:root {
  --zen-bg: #111827;
  --zen-bg-hover: #0b1220;
  --zen-accent: #c4b5fd;
  --zen-text: #f8fafc;
  --zen-shadow: 0 10px 25px rgba(0,0,0,.25);
}

/* Контейнер кнопки */
.zen-fab-wrapper {
  position: fixed;
  inset: 50% 16px auto auto;
  transform: translateY(-50%);
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Надпись */
.zen-label {
  pointer-events: auto;
  background: var(--zen-bg);
  color: var(--zen-text);
  font-family: system-ui, sans-serif;
  font-size: 14px;
  padding: 10px 12px;
  border-radius: 999px;
  box-shadow: var(--zen-shadow);
  opacity: 0;
  transform: translateX(10px);
  transition: opacity .25s ease, transform .25s ease;
  white-space: nowrap;
  user-select: none;
}

/* Кнопка */
.zen-fab {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: var(--zen-bg);
  color: var(--zen-text);
  box-shadow: var(--zen-shadow);
  cursor: pointer;
  position: relative;
  outline: none;
  transition: transform .15s ease, background .2s ease, box-shadow .2s ease;
}

.zen-fab:hover,
.zen-fab:focus-visible {
  background: var(--zen-bg-hover);
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 14px 35px rgba(0,0,0,.3);
}

/* Анимация дыхания */
.zen-fab::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(196,181,253,.45);
  animation: zen-breathe 3.2s ease-in-out infinite;
  pointer-events: none;
}

@keyframes zen-breathe {
  0%, 100% { box-shadow: 0 0 0 0 rgba(196,181,253,.0); }
  50% { box-shadow: 0 0 0 14px rgba(196,181,253,.12); }
}

@media (prefers-reduced-motion: reduce) {
  .zen-fab { transition: none; }
  .zen-fab::after { animation: none; }
  .zen-label { transition: none; }
}

/* Показываем надпись при наведении на весь блок */
.zen-fab-wrapper:hover .zen-label,
.zen-fab-wrapper:focus-within .zen-label,
.zen-wrapper-hover .zen-label {
  opacity: 1;
  transform: translateX(0);
}

/* Мобильная адаптация */
@media (max-width: 768px) {
  .zen-fab-wrapper {
    inset: