:root{
  --bg:#f3f0e8; --panel:#ffffff; --line:#e2dccb; --text:#211f19; --muted:#726c5c;
  --accent:#1c7c6c; --accent2:#c1652f; --accent3:#6a55a0;
  --stage-bg:#14181a; --stage-fog:#14181a; --stage-line:#20262a;
}
:root[data-theme="dark"]{
  --bg:#15181a; --panel:#1b1f22; --line:#292f33; --text:#eceae4; --muted:#8b938c;
  --accent:#33ab97; --accent2:#e08a4c; --accent3:#9683c9;
  --stage-bg:#0e1113; --stage-fog:#0e1113; --stage-line:#1a2023;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#15181a; --panel:#1b1f22; --line:#292f33; --text:#eceae4; --muted:#8b938c;
    --accent:#33ab97; --accent2:#e08a4c; --accent3:#9683c9;
    --stage-bg:#0e1113; --stage-fog:#0e1113; --stage-line:#1a2023;
  }
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg)}
body{
  color:var(--text);font-family:'Inter',system-ui,sans-serif;
  padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
  display:flex;flex-direction:column;height:100%;overflow:hidden;
}
header{
  padding:14px 18px;border-bottom:1px solid var(--line);display:flex;align-items:baseline;gap:10px;flex-shrink:0;
  padding-top:calc(14px + env(safe-area-inset-top,0px));
}
header h1{font-family:'Space Grotesk',sans-serif;font-size:17px;margin:0;font-weight:700;letter-spacing:.2px}
header span{color:var(--muted);font-size:12.5px}
main{flex:1;display:flex;min-height:0}
.panel{
  width:308px;flex-shrink:0;border-right:1px solid var(--line);overflow-y:auto;padding:16px;
  background:var(--panel);
}
.stage{flex:1;position:relative;min-width:0;background:var(--stage-bg)}
#c{width:100%;height:100%;display:block;touch-action:none;cursor:grab}
.empty{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:14px;color:#9aa39e;pointer-events:none;text-align:center;padding:20px;font-size:13.5px}
.empty svg{opacity:.55;color:#4fa593}
.drop{
  border:1.5px dashed var(--line);border-radius:10px;padding:22px 14px;text-align:center;cursor:pointer;
  transition:border-color .15s;margin-bottom:18px;pointer-events:auto;
}
.drop:hover{border-color:var(--accent)}
.drop b{color:var(--text);font-size:13.5px;display:block;margin-bottom:3px}
.drop small{color:var(--muted);font-size:11.5px}
.thumb{width:100%;border-radius:8px;display:block;margin-bottom:18px;border:1px solid var(--line)}
label{display:block;font-size:11.5px;color:var(--muted);margin-bottom:6px;text-transform:none}
label.grp::before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;margin-right:7px;background:var(--dot,var(--accent));vertical-align:1px}
.valline.tint b{color:var(--dot,var(--text))}
input[type=range].t-shape{accent-color:var(--accent)}
input[type=range].t-relief{accent-color:var(--accent2)}
input[type=range].t-surface{accent-color:var(--accent3)}
input[type=range].t-text{accent-color:#c14f7c}
.chk.t-shape input{accent-color:var(--accent)}
.chk.t-relief input{accent-color:var(--accent2)}
.chk.t-surface input{accent-color:var(--accent3)}
.chk.t-text input{accent-color:#c14f7c}
.row{margin-bottom:16px}
.row-h{display:flex;gap:10px}
.row-h .row{flex:1}
select,input[type=number],input[type=text]{
  width:100%;background:var(--bg);border:1px solid var(--line);color:var(--text);border-radius:7px;
  padding:8px 9px;font-family:'IBM Plex Mono',monospace;font-size:13px;
}
select:focus,input:focus{outline:none;border-color:var(--accent)}
input[type=range]{width:100%;accent-color:var(--accent);height:20px}
.valline{display:flex;justify-content:space-between;font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--muted);margin-bottom:4px}
.valline b{color:var(--text);font-weight:600}
.seg{display:flex;border:1px solid var(--line);border-radius:7px;overflow:hidden}
.seg button{
  flex:1;background:none;border:none;color:var(--muted);padding:8px 4px;font-size:12px;cursor:pointer;
  font-family:'Inter',sans-serif;border-right:1px solid var(--line);
}
.seg button:last-child{border-right:none}
.seg button.on{background:var(--accent);color:#fbfaf6;font-weight:600}
.seg.t-text button.on{background:#c14f7c}
.chk{display:flex;align-items:center;gap:8px;font-size:13px;cursor:pointer;user-select:none}
.chk input{accent-color:var(--accent);width:15px;height:15px}
hr{border:none;border-top:1px solid var(--line);margin:18px 0}
.hint{font-size:11px;color:var(--muted);margin-top:6px;line-height:1.5}
button.primary{
  width:100%;background:var(--accent);color:#fbfaf6;border:none;border-radius:8px;padding:12px;
  font-weight:700;font-size:14px;cursor:pointer;font-family:'Space Grotesk',sans-serif;margin-top:4px;
  box-shadow:0 1px 0 rgba(0,0,0,.12) inset;
}
button.primary:disabled{opacity:.4;cursor:not-allowed}
button.primary:active:not(:disabled){transform:scale(.98)}
.meta{position:absolute;left:14px;bottom:14px;font-family:'IBM Plex Mono',monospace;font-size:11px;color:#cfcbc0;
  background:rgba(10,12,13,.55);backdrop-filter:blur(6px);padding:6px 10px 6px 12px;border-radius:6px;pointer-events:none;
  border-left:2px solid var(--accent2)}
.toast{position:absolute;top:14px;right:14px;background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--accent);padding:9px 14px;
  border-radius:7px;font-size:12.5px;opacity:0;transition:opacity .25s;pointer-events:none;color:var(--text)}
.toast.show{opacity:1}

