/* Invert SVGs for dark themes (coal, navy, ayu).
   hue-rotate(180deg) preserves original colors (e.g., blue stays blue) while invert turns white to black. */
html.coal img[src$=".svg"],
html.navy img[src$=".svg"],
html.ayu img[src$=".svg"] {
    filter: invert(100%) hue-rotate(180deg) brightness(1.1) contrast(1.1);
}