/* ============================================================
   Single source of truth for the theme accent.
   Shared by the home page (index.html) and every case-study page
   (via @import in case.css). Change the accent here and nowhere else.
   Light = blue sky, dark = icy night-mountain blue (matches the
   background photos). Driven purely by data-theme, no JS.
   ============================================================ */
:root,
html[data-theme="light"] { --accent: #2e6cb0; }
html[data-theme="dark"]  { --accent: #7fb0dd; }