.flashcard {
  width: 100%;
  min-height: 300px;
  max-height: 66vh;
  background: var(--el-bg-color-overlay);
  border: 1px solid var(--el-border-color-light);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 20px;
  cursor: pointer;
  user-select: none;
  position: relative;
  box-shadow: var(--el-box-shadow-light);
  transition: transform 0.08s;
  overflow-y: auto;
}
.flashcard:active { transform: scale(0.99); }
.fc-index {
  position: absolute; top: 12px; left: 16px;
  font-size: 10.5px; color: var(--el-text-color-secondary);
  font-variant-numeric: tabular-nums;
}
.fc-freq {
  position: absolute; top: 12px; right: 16px;
  font-size: 10px; color: var(--el-text-color-secondary);
  background: var(--el-fill-color-light);
  padding: 3px 7px; border-radius: 99px;
  border: 1px solid var(--el-border-color-lighter);
}
.fc-word { font-size: clamp(28px, 8vw, 42px); font-weight: 700; text-align: center; line-height: 1.12; word-break: break-word; }
.fc-ipa { margin-top: 6px; font-size: 13px; color: var(--el-text-color-secondary); font-family: "Times New Roman", serif; }
.fc-pos { margin-top: 5px; font-size: 11px; color: var(--el-color-warning); font-weight: 600; letter-spacing: 0.5px; }
.fc-meaning { margin-top: 14px; font-size: 19px; color: var(--el-color-primary); font-weight: 600; text-align: center; min-height: 24px; }
.fc-meaning.hidden { opacity: 0; }
.fc-forms { margin-top: 10px; font-size: 11.5px; color: var(--el-text-color-secondary); text-align: center; line-height: 1.6; }
.fc-state { position: absolute; bottom: 10px; font-size: 10px; color: var(--el-text-color-secondary); }

.fc-sent { font-size: clamp(17px, 4.6vw, 22px); line-height: 1.6; text-align: center; font-weight: 500; word-break: break-word; }
.fc-sent b { color: var(--el-color-warning); font-weight: 800; border-bottom: 2px solid var(--el-color-warning); padding-bottom: 1px; }
.fc-sent-cn { margin-top: 12px; font-size: 14px; color: var(--el-text-color-secondary); text-align: center; line-height: 1.6; }
.fc-sent-cn b { color: var(--el-color-primary); font-weight: 800; }
.fc-wordmean { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--el-border-color-light); font-size: 15px; text-align: center; }
.fc-wordmean .w { font-weight: 700; }
.fc-wordmean .m { font-weight: 800; color: var(--el-color-primary); }
.fc-wordmean .p { color: var(--el-text-color-secondary); font-size: 12px; font-family: "Times New Roman", serif; }

.bars { display: flex; align-items: flex-end; gap: 2px; height: 78px; padding-top: 6px; }
.bar-col { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 3px; height: 100%; }
.bar { width: 100%; background: var(--el-color-primary-light-3); border-radius: 2px 2px 0 0; min-height: 2px; }
.bar-lbl { font-size: 8.5px; color: var(--el-text-color-secondary); white-space: nowrap; }

.word-list-table { width: 100%; border-collapse: collapse; }
.word-list-table th, .word-list-table td { padding: 8px 10px; border-bottom: 1px solid var(--el-border-color-lighter); text-align: left; font-size: 13px; }
.word-list-table th { color: var(--el-text-color-secondary); font-weight: 600; }

.quiz-option {
  display: block; width: 100%; text-align: left;
  padding: 13px 14px; border-radius: 11px;
  border: 1px solid var(--el-border-color);
  background: var(--el-bg-color-overlay);
  font-size: 14.5px; color: var(--el-text-color-primary);
  cursor: pointer; margin-bottom: 8px; transition: 0.12s;
}
.quiz-option.correct { background: var(--el-color-success-light-9); border-color: var(--el-color-success); color: var(--el-color-success); font-weight: 600; }
.quiz-option.wrong { background: var(--el-color-danger-light-9); border-color: var(--el-color-danger); color: var(--el-color-danger); }
.quiz-option .k { display: inline-block; width: 19px; color: var(--el-text-color-secondary); font-size: 11.5px; }

.mark-dot { position: absolute; top: 12px; left: 50%; transform: translateX(-50%); display: flex; gap: 4px; }
.dot { width: 7px; height: 7px; border-radius: 50%; }
.dot.red { background: var(--el-color-danger); }
.dot.green { background: var(--el-color-success); }

.m-pos { color: var(--el-color-warning); font-weight: 600; font-style: italic; font-size: 0.72em; letter-spacing: 0.3px; margin-right: 2px; opacity: 0.85; }

.curve-legend { display: flex; gap: 10px; font-size: 10.5px; color: var(--el-text-color-secondary); margin-top: 7px; flex-wrap: wrap; }
.lg { display: flex; align-items: center; gap: 4px; }
.lg i { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.curve-note { font-size: 11px; color: var(--el-text-color-secondary); line-height: 1.75; margin-top: 9px; }

.study-header { display: flex; justify-content: space-between; align-items: baseline; padding: 4px 2px 2px; font-size: 11px; color: var(--el-text-color-secondary); font-variant-numeric: tabular-nums; gap: 6px; }
.auto-bar { height: 3px; background: var(--el-border-color-light); border-radius: 99px; overflow: hidden; margin: 0 2px; }
.auto-fill { height: 100%; background: var(--el-color-primary-light-3); width: 0%; }
.keyboard-hints { margin-top: 18px; text-align: left; }
.keyboard-hint-list { display: flex; flex-wrap: wrap; gap: 10px 16px; color: var(--el-text-color-secondary); font-size: 12px; line-height: 1.8; }
.keyboard-hint-list span { display: inline-flex; align-items: center; gap: 4px; }
kbd { min-width: 22px; padding: 1px 6px; border: 1px solid var(--el-border-color); border-bottom-width: 2px; border-radius: 4px; background: var(--el-fill-color-light); color: var(--el-text-color-primary); font: 11px/1.6 sans-serif; text-align: center; }