/* ========================================
   GlobalShop - Modern E-commerce Design System
   ======================================== */

/* Google Fonts - Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ============ CSS Variables ============ */
:root {
  /* Colors */
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;

  --accent: #8b5cf6;
  --accent-light: #a78bfa;
  --accent-dark: #7c3aed;

  --success: #10b981;
  --success-light: #34d399;
  --success-bg: #ecfdf5;

  --warning: #f59e0b;
  --warning-light: #fbbf24;
  --warning-bg: #fffbeb;

  --danger: #ef4444;
  --danger-light: #f87171;
  --danger-bg: #fef2f2;

  --info: #06b6d4;
  --info-bg: #ecfeff;

  /* Neutrals */
  --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;

  --white: #ffffff;
  --body-bg: #f0f2f5;
  --card-bg: #ffffff;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --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;

  --line-height: 1.6;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.03);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.15);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Layout */
  --header-height: 64px;
  --container-max: 1280px;
  --sidebar-width: 240px;
}

/* ============ Reset & Base ============ */
*, *::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);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--gray-800);
  background-color: var(--body-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

input, select, textarea, button {
  font-family: inherit;
  font-size: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: 1.3;
  color: var(--gray-900);
}

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

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding-top: calc(var(--header-height) + var(--space-lg));
  padding-bottom: var(--space-3xl);
}

/* ============ Header / Navigation ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--gray-900);
  text-decoration: none;
}

.site-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
}

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

.nav-links a {
  padding: var(--space-sm) var(--space-md);
  color: var(--gray-600);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-50);
}

.nav-links a.btn-primary {
  color: white !important;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
}

.nav-links a.btn-primary:hover {
  color: white !important;
  background: linear-gradient(135deg, var(--primary-light), var(--primary)) !important;
}

.nav-links a .cart-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 18px;
  height: 18px;
  background: var(--danger);
  color: white;
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--gray-700);
  font-size: 24px;
}

/* ============ Hero / Carousel ============ */
.hero-carousel {
  margin-bottom: var(--space-2xl);
}

.carousel-wrapper {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-50), #f0e6ff);
  min-height: 360px;
}

.carousel-slide {
  display: none;
  position: relative;
  min-height: 360px;
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-3xl);
}

.carousel-slide.active {
  display: flex;
}

.carousel-content {
  max-width: 55%;
  position: relative;
  z-index: 2;
}

.carousel-image {
  position: absolute;
  right: 0;
  top: 0;
  height: 100%;
  width: 45%;
  object-fit: cover;
  z-index: 1;
}

.carousel-content h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
  color: var(--gray-900);
  line-height: 1.2;
}

.carousel-content p {
  font-size: var(--font-size-lg);
  color: var(--gray-600);
  margin-bottom: var(--space-xl);
  line-height: 1.5;
}

/* carousel-image defined above */

.carousel-dots {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--space-sm);
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: rgba(0,0,0,0.2);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.carousel-dot.active {
  background: var(--primary);
  width: 28px;
}

/* ============ Cards ============ */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  overflow: hidden;
  transition: all var(--transition-base);
}

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

.card-body {
  padding: var(--space-lg);
}

.card-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.card-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--gray-100);
  background: var(--gray-50);
}

/* ============ Product Card ============ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.product-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  overflow: hidden;
  transition: all var(--transition-base);
  position: relative;
}

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

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

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

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

.product-card .product-actions {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  opacity: 0;
  transform: translateX(10px);
  transition: all var(--transition-base);
}

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

.product-card .product-actions button {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--white);
  color: var(--gray-600);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.product-card .product-actions button:hover {
  background: var(--primary);
  color: white;
}

.product-card .product-actions button.favorited {
  background: var(--danger);
  color: white;
}

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

.product-card .product-category {
  font-size: var(--font-size-xs);
  color: var(--primary);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-xs);
}

.product-card .product-name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--gray-900);
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.product-card .product-name a {
  color: inherit;
}

