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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

.container {
    width: 100vw;
    height: 100vh;
    padding: 15px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 20px;
    color: white;
    flex-shrink: 0;
    position: relative;
}

.header h1 {
    font-size: 2.2rem;
    margin-bottom: 0;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

/* Top Right Settings */
.top-right-settings {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 1000;
}

.top-right-settings .settings-toggle-btn {
    background: rgba(255, 255, 255, 0.9);
    color: #667eea;
    border: none;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.top-right-settings .settings-toggle-btn:hover {
    background: white;
    transform: rotate(90deg);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.top-right-settings .settings-toggle-btn.active {
    background: #667eea;
    color: white;
    transform: rotate(180deg);
}

.top-right-settings .settings-panel {
    position: absolute;
    top: 55px;
    right: 0;
    background: white;
    border: 2px solid rgba(102, 126, 234, 0.1);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
    min-width: 360px;
    min-height: 200px;
    width: auto !important;
    height: auto !important;
    bottom: auto !important;
}

/* 確保設定面板內容在新位置有正確樣式 */
.top-right-settings .options-section {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.top-right-settings .options-section h3 {
    color: #555;
    margin-bottom: 15px;
    font-size: 1.1rem;
    text-align: center;
}

.top-right-settings .options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    flex: 1;
}

.top-right-settings .option-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 12px 15px;
    border: 2px solid #f0f0f0;
    border-radius: 10px;
    transition: all 0.3s ease;
    position: relative;
    background: white;
    width: 100%;
    box-sizing: border-box;
}

.top-right-settings .option-item:hover {
    border-color: #667eea;
    background-color: #f8f9ff;
}

.top-right-settings .option-item input[type="checkbox"] {
    display: none;
}

.top-right-settings .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #ddd;
    border-radius: 5px;
    margin-right: 10px;
    position: relative;
    transition: all 0.3s ease;
    background: white;
    flex-shrink: 0;
}

.top-right-settings .option-item input[type="checkbox"]:checked + .checkmark {
    background-color: #667eea;
    border-color: #667eea;
}

.top-right-settings .option-item input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 16px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.top-right-settings .option-text {
    font-weight: 500;
    color: #555;
    font-size: 0.9rem;
    flex: 1;
}

.top-right-settings .option-text i {
    margin-right: 8px;
    color: #667eea;
}

.top-right-settings .settings-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    min-height: 200px;
}

/* Main Content - Full viewport layout */
.main-content {
    background: white;
    border-radius: 20px;
    padding: 0;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

/* Main Chat Container */
.main-chat-container {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    margin-bottom: 120px; /* 留出浮動輸入區的空間 */
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.chat-container {
    height: 100%;
    border: 2px solid rgba(102, 126, 234, 0.1);
    border-radius: 15px;
    padding: 25px;
    overflow-y: auto;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.05);
}

.api-key-container label {
    display: block;
    font-weight: 600;
    margin-bottom: 10px;
    color: #555;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group input {
    flex: 1;
    padding: 15px 50px 15px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.toggle-btn {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    padding: 10px;
    border-radius: 6px;
    transition: color 0.3s ease;
}

.toggle-btn:hover {
    color: #667eea;
}

.api-note {
    color: #666;
    font-size: 0.85rem;
    margin-top: 8px;
    display: block;
}

/* Options Section */
.options-section {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.settings-panel .options-section {
    margin-bottom: 0;
}

.options-section h3 {
    color: #555;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
}

.option-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 15px;
    border: 2px solid #f0f0f0;
    border-radius: 12px;
    transition: all 0.3s ease;
    position: relative;
}

.option-item:hover {
    border-color: #667eea;
    background-color: #f8f9ff;
}

.option-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 24px;
    height: 24px;
    border: 2px solid #ddd;
    border-radius: 6px;
    margin-right: 12px;
    position: relative;
    transition: all 0.3s ease;
}

.option-item input[type="checkbox"]:checked + .checkmark {
    background-color: #667eea;
    border-color: #667eea;
}

.option-item input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 16px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.option-text {
    font-weight: 500;
    color: #555;
}

.option-text i {
    margin-right: 8px;
    color: #667eea;
}

/* Disabled options styling */
.option-item input[type="checkbox"]:disabled + .checkmark {
    opacity: 0.5;
    cursor: not-allowed;
}

