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

.icon {
  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 hides the button's own "?" text node; the ::before glyph
     below carries the visible circled "?" at its own explicit size. */
  font-size: 0;
  color: var(--text-muted);
  cursor: help;
  line-height: 1;
  user-select: none;
  transition: color 0.15s ease;
}

/* The visible affordance: a small circled "?" centred in the 24px target. */
.icon::before {
  content: '?';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid currentColor;
  font-size: 0.65rem;
}

.icon:hover,
.icon[aria-expanded='true'],
.icon:focus-visible {
  color: var(--brand-strong);
}

.tooltip {
  z-index: 9999;
  width: max-content;
  max-width: min(260px, calc(100vw - 24px));
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(var(--shadow-rgb), 0.15);
  padding: 0.6rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.arrow {
  fill: var(--bg-primary);
  stroke: var(--border);
  stroke-width: 1px;
}

.label {
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--text-primary);
}

.plain {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.detail {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.1rem;
}