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

.product-card .product-price-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.product-card .product-price {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--danger);
}

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

.product-card .add-cart-btn {
  margin-top: var(--space-sm);
  width: 100%;
}

/* Product badge */
.product-badge {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  z-index: 2;
}

.product-badge.sale {
  background: var(--danger);
  color: white;
}

.product-badge.new {
  background: var(--success);
  color: white;
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  transform: translateY(-1px);
  color: white;
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.btn-accent:hover {
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
  transform: translateY(-1px);
  color: white;
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--gray-300);
  color: var(--gray-700);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-50);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
}

.btn-ghost:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

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

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

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

.btn-sm {
  padding: 6px 12px;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: 14px 28px;
  font-size: var(--font-size-lg);
}

.btn-xl {
  padding: 16px 36px;
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* ============ Forms ============ */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
  margin-bottom: var(--space-sm);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: var(--font-size-base);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  background: var(--white);
  color: var(--gray-800);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-100);
}

.form-input::placeholder {
  color: var(--gray-400);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  margin-top: var(--space-xs);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--danger);
  margin-top: var(--space-xs);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--gray-300);
  transition: var(--transition-fast);
  border-radius: var(--radius-full);
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-fast);
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--primary);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(20px);
}

/* ============ Badges ============ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  line-height: 1.4;
}

.badge-primary {
  background: var(--primary-100);
  color: var(--primary-dark);
}

.badge-success {
  background: var(--success-bg);
  color: #065f46;
}

.badge-warning {
  background: var(--warning-bg);
  color: #92400e;
}

.badge-danger {
  background: var(--danger-bg);
  color: #991b1b;
}

.badge-info {
  background: var(--info-bg);
  color: #155e75;
}

.badge-secondary {
  background: var(--gray-100);
  color: var(--gray-600);
}

/* ============ Alerts ============ */
.alert {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.alert-success {
  background: var(--success-bg);
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-warning {
  background: var(--warning-bg);
  color: #92400e;
  border: 1px solid #fde68a;
}

.alert-danger {
  background: var(--danger-bg);
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-info {
  background: var(--info-bg);
  color: #155e75;
  border: 1px solid #a5f3fc;
}

/* ============ Tables ============ */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  background: var(--gray-50);
  padding: 12px 16px;
  text-align: left;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

.data-table td {
  padding: 12px 16px;
  font-size: var(--font-size-sm);
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: var(--gray-50);
}

.data-table .cell-actions {
  display: flex;
  gap: var(--space-xs);
}

/* ============ Collapsible / Accordion ============ */
.collapse-panel {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.collapse-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.collapse-header:hover {
  background: var(--gray-50);
}

.collapse-header .collapse-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--gray-800);
}

.collapse-header .collapse-icon {
  transition: transform var(--transition-base);
  color: var(--gray-400);
  font-size: var(--font-size-sm);
}

.collapse-panel.open .collapse-icon {
  transform: rotate(180deg);
}

.collapse-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.collapse-panel.open .collapse-body {
  max-height: 5000px;
  transition: max-height 0.5s ease;
}

.collapse-content {
  padding: 0 var(--space-lg) var(--space-lg);
}

/* ============ Modal ============ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  width: 90%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: var(--font-size-lg);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--gray-100);
  color: var(--gray-500);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--gray-200);
  color: var(--gray-800);
}

.modal-body {
  padding: var(--space-lg);
}

.modal-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--gray-100);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
}

/* ============ Tabs ============ */
.tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 2px solid var(--gray-100);
  margin-bottom: var(--space-xl);
  overflow-x: auto;
}

.tab-item {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-500);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition-fast);
  white-space: nowrap;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

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

.tab-item.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* ============ Empty State ============ */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
}

.empty-state .empty-icon {
  font-size: 64px;
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: var(--font-size-xl);
  color: var(--gray-600);
  margin-bottom: var(--space-sm);
}

