:root {
  --paper: #f3f5f4;
  --paper-2: #e7ecea;
  --ink: #1c2a33;
  --ink-2: #4d5d66;
  --rule: #cfd8d6;
  --model: #172430;      /* drawing canvas: CAD model space */
  --model-2: #22364a;
  --flag: #e8336d;       /* survey flagging tape: control points + primary action */
  --flag-ink: #b3144b;
  --good: #1f8a5b;
  --warn: #b97a06;
  --bad: #c8312b;
  --sidebar: 392px;
  --font: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-cond: 'IBM Plex Sans Condensed', 'IBM Plex Sans', system-ui, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; margin: 0; }
body {
  font: 14px/1.45 var(--font);
  color: var(--ink);
  background: var(--paper);
  font-variant-numeric: tabular-nums;
  display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--flag); outline-offset: 2px; }

/* ---------- top bar ---------- */
.topbar {
  height: 52px; flex: none;
  display: flex; align-items: center; gap: 20px;
  padding: 0 16px;
  background: var(--model); color: #e9eff2;
}
.brand { display: flex; align-items: center; gap: 9px; font: 600 17px/1 var(--font-cond); letter-spacing: .01em; }
.brand svg { width: 22px; height: 22px; color: var(--flag); }
.doc-name { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: #a9bac4; }
.top-actions { display: flex; align-items: center; gap: 8px; }
.who { color: #a9bac4; font-size: 13px; margin-left: 8px; }
.topbar .btn.ghost { color: #e9eff2; border-color: #3a5165; }
.topbar .btn.ghost:hover:not(:disabled) { background: var(--model-2); }

/* ---------- buttons & fields ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 34px; padding: 0 14px;
  border: 1px solid var(--rule); border-radius: 6px;
  background: #fff; cursor: pointer; font-weight: 500; white-space: nowrap;
}
.btn:hover:not(:disabled) { background: var(--paper-2); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.small { height: 28px; padding: 0 10px; font-size: 13px; }
.btn.ghost { background: transparent; }
.btn.primary { background: var(--flag); border-color: var(--flag); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--flag-ink); }
.btn.dark { color: #dfe8ec; border-color: #3a5165; }
.btn.dark:hover:not(:disabled) { background: var(--model-2); }
.link { background: none; border: 0; padding: 0; color: var(--flag-ink); cursor: pointer; text-decoration: underline; text-underline-offset: 2px; font-size: 13px; }

.field { display: flex; flex-direction: column; gap: 4px; margin: 10px 0; }
.field > span:first-child { font-size: 13px; color: var(--ink-2); }
.field.row { flex-direction: row; align-items: center; justify-content: space-between; }
.inline { display: flex; gap: 6px; align-items: center; }
input[type=text], input[type=number], select, textarea {
  border: 1px solid var(--rule); border-radius: 6px; background: #fff;
  padding: 6px 8px; min-width: 0;
}
select { padding-right: 4px; }
textarea { resize: vertical; font-size: 12.5px; }
input[type=number] { width: 84px; }

/* ---------- layout ---------- */
.layout { flex: 1; min-height: 0; display: flex; }
.sidebar {
  width: var(--sidebar); flex: none; overflow-y: auto;
  border-right: 1px solid var(--rule); background: var(--paper);
}
.step { padding: 18px 18px 20px; border-bottom: 1px solid var(--rule); }
.step h2 { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; font: 600 16px/1.2 var(--font); }
.num {
  width: 24px; height: 24px; border-radius: 50%;
  display: inline-grid; place-items: center;
  background: var(--model); color: #fff; font: 600 13px/1 var(--font-cond);
}
.note { margin: 8px 0; font-size: 13px; color: var(--ink-2); }
.note.muted { color: #6f7f86; }
.note.warn { color: var(--warn); }

.restore {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  padding: 12px 18px; background: #fff3d6; border-bottom: 1px solid #ecd9a6; font-size: 13px;
}
.restore span { flex: 1 1 100%; }

.drop {
  display: block; padding: 16px; border: 1.5px dashed #9fb0b4; border-radius: 8px;
  background: #fff; cursor: pointer; text-align: left;
}
.drop strong { display: block; margin-bottom: 4px; }
.drop span { font-size: 13px; color: var(--ink-2); }
.drop.over { border-color: var(--flag); background: #fff4f7; }
.drop.compact { padding: 10px 14px; }
.drop.compact span { display: none; }

.facts { display: grid; grid-template-columns: 1fr; gap: 4px; margin: 12px 0 4px; }
.facts div { display: flex; gap: 10px; font-size: 13px; }
.facts dt { width: 64px; flex: none; color: var(--ink-2); }
.facts dd { margin: 0; }

