.exam-page {
  --exam-sidebar-width: 272px;
}

.exam-main {
  min-width: 0;
}

.exam-sidebar {
  position: relative;
  z-index: 210;
  width: var(--exam-sidebar-width);
  height: 100%;
  flex: 0 0 var(--exam-sidebar-width);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-color);
  background: var(--panel-bg);
  transition: margin-left 0.24s ease;
}

.exam-sidebar.collapsed {
  margin-left: calc(-1 * var(--exam-sidebar-width));
}

.exam-sidebar-header {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 14px 14px 20px;
  border-bottom: 1px solid var(--border-color);
}

.exam-sidebar-header strong,
.exam-sidebar-header span {
  display: block;
}

.exam-sidebar-header strong {
  font-size: 0.96rem;
}

.exam-sidebar-header span {
  margin-top: 3px;
  color: var(--text-muted);
  font-size: 0.68rem;
}

.exam-sidebar-header button {
  width: 40px;
  height: 40px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.exam-sidebar-header button:hover,
.exam-sidebar-header button:focus-visible {
  background: var(--primary-light);
  color: var(--primary-color);
}

.exam-sidebar-header svg {
  width: 18px;
  height: 18px;
}

.exam-sidebar-content {
  min-height: 0;
  overflow-y: auto;
  padding: 8px 16px 24px;
}

.exam-filter-group {
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.exam-filter-group:last-child {
  border-bottom: 0;
}

.exam-filter-group h3 {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 700;
}

.exam-sidebar-options {
  display: grid;
  gap: 4px;
}

.exam-sidebar-options button {
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: var(--text-main);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.exam-sidebar-options button:hover,
.exam-sidebar-options button:focus-visible {
  background: var(--bg-color);
}

.exam-sidebar-options button[aria-pressed="true"] {
  border-color: var(--border-color);
  background: var(--primary-light);
  color: var(--primary-color);
}

.exam-sidebar-overlay {
  display: none;
}

.exam-page-heading h2 {
  margin: 0;
  font-size: 1rem;
}

.exam-page-heading span {
  display: block;
  margin-top: 3px;
  color: var(--text-muted);
  font-size: 0.7rem;
}

.exam-scroll {
  flex: 1;
  min-height: 0;
  height: auto;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.exam-results {
  width: min(940px, calc(100% - 40px));
  margin-inline: auto;
  padding: 30px 0 72px;
}

.exam-results-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--text-main);
}

.exam-title-block {
  min-width: 0;
}

.exam-heading-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

#exam-result-kicker,
#exam-result-count {
  display: none !important;
}

.exam-results-heading span {
  color: var(--primary-color);
  font-size: 0.72rem;
  font-weight: 800;
}

.exam-results-heading h1 {
  margin: 0;
  font-size: clamp(1.42rem, 3.2vw, 1.9rem);
  line-height: 1.15;
  letter-spacing: 0;
}

.exam-paper-section {
  padding-top: 30px;
}

.exam-paper-section > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 0 10px;
  border-bottom: 2px solid var(--text-main);
}

.exam-paper-section > header span {
  flex: 0 0 auto;
  color: var(--text-muted);
  font-size: 0.7rem;
}

.exam-section-heading {
  margin: 0;
  color: var(--text-main);
  font-size: 1rem;
  line-height: 1.5;
}

.exam-question-item {
  display: grid;
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px dashed var(--border-color);
}

.exam-question-line {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 10px;
}

.exam-question-index {
  color: var(--primary-color);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  line-height: 1.75;
}

.exam-question-content {
  min-width: 0;
}

.exam-question-heading {
  display: block;
}

.exam-question-text {
  min-width: 0;
  flex: 1 1 auto;
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.75;
  white-space: pre-line;
  overflow-wrap: break-word;
  word-break: normal;
  text-wrap: pretty;
}

.exam-question-chapter {
  width: max-content;
  max-width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 6px;
  margin-top: 8px;
  padding: 5px 7px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-color);
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.45;
  white-space: nowrap;
}

.exam-question-chapter svg {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  margin-top: 1px;
}

.exam-options {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  color: var(--text-main);
  font-size: 0.86rem;
  line-height: 1.7;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px 14px;
}

.exam-options li {
  padding: 5px 9px;
  border: 1px solid rgba(47, 103, 46, 0.1);
  border-radius: 8px;
  background: rgba(47, 103, 46, 0.035);
}

.exam-options li + li {
  margin-top: 0;
}

.matching-question .exam-question-line {
  grid-template-columns: 2rem minmax(0, 1fr);
}

