:root {
  --red: #e4311b;
  --red-dark: #8f1d13;
  --red-deep: #4b130f;
  --gold: #f6ad2e;
  --cream: #fff8ee;
  --paper: #fffdf9;
  --ink: #261c1a;
  --muted: #6e5d59;
  --line: #efd9ce;
  --success: #26734d;
  --success-bg: #edf8f1;
  --error: #a12718;
  --error-bg: #fff1ed;
  --focus: #261c1a;
  --radius: 8px;
  --content-width: 880px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 12px;
  padding: 10px 14px;
  transform: translateY(-160%);
  background: #ffffff;
  color: var(--red-dark);
  border: 2px solid var(--red);
  border-radius: 4px;
  font-weight: 800;
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.quiz-header {
  background: #ffffff;
  border-top: 4px solid var(--red);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(calc(100% - 40px), 1120px);
  min-height: 72px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
}

.brand img {
  display: block;
  width: 118px;
  height: auto;
}

.back-link {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  padding: 6px 2px;
  color: var(--red-dark);
  font-weight: 800;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.back-link::before {
  content: "←";
  margin-right: 8px;
  color: var(--red);
}

.quiz-main {
  width: min(calc(100% - 40px), var(--content-width));
  margin-inline: auto;
  flex: 1;
}

.view {
  padding: 64px 0 72px;
}

.app-notice {
  margin: 24px 0 0;
  padding: 12px 16px;
  color: var(--red-deep);
  background: var(--cream);
  border-left: 4px solid var(--gold);
}

.section-label,
.question-number {
  margin: 0 0 10px;
  color: var(--red-dark);
  font-size: 0.92rem;
  font-weight: 900;
}

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

h1,
h2 {
  color: var(--red-deep);
  text-wrap: balance;
}

h1 {
  margin-bottom: 18px;
  font-size: 2.75rem;
  line-height: 1.25;
}

h2 {
  margin-bottom: 18px;
  font-size: 1.5rem;
  line-height: 1.35;
}

.home-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 152px;
  align-items: end;
  gap: 44px;
  padding-bottom: 40px;
  border-bottom: 4px solid var(--red-deep);
}

.intro-copy {
  max-width: 640px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.question-count {
  min-height: 132px;
  padding-left: 26px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid var(--line);
  color: var(--red-dark);
}

.question-count strong {
  font-size: 4.25rem;
  line-height: 1;
}

.question-count span {
  margin-top: 8px;
  font-weight: 800;
}

.test-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.test-facts div {
  padding: 22px 18px;
  border-right: 1px solid var(--line);
}

.test-facts div:first-child {
  padding-left: 0;
}

.test-facts div:last-child {
  border-right: 0;
}

.test-facts dt {
  color: var(--muted);
  font-size: 0.88rem;
}

.test-facts dd {
  margin: 2px 0 0;
  color: var(--red-deep);
  font-weight: 900;
}

.home-content {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(240px, 0.75fr);
  gap: 64px;
  padding-top: 42px;
}

.rules ol {
  padding-left: 1.5rem;
  margin: 0;
}

.rules li {
  padding-left: 8px;
  margin-bottom: 12px;
}

.rules li::marker {
  color: var(--red);
  font-weight: 900;
}

.start-area {
  padding-left: 28px;
  border-left: 4px solid var(--gold);
}

.start-area p {
  color: var(--muted);
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  border: 2px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 900;
  line-height: 1.35;
  text-align: center;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.button-primary {
  background: var(--red-dark);
  color: #ffffff;
  border-color: var(--red-dark);
}

.button-primary:hover {
  background: var(--red-deep);
  border-color: var(--red-deep);
}

.button-secondary {
  background: #ffffff;
  color: var(--red-dark);
  border-color: var(--red-dark);
}

.button-secondary:hover {
  background: var(--cream);
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.question-header {
  display: grid;
  grid-template-columns: auto minmax(160px, 1fr) auto;
  align-items: center;
  gap: 20px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.progress-copy {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.progress-copy span {
  color: var(--muted);
  font-size: 0.9rem;
}

