:root{
  --paper:#E9EDF0; --panel:#F6F8F9; --ink:#1F2A36; --muted:#5B6877; --line:#CDD5DC;
  --view:#263241; --cobalt:#3E7CB1; --amber:#D9922A; --track:#D6DDE3; --field:#FFFFFF;
  color-scheme:light;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#151C24; --panel:#1C2530; --ink:#E4E9EE; --muted:#9AA7B4; --line:#33404E;
    --view:#10171F; --cobalt:#6FA3D4; --amber:#F0B65A; --track:#33404E; --field:#151C24; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#151C24; --panel:#1C2530; --ink:#E4E9EE; --muted:#9AA7B4; --line:#33404E;
  --view:#10171F; --cobalt:#6FA3D4; --amber:#F0B65A; --track:#33404E; --field:#151C24; color-scheme:dark;
}
*,*::before,*::after{box-sizing:inherit}
html{height:100%}
body{
  margin:0;height:100%;background:var(--paper);color:var(--ink);
  font-family:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  font-size:15px;line-height:1.55;
}
.app{display:grid;grid-template-columns:minmax(0,1fr) 360px;height:100%}
.stage{position:relative;background:var(--view);min-height:0;overflow:hidden}
#gl{display:block;width:100%;height:100%;touch-action:none;cursor:grab}
#gl:active{cursor:grabbing}
.viewtabs{position:absolute;top:12px;left:12px;background:rgba(16,23,31,.6);border-color:rgba(255,255,255,.2)}
.stage .viewtabs button{color:#E4E9EE;padding:7px 12px;white-space:nowrap}
.stage .viewtabs button+button{border-left-color:rgba(255,255,255,.2)}
.stage .viewtabs button[aria-pressed="true"]{background:#E4E9EE;color:#1F2A36}
.infocard{
  position:absolute;right:12px;bottom:12px;min-width:220px;max-width:min(320px,calc(100% - 24px));
  background:rgba(16,23,31,.78);color:#E4E9EE;border-radius:6px;padding:10px 14px;font-size:13px;line-height:1.5
}
.infocard:empty{display:none}
.infocard strong{display:block;font-size:14px;margin-bottom:4px}
.infocard dl{display:grid;grid-template-columns:auto 1fr;gap:2px 12px;margin:0}
.infocard dt{color:#AEBBC8}
.infocard dd{margin:0;font-variant-numeric:tabular-nums}
.hint{position:absolute;left:16px;bottom:14px;margin:0;font-size:13px;color:#C3CDD7;pointer-events:none;opacity:.85}
.drop{
  position:absolute;inset:12px;border:2px dashed var(--amber);border-radius:6px;
  display:none;align-items:center;justify-content:center;color:#F4E3C4;font-size:18px;background:rgba(16,23,31,.55)
}
.stage.dragging .drop{display:flex}
.panel{background:var(--panel);border-left:1px solid var(--line);overflow-y:auto;padding:22px 22px 32px}
h1{font-size:22px;line-height:1.25;font-weight:600;margin:0 0 6px}
.lede{margin:0 0 14px;color:var(--muted);font-size:14px}
h2{font-size:15px;font-weight:600;margin:22px 0 10px;padding-top:16px;border-top:1px solid var(--line)}
.row{display:flex;gap:8px;flex-wrap:wrap}
.btn{
  font:inherit;font-size:14px;font-weight:500;padding:8px 13px;border-radius:4px;cursor:pointer;
  border:1px solid var(--line);background:transparent;color:var(--ink);display:inline-block
}
.btn.primary{background:var(--cobalt);border-color:var(--cobalt);color:#fff}
.btn:hover{border-color:var(--cobalt)}
.btn:disabled{opacity:.5;cursor:default}
.btn.wide{width:100%;margin-top:12px;padding:10px}
.linkbtn{font:inherit;font-size:13px;background:none;border:0;color:var(--cobalt);padding:0;margin:4px 0;cursor:pointer;text-decoration:underline}
.btn:focus-visible,.linkbtn:focus-visible,.seg button:focus-visible,summary:focus-visible{outline:2px solid var(--amber);outline-offset:2px}
input[type=file]{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.subform{margin-top:12px;padding:12px;border:1px solid var(--line);border-radius:6px}
.subform .btn{margin-top:10px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px;margin-top:10px}
label.num{display:flex;flex-direction:column;font-size:13px;gap:4px;color:var(--muted)}
label.num.full{margin-top:4px}
label.num[hidden]{display:none}
label.num input,label.num select{
  font:inherit;font-size:14px;color:var(--ink);background:var(--field);border:1px solid var(--line);border-radius:4px;padding:6px 8px;width:100%
}
label.num input:focus-visible,label.num select:focus-visible{outline:2px solid var(--amber);outline-offset:1px}
label.ctl{display:block;margin:10px 0}
.ctl .top{display:flex;justify-content:space-between;font-size:13.5px}
.ctl output{color:var(--muted);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--cobalt);margin:6px 0 0}
.check{display:flex;align-items:center;gap:8px;margin:8px 0;font-size:13.5px;cursor:pointer}
.check input{accent-color:var(--cobalt);width:16px;height:16px}
.seg{display:flex;border:1px solid var(--line);border-radius:4px;overflow:hidden}
.seg button{flex:1;font:inherit;font-size:13.5px;padding:7px 4px;border:0;background:transparent;color:var(--ink);cursor:pointer}
.seg button+button{border-left:1px solid var(--line)}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--panel)}
details{margin:10px 0}
summary{cursor:pointer;font-size:13.5px;color:var(--muted)}
#depthPreview{width:100%;height:auto;display:block;border-radius:3px;background:var(--track);margin-top:10px}
.scale{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:4px}
.scale .bar{flex:1;margin:7px 8px 0;height:5px;border-radius:3px;background:linear-gradient(90deg,#2F5F8C,#7FA6C4,#F0C27A,#E58A1F)}
.note{font-size:13px;color:var(--muted);margin:8px 0 0}
.status{font-size:13px;color:var(--cobalt);margin:10px 0 0;min-height:1.4em}
.status.error{color:#C0392B}
@media (max-width:820px){
  body{height:auto}
  .app{grid-template-columns:1fr;grid-template-rows:62vh auto;height:auto}
  .panel{border-left:0;border-top:1px solid var(--line)}
  .hint{display:none}
}