/* ============================================================
   CppLearner · 选择题训练模块样式
   ============================================================ */

/* ── 主布局 ── */
.qz-layout {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 48px 120px;
  min-height: calc(100vh - var(--header-h));
}

/* ── 头部 ── */
.qz-header {
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--jade);
  position: relative;
}
.qz-header::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 50px; height: 2px;
  background: var(--vermilion);
}

.qz-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

.qz-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--ink-deep);
}

.qz-progress-pill {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 5px 16px;
  border-radius: 20px;
  background: var(--jade-glow);
  color: var(--jade);
  font-weight: 500;
  letter-spacing: 0.5px;
}

.qz-progress-bar {
  margin-top: 16px;
  height: 4px;
  background: var(--paper-line);
  border-radius: 2px;
  overflow: hidden;
}

.qz-progress-fill {
  height: 100%;
  background: var(--jade);
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* ── 题目卡片 ── */
.qz-card {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 10px;
  padding: 32px 36px;
  margin-bottom: 24px;
  box-shadow: 0 2px 12px rgba(26,41,37,0.05);
  transition: all 0.3s;
}

.qz-card.answered-correct {
  border-color: var(--jade);
  box-shadow: 0 0 0 1px var(--jade), 0 2px 12px rgba(45,90,74,0.1);
}

.qz-card.answered-wrong {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 1px var(--vermilion), 0 2px 12px rgba(184,65,44,0.1);
}

/* ── 题号与话题标签 ── */
.qz-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.qz-num {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--paper);
  background: var(--jade);
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.qz-topic-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 3px;
  background: var(--paper-warm);
  color: var(--ink-mute);
  border: 1px solid var(--paper-line);
  letter-spacing: 0.5px;
}

/* ── 题干 ── */
.qz-stem {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-deep);
  margin-bottom: 20px;
  white-space: pre-wrap;
}

/* ── 选项列表 ── */
.qz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qz-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  background: var(--paper);
}

.qz-option:hover {
  border-color: var(--jade);
  background: var(--jade-glow);
  color: var(--ink-deep);
}

.qz-option.selected {
  border-color: var(--jade);
  background: var(--jade-glow);
  color: var(--ink-deep);
  font-weight: 500;
}

.qz-option.correct {
  border-color: var(--jade);
  background: rgba(45,90,74,0.12);
}
.qz-option.correct .qz-option-mark { background: var(--jade); color: white; }

.qz-option.wrong {
  border-color: var(--vermilion);
  background: var(--vermilion-bg);
}
.qz-option.wrong .qz-option-mark { background: var(--vermilion); color: white; }

.qz-option.disabled {
  pointer-events: none;
  opacity: 0.85;
}

.qz-option-mark {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 2px solid var(--paper-line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  transition: all 0.2s;
  color: var(--ink-mute);
}

.qz-option.selected .qz-option-mark {
  border-color: var(--jade);
  background: var(--jade);
  color: white;
}

.qz-option-text {
  flex: 1;
  padding-top: 1px;
}

/* ── 解析框 ── */
.qz-explanation {
  margin-top: 16px;
  padding: 16px 20px;
  border-radius: 6px;
  font-size: 13.5px;
  line-height: 1.85;
  display: none;
}

.qz-explanation.show { display: block; }

.qz-explanation.correct-exp {
  background: var(--jade-glow);
  border-left: 4px solid var(--jade);
  color: var(--ink-deep);
}

.qz-explanation.wrong-exp {
  background: var(--vermilion-bg);
  border-left: 4px solid var(--vermilion);
  color: var(--ink-deep);
}

.qz-explanation-label {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 6px;
}
.correct-exp .qz-explanation-label { color: var(--jade); }
.wrong-exp .qz-explanation-label { color: var(--vermilion); }

/* ── 底部操作栏 ── */
.qz-bottom-bar {
  position: sticky;
  bottom: 0;
  padding: 20px 0;
  background: linear-gradient(to top, var(--paper) 70%, rgba(250,246,238,0));
  display: flex;
  justify-content: center;
  gap: 14px;
  z-index: 10;
}

/* ── 结果总结 ── */
.qz-result {
  text-align: center;
  padding: 48px 32px;
  background: var(--paper-warm);
  border-radius: 12px;
  margin: 40px 0;
  border: 1px solid var(--paper-line);
}

.qz-result-score {
  font-family: var(--font-serif);
  font-size: 64px;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 8px;
}
.qz-result-score.perfect { color: var(--jade); }
.qz-result-score.good { color: var(--gold); }
.qz-result-score.bad { color: var(--vermilion); }

.qz-result-label {
  font-size: 15px;
  color: var(--ink-mute);
  margin-bottom: 24px;
}

.qz-result-detail {
  display: flex;
  justify-content: center;
  gap: 32px;
  font-size: 14px;
  color: var(--ink-soft);
}

.qz-result-detail strong {
  font-family: var(--font-serif);
  font-size: 22px;
  display: block;
  margin-bottom: 2px;
}

/* ── 响应式 ── */
@media (max-width: 768px) {
  .qz-layout { padding: 24px 16px 100px; }
  .qz-card { padding: 20px 18px; }
  .qz-title { font-size: 22px; }
}