.layers-head { display: flex; justify-content: space-between; align-items: baseline; margin-top: 14px; font-size: 13px; color: var(--ink-2); }
.layers { list-style: none; margin: 6px 0 0; padding: 0; max-height: 220px; overflow-y: auto; border: 1px solid var(--rule); border-radius: 6px; background: #fff; }
.layers li { display: flex; align-items: center; gap: 8px; padding: 5px 10px; font-size: 13px; border-bottom: 1px solid #eef1f0; }
.layers li:last-child { border-bottom: 0; }
.layers label { flex: 1; display: flex; align-items: center; gap: 8px; cursor: pointer; min-width: 0; }
.layers .nm { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.layers .ct { color: #7d8b91; font-size: 12px; }
.swatch { width: 12px; height: 12px; border-radius: 2px; border: 1px solid rgba(0,0,0,.25); flex: none; }

/* segmented control */
.seg { display: flex; padding: 3px; background: var(--paper-2); border-radius: 8px; margin-bottom: 4px; }
.seg button { flex: 1; height: 30px; border: 0; border-radius: 6px; background: transparent; cursor: pointer; font-weight: 500; color: var(--ink-2); }
.seg button[aria-selected=true] { background: #fff; color: var(--ink); box-shadow: 0 1px 2px rgba(23,36,48,.18); }

/* control points */
.cp-head { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; font-weight: 600; }
.cp-tools { display: flex; gap: 6px; }
.cps { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.cp {
  background: #fff; border: 1px solid var(--rule); border-radius: 8px; padding: 10px;
  display: grid; grid-template-columns: 26px 1fr; gap: 6px 8px;
}
.cp.active { border-color: var(--flag); box-shadow: 0 0 0 1px var(--flag); }
.cp .tag {
  grid-row: span 3; width: 24px; height: 24px; border-radius: 50%;
  background: var(--flag); color: #fff; display: grid; place-items: center; font: 600 12px/1 var(--font-cond);
}
.cp .tag.off { background: #a8b4b8; }
.cp .top { display: flex; gap: 6px; align-items: center; }
.cp .top input[type=text] { flex: 1; font-weight: 500; }
.cp .x { border: 0; background: none; cursor: pointer; color: #7d8b91; font-size: 18px; line-height: 1; padding: 2px 4px; }
.cp .x:hover { color: var(--bad); }
.cp .pair { display: grid; grid-template-columns: 1fr 1fr auto; gap: 4px; align-items: center; }
.cp .pair input { width: 100%; font-size: 12.5px; padding: 5px 6px; }
.cp .pair .btn { height: 28px; padding: 0 8px; font-size: 12px; }
.cp .lbl { grid-column: 1 / -1; font-size: 12px; color: var(--ink-2); margin-bottom: -2px; }
.cp .foot { grid-column: 2; display: flex; justify-content: space-between; align-items: center; font-size: 12.5px; }
.cp .foot label { display: flex; gap: 5px; align-items: center; color: var(--ink-2); }
.cp select.from { font-size: 12px; padding: 3px 4px; max-width: 150px; }
.res { font-weight: 600; }
.res.good { color: var(--good); } .res.warn { color: var(--warn); } .res.bad { color: var(--bad); }

.imported { margin-top: 8px; }

/* verdict */
.verdict { border-radius: 8px; padding: 12px 14px; background: #fff; border: 1px solid var(--rule); font-size: 13px; }
.verdict p { margin: 0; }
.verdict .big { font: 600 15px/1.3 var(--font); margin-bottom: 4px; }
.verdict.good { border-color: var(--good); background: #eef8f2; }
.verdict.warn { border-color: #e1c27a; background: #fff8e8; }
.verdict.bad { border-color: #e2a19d; background: #fdf0ef; }
.verdict ul { margin: 6px 0 0; padding-left: 18px; }

.opts { border: 0; padding: 0; margin: 14px 0 0; display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.opts legend { color: var(--ink-2); margin-bottom: 6px; padding: 0; }
.opts label { display: flex; gap: 8px; align-items: center; }
.opts input[type=color] { width: 28px; height: 22px; padding: 0; border: 1px solid var(--rule); border-radius: 4px; background: none; }
.export-actions { display: flex; gap: 8px; margin-top: 14px; }
.export-actions .btn { flex: 1; height: 40px; }

