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

:root {
  --bg: #f0f4f8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --white: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --sidebar-bg: #1e293b;
  --sidebar-text: #cbd5e1;
  --sidebar-active: #2563eb;
  --sidebar-width: 240px;
  --topbar-height: 60px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --radius: 8px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

/* ===== Layout ===== */
#app {
  display: flex;
  min-height: 100vh;
}

/* ===== Sidebar ===== */
#sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.logo-icon { font-size: 24px; }

.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: var(--sidebar-text);
  font-size: 24px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}
.sidebar-close:hover { background: rgba(255,255,255,0.1); }

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  color: var(--sidebar-text);
  font-size: 14px;
  transition: all var(--transition);
  border-left: 3px solid transparent;
  text-decoration: none;
  cursor: pointer;
}

.nav-item:hover {
  background: rgba(255,255,255,0.05);
  color: #fff;
  text-decoration: none;
}

.nav-item.active {
  background: rgba(37,99,235,0.15);
  color: #fff;
  border-left-color: var(--sidebar-active);
}

.nav-icon { font-size: 18px; width: 24px; text-align: center; }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
}

.user-avatar { font-size: 20px; }

/* ===== Sidebar Overlay ===== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 99;
}

/* ===== Main Content ===== */
#mainContent {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Topbar ===== */
.topbar {
  height: var(--topbar-height);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text);
  padding: 4px 8px;
}

.topbar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  flex: 1;
}

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

.topbar-time {
  font-size: 13px;
  color: var(--text-secondary);
}

.topbar-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--danger);
  color: #fff;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.topbar-badge:hover { background: #dc2626; }

/* ===== Page Container ===== */
.page-container {
  flex: 1;
  padding: 24px;
}

.page {
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Cards ===== */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 20px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
}

.card-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.card-link {
  font-size: 13px;
  color: var(--primary);
  text-decoration: none;
}
.card-link:hover { text-decoration: underline; }

.header-info {
  font-size: 13px;
  color: var(--text-secondary);
}

.card-body {
  padding: 20px;
}

/* ===== Stat Cards ===== */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: box-shadow var(--transition);
}
.stat-card:hover {
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}
.stat-icon.blue { background: #eff6ff; }
.stat-icon.green { background: #ecfdf5; }
.stat-icon.orange { background: #fffbeb; }
.stat-icon.purple { background: #f5f3ff; }

.stat-info { flex: 1; }
.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.stat-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
}
.stat-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ===== Dashboard Grid ===== */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

/* ===== Donut Chart ===== */
.chart-donut-container {
  display: flex;
  align-items: center;
  gap: 30px;
}

.chart-donut {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
  background: conic-gradient(
    var(--donut-colors, #2563eb 0% 0%)
  );
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-donut::after {
  content: '';
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--white);
  position: absolute;
}

.chart-donut-inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.chart-donut-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  display: block;
}

.chart-donut-label {
  font-size: 12px;
  color: var(--text-secondary);
}

.chart-legend {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.legend-text {
  flex: 1;
  color: var(--text);
}

.legend-count {
  color: var(--text-secondary);
  font-size: 12px;
}

/* ===== Low Stock List ===== */
.low-stock-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 320px;
  overflow-y: auto;
}

.low-stock-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: #fef2f2;
  border-radius: var(--radius-sm);
  gap: 12px;
}

.low-stock-info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.low-stock-icon { font-size: 20px; flex-shrink: 0; }

.low-stock-name {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.low-stock-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}

.low-stock-meta span { white-space: nowrap; }

.stock-status {
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
}
.stock-status.warning { background: #fef3c7; color: #d97706; }
.stock-status.danger { background: #fee2e2; color: #dc2626; }

.low-stock-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 40px;
  font-size: 14px;
}

/* ===== Data Table ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-table thead th {
  background: #f8fafc;
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background var(--transition);
}

.data-table tbody tr:hover {
  background: #f8fafc;
}

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

.data-table .clickable {
  color: var(--primary);
  cursor: pointer;
  font-weight: 500;
}
.data-table .clickable:hover { text-decoration: underline; }

/* Type badges */
.type-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}
.type-badge.inbound { background: #ecfdf5; color: #059669; }
.type-badge.outbound { background: #fef3c7; color: #d97706; }

