/* V13.6 — Topic cards: fotografías claramente visibles sin alterar la lógica de la app. */
.topic-card-visual{
  isolation:isolate;
  background:#070b12;
}

/* Conserva la línea superior cyber del hover por encima de la fotografía. */
.topic-card-visual.cyber-card::before{
  z-index:3;
}

.topic-card-visual .topic-card-bg{
  position:absolute;
  inset:0;
  z-index:0;
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center;
  pointer-events:none;
  user-select:none;
  opacity:1;
  filter:saturate(1.20) contrast(1.04) brightness(1.22);
  transform:scale(1.01);
  transition:transform .45s cubic-bezier(.16,1,.3,1), opacity .3s ease, filter .3s ease;
}

/* V13.6: la fotografía queda casi libre; el oscurecimiento se concentra abajo,
   donde están contador, botón y QR. */
.topic-card-visual::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    linear-gradient(180deg,
      rgba(3,6,11,.02) 0%,
      rgba(3,6,11,.04) 24%,
      rgba(3,6,11,.09) 48%,
      rgba(3,6,11,.22) 68%,
      rgba(3,6,11,.44) 84%,
      rgba(3,6,11,.58) 100%),
    linear-gradient(90deg,
      rgba(3,6,11,.08) 0%,
      rgba(3,6,11,.015) 48%,
      rgba(3,6,11,.06) 100%);
}

.topic-card-visual > *:not(.topic-card-bg){
  position:relative;
  z-index:2;
}

/* Contraste tipográfico localizado: protege el texto sin tapar toda la imagen. */
.topic-card-visual h1,
.topic-card-visual h2,
.topic-card-visual h3,
.topic-card-visual h4,
.topic-card-visual p,
.topic-card-visual span{
  text-shadow:
    0 3px 12px rgba(0,0,0,.98),
    0 1px 3px rgba(0,0,0,1),
    0 0 2px rgba(0,0,0,1);
}

/* Pequeño colchón solo detrás del título/subtítulo. */
.topic-card-visual .space-y-1{
  position:relative;
}
.topic-card-visual .space-y-1::before{
  content:"";
  position:absolute;
  z-index:-1;
  left:-10px;
  right:-12px;
  top:-8px;
  bottom:-8px;
  border-radius:10px;
  background:linear-gradient(90deg,rgba(2,5,9,.42),rgba(2,5,9,.18) 58%,rgba(2,5,9,0) 100%);
  pointer-events:none;
}

.topic-card-visual:hover .topic-card-bg{
  transform:scale(1.04);
  opacity:1;
  filter:saturate(1.24) contrast(1.04) brightness(1.28);
}

.topic-card-visual[aria-disabled="true"] .topic-card-bg{
  opacity:.82;
  filter:saturate(1.08) contrast(1.03) brightness(1.06);
}

html[data-theme="light"] .topic-card-visual{
  background:#edf2f7;
}

html[data-theme="light"] .topic-card-visual .topic-card-bg{
  opacity:.96;
  filter:saturate(1.10) contrast(1.02) brightness(1.08);
}

html[data-theme="light"] .topic-card-visual::after{
  background:
    linear-gradient(180deg,
      rgba(255,255,255,.00) 0%,
      rgba(255,255,255,.02) 30%,
      rgba(255,255,255,.07) 56%,
      rgba(255,255,255,.18) 76%,
      rgba(255,255,255,.38) 100%),
    linear-gradient(90deg,
      rgba(255,255,255,.06) 0%,
      rgba(255,255,255,0) 52%,
      rgba(255,255,255,.04) 100%);
}

html[data-theme="light"] .topic-card-visual h1,
html[data-theme="light"] .topic-card-visual h2,
html[data-theme="light"] .topic-card-visual h3,
html[data-theme="light"] .topic-card-visual h4,
html[data-theme="light"] .topic-card-visual p,
html[data-theme="light"] .topic-card-visual span{
  text-shadow:0 1px 8px rgba(255,255,255,.94),0 1px 2px rgba(255,255,255,1);
}

html[data-theme="light"] .topic-card-visual .space-y-1::before{
  background:linear-gradient(90deg,rgba(255,255,255,.62),rgba(255,255,255,.26) 60%,rgba(255,255,255,0) 100%);
}

html[data-theme="light"] .topic-card-visual:hover .topic-card-bg{
  opacity:1;
  filter:saturate(1.12) contrast(1.02) brightness(1.11);
}

@media (prefers-reduced-motion: reduce){
  .topic-card-visual .topic-card-bg{transition:none}
  .topic-card-visual:hover .topic-card-bg{transform:scale(1.01)}
}