/* ============================================================
   minimal-ui.css — Minimal Mode site-wide redesign
   §1 Design-system layer · §2 Per-surface redesign
   Loaded LAST in index.html so it overrides styles.css.
   Tokens are --mu-* prefixed to avoid colliding with the
   existing :root brand variables in styles.css.
   ============================================================ */

/* ===== §1 Design system ===== */
:root {
  --mu-bg: #000000;
  --mu-surface: #0b0c0e;
  --mu-surface-2: #121419;
  --mu-border: rgba(255,255,255,.08);
  --mu-border-strong: rgba(255,255,255,.14);
  --mu-accent: #3b82f6;
  --mu-climb: #22c55e;
  --mu-cruise: #3b82f6;
  --mu-descend: #f97316;
  --mu-taxi: #fbbf24;
  --mu-text: #e6e8eb;
  --mu-text-2: #9aa3b2;
  --mu-muted: #5a6473;
  --mu-dot: #454c5c;
  --mu-r-pill: 999px;
  --mu-r-card: 18px;
}

/* dotted-grid background utility */
.mu-dotgrid {
  background-color: var(--mu-bg);
  background-image: radial-gradient(var(--mu-dot) .8px, transparent .8px);
  background-size: 26px 26px;
  background-position: -13px -13px;
}

/* pill primitive */
.mu-pill {
  border-radius: var(--mu-r-pill);
  border: 1px solid var(--mu-border);
  background: var(--mu-surface);
  color: var(--mu-text);
}

/* ===== §2 Per-surface redesign (added task by task below) ===== */

/* ===== §2.2 Loading screen — Hub Constellation ===== */
#loadingOverlay {
  background: var(--mu-bg);
}
#loadingOverlay .loading-grid { display: none; }
#loadingOverlay .loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}
#loadingOverlay .loading-logo-icon {
  width: 38px;
  height: 38px;
  margin: 0;
  filter: none;
  opacity: .9;
}
#loadingOverlay .loading-logo {
  margin-top: 14px;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: .22em;
  color: var(--mu-text);
  text-shadow: none;
}
#loadingOverlay .loading-logo-sub {
  margin-top: 5px;
  font-size: 10px;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#loadingOverlay .loading-constellation {
  margin-top: 30px;
  width: min(620px, 86vw);
}
#loadingOverlay .loading-constellation svg {
  display: block;
  width: 100%;
  height: auto;
}
#loadingOverlay .loading-text {
  margin-top: 28px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .01em;
  color: var(--mu-text);
}
#loadingOverlay .loading-subtext {
  margin-top: 5px;
  font-size: 12px;
  color: var(--mu-text-2);
}
#loadingOverlay .loading-progress-track {
  margin-top: 20px;
  width: 220px;
  height: 2px;
  background: var(--mu-border);
  border-radius: var(--mu-r-pill);
  overflow: hidden;
}
#loadingOverlay .loading-progress-bar {
  height: 100%;
  width: 38%;
  background: var(--mu-accent);
  border-radius: var(--mu-r-pill);
  animation: muLoadProgress 1.4s ease-in-out infinite;
}
@keyframes muLoadProgress {
  0%   { transform: translateX(-120%); }
  100% { transform: translateX(380%); }
}

#loadingOverlay .loading-hub-legend {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}
#loadingOverlay .loading-hub-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#loadingOverlay .lhc-dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  display: block;
}
#loadingOverlay .lhc-dot--loaded { background: var(--mu-climb); }
#loadingOverlay .lhc-dot--active { background: var(--mu-accent); }
#loadingOverlay .lhc-dot--pending { background: var(--mu-dot); }

