body {
  background: #0f172a;
  color: #e5e7eb;
  font-family: Arial, sans-serif;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 30px;
  text-align: center;
}

.hidden {
  display: none;
}

.stimuli {
  display: flex;
  justify-content: space-around;
  margin: 25px 0;
}

.label {
  margin-bottom: 10px;
  font-weight: bold;
}

svg {
  background: transparent;
}

circle {
  fill: #7dd3fc;
}

#outerCircle,
#refOuterCircle {
  fill: none;
  stroke: #94a3b8;
  stroke-width: 4;
}

input[type=range] {
  width: 65%;
  margin: 20px 0;
}

button {
  padding: 10px 18px;
  font-weight: bold;
  cursor: pointer;
}

.stats {
  max-width: 550px;
  margin: 0 auto 20px;
  text-align: left;
}

.formula {
  font-size: 14px;
  font-style: italic;
  color: #cbd5f5;
}

table {
  width: 80%;
  margin: 20px auto;
  border-collapse: collapse;
}

th, td {
  border: 1px solid #334155;
  padding: 6px;
}

.hint {
  font-style: italic;
  color: #cbd5f5;
}

.interpretation {
  margin-top: 15px;
  font-style: italic;
  color: #e0f2fe;
}