:root {
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --border-focus: #3b82f6;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --warning: #f59e0b;

  --store-vkusvill: #16a34a;
  --store-vkusvill-bg: #dcfce7;
  --store-lenta: #2563eb;
  --store-lenta-bg: #dbeafe;
  --store-pyaterochka: #dc2626;
  --store-pyaterochka-bg: #fee2e2;
  --store-magnit: #b91c1c;
  --store-magnit-bg: #fef2f2;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 10px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 12px;
  background: #e2e8f0;
  color: var(--text-muted);
}
.badge-ok { background: var(--success-bg); color: #065f46; border: 1px solid #a7f3d0; }
.badge-err { background: var(--danger-bg); color: #991b1b; border: 1px solid #fecaca; }
.badge-warn { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }

/* Header */
.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #2563eb, #10b981);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 20px;
}

.logo-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.bonus-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--success-bg);
  border: 1px solid #a7f3d0;
  color: #065f46;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.city-selector-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.city-selector-btn:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.btn-city-quick {
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 6px;
  transition: all 0.2s;
}

.btn-city-quick.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.address-chip-btn {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: var(--text-main);
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
}

.address-chip-btn:hover {
  background: #e2e8f0;
  border-color: #94a3b8;
}

.address-chip-btn.active {
  background: #f0fdf4;
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

.city-item-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.city-item-btn:hover, .city-item-btn.active {
  background: #f0fdf4;
  border-color: var(--primary);
  color: var(--primary);
}

/* Layout */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 24px;
  margin-top: 24px;
  margin-bottom: 40px;
}

/* Search Bar */
.search-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.search-form {
  display: flex;
  gap: 12px;
}

.search-input-wrap {
  flex: 1;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--primary);
}

.btn {
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #059669; }
.btn-danger { background: var(--danger); color: white; }
.btn-secondary { background: #e2e8f0; color: #334155; }
.btn-secondary:hover { background: #cbd5e1; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Filter Stores */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.store-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.store-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
}

.store-chip.active-vkusvill { background: var(--store-vkusvill-bg); color: var(--store-vkusvill); border-color: var(--store-vkusvill); }
.store-chip.active-lenta { background: var(--store-lenta-bg); color: var(--store-lenta); border-color: var(--store-lenta); }
.store-chip.active-pyaterochka { background: var(--store-pyaterochka-bg); color: var(--store-pyaterochka); border-color: var(--store-pyaterochka); }
.store-chip.active-magnit { background: var(--store-magnit-bg); color: var(--store-magnit); border-color: var(--store-magnit); }

.sort-select {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  background: white;
}

/* Products Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
}

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

.product-image-container {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  background: #f8fafc;
  border-radius: 6px;
  overflow: hidden;
}

.product-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.product-badges {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.store-tag {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
}

.tag-vkusvill { background: var(--store-vkusvill-bg); color: var(--store-vkusvill); }
.tag-lenta { background: var(--store-lenta-bg); color: var(--store-lenta); }
.tag-pyaterochka { background: var(--store-pyaterochka-bg); color: var(--store-pyaterochka); }
.tag-magnit { background: var(--store-magnit-bg); color: var(--store-magnit); }

.discount-badge {
  background: #dc2626;
  color: white;
  font-size: 11px;
  font-weight: bold;
  padding: 2px 6px;
  border-radius: 4px;
}

.product-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
  line-height: 1.3;
  min-height: 38px;
}

.product-weight {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.price-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

.current-price {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
}

.old-price {
  font-size: 14px;
  text-decoration: line-through;
  color: var(--text-muted);
}

.unit-price-badge {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}

.btn-add-cart {
  width: 100%;
  background: var(--success);
  color: white;
  padding: 10px;
  border-radius: 6px;
  border: none;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-add-cart:hover { background: #059669; }

/* Multi-Cart Sidebar */
.cart-sidebar {
  position: sticky;
  top: 90px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  max-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
}

.cart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.cart-items-scroll {
  overflow-y: auto;
  flex: 1;
  padding-right: 4px;
}

.cart-store-group {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
  background: #fafbfc;
}

.cart-store-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.cart-store-title {
  font-size: 13px;
  font-weight: 700;
}

.threshold-bar {
  background: #e2e8f0;
  border-radius: 4px;
  height: 6px;
  overflow: hidden;
  margin: 6px 0;
}

.threshold-fill {
  background: var(--success);
  height: 100%;
  width: 0%;
  transition: width 0.3s ease;
}

.threshold-text {
  font-size: 11px;
  color: var(--text-muted);
}

.cart-item-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-top: 1px solid #edf2f7;
  font-size: 13px;
}

.qty-stepper {
  display: flex;
  align-items: center;
  gap: 6px;
}

.qty-btn {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  border: 1px solid #cbd5e1;
  background: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 12px;
}

.cart-footer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 2px solid var(--border);
}

.total-row {
  display: flex;
  justify-content: space-between;
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 12px;
}

.savings-text {
  font-size: 12px;
  color: var(--success);
  font-weight: 600;
  margin-bottom: 8px;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--surface);
  border-radius: var(--radius);
  width: 100%;
  max-width: 500px;
  padding: 24px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-muted);
}

/* Toasts */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 150;
}

.toast {
  background: #1e293b;
  color: white;
  padding: 12px 18px;
  border-radius: 8px;
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
}

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

/* Responsive */
@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  .cart-sidebar {
    position: static;
    max-height: none;
  }
}