:root {
  color-scheme: light;
  --bg: #f5f0e8;
  --panel: #ffffff;
  --line: rgba(46, 52, 64, 0.1);
  --line-strong: rgba(46, 52, 64, 0.16);
  --text: #22252b;
  --muted: #7c7f87;
  --accent: #232323;
  --soft: #f1f3f6;
  --right: #2c7a54;
  --wrong: #b13d3d;
  --brand: #235d89;
  --brand-soft: #dce9f7;
  --shadow: 0 10px 30px rgba(34, 38, 46, 0.05);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #fcfaf7 0%, var(--bg) 100%);
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
}

button,
select,
input {
  font: inherit;
}

.page-shell {
  width: min(760px, calc(100vw - 24px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.hero {
  margin-bottom: 20px;
}

.hero-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
}

.breadcrumb {
  margin: 0;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  font-variant-numeric: tabular-nums;
}

.hero h1 {
  margin: 10px 0 8px;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: clamp(2rem, 3.8vw, 2.7rem);
  line-height: 1.2;
  font-weight: 600;
}

.page-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.hero-progress {
  margin-top: 14px;
}

.hero-progress-track {
  width: 100%;
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(32, 32, 32, 0.08);
}

.hero-progress-bar {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 220ms ease;
}

.hero-progress-text {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  font-variant-numeric: tabular-nums;
}

.content-grid {
  display: block;
}

.question-panel {
  padding: 0;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.toolbar-stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.9rem;
}

.toolbar-stats strong {
  color: var(--text);
  font-weight: 600;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.view-switch {
  display: flex;
  gap: 8px;
}

.view-switch .is-active {
  background: var(--accent);
  color: #fff;
}

.page-size-select {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 0.88rem;
}

.page-size-select select {
  min-width: 72px;
  padding: 8px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
}

#grade-select,
#semester-select {
  min-width: 88px;
}

.primary-button,
.secondary-button {
  padding: 9px 14px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background-color 180ms ease;
}

.primary-button {
  background: var(--accent);
  color: #fff;
}

.secondary-button {
  background: #fff;
  color: var(--text);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.status-banner {
  min-height: 20px;
  margin: 10px 0 14px;
  color: var(--muted);
  font-size: 0.88rem;
}

.secondary-link {
  color: var(--text);
  text-decoration: none;
}

.hero-actions .secondary-link {
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
  font-size: 0.88rem;
  transition: all 180ms ease;
}

.hero-actions .secondary-link:hover {
  background: var(--soft);
  border-color: var(--accent);
}

.status-banner.is-error {
  color: var(--wrong);
}

.result-panel {
  margin: 12px 0 20px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow);
}

.result-summary {
  display: grid;
  grid-template-columns: 1.2fr 1fr auto;
  gap: 18px;
  align-items: start;
}

.summary-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.85rem;
}

.score-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.score-value strong {
  font-size: clamp(3.2rem, 7vw, 4.4rem);
  line-height: 0.95;
  font-weight: 700;
}

.score-value span {
  color: var(--muted);
}

.summary-meta {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.score-level {
  display: block;
  font-size: 2rem;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
}

.result-actions {
  display: grid;
  gap: 10px;
  min-width: 140px;
}

.result-bar {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 6px;
  margin-top: 18px;
}

.result-segment {
  height: 8px;
  border-radius: 999px;
  background: var(--line);
}

.result-segment.is-correct {
  background: #3ca36a;
}

.result-segment.is-wrong {
  background: #c45945;
}

.question-list {
  display: grid;
  gap: 18px;
}

.submit-bar {
  display: flex;
  justify-content: center;
  margin-top: 18px;
}

.submit-main {
  min-width: 180px;
  padding-inline: 28px;
}

.question-card,
.records-panel {
  position: relative;
  padding: 28px 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow);
}

.question-card.is-correct {
  border-color: rgba(44, 122, 84, 0.32);
}

.question-card.is-wrong {
  border-color: rgba(177, 61, 61, 0.28);
}

.question-card.is-result {
  padding-top: 24px;
}

.question-heading {
  display: grid;
  gap: 14px;
  padding-top: 6px;
}

.question-heading-line {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  min-height: 32px;
}

.question-index {
  color: #7e807f;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.question-tag {
  margin: 0;
  padding: 5px 12px;
  border-radius: 999px;
  background: #f2f3f5;
  color: #686f7a;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.question-state {
  padding: 4px 12px;
  border-radius: 999px;
  background: #e8f0fa;
  color: #456889;
  font-size: 0.78rem;
  font-weight: 600;
}

