:root {
  --fondo: #0E1116;
  --fondo-2: #151A22;
  --borde: #232B37;
  --texto: #EDEDED;
  --suave: #98A1B3;
  --acento: #7CE38B;
  --aviso: #FFC94A;
  --azul: #5AB8FF;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--fondo);
  color: var(--texto);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
a { color: var(--azul); }
header.portada {
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  border-bottom: 1px solid var(--borde);
}
header.portada h1 { font-size: clamp(1.8rem, 5vw, 3rem); margin: 0 0 .6rem; }
header.portada p { color: var(--suave); max-width: 46rem; margin: 0 auto; }
nav.indice {
  position: sticky; top: 0; z-index: 10;
  background: rgba(14,17,22,.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--borde);
  padding: .6rem 1rem;
  display: flex; gap: .4rem; flex-wrap: wrap; justify-content: center;
}
nav.indice a {
  color: var(--suave); text-decoration: none;
  padding: .35rem .8rem; border-radius: 999px;
  border: 1px solid var(--borde); font-size: .9rem; white-space: nowrap;
}
nav.indice a:hover { color: var(--texto); border-color: var(--azul); }
nav.indice a.destacado { color: var(--acento); border-color: var(--acento); }
main { max-width: 76rem; margin: 0 auto; padding: 0 1.2rem 5rem; }
section.bloque { padding-top: 3.2rem; }
section.bloque > h2 {
  font-size: clamp(1.3rem, 3.2vw, 1.9rem); margin: 0 0 .3rem;
}
section.bloque > h2 .n {
  color: var(--acento); font-variant-numeric: tabular-nums; margin-right: .5rem;
}
section.bloque > p.resumen { color: var(--suave); margin: 0 0 1.6rem; max-width: 52rem; }
.grilla {
  display: grid; gap: 1.2rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
}
.tarjeta {
  background: var(--fondo-2); border: 1px solid var(--borde);
  border-radius: 12px; overflow: hidden; display: flex; flex-direction: column;
}
.tarjeta video, .tarjeta img { width: 100%; display: block; background: #000; }
.tarjeta .texto { padding: .9rem 1rem 1.1rem; }
.tarjeta h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.tarjeta p { margin: 0; color: var(--suave); font-size: .92rem; }
h3.subtitulo {
  margin: 2.2rem 0 1rem; font-size: 1rem; color: var(--suave);
  text-transform: uppercase; letter-spacing: .08em; font-weight: 600;
}
.laminas { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }
.laminas .tarjeta img { border-bottom: 1px solid var(--borde); }
.descargas { display: flex; gap: .8rem; flex-wrap: wrap; margin-top: .6rem; }
.descargas a { font-size: .85rem; text-decoration: none; border-bottom: 1px dotted; }
.pendiente {
  color: var(--suave); font-style: italic; text-align: center;
  border: 1px dashed var(--borde); border-radius: 12px; padding: 1.4rem;
}
footer {
  border-top: 1px solid var(--borde); padding: 2.5rem 1.5rem;
  text-align: center; color: var(--suave); font-size: .9rem;
}