:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --border-color: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --ml-yellow: #ffe600;
  --ml-blue: #2d3277;
  --success: #16a34a;
  --success-bg: #dcfce7;
  --danger: #dc2626;
  --danger-bg: #fee2e2;
  --radius: 12px;
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.06);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.06);
  --shadow-lg: 0 10px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.08);
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header */
.app-header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-badge {
  background: var(--ml-yellow);
  color: var(--ml-blue);
  font-weight: 800;
  font-size: 1.15rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  letter-spacing: -0.5px;
}

.brand-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.3px;
}

.env-badge {
  background: #f1f5f9;
  color: var(--text-muted);
  font-size: 0.725rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
}

.brand .subtitle {
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  margin: 1.75rem 0 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  overflow-x: auto;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: none;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.65rem 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-main);
  background-color: rgba(0,0,0,0.04);
}

.tab-btn.active {
  color: var(--primary);
  background-color: #eff6ff;
  font-weight: 600;
}

.badge-counter {
  background: #dbeafe;
  color: var(--primary);
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Section Toolbar */
.section-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.section-toolbar h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.section-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* Products Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.product-image-wrap {
  width: 100%;
  height: 220px;
  background-color: #ffffff;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid #f1f5f9;
  padding: 1.25rem;
}

.product-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.product-card:hover .product-image {
  transform: scale(1.05);
}

.product-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background: rgba(15, 23, 42, 0.75);
  color: #ffffff;
  backdrop-filter: blur(4px);
  padding: 0.2rem 0.55rem;
  font-size: 0.725rem;
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.product-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text-main);
  text-decoration: none;
}

.product-title:hover {
  color: var(--primary);
}

.price-container {
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid #f1f5f9;
}

.price-current {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.price-currency {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.price-history-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

.product-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.825rem;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

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

.btn-secondary {
  background-color: #ffffff;
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: #f8fafc;
}

.btn-danger-outline {
  background-color: transparent;
  color: var(--danger);
  border-color: #fecaca;
}

.btn-danger-outline:hover {
  background-color: var(--danger-bg);
}

/* Search Box */
.search-box-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2.25rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.search-box-card h2 {
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
  letter-spacing: -0.3px;
}

.search-box-card .description {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.search-form .input-group {
  display: flex;
  position: relative;
  gap: 0.65rem;
}

.search-form input {
  flex-grow: 1;
  padding: 0.8rem 1.1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

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

.input-icon {
  width: 20px;
  height: 20px;
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-form .input-group:has(.input-icon) input {
  padding-left: 2.75rem;
}

/* Empty State & Loader */
.empty-state {
  text-align: center;
  padding: 4.5rem 1.5rem;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

.empty-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.empty-state h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.loader-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3.5rem 1rem;
  gap: 1rem;
  color: var(--text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid #e2e8f0;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 6px;
}

.badge-info {
  background-color: #eff6ff;
  color: var(--primary);
  border: 1px solid #bfdbfe;
}

.text-success { color: var(--success); }
.text-danger { color: var(--danger); }

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1.5rem;
}

.modal-content {
  background: #ffffff;
  border-radius: var(--radius);
  width: 100%;
  max-width: 820px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: #ffffff;
  z-index: 10;
}

.modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.modal-title-wrap h3 {
  font-size: 1.15rem;
  max-width: 550px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 1.5rem;
}

.history-summary-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: #f8fafc;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

.chart-container {
  height: 280px;
  margin-bottom: 2rem;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
}

.table-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.table-header-flex h4 {
  font-size: 1rem;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.history-table th,
.history-table td {
  padding: 0.65rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.history-table th {
  background: #f8fafc;
  color: var(--text-muted);
  font-weight: 600;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: #0f172a;
  color: #ffffff;
  padding: 0.85rem 1.35rem;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  z-index: 200;
  display: none;
  animation: slideUp 0.3s ease;
}

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

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

.app-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .history-summary-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}