/* 全局样式 */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --border-radius: 12px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

/* 导航栏样式 */
.navbar {
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    background: rgba(13, 110, 253, 0.95) !important;
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.3rem;
}

/* 欢迎卡片 */
.welcome-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.welcome-card h1 {
    color: var(--primary-color);
    font-weight: 700;
}

/* 对话容器 */
.chat-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
}

/* 对话历史 */
.chat-history {
    max-height: 500px;
    overflow-y: auto;
    padding: 1.5rem;
    background: var(--light-color);
    resize: vertical;
}

.chat-history::-webkit-scrollbar {
    width: 6px;
}

.chat-history::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.chat-history::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 3px;
}

.chat-history::-webkit-scrollbar-thumb:hover {
    background: #0b5ed7;
}

/* 消息样式 */
.message {
    display: flex;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.5s ease;
}

.message:last-child {
    margin-bottom: 0;
}

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

.ai-message {
    flex-direction: row;
}

/* 流式输出样式 */
.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background-color: var(--primary-color);
    animation: blink 1s infinite;
    margin-left: 2px;
    vertical-align: text-bottom;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* 流式消息实时更新效果 */
.message-text {
    transition: all 0.1s ease;
}

.ai-message .message-text {
    position: relative;
}

/* 优化流式输出的显示 */
.ai-message .message-content {
    max-width: 80%;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 1rem;
    flex-shrink: 0;
    font-size: 1.2rem;
}

.user-message .message-avatar {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
}

.ai-message .message-avatar {
    background: linear-gradient(135deg, #28a745, #1e7e34);
    color: white;
}

/* 消息内容样式 */
.message-content {
    max-width: 100%;
    overflow: hidden;
    word-break: break-word;
}

.ai-message .message-content {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 4px solid #28a745;
    padding: 20px;
    margin: 10px 0;
    border-radius: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.user-message .message-content {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    padding: 15px 20px;
    margin: 10px 0;
    border-radius: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 消息文本样式 - 统一版本 */
.message-text {
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.6;
    max-width: 100%;
    font-size: 1rem;
    margin-bottom: 0.5rem;
    text-align: justify;
    hyphens: auto;
}

.message-translation {
    font-size: 0.9rem;
    opacity: 0.8;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding-top: 0.5rem;
    margin-top: 0.5rem;
}

.user-message .message-translation {
    border-top-color: rgba(255, 255, 255, 0.3);
}

/* 输入区域 */
.chat-input-container {
    padding: 1.5rem;
    background: white;
    border-top: 1px solid #dee2e6;
}

.input-group {
    margin-bottom: 0.5rem;
}

.form-control {
    border-radius: var(--border-radius);
    border: 2px solid #e9ecef;
    transition: var(--transition);
    resize: none;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.btn {
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: #0b5ed7;
    border-color: #0b5ed7;
    transform: translateY(-2px);
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* 功能按钮 */
.btn-outline-secondary {
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-outline-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* 加载指示器 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.loading-content {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
}

/* 聊天区域 */
.chat-area {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    overflow: hidden;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .message {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .user-message {
        align-items: flex-end;
    }
    
    .message-avatar {
        margin: 0.5rem 0;
    }
    
    .message-content {
        margin: 0.5rem 0;
    }
    
    .welcome-card {
        padding: 1rem;
    }
    
    .chat-input-container {
        padding: 1rem;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #0b5ed7;
}

/* 工具提示样式 */
.tooltip {
    font-size: 0.875rem;
}

/* 状态指示器 */
.status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.status-online {
    background: var(--success-color);
}

.status-offline {
    background: var(--danger-color);
}

/* 错误消息样式 */
.error-message {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-radius: var(--border-radius);
    padding: 0.75rem;
    margin: 1rem 0;
}

/* 成功消息样式 */
.success-message {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    border-radius: var(--border-radius);
    padding: 0.75rem;
    margin: 1rem 0;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-controls .btn {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
}

#translationToggle {
    transition: all 0.3s ease;
}

#translationToggle.btn-outline-warning {
    background-color: #ffc107;
    border-color: #ffc107;
    color: #000;
}

#translationToggle.btn-outline-warning:hover {
    background-color: #e0a800;
    border-color: #d39e00;
    color: #000;
}

.search-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.zoom-controls .btn-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-weight: bold;
    min-width: 20px;
    text-align: center;
}

.zoom-controls .btn-link:hover {
    color: white;
}

.zoom-controls .separator {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.75rem;
}

/* 作文模式按钮样式 */
#essayModeToggle.active {
    background-color: #28a745;
    border-color: #28a745;
    color: white;
}

