:root {
  --bg-main: #050608;
  --bg-surface: #0E1117;
  --bg-surface-elevated: #151A22;
  --border-color: #1B202A;
  --border-focus: #3B82F6;
  --accent-color: #3B82F6;
  --accent-hover: #2563EB;
  --accent-subtle: rgba(59, 130, 246, 0.12);
  --text-main: #F3F4F6;
  --text-secondary: #9CA3AF;
  --text-muted: #6B7280;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  font-size: 14px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* App Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
  width: 240px;
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.brand {
  padding: 20px 18px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  font-size: 24px;
  color: var(--accent-color);
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.3px;
}

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

.nav-menu {
  list-style: none;
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.nav-item:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-main);
}

.nav-item.active {
  background-color: var(--accent-subtle);
  color: var(--accent-color);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.nav-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  font-size: 11px;
  color: var(--text-muted);
}

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

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-muted);
}

.dot.online {
  background-color: var(--success);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.4);
}

.dot.offline {
  background-color: var(--danger);
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.top-bar {
  height: 56px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.page-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
}

.top-bar-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.api-endpoint-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 4px;
  color: var(--text-secondary);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--text-secondary);
}

.btn-primary {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: white;
}

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

.content-container {
  padding: 24px;
  flex: 1;
}

/* Common UI Elements */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.metric-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.metric-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.metric-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-mono);
}

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

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 24px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

/* Tables */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}

table.data-table th {
  background-color: var(--bg-surface-elevated);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

table.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

table.data-table tr:hover td {
  background-color: var(--bg-surface-elevated);
}

table.data-table tr.clickable {
  cursor: pointer;
}

/* Dice Badges */
.dice-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  font-weight: 700;
  font-size: 11px;
  color: var(--text-main);
  margin-right: 4px;
  font-family: var(--font-mono);
}

.total-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 12px;
  font-family: var(--font-mono);
  background-color: var(--accent-subtle);
  color: var(--accent-color);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Transition Matrix Grid */
.matrix-container {
  overflow-x: auto;
  margin-top: 12px;
}

.matrix-table {
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 11px;
}

.matrix-table th, .matrix-table td {
  border: 1px solid var(--border-color);
  width: 44px;
  height: 36px;
  text-align: center;
  vertical-align: middle;
}

.matrix-table th {
  background-color: var(--bg-surface-elevated);
  color: var(--text-secondary);
  font-weight: 600;
}

.matrix-table td.cell-data {
  cursor: pointer;
  transition: outline 0.1s;
}

.matrix-table td.cell-data:hover {
  outline: 2px solid var(--accent-color);
  z-index: 10;
}

/* Charts */
.chart-container {
  width: 100%;
  height: 280px;
  position: relative;
  margin: 16px 0;
}

/* Alert Boxes */
.alert-box {
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border: 1px solid var(--warning);
  color: #FCD34D;
}

.alert-info {
  background-color: var(--accent-subtle);
  border: 1px solid var(--accent-color);
  color: #93C5FD;
}

/* Pagination Controls */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}

.pagination-controls {
  display: flex;
  gap: 8px;
}

/* Responsive */
@media (max-width: 900px) {
  .app-layout {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
}