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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #0f1117;
  color: #e2e8f0;
  height: 100dvh;
  display: grid;
  grid-template-columns: 1fr 290px;
  grid-template-rows: 1fr 200px;
  overflow: hidden;
}

/* ── Left column: map (top) + diagram (bottom) ──────────────────────── */
#map-container {
  grid-column: 1;
  grid-row: 1;
  position: relative;
  min-width: 0;
  min-height: 0;
}
#map { width: 100%; height: 100%; }

#diagram-container {
  grid-column: 1;
  grid-row: 2;
  min-width: 0;
  display: flex;
  background: #0a0c14;
  border-top: 1px solid #2d3149;
}
#diagram-canvas {
  width: 100%;
  flex: 1;
  min-height: 0;
  display: block;
}

/* ── Right column: sidebar (top) + controls (bottom) ───────────────── */
#sidebar {
  grid-column: 2;
  grid-row: 1;
  background: #1a1d27;
  border-left: 1px solid #2d3149;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}
#sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
#sidebar-empty {
  color: #334155;
  font-size: 12px;
  text-align: center;
  padding: 24px 12px;
  line-height: 1.6;
}
#sidebar-add {
  flex-shrink: 0;
  padding: 8px 10px;
  border-top: 1px solid #1e2133;
}
.add-target-btn {
  background: none;
  border: 1px dashed #2d3149;
  color: #475569;
  border-radius: 5px;
  padding: 5px 10px;
  font-size: 11px;
  cursor: pointer;
  width: 100%;
  text-align: center;
  transition: all 0.15s;
}
.add-target-btn:hover { border-color: #3b5bdb; color: #93c5fd; }

#controls {
  grid-column: 2;
  grid-row: 2;
  background: #1a1d27;
  border-left: 1px solid #2d3149;
  border-top: 1px solid #2d3149;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

/* Map overlay elements */
.map-hint {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15,17,23,0.85);
  backdrop-filter: blur(6px);
  border: 1px solid #2d3149;
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 12px;
  color: #94a3b8;
  pointer-events: none;
  z-index: 1000;
  white-space: nowrap;
}
/* Target cards */
.tgt-card {
  background: #0f1117;
  border-radius: 8px;
  border: 1px solid #1e2133;
  overflow: hidden;
}
.tgt-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-bottom: 1px solid #1e2133;
}
.tgt-color-dot { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; }
.tgt-name { font-size: 12px; font-weight: 600; flex: 1; }
.tgt-remove {
  background: none; border: none; color: #334155;
  cursor: pointer; font-size: 15px; line-height: 1; padding: 0 2px;
}
.tgt-remove:hover { color: #f87171; }

.tgt-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: #1e2133;
  border-bottom: 1px solid #1e2133;
}
.tgt-input-cell {
  background: #0f1117;
  padding: 5px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.tgt-input-label { font-size: 9px; color: #475569; text-transform: uppercase; letter-spacing: 0.06em; }
.tgt-input-row { display: flex; align-items: center; gap: 4px; }
.elev-input {
  background: transparent;
  border: none;
  border-bottom: 1px solid #2d3149;
  color: #e2e8f0;
  font-size: 13px;
  font-weight: 600;
  padding: 1px 2px;
  width: 70px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.elev-input:focus { outline: none; border-bottom-color: #3b5bdb; }
.elev-unit { font-size: 10px; color: #475569; }

.tgt-stats {
  padding: 7px 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 10px;
}
.stat-item { display: flex; flex-direction: column; }
.stat-name { font-size: 9px; color: #475569; text-transform: uppercase; letter-spacing: 0.04em; }
.stat-val {
  font-size: 12px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: #e2e8f0;
  line-height: 1.3;
}
.stat-val.good { color: #4ade80; }
.stat-val.warn { color: #fb923c; }
.stat-val.bad  { color: #f87171; }
.stat-full { grid-column: 1 / -1; }

