/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-secondary: #7c3aed;
  --color-accent: #f59e0b;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;

  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  --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);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
}

/* ===== Dark Mode ===== */
.dark {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-surface: #1e293b;
  --color-border: #334155;
  --color-border-light: #1e293b;

  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-text-inverse: #0f172a;

  --color-primary-light: #1e3a5f;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

/* ===== Base Styles ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main { flex: 1; }

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }
input, select, textarea { font: inherit; color: inherit; }
ul, ol { list-style: none; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--color-text-muted); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-secondary); }

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

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}
@media (min-width: 640px) { .container { padding: 0 1.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 2rem; } }

/* ===== Section ===== */
.section { padding: 3rem 0; }
@media (min-width: 768px) { .section { padding: 5rem 0; } }

.section-header {
  text-align: center;
  margin-bottom: 2.5rem;
}
@media (min-width: 768px) { .section-header { margin-bottom: 3.5rem; } }

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
@media (min-width: 768px) { .section-title { font-size: 2.25rem; } }

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: 1rem;
  max-width: 36rem;
  margin: 0 auto;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1.25rem;
  position: relative;
  overflow: hidden;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-border);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover:not(:disabled) {
  background: var(--color-primary);
  color: #fff;
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}
.btn-danger:hover:not(:disabled) {
  background: #dc2626;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}

.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; border-radius: var(--radius-md); }
.btn-lg { padding: 0.875rem 2rem; font-size: 1rem; border-radius: var(--radius-xl); }
.btn-icon { width: 2.5rem; height: 2.5rem; padding: 0; border-radius: 50%; }
.btn-icon.btn-sm { width: 2rem; height: 2rem; }
.btn-block { width: 100%; }

/* ===== Badge ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  line-height: 1.25rem;
}

/* ===== Navbar ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base), border-color var(--transition-base);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
@supports (backdrop-filter: blur(12px)) {
  .navbar { background: color-mix(in srgb, var(--color-bg) 85%, transparent); }
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.navbar-brand-icon {
  width: 2rem;
  height: 2rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.navbar-nav {
  display: none;
  align-items: center;
  gap: 0.25rem;
}
@media (min-width: 1024px) { .navbar-nav { display: flex; } }

.nav-link {
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.nav-link:hover, .nav-link.active {
  color: var(--color-text);
  background: var(--color-bg-tertiary);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-icon-btn {
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--color-text);
  transition: all var(--transition-fast);
}
.nav-icon-btn:hover { background: var(--color-bg-tertiary); }

.nav-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 1.125rem;
  height: 1.125rem;
  padding: 0 0.25rem;
  background: var(--color-danger);
  color: #fff;
  font-size: 0.625rem;
  font-weight: 700;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.mobile-menu-btn {
  display: flex;
}
@media (min-width: 1024px) { .mobile-menu-btn { display: none; } }

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 4rem;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 40;
  padding: 1.5rem;
  overflow-y: auto;
  border-top: 1px solid var(--color-border);
}
.mobile-menu.open { display: block; }

.mobile-nav-link {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  color: var(--color-text);
  background: var(--color-bg-tertiary);
}

/* ===== Hero Slider ===== */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 50%, #1e1b4b 100%);
  color: #fff;
  padding: 3rem 0 2rem;
}
@media (min-width: 768px) { .hero { padding: 5rem 0 3rem; } }

.hero-slide {
  display: none;
  width: 100%;
  animation: heroFadeIn 0.5s ease;
}
.hero-slide.active { display: block; }
@keyframes heroFadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.hero-content {
  display: grid;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 768px) { .hero-content { grid-template-columns: 1fr 1fr; gap: 3rem; } }

.hero-text h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
}
@media (min-width: 768px) { .hero-text h2 { font-size: 3rem; } }
@media (min-width: 1024px) { .hero-text h2 { font-size: 3.5rem; } }

.hero-text p {
  font-size: 1.0625rem;
  color: #94a3b8;
  margin-bottom: 1.5rem;
  max-width: 28rem;
}
@media (min-width: 768px) { .hero-text p { font-size: 1.125rem; } }

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  order: -1;
}
@media (min-width: 768px) { .hero-image { order: 0; } }

