@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ─── Reset & Base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep:        #181818;    /* AutoCAD classic dark gray canvas background */
  --bg-panel:       #252526;   /* Classic sidebar panel dark gray (VS Code/AutoCAD) */
  --bg-card:        #2d2d30;    /* Card and control backing */
  --bg-hover:       #3e3e42;   /* Hover background */
  --border:         #3f3f46;     /* Dark gray border rules */
  --border-focus:   #007acc;     /* Microsoft VS Classic Blue */
  --text:           #f1f1f1;       /* Neutral readable white */
  --text-dim:       #cccccc;   /* Dimmed text color */
  --text-muted:     #808080; /* Disabled/Label gray */
  --accent:         #007acc;      /* Standard CAD/Windows Classic Blue */
  --accent-dim:     #1a5276;    /* Darker classic blue */
  --accent-amber:   #e67e22;  /* Warning Orange */
  --green:          #4ec9b0;      /* Engineering Emerald Teal */
  --red:            #f44336;        /* Pure red danger */
  --orange:         #e58537;
  --measure-result: #dcdcaa;
  --font-mono:      "Consolas", "JetBrains Mono", monospace;
  --font-ui:        "Segoe UI", "Inter", system-ui, sans-serif;
  --radius:         0px;          /* CLASSIC SHARP BORDERS (0px) FOR HIGH-DENSITY PROFESSIONAL LOOK */
  --panel-w:        230px;
  --topbar-h:       44px;
}

html, body { height: 100%; overflow: hidden; background: var(--bg-deep); color: var(--text); font-family: var(--font-ui); font-size: 13px; }

button { font-family: var(--font-ui); cursor: pointer; border: none; background: none; color: var(--text); }
button:disabled { opacity: 0.4; cursor: not-allowed; }
input { font-family: var(--font-ui); }

/* ─── App Shell ─────────────────────────────────────────────────────────── */
#app { display: flex; flex-direction: column; height: 100vh; }

/* ─── Topbar ────────────────────────────────────────────────────────────── */
#topbar {
  height: var(--topbar-h);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px;
  flex-shrink: 0;
  z-index: 10;
}

#logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
#logo svg {
  stroke: var(--accent);
}

.system-status {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 210, 255, 0.03);
  border: 1px solid rgba(0, 210, 255, 0.12);
  border-radius: var(--radius);
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}
.status-dot.pulsing {
  animation: pulse-dot 2.5s infinite;
  box-shadow: 0 0 6px var(--green);
}
@keyframes pulse-dot {
  0% { transform: scale(0.95); opacity: 0.5; }
  50% { transform: scale(1.15); opacity: 1; box-shadow: 0 0 8px var(--green); }
  100% { transform: scale(0.95); opacity: 0.5; }
}
.status-text {
  color: var(--accent);
}

#file-controls { display: flex; gap: 6px; }

#upload-btn, #export-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 11px;
  font-weight: 600;
  transition: all 0.15s ease;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

#upload-btn {
  background: var(--accent-dim);
  color: white;
  cursor: pointer;
  border: 1px solid rgba(0, 210, 255, 0.2);
}
#upload-btn:hover { background: #0e7490; border-color: var(--accent); }
#upload-btn input { display: none; }

#export-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
}
#export-btn:hover:not(:disabled) { background: var(--bg-hover); border-color: var(--accent); color: var(--accent); }

#tool-status {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 11px;
}

#coords-display {
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 10px;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  min-width: 160px;
  text-align: center;
}

#status-msg { color: var(--text-dim); font-size: 11px; font-weight: 500; }

#plan-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--border);
}
#plan-name { font-weight: 600; color: var(--text); font-size: 12px; font-family: var(--font-mono); }
#plan-stats { color: var(--text-dim); font-size: 10px; font-family: var(--font-mono); }

/* ─── Main Layout ───────────────────────────────────────────────────────── */
#main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ─── Tool Panel (Left) ─────────────────────────────────────────────────── */
#tool-panel {
  width: var(--panel-w);
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
  padding: 12px 0;
}

.panel-section {
  padding: 4px 8px 12px;
  border-bottom: 1px solid var(--border);
}
.panel-section:last-child { border-bottom: none; }