/* Controls panel */
.ctrl-section {
  padding: 9px 13px;
  border-bottom: 1px solid #1e2133;
}
.ctrl-section-title {
  font-size: 9px;
  font-weight: 600;
  color: #475569;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 7px;
}
.ctrl-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 5px;
}
.ctrl-label { font-size: 12px; color: #94a3b8; flex: 1; }

.obs-elev-input {
  background: #0f1117;
  border: 1px solid #2d3149;
  border-radius: 5px;
  color: #e2e8f0;
  font-size: 13px;
  font-weight: 600;
  padding: 4px 8px;
  width: 80px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.obs-elev-input:focus { outline: none; border-color: #3b5bdb; }

.refraction-select {
  background: #0f1117;
  border: 1px solid #2d3149;
  border-radius: 5px;
  color: #e2e8f0;
  font-size: 11px;
  padding: 3px 6px;
  cursor: pointer;
  flex: 1;
}
.refraction-select:focus { outline: none; border-color: #3b5bdb; }

/* Leaflet */
.leaflet-container { background: #0f1117; }

/* ── View tabs ───────────────────────────────────────────────────────────── */
#view-tabs {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 1001;
  display: flex;
  gap: 2px;
  background: rgba(15,17,23,0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid #2d3149;
  border-radius: 8px;
  padding: 3px;
}
.view-tab {
  background: none;
  border: none;
  color: #64748b;
  font-size: 11px;
  font-weight: 500;
  font-family: inherit;
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.view-tab:hover { color: #94a3b8; }
.view-tab.active {
  background: #1e2133;
  color: #e2e8f0;
}
.view-tab-sep {
  width: 1px;
  background: #2d3149;
  align-self: stretch;
  margin: 3px 1px;
}

/* ── Satellite toggle ────────────────────────────────────────────────────────── */
#satellite-btn {
  display: flex;
  align-items: center;
  gap: 6px;
}
.sat-label { font-size: 11px; }
.sat-spinner {
  display: none;
  width: 10px;
  height: 10px;
  border: 1.5px solid rgba(100,116,139,0.35);
  border-top-color: #93c5fd;
  border-radius: 50%;
  animation: sat-spin 0.7s linear infinite;
  flex-shrink: 0;
}
.sat-spinner.active { display: block; }
@keyframes sat-spin { to { transform: rotate(360deg); } }

/* Terrain pulse while satellite image is loading */
#view3d-sat-pulse {
  display: none;
  position: absolute;
  inset: 0;
  pointer-events: none;
}
#view3d-sat-pulse.active {
  display: block;
  animation: sat-pulse 0.8s ease-in-out infinite;
}
@keyframes sat-pulse {
  0%, 100% { background: transparent; }
  50%       { background: rgba(147,197,253,0.18); }
}
.sat-track {
  display: inline-flex;
  align-items: center;
  width: 26px;
  height: 15px;
  border-radius: 8px;
  background: #2d3149;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}
.sat-thumb {
  position: absolute;
  left: 2px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #475569;
  transition: transform 0.2s, background 0.2s;
}
#satellite-btn.active .sat-track { background: #3b82f6; }
#satellite-btn.active .sat-thumb { transform: translateX(11px); background: #fff; }

/* ── 3D view ─────────────────────────────────────────────────────────────── */
#view3d-container {
  display: none;
  position: absolute;
  inset: 0;
  background: #060d18;
}
#view3d-canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}
#view3d-canvas:active { cursor: grabbing; }
#view3d-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #334155;
  font-size: 13px;
  pointer-events: none;
}
#view3d-fabs {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 10;
}
.v3d-fab {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(10,12,18,0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #64748b;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  padding: 0;
}
.v3d-fab:hover { background: rgba(30,33,51,0.9); color: #e2e8f0; }
.v3d-fab.active {
  background: rgba(59,91,219,0.22);
  border-color: rgba(59,91,219,0.55);
  color: #93c5fd;
}
.v3d-fab svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}