/* Shared pale stone finish for the eight reference-based columns. */
img[src*="assets/columnas-historicas/"]{
 --stone-exposure:1.18;
 filter:grayscale(1) sepia(.055) brightness(var(--stone-exposure)) contrast(.78);
}
img[src$="/egipto.png"]{--stone-exposure:1.55}
img[src$="/gotico.png"]{--stone-exposure:1.35}
img[src$="/roma.png"]{--stone-exposure:1.26}
img[src$="/trajano.png"],img[src$="/trajano-sin-base.png"]{--stone-exposure:1.24}