.liquid-glass {
  position: relative;
  padding: 2rem;
  border-radius: 20px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px) saturate(180%);
  -webkit-backdrop-filter: blur(10px) saturate(180%);
  border: 1px solid rgba(255,255,255,0.5);
  box-shadow:
    0 8px 32px rgba(31,38,135,0.2),
    inset 0 4px 20px rgba(255,255,255,0.3);
  filter: url(#liquid-filter);
  overflow: hidden;
}

.liquid-glass::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at top left, rgba(255,255,255,0.3), transparent 60%);
  filter: blur(50px);
  transform: translateX(-50%) translateY(-50%);
  animation: shine 5s infinite linear;

  pointer-events: none; /* ← これが重要 */
  z-index: 0; /* 必ずボタンより背面に */
}

@keyframes shine {
  to {
    transform: translateX(50%) translateY(50%);
  }
}

.content {
  position: relative;
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}