school_compare/nextjs-app/components/MetricTooltip.module.css

.wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin-left: 0.3em;
}

.icon {
  /* A real button: 24px tap target (WCAG 2.5.8) drawn as the small glyph. */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  min-height: 24px;
  margin: -6px 0;
  padding: 0;
  border: none;
  background: none;
  font-size: 0.9em;
  color: var(--text-muted, #8a7a72);
  cursor: help;
  line-height: 1;
  user-select: none;
  transition: color 0.15s ease;
}

.wrapper:hover .icon,
.icon[aria-expanded="true"] {
  color: var(--accent-coral-dark, #b04a2e);
}

.tooltip {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  width: 220px;
  background: var(--bg-primary, #faf7f2);
  border: 1px solid var(--border-color, #e8ddd4);
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(44, 36, 32, 0.15);
  padding: 0.6rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  pointer-events: none;
  transition: opacity 0.15s ease, visibility 0.15s ease;
}

/* Reveal on hover (desktop), keyboard focus, or explicit tap/click toggle. */
.wrapper:hover .tooltip,
.wrapper:focus-within .tooltip,
.tooltipOpen {
  visibility: visible;
  opacity: 1;
}

.tooltipOpen {
  pointer-events: auto;
}

/* Small arrow pointing down */
.tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--border-color, #e8ddd4);
}

.tooltipLabel {
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--text-primary, #2c2420);
}

.tooltipPlain {
  font-size: 0.75rem;
  color: var(--text-secondary, #5a4a44);
  line-height: 1.4;
}

.tooltipDetail {
  font-size: 0.7rem;
  color: var(--text-muted, #8a7a72);
  line-height: 1.4;
  margin-top: 0.1rem;
}

@media (max-width: 480px) {
  .tooltip {
    width: 180px;
  }
}

/* Anchor the bubble to open rightward on phones — icons follow their labels,
   which start at the left edge, so centring pushed the bubble off-screen. */
@media (max-width: 640px) {
  .tooltip {
    left: -12px;
    right: auto;
    transform: none;
  }

  .tooltip::after {
    left: 16px;
    transform: none;
  }
}