:root {
  --ym-bg: #fdfaf3;
  --ym-surface: #ffffff;
  --ym-text: #3e2f23;
  --ym-heading: #4a3728;
  --ym-muted: #6f6258;
  --ym-green: #257836;
  --ym-green-soft: #f1f7ed;
  --ym-terracotta: #9c5230;
  --ym-border: #e8ddc9;
  --ym-hint: #f6efe0;
  --ym-correct: #1d5e2a;
  --ym-retry: #9c5230;
  --ym-radius: 16px;
}

* {
  box-sizing: border-box;
}

/* display を指定した要素にも hidden 属性を効かせる */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--ym-bg);
  color: var(--ym-text);
  font-family: "Hiragino Maru Gothic ProN", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  line-height: 1.9;
  -webkit-text-size-adjust: 100%;
}

.app-shell {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0 16px;
}

.app-header h1 {
  margin: 0;
  font-size: 1.6rem;
  color: var(--ym-heading);
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  color: var(--ym-muted);
  letter-spacing: 0.04em;
}

button {
  font-family: inherit;
  font-size: 1rem;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 2px solid var(--ym-border);
  background: var(--ym-surface);
  color: var(--ym-text);
  cursor: pointer;
  line-height: 1.4;
}

button:hover:not(:disabled) {
  border-color: var(--ym-green);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button:focus-visible {
  outline: 3px solid var(--ym-terracotta);
  outline-offset: 2px;
}

.primary-button {
  background: var(--ym-green);
  border-color: var(--ym-green);
  color: #ffffff;
  font-weight: 700;
}

.secondary-button {
  background: var(--ym-green-soft);
  border-color: var(--ym-green);
  color: var(--ym-correct);
}

.wide-button {
  display: block;
  width: 100%;
  margin-top: 24px;
  font-size: 1.1rem;
  min-height: 56px;
}

.back-button {
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.screen {
  background: var(--ym-surface);
  border: 2px solid var(--ym-border);
  border-radius: var(--ym-radius);
  padding: 20px 18px 24px;
}

.screen h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
  color: var(--ym-heading);
}

.screen-lead {
  margin: 0 0 16px;
  color: var(--ym-muted);
}

/* むずかしさ */
.level-grid {
  display: grid;
  gap: 12px;
}

.level-card {
  display: block;
  width: 100%;
  text-align: left;
  border-radius: var(--ym-radius);
  padding: 16px 18px;
  min-height: 72px;
}

.level-card .level-name {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ym-heading);
}

.level-card .level-desc {
  display: block;
  font-size: 0.9rem;
  color: var(--ym-muted);
}

/* おはなし一覧 */
.story-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.story-list button {
  width: 100%;
  text-align: left;
  border-radius: var(--ym-radius);
  font-size: 1.15rem;
  padding: 14px 18px;
}

.empty-note {
  color: var(--ym-muted);
}

/* ほんぶん */
.story-tools,
.quiz-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.quiz-tools {
  margin-bottom: 0;
}

.story-body {
  font-size: 1.25rem;
  line-height: 2.3;
  background: #fffdf7;
  border: 2px dashed var(--ym-border);
  border-radius: var(--ym-radius);
  padding: 16px 18px;
}

.story-body p {
  margin: 0 0 14px;
}

.story-body p:last-child {
  margin-bottom: 0;
}

ruby rt {
  font-size: 0.5em;
  color: var(--ym-muted);
  letter-spacing: 0;
}

/* コマ */
.panel-grid {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  grid-template-columns: 1fr;
}

.panel-item {
  margin: 0;
  border: 2px solid var(--ym-border);
  border-radius: var(--ym-radius);
  overflow: hidden;
  background: #ffffff;
}

.panel-item img {
  display: block;
  width: 100%;
  height: auto;
}

.panel-item figcaption {
  padding: 6px 10px;
  font-size: 0.85rem;
  color: var(--ym-muted);
  background: var(--ym-hint);
}

@media (min-width: 620px) {
  .panel-grid {
    grid-template-columns: 1fr 1fr;
  }
  .level-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* もんだい */
.quiz-progress {
  margin: 0 0 4px;
  color: var(--ym-muted);
  font-size: 0.9rem;
}

.question-block {
  background: var(--ym-green-soft);
  border-radius: var(--ym-radius);
  padding: 16px 18px;
  margin-bottom: 16px;
}