.hero-image img {
  width: 100%;
  max-width: 450px;
  height: auto;
  max-height: 400px;
  object-fit: contain;
  filter: drop-shadow(0 20px 40px rgba(0,0,0,0.4));
  animation: float 6s ease-in-out infinite;
  border-radius: var(--radius-xl);
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-dots {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 2rem;
}
.hero-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.3);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.hero-dot.active { background: #fff; width: 28px; border-radius: 5px; }

/* ===== Product Card ===== */
.product-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 640px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 768px) { .product-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .product-grid { grid-template-columns: repeat(4, 1fr); } }

.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.product-card-image {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--color-bg-secondary);
}
.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.product-card:hover .product-card-image img { transform: scale(1.05); }

.product-card-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 2;
}

.product-card-actions {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  opacity: 0;
  transform: translateX(8px);
  transition: all var(--transition-base);
}
.product-card:hover .product-card-actions,
.product-card-actions.has-item { opacity: 1; transform: translateX(0); }

.product-card-action {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  border: none;
  background: var(--color-surface);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
  font-size: 0.875rem;
}
.product-card-action:hover {
  background: var(--color-primary);
  color: #fff;
}
.product-card-action.wishlist-active {
  background: #fef2f2;
  color: var(--color-danger);
}

.product-card-body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.product-card-category {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.product-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-card-title a { color: inherit; }
.product-card-title a:hover { color: var(--color-primary); }

.product-card-rating {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
}
.stars { color: var(--color-accent); letter-spacing: 1px; }
.rating-count { color: var(--color-text-muted); }

.product-card-price {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: auto;
}
.price-current {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}
.price-compare {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: line-through;
}

.product-card-add {
  margin-top: 0.5rem;
}

/* ===== Category Cards ===== */
.category-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 640px) { .category-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .category-grid { grid-template-columns: repeat(6, 1fr); } }

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem 1rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  text-align: center;
}
.category-card:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.category-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.category-name {
  font-size: 0.875rem;
  font-weight: 600;
}

/* ===== Testimonials ===== */
.testimonial-grid {
  display: grid;
  gap: 1.5rem;
}
@media (min-width: 768px) { .testimonial-grid { grid-template-columns: repeat(3, 1fr); } }

.testimonial-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  transition: all var(--transition-base);
}
.testimonial-card:hover {
  box-shadow: var(--shadow-md);
}

.testimonial-stars { color: var(--color-accent); margin-bottom: 0.75rem; }

.testimonial-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.testimonial-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
}
.testimonial-name { font-size: 0.875rem; font-weight: 600; }
.testimonial-role { font-size: 0.75rem; color: var(--color-text-muted); }

/* ===== Breadcrumbs ===== */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}
.breadcrumbs a { color: var(--color-text-secondary); }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumb-sep { font-size: 0.75rem; }

/* ===== Search & Filter ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
  align-items: center;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  min-width: 200px;
  max-width: 400px;
}
.search-input-wrapper svg {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}
.search-input {
  width: 100%;
  padding: 0.625rem 0.875rem 0.625rem 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}
.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.filter-select {
  padding: 0.625rem 2rem 0.625rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  font-size: 0.875rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M4.646 5.646a.5.5 0 0 1 .708 0L8 8.293l2.646-2.647a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
}
.filter-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  margin-top: 2.5rem;
}
.page-btn {
  min-width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}
.page-btn:hover:not(.active):not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.page-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ===== Product Detail ===== */
.product-detail {
  display: grid;
  gap: 2rem;
  padding: 2rem 0;
}
@media (min-width: 768px) { .product-detail { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1024px) { .product-detail { gap: 4rem; } }

.product-gallery {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.gallery-main {
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
}
.gallery-main img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.gallery-thumbs {
  display: flex;
  gap: 0.75rem;
}
.gallery-thumb {
  width: 5rem;
  height: 5rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--color-bg-secondary);
}
.gallery-thumb.active { border-color: var(--color-primary); }
.gallery-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-info { display: flex; flex-direction: column; gap: 1rem; }

.product-info-category {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.product-info-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
@media (min-width: 768px) { .product-info-title { font-size: 2rem; } }

.product-info-price {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}
.product-info-price .price-current { font-size: 1.75rem; }
.product-info-price .price-compare { font-size: 1rem; }

