/* =========================
   全体基本設定
========================= */

html {
  font-size: 14px;
}

body {
  margin: 0;
  padding: 0;
  /* font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; */
  font-family: "JetBrains Mono", monospace;
  line-height: 1.5;
  background: #f5f6f8;
  color: #222;
}

/* =========================
   レイアウト
========================= */

#app {
  max-width: 900px;
  margin: 0 auto;
  padding: 12px;
}

.app-header {
  margin-bottom: 10px;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: nowrap;
  /* 高さ増加を防ぐ */
}

/* タイトル余白調整 */
.app-header h1 {
  margin: 0;
  white-space: nowrap;
}

/* 各ブロック横並び */
.mode-switch,
.resume-area,
.top-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 0;
  /* 縦余白を消す */
}

/* モード表示も縦余白削除 */
.mode-indicator {
  margin-bottom: 0;
  white-space: nowrap;
}


/* =========================
   モード切替
========================= */

.mode-switch {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.mode-btn {
  font-size: 0.85rem;
  padding: 4px 10px;
  border: 1px solid #bbb;
  background: #fff;
  border-radius: 4px;
  cursor: pointer;
}

.mode-btn.active {
  background: #3b82f6;
  color: #fff;
  border-color: #3b82f6;
}

.mode-indicator {
  font-size: 0.8rem;
  color: #555;
  margin-bottom: 6px;
}

/* =========================
   ナビゲーションボタン
========================= */

.nav-buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 8px 0;
}

.nav-buttons button {
  min-width: 110px;
  padding: 6px 12px;
  font-size: 0.85rem;
  border-radius: 6px;
  border: 1px solid #aaa;
  background: #ffffff;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

.nav-buttons button:hover:not(:disabled) {
  background: #e8f0ff;
}

.nav-buttons button:disabled {
  opacity: 0.4;
  cursor: default;
}

.top-nav {
  margin-bottom: 6px;
  display: inline;
  position: relative;
  left: 160px;
}

.bottom-nav {
  margin-top: 10px;
}

/* =========================
   問題表示
========================= */

.question-header {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 6px;
}

#question-text {
  font-size: 1rem;
  margin-bottom: 8px;
  white-space: pre-wrap;
  word-break: break-word;
}

/* =========================
   選択肢
========================= */

#choices-container label {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.9rem;
  margin-bottom: -4px;
  padding: 3px 5px;
  border-radius: 4px;
  cursor: pointer;
}

.choice-text {
  flex: 1;
}

/* バリデーションメッセージ */
#validation-msg {
  margin-top: 6px;
  color: #dc2626;
  font-weight: 600;
  font-size: 0.85rem;
}

/* 不正解時：正解選択肢をハイライト */
.correct-choice {
  background: #dcfce7;
  border-left: 4px solid #22c55e;
  padding-left: 6px;
  font-weight: 600;
}


/* =========================
   回答ボタン
========================= */

#submit-btn-container {
  display: flex;
  justify-content: center;
}

#submit-btn {
  margin-top: 8px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, transform 0.05s;
}

#submit-btn:hover {
  background: #1d4ed8;
}

#submit-btn:active {
  transform: translateY(1px);
}

#submit-btn:disabled {
  background: #9ca3af;
  cursor: default;
}

#reset-score-btn {
  margin-top: 2px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, transform 0.05s;
}

#reset-score-btn:hover {
  background: #1d4ed8;
}

#reset-score-btn:active {
  transform: translateY(1px);
}

#reset-score-btn:disabled {
  background: #9ca3af;
  cursor: default;
}

/* =========================
   メッセージ
========================= */

#message {
  margin-top: 6px;
  color: #dc2626;
  font-weight: 600;
  font-size: 0.85rem;
}

/* =========================
   解説表示
========================= */

#explanation-container {
  margin-top: 8px;
  padding: 8px;
  border-radius: 6px;
  font-size: 0.85rem;
  white-space: normal;
}

.correct-ui {
  background: #ecfdf5;
  border: 2px solid #22c55e;
  color: #166534;
  font-weight: 600;
}

.wrong-ui {
  background: #fef2f2;
  border: 2px solid #ef4444;
  color: #7f1d1d;
  font-weight: 600;
}

/* 解説本文は少し落ち着かせる */
#explanation-container p,
#explanation-container div {
  font-weight: 400;
}

/* =========================
   スコア表示
========================= */

#score-panel {
  margin-top: 10px;
  display: flex;
  gap: 12px;
  font-size: 0.8rem;
}

.score-item {
  color: #444;
}

.score-item.highlight {
  font-weight: bold;
}

/* =========================
   共通
========================= */

.hidden {
  display: none;
}

.question-number {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 6px;
}

/* 前回から再開ボタン配置 */
.resume-area {
  margin-bottom: 6px;
}

.resume-area .mode-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

/* =========================
   データセット切替
========================= */

.dataset-switch {
  display: flex;
  align-items: center;
  gap: 6px;
}

#dataset-select {
  font-size: 0.85rem;
  padding: 4px 8px;
  border: 1px solid #bbb;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  height: 28px;
}

#dataset-select:focus {
  outline: none;
  border-color: #3b82f6;
}

/* =========================
   スマホ用（768px以下）
========================= */

@media (max-width: 768px) {

  html {
    font-size: 16px;
  }

  body {
    line-height: 1.6;
  }

  #app {
    padding: 14px;
  }

  /* ヘッダー縦並び */
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .app-header h1 {
    font-size: 1.3rem;
  }

  /* モード・再開・ナビは折り返し */
  .mode-switch,
  .resume-area,
  .top-nav,
  .dataset-switch {
    flex-wrap: wrap;
    gap: 8px;
  }

  .top-nav {
    position: static;
    left: auto;
  }

  /* ボタン全体を押しやすく */
  .mode-btn,
  .nav-buttons button,
  #submit-btn {
    font-size: 1rem;
    padding: 10px 14px;
    min-height: 44px;
  }

  /* ナビボタン縦並び */
  .nav-buttons {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .nav-buttons button {
    width: 100%;
  }

  /* 問題文 */
  #question-text {
    font-size: 1.1rem;
  }

  /* 画像横いっぱい */
  #question-text img,
  #explanation-container img {
    width: 100%;
    height: auto;
    display: block;
  }

  /* 選択肢をタップ向けに拡張 */
  #choices-container label {
    font-size: 1.05rem;
    padding: 10px 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* 解説 */
  #explanation-container {
    font-size: 0.95rem;
  }

  /* スコア折り返し */
  #score-panel {
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.9rem;
  }

  .dataset-switch {
    width: 100%;
  }

  #dataset-select {
    width: 100%;
    font-size: 1rem;
    padding: 10px 12px;
    min-height: 44px;
  }

}