/* Tarjetas de temas: el listado compacto del selector de lectura se conserva. */
.unit-overview{margin:26px 0 20px;padding:20px 24px;background:var(--soft);border-inline-start:3px solid var(--accent);border-radius:0 12px 12px 0}
.unit-overview h2{margin:8px 0 12px}
.unit-overview p:last-child{margin-bottom:0}
.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;list-style:none;padding:0;margin:0}
.topic-grid>li{min-width:0;display:flex}
.topic-card{display:flex;flex-direction:column;gap:15px;width:100%;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--ink);text-decoration:none;overflow-wrap:anywhere}
.topic-card:hover{border-color:var(--accent)}
.topic-card:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.topic-card-meta,.topic-card-footer{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px 12px}
.topic-number{font-size:12px;line-height:1.5;font-weight:700;padding:4px 9px;border-radius:6px;background:var(--soft);color:var(--accent)}
.topic-card-code{font-size:12px;color:var(--muted)}
.topic-card h3{font-size:18px;line-height:1.45;margin:0}
.topic-card-footer{margin-top:auto;padding-top:5px;font-size:13px}
.topic-card-status{color:var(--muted)}
.topic-card.is-reviewed .topic-card-status{color:var(--accent);font-weight:600}
.topic-card-open{color:var(--accent);font-weight:600}
@media(min-width:1500px){.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:1000px) and (min-width:821px){.topic-grid{grid-template-columns:minmax(0,1fr)}}
@media(max-width:600px){.topic-grid{grid-template-columns:minmax(0,1fr)}.topic-card,.unit-overview{padding:18px}}
@media print{.unit-overview{background:none;border:0;padding:0}.topic-grid{display:block}.topic-card{break-inside:avoid;margin:12px 0}.topic-card-open{display:none}}