/* ===== §2.3 Header bar — translucent floating ===== */
#headerBar.header-bar {
  top: 10px;
  left: 10px;
  right: 10px;
  height: 54px;
  padding: 0 10px;
  background: rgba(11, 12, 14, .6);
  -webkit-backdrop-filter: blur(22px) saturate(1.4);
  backdrop-filter: blur(22px) saturate(1.4);
  border: 1px solid var(--mu-border);
  border-radius: 16px;
  box-shadow: 0 10px 34px rgba(0, 0, 0, .5);
}
#headerBar .header-left { gap: 10px; }
#headerBar .sidebar-toggle { border-radius: var(--mu-r-pill); }
#headerBar .sidebar-toggle:hover { background: rgba(255, 255, 255, .06); }
#headerBar .hamburger-line { width: 16px; background: var(--mu-text-2); }
#headerBar .header-brand { gap: 10px; }
#headerBar .brand-logo { width: 26px; height: 26px; }
#headerBar .brand-text h1 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--mu-text);
}
#headerBar .brand-text h1 .brand-accent {
  color: var(--mu-text);
  font-weight: 600;
}
#headerBar .brand-tagline {
  font-size: 9px;
  letter-spacing: .12em;
  color: var(--mu-muted);
}
#headerBar .connection-status {
  padding: 5px 11px;
  background: rgba(34, 197, 94, .08);
  border: 1px solid rgba(34, 197, 94, .2);
  border-radius: var(--mu-r-pill);
  font-size: 10px;
  letter-spacing: .12em;
}
#headerBar .header-right { gap: 2px; }
#headerBar .header-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 10px;
  background: transparent;
  border: none;
  border-radius: var(--mu-r-pill);
  font-size: 11px;
  font-weight: 500;
  color: var(--mu-text-2);
  cursor: pointer;
  transition: background .15s, color .15s;
}
#headerBar .header-btn:hover {
  background: rgba(255, 255, 255, .06);
  color: var(--mu-text);
}
#headerBar .header-btn svg { width: 13px; height: 13px; }
#headerBar .header-time {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  padding: 0 8px;
  cursor: pointer;
}
#headerBar .header-time .time-label {
  font-size: 8px;
  letter-spacing: .14em;
  color: var(--mu-muted);
}
#headerBar .header-time .time-value {
  font-size: 11px;
  color: var(--mu-text-2);
  font-variant-numeric: tabular-nums;
}

/* ===== §2.4 Live status bar — icon-led ===== */
#liveStatusBar {
  gap: 0;
  padding: 0;
  background: rgba(13, 15, 18, .92);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, .55);
  overflow: hidden;
}
#liveStatusBar .lsb-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 13px;
}
#liveStatusBar .lsb-icon {
  width: 13px;
  height: 13px;
  color: var(--mu-muted);
}
#liveStatusBar .lsb-glyph {
  font-size: 11px;
  line-height: 1;
}
#liveStatusBar .lsb-glyph--climb { color: var(--mu-climb); }
#liveStatusBar .lsb-glyph--cruise { color: var(--mu-cruise); }
#liveStatusBar .lsb-glyph--descend { color: var(--mu-descend); }
#liveStatusBar .lsb-glyph--taxi { color: var(--mu-taxi); }
#liveStatusBar .lsb-value {
  font-size: 13px;
  font-weight: 300;
  color: var(--mu-text);
}
#liveStatusBar #lsbClimbing { color: var(--mu-climb); }
#liveStatusBar #lsbCruising { color: var(--mu-cruise); }
#liveStatusBar #lsbDescending { color: var(--mu-descend); }
#liveStatusBar #lsbTaxiing { color: var(--mu-taxi); }
#liveStatusBar .lsb-label {
  font-size: 9px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#liveStatusBar .lsb-sep {
  width: 1px;
  height: 18px;
  background: var(--mu-border);
}