.product-info-rating {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
}

.product-info-desc {
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: 0.9375rem;
}

.product-colors {
  display: flex;
  gap: 0.5rem;
}
.color-swatch {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}
.color-swatch.active {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.product-sizes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.size-btn {
  min-width: 3rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}
.size-btn:hover { border-color: var(--color-text); }
.size-btn.active {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

.product-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.product-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}
.product-features li::before {
  content: '';
  width: 1.25rem;
  height: 1.25rem;
  background: var(--color-success);
  border-radius: 50%;
  flex-shrink: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='white' viewBox='0 0 16 16'%3E%3Cpath d='M13.854 3.646a.5.5 0 0 1 0 .708l-7 7a.5.5 0 0 1-.708 0l-3.5-3.5a.5.5 0 1 1 .708-.708L6.5 10.293l6.646-6.647a.5.5 0 0 1 .708 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.product-quantity {
  display: flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: fit-content;
}
.qty-btn {
  width: 2.75rem;
  height: 2.75rem;
  border: none;
  background: var(--color-bg-tertiary);
  color: var(--color-text);
  font-size: 1.125rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.qty-btn:hover { background: var(--color-border); }
.qty-input {
  width: 3.5rem;
  height: 2.75rem;
  border: none;
  border-left: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  text-align: center;
  font-weight: 600;
  font-size: 0.9375rem;
  background: var(--color-surface);
  -moz-appearance: textfield;
}
.qty-input::-webkit-outer-spin-button,
.qty-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.product-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ===== Cart Page ===== */
.cart-layout {
  display: grid;
  gap: 2rem;
  padding: 2rem 0;
}
@media (min-width: 1024px) { .cart-layout { grid-template-columns: 1fr 380px; } }

.cart-items { display: flex; flex-direction: column; gap: 1rem; }

.cart-item {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}
.cart-item:hover { box-shadow: var(--shadow-sm); }

.cart-item-image {
  width: 6rem;
  height: 6rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-bg-secondary);
}
.cart-item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cart-item-body { flex: 1; display: flex; flex-direction: column; gap: 0.375rem; }
.cart-item-title { font-weight: 600; font-size: 0.9375rem; }
.cart-item-variant { font-size: 0.8125rem; color: var(--color-text-muted); }
.cart-item-price { font-weight: 700; font-size: 0.9375rem; }

.cart-item-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

.cart-item-remove {
  color: var(--color-text-muted);
  background: none;
  border: none;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.cart-item-remove:hover { color: var(--color-danger); }

/* Cart Summary */
.cart-summary {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  position: sticky;
  top: 5rem;
  height: fit-content;
}

.cart-summary-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.cart-summary-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-size: 0.9375rem;
}
.cart-summary-row.text-muted { color: var(--color-text-muted); font-size: 0.875rem; }
.cart-summary-row.total {
  font-weight: 700;
  font-size: 1.125rem;
  padding-top: 1rem;
  margin-top: 0.5rem;
  border-top: 1px solid var(--color-border);
}

/* Coupon */
.coupon-input-group {
  display: flex;
  gap: 0.5rem;
  margin: 1rem 0;
}
.coupon-input {
  flex: 1;
  padding: 0.625rem 0.875rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-size: 0.875rem;
}
.coupon-input:focus { outline: none; border-color: var(--color-primary); }

/* ===== Checkout Form ===== */
.checkout-layout {
  display: grid;
  gap: 2rem;
  padding: 2rem 0;
}
@media (min-width: 1024px) { .checkout-layout { grid-template-columns: 1fr 400px; } }

.checkout-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.checkout-section-title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.form-grid {
  display: grid;
  gap: 1rem;
}
.form-grid.cols-2 {
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .form-grid.cols-2 { grid-template-columns: 1fr 1fr; } }

.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
.form-label { font-size: 0.8125rem; font-weight: 600; color: var(--color-text-secondary); }
.form-input, .form-textarea {
  padding: 0.75rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-textarea { resize: vertical; min-height: 80px; }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}
.modal {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp 0.3s ease;
}
.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 2;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: none;
  background: var(--color-bg-tertiary);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
}
.modal-close:hover { background: var(--color-border); }

