:root{
  /* Depth on black comes from hairlines + glow, not soft grey shadows. */
  --shadow-sm:0 1px 2px rgba(0,0,0,.6);
  --shadow-md:0 6px 20px rgba(0,0,0,.55);
  --shadow-lg:0 22px 60px rgba(0,0,0,.65);
  --shadow-inset-top:inset 0 1px 0 rgba(255,255,255,.06);
  --shadow-inset-edge:inset 0 0 0 1px rgba(255,255,255,.05);

  --glow-cyan:0 0 0 1px rgba(34,200,255,.5),0 0 24px rgba(34,200,255,.35);
  --glow-magenta:0 0 0 1px rgba(255,59,212,.5),0 0 24px rgba(255,59,212,.35);
  --glow-soft:0 0 32px rgba(34,200,255,.18);
  --glow-focus:0 0 0 2px var(--surface-page),0 0 0 4px var(--neon-cyan);
}