/* ==========================================================================
   DeepSeek Chinese API - デザインシステム
   ========================================================================== */

:root {
    /* カラーパレット (深海の紺・DeepSeek青・発光シアン) */
    --color-bg: #0a0e1a;              /* 最深部の海 */
    --color-sidebar: #101728;
    --color-card: #182338;
    --color-border: #243350;
    --color-border-focus: #4d6bfe;

    --color-text-primary: #e6ecf8;
    --color-text-secondary: #9fb0d0;
    --color-text-muted: #6b7a99;

    --color-primary: #4d6bfe;         /* DeepSeek青 (主役) */
    --color-primary-dark: #3050d0;    /* 押下・ホバー */
    --color-primary-light: #7b90ff;   /* 薄青 */
    --color-accent: #5ad0e0;          /* 発光シアン (差し色) */
    --color-accent-hover: #a8ecf5;    /* ライトシアン */
    --color-danger: #e05260;          /* 警告 */
    --color-danger-hover: #f0707c;

    /* ステータスカラー */
    --color-freetalk: #5ad0e0;
    --color-tutor: #4d6bfe;

    /* タイポグラフィ */
    --font-primary: 'Outfit', 'Noto Sans JP', 'Noto Sans SC', sans-serif;
    
    /* その他効果 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   基本設定とスクロールバー
   ========================================================================== */

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    height: 100vh;
    overflow: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* スクロールバーのカスタマイズ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ==========================================================================
   レイアウトコンテナ
   ========================================================================== */

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* ==========================================================================
   サイドバー (Sidebar)
   ========================================================================== */

.sidebar {
    width: 320px;
    background-color: var(--color-sidebar);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 10;
}

.sidebar-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-md);
    font-size: 20px;
    font-weight: 700;
    color: var(--color-bg);
    box-shadow: var(--shadow-sm);
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.logo-sub {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    font-weight: 600;
}

/* モード切り替えタブ */
.sidebar-tabs {
    display: flex;
    padding: 12px 20px;
    gap: 8px;
    border-bottom: 1px solid var(--color-border);
}

.tab-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 4px;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 11px;
    font-weight: 600;
    transition: var(--transition);
}

.tab-btn:hover {
    background-color: var(--color-card);
    border-color: var(--color-text-muted);
}

.tab-btn.active {
    background-color: var(--color-card);
    border-color: var(--color-border-focus);
    color: var(--color-text-primary);
}

.tab-btn.active[data-mode="freetalk"] i { color: var(--color-freetalk); }
.tab-btn.active[data-mode="general"] i { color: var(--color-tutor); }

.tab-btn i {
    width: 18px;
    height: 18px;
}

/* スレッドコントロール */
.thread-controls {
    padding: 12px 20px 4px;
}

.new-chat-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px;
    background-color: var(--color-primary-dark);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    transition: var(--transition);
}

.new-chat-btn:hover {
    background-color: var(--color-primary);
    transform: translateY(-1px);
}

/* 会話スレッドリスト */
.threads-section {
    padding: 10px 20px;
    display: flex;
    flex-direction: column;
    max-height: 240px;
    overflow: hidden;
}

.thread-list {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-right: 4px;
    margin-top: 8px;
}

.thread-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-text-secondary);
    font-size: 13px;
}

.thread-item:hover {
    background-color: var(--color-card);
    color: var(--color-text-primary);
}

.thread-item.active {
    background-color: var(--color-card);
    border-left: 3px solid var(--color-accent);
    color: var(--color-text-primary);
    padding-left: 7px;
}

.thread-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 1;
    margin-right: 8px;
    text-align: left;
}

.thread-delete-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.thread-item:hover .thread-delete-btn {
    opacity: 1;
}

.thread-delete-btn:hover {
    color: var(--color-danger);
}

/* 学習ノート */
.notebook-section {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 10px 20px 20px;
    overflow: hidden;
    border-top: 1px solid var(--color-border);
}

.badge {
    background-color: var(--color-border);
    color: var(--color-accent);
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 10px;
    font-weight: 700;
}

.notebook-list {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-right: 4px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px 10px;
    color: var(--color-text-muted);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    margin-top: 10px;
}

