/* --- 全要素にボックスサイズ計算を適用 --- */
*, *::before, *::after {
    box-sizing: border-box;
}

:root {
    --bg-primary-light: #eff3f6; 
    --bg-secondary-light: #e6eaf0; 
    --text-primary-light: #2c3e50;
    --text-secondary-light: #5a6a7a; 
    --accent-light: #3498db; 
    --shadow-dark-light: #c4c7bf;
    --shadow-light-light: #ffffff; 
    --text-primary-natural: #ffffff; 
    --text-secondary-natural: #e0e0e0;
    --accent-natural: #ffffff;
    --text-primary-gold: #FFFFFF;
    --text-secondary-gold: #F0F0F0;
    --accent-gold: #FFFFFF;
    
    /* チャット画面用のニュートラルカラー */
    --glass-dark: rgba(30, 30, 30, 0.85);
    --glass-light: rgba(255, 255, 255, 0.85);
    --accent-dark: #444;
}

body, html { 
    width: 100%;
    height: 100%; 
    margin: 0; 
    font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif; 
    transition: background 0.5s; 
    
    /* 背景画像の固定設定 */
    background-size: cover !important;           
    background-position: center center !important; 
    background-attachment: fixed !important;     
    background-repeat: no-repeat !important;     
    
    overflow: hidden; 
}

/* --- テーマ設定 --- */
body.natural-theme { 
    --text-primary: var(--text-primary-natural); 
    --text-secondary: var(--text-secondary-natural); 
    --accent: var(--accent-natural); 
}

body.gold-theme { 
    --text-primary: var(--text-primary-gold); 
    --text-secondary: var(--text-secondary-gold); 
    --accent: var(--accent-gold); 
}

body.light-theme { 
    background-color: var(--bg-primary-light); 
    background-image: none; 
    --text-primary: var(--text-primary-light); 
    --text-secondary: var(--text-secondary-light); 
    --accent: var(--accent-light); 
    --shadow-dark: var(--shadow-dark-light); 
    --shadow-light: var(--shadow-light-light); 
}

/* --- コンテナ基本設定 --- */
.pwa-container {
    width: 100%; 
    height: 100%;       
    height: 100dvh;     
    display: none; 
    flex-direction: column; 
    align-items: center;
    padding: 15px;      
    position: absolute; 
    top: 0; 
    left: 0;
    overflow-y: auto;   
    overflow-x: hidden; 
}

.launcher-container { 
    padding-top: 40px; 
    padding-bottom: 20px; 
    justify-content: center; 
}

.light-theme .pwa-container { 
    background: linear-gradient(145deg, var(--bg-primary-light), var(--bg-secondary-light)); 
}

/* --- ボタン・ヘッダー要素 --- */
.settings-button { 
    position: fixed; 
    top: 50px; 
    right: 20px; 
    font-size: 24px; 
    color: var(--text-secondary); 
    cursor: pointer; 
    z-index: 1001; 
}

.launcher-title { 
    color: var(--accent); 
    font-size: 32px; 
    font-weight: 700; 
    margin-bottom: 0px; 
}

.launcher-subtitle { 
    color: var(--text-secondary); 
    font-size: 18px; 
    margin-top: 0px;    
    margin-bottom: 40px; 
}

.button-grid { 
    display: flex; 
    flex-direction: column; 
    gap: 20px; 
    width: 90%; 
    max-width: 320px; 
}

.feature-card { 
    border-radius: 20px; 
    padding: 22px 20px; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    cursor: pointer; 
    transition: all 0.2s; 
}

.light-theme .feature-card { 
    background-color: var(--bg-secondary-light); 
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light); 
}

.natural-theme .feature-card, .gold-theme .feature-card { 
    background: rgba(255, 255, 255, 0.15); 
    backdrop-filter: blur(10px); 
    -webkit-backdrop-filter: blur(10px); 
    border: 1px solid rgba(255, 255, 255, 0.2); 
    box-shadow: 8px 8px 20px rgba(0, 0, 0, 0.2), -8px -8px 20px rgba(255, 255, 255, 0.1); 
}

.feature-card:active { 
    transform: scale(0.98); 
}

.card-icon { 
    font-size: 42px; 
    color: var(--accent); 
    margin-bottom: 8px; 
}

