:root {
  color-scheme: light dark;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}
body {
  font-family: "Segoe UI", Roboto, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f5f5;
  color: #222;
}
.helper-tooltip {
  position: fixed;
  max-width: 320px;
  padding: 0.5rem 0.7rem;
  background: rgba(15, 23, 42, 0.95);
  color: #f8fafc;
  border-radius: 8px;
  font-size: 0.78rem;
  line-height: 1.25;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.28);
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 30050;
}
.helper-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}