.empty-state p {
  color: var(--gray-400);
  margin-bottom: var(--space-xl);
}

/* ============ Tags ============ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--gray-100);
  color: var(--gray-600);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ============ Section Title ============ */
.section-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-title h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--gray-900), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title p {
  color: var(--gray-500);
  font-size: var(--font-size-lg);
}

/* ============ Footer ============ */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand .site-logo {
  color: var(--white);
  margin-bottom: var(--space-md);
}

.footer-brand p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--white);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-lg);
}

.footer-col a {
  display: block;
  color: var(--gray-400);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-xl);
  text-align: center;
  font-size: var(--font-size-sm);
}

/* ============ Animations ============ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

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

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

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.fade-in {
  animation: fadeIn 0.4s ease;
}

.fade-in-up {
  animation: fadeInUp 0.5s ease;
}

/* Staggered animation for grid items */
.product-card { animation: fadeInUp 0.4s ease both; }
.product-card:nth-child(1) { animation-delay: 0s; }
.product-card:nth-child(2) { animation-delay: 0.05s; }
.product-card:nth-child(3) { animation-delay: 0.1s; }
.product-card:nth-child(4) { animation-delay: 0.15s; }
.product-card:nth-child(5) { animation-delay: 0.2s; }
.product-card:nth-child(6) { animation-delay: 0.25s; }

/* ============ Utilities ============ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }
.text-lg { font-size: var(--font-size-lg); }
.text-muted { color: var(--gray-500); }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.d-flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.w-full { width: 100%; }
.hidden { display: none !important; }

/* ============ Grid System ============ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }

/* ============ Product Detail ============ */
.product-detail-layout {
  display: grid;
  grid-template-columns: 500px 1fr;
  gap: 48px;
  align-items: start;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-lg) 0;
}

.product-gallery {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  z-index: 1;
}

.product-main-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: white;
  margin-bottom: var(--space-md);
  cursor: zoom-in;
  border: 1px solid var(--gray-200);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.product-main-image img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.product-main-image:hover img {
  transform: scale(1.5);
}

.product-thumbnails {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
}

.product-thumbnail {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--transition-fast);
}

.product-thumbnail.active,
.product-thumbnail:hover {
  border-color: var(--primary);
}

.product-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-detail-info {
  padding-top: var(--space-sm);
}

.product-detail-info h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: var(--space-md);
  line-height: 1.3;
  color: var(--gray-900);
}

.product-detail-price {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg) var(--space-xl);
  background: linear-gradient(135deg, #fef2f2, #fff1f2);
  border-radius: var(--radius-lg);
  border: 1px solid #fecdd3;
}

.product-detail-price .current-price {
  font-size: 32px;
  font-weight: 800;
  color: var(--danger);
}

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

.spec-selector {
  margin-bottom: var(--space-xl);
}

.spec-group {
  margin-bottom: var(--space-lg);
}

.spec-group label {
  display: block;
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-sm);
  color: var(--gray-700);
}

.spec-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.spec-option {
  padding: 8px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  background: white;
}

.spec-option:hover:not(.disabled) {
  border-color: var(--primary);
  color: var(--primary);
}

.spec-option.selected {
  border-color: var(--primary);
  background: var(--primary-50);
  color: var(--primary);
  font-weight: var(--font-weight-medium);
}

.spec-option.disabled {
  background: var(--gray-50);
  color: var(--gray-400);
  cursor: not-allowed;
  text-decoration: line-through;
}

.quantity-control {
  display: inline-flex;
  align-items: center;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.quantity-control button {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--gray-50);
  cursor: pointer;
  font-size: 18px;
  color: var(--gray-600);
  transition: all var(--transition-fast);
}

.quantity-control button:hover {
  background: var(--gray-100);
}

.quantity-control input {
  width: 60px;
  height: 40px;
  border: none;
  text-align: center;
  font-weight: var(--font-weight-medium);
  outline: none;
}

