html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

h1 {
  margin-top: 24px;
  margin-bottom: 16px;
  font-size: 1.8rem;
  text-align: center;
}

.title-box {
  border: 1px solid var(--border-color);
  margin-bottom: 16px;
}

.title-content {
  --duty: 50%;

  padding: 12px 24px;

  background: linear-gradient(
    90deg,
    #000000 0%,
    #000000 var(--duty),
    #ffffff var(--duty),
    #ffffff 100%
  );
}

.duty-title {
  margin: 0;
  font-size: 1.8rem;
  font-weight: 600;

  background: linear-gradient(
    90deg,
    #ffffff 0%,
    #ffffff var(--duty),
    #000000 var(--duty),
    #000000 100%
  );

  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#stimulus {
  width: 300px;
  height: 300px;
  background: white;
  margin-top: 24px;
  border: 1px solid var(--border-color);
}

#controls {
  margin-top: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.control-row input[type="number"] {
  width: 80px;
  padding: 4px;
  font-size: 0.9rem;
}