:root{
  --bg:#0b0f17;
  --panel:#111827;
  --card:#0f172a;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --line:#243049;
  --accent:#60a5fa;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background:var(--bg);
  color:var(--text);
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 18px;
  border-bottom:1px solid var(--line);
  background:rgba(17,24,39,0.7);
  backdrop-filter: blur(8px);
  position:sticky;
  top:0;
  z-index:10;
}

.brand{ display:flex; gap:12px; align-items:center; }
.logo{
  width:34px; height:34px; border-radius:10px;
  background:linear-gradient(135deg, var(--accent), #34d399);
}
.title{ font-weight:700; letter-spacing:0.2px; }
.subtitle{ color:var(--muted); font-size:12px; margin-top:2px; }

.layout{
  display:grid;
  grid-template-columns: 360px 1fr;
  gap:16px;
  padding:16px;
}

.panel{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:14px;
  padding:14px;
  height:calc(100vh - 90px);
  overflow:auto;
}

.panel h2{ margin:14px 0 8px; font-size:14px; color:#cbd5e1; }
.row{ margin:10px 0; }
.hint{ color:var(--muted); font-size:12px; }

.controls{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  align-items:center;
}

.checkbox{
  margin-left:8px;
  color:var(--muted);
  font-size:12px;
}

.btn{
  border:1px solid var(--line);
  background:var(--card);
  color:var(--text);
  padding:8px 10px;
  border-radius:10px;
  cursor:pointer;
}
.btn:disabled{ opacity:0.5; cursor:not-allowed; }

.btnPrimary{
  border-color:rgba(96,165,250,0.45);
  background:rgba(96,165,250,0.15);
}

.kv{
  display:grid;
  grid-template-columns: 110px 1fr;
  gap:8px 10px;
  padding:10px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:12px;
}
.k{ color:var(--muted); font-size:12px; }
.v{ font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New"; font-size:12px; }

.divider{
  height:1px; background:var(--line);
  margin:14px 0;
}

.list{ margin:8px 0 0 18px; color:var(--muted); font-size:13px; }
.list li{ margin:6px 0; }

.stage{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:14px;
  padding:14px;
  display:flex;
  flex-direction:column;
  gap:10px;
}

.videoWrap{ display:none; }
.videoWrap.show{ display:block; }
video{ width:100%; max-height:260px; background:#000; border-radius:12px; border:1px solid var(--line); }

.canvasWrap{
  position:relative;
  width:100%;
  border-radius:12px;
  border:1px solid var(--line);
  overflow:hidden;
  background:#000;
}
canvas{
  width:100%;
  height:auto;
  display:block;
}

.stageHint{
  color:var(--muted);
  font-size:12px;
}

.footer{
  padding:12px 16px;
  color:var(--muted);
  font-size:12px;
  border-top:1px solid var(--line);
}