/* =====================================================
   模試解説AIチューター - メインスタイルシート
   カラーパレット:
     --black        : #000000
     --prussian-blue: #14213D
     --orange       : #FCA311
     --grey         : #E5E5E5
     --white        : #FFFFFF
   ===================================================== */

/* ─── CSS カスタムプロパティ ─────────────────────────── */
:root {
    /* ブランドカラー */
    --black:         #000000;
    --prussian-blue: #14213D;
    --orange:        #FCA311;
    --grey:          #E5E5E5;
    --white:         #FFFFFF;

    /* セマンティックエイリアス */
    --color-bg:          var(--grey);
    --color-surface:     var(--white);
    --color-primary:     var(--prussian-blue);
    --color-accent:      var(--orange);
    --color-text:        var(--black);
    --color-text-muted:  #555555;
    --color-border:      #cccccc;
    --color-white:       var(--white);

    /* タイポグラフィ */
    --font-base: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;

    /* スペーシング・シェイプ */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 4px rgba(0,0,0,0.10);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.14);
    --transition: 0.18s ease;
}

/* ─── リセット & ベース ─────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.75;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}
a:hover {
    color: var(--orange);
    text-decoration: underline;
}

/* ─── アプリヘッダー ────────────────────────────────── */
.app-header {
    background-color: var(--prussian-blue);
    color: var(--white);
    padding: 0 1.5rem;
    height: 54px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.28);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.app-title {
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-decoration: none;
}
.app-title:hover {
    color: var(--orange);
    text-decoration: none;
}

/* ─── メインコンテンツ ──────────────────────────────── */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ─── 共通ページコンテナ ────────────────────────────── */
.page-container {
    max-width: 720px;
    margin: 2rem auto;
    padding: 0 1.25rem;
    width: 100%;
}

/* ─── ページヘッダー（パンくず + 戻るボタン） ─────── */
.page-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--prussian-blue);
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    padding: 0.35rem 0.75rem;
    border: 1.5px solid var(--prussian-blue);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition), color var(--transition);
}
.back-btn:hover {
    background-color: var(--prussian-blue);
    color: var(--white);
    text-decoration: none;
}

.breadcrumb-title {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ─── ページタイトル ────────────────────────────────── */
.page-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--prussian-blue);
    padding-bottom: 0.6rem;
    border-bottom: 3px solid var(--orange);
}

/* ─── リスト型カード ────────────────────────────────── */
.card-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.list-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--white);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    color: var(--color-text);
    font-weight: 600;
    font-size: 1rem;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
    cursor: pointer;
}
.list-card:hover {
    border-color: var(--orange);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
    color: var(--prussian-blue);
}

.list-card-text {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.list-card-subtitle {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-muted);
}

.list-card-arrow {
    font-size: 1.2rem;
    color: var(--orange);
    font-weight: 700;
}

/* ─── グリッド型カード ──────────────────────────────── */
.grid-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.75rem;
}

.grid-card {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--white);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem 0.75rem;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.05rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
    cursor: pointer;
    min-height: 80px;
}
.grid-card:hover {
    border-color: var(--orange);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
    color: var(--prussian-blue);
}

/* ─── セクションラベル（学年グループ見出し） ────────── */
.section-label {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--white);
    background-color: var(--prussian-blue);
    display: inline-block;
    padding: 0.2rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
}

/* ─── 空メッセージ ──────────────────────────────────── */
.empty-message {
    color: var(--color-text-muted);
    text-align: center;
    padding: 2rem;
    font-size: 0.95rem;
}

/* ─── 解説画面レイアウト ────────────────────────────── */
.explanation-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 54px);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.explanation-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background-color: var(--white);
    border-bottom: 2px solid var(--orange);
    flex-shrink: 0;
}

/* ─── チャット履歴エリア ────────────────────────────── */
.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background-color: var(--grey);
}

/* ─── チャットカード ────────────────────────────────── */
.chat-card {
    max-width: 85%;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    line-height: 1.75;
    font-size: 0.975rem;
    animation: fadeInUp 0.22s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* AIカード：白背景 + オレンジ左ボーダー */
.ai-card {
    background-color: var(--white);
    border: 1.5px solid var(--color-border);
    border-left: 4px solid var(--orange);
    align-self: flex-start;
    border-bottom-left-radius: var(--radius-sm);
}

.ai-card::before {
    content: '🤖';
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

/* ユーザーカード：Prussian Blue 背景 */
.user-card {
    background-color: var(--prussian-blue);
    color: var(--white);
    border: none;
    align-self: flex-end;
    border-bottom-right-radius: var(--radius-sm);
}

.user-card::before {
    content: '👤';
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    text-align: right;
    opacity: 0.85;
}

/* ─── チャットカード内のMarkdown要素 ─────────────────── */
.chat-card p {
    margin-bottom: 0.75rem;
}
.chat-card p:last-child {
    margin-bottom: 0;
}

.chat-card h1, .chat-card h2, .chat-card h3 {
    margin: 0.75rem 0 0.5rem;
    font-size: 1rem;
    color: var(--prussian-blue);
}

.chat-card ul, .chat-card ol {
    margin: 0.5rem 0 0.5rem 1.5rem;
}
.chat-card li {
    margin-bottom: 0.25rem;
}

.chat-card table {
    border-collapse: collapse;
    margin: 0.75rem 0;
    font-size: 0.9rem;
    width: 100%;
}
.chat-card th {
    background-color: var(--prussian-blue);
    color: var(--white);
    padding: 0.4rem 0.75rem;
    text-align: left;
    border: 1px solid var(--prussian-blue);
    font-weight: 600;
}
.chat-card td {
    border: 1px solid var(--color-border);
    padding: 0.4rem 0.75rem;
    text-align: left;
}
.chat-card tr:nth-child(even) td {
    background-color: var(--grey);
}

.chat-card code {
    background-color: var(--grey);
    border: 1px solid var(--color-border);
    padding: 0.1em 0.35em;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: 'Courier New', monospace;
    color: var(--prussian-blue);
}

.chat-card pre {
    background-color: var(--grey);
    border: 1px solid var(--color-border);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 0.5rem 0;
}
.chat-card pre code {
    background: none;
    border: none;
    padding: 0;
}

.chat-card strong {
    font-weight: 700;
    color: var(--prussian-blue);
}

.chat-card em {
    font-style: italic;
    color: var(--color-text-muted);
}

.chat-card blockquote {
    border-left: 3px solid var(--orange);
    padding-left: 0.75rem;
    color: var(--color-text-muted);
    margin: 0.5rem 0;
    font-style: italic;
}

/* ユーザーカード内は白テキストを維持 */
.user-card strong,
.user-card em,
.user-card code {
    color: var(--white);
}
.user-card code {
    background-color: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.3);
}

/* ─── ローディングインジケーター ────────────────────── */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 2rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--orange);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ─── タイピングインジケーター ──────────────────────── */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 1rem;
    background-color: var(--white);
    border: 1.5px solid var(--color-border);
    border-left: 4px solid var(--orange);
    border-radius: var(--radius-lg);
    border-bottom-left-radius: var(--radius-sm);
    align-self: flex-start;
    max-width: 120px;
    box-shadow: var(--shadow-sm);
}

.typing-dot {
    width: 8px;
    height: 8px;
    background-color: var(--orange);
    border-radius: 50%;
    animation: typingBounce 1.2s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.6; }
    30%           { transform: translateY(-6px); opacity: 1; }
}

/* ─── 入力エリア ────────────────────────────────────── */
.input-area {
    flex-shrink: 0;
    background-color: var(--white);
    border-top: 2px solid var(--orange);
    padding: 0.75rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* ─── 選択肢ボタンエリア ────────────────────────────── */
.button-area {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.choice-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.45rem 1rem;
    background-color: var(--white);
    border: 2px solid var(--prussian-blue);
    border-radius: 9999px;
    color: var(--prussian-blue);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition), color var(--transition), transform var(--transition);
    font-family: var(--font-base);
}
.choice-btn:hover:not(:disabled) {
    background-color: var(--prussian-blue);
    color: var(--white);
    transform: translateY(-1px);
}
.choice-btn:active:not(:disabled) {
    transform: translateY(0);
}
.choice-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* 「わからない」ボタン：オレンジ系 */
.hint-btn {
    border-color: var(--orange);
    color: var(--orange);
}
.hint-btn:hover:not(:disabled) {
    background-color: var(--orange);
    color: var(--white);
    border-color: var(--orange);
}

/* ─── 自由入力エリア ────────────────────────────────── */
.free-input-area {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
}

.free-input {
    flex: 1;
    padding: 0.6rem 0.875rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: var(--font-base);
    line-height: 1.5;
    resize: none;
    outline: none;
    background: var(--white);
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
    min-height: 42px;
    max-height: 120px;
}
.free-input:focus {
    border-color: var(--orange);
    box-shadow: 0 0 0 2px rgba(252, 163, 17, 0.20);
}
.free-input:disabled {
    background: var(--grey);
    opacity: 0.6;
}

.send-btn {
    padding: 0.6rem 1.25rem;
    background-color: var(--orange);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition);
    white-space: nowrap;
    font-family: var(--font-base);
    height: 42px;
}
.send-btn:hover:not(:disabled) {
    background-color: #e8920a;
    transform: translateY(-1px);
}
.send-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* ─── 完了エリア ────────────────────────────────────── */
.complete-area {
    flex-shrink: 0;
    background-color: var(--white);
    border-top: 2px solid var(--orange);
    padding: 1rem 1.25rem;
}

.complete-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.complete-btn {
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    transition: background-color var(--transition), transform var(--transition);
    font-family: var(--font-base);
    border: none;
}

.primary-btn {
    background-color: var(--orange);
    color: var(--white);
}
.primary-btn:hover {
    background-color: #e8920a;
    color: var(--white);
    text-decoration: none;
    transform: translateY(-1px);
}

.secondary-btn {
    background-color: var(--prussian-blue);
    color: var(--white);
}
.secondary-btn:hover {
    background-color: #0d1829;
    color: var(--white);
    text-decoration: none;
    transform: translateY(-1px);
}

/* ─── エラーカード ──────────────────────────────────── */
.error-card {
    background: #fff3f3;
    border: 1.5px solid #e57373;
    border-left: 4px solid #e53935;
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    color: #c62828;
    font-size: 0.9rem;
    align-self: flex-start;
    max-width: 85%;
}

/* ─── スクロールバー（Webkit） ──────────────────────── */
.chat-history::-webkit-scrollbar {
    width: 6px;
}
.chat-history::-webkit-scrollbar-track {
    background: var(--grey);
}
.chat-history::-webkit-scrollbar-thumb {
    background: #bbbbbb;
    border-radius: 3px;
}
.chat-history::-webkit-scrollbar-thumb:hover {
    background: var(--prussian-blue);
}

/* ─── レスポンシブ ──────────────────────────────────── */
@media (max-width: 600px) {
    .page-container {
        margin: 1rem auto;
        padding: 0 0.875rem;
    }

    .chat-card {
        max-width: 92%;
        padding: 0.875rem 1rem;
        font-size: 0.92rem;
    }

    .choice-btn {
        font-size: 0.85rem;
        padding: 0.4rem 0.875rem;
    }

    .send-btn {
        padding: 0.6rem 0.875rem;
        font-size: 0.88rem;
    }

    .explanation-header {
        padding: 0.6rem 0.875rem;
    }

    .breadcrumb-title {
        font-size: 0.82rem;
    }

    .complete-btn {
        padding: 0.55rem 1.1rem;
        font-size: 0.88rem;
    }
}

/* ─── 小問リスト（モード選択付き） ─────────────────────── */
.minor-question-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.minor-question-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background-color: var(--white);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.875rem 1.25rem;
    box-shadow: var(--shadow-sm);
}

.minor-question-number {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--prussian-blue);
    min-width: 3rem;
}

.minor-question-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.mode-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.45rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color var(--transition), color var(--transition), transform var(--transition);
    white-space: nowrap;
    border: 2px solid transparent;
}
.mode-btn:hover {
    transform: translateY(-1px);
    text-decoration: none;
}

.mode-btn--chat {
    background-color: var(--prussian-blue);
    color: var(--white);
    border-color: var(--prussian-blue);
}
.mode-btn--chat:hover {
    background-color: #0d1829;
    color: var(--white);
}

.mode-btn--ai {
    background-color: var(--white);
    color: var(--orange);
    border-color: var(--orange);
}
.mode-btn--ai:hover {
    background-color: var(--orange);
    color: var(--white);
}

/* ─── チャット解説UI（chat_explanation.php） ─────────── */
.chat-exp-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 54px);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    background: #e5ddd5;
}

.chat-exp-header {
    background-color: var(--prussian-blue);
    color: var(--white);
    padding: 0.55rem 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    flex-shrink: 0;
}

.chat-exp-back-btn {
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.15rem;
    line-height: 1;
    text-decoration: none;
    display: flex;
    align-items: center;
}
.chat-exp-back-btn:hover {
    color: var(--orange);
    text-decoration: none;
}

.chat-exp-avatar {
    width: 38px;
    height: 38px;
    background-color: var(--orange);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.chat-exp-title {
    flex: 1;
    min-width: 0;
}
.chat-exp-title h3 {
    font-size: 0.92rem;
    font-weight: 700;
    margin-bottom: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.chat-exp-title span {
    font-size: 0.78rem;
    opacity: 0.8;
}

/* レベル選択バー */
.chat-exp-level-bar {
    background-color: var(--white);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.level-bar-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.level-bar-buttons {
    display: flex;
    gap: 0.4rem;
}

.level-bar-btn {
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--color-border);
    background: var(--white);
    color: var(--color-text-muted);
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-base);
}
.level-bar-btn:hover {
    border-color: var(--prussian-blue);
    color: var(--prussian-blue);
}
.level-bar-btn.active {
    background-color: var(--prussian-blue);
    border-color: var(--prussian-blue);
    color: var(--white);
}
.level-bar-btn.active[data-level="-1"] { background-color: #2196F3; border-color: #2196F3; }
.level-bar-btn.active[data-level="-2"] { background-color: #FF9800; border-color: #FF9800; }
.level-bar-btn.active[data-level="-3"] { background-color: #F44336; border-color: #F44336; }

/* メッセージエリア */
.chat-exp-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0.9rem 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.chat-exp-messages::-webkit-scrollbar { width: 6px; }
.chat-exp-messages::-webkit-scrollbar-track { background: transparent; }
.chat-exp-messages::-webkit-scrollbar-thumb { background: #bbbbbb; border-radius: 3px; }

/* バブル共通 */
.exp-bubble {
    display: inline-block;
    width: fit-content;
    max-width: 100%;
    min-width: 0;
    padding: 0.58rem 0.85rem;
    border-radius: 10px;
    position: relative;
    animation: bubbleIn 0.25s ease-out;
    line-height: 1.55;
    font-size: 0.94rem;
    cursor: pointer;
    word-break: normal;
    overflow-wrap: anywhere;
}

@keyframes bubbleIn {
    from { opacity: 0; transform: translateY(16px) scale(0.95); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* 通常バブル（白） */
.exp-bubble.received {
    background: var(--white);
    align-self: flex-start;
    border-bottom-left-radius: 3px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}
.exp-bubble.received::before {
    content: '';
    position: absolute;
    left: -7px;
    bottom: 0;
    width: 0;
    height: 0;
    border: 7px solid transparent;
    border-right-color: var(--white);
    border-bottom-color: var(--white);
}

/* 省略バブル */
.exp-bubble.skipped {
    background: #f0f0f0;
    align-self: flex-start;
    border-bottom-left-radius: 3px;
    border: 2px dashed #ccc;
    padding: 0.45rem 0.72rem;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition);
}
.exp-bubble.skipped:hover {
    background: #e8e8e8;
    border-color: #999;
}
.exp-bubble.skipped::before {
    content: '';
    position: absolute;
    left: -7px;
    bottom: 0;
    border: 7px solid transparent;
    border-right-color: #f0f0f0;
    border-bottom-color: #f0f0f0;
}

/* 展開済みバブル */
.exp-bubble.expanded {
    background: #fff9e6;
    border: 2px solid var(--orange);
    align-self: flex-start;
    border-bottom-left-radius: 3px;
}
.exp-bubble.expanded::before {
    border-right-color: #fff9e6;
    border-bottom-color: #fff9e6;
}

.expanded-header {
    font-size: 0.75rem;
    color: var(--orange);
    margin-bottom: 0.35rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px dashed var(--orange);
}

/* バブル内コンテンツ */
.bubble-level-badge {
    display: inline-block;
    padding: 0.15rem 0.6rem;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.4rem;
    background: #4CAF50;
    white-space: nowrap;
}
.bubble-level-badge[data-level="-1"] { background: #2196F3; }
.bubble-level-badge[data-level="-2"] { background: #FF9800; }
.bubble-level-badge[data-level="-3"] { background: #F44336; }

.bubble-content { color: #333; }
.bubble-content p { margin: 0.3rem 0; }
.bubble-content p:first-child { margin-top: 0; }
.bubble-content p:last-child { margin-bottom: 0; }
.bubble-content h2, .bubble-content h3 { margin: 0.6rem 0 0.3rem; color: var(--prussian-blue); font-size: 0.95rem; }
.bubble-content strong { font-weight: 700; color: var(--prussian-blue); }
.bubble-content em { font-style: italic; color: var(--color-text-muted); }
.bubble-content code { background: var(--grey); padding: 0.1em 0.3em; border-radius: 3px; font-size: 0.88em; }
.bubble-content img { max-width: 100%; height: auto; border-radius: 6px; margin: 0.5rem 0; }
.bubble-content ul, .bubble-content ol { margin: 0.3rem 0 0.3rem 1.25rem; }
.bubble-content li { margin-bottom: 0.15rem; }

.bubble-time {
    font-size: 0.7rem;
    color: #999;
    text-align: right;
    margin-top: 0.4rem;
}

/* 省略バブル内 */
.skipped-indicator {
    display: flex;
    align-items: center;
    gap: 0.42rem;
    color: #888;
    font-size: 0.82rem;
    line-height: 1.25;
    white-space: nowrap;
}
.skipped-dots { font-size: 1rem; letter-spacing: 2px; color: #aaa; }
.skipped-meta {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    min-width: 0;
}
.skipped-info { font-size: 0.75rem; color: #999; }
.skipped-tag {
    display: inline-block;
    background: var(--prussian-blue);
    color: var(--white);
    padding: 0.1rem 0.5rem;
    border-radius: 8px;
    font-size: 0.72rem;
    font-weight: 700;
}
.tap-hint-text {
    font-size: 0.68rem;
    color: var(--orange);
    margin-left: auto;
}

/* フッター */
.chat-exp-footer {
    background: #f0f0f0;
    padding: 0.45rem 0.9rem;
    border-top: 1px solid #ddd;
    flex-shrink: 0;
}

.chat-footer-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    min-width: 0;
}

.chat-tap-hint {
    color: #555;
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    white-space: nowrap;
}
.tap-icon-anim {
    font-size: 1.05rem;
    animation: pulse 1.5s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.4; }
}

.chat-complete-msg {
    background: #dcf8c6;
    padding: 0.25rem 0.7rem;
    border-radius: 20px;
    color: #333;
    font-weight: 700;
    font-size: 0.8rem;
    display: inline-block;
}

.chat-exp-progress {
    font-size: 0.78rem;
    color: #777;
    white-space: nowrap;
}

.skip-legend {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.875rem;
    margin-top: 0.5rem;
    font-size: 0.72rem;
    color: #888;
}
.skip-legend-item { display: flex; align-items: center; gap: 0.3rem; }
.legend-box { width: 14px; height: 14px; border-radius: 3px; border: 2px dashed #ccc; background: #f0f0f0; }

/* レスポンシブ */
@media (max-width: 600px) {
    .minor-question-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    .minor-question-actions {
        width: 100%;
        justify-content: flex-start;
    }
    .mode-btn {
        font-size: 0.82rem;
        padding: 0.4rem 0.875rem;
    }
    .chat-exp-level-bar {
        padding: 0.45rem 0.75rem;
    }
    .exp-bubble {
        font-size: 0.88rem;
    }
    .chat-exp-header {
        padding: 0.5rem 0.75rem;
    }
    .chat-footer-main {
        gap: 0.55rem;
    }
    .chat-tap-hint {
        font-size: 0.76rem;
    }
    .chat-exp-progress {
        font-size: 0.72rem;
    }
}