/* ===== §2.5 Sidebar / flight list — mini route arc ===== */
#sidebar {
  background: var(--mu-surface);
  border-right: 1px solid var(--mu-border);
}
#sidebar .sidebar-header { border-bottom: 1px solid var(--mu-border); }
#sidebar .sidebar-header h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--mu-text);
}
#sidebar .flight-count-badge {
  background: rgba(59, 130, 246, .12);
  border: 1px solid rgba(59, 130, 246, .3);
  color: var(--mu-accent);
  border-radius: var(--mu-r-pill);
  font-size: 11px;
}
#sidebar .sort-select {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
  color: var(--mu-text-2);
  font-size: 11px;
}
#sidebar .search-input {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: 10px;
  color: var(--mu-text);
  font-size: 12px;
}
#sidebar .search-input::placeholder { color: var(--mu-muted); }
#sidebar .filter-chip {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
  color: var(--mu-text-2);
  font-size: 11px;
}
#sidebar .filter-chip:hover { color: var(--mu-text); }
#sidebar .filter-chip.active {
  background: var(--mu-accent);
  border-color: var(--mu-accent);
  color: #fff;
}
#sidebar .flight-entry {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, .05);
}
#sidebar .flight-entry::before { display: none; }
#sidebar .flight-entry:hover { background: rgba(255, 255, 255, .025); }
#sidebar .flight-entry.selected { background: rgba(59, 130, 246, .1); }
#sidebar .flight-entry-icon {
  width: 30px;
  flex-shrink: 0;
  color: var(--mu-muted);
}
#sidebar .flight-entry-info { flex: 1; min-width: 0; }
#sidebar .flight-entry-callsign {
  font-size: 13px;
  font-weight: 600;
  color: var(--mu-text);
}
#sidebar .flight-entry-type-badge {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
  color: var(--mu-text-2);
  font-size: 9px;
  letter-spacing: .04em;
}
#sidebar .flight-entry-route {
  font-size: 10px;
  color: var(--mu-text-2);
  letter-spacing: .03em;
}
#sidebar .flight-entry-stats {
  font-size: 10px;
  color: var(--mu-muted);
}
#sidebar .flight-entry-arc {
  flex-shrink: 0;
  width: 60px;
  height: 34px;
}
#sidebar .flight-entry-arc svg { width: 100%; height: 100%; display: block; }

/* ===== §2.6 Flight detail panel — mini dotted-globe ===== */
#flightDetail.flight-detail {
  background: var(--mu-surface);
  border: 1px solid var(--mu-border);
}
#flightDetail .detail-header { border-bottom: 1px solid var(--mu-border); }
#flightDetail .detail-flight-number {
  font-size: 20px;
  font-weight: 700;
  color: var(--mu-text);
}
#flightDetail .detail-aircraft-badge {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
  color: var(--mu-text-2);
  font-size: 11px;
}
#flightDetail .close-detail-btn { color: var(--mu-text-2); }
#flightDetail .route-code { color: var(--mu-text); }
#flightDetail .route-label,
#flightDetail .route-full-name { color: var(--mu-muted); }
#flightDetail .detail-mini-globe {
  height: 158px;
  margin: 14px 0;
  border: 1px solid var(--mu-border);
  border-radius: 14px;
  background: radial-gradient(ellipse 80% 80% at 50% 50%, rgba(59, 130, 246, .05), transparent 70%), #0a0c10;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
#flightDetail .detail-mini-globe::after {
  content: "Position Context";
  position: absolute;
  bottom: 8px;
  left: 12px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#flightDetail .detail-mini-globe svg {
  height: 100%;
  width: auto;
  display: block;
}
#flightDetail .progress-bar { background: var(--mu-border); }
#flightDetail .progress-fill { background: var(--mu-accent); }
#flightDetail .detail-card {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: 12px;
}
#flightDetail .detail-card-label {
  color: var(--mu-muted);
  font-size: 9px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
#flightDetail .detail-card-value {
  color: var(--mu-text);
  font-size: 19px;
  font-weight: 300;
}
#flightDetail .detail-card-unit { color: var(--mu-muted); }
#flightDetail .detail-row { border-bottom: 1px solid var(--mu-border); }
#flightDetail .detail-row-label { color: var(--mu-muted); }
#flightDetail .detail-row-value { color: var(--mu-text-2); }
#flightDetail .follow-btn,
#flightDetail .watch-btn,
#flightDetail .detail-quick-btn {
  border-radius: var(--mu-r-pill);
  border: 1px solid var(--mu-border);
  background: var(--mu-surface-2);
  color: var(--mu-text-2);
}
#flightDetail .follow-btn {
  background: var(--mu-accent);
  border-color: var(--mu-accent);
  color: #fff;
}

