:root{
  --bg:#14161a; --panel:#1c1f25; --line:#2c313a; --fg:#e8eaee; --muted:#9aa3b0;
  --orange:#FF6200; --ok:#349651; --err:#e0574f;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font:14px/1.5 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  display:flex;flex-direction:column;
}
.bar{
  flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--line);
}
.bar-left{display:flex;align-items:center;gap:10px;min-width:0}
.dot{width:10px;height:10px;border-radius:50%;background:var(--orange);flex:0 0 auto}
.bar .sub{color:var(--muted);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bar-right{display:flex;align-items:center;gap:8px}
.seg{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{
  background:transparent;border:0;color:var(--muted);padding:6px 12px;font:inherit;cursor:pointer;
}
.seg button.on{background:var(--orange);color:#fff;font-weight:600}
button.ghost{
  background:transparent;border:1px solid var(--line);color:var(--fg);
  padding:6px 12px;border-radius:8px;font:inherit;cursor:pointer;
}
button.ghost:hover{border-color:#3d4450}
button.primary{
  background:var(--orange);border:0;color:#fff;font-weight:600;
  padding:8px 16px;border-radius:8px;font:inherit;cursor:pointer;
}
button.primary:hover{background:#e55800}

.split{flex:1 1 auto;display:flex;min-height:0}
.pane-input{
  flex:0 0 420px;display:flex;flex-direction:column;gap:12px;
  padding:16px;background:var(--panel);border-right:1px solid var(--line);min-width:0;
}
body.no-input .pane-input{display:none}
.pane-head h1{margin:0;font-size:15px}
.pane-head p{margin:2px 0 0;color:var(--muted);font-size:13px}
#json{
  flex:1 1 auto;min-height:200px;resize:none;
  background:#12141a;color:#dfe3ea;border:1px solid var(--line);border-radius:8px;padding:12px;
  font:12px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
#json:focus{outline:2px solid var(--orange);outline-offset:-1px}
.pane-actions{display:flex;gap:8px;flex-wrap:wrap}
.status{margin:0;font-size:13px;color:var(--muted);min-height:20px;white-space:pre-wrap}
.status.err{color:var(--err)}
.status.ok{color:var(--ok)}

.pane-preview{flex:1 1 auto;display:flex;flex-direction:column;min-width:0;background:#0f1114}
.canvas{
  flex:1 1 auto;overflow:hidden;display:flex;justify-content:center;align-items:flex-start;
  padding:16px;
}
#frame{
  border:0;background:#fff;border-radius:6px;box-shadow:0 8px 30px rgba(0,0,0,.45);
  width:1440px;height:800px;transform-origin:top center;
}
.disclaimer{
  flex:0 0 auto;margin:0;padding:8px 16px;font-size:12px;color:var(--muted);
  border-top:1px solid var(--line);background:var(--panel);
}
@media (max-width:900px){
  .split{flex-direction:column}
  .pane-input{flex:0 0 auto;border-right:0;border-bottom:1px solid var(--line)}
  #json{min-height:160px}
}