#essayModeToggle.active:hover {
    background-color: #218838;
    border-color: #1e7e34;
}

/* 作文模式下的消息样式 */
.essay-mode .ai-message .message-content {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 4px solid #28a745;
    padding: 20px;
    margin: 10px 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.essay-mode .ai-message .message-text {
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.8;
    text-align: justify;
    text-indent: 2em;
}

/* 作文提示框样式 */
.essay-prompt {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    border: 1px solid #c3e6cb;
    border-radius: 8px;
    padding: 15px;
    margin: 10px 0;
    font-style: italic;
    color: #155724;
}

.essay-prompt::before {
    content: "✍️ 作文模式已激活 - ";
    font-weight: bold;
}

/* AI思考指示器 - 在聊天区域显示 */
.thinking-indicator {
    display: flex !important;
    align-items: center !important;
    justify-content: flex-start !important;
    padding: 15px 20px !important;
    margin: 10px 0 !important;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%) !important;
    border-radius: 15px !important;
    border-left: 4px solid #007bff !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1) !important;
    animation: thinking-pulse 1.5s ease-in-out infinite !important;
    position: relative !important;
    z-index: 100 !important;
}

.thinking-indicator .avatar {
    width: 40px !important;
    height: 40px !important;
    border-radius: 50% !important;
    background: linear-gradient(135deg, #007bff, #0056b3) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    margin-right: 15px !important;
    flex-shrink: 0 !important;
}

.thinking-indicator .avatar i {
    color: white !important;
    font-size: 18px !important;
}

.thinking-indicator .content {
    flex: 1 !important;
    display: flex !important;
    align-items: center !important;
}

.thinking-indicator .text {
    color: #6c757d !important;
    font-size: 14px !important;
    margin-right: 15px !important;
}

.thinking-indicator .dots {
    display: flex !important;
    align-items: center !important;
    gap: 4px !important;
}

.thinking-indicator .dot {
    width: 8px !important;
    height: 8px !important;
    border-radius: 50% !important;
    background: #007bff !important;
    animation: dot-bounce 1.4s ease-in-out infinite both !important;
}

.thinking-indicator .dot:nth-child(1) { animation-delay: -0.32s !important; }
.thinking-indicator .dot:nth-child(2) { animation-delay: -0.16s !important; }
.thinking-indicator .dot:nth-child(3) { animation-delay: 0s !important; }

/* 思考指示器动画 */
@keyframes thinking-pulse {
    0%, 100% { opacity: 1; transform: translateY(0); }
    50% { opacity: 0.8; transform: translateY(-2px); }
}

@keyframes dot-bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* 隐藏全屏加载指示器 */
#loadingIndicator {
    display: none !important;
}

/* 模态框样式 */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow);
}

.modal-header {
    border-bottom: 1px solid #dee2e6;
    background: var(--light-color);
}

.modal-footer {
    border-top: 1px solid #dee2e6;
    background: var(--light-color);
}

/* 统计卡片 */
.stats-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.stats-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stats-label {
    color: var(--secondary-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 帮助内容 */
.help-content {
    line-height: 1.8;
}

.help-content h5 {
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.help-content ul {
    padding-left: 1.5rem;
}

.help-content li {
    margin-bottom: 0.5rem;
}

/* 主题切换 */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* 深色主题 */
[data-theme="dark"] {
    --light-color: #343a40;
    --dark-color: #f8f9fa;
}

[data-theme="dark"] body {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
}

[data-theme="dark"] .welcome-card,
[data-theme="dark"] .chat-area,
[data-theme="dark"] .chat-input-container {
    background: rgba(52, 58, 64, 0.95);
    color: #f8f9fa;
}

[data-theme="dark"] .form-control {
    background: #495057;
    border-color: #6c757d;
    color: #f8f9fa;
}

[data-theme="dark"] .form-control:focus {
    background: #495057;
    color: #f8f9fa;
}

/* 字体大小控制 */
.font-small {
    font-size: 0.875rem;
}

.font-medium {
    font-size: 1rem;
}

.font-large {
    font-size: 1.125rem;
}

.font-xlarge {
    font-size: 1.25rem;
}

/* 无障碍功能 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000080;
        --secondary-color: #000000;
        --border-radius: 2px;
    }
    
    .btn {
        border-width: 2px;
    }
    
    .form-control {
        border-width: 2px;
    }
}

/* 减少动画模式 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 复制按钮微调 */
.message-content .btn.btn-outline-secondary {
	padding: 0.2rem 0.5rem;
	font-size: 0.8rem;
}