:root{
  --bg:#090b10;--panel:#131722;--panel2:#191e2a;--line:#2a3140;
  --text:#f7f8fb;--muted:#9ba4b3;--accent:#665cff;--green:#16885e;--red:#8b3039
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;height:100%}
button,input{font:inherit}
button,.upload{
  background:var(--panel2);color:var(--text);border:1px solid var(--line);
  border-radius:12px;padding:10px 12px;font-weight:700;cursor:pointer
}
button:hover,.upload:hover{filter:brightness(1.1)}
.primary{background:var(--accent);border-color:transparent}
.success{background:var(--green);border-color:#219b6f}
.danger{background:var(--red);border-color:#a9434d}
.accent{background:#332b8c;border-color:#4d44b7}
input[type=file]{display:none}
input[type=range]{width:100%}
.topbar{
  height:70px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;background:#0d1016;position:relative;z-index:30
}
.topbar h1{margin:0;font-size:18px}.topbar p{margin:4px 0 0;color:var(--muted);font-size:12px}
.top-actions{display:flex;gap:8px}
.app{height:calc(100vh - 70px);display:grid;grid-template-columns:250px minmax(0,1fr) 280px}
.sidebar{padding:12px;overflow:auto;background:#10141c}
.sidebar.left{border-left:1px solid var(--line)}
.sidebar.right{border-right:1px solid var(--line)}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:12px;margin-bottom:12px}
.panel h3{margin:0 0 12px;font-size:14px}
.panel label:not(.upload){display:flex;justify-content:space-between;color:#d7dbe5;font-size:12px;margin:12px 0 6px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px}
.layers{display:flex;flex-direction:column;gap:8px;margin-bottom:10px}
.layer-item{display:flex;align-items:center;justify-content:space-between;padding:10px;border:1px solid var(--line);border-radius:12px;background:#171c27;cursor:pointer}
.layer-item.active{outline:2px solid var(--accent)}
.layer-name{font-size:12px;font-weight:700}.layer-type{font-size:10px;color:var(--muted)}
.center{min-width:0;background:#08090c;padding:12px}
.stage-toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
#stage{position:relative;height:calc(100vh - 132px);background:#000;border:1px solid #242936;border-radius:16px;overflow:hidden}
#canvas{width:100%;height:100%;display:block}
#handles{position:absolute;inset:0;pointer-events:none}
.handle{
  position:absolute;width:24px;height:24px;border-radius:50%;background:#00ef8b;border:3px solid white;
  transform:translate(-50%,-50%);pointer-events:auto;touch-action:none;box-shadow:0 0 14px rgba(0,239,139,.7)
}
.empty{position:absolute;inset:0;display:grid;place-content:center;text-align:center;background:radial-gradient(circle,#141827,#08090c 70%);padding:30px}
.empty h2{margin:8px 0}.empty p{color:var(--muted);max-width:420px}.spark{font-size:40px;color:#8179ff}
.hidden{display:none!important}
.maskBtn.active{background:#2d3550}
#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:#171c27;border:1px solid var(--line);padding:10px 14px;border-radius:12px;opacity:0;pointer-events:none;transition:.2s;z-index:100}
#toast.show{opacity:1}
body.presentation .topbar,body.presentation .sidebar,body.presentation .stage-toolbar{display:none!important}
body.presentation .app{display:block;height:100vh}
body.presentation .center{padding:0;height:100vh}
body.presentation #stage{height:100vh;border:0;border-radius:0}
@media(max-width:1050px){
  .app{grid-template-columns:220px minmax(0,1fr)}
  .sidebar.right{grid-column:1/-1;border-right:0;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
  .sidebar.right .panel{margin:0}
}
@media(max-width:760px){
  .app{display:block;height:auto}
  .sidebar{border:0!important}
  .center{padding:10px}
  #stage{height:56vh;min-height:360px}
  .sidebar.right{display:block}
  .topbar{height:auto;padding:12px;gap:10px;align-items:flex-start}
  .top-actions{flex-wrap:wrap;justify-content:flex-end}
}