:root{
  --bg:#0f1720;
  --card:#0b1220;
  --muted:#94a3b8;
  --accent:#60a5fa;
  --panel:#071029;
}
body{font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial; background:linear-gradient(180deg,#071225 0%,#071029 100%); color:#e6eef8; margin:0; padding:24px}
.container{max-width:1000px;margin:0 auto}
header h1{margin:0 0 6px 0;font-weight:600}
.controls{margin-top:12px;padding:12px}
.row{display:flex;gap:12px;align-items:center;margin-bottom:10px}
.file input{display:block}
input[type="file"]{color:var(--muted)}
input[type=text], input[type=email], input, textarea{background:transparent;border:1px solid rgba(255,255,255,0.06);color:inherit;padding:8px;border-radius:6px;outline:none}
button{background:var(--accent);border:none;padding:8px 12px;border-radius:6px;color:#04233a;cursor:pointer}
.expr-row input{flex:1}
.main{display:flex;gap:16px;margin-top:18px}
.panel{flex:1;background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:12px;border-radius:8px;border:1px solid rgba(255,255,255,0.03)}
.panel h3{margin:0 0 8px 0;font-size:14px;color:var(--muted)}
.out{min-height:120px;white-space:pre-wrap;font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;background:#03101a;padding:8px;border-radius:6px}
.table-preview{margin-top:10px;overflow:auto}
.table-preview table{width:100%;border-collapse:collapse;background:rgba(255,255,255,0.02)}
.table-preview th,.table-preview td{border:1px solid rgba(255,255,255,0.03);padding:6px;text-align:left;font-size:13px}
.demos{display:flex;gap:8px;align-items:center}
.demo-btn{background:transparent;border:1px solid rgba(255,255,255,0.06);color:var(--accent);padding:6px 8px;border-radius:6px}
.hint{margin-top:6px;color:var(--muted);font-size:12px}
footer{margin-top:14px;color:var(--muted);font-size:12px}