site/assets/css/style.css

@@ -450,6 +450,21 @@ section[id] {
   .gym-switch-btn:hover::after,
   .gym-switch-btn:focus-visible::after { transform: scaleX(1); transition: transform 250ms cubic-bezier(.3, .7, .4, 1.5); }
 
+  /* Neon flicker: a stuttering switch-on while it lifts, then steady with the
+     odd short glitch, like a tube that isn't quite seated. Opacity + filter only. */
+  .site-btn:hover,
+  .site-btn:focus-visible,
+  .gym-switch-btn:hover,
+  .gym-switch-btn:focus-visible { animation: neon-flicker-glow 5s linear 150ms infinite; }
+  .site-btn:hover::before,
+  .site-btn:hover::after,
+  .site-btn:focus-visible::before,
+  .site-btn:focus-visible::after,
+  .gym-switch-btn:hover::before,
+  .gym-switch-btn:hover::after,
+  .gym-switch-btn:focus-visible::before,
+  .gym-switch-btn:focus-visible::after { animation: neon-flicker-tube 5s linear 150ms infinite; }
+
   .site-btn:active,
   .gym-switch-btn:active {
     transform: translate(-1px, -1px);
@@ -461,6 +476,26 @@ section[id] {
   .gym-switch-btn:active::after { transform: scaleX(.25); transition-duration: 34ms; }
 }
 
+@keyframes neon-flicker-tube {
+  0%, 4%, 8%, 12%, 100% { opacity: 1; }
+  2%  { opacity: .35; }
+  6%  { opacity: .65; }
+  10% { opacity: .4; }
+  70% { opacity: 1; }
+  71% { opacity: .5; }
+  72% { opacity: 1; }
+  73% { opacity: .6; }
+  74% { opacity: 1; }
+}
+@keyframes neon-flicker-glow {
+  0%, 4%, 8%, 12%, 100% { filter: drop-shadow(0 0 5px rgba(var(--fitme-accent-rgb), .9)) drop-shadow(0 0 14px rgba(var(--fitme-accent-rgb), .55)); }
+  2%  { filter: drop-shadow(0 0 1px rgba(var(--fitme-accent-rgb), .3)); }
+  6%  { filter: drop-shadow(0 0 3px rgba(var(--fitme-accent-rgb), .5)); }
+  10% { filter: drop-shadow(0 0 2px rgba(var(--fitme-accent-rgb), .35)); }
+  71% { filter: drop-shadow(0 0 2px rgba(var(--fitme-accent-rgb), .4)); }
+  73% { filter: drop-shadow(0 0 3px rgba(var(--fitme-accent-rgb), .5)); }
+}
+
 /* Hover: white text on an almost-black face keeping ~10% of the brand colour —
    the bright neon faces around it then stand out against it. The dark and
    ghost variants keep their own backgrounds. */