.card-text { 
    font-size: 22px; 
    font-weight: 600; 
    color: var(--text-primary); 
    margin: 0; 
}

.card-subtext { 
    color: var(--text-secondary); 
    font-size: 13px; 
    margin-top: 4px; 
}

/* --- テキストシャドウ設定 --- */
.launcher-title, .launcher-subtitle, .card-text, .card-icon, .card-subtext, .settings-button { 
    text-shadow: none; 
}

.natural-theme .launcher-title, .natural-theme .card-text, .natural-theme .card-icon { 
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5); 
}

.gold-theme .launcher-title, .gold-theme .card-text, .gold-theme .card-icon, .gold-theme .search-title, .gold-theme .card-topic-title, .gold-theme .player-title { 
    text-shadow: 1px 1px 0 #4a2c00, -1px 1px 0 #4a2c00, 1px -1px 0 #4a2c00, -1px -1px 0 #4a2c00, 2px 2px 3px rgba(0,0,0,0.5); 
}

.gold-theme .launcher-subtitle, .gold-theme .card-subtext, .gold-theme .settings-button, .gold-theme .back-button, .gold-theme .no-results, .gold-theme .search-icon { 
    text-shadow: 1px 1px 0px #4a2c00, -1px 1px 0px #4a2c00, 1px -1px 0px #4a2c00, -1px -1px 0px #4a2c00; 
}

.gold-theme #searchInput, .gold-theme #seminarSearchInput { 
    color: var(--text-primary-gold); 
    text-shadow: 1px 1px 1px #4a2c00; 
}

.gold-theme #searchInput::placeholder, .gold-theme #seminarSearchInput::placeholder { 
    color: var(--text-secondary-gold); 
    text-shadow: 1px 1px 1px #4a2c00; 
}

.back-button { 
    padding: 10px 20px; 
    font-size: 16px; 
    color: var(--text-secondary); 
    border: none; 
    border-radius: 10px; 
    cursor: pointer; 
    transition: all 0.1s; 
    margin: 0;
}

.light-theme .back-button { 
    background-color: var(--bg-secondary-light); 
    box-shadow: 3px 3px 6px var(--shadow-dark), -3px -3px 6px var(--shadow-light); 
}

.natural-theme .back-button, .gold-theme .back-button { 
    background: rgba(255, 255, 255, 0.15); 
    backdrop-filter: blur(10px); 
    -webkit-backdrop-filter: blur(10px); 
    border: 1px solid rgba(255, 255, 255, 0.2); 
}

.back-button:active { 
    transform: scale(0.98); 
}

/* --- モーダル (★修正) --- */
.modal { 
    position: fixed; 
    z-index: 1000; 
    left: 0; 
    top: 0; 
    width: 100%; 
    height: 100%; 
    background-color: rgba(0,0,0,0.4); 
    display: none; 
    justify-content: center; 
    align-items: center; 
}

.modal-content { 
    padding: 30px; 
    border-radius: 20px; 
    width: 90%; 
    max-width: 320px; 
    text-align: center; 
    /* ベースはライトテーマ用 */
    background-color: var(--bg-primary-light); 
    color: var(--text-primary);
    
    max-height: 85vh; 
    overflow-y: auto; 
    box-sizing: border-box;
}

/* ライトテーマの明示的指定 */
.light-theme .modal-content {
    background-color: var(--bg-primary-light);
}

/* ★修正: ダーク系テーマ(Gold/Natural)の時は背景を暗くする */
.natural-theme .modal-content, 
.gold-theme .modal-content {
    background-color: rgba(40, 40, 40, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff; /* 文字は白 */
}

.modal-title { 
    font-size: 20px; 
    font-weight: 600; 
    /* color: var(--text-primary); -> 親から継承させるので削除 */
    margin-bottom: 10px;
}

.modal-subtitle { 
    font-size: 14px; 
    color: var(--text-secondary); 
    margin-bottom: 20px; 
}

.theme-preview-container { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 15px; 
    margin-bottom: 20px; 
}

.theme-preview { 
    width: 100%; 
    padding-top: 60%; 
    border-radius: 10px; 
    cursor: pointer; 
    background-size: cover; 
    background-position: center; 
    border: 3px solid transparent; 
    transition: border-color 0.2s; 
}

