/* ───────── CSS Reset & Base Layout ───────── */
*,*:before,*:after{box-sizing:border-box}
html,body{margin:0;height:100%;font:14px/1.4 system-ui,sans-serif}

/* ───────── Layout System ───────── */
#layout{
  display:grid;
  grid-template-columns:280px 1fr;  /* sidebar | map */
  grid-template-rows:1fr;           /* single row    */
  height:100%;
}
#sidebar{grid-column:1;overflow:auto;background:#fafafa;
         border-right:1px solid #ccc}
#map    {grid-column:2;position:relative}

/* Mobile Responsive */
@media(max-width:900px){
  #layout{display:flex;flex-direction:column}
  #sidebar{order:0;width:100%;max-height:40vh;overflow:auto}
  #map{order:1;height:60vh;min-height:250px;width:100%}
}

/* ───────── UI Widgets ───────── */
section{padding:8px 14px}
details{border:1px solid #ddd;border-radius:4px;margin-bottom:8px;background:#fff}
summary{padding:6px 10px;font-weight:600;background:#eee;cursor:pointer}
details[open]>summary{background:#e0e0e0}
label{display:block;margin:.35em 0}
input,select{width:100%;padding:4px}
button.btn{width:100%;margin:.35em 0;padding:6px;border:none;
           background:#f57c00;color:#fff;border-radius:4px;font-size:14px}
button.btn:hover{background:#c15f00}
button.btn:disabled{opacity:.55}
.row{display:flex;align-items:center;gap:.5em}
.row input[type=range]{flex:1}
label.toggle{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:6px;margin:.3em 0}
label.toggle input{margin:0}
.header{font-size:20px;padding:10px 14px;background:#333;color:#fff}

/* ───────── OpenLayers Popup ───────── */
.ol-popup{position:absolute;background:#fff;padding:3px;border-radius:1px;
          border:3px solid #ccc;min-width:140px;z-index:1000;font-size:12px}
.ol-popup *{margin:0;padding:0;line-height:1}
.ol-popup:before,
.ol-popup:after{
  display:none;
}

/* ───────── Measurement Result Popups ───────── */
.measurement-popup{
  position:absolute;background:rgba(255, 255, 255, 0.95);
  backdrop-filter:blur(10px);border:1px solid #e5e7eb;
  border-radius:8px;padding:0;font-size:14px;
  box-shadow:0 4px 20px rgba(0,0,0,0.15);
  z-index:9999;max-width:280px;overflow:hidden;
}

.measurement-popup-header{
  background:linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  color:white;padding:8px 12px;font-weight:600;
  display:flex;align-items:center;gap:6px;
}

.measurement-popup-header i{
  font-size:14px;opacity:0.9;
}

.measurement-popup-content{
  padding:12px;
}

.measurement-value{
  font-size:18px;font-weight:700;color:#1f2937;
  margin-bottom:4px;
}

.measurement-unit{
  color:#6b7280;font-size:13px;margin-bottom:8px;
}

.measurement-actions{
  border-top:1px solid #f1f5f9;padding-top:8px;
  display:flex;align-items:center;justify-content:center;
}

.measurement-clear-btn{
  background:none;border:none;color:#6b7280;
  font-size:12px;cursor:pointer;padding:4px 8px;
  border-radius:4px;transition:all 0.2s ease;
  display:flex;align-items:center;gap:4px;
}

.measurement-clear-btn:hover{
  background:#f8fafc;color:#374151;
}

.measurement-clear-btn i{
  font-size:11px;
}

.measurement-units{
  margin-bottom:8px;
}

.measurement-unit-select{
  width:100%;padding:4px 8px;border:1px solid #e5e7eb;
  border-radius:4px;font-size:12px;background:#fff;
  color:#374151;cursor:pointer;
}

.measurement-unit-select:focus{
  outline:none;border-color:#6366f1;
  box-shadow:0 0 0 2px rgba(99, 102, 241, 0.1);
}

/* ───────── DEM Legend ───────── */
.dem-legend{position:absolute;top:10px;right:10px;background:#fff;border:1px solid #333;
            border-radius:4px;padding:8px;z-index:9999;font-size:13px;max-width:80px;
            box-shadow:2px 2px 5px rgba(0,0,0,.3)}
.dem-legend-title{font-weight:bold;margin-bottom:5px;text-align:center}
.dem-legend-gradient{height:12px;margin-bottom:6px;background:linear-gradient(to right,
  #0000ff 0%, #00ffff 20%, #00ff00 40%, #ffff00 60%, #ffa500 80%, #ff0000 100%);
  border:1px solid #999}

/* ───────── Utility Classes ───────── */
.hidden{display:none !important}
.viewer-hide{display:none !important}
.legacy-base{display:none}