:root {
  --bg-main: #0b1120;
  --bg-card: #111827;
  --bg-card-elevated: #1e293b;
  --border-color: #26334d;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-blue: #38bdf8;
  --accent-indigo: #6366f1;
  --color-excellent: #10b981;
  --color-good: #22c55e;
  --color-fair: #f59e0b;
  --color-weak: #f97316;
  --color-dead: #ef4444;
  --font-sans: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  --font-mono: "Cascadia Code", "Consolas", monospace;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.45;
  padding-bottom: 40px;
}

/* Header & Top Controls */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.pulse-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-excellent);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 1.6s infinite;
}

.pulse-dot.paused {
  background: var(--color-fair);
  animation: none;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card-elevated);
  padding: 5px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  font-size: 0.82rem;
}

.control-group select {
  background: transparent;
  color: var(--text-main);
  border: none;
  font-weight: 600;
  cursor: pointer;
  outline: none;
}

.control-group select option {
  background: var(--bg-card);
  color: var(--text-main);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 13px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn:hover {
  border-color: var(--accent-blue);
  background: #27354d;
}

.btn.active-toggle {
  background: rgba(56, 189, 248, 0.18);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.btn-primary {
  background: var(--accent-indigo);
  border-color: var(--accent-indigo);
  color: #fff;
}

.btn-primary:hover {
  background: #4f46e5;
  border-color: #4f46e5;
}

.btn-warning {
  background: #d97706;
  border-color: #f59e0b;
  color: #fff;
  white-space: nowrap;
}

.btn-warning:hover {
  background: #b45309;
}

/* Location Notice Banner */
.location-banner {
  margin: 14px 24px 0;
  padding: 12px 18px;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.45);
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
}

.location-banner.hidden {
  display: none;
}

/* Main Dashboard Grid */
.dashboard {
  max-width: 1560px;
  margin: 18px auto 0;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.grid-top {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 18px;
}

.grid-two-col {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 18px;
}

.stack-col {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

@media (max-width: 1120px) {
  .grid-top,
  .grid-two-col {
    grid-template-columns: 1fr;
  }
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 18px 20px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.card-header h2 {
  font-size: 1.05rem;
  font-weight: 700;
}

.card-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Signal HUD */
.hud-main {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.gauge-wrap {
  position: relative;
  width: 220px;
  text-align: center;
  flex-shrink: 0;
  margin: 0 auto;
}

.gauge-readout {
  margin-top: -28px;
}

.rssi-value {
  font-size: 2.3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
}

.rssi-value .unit {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.pct-value {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
}

.quality-badge {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--bg-card-elevated);
}

.hud-metrics {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(150px, 1fr));
  gap: 10px;
}

.metric-box {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 9px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metric-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.metric-val {
  font-size: 0.95rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mono {
  font-family: var(--font-mono);
}

/* Room / Waypoint Tagging */
.active-room-pill {
  background: rgba(99, 102, 241, 0.16);
  border: 1px solid var(--accent-indigo);
  color: #c7d2fe;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.83rem;
}

.room-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.room-btn {
  padding: 11px 10px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-card-elevated);
  color: var(--text-main);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}

.room-btn:hover {
  border-color: var(--accent-blue);
  transform: translateY(-1px);
}

.room-btn.active {
  background: linear-gradient(135deg, #4f46e5, #0284c7);
  border-color: var(--accent-blue);
  color: #fff;
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.25);
}

.custom-room-form {
  display: flex;
  gap: 8px;
}

.custom-room-form input {
  flex: 1;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text-main);
  font-size: 0.85rem;
  outline: none;
}

.custom-room-form input:focus {
  border-color: var(--accent-blue);
}

/* Timeline Chart */
.chart-legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  display: inline-block;
}

.swatch-rssi { background: #38bdf8; }
.swatch-speed { background: #a855f7; }
.swatch-good { background: rgba(34, 197, 94, 0.45); }
.swatch-weak { background: rgba(239, 68, 68, 0.45); }

.canvas-container {
  width: 100%;
  overflow: hidden;
}

#timelineCanvas {
  width: 100%;
  height: 250px;
  display: block;
  background: #090e1a;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

/* Floorplan Heatmap */
.heatmap-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.heatmap-canvas-wrap {
  position: relative;
  width: 100%;
  background: #090e1a;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  cursor: crosshair;
}

#heatmapCanvas {
  width: 100%;
  height: auto;
  display: block;
}

.heatmap-scale {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.gradient-bar {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #ef4444 0%, #f97316 25%, #f59e0b 50%, #22c55e 75%, #10b981 100%);
}

/* Data Tables */
.table-wrap {
  max-height: 230px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 10px;
}

.roam-table-wrap {
  max-height: 175px;
}

.neighbor-table-wrap {
  max-height: 265px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.data-table th,
.data-table td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid rgba(38, 51, 77, 0.65);
}

.data-table th {
  position: sticky;
  top: 0;
  background: var(--bg-card-elevated);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.data-table tr:hover td {
  background: rgba(30, 41, 59, 0.55);
}

.empty-cell {
  text-align: center !important;
  color: var(--text-muted);
  padding: 20px !important;
}

.pill-count,
.band-pill {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
}

.neighbor-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.channel-chart-box h3 {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

#channelCanvas {
  width: 100%;
  height: 235px;
  background: #090e1a;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  display: block;
}

/* Room Header Actions & Speed Test Banner */
.room-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.76rem;
}

.speedtest-banner {
  margin-bottom: 12px;
  padding: 9px 14px;
  border-radius: 9px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.4);
  font-size: 0.83rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.speedtest-banner.hidden {
  display: none;
}

/* Smart Mesh & Router Placement Advisor */
.advisor-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.advisor-item {
  padding: 10px 14px;
  border-radius: 10px;
  border-left: 4px solid var(--accent-blue);
  background: var(--bg-card-elevated);
  font-size: 0.82rem;
}

.advisor-item strong {
  display: block;
  margin-bottom: 3px;
  font-size: 0.86rem;
}

.advisor-item.critical {
  border-left-color: var(--color-dead);
  background: rgba(239, 68, 68, 0.1);
}

.advisor-item.warning {
  border-left-color: var(--color-fair);
  background: rgba(245, 158, 11, 0.1);
}

.advisor-item.good {
  border-left-color: var(--color-excellent);
  background: rgba(16, 185, 129, 0.1);
}

.advisor-item.info {
  border-left-color: var(--accent-blue);
}