/* ===== 通用组件 ===== */
.confetti-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.confetti-piece {
  position: absolute;
  display: block;
  border-radius: 3px;
  opacity: 0.7;
  animation: confetti-float 6s ease-in-out infinite;
}
@keyframes confetti-float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-12px) rotate(180deg); }
}

.bg-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.bg-decor-item {
  position: absolute;
  opacity: 0.06;
  user-select: none;
  animation: bg-float 9s ease-in-out infinite;
}
@keyframes bg-float {
  0%, 100% { transform: translateY(0) rotate(-4deg); }
  50% { transform: translateY(-14px) rotate(4deg); }
}