/* ---- Mosaico estilo IHG ---- */
    .mosaico-galeria {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 10px;
      max-width: 1040px;
      margin: 0 auto;
    }
    .mosaico-principal {
      border-radius: var(--radius, 12px);
      overflow: hidden;
      aspect-ratio: 4 / 3;
    }
    .mosaico-principal img {
      width: 100%; height: 100%; object-fit: cover;
      transition: opacity 0.15s ease;
      display: block;
    }
    .mosaico-thumbs {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }
    .mosaico-thumb {
      border-radius: calc(var(--radius, 12px) - 4px);
      overflow: hidden;
      aspect-ratio: 1 / 1;
      cursor: pointer;
      border: 2px solid transparent;
      transition: border-color 0.15s ease, transform 0.15s ease;
    }
    .mosaico-thumb:hover { transform: scale(1.02); }
    .mosaico-thumb.active { border-color: var(--green, #17663F); }
    .mosaico-thumb img {
      width: 100%; height: 100%; object-fit: cover; display: block;
    }
    @media (max-width: 640px) {
      .mosaico-galeria { grid-template-columns: 1fr; }
      .mosaico-thumbs { grid-template-columns: repeat(4, 1fr); }
    }

    .serta-hero-txt { text-align: center; max-width: 720px; margin: 0 auto 32px; }
    .serta-hero-txt h1 { font-size: clamp(2rem, 4.5vw, 3rem); margin: 12px 0 14px; }
    .serta-hero-txt p { font-size: 1.0625rem; color: var(--muted); line-height: 1.7; }