/* ===== Forms ===== */
.form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group input,
.form-group select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-actions {
  display: flex;
  gap: 10px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

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

.btn-secondary {
  background: var(--border);
  color: var(--text);
}
.btn-secondary:hover { background: #cbd5e1; }

.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-danger:hover { background: #dc2626; }

.btn-sm {
  padding: 5px 12px;
  font-size: 12px;
}

.btn-back {
  margin-bottom: 16px;
  background: var(--white);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.btn-back:hover { background: #f8fafc; }

.btn-link {
  background: none;
  color: var(--primary);
  padding: 4px 6px;
  font-size: 13px;
}
.btn-link:hover { text-decoration: underline; }

/* ===== Page Grid ===== */
.page-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
  align-items: flex-end;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.filter-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.filter-group input,
.filter-group select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  min-width: 150px;
}

.filter-group input:focus,
.filter-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.pagination button {
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: var(--white);
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text);
  min-width: 36px;
}

.pagination button:hover:not(:disabled) {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.pagination button.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

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

.pagination-info {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 8px;
}

/* ===== Detail Page ===== */
.product-detail-header {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 24px;
}

.product-detail-image {
  width: 80px;
  height: 80px;
  background: var(--bg);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  flex-shrink: 0;
}

.product-detail-info { flex: 1; }

.product-detail-name {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
}

.product-detail-sku {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.product-detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.meta-label {
  font-size: 12px;
  color: var(--text-muted);
}

.meta-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* ===== Bar Chart ===== */
.chart-bar-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chart-bar-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chart-bar-label {
  width: 100px;
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
  text-align: right;
  flex-shrink: 0;
}

.chart-bar-track {
  flex: 1;
  height: 24px;
  background: var(--border-light);
  border-radius: 12px;
  overflow: hidden;
  position: relative;
}

.chart-bar-fill {
  height: 100%;
  border-radius: 12px;
  transition: width 0.6s ease;
  display: flex;
  align-items: center;
  padding-left: 10px;
  font-size: 12px;
  color: #fff;
  font-weight: 600;
  min-width: 30px;
}

.chart-bar-value {
  width: 50px;
  font-size: 13px;
  color: var(--text-secondary);
  flex-shrink: 0;
  text-align: left;
}

.bar-colors {
  --bar-0: #2563eb;
  --bar-1: #3b82f6;
  --bar-2: #60a5fa;
  --bar-3: #93c5fd;
  --bar-4: #f59e0b;
  --bar-5: #fbbf24;
  --bar-6: #10b981;
  --bar-7: #34d399;
}

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: slideIn 0.3s ease;
  max-width: 360px;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(50px); }
}

/* ===== Misc ===== */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.font-bold { font-weight: 600; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 14px;
}

/* Stock status colors in table */
.stock-level {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
}
.stock-level.normal { color: #059669; }
.stock-level.warning { color: #d97706; }
.stock-level.danger { color: #dc2626; }

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

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

.toggle-slider {
  position: absolute;
  inset: 0;
  background: #cbd5e1;
  border-radius: 24px;
  transition: all 0.3s ease;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: all 0.3s ease;
}

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

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

/* ===== Action Buttons In Table ===== */
.action-btns {
  display: flex;
  gap: 6px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .stat-cards { grid-template-columns: repeat(2, 1fr); }
  .dashboard-grid { grid-template-columns: 1fr; }
  .page-grid { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
}

@media (max-width: 768px) {
  #sidebar {
    transform: translateX(-100%);
  }
  #sidebar.open {
    transform: translateX(0);
  }

  .sidebar-close { display: block; }
  .sidebar-overlay.show { display: block; }

  .hamburger { display: block; }

  #mainContent {
    margin-left: 0;
  }

  .stat-cards { grid-template-columns: 1fr; }

  .topbar { padding: 0 16px; }

  .page-container { padding: 16px; }

  .chart-donut-container {
    flex-direction: column;
    align-items: center;
  }

  .filter-bar { flex-direction: column; }

  .filter-group input,
  .filter-group select {
    min-width: 100%;
  }

  .product-detail-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .product-detail-meta { justify-content: center; }
}

@media (max-width: 480px) {
  .stat-cards { grid-template-columns: 1fr; }

  .topbar-actions { gap: 8px; }
  .topbar-time { display: none; }
}