.fab-gratitude {
  position: fixed; right: 28px; bottom: 28px; z-index: 500;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--ink);
  color: var(--ink);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 22px -6px rgba(11, 11, 20, 0.3);
  cursor: pointer; user-select: none;
  transition: box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.fab-gratitude svg { width: 18px; height: 18px; }
.fab-gratitude:hover {
  background: var(--ink); color: var(--white);
  box-shadow: 0 14px 28px -6px rgba(11, 11, 20, 0.4);
}
.fab-gratitude:active { box-shadow: 0 6px 14px -6px rgba(11, 11, 20, 0.3); }
.fab-gratitude:focus-visible { outline: 2px solid var(--mint, #06b6d4); outline-offset: 3px; }

@media (max-width: 560px) {
  .fab-gratitude { right: 20px; bottom: 24px; width: 44px; height: 44px; }
  .fab-gratitude svg { width: 16px; height: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .fab-gratitude { transition: none; }
}
.fab-gratitude {
  box-shadow: var(--fab-shadow);
}

.fab-gratitude:hover {
  box-shadow: var(--fab-shadow-hover);
}