.exam-matching-board {
  display: grid;
  gap: 14px;
}

.exam-matching-group {
  padding: 12px;
  border: 1px solid rgba(47, 103, 46, 0.14);
  border-radius: 8px;
  background: rgba(47, 103, 46, 0.035);
}

.exam-matching-group header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.exam-matching-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  background: rgba(47, 103, 46, 0.12);
  color: var(--primary-color);
  font-size: 0.72rem;
  font-weight: 800;
}

.exam-matching-title {
  color: var(--text-main);
  font-size: 0.9rem;
  line-height: 1.5;
}

.exam-matching-columns {
  display: grid;
  grid-template-columns: minmax(150px, 0.82fr) minmax(260px, 1.18fr);
  gap: 12px;
  align-items: start;
}

.exam-matching-options,
.exam-matching-prompts {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.exam-matching-options li,
.exam-matching-prompts li {
  display: grid;
  grid-template-columns: 1.65rem minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  min-width: 0;
  font-size: 0.88rem;
  font-weight: 650;
  line-height: 1.55;
}

.exam-matching-options li {
  padding: 6px 8px;
  border-radius: 7px;
  background: #ffffff;
}

.exam-matching-prompts li {
  padding: 5px 0;
}

.exam-matching-option-key,
.exam-matching-prompt-number {
  min-width: 1.55rem;
  height: 1.55rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  font-weight: 850;
  line-height: 1;
}

.exam-matching-option-key {
  background: #ecf7ef;
  color: var(--primary-color);
}

.exam-matching-prompt-number {
  background: #fff1e8;
  color: #f05a28;
}

.exam-answer-block {
  margin-left: 2rem;
}

.exam-answer-details {
  border-top: 1px dashed var(--border-color);
}

.exam-answer-details summary {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--primary-color);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.exam-answer-details summary::-webkit-details-marker {
  display: none;
}

.exam-answer-details summary svg,
.exam-answer-missing svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.exam-answer-text {
  padding: 12px 0 4px;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--text-main);
  white-space: normal;
  overflow-wrap: break-word;
  word-break: normal;
}

.exam-answer-text p {
  margin: 0 0 9px;
}

.exam-answer-text ul,
.exam-answer-text ol {
  padding-left: 22px;
  margin: 8px 0;
}

.exam-answer-text li {
  margin-bottom: 8px;
  line-height: 1.65;
}

.exam-answer-text strong {
  font-weight: 800;
}

.exam-answer-text .answer-structure-label {
  display: inline-block;
  font-weight: 800;
  color: var(--primary-color);
  margin-right: 4px;
}

.exam-answer-text .answer-line {
  display: block;
}

.exam-answer-text .answer-point {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.exam-answer-text .answer-subpoint {
  margin-left: 18px;
}

.exam-answer-text .answer-point-marker {
  min-width: 1.5rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
  border-radius: 7px;
  background: #fff1e8;
  color: #f05a28;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1;
}

.exam-answer-text .answer-subexample {
  margin: 6px 0 8px 12px;
  padding: 6px 12px;
  background: var(--bg-color);
  border-left: 3px solid var(--primary-color);
  border-radius: 4px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.exam-answer-missing {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--text-muted);
  font-size: 0.72rem;
}

.exam-provenance {
  margin-top: 8px;
  padding-top: 9px;
  border-top: 1px dashed var(--border-color);
  color: var(--text-muted);
  font-size: 0.7rem;
}

.exam-provenance p {
  display: flex;
  gap: 7px;
  margin: 0;
  line-height: 1.5;
}

.exam-provenance strong {
  color: var(--text-main);
}

.exam-provenance span {
  overflow-wrap: anywhere;
}

.exam-empty {
  padding: 72px 20px;
  color: var(--text-muted);
  text-align: center;
}

.exam-empty svg {
  width: 34px;
  height: 34px;
}

.exam-empty h2 {
  margin: 12px 0 6px;
  color: var(--text-main);
  font-size: 1rem;
}

.exam-empty p {
  margin: 0;
  font-size: 0.78rem;
}

@media (max-width: 768px) {
  .exam-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, 310px);
    max-width: 100%;
    margin-left: 0;
    padding-top: env(safe-area-inset-top);
    box-shadow: var(--shadow-lg);
    transform: translateX(0);
    transition: transform 0.24s ease;
  }

  .exam-sidebar.collapsed {
    margin-left: 0;
    transform: translateX(-100%);
  }

  .exam-sidebar-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(20, 30, 20, 0.32);
  }