/* ============ Cart Layout ============ */
.cart-mobile {
  display: none;
}

.cart-desktop {
  display: block;
}

/* ============ Checkout Steps ============ */
.checkout-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.checkout-step {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.checkout-step .step-number {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--gray-200);
  color: var(--gray-500);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  transition: all var(--transition-base);
}

.checkout-step.active .step-number {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.checkout-step.completed .step-number {
  background: var(--success);
  color: white;
}

.checkout-step .step-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-400);
}

.checkout-step.active .step-label {
  color: var(--gray-800);
}

.step-connector {
  width: 40px;
  height: 2px;
  background: var(--gray-200);
  margin: 0 var(--space-xs);
}

.step-connector.active {
  background: var(--primary);
}

/* Payment Methods */
.payment-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-md);
}

.payment-method-card {
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.payment-method-card:hover {
  border-color: var(--primary-light);
}

.payment-method-card.selected {
  border-color: var(--primary);
  background: var(--primary-50);
  box-shadow: 0 0 0 3px var(--primary-100);
}

.payment-method-card .method-icon {
  font-size: 32px;
  margin-bottom: var(--space-sm);
}

.payment-method-card .method-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.payment-detail-panel {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-top: var(--space-lg);
}

.qrcode-display {
  width: 200px;
  height: 200px;
  background: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--space-lg) auto;
  border: 1px solid var(--gray-200);
}

.qrcode-display img {
  max-width: 180px;
  max-height: 180px;
}

/* Payment Info Grid */
.payment-info-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.payment-info-item {
  background: white;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-100);
}

.payment-info-label {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  margin-bottom: 4px;
}

.payment-info-value-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.payment-info-value {
  font-weight: 600;
  color: var(--gray-800);
  font-size: var(--font-size-sm);
  word-break: break-all;
  overflow-wrap: break-word;
  min-width: 0;
  flex: 1;
}

.payment-info-mono {
  font-family: monospace;
  letter-spacing: 0.5px;
}

.payment-info-break {
  word-break: break-all;
  font-size: var(--font-size-xs);
  line-height: 1.4;
}

/* Payment Copy Button */
.copy-btn {
  background: var(--primary-50);
  color: var(--primary);
  border: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-xs);
  font-weight: 500;
  transition: all 0.2s;
  flex-shrink: 0;
  white-space: nowrap;
}

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

/* ============ Toast Notifications ============ */
.toast-container {
  position: fixed;
  top: calc(var(--header-height) + var(--space-md));
  right: var(--space-lg);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 300px;
  animation: slideInRight 0.3s ease;
  border-left: 4px solid var(--primary);
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

/* ============ Breadcrumb ============ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--gray-500);
  margin-bottom: var(--space-xl);
}

.breadcrumb a {
  color: var(--gray-500);
}

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

.breadcrumb .separator {
  color: var(--gray-300);
}

.breadcrumb .current {
  color: var(--gray-800);
  font-weight: var(--font-weight-medium);
}

/* ============ Loading Skeleton ============ */
.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-50) 50%, var(--gray-100) 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; }
}

/* ============ User Sidebar ============ */
.user-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-xl);
}

.user-sidebar {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  overflow: hidden;
}

.user-profile-card {
  text-align: center;
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--primary-50), #f0e6ff);
}

.user-profile-card .user-avatar {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-md);
  overflow: hidden;
  border: 3px solid white;
  box-shadow: var(--shadow-md);
}

.user-profile-card .user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-profile-card .user-name {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
}

.sidebar-nav {
  padding: var(--space-sm);
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 16px;
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  margin-bottom: 2px;
}

.sidebar-nav a:hover {
  background: var(--gray-50);
  color: var(--gray-900);
}

.sidebar-nav a.active {
  background: var(--primary-50);
  color: var(--primary);
  font-weight: var(--font-weight-medium);
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-detail-layout {
    grid-template-columns: 1fr;
  }

