/* Theme: Blueprint — cool graphite, steel-blue accent, faint engineering grid,
   code-comment section markers. */
:root {
  --bg:        #0f141b;
  --bg-soft:   #161d27;
  --border:    #26313f;
  --text:      #c3ccd6;
  --text-dim:  #7d8a99;
  --heading:   #eef3f8;
  --accent:    #5aa9e6;
  --accent-dim:#3f86c4;
  --link:      #8ac0f0;

  --h2-prefix: "// ";
  --tree-marker: "— ";
}

/* barely-there blueprint grid — decorative, hidden in print */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(90, 169, 230, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(90, 169, 230, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
}