.panel-title {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 8px 4px 6px;
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--radius);
  font-size: 11.5px;
  color: var(--text-dim);
  transition: all 0.15s ease;
  text-align: left;
  border-left: 2px solid transparent;
}
.tool-btn svg { width: 14px; height: 14px; flex-shrink: 0; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tool-btn:hover:not(:disabled) { background: var(--bg-hover); color: var(--text); }
.tool-btn.active { 
  background: rgba(0, 210, 255, 0.05); 
  color: var(--accent); 
  border-left: 2px solid var(--accent);
  font-weight: 600;
}
.tool-btn.accent { color: var(--green); }
.tool-btn.accent:hover:not(:disabled) { background: rgba(16,185,129,0.1); }
.tool-btn.accent:disabled { color: var(--text-muted); }

/* ─── Canvas Container ──────────────────────────────────────────────────── */
#canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #181818;
}
#canvas-container::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
  z-index: 0;
}

#gl-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  position: relative;
  z-index: 1;
}
#gl-canvas.cursor-pan { cursor: grab; }
#gl-canvas.cursor-grabbing { cursor: grabbing; }
#gl-canvas.cursor-crosshair { cursor: crosshair; }
#gl-canvas.cursor-pointer { cursor: pointer; }

/* Drop Zone */
#drop-zone {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-deep);
  z-index: 5;
  transition: background 0.2s;
}
#drop-zone.drag-over { background: rgba(79,195,247,0.05); }
#drop-zone.drag-over #drop-content { border-color: var(--accent); }
#drop-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 48px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  text-align: center;
  color: var(--text-dim);
  transition: border-color 0.2s;
}
#drop-content p { font-size: 15px; font-weight: 500; color: var(--text); }
#drop-content small { font-size: 12px; }
#drop-zone.hidden { display: none; }

/* Loading Overlay */
#loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(13,17,23,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  backdrop-filter: blur(4px);
}
#loading-content { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 16px; }
#spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loading-text { color: var(--text-dim); font-size: 13px; }
#loading-bar { width: 200px; height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; }
#loading-progress { height: 100%; background: var(--accent); width: 0%; transition: width 0.3s; }

/* Measurement tooltip */
#measure-tooltip {
  position: absolute;
  background: var(--bg-panel);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  pointer-events: none;
  z-index: 15;
  white-space: nowrap;
}

/* Measure info */
#measure-info {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-panel);
  border: 1px solid var(--measure-result);
  border-radius: var(--radius);
  padding: 10px 16px;
  z-index: 15;
  min-width: 220px;
  text-align: center;
}
#measure-info strong { color: var(--measure-result); display: block; margin-bottom: 4px; font-size: 12px; }
#measure-details { color: var(--text-dim); font-size: 11px; font-family: var(--font-mono); }


/* ─── Layers Panel (Right) ──────────────────────────────────────────────── */
#layers-panel {
  width: 220px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  padding: 8px 0;
}

#layer-search-wrap { padding: 4px 8px 8px; }
#layer-search {
  width: 100%;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 8px;
  color: var(--text);
  font-size: 12px;
  outline: none;
}
#layer-search:focus { border-color: var(--accent); }

#layers-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px;
}

.layer-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 4px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.1s;
}
.layer-row:hover { background: var(--bg-hover); }
.layer-row.hidden-layer { opacity: 0.4; }

.layer-eye {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  cursor: pointer;
  stroke: var(--text-dim);
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.layer-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.2);
}
.layer-name {
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}
.layer-count {
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Properties */
#properties-panel {
  padding: 8px;
  overflow-y: auto;
  max-height: 200px;
}
.prop-row { display: flex; justify-content: space-between; padding: 3px 0; border-bottom: 1px solid var(--border); }
.prop-key { color: var(--text-dim); font-size: 11px; }
.prop-val { font-family: var(--font-mono); font-size: 11px; color: var(--accent); }
.empty-hint { color: var(--text-muted); font-size: 11px; text-align: center; padding: 12px 0; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Annotation input popup */
#ann-input-overlay {
  position: absolute;
  background: var(--bg-panel);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 8px;
  z-index: 30;
  display: none;
  gap: 6px;
  flex-direction: column;
  min-width: 200px;
}
#ann-input-overlay input {
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 8px;
  color: var(--text);
  font-size: 12px;
  outline: none;
  width: 100%;
}
#ann-input-overlay input:focus { border-color: var(--accent); }
#ann-input-overlay .ann-btns { display: flex; gap: 6px; }
#ann-input-overlay button {
  flex: 1;
  padding: 4px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
}
#ann-ok { background: var(--accent-dim); color: white; }
#ann-cancel { background: var(--bg-hover); color: var(--text-dim); }

/* ─── Route Config Panel ──────────────────────────────────────────────── */
#route-config-panel {
  padding: 8px;
  overflow-y: auto;
}

.route-config-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}

.route-config-row label {
  font-size: 11px;
  color: var(--text-dim);
  font-weight: 500;
}