.question-text {
  margin: 0 0 12px;
  font-size: 1.2rem;
  line-height: 2.1;
  white-space: pre-line;
}

.choice-list {
  display: grid;
  gap: 10px;
}

.choice-button {
  width: 100%;
  text-align: left;
  border-radius: var(--ym-radius);
  font-size: 1.1rem;
  padding: 14px 16px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.choice-mark {
  flex: 0 0 auto;
  width: 1.6em;
  font-weight: 700;
}

.choice-button.is-correct {
  border-color: var(--ym-correct);
  background: #eaf6ec;
  color: var(--ym-correct);
}

.choice-button.is-wrong {
  border-color: var(--ym-retry);
  background: #fbf0e9;
  color: var(--ym-retry);
}

.feedback {
  margin: 16px 0 0;
  font-size: 1.15rem;
  font-weight: 700;
  min-height: 1.9em;
}

.feedback.is-correct {
  color: var(--ym-correct);
}

.feedback.is-retry {
  color: var(--ym-retry);
}

.explanation {
  margin-top: 12px;
  background: var(--ym-hint);
  border-radius: var(--ym-radius);
  padding: 14px 16px;
  font-size: 1.05rem;
}

.explanation h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--ym-heading);
}

.explanation p {
  margin: 0 0 8px;
}

.explanation p:last-child {
  margin-bottom: 0;
}

.hint-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.hint-button {
  background: var(--ym-hint);
  border-color: #e0d0ac;
  font-size: 0.95rem;
}

.hint-button.is-used {
  background: #efe6d2;
  color: var(--ym-muted);
}

.hint-note {
  margin: 8px 0 0;
  font-size: 0.85rem;
  color: var(--ym-muted);
  min-height: 1.4em;
}

/* 設問画面につねに出ている本文。設問より控えめな字づかいで、紙のテストのように上に置く */
.reread-box {
  margin: 0 0 16px;
  background: #fffdf7;
  border: 2px dashed var(--ym-border);
  border-radius: var(--ym-radius);
  padding: 14px 16px;
  font-size: 1.1rem;
  line-height: 2.2;
}

.reread-box p {
  margin: 0 0 12px;
}

.reread-box p:last-child {
  margin-bottom: 0;
}

/* けっか */
.result-score {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ym-correct);
  margin: 4px 0;
}

.result-praise {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.result-hint {
  margin: 0;
  color: var(--ym-muted);
  font-size: 0.95rem;
}

.talk-box {
  margin-top: 20px;
  background: var(--ym-green-soft);
  border: 2px solid var(--ym-border);
  border-radius: var(--ym-radius);
  padding: 16px 18px;
}

.talk-box h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--ym-heading);
}

.talk-box p {
  margin: 0;
  font-size: 1.1rem;
  line-height: 2.1;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.result-actions button {
  flex: 1 1 200px;
  min-height: 52px;
}

/* せってい */
.settings-button {
  min-width: 110px;
}

.settings-panel {
  background: var(--ym-surface);
  border: 2px solid var(--ym-green);
  border-radius: var(--ym-radius);
  padding: 18px;
  margin-bottom: 16px;
}

.settings-panel h2 {
  margin: 0 0 12px;
  font-size: 1.15rem;
  color: var(--ym-heading);
}

.setting-group {
  border: 2px solid var(--ym-border);
  border-radius: var(--ym-radius);
  margin: 0 0 12px;
  padding: 10px 14px 14px;
}

.setting-group legend {
  font-weight: 700;
  color: var(--ym-heading);
  padding: 0 6px;
}

.setting-option {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  cursor: pointer;
}

.setting-option input {
  width: 22px;
  height: 22px;
}

.setting-note {
  font-size: 0.9rem;
  color: var(--ym-muted);
  margin: 0 0 12px;
}

.app-footer {
  margin-top: 24px;
  text-align: center;
  color: var(--ym-muted);
  font-size: 0.85rem;
}

.app-footer p {
  margin: 0;
}

@media (max-width: 400px) {
  .app-shell {
    padding: 12px 10px 40px;
  }
  .screen {
    padding: 16px 12px 20px;
  }
  .story-body,
  .question-text {
    font-size: 1.15rem;
  }
  .hint-bar {
    flex-direction: column;
  }
  .hint-bar button {
    width: 100%;
  }
}