/* ---- viewport toolbar: quick views + turntable + render mode ---- */
.viewToolbar{
  position:absolute;top:14px;left:14px;display:flex;gap:6px;flex-wrap:wrap;max-width:calc(100% - 28px);
}
.viewBtn,.iconBtn{
  background:rgba(20,24,26,.6);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.1);color:#e7e4dc;
  font-family:'IBM Plex Mono',monospace;font-size:11px;padding:6px 10px;border-radius:6px;cursor:pointer;
}
.viewBtn:hover,.iconBtn:hover{border-color:var(--accent)}
.iconBtn.on{background:var(--accent);color:#0e1113;border-color:var(--accent)}
.renderModeBar{
  position:absolute;top:14px;right:14px;display:flex;background:rgba(20,24,26,.6);backdrop-filter:blur(6px);
  border:1px solid rgba(255,255,255,.1);border-radius:6px;overflow:hidden;
}
.renderModeBar button{
  background:none;border:none;color:#c9c5ba;font-family:'IBM Plex Mono',monospace;font-size:11px;padding:6px 10px;cursor:pointer;
}
.renderModeBar button.on{background:var(--accent);color:#0e1113}

@media (max-width:720px){
  main{flex-direction:column}
  .panel{width:100%;height:46%;border-right:none;border-bottom:1px solid var(--line)}
  .stage{height:54%}

  /* stack the two floating toolbars instead of letting them collide side-by-side */
  .viewToolbar{
    top:8px;left:8px;right:8px;max-width:none;
    justify-content:center;
  }
  .viewToolbar .viewBtn,.viewToolbar .iconBtn{flex:1 1 auto;text-align:center;padding:6px 6px}
  .renderModeBar{
    top:auto;bottom:8px;left:8px;right:8px;
    position:absolute;justify-content:center;
  }
  .renderModeBar button{flex:1;padding:7px 4px}

  .meta{left:8px;right:8px;bottom:52px;max-width:none;text-align:center}
  .toast{left:8px;right:8px;top:50%;transform:translateY(-50%);text-align:center}

  /* two-up sliders get tight below ~400px, stack them */
  .row-h{flex-wrap:wrap}
}

@media (max-width:420px){
  .row-h{flex-direction:column;gap:0}
  .row-h .row{flex:none}
  .viewToolbar .viewBtn,.viewToolbar .iconBtn{font-size:10.5px;padding:6px 4px}
}