:root {
  color-scheme: light;
  --bg: #f5f6f1;
  --surface: #ffffff;
  --surface-muted: #f0f4f3;
  --text: #1e2426;
  --muted: #667174;
  --line: #d9dfdd;
  --green: #246b5c;
  --green-strong: #165143;
  --gold: #b57b22;
  --red: #b73b3b;
  --blue: #315f9c;
  --shadow: 0 18px 42px rgba(20, 28, 31, 0.1);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #151817;
  --surface: #202625;
  --surface-muted: #2a3230;
  --text: #e8eeeb;
  --muted: #a8b3b0;
  --line: #3a4642;
  --green: #3da184;
  --green-strong: #7fd7bd;
  --gold: #d1a14a;
  --red: #ef7777;
  --blue: #8bb7f0;
  --shadow: 0 18px 42px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    system-ui,
    sans-serif;
}

button,
select,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 36px;
}

.topbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}

.bank-gate {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
  gap: 24px;
  align-items: end;
  margin-bottom: 18px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.bank-loader {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
  align-items: end;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.12;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, minmax(86px, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.scoreboard div {
  min-width: 0;
  padding: 12px 16px;
  border-left: 1px solid var(--line);
}

.scoreboard div:first-child {
  border-left: 0;
}

.scoreboard span {
  display: block;
  color: var(--green-strong);
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
}

.scoreboard small {
  color: var(--muted);
}

.top-actions {
  display: flex;
  align-items: stretch;
  gap: 10px;
}

.compact-button {
  min-height: 42px;
  padding: 0 14px;
  border-radius: 8px;
  white-space: nowrap;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: end;
  margin-bottom: 16px;
}

.toolbar > label {
  flex: 1 1 120px;
}

.toolbar > .review-filter-field {
  flex-basis: 150px;
}

.toolbar > .knowledge-field {
  flex: 2 1 180px;
}

.toolbar > .mode-field {
  flex: 0 0 168px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.field-group {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.field-label {
  min-height: 16px;
}

select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 0 12px;
  outline: none;
}

select:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(36, 107, 92, 0.16);
}

select:disabled {
  cursor: not-allowed;
  background: var(--surface-muted);
  color: #8a9290;
}

input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 0 12px;
  outline: none;
}

input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(36, 107, 92, 0.16);
}

.toggle-row {
  display: grid;
  grid-template-columns: repeat(2, 74px);
  min-height: 42px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.mode-field .toggle-row {
  width: 100%;
  grid-template-columns: repeat(2, minmax(78px, 1fr));
  font-size: 16px;
}

.bank-toggle {
  flex: 0 0 auto;
  width: max-content;
  grid-template-columns: max-content max-content;
}

.bank-toggle .mode-button {
  min-width: 78px;
}

.mode-button {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  min-width: 0;
  padding: 0 12px;
  text-align: center;
  white-space: nowrap;
}

.mode-button:first-child {
  border-left: 0;
}

.mode-button.is-active {
  background: var(--green);
  color: #fff;
}

.content-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
}

.side-panel,
.quiz-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.side-panel {
  align-self: start;
  padding: 18px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-head span {
  color: var(--green);
  font-weight: 800;
}

.breakdown {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
  color: var(--muted);
}

.breakdown-row strong {
  color: var(--text);
}

.progress-wrap {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 13px;
}

.progress-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-muted);
  cursor: grab;
  touch-action: none;
}

.progress-track:active {
  cursor: grabbing;
}

.progress-bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--gold));
  transition: width 180ms ease;
}

.ghost-button,
.secondary-button,
.primary-button {
  min-height: 42px;
  border-radius: 8px;
  padding: 0 16px;
  font-weight: 800;
}

.ghost-button {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface-muted);
  color: var(--text);
}

.progress-wrap .return-button {
  min-height: 36px;
  margin-top: 2px;
  padding: 0 12px;
  font-size: 16px;
}

.archive-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

.archive-actions .ghost-button {
  padding: 0 10px;
}

.redo-all-button {
  margin-top: 10px;
  border-color: rgba(183, 59, 59, 0.28);
  color: var(--red);
}

.save-panel,
.search-panel {
  display: grid;
  gap: 10px;
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.save-head,
.search-head {
  margin-bottom: 0;
}

.save-box,
.search-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 64px;
  gap: 8px;
}

.save-box .ghost-button,
.search-box .ghost-button {
  padding: 0 10px;
}

.save-panel > .ghost-button {
  padding: 0 12px;
}

.search-results {
  display: grid;
  gap: 8px;
  max-height: 340px;
  overflow: auto;
  padding-right: 2px;
}

.search-result {
  display: grid;
  gap: 5px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-muted);
  color: var(--text);
  padding: 10px;
  text-align: left;
}

.search-result:hover {
  border-color: rgba(36, 107, 92, 0.55);
}

.search-result span,
.search-result small,
.search-empty {
  color: var(--muted);
  font-size: 12px;
}

.search-result strong {
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.search-empty {
  margin: 0;
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}

.quiz-card {
  min-height: 520px;
  padding: clamp(20px, 4vw, 34px);
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.question-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-muted);
  padding: 5px 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.question-meta .trace-badge {
  border-color: rgba(181, 123, 34, 0.4);
  background: #fff6e6;
  color: #7a5319;
}

.question-meta .trace-correct {
  border-color: rgba(36, 107, 92, 0.42);
  background: #e7f5ef;
  color: var(--green-strong);
}

.question-meta .trace-wrong {
  border-color: rgba(183, 59, 59, 0.42);
  background: #fff0f0;
  color: var(--red);
}