.option-item input[type="checkbox"]:disabled ~ .option-text {
    opacity: 0.5;
    cursor: not-allowed;
}

.option-item:has(input[type="checkbox"]:disabled) {
    cursor: not-allowed;
}

/* Chat Section - New Layout */
.main-chat-area .chat-section {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: transparent;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    border: none;
}

/* Chat Container - Updated */
.main-chat-area .chat-container {
    flex: 1;
    border: 2px solid rgba(102, 126, 234, 0.1);
    border-radius: 15px;
    padding: 30px 20px;
    overflow-y: auto;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.05);
    min-height: 300px;
    max-height: calc(100vh - 500px);
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

/* Quick Questions - Moved Below Chat */
.main-chat-area .quick-questions {
    margin-bottom: 20px;
    padding: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
    border-radius: 12px;
    border: 2px solid rgba(102, 126, 234, 0.1);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.05);
}

.main-chat-area .quick-questions h4 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.main-chat-area .quick-questions h4 i {
    color: #667eea;
}

.main-chat-area .question-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}

.main-chat-area .question-btn {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: 10px;
    padding: 12px 15px;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    color: #333;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.05);
}

.main-chat-area .question-btn:hover {
    border-color: #667eea;
    background: linear-gradient(135deg, #f0f4ff 0%, #e6ecff 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

.main-chat-area .question-btn i {
    color: #667eea;
    font-size: 1rem;
    width: 16px;
    text-align: center;
}

.welcome-message {
    text-align: center;
    padding: 50px 20px;
    color: #666;
}

.welcome-message i {
    font-size: 3.5rem;
    color: #667eea;
    margin-bottom: 25px;
    opacity: 0.8;
}

.welcome-message h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.5rem;
    font-weight: 600;
}

.welcome-message p {
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 500px;
    margin: 0 auto;
}

/* Message Styles */
.message {
    margin-bottom: 20px;
    padding: 15px;
    border-radius: 12px;
    max-width: 85%;
    position: relative;
}

.user-message {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 4px;
}

.ai-message {
    background: white;
    border: 2px solid #f0f0f0;
    margin-right: 0;
    max-width: 100%;
    border-bottom-left-radius: 4px;
}

.message-header {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    font-weight: 600;
}

.message-header i {
    margin-right: 8px;
}

.message-content {
    line-height: 1.6;
}

.thinking-process {
    background: linear-gradient(135deg, #f0f4ff 0%, #f8f9ff 100%);
    border: 1px solid rgba(102, 126, 234, 0.15);
    border-radius: 10px;
    padding: 12px 15px;
    margin: 0 0 15px 0;
    order: -1;
    font-size: 0.85rem;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.05);
}

.thinking-process h4 {
    color: #667eea;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 600;
}

.thinking-process h4 i {
    margin-right: 6px;
    font-size: 0.8rem;
}

.thinking-content {
    background: rgba(102, 126, 234, 0.03);
    border-left: 3px solid #667eea;
    padding: 10px 12px;
    margin: 0;
    border-radius: 0 6px 6px 0;
    color: #666;
    line-height: 1.5;
    font-size: 0.8rem;
}

.thinking-content p {
    margin-bottom: 8px;
}

.thinking-content strong {
    color: #667eea;
    font-weight: 600;
}

.references {
    background: #f8f9ff;
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 10px;
    padding: 8px;
    margin: 8px 0;
}

.references h4 {
    color: #667eea;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    font-size: 0.8rem;
    font-weight: 600;
}

.references h4 i {
    margin-right: 4px;
    font-size: 0.7rem;
}

.reference-item {
    display: inline-block;
    margin: 2px 4px 2px 0;
    padding: 4px 8px;
    background: white;
    border-radius: 12px;
    border: 1px solid rgba(102, 126, 234, 0.2);
    transition: all 0.3s ease;
    font-size: 0.7rem;
    max-width: 160px;
    vertical-align: top;
}

.reference-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
    border-color: #667eea;
}

.reference-item.highlight {
    background: #e6ecff;
    border-color: #667eea;
    animation: highlightPulse 2s ease-in-out;
}