.empty-state i {
    width: 24px;
    height: 24px;
    margin-bottom: 8px;
    opacity: 0.6;
}

.empty-state p {
    font-size: 12px;
}

/* ノートカード */
.note-item {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px;
    position: relative;
    transition: var(--transition);
}

.note-item:hover {
    border-color: var(--color-text-muted);
}

.note-chinese {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}

.note-pinyin {
    font-size: 12px;
    color: var(--color-accent);
    font-style: italic;
    margin-bottom: 6px;
}

.note-translation {
    font-size: 12px;
    color: var(--color-text-secondary);
}

.note-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 8px;
    border-top: 1px solid var(--color-border);
    padding-top: 8px;
}

.note-btn-action {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.note-btn-action:hover {
    color: var(--color-text-primary);
}

.note-btn-action.delete:hover {
    color: var(--color-danger);
}

/* サイドバーフッター */
.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--color-border);
    margin-top: auto; /* 上の要素を隠しても常に最下部に置く */
}

.settings-trigger-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.settings-trigger-btn:hover {
    background-color: var(--color-card);
    border-color: var(--color-border-focus);
    color: var(--color-accent);
}

/* ==========================================================================
   メインコンテンツ (Main Content)
   ========================================================================== */

.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg);
    position: relative;
}

/* チャットヘッダー */
.chat-header {
    height: 75px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    background-color: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(10px);
    z-index: 5;
}

#header-mode-description {
    font-size: 12px;
    color: var(--color-text-secondary);
}

/* エクスポート・アクションボタン */
.action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition);
}

.action-btn:hover {
    border-color: var(--color-border-focus);
    color: var(--color-accent);
    background-color: var(--color-sidebar);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background-color: var(--color-card);
    color: var(--color-text-primary);
}

/* チャットフィード */
.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* チャットメッセージの吹き出し */
.message {
    display: flex;
    gap: 16px;
    max-width: 80%;
    animation: messageSlideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.assistant {
    align-self: flex-start;
}

.avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: var(--color-card);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    border: 1px solid var(--color-border);
    flex-shrink: 0;
}

.message.user .avatar {
    background-color: var(--color-border);
    color: var(--color-accent);
    border-color: var(--color-border-focus);
}

.message.assistant .avatar {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: var(--color-text-primary);
}

.message-bubble {
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    position: relative;
}

.message.user .message-bubble {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary);
    border-bottom-right-radius: 4px;
    color: var(--color-text-primary);
}

.message.assistant .message-bubble {
    border-bottom-left-radius: 4px;
}

.message-text {
    font-size: 15px;
    word-break: break-word;
}

/* Markdownの表示調整 */
.message-text p {
    margin-bottom: 8px;
}
.message-text p:last-child {
    margin-bottom: 0;
}
.message-text code {
    background-color: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 13px;
    color: var(--color-accent);
}
.message-text pre {
    background-color: rgba(0, 0, 0, 0.4);
    padding: 12px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 8px 0;
}
.message-text pre code {
    background-color: transparent;
    padding: 0;
}

/* アシスタントメッセージ用のアクション (スピーカー、ブックマークなど) */
.message-actions {
    display: flex;
    gap: 12px;
    margin-top: 10px;
    border-top: 1px solid var(--color-border);
    padding-top: 8px;
}

.msg-action-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    transition: var(--transition);
}

.msg-action-btn:hover {
    color: var(--color-text-primary);
}

.msg-action-btn.star:hover,
.msg-action-btn.star.starred {
    color: var(--color-accent);
}

/* ローディングスピナー（AI返答中） */
.typing-indicator {
    display: flex;
    gap: 4px;
    align-items: center;
    padding: 4px 8px;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background-color: var(--color-text-muted);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* ==========================================================================
   入力エリア (Chat Input Area)
   ========================================================================== */

.chat-input-area {
    padding: 24px 32px;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

.api-warning-banner {
    background-color: rgba(224, 82, 96, 0.15);
    border: 1px solid var(--color-danger);
    color: #ffd9dd;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.text-link-btn {
    background: transparent;
    border: none;
    color: var(--color-accent);
    text-decoration: underline;
    cursor: pointer;
    font-weight: 600;
    margin-left: auto;
}

