/* Selected Muse v2 components, independently reviewed. Language display rules excluded. */
body.tma-v2 {
  --tma-paper: #f6f1e8;
  --tma-paper-2: #efe9d8;
  --tma-ink: #22302e;
  --tma-ink-soft: #5a6a67;
  --tma-teal: #1f6f78;
  --tma-teal-deep: #14565d;
  --tma-teal-ink: #0e3f44;
  --tma-teal-soft: #e2efec;
  --tma-gold: #a96d16;
  --tma-gold-soft: #f7ecd2;
  --tma-line: #ddd5bf;
  background: var(--tma-paper);
  color: var(--tma-ink);
  font-size: 17px;
  line-height: 1.7;
}

body.tma-v2 .stage-letter {
  width: 56px; height: 56px;
  font-size: 30px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center; justify-content: center;
  background: var(--tma-teal);
  color: #fff;
  font-weight: 800;
  margin-right: 12px;
  vertical-align: middle;
  box-shadow: 0 6px 16px rgba(31, 111, 120, .3);
}
body.tma-v2 .stage-letter.alert { background: var(--tma-gold); box-shadow: 0 6px 16px rgba(169, 109, 22, .3); }

/* 3 列 brief 网格：等高、序号感 */
body.tma-v2 .stage-brief-grid { gap: 16px; margin-top: 16px; }
body.tma-v2 .stage-brief,
body.tma-v2 .knowledge-card {
  background: var(--tma-teal-soft);
  border-radius: 8px;
  padding: 16px;
  border: none;
  border-left: 4px solid var(--tma-teal);
}
body.tma-v2 .stage-brief strong,
body.tma-v2 .knowledge-card strong { color: var(--tma-teal-ink); }

/* 复评问题行：提出为判断问题卡 */
body.tma-v2 .stage-brief:last-child {
  background: var(--tma-gold-soft);
  border-left-color: var(--tma-gold);
}

body.tma-v2 .course-card {
  border-top: 6px solid var(--tma-gold);
  border-radius: 12px;
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease;
}
body.tma-v2 .course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(31, 42, 55, .12);
}
/* 图形课程视觉：替代原绝对定位背景图（.course-visual 为 flex + min-height 250px，
   原 img 以 absolute inset 0 铺底）。无照片不堆，保持一课一视觉身份。 */
body.tma-v2 .course-visual .tma-card-graphic {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--tma-teal-ink) 0%, var(--tma-teal) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  overflow: hidden;
}
body.tma-v2 .tma-card-graphic::after {
  content: "";
  position: absolute;
  right: -30px; bottom: -30px;
  width: 140px; height: 140px;
  border: 16px solid rgba(169, 109, 22, .3);
  border-radius: 50%;
}
body.tma-v2 .tma-card-graphic .tma-cg-letters {
  display: flex; gap: 8px; z-index: 1;
}
body.tma-v2 .tma-card-graphic .tma-cg-letters b {
  width: 46px; height: 46px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, .12);
  border: 2px solid rgba(255, 255, 255, .5);
  color: #fff; font-size: 22px; font-weight: 800;
}
body.tma-v2 .tma-card-graphic .tma-cg-letters b:first-child {
  background: var(--tma-gold);
  border-color: var(--tma-gold);
  color: var(--tma-teal-ink);
}
body.tma-v2 .tma-card-graphic .tma-cg-word {
  z-index: 1;
  color: #fff;
  font-size: 40px;
  font-weight: 800;
  letter-spacing: .06em;
}
body.tma-v2 .tma-card-graphic .tma-cg-sub {
  position: absolute;
  top: 12px; left: 16px; z-index: 1;
  color: rgba(255, 255, 255, .75);
  font-size: 13px;
  letter-spacing: .1em;
}
/* board-title：仅课程卡图上标题条加强对比（其他处沿用原样式） */
body.tma-v2 .course-visual .board-title {
  background: rgba(14, 63, 68, .92);
  color: #fff;
  padding: 8px 16px;
  border-radius: 6px;
}