.theme-preview.selected { 
    border-color: var(--accent); 
}

#preview-1 { background-image: url('/static/images/background-01.jpg'); }
#preview-2 { background-image: url('/static/images/background-02.jpg'); }
#preview-3 { background-image: url('/static/images/background-03.jpg'); }
#preview-4 { background-image: url('/static/images/background-04.jpg'); }
#preview-5 { background-image: url('/static/images/background-05.jpg'); }
#preview-6 { background-image: url('/static/images/background-06.jpg'); }
#preview-7 { background-image: url('/static/images/background-07.jpg'); }
#preview-8 { background-image: url('/static/images/background-08.jpg'); }
#preview-9 { background-image: url('/static/images/background-09.jpg'); }
#preview-10 { background-image: url('/static/images/background-10.jpg'); }

.modal-button { 
    width: 100%; 
    padding: 15px; 
    font-size: 16px; 
    border: none; 
    border-radius: 15px; 
    margin-bottom: 15px; 
    cursor: pointer; 
    color: var(--text-primary); 
}

.light-theme .modal-button { 
    background-color: var(--bg-secondary-light); 
    box-shadow: 3px 3px 6px var(--shadow-dark), -3px -3px 6px var(--shadow-light); 
}

.natural-theme .modal-button, .gold-theme .modal-button { 
    background: rgba(255, 255, 255, 0.1); 
    border: 1px solid rgba(255, 255, 255, 0.15); 
}

/* --- チャット画面 (AIビジネスメンター) --- */
#chatContainer { 
    background-color: transparent;
    padding-top: 10vh !important; 
}

#chatContainer .chat-inner-container { 
    width: 100%; 
    max-width: 800px; 
    height: 90vh !important; 
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15); 
    display: flex; 
    flex-direction: column; 
    overflow: hidden; 
}

@media (min-width: 801px) { 
    #chatContainer .chat-inner-container { 
        height: 85vh !important; 
        max-height: 900px; 
        border-radius: 8px; 
    } 
}

#chatContainer header { 
    background: rgba(40, 40, 40, 0.85);
    backdrop-filter: blur(5px);
    color: white; 
    padding: 10px 15px; 
    font-size: 1.2em; 
    font-weight: bold; 
    text-align: center; 
    flex-shrink: 0; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

#chatContainer .header-back-button { 
    color: white; 
    background: transparent; 
    padding: 8px 12px; 
    font-size: 16px; 
    border-radius: 8px; 
    border: none; 
    cursor: pointer; 
    transition: background-color 0.2s; 
}

#chatContainer .header-back-button:active { 
    background-color: rgba(255,255,255,0.2); 
}

#chatContainer header .title { 
    flex-grow: 1; 
    text-align: center; 
}

#chatContainer .chat-window { 
    flex-grow: 1; 
    padding: 20px; 
    overflow-y: auto; 
    background-color: transparent; 
}

#chatContainer .message { 
    display: flex; 
    flex-direction: column; 
    margin-bottom: 15px; 
}

#chatContainer .message-bubble { 
    padding: 10px 15px; 
    border-radius: 18px; 
    line-height: 1.5; 
    white-space: pre-wrap; 
    max-width: 75%; 
    word-wrap: break-word; 
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

#chatContainer .ai-message { 
    align-items: flex-start; 
}

#chatContainer .ai-message .message-bubble { 
    background-color: rgba(255, 255, 255, 0.9); 
    color: #333; 
    border-top-left-radius: 5px; 
    margin-right: 15px; 
}

#chatContainer .user-message { 
    align-items: flex-end; 
}

#chatContainer .user-message .message-bubble { 
    background-color: rgba(40, 40, 40, 0.85); 
    color: white; 
    border-top-right-radius: 5px; 
    backdrop-filter: blur(5px);
}

/* ★修正: チャットフォームのレイアウト調整 */
#chatContainer .chat-form { 
    display: flex; 
    padding: 6px 8px !important; 
    border-top: 1px solid rgba(0,0,0,0.1); 
    background-color: rgba(255, 255, 255, 0.95); 
    flex-shrink: 0; 
    align-items: flex-end; /* ★修正: ボタンを下揃えにする */
    position: relative; 
    z-index: 100;       
    min-height: auto !important; 
}

