:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  --secondary: #0f172a;
  --accent: #10b981;
  --accent-hover: #059669;
  --bg-main: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --radius: 14px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 28px rgba(0,0,0,0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  padding-bottom: 90px;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
  transition: all 0.2s ease;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-logo {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  color: white;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.brand-info h1 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--secondary);
}

.brand-info p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-icon {
  background: #f1f5f9;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: all 0.2s;
  color: var(--text-main);
}

.btn-icon:hover {
  background: var(--primary-light);
  border-color: var(--primary-border);
  color: var(--primary);
}

.cart-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: #ef4444;
  color: white;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 10px;
  border: 2px solid white;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);
  color: white;
  border-radius: 20px;
  padding: 28px 24px;
  margin: 18px 0;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 70%);
  border-radius: 50%;
}

.hero h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.hero p {
  font-size: 0.9rem;
  opacity: 0.9;
  max-width: 600px;
  margin-bottom: 18px;
}

.hero-stats {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.stat-pill {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(5px);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Controls / Search / Filter */
.search-filter-bar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

@media (min-width: 640px) {
  .search-filter-bar {
    flex-direction: row;
    align-items: center;
  }
}

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

.search-input-wrapper input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  font-size: 0.95rem;
  outline: none;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.search-input-wrapper input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.category-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.category-scroll::-webkit-scrollbar {
  display: none;
}

.cat-chip {
  padding: 8px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.cat-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.cat-chip.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  font-weight: 600;
}

/* Status Bar */
.sync-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f1f5f9;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 0.8rem;
  margin-bottom: 18px;
}

.sync-status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
}

.dot.offline {
  background: #f59e0b;
}

/* Product Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

@media (min-width: 768px) {
  .products-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.product-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  position: relative;
}

.product-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-border);
}

.product-img-wrapper {
  position: relative;
  width: 100%;
  height: 140px;
  background: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

@media (min-width: 768px) {
  .product-img-wrapper {
    height: 180px;
  }
}

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

.product-img-placeholder {
  font-size: 2.2rem;
  color: var(--primary);
  opacity: 0.6;
}

.product-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(15, 23, 42, 0.85);
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  backdrop-filter: blur(4px);
}

.product-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.product-category {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.product-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 6px;
  color: var(--secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 2.6em;
}

.product-price-row {
  margin-top: auto;
  padding-top: 8px;
  display: flex;
  flex-direction: column;
}

.product-price {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--primary);
}

.product-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.product-actions {
  margin-top: 10px;
  display: flex;
  gap: 6px;
}

.btn-add-cart {
  flex: 1;
  background: var(--primary);
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background 0.2s;
}

.btn-add-cart:hover {
  background: var(--primary-hover);
}

.btn-calc {
  background: #f1f5f9;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-calc:hover {
  background: var(--primary-light);
  border-color: var(--primary-border);
  color: var(--primary);
}

/* Floating Bottom Bar (Mobile Cart) */
.mobile-cart-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  border-top: 1px solid var(--border-color);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 -4px 16px rgba(0,0,0,0.08);
  z-index: 40;
}

.cart-summary-text h4 {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.cart-summary-text p {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
}

.btn-checkout-float {
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-checkout-float:hover {
  background: var(--accent-hover);
}

/* Drawer & Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: 18px;
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  padding: 20px;
  position: relative;
}

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

.modal-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

/* Form Styles */
.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  outline: none;
}

.form-control:focus {
  border-color: var(--primary);
}

/* Cart Items in Drawer */
.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
}

.cart-item-info h5 {
  font-size: 0.9rem;
  font-weight: 700;
}

.cart-item-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.qty-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-qty {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: #f8fafc;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 40px 16px;
  color: var(--text-muted);
}

.empty-state svg {
  width: 56px;
  height: 56px;
  margin-bottom: 12px;
  color: #cbd5e1;
}

/* Toast */
.toast-notice {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--secondary);
  color: white;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 200;
  box-shadow: var(--shadow-lg);
  display: none;
  animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translate(-50%, -10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}