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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #1a1a2e;
  color: #e0e0e0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---- Toolbar ---- */
#toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
  padding: 8px 16px;
  background: #16213e;
  border-bottom: 1px solid #0f3460;
  flex-shrink: 0;
  z-index: 10;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-group label {
  font-size: 12px;
  color: #a0a0a0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#trail-selector {
  background: #0f3460;
  color: #e0e0e0;
  border: 1px solid #1a4080;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
  min-width: 180px;
}

button {
  background: #0f3460;
  color: #e0e0e0;
  border: 1px solid #1a4080;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover { background: #1a4080; }
button.active { background: #e94560; border-color: #e94560; }

#status-bar {
  margin-left: auto;
  font-size: 12px;
  color: #888;
}

/* ---- Main layout (vertical: map on top, bottom panel below) ---- */
#main {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

#map-container {
  flex: 1;
  position: relative;
  min-height: 0;
}

#map {
  width: 100%;
  height: 100%;
}

/* ---- Resize handle ---- */
#resize-handle {
  height: 5px;
  background: #0f3460;
  cursor: ns-resize;
  flex-shrink: 0;
  position: relative;
}
#resize-handle:hover,
#resize-handle.dragging {
  background: #e94560;
}

/* ---- Bottom panel (horizontal: stats left, charts right) ---- */
#bottom-panel {
  display: flex;
  height: 280px;
  min-height: 100px;
  max-height: 80vh;
  background: #16213e;
  flex-shrink: 0;
}

#charts-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

/* ---- Tab bar ---- */
#tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid #0f3460;
  flex-shrink: 0;
  background: #16213e;
}

.tab-btn {
  padding: 6px 14px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  color: #888;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.tab-btn:hover { color: #ccc; background: transparent; }
.tab-btn.active { color: #e0e0e0; border-bottom-color: #e94560; background: transparent; }
.tab-btn.disabled { opacity: 0.35; cursor: not-allowed; }
.tab-btn.disabled:hover { color: #888; }

/* ---- Tab panes ---- */
.tab-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}
.tab-pane.hidden { display: none !important; }

.chart-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 4px 10px;
}
.chart-panel canvas {
  flex: 1;
  min-height: 0;
}

#help-column {
  width: 180px;
  min-width: 150px;
  flex-shrink: 0;
  overflow-y: auto;
  border-left: 1px solid #0f3460;
}

.help-panel {
  padding: 8px 10px !important;
}

.help-panel h3 {
  font-size: 12px;
  margin-bottom: 6px;
  color: #aaa;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.help-list {
  font-size: 11px;
  line-height: 1.4;
}

.help-list dt {
  color: #8ab4f8;
  font-weight: 600;
  margin-top: 5px;
}

.help-list dd {
  color: #999;
  margin-left: 0;
  margin-bottom: 2px;
}

.panel {
  padding: 8px 10px;
  border-bottom: 1px solid #0f3460;
}

.panel h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #a0a0a0;
  margin-bottom: 6px;
}

/* ---- Stats grid ---- */
#stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  padding: 2px 6px;
  background: #1a1a2e;
  border-radius: 3px;
}

.stat-label {
  font-size: 10px;
  color: #888;
}

.stat-value {
  font-size: 11px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ---- Charts (handled by .chart-panel now) ---- */

/* ---- Stats comparison table ---- */
.stats-comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
  white-space: nowrap;
}

.stats-comparison-table thead {
  position: sticky;
  top: 0;
  background: #16213e;
  z-index: 1;
}

.stats-comparison-table th {
  padding: 6px 10px;
  text-align: right;
  color: #a0a0a0;
  font-weight: 500;
  border-bottom: 1px solid #0f3460;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.stats-comparison-table td {
  padding: 4px 10px;
  text-align: right;
  border-bottom: 1px solid rgba(15, 52, 96, 0.5);
  font-variant-numeric: tabular-nums;
}

.stats-comparison-table tr:hover {
  background: rgba(233, 69, 96, 0.08);
}

.stats-metric-col {
  text-align: left !important;
  color: #888;
  font-weight: 500;
  min-width: 100px;
  position: sticky;
  left: 0;
  background: #16213e;
}

.stats-selected-col {
  color: #e94560 !important;
  font-weight: 600;
  background: rgba(233, 69, 96, 0.05);
}

