100: #374151;
  --color-gray-200: #4b5563;
  --color-gray-300: #6b7280;
  --color-gray-400: #9ca3af;
  --color-gray-500: #d1d5db;
  --color-gray-600: #e5e7eb;
  --color-gray-700: #f3f4f6;
  --color-gray-800: #f9fafb;
  --color-gray-900: #ffffff;
  
  --color-background: var(--color-gray-900);
  --color-foreground: var(--color-gray-50);
  --color-surface: var(--color-gray-800);
  --color-border: var(--color-gray-600);
}

/* Light Mode Variables (explicit) */
[data-theme="light"] {
  --color-background: #ffffff;
  --color-foreground: #111827;
  --color-surface: #ffffff;
  --color-border: var(--color-gray-200);
}

/* Default theme */
:root {
  --color-background: var(--color-white);
  --color-foreground: var(--color-gray-900);
  --color-surface: var(--color-white);
  --color-border: var(--color-gray-200);
}

/* ===========================================================
   2. RESET & BASE STYLES
   =========================================================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  color: var(--color-foreground);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Focus Visible Support */
.js-focus-visible *:focus:not(.focus-visible) {
  outline: none;
}

/* ===========================================================
   3. PREMIUM HEADER
   =========================================================== */
.premium-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.premium-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.header-top {
  display: flex;
  align-items: center;
  width: 100%;
  padding: var(--space-4) 0;
}

/* Brand Section */
.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-foreground);
}

.brand-logo {
  height: 2.5rem;
  width: auto;
  transition: transform var(--transition-fast);
}

.brand-logo:hover {
  transform: scale(1.05);
}

.brand-text {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Search Section */
.header-search {
  flex: 1;
  max-width: 28rem;
  margin: 0 var(--space-6);
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-left: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  background: var(--color-surface);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.2);
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-gray-400);
  pointer-events: none;
}

/* Actions Section */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.action-item {
  position: relative;
  text-decoration: none;
  color: var(--color-foreground);
  transition: color var(--transition-fast);
}

.action-item:hover {
  color: var(--color-primary);
}

.action-badge {
  position: absolute;
  top: -0.25rem;
  right: -0.25rem;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  min-width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  padding: 0.125rem;
}

/* Navigation */
.premium-nav {
  width: 100%;
  border-top: 1px solid var(--color-border);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  color: var(--color-gray-600);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  color: var(--color-gray-600);
  transition: color var(--transition-fast);
}

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

/* ===========================================================
   4. PREMIUM HERO SECTION
   =========================================================== */
.hero-section {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f0fdfa 0%, #ccfbf1 50%, #a7f3d0 100%);
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230d9488' fill-opacity='0.03'%3E%3Cpath d='M56 56v-4H4v4h52zM56 4v4H4V4h52zM4 4v52h4V4H4zm52 0v52h4V4h-4z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  max-width: var(--container-xl);
  text-align: center;
  padding: var(--space-20);
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-gray-600);
  margin-bottom: var(--space-8);
}

.hero-search {
  max-width: 40rem;
  margin: 0 auto;
}

/* ===========================================================
   5. PREMIUM PRODUCT GRID
   =========================================================== */
.products-section {
  padding: var(--space-20) 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-foreground);
}

.view-all-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: gap var(--transition-fast);
}

.view-all-link:hover {
  gap: var(--space-3);
}

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

/* ===========================================================
   6. PREMIUM PRODUCT CARD
   =========================================================== */
.premium-product-card {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.premium-product-card:hover {
  transform: translateY(-0.5rem);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-light);
}

.product-image-wrapper {
  position: relative;
  padding-bottom: 100%;
  overflow: hidden;
  background: var(--color-gray-50);
}

.product-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.product-badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
}

.product-badge.sale {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
}

.product-content {
  padding: var(--space-4);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-foreground);
  margin-bottom: var(--space-2);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

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

.price-original {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  text-decoration: line-through;
}

.price-discount {
  font-size: var(--font-size-xs);
  background: var(--color-accent);
  color: var(--color-white);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
}

/* ===========================================================
   7. PREMIUM CATEGORY CARD
   =========================================================== */
.categories-section {
  padding: var(--space-20) 0;
  background: var(--color-gray-50);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-4);
}

.premium-category-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  text-align: center;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid var(--color-border);
}

.premium-category-card:hover {
  transform: translateY(-0.25rem);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.category-icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
}

.category-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-foreground);
}

/* ===========================================================
   8. PREMIUM FOOTER
   =========================================================== */
.premium-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: auto;
}

.footer-container {
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer-logo {
  height: 2rem;
}

.footer-description {
  font-size: var(--font-size-sm);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.social-links {
  display: flex;
  gap: var(--space-2);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-gray-800);
  border-radius: var(--radius-lg);
  color: var(--color-gray-300);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-0.125rem);
}

.footer-column h4 {
  color: var(--color-white);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-gray-700);
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ===========================================================
   9. RESPONSIVE
   =========================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-4);
  }
}

@media (max-width: 768px) {
  .header-top {
    flex-wrap: wrap;
  }
  
  .header-search {
    order: 3;
    flex: 1 1 100%;
    max-width: 100%;
    margin: var(--space-3) 0 0;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-section {
    min-height: 60vh;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
}

/* ===========================================================
   10. UTILITIES
   =========================================================== */
.container {
  width: 100%;
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.text-center {
  text-align: center;
}

.text-primary {
  color: var(--color-primary);
}

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

.rounded-full {
  border-radius: var(--radius-full);
}

.shadow-md {
  box-shadow: var(--shadow-md);
}

.transition-all {
  transition: all var(--transition-normal);
}

/* Loading States */
.loading-skeleton {
  background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

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

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