.question-meta {
  display: none;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.question-title {
  margin: 4px 0 0;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 1.5rem;
  line-height: 1.55;
  font-weight: 500;
  white-space: pre-line;
}

.options {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.option {
  position: relative;
}

.option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.option label {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 72px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.option label::before {
  content: attr(data-option-label);
  width: 38px;
  height: 38px;
  flex: none;
  display: grid;
  place-items: center;
  border: 1.5px solid rgba(69, 77, 89, 0.18);
  border-radius: 50%;
  color: #5d6470;
  background: #fff;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 0.94rem;
}

.option-label-text {
  flex: 1;
  font-size: 1rem;
  line-height: 1.6;
  white-space: pre-line;
}

.option input:checked + label {
  border-color: var(--brand);
  box-shadow: inset 0 0 0 2px var(--brand);
  background: var(--brand-soft);
}

.option input:checked + label::before {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
}

.option.is-judge-selected label::before {
  content: "✓";
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
}

.option.is-judge-unselected label::before {
  content: "";
  color: #b7bcc3;
}

.option label:hover,
.blank-input:hover,
.blank-input:focus {
  border-color: rgba(35, 93, 137, 0.38);
}

.option.is-answer label {
  border-color: rgba(44, 122, 84, 0.32);
  background: rgba(44, 122, 84, 0.08);
}

.option.is-user-wrong label {
  border-color: rgba(177, 61, 61, 0.28);
  background: rgba(177, 61, 61, 0.07);
}

.option.is-user-correct label::after,
.option.is-answer label::after,
.option.is-user-wrong label::after {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.82rem;
  white-space: nowrap;
}

.option.is-answer label::after {
  content: "正确答案";
}

.option.is-user-correct label::after {
  content: "你的答案";
}

.blank-fields {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.blank-field {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.blank-field-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.blank-field-label {
  color: #59606b;
  font-size: 0.88rem;
  letter-spacing: 0.06em;
}

.blank-field-state {
  font-size: 0.82rem;
  font-weight: 600;
}

.blank-field-state.is-correct {
  color: var(--right);
}

.blank-field-state.is-wrong {
  color: var(--brand);
}

.blank-input {
  width: 100%;
  min-height: 56px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcfe;
  color: var(--text);
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    background-color 180ms ease;
}

.blank-input:focus {
  outline: none;
  box-shadow: inset 0 0 0 2px rgba(35, 93, 137, 0.2);
  background: #fff;
}

.blank-answer-hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.unsupported-block {
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  background: #faf8f4;
}

.unsupported-title {
  margin: 0;
  font-weight: 600;
}

.unsupported-text {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.analysis-block {
  margin-top: 16px;
  padding: 16px 16px 14px;
  border-left: 3px solid #47b17d;
  background: #fcfbf8;
  border-radius: 0 12px 12px 0;
}

.answer-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 8px;
}

.answer-label,
.analysis-text {
  color: var(--muted);
}

.analysis-text {
  margin: 10px 0 0;
  line-height: 1.75;
  white-space: pre-line;
}

.records-header h2 {
  margin: 0;
  font-size: 1.08rem;
}

.records-header p,
.records-empty,
.record-meta,
.record-head span {
  color: var(--muted);
}

.records-header p {
  margin: 6px 0 0;
}

.records-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.record-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
}

.record-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.record-meta {
  margin: 8px 0 0;
  font-size: 0.9rem;
}

.login-page {
  min-height: calc(100vh - 120px);
  display: grid;
  place-items: center;
}

.login-card {
  width: min(460px, 100%);
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow);
}

.login-title {
  margin: 10px 0 8px;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 2rem;
}

.login-subtitle {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.login-form {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.login-form input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
}

.login-actions {
  display: flex;
  justify-content: flex-start;
}

.question-content {
  margin-top: 16px;
}

.question-content img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
}

.question-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  line-height: 1.6;
}

.question-content th,
.question-content td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
}

.question-content th {
  background: var(--soft);
  font-weight: 600;
}

.question-content tr:nth-child(even) td {
  background: #fafafa;
}

@media (max-width: 720px) {
  .result-summary,
  .toolbar,
  .toolbar-actions,
  .toolbar-stats,
  .hero-topline,
  .hero-actions,
  .record-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .question-card,
  .records-panel {
    padding: 18px;
  }