/* ★修正: テキストエリアのデザイン */
#chatContainer #message-input { 
    flex-grow: 1; 
    border: 1px solid #ccc; 
    border-radius: 18px; /* 角丸を少し調整 */
    padding: 8px 12px; 
    font-size: 16px; 
    outline: none; 
    
    /* 高さ制御 */
    height: auto;
    min-height: 36px;
    max-height: 120px; /* 5行くらいでスクロールさせる */
    
    resize: none;      /* 右下のツマミを消す */
    overflow-y: auto;  /* 長くなったらスクロール */
    line-height: 1.4;  /* 行間 */
    font-family: inherit;
    background-color: #fff;
}

#chatContainer #send-button { 
    background-color: #444; 
    color: white; 
    border: none; 
    border-radius: 50%; 
    width: 36px; 
    height: 36px; 
    margin-left: 8px; 
    font-size: 18px; 
    cursor: pointer; 
    transition: background-color 0.3s; 
    flex-shrink: 0; 
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    margin-bottom: 2px; /* ★微調整: テキストエリアの下端と合わせる */
}

#chatContainer #send-button:active {
    background-color: #222;
}

#chatContainer .elapsed-time { 
    font-size: 0.75em; 
    color: #555; 
    margin-top: 5px; 
    margin-left: 5px; 
}

/* --- フィードバック、音声コントロール --- */
.feedback-container { 
    display: flex; 
    gap: 5px; 
    margin-top: 5px; 
    justify-content: flex-start;
    align-self: flex-start;
}

.feedback-button { 
    background: none; 
    border: none; 
    font-size: 16px; 
    cursor: pointer; 
    color: #555; 
    transition: color 0.1s; 
    padding: 5px 8px; 
    border-radius: 5px; 
}

.feedback-button:hover { color: #333; }
.feedback-button.active-good { color: #28a745; }
.feedback-button.active-bad { color: #dc3545; }

.feedback-message { 
    font-size: 0.7em; 
    color: #555; 
    margin-top: 5px; 
    text-align: left;
    align-self: flex-start;
}

.chat-audio-controls-container {
    background-color: rgba(240, 240, 240, 0.8);
    border-bottom: 1px solid rgba(0,0,0,0.1);
    flex-shrink: 0;
}

.seminar-player-controls {
    width: 100%;
    background: rgba(255, 255, 255, 0.15); 
    backdrop-filter: blur(5px);
    border-radius: 15px;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.2);
}

.chat-audio-controls {
    display: flex;
    align-items: center;
    padding: 8px 15px;
    gap: 10px;
}

.chat-control-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 120px;
}

.chat-control-btn {
    background-color: #444; 
    color: white;
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-control-btn:hover:not(:disabled) {
    background-color: #222;
}

.chat-control-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.chat-time-display {
    font-size: 11px;
    color: #666;
    white-space: nowrap;
}

.chat-progress-container {
    flex-grow: 1;
    cursor: pointer;
    padding: 5px 0;
}

.chat-progress-bar {
    width: 100%;
    height: 4px;
    background-color: #ddd;
    border-radius: 2px;
    position: relative;
    overflow: hidden;
}

.chat-progress-fill {
    height: 100%;
    background-color: #444; 
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s linear;
}

.chat-control-right {
    display: flex;
    align-items: center;
    gap: 3px;
}

.chat-speed-btn {
    background-color: white;
    border: 1px solid #ddd;
    color: #666;
    padding: 3px 6px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 10px;
    transition: all 0.2s;
}

.chat-speed-btn.active {
    background-color: #444; 
    color: white;
    border-color: #444;
}

.chat-speed-btn:hover:not(.active) {
    background-color: #f5f5f5;
}

@media (max-width: 600px) {
    .chat-audio-controls {
        flex-wrap: wrap;
        gap: 5px;
        padding: 6px 10px;
    }
    
    .chat-control-left {
        min-width: 100px;
    }
    
    .chat-progress-container {
        order: 3;
        width: 100%;
        flex-basis: 100%;
    }
    
