:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  
  --tech-cyan: #06b6d4;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}
.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #2563eb, #06b6d4);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 18px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}
.brand-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
}
.version-tag {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.22);
  padding: 1px 7px;
  border-radius: 9999px;
  letter-spacing: 0.3px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  vertical-align: middle;
}
.brand-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

/* Tab Navigation */
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-subtle);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}
.nav-tab {
  background: transparent;
  color: var(--text-muted);
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  white-space: nowrap;
}
.nav-tab-icon {
  font-size: 15px;
}
.nav-tab:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.6);
}
.nav-tab.active {
  background: var(--bg-card);
  color: var(--primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
}

/* Status Badge */
.status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-subtle);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 12.5px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}
.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--text-light);
}
.status-dot.online {
  background-color: var(--success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
  animation: pulse 2s infinite;
}
.status-dot.offline {
  background-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.25);
}
@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Container & Tab Panes */
.container {
  max-width: 1440px;
  margin: 20px auto;
  padding: 0 24px 60px;
}
.tab-pane {
  display: block;
  animation: fadeIn 0.2s ease-in-out;
}
.tab-pane.hidden {
  display: none !important;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Metric Cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.15s;
}
.metric-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.metric-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.metric-value {
  font-size: 28px;
  font-weight: 800;
  margin-top: 8px;
  letter-spacing: -0.5px;
}
.metric-sub {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

/* Panels */
.grid-2 {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
  margin-bottom: 24px;
}
@media (max-width: 1024px) {
  .grid-2 { grid-template-columns: 1fr; }
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-sm);
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.panel-title {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Quick Nav Cards in Tab 1 */
.quick-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.quick-nav-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease-in-out;
}
.quick-nav-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}
.quick-nav-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.quick-nav-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}
.quick-nav-desc {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.4;
}
.quick-nav-arrow {
  font-size: 20px;
  color: var(--text-light);
  font-weight: 700;
  margin-left: auto;
  transition: transform 0.15s;
}
.quick-nav-card:hover .quick-nav-arrow {
  color: var(--primary);
  transform: translateX(4px);
}

/* Forms & Inputs */
.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
}
.form-col {
  flex: 1;
}
label {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}
input, select, textarea {
  width: 100%;
  padding: 9px 13px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 14px;
  background: var(--bg-card);
  color: var(--text-main);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Buttons */
button {
  cursor: pointer;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.15s, transform 0.05s;
}
button:active {
  transform: scale(0.98);
}
.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover {
  background: var(--primary-hover);
}
.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: #e2e8f0;
}
.btn-success {
  background: var(--success);
  color: white;
}
.btn-success:hover {
  background: #059669;
}
.btn-warning {
  background: #d97706;
  color: white;
}
.btn-warning:hover {
  background: #b45309;
}
.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 600;
}
.badge-pending { background: #f1f5f9; color: #64748b; }
.badge-analyzed { background: var(--success-light); color: var(--success); }
.badge-high { background: var(--danger-light); color: var(--danger); }
.badge-mid { background: var(--warning-light); color: var(--warning); }
.badge-low { background: #eff6ff; color: #3b82f6; }
.badge-sku { background: #f0fdf4; color: #166534; font-family: ui-monospace, monospace; }

/* Progress Bar */
.progress-bar-wrap {
  width: 100%;
  height: 8px;
  background: var(--bg-subtle);
  border-radius: 9999px;
  overflow: hidden;
  margin: 12px 0;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #2563eb, #06b6d4);
  width: 0%;
  transition: width 0.3s;
}

/* Data Table View */
.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.table-toolbar {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}
.table-filters-group {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.table-wrap {
  overflow-x: auto;
  max-height: 650px;
}
table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13.5px;
}
th {
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-weight: 600;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}
td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: top;
}
tr:hover td {
  background-color: #fafbfc;
}
.code-cell {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--primary);
}

/* ==================== Charts View Styles ==================== */
.chart-filter-bar {
  margin-bottom: 20px;
  padding: 18px 22px;
}
.chart-filter-inner {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
}
.chart-filter-item {
  display: flex;
  flex-direction: column;
}
.preset-btn-group {
  display: flex;
  gap: 6px;
}
.preset-btn {
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 7px 12px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.preset-btn:hover {
  background: #e2e8f0;
  color: var(--text-main);
}
.preset-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  font-weight: 600;
}

.chart-summary-strip {
  display: flex;
  gap: 24px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-color);
  font-size: 13px;
  flex-wrap: wrap;
}
.strip-item {
  display: flex;
  align-items: center;
  gap: 8px;
}
.strip-label {
  color: var(--text-muted);
}
.strip-val {
  font-weight: 700;
  font-size: 14px;
}
.text-danger { color: var(--danger) !important; }
.text-primary { color: var(--primary) !important; }

/* Chart Grids */
.charts-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 1024px) {
  .charts-grid-2 { grid-template-columns: 1fr; }
}

.charts-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 20px;
}
@media (max-width: 1200px) {
  .charts-grid-3 { grid-template-columns: 1fr; }
}

.chart-panel {
  min-height: 380px;
  display: flex;
  flex-direction: column;
}

/* Donut Chart Layout */
.chart-content-donut {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 1;
  min-height: 300px;
}
@media (max-width: 640px) {
  .chart-content-donut { flex-direction: column; }
}
.svg-chart-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
}
.donut-legend-wrap {
  width: 220px;
  max-height: 280px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.donut-legend-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
  cursor: pointer;
}
.donut-legend-item:hover {
  background: var(--bg-subtle);
}
.legend-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  display: inline-block;
  margin-right: 8px;
  flex-shrink: 0;
}

/* Horizontal Bar Chart */
.chart-bars-wrap {
  flex: 1;
  overflow-y: auto;
  max-height: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 6px;
}
.hbar-row {
  display: flex;
  align-items: center;
  font-size: 13px;
  gap: 12px;
}
.hbar-name {
  width: 140px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-shrink: 0;
}
.hbar-track {
  flex: 1;
  height: 14px;
  background: var(--bg-subtle);
  border-radius: 9999px;
  overflow: hidden;
}
.hbar-fill {
  height: 100%;
  border-radius: 9999px;
  background: linear-gradient(90deg, #2563eb, #06b6d4);
  transition: width 0.4s ease-out;
}
.hbar-val {
  min-width: 65px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
  flex-shrink: 0;
}

/* Severity & SKU & Timeline wraps */
.chart-severity-wrap, .chart-sku-wrap, .chart-timeline-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 240px;
}

/* Tooltip */
.chart-tooltip {
  position: fixed;
  pointer-events: none;
  background: rgba(15, 23, 42, 0.9);
  color: #fff;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  line-height: 1.4;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
  z-index: 9999;
  backdrop-filter: blur(4px);
  transform: translate(-50%, -100%) translateY(-10px);
  white-space: nowrap;
  transition: opacity 0.15s ease-out, transform 0.15s ease-out;
}

/* ==================== Settings View Styles ==================== */
.settings-container {
  max-width: 860px;
  margin: 0 auto;
}
.settings-card {
  padding: 24px;
}
.settings-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 14px;
}
.info-item {
  background: var(--bg-subtle);
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}
.info-label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.info-val {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  word-break: break-all;
}

/* Modal */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 620px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}
.modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-body {
  padding: 24px;
  overflow-y: auto;
}
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-subtle);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Helpers */
.hidden { display: none !important; }
.truncate { max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }