/* ==========================================================================
   easyQA 共通スタイル
   教育向けQAアプリケーション — 日本語UIを前提としたシンプルなデザイン
   ========================================================================== */

/* --------------------------------------------------------------------------
   リセットと基本設定
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  color: #333333;
  background-color: #f5f5f5;
  min-height: 100vh;
  padding: 0;
}

/* --------------------------------------------------------------------------
   コンテナ（中央寄せ・最大幅制限）
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 16px;
}

/* --------------------------------------------------------------------------
   ヘッダー（ページタイトル + サインアウトボタン配置）
   -------------------------------------------------------------------------- */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  margin-bottom: 24px;
  border-bottom: 1px solid #e0e0e0;
}

.header__title {
  font-size: 1.25rem;
  font-weight: bold;
  color: #333333;
}

.header__actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* --------------------------------------------------------------------------
   ボタン共通
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: bold;
  text-align: center;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s, opacity 0.2s, transform 0.1s;
  text-decoration: none;
  line-height: 1.4;
}

.btn:hover {
  opacity: 0.85;
}

.btn:active {
  transform: scale(0.96);
  filter: brightness(0.88);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* プライマリボタン（青） */
.btn--primary {
  background-color: #2196F3;
  color: #ffffff;
}

.btn--primary:hover {
  background-color: #1976D2;
}

/* セカンダリボタン（グレー） */
.btn--secondary {
  background-color: #757575;
  color: #ffffff;
}

.btn--secondary:hover {
  background-color: #616161;
}

/* 危険色ボタン（赤） */
.btn--danger {
  background-color: #f44336;
  color: #ffffff;
}

.btn--danger:hover {
  background-color: #d32f2f;
}

/* サインアウトボタン（小サイズ） */
.btn--signout {
  padding: 6px 14px;
  font-size: 0.8rem;
  background-color: #757575;
  color: #ffffff;
}

.btn--signout:hover {
  background-color: #616161;
}

/* --------------------------------------------------------------------------
   フォーム要素
   -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.875rem;
  font-weight: bold;
  color: #555555;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="date"],
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  font-size: 0.9rem;
  border: 1px solid #cccccc;
  border-radius: 4px;
  background-color: #ffffff;
  color: #333333;
  transition: border-color 0.2s;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: #2196F3;
  box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.2);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* --------------------------------------------------------------------------
   メッセージ（エラー・成功）
   -------------------------------------------------------------------------- */
.message {
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 0.85rem;
  margin-bottom: 16px;
  display: none;
}

.message--error {
  background-color: #ffebee;
  color: #f44336;
  border: 1px solid #ffcdd2;
  display: block;
}

.message--success {
  background-color: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #c8e6c9;
  display: block;
}

/* インラインエラー（フォーム要素直下） */
.error-text {
  color: #f44336;
  font-size: 0.8rem;
  margin-top: 4px;
  display: none;
}

.error-text--visible {
  display: block;
}

/* --------------------------------------------------------------------------
   ロール選択ボタン（サインインページ）
   -------------------------------------------------------------------------- */
.role-selector {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.role-selector__btn {
  flex: 1;
  padding: 14px 8px;
  font-size: 0.95rem;
  font-weight: bold;
  text-align: center;
  white-space: nowrap;
  border: 2px solid #cccccc;
  border-radius: 8px;
  background-color: #ffffff;
  color: #555555;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s, color 0.2s, transform 0.1s;
}

.role-selector__btn:active {
  transform: scale(0.96);
  filter: brightness(0.88);
}

.role-selector__btn:hover {
  border-color: #2196F3;
  color: #2196F3;
}

/* アクティブ状態のハイライト */
.role-selector__btn--active {
  border-color: #2196F3;
  background-color: #e3f2fd;
  color: #1565C0;
}

/* --------------------------------------------------------------------------
   サインインフォームコンテナ
   -------------------------------------------------------------------------- */
.signin-container {
  max-width: 400px;
  margin: 60px auto;
  padding: 32px;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.signin-container__title {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 24px;
  color: #333333;
}

/* --------------------------------------------------------------------------
   質問カード
   -------------------------------------------------------------------------- */
.question-list {
  margin-top: 24px;
}

.question-card {
  background-color: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 12px;
  transition: box-shadow 0.2s;
}

.question-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.question-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 0.8rem;
  color: #757575;
}

.question-card__number {
  font-weight: bold;
  color: #2196F3;
}

.question-card__date {
  color: #9e9e9e;
}

.question-card__name {
  font-size: 0.8rem;
  color: #757575;
  margin-bottom: 4px;
}

.question-card__content {
  font-size: 0.9rem;
  color: #333333;
  line-height: 1.6;
  margin-bottom: 12px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* --------------------------------------------------------------------------
   回答エリア（質問カード内）
   -------------------------------------------------------------------------- */
.answer-area {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #eeeeee;
}

.answer-area__label {
  font-size: 0.8rem;
  font-weight: bold;
  color: #4CAF50;
  margin-bottom: 4px;
}

.answer-area__content {
  font-size: 0.875rem;
  color: #333333;
  line-height: 1.6;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* 未回答ラベル */
.answer-area__unanswered {
  font-size: 0.8rem;
  color: #9e9e9e;
  font-style: italic;
}

/* --------------------------------------------------------------------------
   回答入力エリア（インストラクターページ）
   -------------------------------------------------------------------------- */
.answer-form {
  margin-top: 12px;
  padding: 12px;
  background-color: #fafafa;
  border-radius: 4px;
  border: 1px solid #e0e0e0;
}

.answer-form textarea {
  width: 100%;
  padding: 10px;
  font-size: 0.875rem;
  border: 1px solid #cccccc;
  border-radius: 4px;
  resize: vertical;
  min-height: 80px;
  font-family: inherit;
}

.answer-form textarea:focus {
  outline: none;
  border-color: #2196F3;
  box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.2);
}

.answer-form__actions {
  margin-top: 8px;
  text-align: right;
}

/* --------------------------------------------------------------------------
   質問選択可能カード（インストラクターページ）
   -------------------------------------------------------------------------- */
.question-card--selectable {
  cursor: pointer;
}

.question-card--selectable:hover {
  border-color: #2196F3;
}

.question-card--selected {
  border-color: #2196F3;
  box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.15);
}

/* --------------------------------------------------------------------------
   インストラクター選択UI（サインイン後のアクション選択）
   -------------------------------------------------------------------------- */
.action-selector {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.action-selector__btn {
  padding: 14px 8px;
  font-size: 0.875rem;
  font-weight: bold;
  text-align: center;
  white-space: nowrap;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  background-color: #ffffff;
  color: #333333;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s, transform 0.1s;
}

.action-selector__btn:hover {
  border-color: #2196F3;
  background-color: #e3f2fd;
}

.action-selector__btn:active {
  transform: scale(0.96);
  filter: brightness(0.88);
}

/* --------------------------------------------------------------------------
   クラス一覧テーブル（クラス登録ページ）
   -------------------------------------------------------------------------- */
.class-list {
  margin-top: 32px;
}

.class-list__title {
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: 12px;
  color: #333333;
}

.class-table {
  width: 100%;
  border-collapse: collapse;
  background-color: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.class-table th,
.class-table td {
  padding: 10px 12px;
  text-align: left;
  font-size: 0.85rem;
  border-bottom: 1px solid #eeeeee;
}

.class-table th {
  background-color: #f5f5f5;
  font-weight: bold;
  color: #555555;
}

.class-table tr {
  cursor: pointer;
  transition: background-color 0.15s;
}

.class-table tr:hover {
  background-color: #e3f2fd;
}

.class-table tr--selected {
  background-color: #bbdefb;
}

/* --------------------------------------------------------------------------
   セクションタイトル
   -------------------------------------------------------------------------- */
.section-title {
  font-size: 1.1rem;
  font-weight: bold;
  color: #333333;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #2196F3;
}

/* --------------------------------------------------------------------------
   ClassID 入力フォーム（インストラクター用）
   -------------------------------------------------------------------------- */
.classid-input {
  margin-top: 16px;
}

/* --------------------------------------------------------------------------
   URLリンク（質問・回答中のURL）
   -------------------------------------------------------------------------- */
.question-card__content a,
.answer-area__content a {
  color: #1976D2;
  text-decoration: underline;
  word-break: break-all;
}

.question-card__content a:hover,
.answer-area__content a:hover {
  color: #0D47A1;
}

/* --------------------------------------------------------------------------
   非表示ユーティリティ
   -------------------------------------------------------------------------- */
.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   ローディング表示
   -------------------------------------------------------------------------- */
.loading {
  text-align: center;
  padding: 24px;
  color: #757575;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   空の状態表示
   -------------------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: 32px;
  color: #9e9e9e;
  font-size: 0.9rem;
}

/* ==========================================================================
   レスポンシブ対応（min-width ベース — モバイルファースト）
   ========================================================================== */

/* 768px 以上：タブレット・デスクトップ */
@media (min-width: 768px) {
  body {
    padding: 0;
  }

  .container {
    padding: 24px;
  }

  .header {
    padding: 20px 0;
  }

  .header__title {
    font-size: 1.5rem;
  }

  .signin-container {
    padding: 40px;
    margin-top: 80px;
  }

  .signin-container__title {
    font-size: 1.75rem;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  .role-selector__btn {
    padding: 18px 12px;
    font-size: 1rem;
    white-space: nowrap;
  }

  .question-card {
    padding: 20px;
  }

  .question-card__content {
    font-size: 0.95rem;
  }

  .form-group input[type="text"],
  .form-group input[type="password"],
  .form-group input[type="date"],
  .form-group textarea,
  .form-group select {
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  .class-table th,
  .class-table td {
    padding: 12px 16px;
    font-size: 0.9rem;
  }

  .action-selector {
    flex-direction: row;
  }

  .action-selector__btn {
    flex: 1;
    padding: 16px 8px;
    font-size: 0.9rem;
    white-space: nowrap;
  }
}