/* ===== §2.7 Stats dashboard ===== */
#statsModal .stats-kpi-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-bottom: 1px solid var(--mu-border);
}
#statsModal .stats-kpi {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  border-right: 1px solid var(--mu-border);
}
#statsModal .stats-kpi:last-child { border-right: none; }
#statsModal .stats-kpi-value {
  font-size: 22px;
  font-weight: 200;
  letter-spacing: -.02em;
  color: var(--mu-text);
}
#statsModal .stats-kpi-label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#statsModal .stats-modal-backdrop { background: rgba(0, 0, 0, .72); }
#statsModal .stats-modal-content {
  background: var(--mu-surface);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-card);
}
#statsModal .stats-modal-header { border-bottom: 1px solid var(--mu-border); }
#statsModal .stats-modal-header h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--mu-text);
}
#statsModal .stats-modal-close {
  color: var(--mu-text-2);
  border-radius: var(--mu-r-pill);
}
#statsModal .stats-modal-close:hover { background: rgba(255, 255, 255, .06); }
#statsModal .stats-card {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: 14px;
}
#statsModal .stats-card-title {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#statsModal .stats-list-item { border-bottom: 1px solid rgba(255, 255, 255, .05); }
#statsModal .stats-list-item-label { color: var(--mu-text-2); }
#statsModal .stats-list-item-value { color: var(--mu-text); }
#statsModal .stat-range-label { color: var(--mu-muted); }
#statsModal .stat-range-value { color: var(--mu-text); }
#statsModal .stats-hourly-section,
#statsModal .stats-hub-matrix-section { border-top: 1px solid var(--mu-border); }
#statsModal .progress-bar { background: var(--mu-border); }
#statsModal .progress-fill { background: var(--mu-accent); }

/* ===== §2.8 Layers panel ===== */
#layersPanel {
  background: rgba(11, 12, 14, .94);
  border: 1px solid var(--mu-border);
  border-radius: 14px;
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}
#layersPanel .layers-panel-section-label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#layersPanel .view-mode-toggle {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
}
#layersPanel .view-mode-pill {
  border-radius: var(--mu-r-pill);
  color: var(--mu-text-2);
  font-size: 11px;
}
#layersPanel .view-mode-pill.active {
  background: var(--mu-accent);
  color: #fff;
}
#layersPanel .map-style-option {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: 8px;
  color: var(--mu-text-2);
  font-size: 11px;
}

/* Icon grid layout */
.layer-icon-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-top: 6px;
  margin-bottom: 4px;
}
.layer-icon-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

/* Each toggle cell */
#layersPanel .layer-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 9px 4px 8px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, .06);
  background: rgba(255, 255, 255, .02);
  cursor: pointer;
  transition: border-color .15s, background .15s;
  text-align: center;
}
#layersPanel .layer-cell:hover {
  background: rgba(255, 255, 255, .05);
  border-color: rgba(255, 255, 255, .1);
}

/* Hide the native checkbox visually, keep it in DOM */
#layersPanel .layer-cell input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 0;
  height: 0;
}

/* Icon inherits color — muted when off, accent when on */
.layer-cell-icon {
  color: var(--mu-muted);
  flex-shrink: 0;
  transition: color .15s;
}
.layer-cell-label {
  font-size: 8.5px;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--mu-muted);
  line-height: 1.3;
  transition: color .15s;
}

/* ON state — accent fill */
#layersPanel .layer-cell:has(input:checked) {
  border-color: rgba(59, 130, 246, .35);
  background: rgba(59, 130, 246, .08);
}
#layersPanel .layer-cell:has(input:checked) .layer-cell-icon {
  color: var(--mu-accent);
}
#layersPanel .layer-cell:has(input:checked) .layer-cell-label {
  color: var(--mu-accent);
}

#layersPanel .layer-legend { color: var(--mu-muted); }

/* ===== §2.9 Hub detail modal — editorial ===== */
#hubModal .hub-modal-backdrop { background: rgba(0, 0, 0, .72); }
#hubModal .hub-modal-content {
  background: var(--mu-surface);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-card);
  position: relative;
}
#hubModal .hub-ghost {
  position: absolute;
  top: 2px;
  right: 26px;
  font-size: 130px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.04em;
  color: rgba(255, 255, 255, .03);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}
#hubModal .hub-modal-header {
  border-bottom: 1px solid var(--mu-border);
  position: relative;
  z-index: 1;
}
#hubModal .hub-modal-header h2 {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--mu-text);
}
#hubModal .hub-subtitle {
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#hubModal .hub-modal-close {
  color: var(--mu-text-2);
  border-radius: var(--mu-r-pill);
}
#hubModal .hub-summary-bar,
#hubModal .hub-metar-card {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: 12px;
}
#hubModal .hub-flights-col h3 {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mu-muted);
}
#hubModal .hub-col-count { color: var(--mu-accent); }
#hubModal .hub-flight-list { color: var(--mu-text-2); }
#hubModal .hub-aircraft-breakdown { border-top: 1px solid var(--mu-border); }

/* ===== §2.10 Bottom stats bar — translucent floating ===== */
#statsBar.stats-bar {
  left: 0;
  right: 0;
  bottom: 12px;
  margin-inline: auto;
  width: max-content;
  padding: 0;
  background: rgba(11, 12, 14, .72);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--mu-border);
  border-top: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
  box-shadow: 0 8px 30px rgba(0, 0, 0, .5);
}
#statsBar .stat-item {
  padding: 13px 22px 10px;
  position: relative;
}
#statsBar .stat-icon { display: none; }
#statsBar .stat-item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 22px;
  right: 22px;
  height: 2px;
  border-radius: 2px;
}
#statsBar .stat-item:nth-child(1)::before { background: var(--mu-cruise); box-shadow: 0 0 8px var(--mu-cruise); }
#statsBar .stat-item:nth-child(3)::before { background: var(--mu-climb); box-shadow: 0 0 8px var(--mu-climb); }
#statsBar .stat-item:nth-child(5)::before { background: var(--mu-descend); box-shadow: 0 0 8px var(--mu-descend); }
#statsBar .stat-item:nth-child(7)::before { background: var(--mu-taxi); box-shadow: 0 0 8px var(--mu-taxi); }
#statsBar .stat-value {
  color: var(--mu-text);
  font-weight: 600;
}
#statsBar .stat-label {
  color: var(--mu-muted);
  font-size: 9px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
#statsBar .stat-divider { background: var(--mu-border); }

/* ===== §2.11 Notifications & toasts ===== */
#notificationPanel.notification-panel {
  background: rgba(11, 12, 14, .96);
  border: 1px solid var(--mu-border);
  border-radius: 14px;
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}
#notificationPanel .notification-panel-header { border-bottom: 1px solid var(--mu-border); }
#notificationPanel .notification-panel-header h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--mu-text);
}
#notificationPanel .alert-rule-select,
#notificationPanel .alert-rule-input {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: 8px;
  color: var(--mu-text);
  font-size: 11px;
}
#notificationPanel .alert-rule-add-btn {
  background: var(--mu-accent);
  border: none;
  border-radius: var(--mu-r-pill);
  color: #fff;
  font-size: 11px;
}
#notificationPanel .alert-rule-item {
  background: var(--mu-surface-2);
  border: 1px solid var(--mu-border);
  border-radius: var(--mu-r-pill);
  color: var(--mu-text-2);
}
#notificationPanel .notification-item { border-bottom: 1px solid rgba(255, 255, 255, .05); }
#notificationPanel .notification-empty,
#notificationPanel .alert-rule-empty { color: var(--mu-muted); }

/* ===== §2.12 Desktop nav rail ===== */
body.layout-a nav.nav-rail {
  background: var(--mu-bg);
  border-right: 1px solid var(--mu-border);
}
body.layout-a .nav-rail .nav-rail-btn { color: var(--mu-muted); }
body.layout-a .nav-rail .nav-rail-btn:hover {
  color: var(--mu-text-2);
  background: rgba(255, 255, 255, .04);
}
body.layout-a .nav-rail .nav-rail-btn.active {
  color: var(--mu-accent);
  background: rgba(59, 130, 246, .1);
}

/* ===== §2.13 Mobile dock bar ===== */
body.layout-c div.dock-bar {
  background: rgba(11, 12, 14, .92);
  border-top: 1px solid var(--mu-border);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}
body.layout-c .dock-bar .dock-btn { color: var(--mu-muted); }
body.layout-c .dock-bar .dock-btn.active { color: var(--mu-accent); }