.hpi-summary {
  position: fixed;
  bottom: 12px;
  left: 16px;      /* same horizontal padding as .logo-container */
  color: #ccc;
  font-family: Arial, sans-serif;
  z-index: 500;    /* above graph, below drawers and modals */
  user-select: none;
  pointer-events: none;  /* allow clicks to pass through to graph */
  width: 280px;    /* fixed width to match screenshot */
}
.hpi-title {
  font-size: 12px;
  color: #777;
  margin-bottom: 4px;
  width: 100%;
}
.hpi-numbers {
  display: flex;
  gap: 24px;
  margin-bottom: 6px;
}
.hpi-number {
  flex: 1;
  text-align: center;
}
.hpi-number .value {
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  animation: breathing 3s ease-in-out infinite;
}
.hpi-number .value .decimal {
  font-size: 18px;  /* smaller font for decimal places */
  font-weight: 400;
}
.hpi-number.green .value,
.hpi-number.green .label { color: #4caf50; }
.hpi-number.red .value,
.hpi-number.red .label { color: #f44336; }
.hpi-number .label {
  font-size: 12px;
  text-align: center;
  margin-top: 2px;
}
.hpi-timestamp {
  font-size: 11px;
  color: #888;
  margin-top: 6px;
  width: 100%;     /* match the width of the numbers above */
  text-align: left;
}
@keyframes breathing {
  0%,100% { transform: scale(1); opacity: 1; }
  50%     { transform: scale(1.08); opacity: 0.85; }
}