  .exam-sidebar-overlay.open {
    display: block;
  }

  .exam-sidebar-header {
    min-height: 64px;
  }

  .exam-scroll {
    flex: 1;
    min-height: 0;
    height: auto;
  }

  .exam-page-heading span {
    display: none;
  }

  .exam-results {
    width: calc(100% - 18px);
    padding: 14px 12px 24px;
  }

  .exam-results-heading {
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
  }

  .exam-results-heading > div:first-child {
    min-width: 0;
  }

  .exam-heading-actions,
  #toggle-layout-btn {
    display: none !important;
  }

  .exam-results-heading h1 {
    margin: 0;
    font-size: clamp(1.22rem, 5.4vw, 1.48rem);
    line-height: 1.18;
    letter-spacing: 0;
  }

  .exam-paper-section {
    padding-top: 18px;
  }

  .exam-section-heading {
    font-size: 0.92rem;
  }

  .exam-question-line {
    grid-template-columns: 1.9rem minmax(0, 1fr);
    gap: 8px;
  }

  .exam-question-text {
    font-size: 0.93rem;
    line-height: 1.7;
  }

  .exam-question-chapter {
    max-width: 100%;
  }

  .exam-options {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .exam-matching-group {
    padding: 10px;
  }

  .exam-matching-columns {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .exam-matching-options,
  .exam-matching-prompts {
    gap: 5px;
  }

  .exam-matching-options li,
  .exam-matching-prompts li {
    font-size: 0.84rem;
    line-height: 1.5;
  }

  .exam-answer-block {
    margin-left: 1.9rem;
  }

  .exam-answer-text .answer-subpoint {
    margin-left: 10px;
  }
}

/* 铺满全屏的双栏试卷网格布局 (Dual-Column Standard Test Paper Layout) */
.exam-section-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.exam-scroll.dual-column #exam-question-groups {
  display: flex !important;
  flex-direction: column !important;
  gap: 36px !important;
}

.exam-scroll.dual-column .exam-results {
  width: min(1480px, calc(100% - 48px)) !important;
  max-width: 100% !important;
}

.exam-scroll.dual-column .exam-section-grid {
  display: grid !important;
  grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  gap: 24px 32px !important;
  align-items: start !important;
}

@media (max-width: 900px) {
  .exam-scroll.dual-column .exam-section-grid {
    grid-template-columns: 1fr !important;
  }
}

/* v238: unified tablet/sidebar density and calmer exam layout. */
.exam-page {
  --exam-sidebar-width: var(--study-sidebar-width, 292px);
}

.exam-results {
  padding-top: 16px;
}

@media (min-width: 769px) and (max-width: 1180px) {
  .exam-page {
    --exam-sidebar-width: var(--study-sidebar-tablet-width, 246px);
  }

  .exam-sidebar {
    width: var(--exam-sidebar-width) !important;
    flex-basis: var(--exam-sidebar-width) !important;
  }

  .exam-sidebar.collapsed {
    margin-left: calc(-1 * var(--exam-sidebar-width)) !important;
  }

  .exam-sidebar .exam-sidebar-content {
    padding: 8px 10px 18px !important;
    gap: 10px !important;
  }

  .exam-filter-group {
    padding: 10px 0;
  }

  .exam-sidebar-options button {
    min-height: 34px;
    padding: 6px 8px;
    font-size: 0.76rem;
  }

  .exam-results,
  .exam-scroll.dual-column .exam-results {
    width: min(980px, calc(100% - 28px)) !important;
    padding: 14px 0 46px !important;
  }

  .exam-results-heading {
    padding-bottom: 10px;
  }

  .exam-results-heading h1 {
    font-size: clamp(1.24rem, 2.6vw, 1.62rem);
  }

  .exam-paper-section {
    padding-top: 18px;
  }

  .exam-section-grid,
  .exam-scroll.dual-column .exam-section-grid {
    display: flex !important;
    flex-direction: column !important;
    gap: 10px !important;
  }

  .exam-scroll.dual-column #exam-question-groups {
    gap: 22px !important;
  }

  .exam-question-item {
    gap: 9px;
    padding: 14px 0;
  }

  .exam-question-text {
    font-size: 0.92rem;
    line-height: 1.68;
  }

  .exam-options {
    gap: 5px;
    margin-top: 8px;
  }
}

@media (max-width: 768px) {
  .exam-results {
    width: calc(100% - 10px) !important;
    padding: 8px 5px 22px !important;
  }

  .exam-results-heading {
    padding-bottom: 8px;
  }

  .exam-paper-section {
    padding-top: 14px;
  }

  .exam-section-grid {
    gap: 8px;
  }

  .exam-question-item {
    padding: 12px 0;
  }
}