.text-link-btn:hover {
    color: var(--color-accent-hover);
}

.chat-form {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 12px 16px;
    transition: var(--transition);
}

.chat-form:focus-within {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 12px rgba(77, 107, 254, 0.25);
}

.chat-form textarea {
    flex-grow: 1;
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 15px;
    outline: none;
    resize: none;
    max-height: 150px;
    line-height: 1.5;
}

.chat-form textarea::placeholder {
    color: var(--color-text-muted);
}

/* マイクボタン */
.mic-button {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.mic-button:hover {
    background-color: var(--color-border);
    color: var(--color-accent);
}

/* 音声認識中（録音中）のアクティブスタイル */
.mic-button.listening {
    background-color: var(--color-danger);
    color: white;
    animation: micPulse 1.5s infinite ease-in-out;
}

@keyframes micPulse {
    0% {
        box-shadow: 0 0 0 0 rgba(224, 82, 96, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(224, 82, 96, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(224, 82, 96, 0);
    }
}

.send-button {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border: none;
    color: white;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    transform: scale(1.05);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

.send-button:disabled {
    background: var(--color-border);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

/* ==========================================================================
   モーダル / 設定画面 (Modal Settings)
   ========================================================================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: var(--transition);
}

.modal {
    background-color: var(--color-card);
    border: 1px solid var(--color-border-focus);
    border-radius: var(--radius-lg);
    width: 500px;
    max-width: 90%;
    box-shadow: var(--shadow-lg);
    animation: modalScaleUp 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes modalScaleUp {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-accent);
}

.modal-body {
    padding: 24px;
}

.modal-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.form-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-muted);
}

.input-with-toggle {
    display: flex;
    background-color: var(--color-sidebar);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 4px 8px;
}

.input-with-toggle:focus-within {
    border-color: var(--color-border-focus);
}

.input-with-toggle input {
    flex-grow: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--color-text-primary);
    padding: 10px;
    font-family: monospace;
    font-size: 14px;
}

.select-wrapper {
    position: relative;
    width: 100%;
}

select.form-control {
    width: 100%;
    background-color: var(--color-sidebar);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px;
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 14px;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    transition: var(--transition);
}

select.form-control:focus {
    border-color: var(--color-border-focus);
}

.select-wrapper::after {
    content: '▾';
    font-size: 16px;
    color: var(--color-text-muted);
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

.api-status-box {
    background-color: var(--color-sidebar);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}

.status-label {
    color: var(--color-text-secondary);
}

.status-value {
    font-weight: 700;
}

.status-value.configured { color: var(--color-freetalk); }
.status-value.not-configured { color: var(--color-text-muted); }

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* 共通ボタン */
.btn {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--color-accent);
    border: 1px solid var(--color-accent);
    color: var(--color-bg);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-danger {
    background-color: transparent;
    border: 1px solid var(--color-danger);
    color: var(--color-danger);
}

.btn-danger:hover {
    background-color: var(--color-danger);
    color: white;
}

/* 非表示用ヘルパー */
.hidden {
    display: none !important;
}

/* ==========================================================================
   レスポンシブデザイン
   ========================================================================== */

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }
    .notebook-section {
        display: none; 
    }
    .threads-section {
        max-height: 150px;
    }
    .chat-header {
        padding: 0 16px;
    }
    .chat-messages {
        padding: 16px;
    }
    .message {
        max-width: 90%;
    }
}

/* ==========================================================================
   クジラ絵文字（ロゴ・AIアバター）
   ========================================================================== */

.logo-icon {
    font-size: 24px;
    /* 絵文字は元のグラデーション地に乗せる */
}

.message.assistant .avatar {
    font-size: 20px;
}

/* ==========================================================================
   疑問文ドリル
   ========================================================================== */

.drill-view {
    flex: 1;
    overflow-y: auto;
    padding: 28px 32px;
}

.drill-setup {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.drill-picker h3 {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.drill-word-list,
.drill-level-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.drill-word-btn,
.drill-level-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 10px 14px;
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.drill-word-btn:hover:not(:disabled),
.drill-level-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-text-primary);
}