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

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  font-size: 0.875rem;
  font-weight: 500;
  animation: slideInRight 0.3s ease;
  min-width: 280px;
  max-width: 400px;
}
.toast.success { border-left: 3px solid var(--color-success); }
.toast.error { border-left: 3px solid var(--color-danger); }
.toast.info { border-left: 3px solid var(--color-info); }
.toast-icon { font-size: 1.125rem; flex-shrink: 0; }

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

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
}
.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.4;
}
.empty-state-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.empty-state-text {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  max-width: 24rem;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Skeleton Loading ===== */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-secondary) 50%, var(--color-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

.skeleton-card { border-radius: var(--radius-xl); overflow: hidden; border: 1px solid var(--color-border); }
.skeleton-img { aspect-ratio: 1; }
.skeleton-body { padding: 1rem; display: flex; flex-direction: column; gap: 0.5rem; }
.skeleton-line { height: 0.875rem; }
.skeleton-line.short { width: 60%; }
.skeleton-line.medium { width: 80%; }

/* ===== Auth Pages ===== */
.auth-page {
  min-height: calc(100vh - 4rem);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}
.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: 2rem;
}
@media (min-width: 640px) { .auth-card { padding: 2.5rem; } }

.auth-title {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.25rem;
}
.auth-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 2rem;
}

.auth-separator {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}
.auth-separator::before,
.auth-separator::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}
.social-btn:hover { background: var(--color-bg-tertiary); }

/* ===== Dashboard ===== */
.dashboard-layout {
  display: grid;
  gap: 2rem;
  padding: 2rem 0;
}
@media (min-width: 1024px) { .dashboard-layout { grid-template-columns: 250px 1fr; } }

.dashboard-sidebar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  height: fit-content;
}
.dashboard-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.dashboard-nav-link:hover, .dashboard-nav-link.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.dashboard-stats {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 768px) { .dashboard-stats { grid-template-columns: repeat(4, 1fr); } }

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.25rem;
}
.stat-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}
.stat-value { font-size: 1.5rem; font-weight: 700; }
.stat-label { font-size: 0.8125rem; color: var(--color-text-muted); }

/* ===== About / Contact / FAQ ===== */
.page-header {
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 3rem 0;
  text-align: center;
}
.page-header-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
@media (min-width: 768px) { .page-header-title { font-size: 2.5rem; } }
.page-header-subtitle { color: var(--color-text-secondary); max-width: 36rem; margin: 0 auto; }

.content-section {
  padding: 3rem 0;
  max-width: 800px;
  margin: 0 auto;
}
.content-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  margin-top: 2rem;
}
.content-section h2:first-child { margin-top: 0; }
.content-section p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 0.75rem; }
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem;
  background: none;
  border: none;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
}
.faq-answer {
  display: none;
  padding: 0 1.25rem 1.25rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: 0.9375rem;
}
.faq-item.open .faq-answer { display: block; }
.faq-item.open .faq-icon { transform: rotate(180deg); }
.faq-icon { transition: transform var(--transition-fast); color: var(--color-text-muted); }

/* ===== 404 Page ===== */
.not-found-page {
  min-height: calc(100vh - 4rem);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}
.not-found-code {
  font-size: 8rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.15;
}
.not-found-title { font-size: 1.5rem; font-weight: 700; margin: 1rem 0 0.5rem; }
.not-found-text { color: var(--color-text-secondary); margin-bottom: 2rem; }

/* ===== Footer ===== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0 1.5rem;
  margin-top: auto;
}
.footer-grid {
  display: grid;
  gap: 2rem;
}
@media (min-width: 640px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }

.footer-brand-desc {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
  margin-top: 0.75rem;
  max-width: 20rem;
}

.footer-heading {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.footer-links { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}
.footer-link:hover { color: var(--color-primary); }

.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  transition: all var(--transition-fast);
}
.theme-toggle:hover { background: var(--color-bg-tertiary); }

/* ===== Wishlist Page ===== */
.wishlist-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 768px) { .wishlist-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .wishlist-grid { grid-template-columns: repeat(4, 1fr); } }

/* ===== Utility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}
.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.w-full { width: 100%; }

/* ===== Print Styles ===== */
@media print {
  .navbar, .footer, .toast-container, .mobile-menu { display: none !important; }
  body { background: #fff; color: #000; }
}