.progress-copy strong {
  color: var(--red-deep);
  white-space: nowrap;
}

progress {
  width: 100%;
  height: 10px;
  overflow: hidden;
  appearance: none;
  border: 0;
  border-radius: 4px;
  background: var(--line);
}

progress::-webkit-progress-bar {
  background: var(--line);
}

progress::-webkit-progress-value {
  background: var(--red);
}

progress::-moz-progress-bar {
  background: var(--red);
}

.module-label {
  margin: 0;
  padding: 5px 10px;
  border: 1px solid var(--gold);
  border-radius: 4px;
  color: var(--red-dark);
  background: var(--cream);
  font-size: 0.88rem;
  font-weight: 900;
  white-space: nowrap;
}

.question-block {
  padding: 48px 0 28px;
}

.question-block h1 {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 2rem;
}

fieldset {
  min-width: 0;
  padding: 0;
  margin: 0;
  border: 0;
}

.option-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.option {
  position: relative;
  min-height: 56px;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  background: #ffffff;
  border: 2px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.option:hover {
  border-color: var(--gold);
}

.option:has(input:checked) {
  background: var(--cream);
  border-color: var(--red);
}

.option input {
  width: 20px;
  height: 20px;
  margin: 0;
  accent-color: var(--red);
}

.option.is-correct {
  color: var(--success);
  background: var(--success-bg);
  border-color: var(--success);
}

.option.is-correct::after {
  content: "✓ 正确答案";
  grid-column: 2;
  color: var(--success);
  font-size: 0.85rem;
  font-weight: 900;
}

.option.is-incorrect {
  color: var(--error);
  background: var(--error-bg);
  border-color: var(--error);
}

.option.is-incorrect::after {
  content: "× 你的答案";
  grid-column: 2;
  color: var(--error);
  font-size: 0.85rem;
  font-weight: 900;
}

.feedback {
  min-height: 72px;
  margin-top: 22px;
  padding: 14px 16px;
  border-left: 4px solid transparent;
}

.feedback:empty {
  padding-block: 0;
}

.feedback.is-correct {
  color: var(--success);
  background: var(--success-bg);
  border-color: var(--success);
}

.feedback.is-correct::before {
  content: "✓ 正确：";
  font-weight: 900;
}

.feedback.is-incorrect {
  color: var(--error);
  background: var(--error-bg);
  border-color: var(--error);
}

.feedback.is-incorrect::before {
  content: "× 再想一想：";
  font-weight: 900;
}

.quiz-actions {
  min-height: 80px;
  margin-top: 28px;
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  border-top: 1px solid var(--line);
}

.quiz-actions .button {
  min-width: 132px;
}

.result-heading {
  padding-bottom: 28px;
  border-bottom: 4px solid var(--red-deep);
}

.result-heading h1 {
  margin-bottom: 0;
}

.result-summary {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  align-items: center;
  gap: 36px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.score {
  margin: 0;
  color: var(--red);
}

.score strong {
  font-size: 5rem;
  line-height: 1;
}

.score span {
  margin-left: 6px;
  color: var(--red-dark);
  font-weight: 900;
}

.result-summary dl {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
}

.result-summary dl div {
  padding: 8px 20px;
  border-left: 1px solid var(--line);
}

.result-summary dt {
  color: var(--muted);
  font-size: 0.9rem;
}

.result-summary dd {
  margin: 4px 0 0;
  color: var(--red-deep);
  font-size: 1.25rem;
  font-weight: 900;
}

.result-section {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.module-stats {
  display: grid;
  gap: 12px;
}

.module-stat {
  display: grid;
  grid-template-columns: minmax(110px, 1fr) minmax(120px, 2fr) auto;
  align-items: center;
  gap: 16px;
}

.incorrect-list {
  padding-left: 1.5rem;
  margin-bottom: 0;
}

.incorrect-list li {
  padding: 14px 0 14px 8px;
  border-bottom: 1px solid var(--line);
}

