:root {
  --exercise-stage-background: #e8e8e4;
  --exercise-ink: #182126;
  --exercise-muted: #526068;
  --exercise-line: #b9c2c3;
  --exercise-surface: #fffdf8;
  --exercise-soft: #e5edf0;
  --exercise-primary: #244d63;
  --exercise-primary-dark: #183746;
  --exercise-good: #397054;
  --exercise-bad: #a64e32;
  --exercise-on-primary: #fff;
  --exercise-card-shadow: rgba(24, 33, 38, .16);
  --exercise-radius: 0;
  --exercise-title-font: "Course Source Han Serif", "Source Han Serif CN", "Source Han Serif SC", "Songti SC", STSong, SimSun, serif;
  --exercise-body-font: "Course Source Han Sans", "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

.question-card,
.summary-card,
.choice,
select,
.ordering-item,
.ordering-move,
.navigation button {
  border-width: 2px;
}

.question-card,
.summary-card {
  box-shadow: 0 18px 34px var(--exercise-card-shadow);
}