  .question-title {
    font-size: 1.2rem;
    margin-top: 2px;
  }

  .result-actions {
    width: 100%;
  }

  .option label {
    gap: 14px;
    padding: 16px 18px;
  }

  .option label::before {
    width: 36px;
    height: 36px;
  }

  .blank-field {
    padding: 16px;
  }
}

/* Records page */
.tab-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}

.tab-button {
  padding: 10px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--muted);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 180ms ease;
}

.tab-button.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.wrong-list {
  display: grid;
  gap: 14px;
}

.wrong-card {
  padding: 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow);
}

.wrong-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.wrong-index {
  color: #7e807f;
  font-size: 0.92rem;
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.wrong-tag {
  margin: 0;
  padding: 4px 10px;
  border-radius: 999px;
  background: #f2f3f5;
  color: #686f7a;
  font-size: 0.78rem;
}

.wrong-title {
  margin: 0 0 14px;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 1.2rem;
  line-height: 1.6;
  font-weight: 500;
}

.wrong-answers {
  display: grid;
  gap: 8px;
  margin-bottom: 10px;
}

.wrong-answer-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.95rem;
}

.wrong-answer-row.is-wrong {
  background: rgba(177, 61, 61, 0.07);
  border: 1px solid rgba(177, 61, 61, 0.15);
}

.wrong-answer-row.is-correct {
  background: rgba(44, 122, 84, 0.07);
  border: 1px solid rgba(44, 122, 84, 0.15);
}

.wrong-answer-label {
  color: var(--muted);
  font-size: 0.85rem;
  min-width: 72px;
}

.wrong-answer-row strong {
  font-weight: 600;
}

.wrong-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.load-more {
  display: block;
  width: 100%;
  margin-top: 14px;
  padding: 10px;
  text-align: center;
}

.wrong-options {
  display: grid;
  gap: 8px;
  margin: 14px 0;
}

.wrong-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  font-size: 0.95rem;
}

.wrong-option.is-correct {
  border-color: rgba(44, 122, 84, 0.32);
  background: rgba(44, 122, 84, 0.07);
}

.wrong-option.is-wrong {
  border-color: rgba(177, 61, 61, 0.28);
  background: rgba(177, 61, 61, 0.05);
}

.wrong-option-label {
  width: 32px;
  height: 32px;
  flex: none;
  display: grid;
  place-items: center;
  border: 1.5px solid rgba(69, 77, 89, 0.18);
  border-radius: 50%;
  color: #5d6470;
  background: #fff;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 0.9rem;
}

.wrong-option.is-correct .wrong-option-label {
  border-color: var(--right);
  background: var(--right);
  color: #fff;
}

.wrong-option.is-wrong .wrong-option-label {
  border-color: var(--wrong);
  background: var(--wrong);
  color: #fff;
}

.wrong-option-text {
  flex: 1;
}

.wrong-result-badge {
  margin-left: auto;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.badge-correct {
  background: var(--right);
  color: #fff;
}

.badge-wrong {
  background: var(--wrong);
  color: #fff;
}

.wrong-card.is-correct-card {
  border-color: rgba(44, 122, 84, 0.2);
}

.explanation-block {
  margin: 14px 0;
  padding: 14px 16px;
  border-left: 3px solid var(--brand);
  background: #f8f9fb;
  border-radius: 0 10px 10px 0;
}

.explanation-label {
  margin: 0 0 8px;
  color: var(--brand);
  font-size: 0.85rem;
  font-weight: 600;
}

.content-paragraph {
  margin: 10px 0 0;
  line-height: 1.7;
  color: var(--text);
  font-size: 0.95rem;
}

.pagination-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.page-btn {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 180ms ease;
}

.page-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--soft);
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-numbers {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.page-number {
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 180ms ease;
}

.page-number:hover:not(.is-current) {
  border-color: var(--accent);
  background: var(--soft);
}

.page-number.is-current {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  cursor: default;
}

.page-ellipsis {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0 4px;
}

.favorite-btn {
  position: absolute;
  top: 22px;
  right: 26px;
  padding: 4px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: #b0b3b8;
  transition: color 180ms ease, transform 180ms ease;
  display: grid;
  place-items: center;
  z-index: 2;
}

.favorite-btn:hover:not(.is-disabled) {
  color: #e05a5a;
  transform: scale(1.15);
}

.favorite-btn.is-favorited {
  color: #e05a5a;
}

.favorite-btn.is-favorited .favorite-icon {
  fill: currentColor;
}

.favorite-btn.is-disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.favorite-icon {
  width: 22px;
  height: 22px;
  display: block;
}