.reference-number {
    display: inline-block;
    background: #667eea;
    color: white;
    font-size: 0.6rem;
    font-weight: bold;
    padding: 1px 4px;
    border-radius: 6px;
    margin-right: 4px;
    min-width: 14px;
    text-align: center;
    line-height: 1;
}

.reference-link {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    display: inline-block;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reference-link:hover {
    color: #667eea;
}

.reference-text {
    color: #555;
    font-weight: 500;
    display: inline-block;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reference-snippet {
    display: none; /* 隱藏片段以保持簡潔 */
}

/* 字元計數樣式 */
.character-count {
    text-align: right;
    margin-top: 10px;
    font-size: 0.9rem;
    color: #888;
    padding-right: 5px;
}

.character-count span {
    font-weight: 600;
    transition: color 0.3s ease;
}

/* 引用連結樣式 */
.citation-link {
    color: #667eea;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.75em;
    margin: 0 1px;
    padding: 1px 3px;
    border-radius: 3px;
    background: rgba(102, 126, 234, 0.1);
    transition: all 0.2s ease;
    display: inline-block;
}

.citation-link:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: scale(1.1);
    text-decoration: underline;
}

/* 上標樣式 */
sup {
    vertical-align: super;
    font-size: 0.8em;
    line-height: 0;
}

/* 參考資料區塊樣式優化 */
.footnotes {
    margin-top: 20px;
    padding: 20px;
    background: linear-gradient(145deg, #f8f9ff, #e8f2ff);
    border-radius: 12px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.footnotes h4 {
    color: #667eea;
    font-size: 1.1rem;
    margin-bottom: 15px;
    border-bottom: 2px solid rgba(102, 126, 234, 0.3);
    padding-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footnote-item {
    margin-bottom: 12px;
    padding: 10px;
    background: white;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    transition: all 0.3s ease;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.footnote-item:hover {
    transform: translateX(5px);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.footnote-item.highlight {
    background: #fff5d6;
    border-left-color: #ffb347;
    animation: highlightPulse 2s ease-in-out;
}

@keyframes highlightPulse {
    0%, 100% { background: #fff5d6; }
    50% { background: #ffe4b3; }
}

.footnote-number {
    color: #667eea;
    font-weight: bold;
    font-size: 0.9rem;
    min-width: 25px;
    text-align: center;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 50%;
    padding: 4px;
    margin-right: 5px;
}

.footnote-item a {
    color: #333;
    text-decoration: none;
    flex: 1;
    line-height: 1.4;
    transition: color 0.2s ease;
}

.footnote-item a:hover {
    color: #667eea;
    text-decoration: underline;
}

/* 搜尋查詢區塊樣式優化 */
.search-queries {
    margin-top: 20px;
    padding: 15px;
    background: linear-gradient(145deg, #f0f8ff, #e6f3ff);
    border-radius: 10px;
    border: 1px solid rgba(0, 123, 255, 0.2);
}

.search-queries h4 {
    color: #0066cc;
    font-size: 1rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-query {
    display: inline-block;
    background: #007bff;
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    margin: 3px;
    font-weight: 500;
}

/* 載入中動畫 */
/* 響應式設計 - Updated for Floating Settings */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .main-content {
        border-radius: 15px;
    }
    
    .main-chat-container {
        padding: 15px;
        margin-bottom: 140px;
    }
    
    .floating-input-area {
        width: calc(100% - 20px);
        bottom: 10px;
    }
    
    .floating-input-container {
        padding: 15px;
        border-radius: 15px;
    }
    
    .question-buttons {
        gap: 6px;
    }
    
    .question-btn-compact {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .bottom-right-settings {
        bottom: 10px;
        right: 10px;
    }
    
    .settings-panel {
        width: 280px;
        bottom: 65px;
        right: -10px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 5px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .main-chat-container {
        padding: 10px;
    }
    
    .floating-input-container {
        padding: 12px;
    }
    
    .question-btn-compact {
        padding: 4px 8px;
        font-size: 11px;
    }
    
    .settings-panel {
        width: 250px;
        right: -15px;
    }
    
    .input-container {
        padding: 10px 12px;
    }
    
    .send-btn {
        width: 35px;
        height: 35px;
    }
}

/* Welcome Message */
.welcome-message {
    text-align: center;
    padding: 60px 20px;
    color: #666;
}

