html,
body {
  height: 100%;
}

body {
  background: #fafafa;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  margin: 0;
  color: #1a1a1a;
}

#jspsych-target {
  min-height: 100vh;
}

.jspsych-content {
  max-width: 960px;
}

.center-screen {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.exp-wrap {
  max-width: 820px;
  margin: 0 auto;
  line-height: 1.75;
  font-size: 18px;
  text-align: left;
}

.exp-wrap h2,
.exp-wrap h3 {
  margin-top: 0;
  font-weight: 600;
}

.feedback {
  font-size: 36px;
  font-weight: 700;
}

.fb-correct {
  color: #2e7d32;
}

.fb-wrong {
  color: #c62828;
}

.fb-slow {
  color: #f57c00;
}

.fixation {
  font-size: 48px;
  font-weight: 700;
  text-align: center;
  line-height: 1;
  color: #333;
}

.stim-wrap {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}

#stim-canvas {
  width: 720px;
  height: 520px;
  display: block;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.trial-progress {
  margin-top: 14px;
  font-size: 16px;
  color: #555;
}

.prompt-keys {
  margin-top: 8px;
  font-size: 15px;
  color: #444;
}

.jspsych-btn {
  padding: 10px 22px;
  font-size: 16px;
}