.xbg{--bg:#fafafa;--ink:#0f172a;--muted:#e5e7eb;--card:#ffffff;--accent:#2563eb;--pink:#ec4899;--green:#10b981;--amber:#f59e0b;--blue:#3b82f6;--violet:#7c3aed;color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;position:relative}
.xbg *{box-sizing:border-box}

/* Sticky toolbar */
.xbg #bar{position:sticky;top:0;z-index:20;background:var(--card);border-bottom:1px solid var(--muted);box-shadow:0 8px 20px rgba(0,0,0,.06)}
.xbg .wrap{max-width:1100px;margin:0 auto;padding:10px 12px;display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center}
.xbg .row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.xbg select,.xbg input,.xbg button{font:inherit}
.xbg select,.xbg input[type=number]{padding:6px 8px;border:1px solid var(--muted);border-radius:10px;background:#fff}
.xbg button{border:0;border-radius:10px;padding:8px 12px;background:var(--accent);color:#fff;cursor:pointer}
.xbg .ghost{background:#fff;color:var(--ink);border:1px solid var(--muted)}
.xbg .pill{border-radius:999px;border:1px solid var(--muted);background:#fff;padding:4px 10px;font-size:12px}
.xbg .mini{font-size:12px;padding:6px 9px}
.xbg .ok{background:var(--green);color:#fff}
.xbg .vio{background:var(--violet);color:#fff}

/* Metric cards */
.xbg #cards{background:var(--card);border-top:1px solid var(--muted)}
.xbg .cards-wrap{max-width:1100px;margin:0 auto;padding:8px 12px;display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.xbg .card{background:#fff;border:1px solid var(--muted);border-radius:12px;padding:8px 10px;box-shadow:0 4px 14px rgba(0,0,0,.04)}
.xbg .card h4{margin:0 0 4px 0;font-size:12px;color:#334155}
.xbg .card b{font-size:16px}

/* Sections per mode */
.xbg .section{display:none}
.xbg .show{display:block}

/* Legend */
.xbg #legend{position:fixed;right:12px;bottom:12px;z-index:9;background:#fff;border:1px solid var(--muted);border-radius:12px;padding:8px 10px;font-size:12px;box-shadow:0 6px 18px rgba(0,0,0,.08)}
.xbg #legend .dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:6px}

/* Canvas & helpers */
.xbg canvas{width:100% !important;height:70vh !important;max-height:600px}
.xbg #toast{position:fixed;right:12px;top:12px;background:#111;color:#fff;padding:10px 12px;border-radius:10px;opacity:0;transform:translateY(-8px);transition:all .25s ease;z-index:30;pointer-events:none;max-width:420px}

/* Light grid background (trước là body:before) */
.xbg::before{content:"";position:absolute;inset:0;z-index:-1;background-image:
  linear-gradient(#0000 31px,#eaeaea 32px),
  linear-gradient(90deg,#0000 31px,#eaeaea 32px);
background-size:32px 32px}