.question-meta .trace-redo {
  border-color: rgba(49, 95, 156, 0.42);
  background: #edf4ff;
  color: var(--blue);
}

.question-meta .trace-marked {
  border-color: rgba(181, 123, 34, 0.45);
  background: #fff6e6;
  color: #7a5319;
}

.knowledge {
  margin-bottom: 10px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
}

#questionStem {
  margin-bottom: 22px;
  font-size: clamp(20px, 2.3vw, 28px);
  line-height: 1.55;
}

.options {
  display: grid;
  gap: 12px;
}

.option {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 14px;
  color: var(--text);
  text-align: left;
}

.option:hover {
  border-color: rgba(36, 107, 92, 0.55);
}

.option.is-selected {
  border-color: var(--green);
  background: #edf6f2;
}

.option.is-correct {
  border-color: var(--green);
  background: #e7f5ef;
}

.option.is-wrong {
  border-color: var(--red);
  background: #fff0f0;
}

.option-key {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--surface-muted);
  color: var(--green-strong);
  font-weight: 900;
}

.option-text {
  min-width: 0;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.answer-panel {
  display: grid;
  gap: 12px;
  margin-top: 20px;
  border-left: 4px solid var(--green);
  border-radius: 8px;
  background: var(--surface-muted);
  padding: 14px 16px;
}

.answer-panel.is-wrong {
  border-left-color: var(--red);
}

.answer-panel p {
  margin-bottom: 0;
  line-height: 1.6;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  background: rgba(14, 18, 17, 0.52);
  padding: 22px;
}

.modal-panel {
  width: min(880px, 100%);
  max-height: min(760px, calc(100vh - 44px));
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 24px 68px rgba(0, 0, 0, 0.28);
  padding: clamp(20px, 4vw, 30px);
}

.modal-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  margin-bottom: 14px;
}

.modal-head h2 {
  margin-bottom: 0;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.5;
}

.modal-trace {
  display: inline-flex;
  margin-bottom: 12px;
  border: 1px solid rgba(181, 123, 34, 0.4);
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--muted);
  padding: 5px 10px;
  font-size: 13px;
  font-weight: 800;
}

.modal-options {
  display: grid;
  gap: 10px;
}

.modal-option {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-muted);
  padding: 12px;
}

.modal-option.is-correct {
  border-color: var(--green);
  background: #e7f5ef;
}

.modal-answer {
  margin-top: 18px;
}

.answer-status {
  font-size: 18px;
  font-weight: 900;
}

.answer-status.correct {
  color: var(--green-strong);
}

.answer-status.wrong {
  color: var(--red);
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1.3fr 1fr;
  gap: 12px;
  margin-top: 24px;
}

.actions.has-redo {
  grid-template-columns: 1fr 1fr 1fr 1.3fr 1fr;
}

.primary-button {
  border: 1px solid var(--green);
  background: var(--green);
  color: #fff;
}

.secondary-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
}

.redo-button {
  border-color: rgba(183, 59, 59, 0.36);
  background: #fff0f0;
  color: var(--red);
}

.mark-button {
  border-color: rgba(181, 123, 34, 0.36);
  background: #fffaf0;
  color: #7a5319;
}

.mark-button.is-marked {
  background: #fff0cb;
}

:root[data-theme="dark"] .option {
  background: var(--surface);
}

:root[data-theme="dark"] .option.is-selected {
  background: #203a33;
}

:root[data-theme="dark"] .option.is-correct {
  background: #1d3a31;
}

:root[data-theme="dark"] .modal-option.is-correct {
  background: #1d3a31;
}

:root[data-theme="dark"] .option.is-wrong,
:root[data-theme="dark"] .redo-button {
  background: #3a2426;
}

:root[data-theme="dark"] .mark-button,
:root[data-theme="dark"] .mark-button.is-marked,
:root[data-theme="dark"] .question-meta .trace-badge,
:root[data-theme="dark"] .question-meta .trace-marked {
  background: #3a3020;
  color: #e1b75f;
}

:root[data-theme="dark"] .question-meta .trace-correct {
  background: #1d3a31;
}

:root[data-theme="dark"] .question-meta .trace-wrong {
  background: #3a2426;
}

:root[data-theme="dark"] .question-meta .trace-redo {
  background: #23334a;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.empty-state {
  display: grid;
  min-height: 420px;
  place-content: center;
  text-align: center;
}

.empty-state h2 {
  margin-bottom: 8px;
}

.empty-state p {
  color: var(--muted);
}

@media (max-width: 860px) {
  .app-shell {
    width: min(100% - 20px, 720px);
    padding-top: 18px;
  }

  .bank-gate,
  .topbar,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    display: grid;
    align-items: start;
  }

  .top-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .bank-toggle {
    flex: 1 1 100%;
    min-width: 0;
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .knowledge-field,
  .review-filter-field,
  .mode-field,
  .toggle-row {
    flex: 1 1 calc(50% - 6px);
  }
}

@media (max-width: 560px) {
  .scoreboard {
    grid-template-columns: repeat(3, 1fr);
  }

  .scoreboard div {
    padding: 10px;
  }

  .bank-loader,
  .save-box,
  .search-box,
  .actions {
    grid-template-columns: 1fr;
  }

  .toolbar > label,
  .toolbar > .review-filter-field,
  .toolbar > .knowledge-field,
  .toolbar > .mode-field,
  .toolbar > .toggle-row {
    flex: 1 1 100%;
  }

  .quiz-card {
    min-height: auto;
  }
}