.welcome-message i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 20px;
}

.welcome-message h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.welcome-message p {
    font-size: 1rem;
    line-height: 1.6;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    text-align: center;
    color: white;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 輸入區域樣式 - New Sidebar Layout */
.main-chat-area .input-section {
    margin-top: 0;
    background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid rgba(102, 126, 234, 0.1);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.05);
}

.main-chat-area .input-container {
    display: flex;
    gap: 15px;
    align-items: flex-end;
}

.main-chat-area .input-container textarea {
    flex: 1;
    padding: 18px;
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: 15px;
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    min-height: 50px;
    max-height: 300px;
    height: 50px;
    overflow-y: auto;
    transition: all 0.3s ease;
    line-height: 1.5;
    background: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.05);
    box-sizing: border-box;
}

.main-chat-area .input-container textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1), 0 4px 15px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.main-chat-area .input-container textarea::placeholder {
    color: #aaa;
}

.main-chat-area .send-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 15px;
    padding: 18px 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 120px;
    white-space: nowrap;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.main-chat-area .send-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.main-chat-area .send-btn:disabled {
    background: linear-gradient(135deg, #ccc 0%, #bbb 100%);
    cursor: not-allowed;
    transform: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.main-chat-area .send-btn i {
    font-size: 1rem;
}

/* 字元計數樣式 - Sidebar Layout */
.main-chat-area .character-count {
    text-align: right;
    margin-top: 10px;
    font-size: 0.9rem;
    color: #888;
}

.question-btn-compact i {
    color: #667eea;
    font-size: 0.9rem;
}

/* Input Section - Fixed Bottom */
.fixed-bottom-area .input-section {
    margin: 0;
    background: transparent;
    border: none;
    padding: 0;
    box-shadow: none;
}

.fixed-bottom-area .input-container {
    display: flex;
    gap: 12px;
    align-items: center;
}

.fixed-bottom-area .input-container textarea {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: 25px;
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    height: 45px;
    min-height: 45px;
    max-height: 45px;
    transition: all 0.3s ease;
    line-height: 1.4;
    background: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.05);
    overflow-y: hidden;
}



/* Floating Input Area - Similar to the attached image */
.floating-input-area {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 40px);
    max-width: 1400px;
    z-index: 1000;
}

.floating-input-container {
    background: rgba(102, 126, 234, 0.15);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-container {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 12px 16px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.input-container textarea {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: #333;
    font-size: 16px;
    resize: none;
    height: 24px;
    min-height: 24px;
    max-height: 120px;
    font-family: inherit;
    line-height: 1.2;
}

.input-container textarea::placeholder {
    color: rgba(102, 126, 234, 0.6);
}

.send-btn {
    background: #667eea;
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
    opacity: 1;
}

.send-btn:hover {
    background: #5a67d8;
    transform: scale(1.05);
}

.send-btn:disabled {
    background: rgba(102, 126, 234, 0.5);
    cursor: not-allowed;
    transform: none;
}

.character-count {
    text-align: right;
    color: rgba(102, 126, 234, 0.7);
    font-size: 12px;
    margin-top: 4px;
}

/* Quick Questions - Compact version above input */
.quick-questions-compact {
    margin-bottom: 12px;
}

.question-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.question-btn-compact {
    background: rgba(255, 255, 255, 0.8);
    color: #667eea;
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    white-space: nowrap;
}

.question-btn-compact:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: #667eea;
    transform: translateY(-2px);
}

.question-btn-compact i {
    margin-right: 6px;
}

/* Bottom Right Settings */
.bottom-right-settings {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1001;
}

.settings-toggle-btn {
    width: 50px;
    height: 50px;
    background: rgba(102, 126, 234, 0.2);
    backdrop-filter: blur(20px);
    color: #667eea;
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.2);
}

.settings-toggle-btn:hover {
    background: rgba(102, 126, 234, 0.3);
    transform: scale(1.1);
}

.settings-toggle-btn.active {
    background: #667eea;
    color: white;
    transform: rotate(45deg);
}

.settings-panel {
    position: absolute;
    bottom: 60px;
    right: 0;
    width: 320px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.settings-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Settings Panel Content */
.api-section {
    margin-bottom: 20px;
}

