:root{
  --bg:#12141a; --bg2:#191c24; --bg3:#222634; --line:#2f3546;
  --fg:#e7eaf2; --muted:#98a0b5; --accent:#5ac8fa; --accent2:#ffd166;
  --existing:#39d98a; --missing:#ff5c7a; --unsure:#c792ea;
  --pad:10px;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--fg);font:13px/1.45 ui-sans-serif,system-ui,"Segoe UI",Roboto,sans-serif;overflow:hidden}
button{font:inherit;color:var(--fg);background:var(--bg3);border:1px solid var(--line);border-radius:6px;padding:5px 10px;cursor:pointer}
button:hover{border-color:#48506a}
button.tool.active{background:var(--accent);color:#06202b;border-color:var(--accent);font-weight:600}
button.ghost{background:transparent}
button.sm{padding:3px 7px;font-size:12px}
button.primary{background:var(--accent);color:#06202b;border-color:var(--accent);font-weight:600}
button:disabled{opacity:.4;cursor:not-allowed}
input[type=number],input[type=text],select{font:inherit;color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:5px;padding:4px 6px;width:100%}
input[type=range]{width:100%;accent-color:var(--accent)}
label.chk{display:inline-flex;gap:4px;align-items:center;cursor:pointer;color:var(--muted);white-space:nowrap}
label.chk input{accent-color:var(--accent)}

#topbar{display:flex;gap:10px;align-items:center;padding:8px 12px;background:var(--bg2);border-bottom:1px solid var(--line)}
#topbar h1{font-size:14px;margin:0;letter-spacing:.4px;font-weight:700}
#topbar .spacer{flex:1}
#status{color:var(--muted);font-size:12px}
.filebtn{background:var(--accent);color:#06202b;font-weight:600;border-radius:6px;padding:5px 10px;cursor:pointer}

#app{display:grid;grid-template-columns:330px 1fr;height:calc(100% - 41px)}
#sidebar{overflow-y:auto;border-right:1px solid var(--line);background:var(--bg2);padding-bottom:40px}
#panes{display:grid;grid-template-rows:minmax(0,1fr) minmax(0,1.25fr);min-width:0}
@media(min-width:1500px){#panes{grid-template-rows:none;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr)}}
.pane{position:relative;display:flex;flex-direction:column;min-height:0;border-bottom:1px solid var(--line);border-left:1px solid var(--line)}
.paneHead{display:flex;gap:8px;align-items:center;flex-wrap:wrap;padding:5px 8px;background:var(--bg2);border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}
.paneTools{display:flex;gap:5px;align-items:center;flex-wrap:wrap;margin-left:auto}
.paneTools .sep{width:1px;height:16px;background:var(--line);margin:0 3px}
#viewport3d{flex:1;min-height:0;position:relative}
#viewport3d canvas{display:block}
#viewport2d{flex:1;min-height:0;width:100%;display:block;touch-action:none;cursor:crosshair}
#hint2d{position:absolute;left:8px;bottom:8px;background:#000a;padding:3px 8px;border-radius:5px;color:var(--muted);font-size:11px;pointer-events:none}

.sec{border-bottom:1px solid var(--line)}
.sec>h2{margin:0;font-size:12px;letter-spacing:.5px;text-transform:uppercase;color:var(--muted);
  padding:9px 12px;cursor:pointer;display:flex;gap:8px;align-items:center;user-select:none}
.sec>h2 .num{display:inline-flex;width:18px;height:18px;border-radius:50%;background:var(--bg3);
  align-items:center;justify-content:center;font-size:11px;color:var(--fg)}
.sec>h2 .chev{margin-left:auto;transition:transform .15s}
.sec.closed>h2 .chev{transform:rotate(-90deg)}
.sec.closed .secBody{display:none}
.sec.done>h2 .num{background:var(--existing);color:#04231a}
.secBody{padding:2px 12px 12px}
.row{display:flex;gap:8px;align-items:center;margin:7px 0}
.row>label{flex:0 0 120px;color:var(--muted)}
.row.wrap{flex-wrap:wrap}
.row.btns{gap:6px}
.hintline{color:var(--muted);font-size:11.5px;margin:6px 0}
.stat{display:flex;justify-content:space-between;padding:3px 0;border-bottom:1px dashed var(--line)}
.stat b{font-variant-numeric:tabular-nums}
.big{font-size:26px;font-weight:700;line-height:1.1}
.pill{display:inline-block;padding:1px 7px;border-radius:99px;font-size:11px;background:var(--bg3)}
.sw{width:11px;height:11px;border-radius:3px;display:inline-block;margin-right:5px;vertical-align:-1px}
.warn{color:var(--accent2)}
.err{color:var(--missing)}

#drop{position:fixed;inset:0;background:#0af3;backdrop-filter:blur(2px);display:none;align-items:center;justify-content:center;
  font-size:28px;font-weight:700;border:3px dashed var(--accent);z-index:99}
#drop.on{display:flex}
dialog{background:var(--bg2);color:var(--fg);border:1px solid var(--line);border-radius:10px;max-width:640px;padding:20px}
dialog::backdrop{background:#000a}
dialog h3{margin:14px 0 6px;font-size:13px}
dialog li{margin:3px 0;color:var(--muted)}