/* ============================================================
   CppLearner · 期中考试模块样式
   复用主题变量，在 style.css 之后加载
   ============================================================ */

/* ── 整体布局 ── */
.exam-layout {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 48px 120px;
  min-height: calc(100vh - var(--header-h));
}

/* ── 考试概览卡片 ── */
.exam-overview {
  background: var(--paper-warm);
  border: 1px solid var(--paper-line);
  border-radius: 10px;
  padding: 32px 36px;
  margin-bottom: 32px;
  position: relative;
  overflow: hidden;
}

.exam-overview::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: linear-gradient(to bottom, var(--jade), var(--vermilion));
}

.exam-overview-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--ink-deep);
  margin-bottom: 4px;
}

.exam-overview-meta {
  font-size: 13px;
  color: var(--ink-mute);
  margin-bottom: 24px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.exam-score-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.exam-score-big {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 900;
  line-height: 1;
  color: var(--jade);
}

.exam-score-big.warn { color: var(--gold); }
.exam-score-big.bad  { color: var(--vermilion); }

.exam-score-label {
  font-size: 13px;
  color: var(--ink-mute);
  margin-top: 4px;
}

.exam-section-pills {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.exam-section-pill {
  padding: 8px 18px;
  border-radius: 20px;
  background: var(--paper);
  border: 1px solid var(--paper-line);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.exam-section-pill-label {
  color: var(--ink-mute);
  font-weight: 500;
}

.exam-section-pill-score {
  font-family: var(--font-serif);
  font-weight: 700;
}

.exam-section-pill-score.full  { color: var(--jade); }
.exam-section-pill-score.good  { color: var(--gold); }
.exam-section-pill-score.bad   { color: var(--vermilion); }

/* ── 分区选项卡 ── */
.exam-tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 28px;
  background: var(--paper-warm);
  padding: 4px;
  border-radius: 8px;
  border: 1px solid var(--paper-line);
}

.exam-tab {
  flex: 1;
  text-align: center;
  padding: 9px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink-mute);
  transition: all 0.2s;
  user-select: none;
}

.exam-tab:hover { color: var(--ink-deep); }

.exam-tab.active {
  background: var(--paper);
  color: var(--jade);
  box-shadow: 0 1px 4px rgba(26,41,37,0.1);
}

/* ── 单选题卡片 ── */
.exam-mcq-card {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 8px;
  padding: 24px 28px;
  margin-bottom: 16px;
  transition: all 0.25s;
}

.exam-mcq-card.correct-card {
  border-color: var(--jade);
  box-shadow: 0 0 0 1px var(--jade);
}

.exam-mcq-card.wrong-card {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 1px var(--vermilion);
}

.exam-mcq-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 12px;
}

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

.exam-mcq-num.wrong-num { background: var(--vermilion); }

.exam-mcq-score-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  flex-shrink: 0;
}

.exam-mcq-score-badge.full { background: var(--jade-glow); color: var(--jade); }
.exam-mcq-score-badge.zero { background: var(--vermilion-bg); color: var(--vermilion); }

.exam-mcq-stem {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-deep);
  margin-bottom: 16px;
  white-space: pre-wrap;
}

.exam-mcq-stem code {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--code-bg);
  color: #c4ddd2;
  padding: 12px 16px;
  border-radius: 6px;
  margin: 10px 0;
  white-space: pre;
  overflow-x: auto;
}

.exam-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.exam-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  font-size: 14px;
  color: var(--ink-soft);
  background: var(--paper);
  transition: all 0.2s;
  font-family: var(--font-mono);
  font-size: 13.5px;
}

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

.exam-option.opt-correct .exam-opt-mark {
  background: var(--jade);
  color: white;
  border-color: var(--jade);
}

.exam-opt-mark {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2px solid var(--paper-line);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700;
  flex-shrink: 0;
  color: var(--ink-mute);
  font-family: var(--font-sans);
  transition: all 0.2s;
}

.exam-opt-text { flex: 1; padding-top: 1px; }

.exam-reveal-btn {
  font-family: var(--font-sans);
  font-size: 12.5px;
  padding: 6px 16px;
  border-radius: 5px;
  border: 1px solid var(--paper-line);
  background: var(--paper-warm);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.2s;
}

.exam-reveal-btn:hover {
  background: var(--paper-line);
  color: var(--ink-deep);
}

.exam-explanation {
  margin-top: 14px;
  padding: 14px 18px;
  border-radius: 6px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-deep);
  background: var(--jade-glow);
  border-left: 4px solid var(--jade);
  display: none;
}