  .product-gallery {
    position: static;
  }

  .user-layout {
    grid-template-columns: 1fr;
  }

  .user-sidebar {
    order: -1;
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 产品页面布局 */
.products-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-xl);
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .products-layout {
    grid-template-columns: 1fr !important;
    gap: var(--space-md) !important;
  }

  /* 导航栏 */
  .nav-links {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: var(--space-md);
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--gray-100);
    z-index: 999;
  }

  .nav-links.show {
    display: flex;
  }

  .nav-links a {
    padding: 12px 16px;
    font-size: var(--font-size-base);
  }

  .mobile-menu-btn {
    display: block;
  }

  /* 幻灯片 - 手机端 */
  .hero-carousel {
    margin-bottom: var(--space-lg);
  }

  .carousel-wrapper {
    min-height: 200px;
    border-radius: var(--radius-lg);
    margin: 0;
    overflow: hidden;
  }

  .carousel-slide {
    min-height: 200px;
    padding: var(--space-lg) var(--space-md);
    align-items: center;
  }

  .carousel-slide.active {
    display: flex;
  }

  .carousel-content {
    padding: 0;
    max-width: 100%;
    width: 100%;
    position: relative;
    z-index: 2;
  }

  .carousel-content h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-sm);
    line-height: 1.3;
  }

  .carousel-content p {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
    line-height: 1.5;
  }

  .carousel-content .btn {
    padding: 8px 20px;
    font-size: var(--font-size-sm);
  }

  .carousel-image {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 45%;
    object-fit: cover;
    opacity: 0.9;
  }

  .carousel-dots {
    bottom: var(--space-sm);
    z-index: 3;
  }

  /* 分类 - 手机端4个一排圆形填满 */
  .category-grid-mobile {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    text-align: center;
    margin-bottom: var(--space-xl);
    padding: 0 var(--space-sm);
  }

  .category-grid-mobile .category-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: var(--gray-700);
  }

  .category-grid-mobile .category-circle {
    width: 100%;
    aspect-ratio: 1;
    max-width: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-50), #f0e6ff);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    transition: all var(--transition-fast);
    border: 2px solid var(--primary-100);
    overflow: hidden;
  }

  .category-grid-mobile .category-circle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
  }

  .category-grid-mobile .category-circle .icon {
    width: 28px;
    height: 28px;
  }

  .category-grid-mobile .category-item:active .category-circle {
    transform: scale(0.95);
    background: var(--primary);
    color: white;
  }

  .category-grid-mobile .category-name {
    font-size: 11px;
    font-weight: var(--font-weight-medium);
    line-height: 1.2;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  /* 隐藏桌面端分类，显示手机端分类 */
  .category-grid-desktop {
    display: none;
  }

  .category-grid-mobile {
    display: grid;
  }

  /* 商品网格 - 手机端2列 */
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .product-card .product-info {
    padding: var(--space-sm);
  }

  .product-card .product-name {
    font-size: var(--font-size-sm);
    -webkit-line-clamp: 2;
    min-height: 2.4em;
  }

  .product-card .product-price {
    font-size: var(--font-size-base);
  }

  .product-card .product-price-row {
    flex-wrap: wrap;
    gap: 2px;
  }

  .product-card .product-original-price {
    font-size: var(--font-size-xs);
  }

  .product-card .add-cart-btn {
    padding: 6px 8px;
    font-size: var(--font-size-xs);
    margin-top: var(--space-xs);
  }

  .product-card .product-actions {
    opacity: 1;
    transform: translateX(0);
  }

  .product-card .product-actions button {
    width: 30px;
    height: 30px;
  }

  /* 商品详情 - 手机端 */
  .product-detail-layout {
    grid-template-columns: 1fr !important;
    gap: var(--space-lg);
    padding: 0 !important;
  }

  .product-gallery {
    position: static !important;
    top: auto !important;
  }

  .product-main-image {
    border-radius: var(--radius-md);
    overflow: hidden;
  }

  .product-main-image img {
    transform: none !important;
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: contain;
    background: var(--gray-50);
  }

