:root{
  --bg:#15171a; --panel:#1d2024; --panel2:#23272c; --line:#2f343a;
  --tx:#e6e8ea; --dim:#9aa2ab; --accent:#5aa9e6; --accent2:#f0a04b;
  --ok:#6cc17a;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  background:var(--bg); color:var(--tx); overflow:hidden;
  font:13px/1.45 "Segoe UI",system-ui,-apple-system,sans-serif;
  display:flex; flex-direction:column;
}
button{font:inherit;color:var(--tx);background:var(--panel2);border:1px solid var(--line);
  border-radius:6px;padding:5px 10px;cursor:pointer}
button:hover{background:#2c3238;border-color:#454c54}
button.on{background:var(--accent);border-color:var(--accent);color:#08121a;font-weight:600}
input,select{font:inherit;color:var(--tx);background:#14171a;border:1px solid var(--line);
  border-radius:5px;padding:4px 6px;width:100%}
input[type=checkbox]{width:auto;vertical-align:-2px}
input[type=range]{padding:0}
input[type=color]{padding:1px;height:28px;cursor:pointer}
h2{font-size:13px;margin:0 0 10px;letter-spacing:.04em;text-transform:uppercase;color:var(--dim)}
h3{font-size:12px;margin:14px 0 6px;color:var(--accent)}
.hint{color:var(--dim);font-size:12px;margin:0 0 10px}

/* top bar */
#topbar{display:flex;align-items:center;gap:8px;padding:7px 10px;background:var(--panel);
  border-bottom:1px solid var(--line);flex:0 0 auto}
.brand{font-weight:700;letter-spacing:.02em}
.brand span{font-weight:400;color:var(--dim);font-size:11px;margin-left:6px}
.spacer{flex:1}
.grp{display:flex;gap:4px}
.seg{display:flex;border:1px solid var(--line);border-radius:6px;overflow:hidden;margin-left:14px}
.seg button{border:0;border-radius:0;border-right:1px solid var(--line);padding:5px 12px}
.seg button:last-child{border-right:0}

/* layout */
#app{flex:1;display:flex;min-height:0}
#left,#right{background:var(--panel);border-right:1px solid var(--line);width:250px;flex:0 0 250px;
  display:flex;flex-direction:column;min-height:0;overflow:hidden}
#right{border-right:0;border-left:1px solid var(--line);padding:12px;overflow-y:auto;display:block}
#center{flex:1;display:flex;min-width:0}
.viewport{position:relative;flex:1;min-width:0;background:#0f1113}
#planWrap{border-right:1px solid var(--line)}
canvas{display:block;width:100%;height:100%;touch-action:none}
.vpTag{position:absolute;left:8px;top:6px;font-size:11px;color:var(--dim);pointer-events:none;
  text-shadow:0 1px 2px #000}
body[data-view="plan"] #viewWrap{display:none}
body[data-view="3d"] #planWrap{display:none}

.planHud,.view3dHud{position:absolute;left:8px;bottom:8px;display:flex;gap:12px;align-items:center;
  background:rgba(20,23,26,.82);border:1px solid var(--line);border-radius:6px;padding:5px 9px;font-size:11px}
.view3dHud label,.planHud label{display:flex;gap:4px;align-items:center;white-space:nowrap}
.planHud select{width:auto;padding:1px 4px;font-size:11px}
.view3dHud .sun input{width:80px}
#planCoord{color:var(--accent2);font-variant-numeric:tabular-nums}
#walkHud{position:absolute;left:50%;transform:translateX(-50%);top:10px;background:rgba(20,23,26,.9);
  border:1px solid var(--line);border-radius:6px;padding:6px 12px;font-size:11px;color:var(--dim)}

/* left panel */
.tools{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:8px;border-bottom:1px solid var(--line)}
.tool{display:flex;align-items:center;gap:6px;font-size:12px;padding:6px 8px}
.tool b{font-size:13px;font-weight:400;width:16px;text-align:center}
.tabs{display:flex;border-bottom:1px solid var(--line)}
.tabs button{flex:1;border:0;border-radius:0;background:transparent;color:var(--dim);padding:8px 0;
  border-bottom:2px solid transparent}
.tabs button.on{color:var(--tx);border-bottom-color:var(--accent);background:transparent;font-weight:600}
.panel{display:none;padding:10px;overflow-y:auto;flex:1;min-height:0}
.panel.on{display:block}
.search{margin-bottom:8px}
.catGroup{margin-bottom:10px}
.catGroup h4{margin:0 0 5px;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--dim)}
.catItems{display:grid;grid-template-columns:1fr 1fr;gap:4px}
.catItem{padding:6px;font-size:11px;text-align:left;line-height:1.2}
.catItem.on{outline:2px solid var(--accent)}
.wide{width:100%;margin-bottom:8px}

#swatches{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin:10px 0}
.sw{height:30px;border-radius:5px;border:1px solid #0006;cursor:pointer;position:relative}
.sw.on{outline:2px solid var(--accent);outline-offset:1px}
.swatchRow{display:flex;gap:8px;align-items:center}
.swatchRow input{width:46px;flex:0 0 46px}
#paintName{font-size:12px;color:var(--dim)}
.paintTargets{font-size:12px;color:var(--dim);margin-top:6px}

.roomRow{display:flex;align-items:center;gap:6px;padding:5px 6px;border:1px solid var(--line);
  border-radius:6px;margin-bottom:4px;cursor:pointer;background:var(--panel2)}
.roomRow.on{border-color:var(--accent)}
.roomRow .nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.roomRow .sz{font-size:11px;color:var(--dim)}

/* right panel rows */
.row{display:flex;align-items:center;gap:8px;margin-bottom:7px}
.row label{flex:0 0 92px;color:var(--dim);font-size:12px}
.row .val{flex:1;display:flex;gap:6px;align-items:center}
.row .val input[type=color]{flex:0 0 40px}
.floorPrev{width:72px;height:72px;border-radius:6px;border:1px solid var(--line);cursor:pointer;
  flex:0 0 72px;image-rendering:auto}
.floorPrev:hover{border-color:var(--accent)}
.btnRow{display:flex;gap:6px;margin-top:12px;flex-wrap:wrap}
.danger{border-color:#7a3b3b;color:#f0a2a2}
.danger:hover{background:#4a2626}
.readout{font-variant-numeric:tabular-nums;color:var(--accent2);font-size:12px;text-align:right}
input.readout{flex:0 0 62px;width:62px;padding:3px 5px}
input.readout:focus{color:var(--tx);border-color:var(--accent);outline:none}
span.readout{min-width:52px}

/* status + modal */
#status{flex:0 0 auto;display:flex;justify-content:space-between;gap:10px;padding:4px 12px;
  background:var(--panel);border-top:1px solid var(--line);font-size:11px;color:var(--dim)}
.modal{position:fixed;inset:0;background:#000a;display:flex;align-items:center;justify-content:center;z-index:50}
.modal[hidden]{display:none}
#walkHud[hidden]{display:none}
.modal .sheet{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:20px 24px;
  max-width:820px;max-height:86vh;overflow:auto}
.modal .cols{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.modal ul{margin:0;padding-left:18px;color:var(--dim)}
.modal li{margin-bottom:5px}
.modal b{color:var(--tx)}
.fine{color:var(--dim);font-size:11px;margin:16px 0 12px}
code{background:#0d0f11;padding:1px 4px;border-radius:3px}