.grade-cell {
  font-weight: 600;
  text-align: right;
  padding-right: 8px;
}

/* Grade color classes — uphill (warm) */
.grade-up-0 { color: #1a9641; }
.grade-up-1 { color: #a6d96a; }
.grade-up-2 { color: #fee08b; }
.grade-up-3 { color: #fdae61; }
.grade-up-4 { color: #d73027; }
/* Grade color classes — downhill (cool) */
.grade-dn-0 { color: #1a9641; }
.grade-dn-1 { color: #66c2a5; }
.grade-dn-2 { color: #3288bd; }
.grade-dn-3 { color: #5e4fa2; }
.grade-dn-4 { color: #4a3fa0; }

.dir-up { color: #e94560; }
.dir-down { color: #4ecdc4; }

/* ---- Tooltip ---- */
.tooltip {
  position: absolute;
  background: rgba(22, 33, 62, 0.9);
  color: #e0e0e0;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  pointer-events: none;
  z-index: 100;
  white-space: nowrap;
}

.hidden { display: none !important; }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: #16213e;
  border: 1px solid #0f3460;
  border-radius: 8px;
  width: 560px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid #0f3460;
}

.modal-header h3 {
  font-size: 14px;
  color: #e0e0e0;
  margin: 0;
}

.modal-close-btn {
  background: none;
  border: none;
  color: #888;
  font-size: 20px;
  cursor: pointer;
  padding: 0 4px;
}

.modal-close-btn:hover { color: #e94560; }

.modal-body {
  padding: 12px 16px;
  overflow-y: auto;
  flex: 1;
}

.file-group {
  margin-bottom: 16px;
}

.file-group-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #888;
  margin-bottom: 6px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: #1a1a2e;
  border-radius: 4px;
  margin-bottom: 4px;
  cursor: pointer;
  transition: background 0.15s;
}

.file-item:hover {
  background: #0f3460;
}

.file-item-name {
  font-size: 13px;
  color: #e0e0e0;
}

.file-item-meta {
  font-size: 11px;
  color: #888;
}

.file-item-dir {
  font-size: 10px;
  color: #666;
}

.layer-list {
  margin-left: 20px;
  margin-top: 4px;
}

.layer-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: #1a1a2e;
  border-radius: 4px;
  margin-bottom: 3px;
  cursor: pointer;
  border-left: 3px solid #4ecdc4;
  transition: background 0.15s;
}

.layer-item:hover {
  background: #0f3460;
}

.layer-item-name {
  font-size: 12px;
  color: #e0e0e0;
}

.layer-item-type {
  font-size: 10px;
  color: #888;
}

.loading-spinner {
  color: #888;
  font-size: 12px;
  padding: 8px;
  text-align: center;
}

.file-upload-btn {
  display: inline-block;
  padding: 10px 20px;
  background: #0f3460;
  color: #e0e0e0;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  transition: background 0.15s;
  text-align: center;
}
.file-upload-btn:hover {
  background: #1a5276;
}

/* ---- Optimizer Modal ---- */
.optimizer-modal-overlay {
  align-items: flex-start !important;
  justify-content: flex-start !important;
  padding-top: 60px;
  padding-left: 20px;
  pointer-events: none;
  background: none !important;
}
.optimizer-modal-overlay .optimizer-modal {
  pointer-events: auto;
}

.optimizer-modal {
  width: 480px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.opt-summary {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: #aaa;
  margin-bottom: 14px;
}
.opt-summary b { color: #e0e0e0; }

.opt-target-row {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid #0f3460;
}

.opt-param-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.opt-param-row label {
  font-size: 11px;
  color: #aaa;
  min-width: 110px;
  flex-shrink: 0;
}

.opt-param-row input[type="range"] {
  flex: 1;
  height: 4px;
  accent-color: #e94560;
  cursor: pointer;
}

.opt-val {
  font-size: 11px;
  color: #e0e0e0;
  min-width: 48px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Advanced params collapsible */
.opt-advanced {
  margin: 10px 0;
}

.opt-advanced summary {
  font-size: 11px;
  color: #e94560;
  cursor: pointer;
  padding: 6px 0;
  user-select: none;
  letter-spacing: 0.3px;
}

.opt-advanced summary:hover {
  color: #ff6b8a;
}

.opt-advanced[open] summary {
  margin-bottom: 8px;
}

.opt-param-grid {
  padding: 8px;
  background: #1a1a2e;
  border-radius: 4px;
  border: 1px solid #0f3460;
}