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

.exam-explanation-label {
  font-family: var(--font-serif);
  font-size: 12px;
  font-weight: 700;
  color: var(--jade);
  letter-spacing: 1px;
  margin-bottom: 6px;
}

/* ── 填空题 ── */
.exam-fillin-card {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 8px;
  padding: 28px 32px;
  margin-bottom: 20px;
}

.exam-fillin-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.exam-fillin-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-deep);
}

.exam-fillin-desc {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 20px;
}

.exam-code-view {
  background: var(--code-bg);
  border-radius: 8px;
  border: 1px solid var(--code-border);
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  color: #c4ddd2;
  white-space: pre;
  overflow-x: auto;
  margin-bottom: 24px;
}

.exam-code-view .blank-marker {
  color: var(--gold);
  font-weight: 700;
}

.exam-blank-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin-bottom: 20px;
}

.exam-blank-table th {
  background: var(--paper-warm);
  color: var(--jade);
  font-weight: 700;
  padding: 9px 14px;
  text-align: left;
  border-bottom: 2px solid var(--jade);
}

.exam-blank-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--paper-line);
  vertical-align: top;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

.exam-blank-table tr:hover td { background: var(--paper-warm); }

.exam-blank-table .col-id    { color: var(--vermilion); font-weight: 700; width: 50px; }
.exam-blank-table .col-right { color: var(--jade); }
.exam-blank-table .col-wrong { color: var(--vermilion); }
.exam-blank-table .col-unknown { color: var(--ink-mute); font-style: italic; }

.exam-result-icon {
  width: 18px; height: 18px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  margin-right: 4px;
  flex-shrink: 0;
}

.icon-correct { background: var(--jade); color: white; }
.icon-wrong   { background: var(--vermilion); color: white; }

.exam-error-notes {
  background: var(--vermilion-bg);
  border-left: 4px solid var(--vermilion);
  padding: 14px 18px;
  border-radius: 0 6px 6px 0;
  font-size: 13px;
  color: var(--ink-deep);
  line-height: 1.85;
}

.exam-error-notes-title {
  font-family: var(--font-serif);
  font-size: 12px;
  font-weight: 700;
  color: var(--vermilion);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

/* ── 程序题 ── */
.exam-prog-card {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 8px;
  padding: 28px 32px;
  margin-bottom: 20px;
}

.exam-prog-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--jade);
  position: relative;
  flex-wrap: wrap;
}

.exam-prog-head::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 50px; height: 2px;
  background: var(--vermilion);
}

.exam-prog-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-deep);
}

.exam-prog-desc {
  background: var(--paper-warm);
  border-left: 4px solid var(--gold);
  padding: 16px 20px;
  border-radius: 0 6px 6px 0;
  margin-bottom: 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-deep);
}

.exam-prog-desc-title {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.exam-io-row {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.exam-io-box {
  flex: 1;
  min-width: 160px;
  background: var(--paper-warm);
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  padding: 12px 16px;
}

.exam-io-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-mute);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.exam-io-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-deep);
  white-space: pre-wrap;
}

.exam-solution-label {
  font-family: var(--font-serif);
  font-size: 12px;
  font-weight: 700;
  color: var(--jade);
  letter-spacing: 2px;
  margin-bottom: 10px;
}

.exam-note-box {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--gold-bg);
  border-left: 3px solid var(--gold);
  border-radius: 4px;
  font-size: 13px;
  color: #7a5a28;
  line-height: 1.7;
}

/* ── 全部题目批量操作 ── */
.exam-section-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 16px;
}

.exam-action-btn {
  font-family: var(--font-sans);
  font-size: 12.5px;
  padding: 6px 16px;
  border-radius: 5px;
  border: 1px solid var(--paper-line);
  background: var(--paper-warm);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.2s;
}

.exam-action-btn:hover {
  background: var(--paper-line);
  color: var(--ink-deep);
}

/* ── 响应式 ── */
@media (max-width: 900px) {
  .exam-layout { padding: 24px 16px 100px; }
  .exam-overview { padding: 20px 20px; }
  .exam-mcq-card { padding: 18px 18px; }
  .exam-fillin-card, .exam-prog-card { padding: 18px 18px; }
  .exam-overview-title { font-size: 20px; }
  .exam-score-big { font-size: 44px; }
  .exam-io-row { flex-direction: column; }
  .exam-blank-table { font-size: 12px; }
  .exam-blank-table td, .exam-blank-table th { padding: 8px 10px; }
}