.timer-stage { isolation: isolate; }
.timer-stage > :not(.music-visuals) { position: relative; z-index: 1; }
.timer-stage > .music-visuals {
    position: absolute;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    border-radius: inherit;
    pointer-events: none;
    opacity: 0.8;
}
.timer-stage .timer-value {
    text-shadow: 0 0 10px var(--phase-bg), 0 0 24px var(--phase-bg), 0 0 40px var(--phase-bg);
}
[data-bs-theme="dark"] .timer-stage > .music-visuals { opacity: 0.9; }
@media (prefers-reduced-motion: reduce) {
    .timer-stage > .music-visuals,
    [data-bs-theme="dark"] .timer-stage > .music-visuals { opacity: 0.45; }
}