.api-key-container label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
    font-size: 14px;
}

.api-key-container {
    margin-bottom: 20px;
}

.api-key-container:last-of-type {
    margin-bottom: 10px;
}

.api-note {
    display: block;
    margin-top: 10px;
    padding: 10px 12px;
    background: rgba(76, 175, 80, 0.1);
    border: 1px solid rgba(76, 175, 80, 0.2);
    border-radius: 8px;
    font-size: 12px;
    color: #2e7d32;
    line-height: 1.4;
}

.api-note i {
    color: #4caf50;
    margin-right: 6px;
}

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

.input-group input {
    flex: 1;
    padding: 10px 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
}

.toggle-btn {
    background: transparent;
    border: 2px solid #e2e8f0;
    color: #666;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.toggle-btn:hover {
    border-color: #667eea;
    color: #667eea;
}

.api-note {
    color: #888;
    font-size: 12px;
    margin-top: 6px;
    display: block;
}

.options-section h3 {
    color: #555;
    margin-bottom: 15px;
    font-size: 14px;
    font-weight: 600;
}

.options-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 10px 12px;
    border: 1px solid rgba(102, 126, 234, 0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
    background: white;
}

.option-item:hover {
    border-color: #667eea;
    background-color: #f8f9ff;
}

.option-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid #ddd;
    background-color: white;
    border-radius: 4px;
    margin-right: 12px;
    position: relative;
    transition: all 0.3s ease;
}

.option-item input[type="checkbox"]:checked + .checkmark {
    background-color: #667eea;
    border-color: #667eea;
}

.option-item input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 14px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.option-text {
    font-weight: 500;
    color: #555;
    font-size: 14px;
}

/* API Key 設定區域 */
.api-key-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.api-key-section h3 {
    color: #374151;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 600;
}

.api-key-section h3 i {
    margin-right: 8px;
    color: #667eea;
}

.gemini-api-key {
    margin-bottom: 15px;
}

.gemini-api-key label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #374151;
    font-size: 0.85rem;
}

.api-key-input-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.api-key-input-container input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.85rem;
    font-family: 'Courier New', monospace;
    background: #f9fafb;
    transition: all 0.2s ease;
}

.api-key-input-container input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.toggle-btn {
    padding: 10px;
    border: 1px solid #d1d5db;
    background: #f9fafb;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #6b7280;
}

.toggle-btn:hover {
    background: #e5e7eb;
    color: #374151;
}

.api-key-help {
    display: block;
    margin-top: 8px;
    font-size: 0.75rem;
    color: #6b7280;
    line-height: 1.4;
}

.api-key-help i {
    margin-right: 4px;
    color: #3b82f6;
}

.api-key-help a {
    color: #3b82f6;
    text-decoration: none;
}

.api-key-help a:hover {
    text-decoration: underline;
}

/* 模型資訊區域 */
.model-info-section {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.model-info-section h3 {
    color: #374151;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 600;
}

.model-info-section h3 i {
    margin-right: 8px;
    color: #667eea;
}

.model-description {
    background: linear-gradient(135deg, #f0f4ff 0%, #f8f9ff 100%);
    border: 1px solid rgba(102, 126, 234, 0.15);
    border-radius: 8px;
    padding: 15px;
}

.model-name {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.model-name i {
    margin-right: 8px;
    color: #667eea;
}

.model-features {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.feature-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 8px;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 12px;
    font-size: 0.75rem;
    color: #667eea;
    font-weight: 500;
}

.feature-tag i {
    margin-right: 4px;
    font-size: 0.7rem;
}

.option-text i {
    margin-right: 8px;
    color: #667eea;
}

/* API Key Container */

/* API Key 動態顯示 */
.api-key-container.hidden {
    display: none;
}

.api-key-container {
    transition: all 0.3s ease;
}

/* 新的思考流程和引用來源樣式 */
.thinking-section, .references-section, .response-section {
    margin: 15px 0;
    border-radius: 10px;
    overflow: hidden;
}

.thinking-section {
    background: linear-gradient(135deg, #f0f4ff 0%, #f8f9ff 100%);
    border: 1px solid rgba(102, 126, 234, 0.15);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.05);
}

