.mystery-sign {
  position: fixed;
  top: 0;
  left: 0;
  --sign-size: 80px;
  --sign-stroke: 2px;
  width: var(--sign-size);
  height: calc(var(--sign-size) * 2.2);
  opacity: 0;
  transition: opacity 0.3s linear;
  will-change: transform, opacity;
  pointer-events: none;
}

.mystery-sign-post {
  position: absolute;
  left: 50%;
  top: var(--sign-size);
  width: var(--sign-stroke);
  height: calc(var(--sign-size) * 1.2);
  background: var(--ink);
  transform: translateX(-50%);
}

.mystery-sign-disc {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--sign-size);
  height: var(--sign-size);
  background: var(--paper);
  border: var(--sign-stroke) solid var(--ink);
  border-radius: 50%;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  transition: transform 0.15s ease, background 0.15s ease;
  user-select: none;
  -webkit-user-select: none;
}

.mystery-sign-disc.tapped {
  background: var(--ink);
  color: var(--paper);
  transform: scale(0.92);
}

.mystery-sign-disc.inviting:not(.tapped) {
  animation: sign-pulse 1.6s ease-in-out infinite;
}

@keyframes sign-pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.08); }
}

.mystery-sign-disc .material-symbols-outlined {
  font-size: calc(var(--sign-size) * 0.65);
  font-variation-settings: 'FILL' 1, 'wght' 700, 'GRAD' 0, 'opsz' 48;
  line-height: 1;
}

/* Tooltip : taille de texte réduite, plus discret et lisible */
.mystery-sign-tooltip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(8px) scale(0.9);
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 12px;
  padding: 9px 14px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  max-width: 220px;
  white-space: normal;
  text-align: center;
  line-height: 1.35;
}

.mystery-sign-tooltip.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
}

.mystery-sign-tooltip-arrow {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 8px;
  pointer-events: none;
}

.mystery-sign-tooltip-arrow::before,
.mystery-sign-tooltip-arrow::after {
  content: '';
  position: absolute;
  left: 0;
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
}

.mystery-sign-tooltip-arrow::before {
  top: 0;
  border-top: 8px solid var(--ink);
}

.mystery-sign-tooltip-arrow::after {
  top: -2px;
  border-top: 8px solid var(--paper);
}

.mystery-sign-tooltip-text {
  position: relative;
}

@media (prefers-reduced-motion: reduce) {
  .mystery-sign-disc.inviting { animation: none; }
  .mystery-sign-tooltip { transition: opacity 0.2s linear; }
}