  .product-thumbnails {
    gap: 6px;
    padding: 0 var(--space-sm);
  }

  .product-thumbnail {
    width: 56px;
    height: 56px;
  }

  .product-detail-info {
    padding: 0 var(--space-sm);
  }

  .product-detail-info h1 {
    font-size: var(--font-size-xl);
    word-break: break-word;
  }

  .product-detail-price {
    padding: var(--space-md);
    flex-wrap: wrap;
  }

  .product-detail-price .current-price {
    font-size: var(--font-size-2xl);
  }

  .spec-option {
    padding: 6px 12px;
    font-size: var(--font-size-xs);
  }

  .quantity-control button {
    width: 36px;
    height: 36px;
  }

  .quantity-control input {
    width: 48px;
    height: 36px;
  }

  /* 购物车 - 手机端 */
  .cart-layout-mobile {
    grid-template-columns: 1fr !important;
    gap: var(--space-md) !important;
  }

  .cart-summary {
    position: static !important;
  }

  /* 支付方式 - 手机端 */
  .payment-methods {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  /* 购物车手机端 */
  .cart-layout {
    grid-template-columns: 1fr !important;
    gap: var(--space-md) !important;
  }

  .cart-desktop {
    display: none !important;
  }

  .cart-mobile {
    display: block !important;
  }

  .cart-layout > div:last-child .card {
    position: static !important;
  }

  .payment-method-card {
    padding: var(--space-md);
  }

  .payment-method-card .method-icon .icon {
    width: 24px;
    height: 24px;
  }

  /* 页脚 - 手机端 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* 结算步骤 - 手机端 */
  .checkout-steps {
    flex-wrap: wrap;
    gap: var(--space-xs);
    justify-content: center;
  }

  .checkout-step .step-label {
    font-size: var(--font-size-xs);
  }

  .step-connector {
    width: 20px;
  }

  /* 结算地址卡片手机端 */
  .checkout-address-grid {
    grid-template-columns: 1fr !important;
  }

  /* 支付详情面板手机端 */
  .payment-detail-panel {
    padding: var(--space-md);
  }

  .payment-detail-panel .grid-2 {
    grid-template-columns: 1fr;
  }

  /* 支付信息手机端 */
  .payment-info-item {
    padding: var(--space-sm);
  }

  .payment-info-value {
    font-size: var(--font-size-xs);
  }

  .payment-info-mono {
    font-size: 11px;
    letter-spacing: 0;
  }

  .copy-btn {
    padding: 4px 8px;
    font-size: 11px;
  }

  .payment-detail img[alt="Payment QR Code"] {
    width: 150px !important;
    height: 150px !important;
  }

  /* 网格 - 手机端 */
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .grid-3 {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  /* 分类网格 - 保持4列 */
  .grid-4.category-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .category-grid-desktop {
    display: none !important;
  }

  .category-grid-mobile {
    display: grid !important;
  }

  .section-title {
    margin-bottom: var(--space-xl);
  }

  .section-title h2 {
    font-size: var(--font-size-xl);
  }

  .section-title p {
    font-size: var(--font-size-sm);
  }

  /* 卡片 */
  .card-body {
    padding: var(--space-md);
    overflow: hidden;
  }

  .card-header {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }

  /* 表格 - 手机端 */
  .data-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  /* 用户中心 */
  .user-layout {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .user-layout > div {
    min-width: 0;
    overflow: hidden;
  }

  .user-sidebar {
    order: -1;
  }

  /* 面包屑 */
  .breadcrumb {
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-md);
  }

  /* 筛选栏 */
  .filter-bar {
    padding: var(--space-md);
    gap: var(--space-sm);
  }

  .filter-bar .form-group {
    min-width: 100%;
  }

  /* 侧边栏筛选 - 手机端隐藏 */
  .products-sidebar {
    display: none;
    grid-column: 1 / -1;
  }