.incorrect-list li:last-child {
  border-bottom: 0;
}

.incorrect-list p {
  margin: 6px 0 0;
  color: var(--muted);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 34px;
}

.maintenance-view {
  max-width: 640px;
}

.maintenance-view > p:not(.section-label) {
  color: var(--muted);
  font-size: 1.05rem;
}

.noscript-message {
  margin: 24px 0;
  padding: 18px 20px;
  color: var(--red-deep);
  background: var(--cream);
  border-left: 4px solid var(--red);
}

.noscript-message p {
  margin: 4px 0 0;
}

.quiz-footer {
  padding: 20px;
  color: var(--muted);
  background: var(--cream);
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 0.85rem;
}

.quiz-footer p {
  margin: 0;
}

/* The active quiz is a compact work surface; home and results remain document pages. */
body[data-view="quiz"] .quiz-footer {
  display: none;
}

body[data-view="quiz"] .header-inner {
  min-height: 56px;
}

body[data-view="quiz"] .brand img {
  width: 98px;
}

body[data-view="quiz"] .quiz-main {
  width: min(calc(100% - 32px), 1100px);
  min-height: 0;
}

.quiz-view {
  padding: 14px 0 12px;
}

body[data-view="quiz"] .quiz-view {
  height: 100%;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
}

body[data-view="quiz"] .question-header {
  gap: 14px;
  padding-bottom: 10px;
}

body[data-view="quiz"] #question-form {
  min-height: 0;
  display: grid;
  grid-template-rows: auto auto minmax(44px, auto) 57px;
  align-content: center;
}

body[data-view="quiz"] .question-block {
  padding: 12px 0 10px;
}

body[data-view="quiz"] .question-number {
  margin-bottom: 4px;
  font-size: 0.82rem;
}

body[data-view="quiz"] .question-block h1 {
  max-width: 920px;
  font-size: 1.55rem;
  line-height: 1.32;
}

body[data-view="quiz"] .option-list {
  gap: 7px;
}

body[data-view="quiz"] .option {
  min-height: 48px;
  gap: 10px;
  padding: 7px 14px;
  line-height: 1.35;
}

body[data-view="quiz"] .option.is-correct::after,
body[data-view="quiz"] .option.is-incorrect::after {
  font-size: 0.76rem;
  line-height: 1.2;
}

body[data-view="quiz"] .feedback {
  min-height: 44px;
  margin-top: 7px;
  padding: 8px 12px;
  align-self: end;
  font-size: 0.9rem;
  line-height: 1.45;
}

body[data-view="quiz"] .feedback:empty {
  padding-block: 0;
}

body[data-view="quiz"] .quiz-actions {
  min-height: 0;
  height: 57px;
  margin-top: 0;
  padding-top: 8px;
  align-items: end;
}

body[data-view="quiz"] .quiz-actions .button {
  min-width: 124px;
  min-height: 48px;
  padding-block: 7px;
}

@media (min-height: 568px) {
  body[data-view="quiz"] {
    height: 100svh;
    min-height: 0;
    overflow: hidden;
  }

  body[data-view="quiz"] .quiz-main {
    flex: 1;
    height: 0;
  }
}

@media (max-width: 700px) {
  h1 {
    font-size: 2.2rem;
  }

  .home-intro {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .question-count {
    min-height: 0;
    padding: 20px 0 0;
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    gap: 10px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .question-count strong {
    font-size: 3rem;
  }

  .home-content {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .start-area {
    padding-left: 20px;
  }

  .question-header {
    grid-template-columns: 1fr auto;
  }

  .question-header progress {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  body[data-view="quiz"] .question-header {
    grid-template-columns: auto minmax(80px, 1fr) auto;
  }

  body[data-view="quiz"] .question-header progress {
    grid-column: 2;
    grid-row: 1;
  }

  .result-summary {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .result-summary dl div:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 480px) {
  .header-inner,
  .quiz-main {
    width: calc(100% - 24px);
  }