    .chat-speed-btn {
        padding: 2px 5px;
        font-size: 9px;
    }
}

/* --- 検索・リスト --- */
.search-header { 
    width: 100%; 
    display: flex; 
    align-items: center; 
    justify-content: flex-start; 
    padding: 20px 0; 
    flex-shrink: 0;
    gap: 15px; 
}
.search-title { 
    color: var(--text-primary); 
    font-size: 26px; 
    font-weight: 700; 
    margin: 0; 
    text-align: left; 
    flex-grow: 1; 
    line-height: 1.2;
}
.search-bar-container { 
    position: relative; 
    width: 100%; 
    max-width: 500px; 
    margin-bottom: 20px; 
    flex-shrink: 0; 
}
.search-icon { 
    position: absolute; 
    top: 50%; 
    left: 20px; 
    transform: translateY(-50%); 
    color: var(--text-secondary); 
    font-size: 18px; 
}
#searchInput, #seminarSearchInput { 
    width: 100%; 
    padding: 15px 20px 15px 50px; 
    font-size: 16px; 
    border: none; 
    border-radius: 30px; 
    color: var(--text-primary); 
    box-sizing: border-box; 
}
.light-theme #searchInput, .light-theme #seminarSearchInput { 
    background-color: var(--bg-secondary-light); 
    box-shadow: inset 5px 5px 10px var(--shadow-dark), inset -5px -5px 10px var(--shadow-light); 
}
.natural-theme #searchInput, .natural-theme #seminarSearchInput,
.gold-theme #searchInput, .gold-theme #seminarSearchInput { 
    background: rgba(255, 255, 255, 0.2); 
    backdrop-filter: blur(5px); 
    -webkit-backdrop-filter: blur(5px); 
    border: 1px solid rgba(255, 255, 255, 0.25); 
}
#searchInput::placeholder, #seminarSearchInput::placeholder { 
    color: var(--text-secondary); 
}
#searchInput:focus, #seminarSearchInput:focus { 
    outline: none; 
}
.gold-theme #searchInput, .gold-theme #seminarSearchInput { 
    color: var(--text-primary-gold); 
    text-shadow: 1px 1px 1px #4a2c00; 
}
.gold-theme #searchInput::placeholder, .gold-theme #seminarSearchInput::placeholder { 
    color: var(--text-secondary-gold); 
    text-shadow: 1px 1px 1px #4a2c00; 
}
.knowledge-list-container { 
    width: 100%; 
    overflow-y: auto; 
    flex-grow: 1; 
    padding: 0 5px; 
    padding-bottom: 30px; 
}
.knowledge-card { 
    border-radius: 15px; 
    padding: 20px; 
    margin-bottom: 15px; 
    transition: all 0.2s ease-in-out; 
}
.light-theme .knowledge-card { 
    background-color: var(--bg-primary-light); 
    box-shadow: 5px 5px 10px var(--shadow-dark), -5px -5px 10px var(--shadow-light); 
}
.natural-theme .knowledge-card, .gold-theme .knowledge-card { 
    background: rgba(255, 255, 255, 0.15); 
    backdrop-filter: blur(10px); 
    -webkit-backdrop-filter: blur(10px); 
    border: 1px solid rgba(255, 255, 255, 0.2); 
}
.card-topic-title { 
    font-size: 26px; 
    font-weight: 700; 
    color: var(--text-primary); 
    margin: 0 0 15px 0; 
    line-height: 1.4; 
}
.card-links { 
    display: flex; 
    gap: 10px; 
}
.card-button { 
    flex: 1; 
    padding: 15px; 
    text-decoration: none; 
    border-radius: 15px; 
    text-align: center; 
    font-weight: 700; 
    font-size: 26px; 
    transition: transform 0.1s, box-shadow 0.2s; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    gap: 10px; 
    margin-top: 10px; 
}
.card-button.video { 
    background-color: #e52d27; 
    color: white; 
}
.card-button.pdf { 
    background-color: #0084ff; 
    color: white; 
}
.card-button.play { 
    background-color: #28a745; 
    color: white; 
    cursor: pointer; 
}
.card-button:active { 
    transform: scale(0.97); 
}
.card-button.disabled {
    background-color: #ccc !important;
    color: #888 !important;
    cursor: not-allowed !important;
    opacity: 0.6;
}
.card-button.disabled:active {
    transform: none !important;
}
.no-results { 
    text-align: center; 
    color: var(--text-secondary); 
    padding-top: 50px; 
}
.seminar-header {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 15px;
}
.seminar-textbook-info {
    display: flex;
    align-items: center;
    padding: 5px 0;
}
.seminar-textbook-link {
    display: block; 
    font-size: 26px; 
    color: #0084ff;
    text-decoration: none;
    padding: 10px 0; 
    line-height: 1.5; 
    transition: opacity 0.2s;