.opt-group-header {
  font-size: 10px;
  font-weight: 600;
  color: #e94560;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin: 10px 0 4px 0;
  padding-bottom: 3px;
  border-bottom: 1px solid #0f3460;
}
.opt-group-header:first-child {
  margin-top: 2px;
}

.opt-tip {
  display: inline-block;
  width: 13px;
  height: 13px;
  line-height: 13px;
  text-align: center;
  font-size: 9px;
  font-weight: bold;
  color: #666;
  background: #2a2a4a;
  border-radius: 50%;
  cursor: help;
  vertical-align: middle;
  margin-left: 2px;
}

/* Progress bar */
.opt-progress {
  margin: 12px 0 8px;
}

.opt-progress.hidden { display: none; }

.opt-progress-bar {
  height: 4px;
  background: #1a1a2e;
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 6px;
}

.opt-progress-fill {
  height: 100%;
  background: #e94560;
  width: 0%;
  transition: width 0.2s ease;
  border-radius: 2px;
}

.opt-progress-text {
  font-size: 11px;
  color: #aaa;
  font-variant-numeric: tabular-nums;
}

/* Action buttons */
.opt-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 12px;
}

.opt-btn {
  padding: 6px 16px;
  border-radius: 4px;
  border: 1px solid #1a4080;
  background: #0f3460;
  color: #e0e0e0;
  font-size: 12px;
  cursor: pointer;
}

.opt-btn:hover { background: #1a4080; }

.opt-btn-primary {
  background: #e94560;
  border-color: #e94560;
  color: #fff;
}

.opt-btn-primary:hover {
  background: #ff6b8a;
  border-color: #ff6b8a;
}

.opt-btn-secondary {
  background: #2196F3;
  border-color: #2196F3;
  color: #fff;
}
.opt-btn-secondary:hover {
  background: #42a5f5;
  border-color: #42a5f5;
}

.opt-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.opt-phase2-params {
  margin-top: 8px;
  font-size: 12px;
}
.opt-phase2-params summary {
  cursor: pointer;
  color: #aaa;
  font-size: 11px;
}

/* ---- Freeze controls ---- */
.opt-freeze-section {
  margin: 8px 0 12px;
  padding: 8px 10px;
  background: rgba(33, 150, 243, 0.08);
  border: 1px solid rgba(33, 150, 243, 0.25);
  border-radius: 6px;
}
.opt-freeze-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.opt-freeze-label {
  font-size: 13px;
  color: #ccc;
  flex: 1;
}
.opt-freeze-label b {
  color: #2196F3;
}
.opt-btn-sm {
  padding: 3px 8px;
  font-size: 11px;
  background: #1a3a5c;
  color: #ccc;
  border: 1px solid #2a4a6c;
  border-radius: 4px;
  cursor: pointer;
}
.opt-btn-sm:hover {
  background: #2a4a6c;
  color: #fff;
}
.opt-freeze-hint {
  font-size: 11px;
  color: #888;
  margin-top: 4px;
  font-style: italic;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #1a1a2e; }
::-webkit-scrollbar-thumb { background: #0f3460; border-radius: 3px; }

/* ═══════════════════════════════════════════════
   SPLASH / GUIDE SCREEN
   ═══════════════════════════════════════════════ */
.splash-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}
.splash-overlay.hidden { display: none; }

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.splash-modal {
  background: #16213e;
  border: 1px solid #0f3460;
  border-radius: 10px;
  max-width: 720px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.splash-header {
  text-align: center;
  padding: 28px 28px 12px;
  border-bottom: 1px solid #0f3460;
}
.splash-header h1 {
  color: #e0e0e0;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.splash-subtitle {
  color: #888;
  font-size: 14px;
}

.splash-body {
  padding: 20px 28px;
}

.splash-section {
  margin-bottom: 20px;
}
.splash-section h2 {
  color: #e94560;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 10px;
  padding-bottom: 4px;
  border-bottom: 1px solid #0f3460;
}

/* Steps */
.splash-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.splash-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.splash-step-num {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #e94560;
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}
.splash-step div {
  color: #ccc;
  font-size: 13px;
  line-height: 1.5;
}
.splash-step b { color: #e0e0e0; }
.splash-step em { color: #e94560; font-style: normal; }

