/* Agent de décoration saisonnière — styles */
html[data-season] .site-header {
  border-bottom-color: var(--season-accent, var(--line));
}

#season-particles {
  position: fixed;
  inset: 0;
  z-index: 5;
  overflow: hidden;
  pointer-events: none;
}
.season-particle {
  position: absolute;
  top: -10%;
  opacity: 0.75;
  line-height: 1;
  animation: season-fall linear infinite;
  will-change: transform;
  user-select: none;
}
@keyframes season-fall {
  from {
    transform: translateY(-10vh) rotate(0deg);
  }
  to {
    transform: translateY(110vh) rotate(360deg);
  }
}

.season-toggle {
  position: fixed;
  z-index: 13;
  left: 20px;
  bottom: 80px;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--season-accent, var(--coral));
  border-radius: 50%;
  color: var(--ink);
  background: rgba(247, 244, 239, 0.9);
  backdrop-filter: blur(4px);
  box-shadow: 0 6px 18px rgba(32, 34, 30, 0.18);
  font-size: 18px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.season-toggle:hover,
.season-toggle:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

@media (prefers-reduced-motion: reduce) {
  .season-particle {
    animation: none;
    display: none;
  }
}