  .header-inner {
    min-height: 64px;
  }

  .brand img {
    width: 102px;
  }

  .back-link {
    font-size: 0.9rem;
  }

  .view {
    padding: 42px 0 54px;
  }

  h1 {
    font-size: 1.9rem;
  }

  .home-intro {
    padding-bottom: 28px;
  }

  .test-facts {
    grid-template-columns: 1fr;
  }

  .test-facts div,
  .test-facts div:first-child {
    padding: 14px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .test-facts div:last-child {
    border-bottom: 0;
  }

  .start-area .button,
  .result-actions .button {
    width: 100%;
  }

  .question-header {
    gap: 10px;
  }

  .progress-copy {
    display: grid;
    gap: 0;
  }

  .question-block {
    padding-top: 36px;
  }

  .question-block h1 {
    font-size: 1.55rem;
  }

  .option {
    grid-template-columns: 22px minmax(0, 1fr);
    padding-inline: 12px;
  }

  .quiz-actions {
    min-height: 132px;
    display: grid;
    grid-template-columns: 1fr;
  }

  .quiz-actions .button {
    width: 100%;
  }

  .result-summary dl {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .result-summary dl div,
  .result-summary dl div:first-child {
    padding: 0 0 12px;
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }

  .result-summary dl div:last-child {
    border-bottom: 0;
  }

  .module-stat {
    grid-template-columns: 1fr auto;
  }

  .module-stat progress {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  body[data-view="quiz"] .header-inner {
    min-height: 52px;
  }

  body[data-view="quiz"] .brand img {
    width: 86px;
  }

  body[data-view="quiz"] .back-link {
    font-size: 0.82rem;
  }

  body[data-view="quiz"] .quiz-main {
    width: calc(100% - 20px);
  }

  body[data-view="quiz"] .quiz-view {
    padding: 7px 0 6px;
  }

  body[data-view="quiz"] .question-header {
    gap: 7px;
    padding-bottom: 6px;
  }

  body[data-view="quiz"] .progress-copy {
    display: flex;
    gap: 5px;
  }

  body[data-view="quiz"] .progress-copy > span {
    display: none;
  }

  body[data-view="quiz"] .module-label {
    padding: 3px 7px;
    font-size: 0.75rem;
  }

  body[data-view="quiz"] #question-form {
    grid-template-rows: auto auto minmax(42px, auto) 53px;
  }

  body[data-view="quiz"] .question-block {
    padding: 7px 0 6px;
  }

  body[data-view="quiz"] .question-number {
    margin-bottom: 2px;
    font-size: 0.76rem;
  }

  body[data-view="quiz"] .question-block h1 {
    font-size: 1.28rem;
    line-height: 1.28;
  }

  body[data-view="quiz"].has-long-question .question-block h1 {
    font-size: 1.08rem;
    line-height: 1.25;
  }

  body[data-view="quiz"] .option-list {
    gap: 5px;
  }

  body[data-view="quiz"] .option {
    grid-template-columns: 20px minmax(0, 1fr);
    min-height: 48px;
    gap: 8px;
    padding: 5px 10px;
    font-size: 0.92rem;
    line-height: 1.25;
  }

  body[data-view="quiz"] .option input {
    width: 18px;
    height: 18px;
  }

  body[data-view="quiz"] .option.is-correct::after,
  body[data-view="quiz"] .option.is-incorrect::after {
    position: absolute;
    right: 8px;
    bottom: 2px;
  }

  body[data-view="quiz"] .feedback {
    min-height: 42px;
    margin-top: 5px;
    padding: 6px 9px;
    font-size: 0.8rem;
    line-height: 1.35;
  }

  body[data-view="quiz"] .quiz-actions {
    height: 53px;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding-top: 5px;
  }

  body[data-view="quiz"] .quiz-actions .button {
    min-width: 0;
    min-height: 48px;
    padding: 6px 10px;
    font-size: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}