  .products-sidebar.mobile-show {
    display: block;
  }

  .products-main {
    grid-column: 1 / -1;
  }

  .mobile-filter-toggle {
    display: block !important;
  }

  /* 表格 - 手机端 */
  .data-table {
    font-size: var(--font-size-xs);
  }

  .data-table th,
  .data-table td {
    padding: 8px 10px;
  }

  /* 空状态 */
  .empty-state {
    padding: var(--space-xl) var(--space-md);
  }

  .empty-state .icon {
    width: 48px;
    height: 48px;
  }

  .empty-state h3 {
    font-size: var(--font-size-lg);
  }

  /* 特性卡片 */
  .features-grid {
    grid-template-columns: 1fr !important;
    gap: var(--space-md);
  }

  .features-grid .card {
    padding: var(--space-md) !important;
  }

  .features-grid .card h3 {
    font-size: var(--font-size-base);
  }

  .features-grid .card p {
    font-size: var(--font-size-sm);
  }

  /* 用户仪表盘 - 手机端 */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .stat-card {
    padding: var(--space-md);
  }

  .stat-card .stat-icon {
    width: 40px;
    height: 40px;
  }

  .stat-card .stat-icon .icon {
    width: 20px;
    height: 20px;
  }

  .stat-card .stat-value {
    font-size: var(--font-size-lg);
  }

  .stat-card .stat-label {
    font-size: var(--font-size-xs);
  }

  /* 订单卡片 - 手机端 */
  .order-card {
    padding: var(--space-md);
    margin-bottom: var(--space-sm);
  }

  .order-card .order-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .order-card .order-items {
    flex-wrap: wrap;
  }

  .order-card .order-item {
    width: 48px;
    height: 48px;
  }

  /* 按钮 - 手机端 */
  .btn-xl {
    padding: 10px 16px;
    font-size: var(--font-size-sm);
  }

  .btn-lg {
    padding: 8px 14px;
    font-size: var(--font-size-sm);
  }

  /* 表单 - 手机端 */
  .form-row {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .form-input,
  .form-select,
  .form-textarea {
    font-size: 16px; /* 防止 iOS 缩放 */
  }

  /* 地址卡片 - 手机端 */
  .address-card {
    padding: var(--space-md);
  }

  /* 折叠面板 - 手机端 */
  .collapse-header {
    padding: var(--space-md);
  }

  .collapse-title {
    font-size: var(--font-size-sm);
  }

  .collapse-body {
    padding: var(--space-md);
  }

  /* 标签页 - 手机端 */
  .tabs {
    gap: 0;
    margin-bottom: var(--space-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  .tabs::-webkit-scrollbar {
    display: none;
  }

  .tab-item {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-xs);
    flex-shrink: 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-sm);
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .product-card .product-image {
    padding-top: 110%;
  }

  .product-card .product-info {
    padding: 8px;
  }

  .product-card .product-name {
    font-size: 12px;
    margin-bottom: 4px;
  }

  .product-card .product-price {
    font-size: var(--font-size-sm);
  }

  .product-card .add-cart-btn {
    padding: 5px 6px;
    font-size: 11px;
  }

  /* 幻灯片更小屏幕 */
  .carousel-wrapper {
    min-height: 160px;
  }

  .carousel-slide {
    min-height: 160px;
    padding: var(--space-md);
  }

  .carousel-content h2 {
    font-size: var(--font-size-lg);
  }

  .carousel-image {
    width: 40%;
    opacity: 0.8;
  }

  /* 分类圆形更小 */
  .category-grid-mobile .category-circle {
    max-width: 60px;
  }

  .category-grid-mobile .category-name {
    font-size: 10px;
  }

  /* 步骤更紧凑 */
  .checkout-step .step-number {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }

  .checkout-step .step-label {
    font-size: 11px;
  }
}

/* ============ Copy Button ============ */
.btn-copy {
  padding: 4px 12px;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-md);
  background: var(--white);
  color: var(--gray-600);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-copy:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-50);
}