.route-config-row input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

.route-config-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--bg-panel);
}

.route-config-row input[type="number"] {
  width: 100%;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 8px;
  color: var(--text);
  font-size: 12px;
  outline: none;
}

.route-config-row input[type="number"]:focus {
  border-color: var(--accent);
}

#route-clearance-value {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  text-align: right;
}

.route-info {
  margin-top: 8px;
  padding: 8px;
  background: var(--bg-deep);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

#route-distance, #route-points {
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  padding: 2px 0;
}

#route-distance {
  color: var(--green);
  font-weight: 500;
}

.waypoint-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: var(--bg-deep);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 4px;
  font-size: 11px;
}

.waypoint-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 10px;
  flex-shrink: 0;
}

.waypoint-coords {
  flex: 1;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.waypoint-remove {
  background: none;
  border: none;
  color: var(--red);
  cursor: pointer;
  font-size: 14px;
  padding: 0 4px;
  opacity: 0.6;
}

.waypoint-remove:hover {
  opacity: 1;
}

.waypoint-actions {
  display: flex;
  gap: 4px;
  align-items: center;
}

.waypoint-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 10px;
  padding: 2px;
  opacity: 0.6;
}

.waypoint-btn:hover {
  opacity: 1;
}

.waypoint-btn-placeholder {
  width: 14px;
  display: inline-block;
}

/* Zone items */
.zone-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: var(--bg-deep);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 4px;
  font-size: 11px;
}

.zone-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 10px;
  flex-shrink: 0;
}

.zone-coords {
  flex: 1;
  font-family: var(--font-mono);
  color: var(--text-dim);
  font-size: 10px;
}

.zone-remove {
  background: none;
  border: none;
  color: var(--red);
  cursor: pointer;
  font-size: 14px;
  padding: 0 4px;
  opacity: 0.6;
}

.zone-remove:hover {
  opacity: 1;
}

/* Route Models Selector / Comparison */
.route-models-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.route-model-card {
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  position: relative;
}

.route-model-card:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
}

.route-model-card.active-route {
  border-color: var(--accent);
  background: rgba(79, 195, 247, 0.05);
  box-shadow: 0 0 8px rgba(79, 195, 247, 0.12);
}

.route-model-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.route-model-name {
  font-weight: 600;
  font-size: 11px;
}

.route-model-name.shortest { color: #f87171; }
.route-model-name.centered { color: #60a5fa; }
.route-model-name.safe { color: #34d399; }
.route-model-name.orthogonal { color: #fbbf24; }

.route-model-badge {
  font-size: 8px;
  padding: 1px 4px;
  border-radius: 3px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.route-model-badge.recommended {
  background: rgba(52, 211, 153, 0.15);
  color: #34d399;
  border: 1px solid rgba(52, 211, 153, 0.3);
}

.route-model-badge.secondary {
  background: var(--bg-panel);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.route-model-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px 10px;
  font-size: 10px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-top: 6px;
  border-top: 1px dashed var(--border);
  padding-top: 6px;
}

.route-model-metric-item {
  display: flex;
  justify-content: space-between;
}

.route-model-metric-label {
  color: var(--text-muted);
}

.route-model-metric-value {
  font-weight: 500;
}

.route-model-metric-value.safety-high { color: #34d399; }
.route-model-metric-value.safety-medium { color: #fbbf24; }
.route-model-metric-value.safety-low { color: #f87171; }

/* ─── Export Dropdown ────────────────────────────────────────────────────── */
.export-dropdown {
  position: relative;
  display: inline-block;
}

.export-dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--bg-panel);
  min-width: 170px;
  border: 1px solid var(--border);
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.5);
  z-index: 100;
  margin-top: 4px;
}

.export-dropdown-content button {
  color: var(--text);
  padding: 8px 12px;
  text-decoration: none;
  display: flex;
  align-items: center;
  width: 100%;
  text-align: left;
  font-size: 11px;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s ease;
  cursor: pointer;
  text-transform: none;
}
.export-dropdown-content button:last-child {
  border-bottom: none;
}

.export-dropdown-content button:hover {
  background-color: var(--bg-hover);
  color: var(--accent);
}

.export-dropdown-content button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.export-dropdown-content.show {
  display: block;
}

.dropdown-arrow {
  font-size: 8px;
  margin-left: 4px;
  vertical-align: middle;
  opacity: 0.7;
}

.route-model-description {
  font-size: 10px;
  color: var(--text-dim);
  margin: 6px 0 8px 0;
  line-height: 1.45;
  text-align: left;
}