.drill-word-btn.active,
.drill-level-btn.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.drill-word-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.drill-word-btn .zh {
    font-size: 17px;
    font-weight: 700;
}

.drill-word-btn small,
.drill-level-btn small {
    font-size: 10px;
    opacity: 0.7;
}

.drill-word-count {
    font-size: 10px;
    opacity: 0.55;
}

.drill-level-btn {
    min-width: 76px;
    font-size: 15px;
    font-weight: 700;
}

/* お手本カード ------------------------------------------------------------ */

.drill-stage {
    padding-top: 28px;
}

.drill-placeholder {
    color: var(--color-text-muted);
    text-align: center;
    padding: 48px 0;
}

.drill-progress {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 12px;
    color: var(--color-text-muted);
    font-size: 13px;
}

.drill-progress-word {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-accent);
}

.drill-progress-word small {
    font-weight: 400;
    font-size: 12px;
    opacity: 0.8;
}

.drill-card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 32px 28px;
    text-align: center;
    transition: var(--transition);
}

.drill-card.complete {
    border-color: var(--color-accent);
    box-shadow: 0 0 24px rgba(90, 208, 224, 0.18);
}

.drill-target {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: 4px;
    line-height: 1.4;
    margin-bottom: 14px;
}

/* 未入力の文字はくすませ、一致した文字だけ色が乗る */
.drill-target span {
    color: var(--color-text-muted);
    transition: color 0.15s ease;
}

.drill-target span.matched {
    color: var(--color-accent);
}

.drill-target span.punct {
    color: var(--color-text-muted);
    opacity: 0.5;
}

.drill-pinyin {
    font-size: 17px;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

.drill-ja {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

.drill-speak-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-family: inherit;
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
}

.drill-speak-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-text-primary);
}

.drill-speak-btn i {
    width: 15px;
    height: 15px;
}

.drill-actions {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-top: 20px;
}

.btn-ghost {
    background-color: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    border-color: var(--color-primary);
    color: var(--color-text-primary);
}

/* ドリル中はチャット専用UIを隠す（APIを使わないため） */
body.drill-mode .api-warning-banner,
body.drill-mode .header-actions {
    display: none !important;
}

/* 疑問詞ボタンを1行レイアウトにして、出題カードの表示領域を確保する */
.drill-word-btn {
    flex-direction: row;
    align-items: baseline;
    gap: 6px;
    padding: 7px 12px;
}

.drill-word-btn .zh {
    font-size: 15px;
}

.drill-level-btn {
    padding: 6px 12px;
    min-width: 68px;
}

.drill-view {
    padding: 20px 32px;
}

.drill-setup {
    gap: 24px;
    padding-bottom: 18px;
}

.drill-stage {
    padding-top: 20px;
}

.drill-card {
    padding: 26px 24px 22px;
}

.drill-target {
    font-size: 34px;
}

/* サイドバーに出した音声選択 */
.voice-setting {
    margin-bottom: 10px;
}

.voice-setting label {
    display: block;
    font-size: 11px;
    color: var(--color-text-muted);
    margin-bottom: 5px;
}

.voice-setting select.form-control {
    font-size: 12px;
    padding: 9px 28px 9px 12px;
}

/* ハンズフリーのトグル */
.drill-handsfree {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 13px;
    cursor: pointer;
}

.drill-handsfree input {
    accent-color: var(--color-primary);
    width: 15px;
    height: 15px;
    cursor: pointer;
}

.drill-handsfree small {
    display: block;
    font-size: 10px;
    opacity: 0.6;
}

/* 正解時は入力欄も光らせる */
.chat-form.complete,
.chat-form.complete:focus-within {
    border-color: var(--color-accent);
    box-shadow: 0 0 20px rgba(90, 208, 224, 0.28);
}

.chat-form.complete textarea {
    color: var(--color-accent);
}

/* ドリル中はチャット専用のサイドバー項目も隠す */
body.drill-mode .thread-controls,
body.drill-mode .threads-section,
body.drill-mode .notebook-section {
    display: none !important;
}