/* ==========================================================================
   RO-MESH Strategic Backbone & Infrastructure Fleet Registry
   Modern UI Overhaul - Generous Spacing, Margins & Padding
   ========================================================================== */

.backbone-page {
  padding: 36px 44px;
  max-width: 1560px;
  margin: 0 auto;
  min-height: calc(100vh - 70px);
  color: var(--text, #e2e8f0);
}

/* ==========================================================================
   Header & Banner
   ========================================================================== */
.backbone-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.backbone-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.backbone-title {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text, #f8fafc);
}

.backbone-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted, #94a3b8);
  margin: 0;
  max-width: 840px;
  line-height: 1.55;
}

.backbone-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ==========================================================================
   KPI Summary Stat Cards
   ========================================================================== */
.backbone-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.backbone-kpi-card {
  background: var(--surface-1, rgba(15, 23, 42, 0.7));
  border: 1px solid var(--border, rgba(148, 163, 184, 0.16));
  border-radius: 14px;
  padding: 22px 26px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.backbone-kpi-card:hover {
  transform: translateY(-3px);
  border-color: rgba(148, 163, 184, 0.35);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
}

.backbone-kpi-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--kpi-accent, #38bdf8);
}

.backbone-kpi-card.national::before {
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.backbone-kpi-card.county::before {
  background: linear-gradient(90deg, #0284c7, #38bdf8);
}

.backbone-kpi-card.suggestions::before {
  background: linear-gradient(90deg, #8b5cf6, #c084fc);
}

.backbone-kpi-card.coverage::before {
  background: linear-gradient(90deg, #10b981, #34d399);
}

.backbone-kpi-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted, #94a3b8);
  display: flex;
  align-items: center;
  gap: 8px;
}

.backbone-kpi-val {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text, #f8fafc);
  line-height: 1.1;
  margin: 2px 0;
}

.backbone-kpi-sub {
  font-size: 0.8rem;
  color: var(--text-muted, #64748b);
  line-height: 1.35;
}

/* ==========================================================================
   Section Containers
   ========================================================================== */
.backbone-section {
  background: var(--surface-2, rgba(15, 23, 42, 0.5));
  border: 1px solid var(--border, rgba(148, 163, 184, 0.14));
  border-radius: 16px;
  padding: 32px 36px;
  margin-bottom: 44px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.22);
}

.backbone-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.backbone-section-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text, #f8fafc);
  letter-spacing: -0.015em;
}

.backbone-section-desc {
  font-size: 0.9rem;
  color: var(--text-muted, #94a3b8);
  margin-top: 6px;
  margin-bottom: 0;
  line-height: 1.45;
}

/* ==========================================================================
   Filter Controls Toolbar
   ========================================================================== */
.backbone-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
  background: rgba(15, 23, 42, 0.4);
  padding: 16px 22px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.backbone-filter-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.backbone-tab-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(148, 163, 184, 0.2);
  color: var(--text-muted, #94a3b8);
  font-size: 0.86rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.backbone-tab-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text, #fff);
  border-color: rgba(148, 163, 184, 0.4);
}

.backbone-tab-btn.active {
  background: rgba(56, 189, 248, 0.18);
  border-color: #38bdf8;
  color: #38bdf8;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.backbone-search-input {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(148, 163, 184, 0.25);
  color: var(--text, #fff);
  font-size: 0.88rem;
  padding: 9px 16px;
  border-radius: 8px;
  min-width: 280px;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.backbone-search-input:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.25);
}

.backbone-select {
  background: var(--surface-1, #0f172a);
  border: 1px solid rgba(148, 163, 184, 0.25);
  color: var(--text, #f1f5f9);
  font-size: 0.88rem;
  padding: 9px 14px;
  border-radius: 8px;
  outline: none;
  cursor: pointer;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.backbone-select:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.25);
}

/* ==========================================================================
   County Accordion & Hierarchical Groups
   ========================================================================== */
.backbone-county-accordion-wrap {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.backbone-county-group {
  background: var(--surface-1, rgba(15, 23, 42, 0.7));
  border: 1px solid var(--border, rgba(148, 163, 184, 0.16));
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.backbone-county-group:hover {
  border-color: rgba(148, 163, 184, 0.32);
}

.backbone-county-group.national {
  border-left: 5px solid #f59e0b;
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.05) 0%, rgba(15, 23, 42, 0.75) 100%);
}

.backbone-county-group.county {
  border-left: 5px solid #0284c7;
}

.backbone-county-group.unassigned {
  border-left: 5px solid #f59e0b;
  border-style: dashed;
}

.backbone-county-group.candidate-national {
  border-left: 5px solid #fbbf24;
}

.backbone-county-group.candidate-county {
  border-left: 5px solid #38bdf8;
}

.backbone-county-group.candidate-other {
  border-left: 5px solid #94a3b8;
}

.backbone-county-header {
  padding: 18px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(15, 23, 42, 0.45);
  cursor: pointer;
  user-select: none;
  transition: background 0.18s ease;
}

.backbone-county-header:hover {
  background: rgba(255, 255, 255, 0.05);
}

.backbone-county-title {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text, #f8fafc);
  flex-wrap: wrap;
}