.references-section {
    background: linear-gradient(135deg, #f0fff4 0%, #f8fff9 100%);
    border: 1px solid rgba(34, 197, 94, 0.15);
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.05);
}

.response-section {
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.thinking-header, .references-header, .response-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 15px;
    font-weight: 600;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.thinking-header {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
}

.references-header {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.response-header {
    background: rgba(0, 0, 0, 0.02);
    color: #374151;
}

.thinking-header i, .references-header i, .response-header i {
    margin-right: 8px;
}

.thinking-content, .references-content, .response-content {
    padding: 15px;
    line-height: 1.6;
}

.thinking-content {
    background: rgba(102, 126, 234, 0.03);
    font-size: 0.9rem;
    color: #4b5563;
}

.references-content {
    background: rgba(34, 197, 94, 0.03);
}

.response-content {
    background: #ffffff;
    color: #374151;
}

/* Footnote styles */
.footnote-ref {
    color: #3b82f6;
    font-size: 0.8em;
    text-decoration: none;
    margin-left: 2px;
    cursor: pointer;
    transition: color 0.2s ease;
}

.footnote-ref:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

.toggle-thinking, .toggle-references {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.toggle-thinking:hover, .toggle-references:hover {
    background: rgba(255, 255, 255, 0.2);
}

.thinking-section.collapsed .thinking-content,
.references-section.collapsed .references-content {
    display: none;
}

.thinking-section.collapsed .toggle-thinking i,
.references-section.collapsed .toggle-references i {
    transform: rotate(180deg);
}

.references-content {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.reference-item {
    display: flex;
    align-items: flex-start;
    padding: 4px 6px;
    background: white;
    border-radius: 6px;
    border: 1px solid rgba(34, 197, 94, 0.1);
    transition: all 0.2s ease;
    flex: 0 1 auto;
    max-width: 250px;
    margin-bottom: 0;
    scroll-margin-top: 80px; /* For smooth scrolling to target */
}

.reference-item:hover {
    border-color: rgba(34, 197, 94, 0.3);
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.1);
}

.reference-item.highlight {
    border-color: rgba(34, 197, 94, 0.6);
    box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2);
    background: rgba(34, 197, 94, 0.05);
}

.reference-number {
    background: #22c55e;
    color: white;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    font-weight: 600;
    margin-right: 6px;
    flex-shrink: 0;
}

.reference-details {
    flex: 1;
    min-width: 0; /* Allow text to shrink */
}

.reference-details a {
    color: #22c55e;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.7rem;
    line-height: 1.2;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reference-details a:hover {
    text-decoration: underline;
}

.reference-snippet {
    margin-top: 2px;
    font-size: 0.6rem;
    color: #6b7280;
    line-height: 1.2;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 大量引用來源的特殊樣式 */
.references-section.large-reference-set {
    background: linear-gradient(135deg, #f0f9ff 0%, #f8fafc 100%);
    border: 1px solid rgba(59, 130, 246, 0.15);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.05);
}

.references-section.large-reference-set .references-header {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

.references-section.large-reference-set .references-content {
    background: rgba(59, 130, 246, 0.03);
}

.reference-count {
    font-size: 0.8rem;
    color: #6b7280;
    font-weight: 400;
    margin-left: 8px;
}

.large-reference-notice {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 15px;
    color: #1e40af;
}

.large-reference-notice p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.4;
}

.large-reference-notice p:first-child {
    font-weight: 600;
    margin-bottom: 6px;
}

.large-reference-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 8px;
}

.reference-item.compact {
    background: white;
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: 6px;
    padding: 8px;
    transition: all 0.2s ease;
    max-width: none;
}

.reference-item.compact:hover {
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
}

.reference-item.compact .reference-number {
    background: #3b82f6;
    width: 18px;
    height: 18px;
    font-size: 0.7rem;
}

.reference-item.compact .reference-details a {
    color: #3b82f6;
    font-size: 0.8rem;
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.reference-domain {
    font-size: 0.65rem;
    color: #9ca3af;
    margin-top: 2px;
    font-style: italic;
}

/* 響應式設計調整 */
@media (max-width: 768px) {
    .large-reference-list {
        grid-template-columns: 1fr;
    }
    
    .reference-item.compact {
        min-width: 0;
    }
}