.btn-copy.btn-success {
  border-color: var(--success);
  color: var(--success);
  background: #ecfdf5;
}

/* ============ Upload Preview ============ */
.upload-preview {
  margin-top: var(--space-sm);
}

.upload-preview img {
  border: 1px solid var(--gray-200);
}

/* ============ Floating Cart Button (Mobile) ============ */
.floating-cart-btn {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 16px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  border: none;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.5);
  cursor: pointer;
  z-index: 9999;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.floating-cart-btn:active {
  transform: scale(0.9);
}

.floating-cart-btn .icon {
  width: 24px;
  height: 24px;
}

.floating-cart-btn .cart-count {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 20px;
  height: 20px;
  border-radius: 10px;
  background: var(--danger);
  color: white;
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  border: 2px solid white;
}

@media (max-width: 768px) {
  .floating-cart-btn {
    display: flex !important;
  }

  .mobile-cart-float {
    display: flex !important;
  }
}

/* ============ SVG Icons ============ */
.icon {
  display: inline-block;
  vertical-align: middle;
  width: 1em;
  height: 1em;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 24px; height: 24px; }
.icon-xl { width: 32px; height: 32px; }
.icon-2xl { width: 48px; height: 48px; }
.icon-3xl { width: 64px; height: 64px; }

/* Icon with text alignment */
.icon-inline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.icon-inline .icon {
  width: 18px;
  height: 18px;
}

/* Button icon */
.btn .icon {
  width: 18px;
  height: 18px;
}

/* Badge icon */
.badge .icon {
  width: 14px;
  height: 14px;
}

/* Nav icon */
.nav-icon .icon,
.admin-nav .icon {
  width: 20px;
  height: 20px;
  opacity: 0.8;
}

/* Empty state icon */
.empty-state .icon {
  width: 64px;
  height: 64px;
  color: var(--gray-400);
  margin-bottom: var(--space-lg);
}

/* Stat card icon */
.stat-icon .icon {
  width: 28px;
  height: 28px;
}

/* Payment method icon */
.method-icon .icon {
  width: 32px;
  height: 32px;
}

/* Header nav icon */
.site-header .nav-links a .icon {
  width: 18px;
  height: 18px;
}

/* ============ Auth Pages ============ */
.auth-page {
  min-height: calc(100vh - var(--header-height) - 200px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-md);
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--gray-200);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-sm);
}

.auth-logo {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.auth-logo-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-700);
}

.auth-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.auth-header h1 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--gray-900);
  margin-bottom: var(--space-xs);
}

.auth-header p {
  font-size: var(--font-size-sm);
  color: var(--gray-500);
}

.auth-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
  font-size: var(--font-size-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-field label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
}

.auth-field input {
  height: 40px;
  width: 100%;
  padding: 0 var(--space-md);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--gray-900);
  background: var(--white);
  transition: all var(--transition-fast);
  outline: none;
}

.auth-field input::placeholder {
  color: var(--gray-400);
}

.auth-field input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.auth-field-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.auth-link {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  text-decoration: none;
}

.auth-link:hover {
  color: var(--primary);
  text-decoration: underline;
}

.auth-btn {
  width: 100%;
  height: 40px;
  background: var(--gray-900);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-top: var(--space-sm);
}

.auth-btn:hover {
  background: var(--gray-800);
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-200);
}

.auth-divider span {
  font-size: var(--font-size-xs);
  color: var(--gray-400);
  white-space: nowrap;
}

.auth-social {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.auth-social-btn {
  width: 100%;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.auth-social-btn:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

.auth-footer {
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  margin-top: var(--space-xl);
}

.auth-footer a {
  color: var(--gray-900);
  font-weight: var(--font-weight-medium);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

@media (max-width: 480px) {
  .auth-card {
    padding: var(--space-lg);
    border: none;
    box-shadow: none;
    background: transparent;
  }

  .auth-page {
    padding: var(--space-md);
  }
}