/* ---------- views ---------- */
.views { flex: 1; min-width: 0; position: relative; display: grid; grid-template-columns: 1fr 1fr; }
.views[data-view=map] { grid-template-columns: 0 1fr; }
.views[data-view=drawing] { grid-template-columns: 1fr 0; }
.views[data-view=map] .pane-dwg, .views[data-view=drawing] .pane-map { visibility: hidden; }
.pane { position: relative; min-width: 0; overflow: hidden; }
.pane-dwg { background: var(--model); border-right: 2px solid #0d1720; }
#cvs { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: grab; touch-action: none; }
#cvs.dragging { cursor: grabbing; }
#cvs.picking { cursor: crosshair; }
#map { position: absolute; inset: 0; background: #2a3a44; }
#map.picking { cursor: crosshair; }
.leaflet-container.picking { cursor: crosshair; }

.view-switch {
  position: absolute; z-index: 800; top: 12px; left: 50%; transform: translateX(-50%);
  display: flex; padding: 3px; border-radius: 8px; background: rgba(23,36,48,.92);
}
.view-switch button { border: 0; background: none; color: #b8c7cf; height: 28px; padding: 0 12px; border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500; }
.view-switch .narrow { display: none; }
.view-switch button[aria-pressed=true] { background: #fff; color: var(--ink); }

.pane-tools { position: absolute; top: 12px; left: 12px; z-index: 5; }
.map-tools {
  position: absolute; z-index: 700; top: 56px; right: 12px;
  display: flex; flex-direction: column; gap: 8px; align-items: stretch;
  background: rgba(255,255,255,.95); padding: 10px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,.25);
  font-size: 13px;
}
.views[data-view=map] .map-tools { top: 12px; }
.opacity { display: flex; align-items: center; gap: 8px; }
.opacity input { width: 110px; accent-color: var(--flag); }

.readout {
  position: absolute; left: 12px; bottom: 10px; z-index: 600;
  font-size: 12px; padding: 3px 8px; border-radius: 4px; pointer-events: none;
}
.pane-dwg .readout { color: #b8c7cf; background: rgba(13,23,32,.7); }
.pane-map .readout { color: #fff; background: rgba(13,23,32,.7); }
.readout:empty { display: none; }
.empty { position: absolute; inset: 0; display: grid; place-items: center; color: #8ea2ad; font-size: 15px; pointer-events: none; }

.pickbar {
  position: absolute; z-index: 900; bottom: 18px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 12px; align-items: center;
  background: var(--model); color: #fff; padding: 8px 10px 8px 16px; border-radius: 8px;
  border-left: 4px solid var(--flag); box-shadow: 0 4px 16px rgba(0,0,0,.35); font-size: 13.5px;
}

/* map markers */
.cp-marker {
  width: 26px; height: 26px; border-radius: 50%;
  border: 2px solid #fff; background: var(--flag); color: #fff;
  display: grid; place-items: center; font: 600 12px/1 var(--font-cond);
  box-shadow: 0 0 0 2px var(--flag), 0 2px 6px rgba(0,0,0,.5);
}
.cp-marker.active { box-shadow: 0 0 0 3px #fff, 0 0 0 6px var(--flag); }
.cp-pred { width: 12px; height: 12px; border-radius: 50%; border: 2px solid #fff; background: transparent; box-shadow: 0 0 0 1px rgba(0,0,0,.6); }
.dwg-label {
  white-space: pre; transform-origin: 0 100%; font-family: var(--font); line-height: 1;
  text-shadow: 0 0 2px #000, 0 0 3px #000; pointer-events: none;
}
.leaflet-div-icon.plain { background: none; border: 0; }

.toast {
  position: fixed; z-index: 2000; left: 50%; bottom: 24px; transform: translate(-50%, 20px);
  background: var(--model); color: #fff; padding: 10px 16px; border-radius: 8px;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; max-width: min(560px, 90vw); font-size: 13.5px;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: var(--bad); }

/* ---------- small screens: stack ---------- */
@media (max-width: 900px) {
  .layout { flex-direction: column; overflow-y: auto; }
  .sidebar { width: 100%; border-right: 0; overflow: visible; order: 2; }
  .views { order: 1; min-height: 70vh; grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .views[data-view=map] { grid-template-columns: 1fr; grid-template-rows: 0 1fr; }
  .views[data-view=drawing] { grid-template-columns: 1fr; grid-template-rows: 1fr 0; }
  .doc-name { display: none; }
  .view-switch { left: auto; right: 12px; transform: none; }
  .view-switch .wide { display: none; } .view-switch .narrow { display: inline; }
  .map-tools, .views[data-view=map] .map-tools { top: 12px; padding: 8px; gap: 6px; }
  .opacity { display: none; }
  .top-actions .btn { padding: 0 10px; }
}
@media (prefers-reduced-motion: reduce) { .toast { transition: none; } }