    font-weight: 600; 
}
.seminar-textbook-link:hover {
    opacity: 0.7;
    text-decoration: underline;
}
.seminar-textbook-link i {
    color: #666;
    margin-right: 8px; 
}
.player-container { 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    width: 100%; 
    max-width: 500px; 
    margin: 0 auto; 
    height: auto; 
    min-height: 100%; 
    justify-content: flex-start; 
    padding-bottom: 40px; 
    margin-top: -5vh;
}
.player-avatar { 
    width: 120px; 
    height: 120px; 
    border-radius: 50%; 
    object-fit: cover; 
    margin-bottom: 20px; 
    box-shadow: 0 5px 15px rgba(0,0,0,0.3); 
    border: 3px solid var(--accent); 
}
.player-title { 
    font-size: 22px; 
    font-weight: bold; 
    color: var(--text-primary); 
    text-align: center; 
    margin-bottom: 10px; 
    line-height: 1.3;
}
.player-subtitle { 
    font-size: 14px; 
    color: var(--text-secondary); 
    margin-bottom: 20px; 
}
.visualizer-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 30px;
    margin-bottom: 20px;
}
.viz-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent);
    border-radius: 50%;
    transform: scale(1);
    opacity: 0.3;
}
.visualizer-container.playing .viz-dot {
    animation: pulse 1s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.1s);
}
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.8); opacity: 1; }
}
.subtitle-container {
    width: 100%;
    min-height: 100px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 10px;
    margin-bottom: 20px;
    padding: 15px; 
    box-sizing: border-box; 
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.subtitle-text {
    color: white;
    font-size: 16px;
    font-weight: 500;
    line-height: 1.6;
    margin: 0;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.8);
    word-break: break-word; 
}
.natural-theme .subtitle-container,
.gold-theme .subtitle-container {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.transcript-caption {
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
    margin-bottom: 5px;
    width: 100%;
    text-align: left; 
    padding-left: 5px;
}
.transcript-box {
    width: 100%;
    margin-top: 5px; 
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 20px;
    box-sizing: border-box;
    border: 1px solid rgba(255, 255, 255, 0.2);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-height: 200px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.transcript-content {
    font-size: 15px; 
    line-height: 1.8; 
    color: #ffffff; 
    overflow-y: auto;
    flex-grow: 1;
    white-space: pre-wrap;
    max-height: 300px;
}
.chat-link-btn {
    display: block; 
    width: 100%;
    max-width: 300px;
    padding: 10px 15px;
    margin: 8px 0;
    border: none;
    border-radius: 10px;
    text-align: left;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none; 
    transition: transform 0.1s, box-shadow 0.1s;
    box-sizing: border-box;
    line-height: 1.4;
}
.chat-link-btn:active {
    transform: scale(0.98);
}
.chat-link-btn i {
    margin-right: 8px;
    width: 20px;
    text-align: center;
}
.chat-link-btn.seminar {
    background-color: #fcece0;
    color: #e67e22;
    border: 1px solid #e67e22;
}
.chat-link-btn.audio {
    background-color: #fbecec;
    color: #e74c3c;
    border: 1px solid #e74c3c;
}
.chat-link-btn.pdf {
    background-color: #eaf4fc;
    color: #3498db;
    border: 1px solid #3498db;
}
.message-bubble a {
    color: #0084ff;
    text-decoration: underline;
}
.message-bubble a.chat-link-btn {
    text-decoration: none;
}
.loading-overlay { 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    background: rgba(0,0,0,0.7); 
    display: none; 
    flex-direction: column; 
    justify-content: center; 
    align-items: center; 
    z-index: 2000; 
    color: white; 
}
.spinner { 
    border: 4px solid rgba(255,255,255,0.3); 
    border-radius: 50%; 
    border-top: 4px solid #fff; 
    width: 40px; 
    height: 40px; 
    animation: spin 1s linear infinite; 
    margin-bottom: 15px; 
}
@keyframes spin { 
    0% { transform: rotate(0deg); } 
    100% { transform: rotate(360deg); } 
}