/* Layout description */
.splash-layout-desc {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.splash-layout-item {
  color: #ccc;
  font-size: 13px;
  line-height: 1.5;
  padding-left: 12px;
  border-left: 2px solid #0f3460;
}
.splash-layout-item b { color: #e0e0e0; }

/* Tips */
.splash-tips {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.splash-tip {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.splash-tip-icon {
  flex-shrink: 0;
  font-size: 16px;
  width: 24px;
  text-align: center;
  margin-top: 1px;
}
.splash-tip div {
  color: #aaa;
  font-size: 12px;
  line-height: 1.5;
}
.splash-tip b { color: #ccc; }
.splash-tip code {
  background: #0f3460;
  color: #e94560;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 11px;
}
.splash-tip kbd {
  background: #2a2a4a;
  color: #e0e0e0;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 11px;
  border: 1px solid #444;
}

/* Footer */
.splash-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  border-top: 1px solid #0f3460;
}
.splash-checkbox {
  color: #888;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.splash-checkbox input { accent-color: #e94560; }

/* ---- Preprocess Panel ---- */
.preprocess-panel {
  background: #16213e;
  border-bottom: 1px solid #0f3460;
  padding: 12px 20px;
  flex-shrink: 0;
  z-index: 9;
}
.preprocess-panel.hidden { display: none; }

.preprocess-header h3 {
  font-size: 14px;
  color: #e94560;
  margin-bottom: 4px;
}
.preprocess-header p {
  font-size: 12px;
  color: #a0a0a0;
  margin-bottom: 10px;
}

.preprocess-steps {
  display: flex;
  gap: 16px;
  margin-bottom: 10px;
}
.preprocess-step {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: #c0c0c0;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #0f3460;
  color: #e0e0e0;
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
}
.step-status {
  color: #4488ff;
  font-size: 11px;
  margin-left: 4px;
}

.preprocess-progress {
  margin-bottom: 10px;
}
.preprocess-progress.hidden { display: none; }

.preprocess-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* ---- DEM setup panel ---- */
.dem-panel-file {
  color: #c0c0c0;
  font-weight: 400;
  font-size: 12px;
  margin-left: 8px;
}
.dem-grid {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 6px 14px;
  font-size: 12px;
  color: #c0c0c0;
  margin: 6px 0 10px;
  align-items: baseline;
}
.dem-label { color: #888; }
.dem-value { color: #e0e0e0; }
.dem-note { color: #8aa0c0; font-size: 11px; margin-left: 6px; }
.dem-note-error { color: #ff7a7a; }
.dem-note-warn { color: #f0c060; }
.dem-area { display: flex; flex-direction: column; gap: 3px; }
.dem-area input { accent-color: #e94560; margin-right: 4px; }
.dem-area input:disabled + * { opacity: 0.6; }
.dem-gdal-hint {
  margin-top: 6px;
  padding: 6px 8px;
  background: #0f1a33;
  border: 1px solid #0f3460;
  border-radius: 4px;
  color: #e0e0e0;
  font-size: 11px;
  white-space: pre-wrap;
  user-select: all;
}
#dem-units {
  background: #0f3460;
  color: #e0e0e0;
  border: 1px solid #1a4080;
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 12px;
}
.dem-panel-msg { font-size: 12px; color: #a0a0a0; min-height: 0; margin-bottom: 8px; }
.dem-panel-msg:empty { display: none; }

/* ---- Notices over the map ---- */
#notice-area {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: min(720px, calc(100% - 32px));
  z-index: 5;
  display: flex;
  flex-direction: column;
  gap: 6px;
  pointer-events: none;
}
.notice {
  pointer-events: auto;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 10px 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  line-height: 1.45;
  color: #f0f0f0;
  background: #16213e;
  border: 1px solid #0f3460;
  border-left: 4px solid #4488ff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}
.notice-warn { border-left-color: #f0c060; }
.notice-error { border-left-color: #ff5a5a; background: #2a1a24; }
.notice-text { flex: 1; }
.notice-actions { display: flex; gap: 6px; align-items: center; flex-shrink: 0; }
.notice-actions button { padding: 3px 9px; font-size: 11px; }
.notice-close {
  background: none !important;
  border: none !important;
  color: #888;
  font-size: 16px;
  padding: 0 4px !important;
  line-height: 1;
}
.notice-close:hover { color: #e94560; }