:root {
  --text: #111111;
  --border: #d8d8d8;
  --muted: #555555;
  --correct: #1f7a1f;
  --incorrect: #9b1c1c;
  --warning-bg: #fff4f4;
  --warning-border: #d88f8f;
  --review-correct-bg: #eef9ee;
  --review-incorrect-bg: #fff1f1;
  --bronze: #8a5a24;
  --bronze-bg: #fff7ee;
  --silver: #58616b;
  --silver-bg: #f4f6f8;
  --gold: #9b7700;
  --gold-bg: #fff9e7;
  --mixed: #1c5f7a;
  --mixed-bg: #eef8fc;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #ffffff;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

h1,
h2,
h3 {
  margin: 0 0 12px;
  font-weight: 600;
}

.validation {
  margin-bottom: 16px;
  padding: 12px;
  border: 1px solid var(--warning-border);
  background: var(--warning-bg);
}

.difficulty-selector,
.quiz-toolbar {
  margin-bottom: 16px;
}

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

.difficulty-actions button[data-difficulty="bronze"] {
  border-color: var(--bronze);
  color: var(--bronze);
  background: var(--bronze-bg);
}

.difficulty-actions button[data-difficulty="silver"] {
  border-color: var(--silver);
  color: var(--silver);
  background: var(--silver-bg);
}

.difficulty-actions button[data-difficulty="gold"] {
  border-color: var(--gold);
  color: var(--gold);
  background: var(--gold-bg);
}

.difficulty-actions button[data-difficulty="mixed"] {
  border-color: var(--mixed);
  color: var(--mixed);
  background: var(--mixed-bg);
}

.quiz-toolbar p {
  margin: 0;
}

#quizContainer,
#reviewContainer {
  display: grid;
  gap: 14px;
}

.question-card,
.review-card {
  border: 1px solid var(--border);
  padding: 14px;
  background: #ffffff;
}

.review-card.correct-bg {
  background: var(--review-correct-bg);
  border-color: #9fcb9f;
}

.review-card.incorrect-bg {
  background: var(--review-incorrect-bg);
  border-color: #e2a9a9;
}

.question-card.missing {
  border-color: var(--warning-border);
}

.question-label {
  margin: 0 0 10px;
  font-weight: 600;
}

.question-prompt {
  margin: 0 0 10px;
  white-space: pre-wrap;
}

.inline-code {
  display: inline-block;
  padding: 1px 5px;
  border: 1px solid var(--border);
  background: #fafafa;
  font-family: "Courier New", Courier, monospace;
  font-size: 0.95em;
}

.code-block {
  margin: 0 0 10px;
  padding: 10px;
  border: 1px solid var(--border);
  background: #fafafa;
  overflow-x: auto;
  font-family: "Courier New", Courier, monospace;
  font-size: 0.95rem;
}

.options {
  display: grid;
  gap: 8px;
  margin-bottom: 4px;
}

.option-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.option-body {
  display: grid;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

.option-label {
  font-weight: 600;
}

.option-row span {
  white-space: pre-wrap;
}

.option-code,
.answer-code {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--border);
  background: #fafafa;
  overflow-x: auto;
}

.option-code code,
.answer-code code {
  white-space: pre;
}

.option-inline-code {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid var(--border);
  background: #fafafa;
  white-space: pre-wrap;
}

input[type="text"],
textarea {
  width: 100%;
  border: 1px solid var(--border);
  padding: 8px;
  font: inherit;
  color: inherit;
  background: #ffffff;
}

textarea {
  min-height: 84px;
  resize: vertical;
}

.actions {
  margin-top: 16px;
}

.score-line {
  margin: 0 0 10px;
  font-size: 2rem;
  font-weight: 700;
}

button {
  border: 1px solid #111111;
  background: #ffffff;
  color: #111111;
  font: inherit;
  padding: 8px 12px;
  cursor: pointer;
}

button:hover {
  background: #f7f7f7;
}

.status {
  margin: 10px 0;
  font-weight: 600;
}

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

.status.incorrect {
  color: var(--incorrect);
}

.review-meta {
  margin: 6px 0;
}

.review-answer {
  margin: 6px 0;
  white-space: pre-wrap;
}

.answer-label {
  margin: 6px 0 4px;
}

.answer-block {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--border);
  background: #fafafa;
  white-space: pre-wrap;
  font: inherit;
}

.manual-mark {
  margin-top: 10px;
}

@media (max-width: 640px) {
  .page {
    padding: 16px 12px 28px;
  }

  .question-card,
  .review-card {
    padding: 12px;
  }
}