/* —— layout base del visor —— */
.ir-viewer{display:grid;grid-template-rows:auto 1fr auto;grid-template-columns:260px 1fr;min-height:100vh}
.ir-toolbar{grid-column:1/3;display:flex;align-items:center;justify-content:space-between;padding:.5rem 1rem;background:#111827;color:#fff}
.ir-title{font-weight:600;margin-left:.5rem}
.ir-left,.ir-right{display:flex;align-items:center;gap:.5rem}
.ir-btn{appearance:none;background:#1f2937;color:#fff;border:0;border-radius:.5rem;padding:.4rem .6rem;cursor:pointer}
.ir-btn:hover{background:#374151}
.ir-toc{grid-row:2/span 2;background:#f3f4f6;border-right:1px solid #e5e7eb;overflow:auto;padding:.75rem;display:none}
.ir-toc.open{display:block}
.ir-toc h3{margin:.25rem 0 .5rem 0;font-size:.9rem;color:#374151}
.ir-toc ul{list-style:none;margin:0;padding:0}
.ir-toc li{margin:0;padding:0}
.ir-toc a{display:block;padding:.35rem .5rem;border-radius:.375rem;color:#111827;text-decoration:none}
.ir-toc a.active,.ir-toc a:hover{background:#e5e7eb}

.ir-stage{grid-column:1/3;background:#fff}
.ir-iframe{display:block;width:100%;height:calc(100vh - 104px);border:0}

.ir-nav{grid-column:1/3;display:flex;align-items:center;justify-content:space-between;padding:.5rem 1rem;border-top:1px solid #e5e7eb;background:#fafafa}
.ir-progress{font-size:.9rem;color:#4b5563}

@media(min-width:920px){
  .ir-stage{grid-column:2/3}
}

.ir-bg-slate-50{background:#f8fafc}.ir-text-slate-900{color:#0f172a}

/* —— estilos inyectados dentro del iframe (referencia) —— */
/* se inyectan desde app.js al cargar cada capítulo */