.county-flag {
  font-size: 1.35rem;
  line-height: 1;
}

.county-name {
  letter-spacing: -0.015em;
}

.backbone-county-count {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 16px;
  background: rgba(148, 163, 184, 0.12);
  color: var(--text-muted, #94a3b8);
  border: 1px solid rgba(148, 163, 184, 0.22);
}

.backbone-county-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.backbone-toggle-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  color: var(--text-muted, #94a3b8);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.backbone-county-group.collapsed .backbone-toggle-icon {
  transform: rotate(-90deg);
}

.backbone-county-body {
  border-top: 1px solid var(--border, rgba(148, 163, 184, 0.12));
}

.backbone-county-group.collapsed .backbone-county-body {
  display: none;
}

/* ==========================================================================
   Fleet List Table - Generous Breathing Room
   ========================================================================== */
.backbone-table-wrap {
  width: 100%;
  overflow-x: auto;
}

.backbone-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.backbone-table thead th {
  padding: 14px 24px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted, #64748b);
  border-bottom: 1px solid var(--border, rgba(148, 163, 184, 0.14));
  background: rgba(0, 0, 0, 0.18);
}

.backbone-row {
  border-bottom: 1px solid var(--border, rgba(148, 163, 184, 0.09));
  transition: background 0.15s ease;
}

.backbone-row:last-child {
  border-bottom: none;
}

.backbone-row:hover {
  background: rgba(255, 255, 255, 0.04);
}

.backbone-table td {
  padding: 18px 24px;
  vertical-align: middle;
}

/* Table Cells */
.backbone-node-cell {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-icon {
  font-size: 1.35rem;
  flex-shrink: 0;
}

.node-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.node-name {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text, #f8fafc);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 300px;
}

.node-hex-copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: monospace;
  font-size: 0.74rem;
  color: #64748b;
  cursor: pointer;
  padding: 3px 8px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 4px;
  transition: color 0.15s ease, border-color 0.15s ease;
  width: fit-content;
}

.node-hex-copy:hover {
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.4);
}

/* Telemetry Pills */
.telemetry-pill-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.telemetry-health {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text, #cbd5e1);
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.2);
}

.health-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  box-shadow: 0 0 8px currentColor;
}

.telemetry-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-muted, #94a3b8);
  background: rgba(0, 0, 0, 0.25);
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  white-space: nowrap;
}

/* Candidate Heuristic Badge */
.candidate-reason-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.35);
  color: #d8b4fe;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  max-width: 360px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Badges */
.backbone-badge {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 5px 10px;
  border-radius: 6px;
  text-transform: uppercase;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.backbone-badge.national {
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.45);
}

.backbone-badge.county {
  background: rgba(2, 132, 199, 0.18);
  color: #38bdf8;
  border: 1px solid rgba(2, 132, 199, 0.45);
}

.backbone-badge.candidate {
  background: rgba(139, 92, 246, 0.18);
  color: #c084fc;
  border: 1px solid rgba(139, 92, 246, 0.45);
}

/* Action Buttons */
.backbone-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(148, 163, 184, 0.22);
  color: var(--text, #cbd5e1);
  font-size: 0.86rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.backbone-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text, #fff);
  border-color: rgba(148, 163, 184, 0.45);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.backbone-btn.small {
  padding: 6px 12px;
  font-size: 0.78rem;
  border-radius: 6px;
  gap: 6px;
}

.backbone-btn.primary {
  background: #0284c7;
  border-color: #0ea5e9;
  color: #fff;
}

.backbone-btn.primary:hover {
  background: #0369a1;
  box-shadow: 0 0 12px rgba(14, 165, 233, 0.35);
}

.backbone-btn.gold {
  background: rgba(245, 158, 11, 0.18);
  border-color: rgba(245, 158, 11, 0.45);
  color: #fbbf24;
}

.backbone-btn.gold:hover {
  background: rgba(245, 158, 11, 0.32);
  color: #fef3c7;
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.25);
}

.backbone-btn.danger {
  background: rgba(239, 68, 68, 0.14);
  border-color: rgba(239, 68, 68, 0.35);
  color: #f87171;
}

.backbone-btn.danger:hover {
  background: rgba(239, 68, 68, 0.28);
  color: #fca5a5;
  box-shadow: 0 0 12px rgba(239, 68, 68, 0.25);
}

.backbone-btn-icon {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(148, 163, 184, 0.2);
  color: var(--text-muted, #94a3b8);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.18s ease;
}

.backbone-btn-icon:hover {
  border-color: #38bdf8;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.12);
}

.backbone-btn-icon svg {
  width: 15px;
  height: 15px;
}

/* Suggestion Section */
.suggestion-section {
  border: 1px solid rgba(139, 92, 246, 0.3);
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.04), rgba(15, 23, 42, 0.65));
}

.candidate-header {
  background: rgba(139, 92, 246, 0.1);
}

/* Empty State */
.backbone-empty {
  text-align: center;
  padding: 56px 24px;
  color: var(--text-muted, #94a3b8);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.backbone-empty svg {
  width: 52px;
  height: 52px;
  opacity: 0.45;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .backbone-page {
    padding: 20px 16px;
  }
  .backbone-section {
    padding: 20px 16px;
  }
  .backbone-filter-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 14px 16px;
  }
  .backbone-search-input {
    width: 100%;
    min-width: 0;
  }
  .backbone-table th,
  .backbone-table td {
    padding: 14px 16px;
  }
  .backbone-county-header {
    padding: 14px 18px;
  }
}