/**
 * Chat Mode Styles
 * 
 * 聊天模式的完整样式定义，包括：
 * - 聊天容器布局
 * - 消息样式（用户/AI差异化）
 * - 输入区域样式
 * - 移动端适配
 * - 深色模式支持
 * - 无障碍访问支持
 */

/* ==========================================================================
   聊天模式容器
   ========================================================================== */

.chat-mode-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 80vh;
    background: var(--bg-color, #ffffff);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: all 0.3s ease;
}

.chat-mode-container.mobile-layout {
    max-height: 100vh;
    border-radius: 0;
    box-shadow: none;
}

/* ==========================================================================
   聊天头部
   ========================================================================== */

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: var(--primary-color, #2196f3);
    color: white;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.chat-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 16px;
}

.chat-icon {
    font-size: 20px;
}

.chat-controls {
    display: flex;
    gap: 8px;
}

.chat-control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

.chat-control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.chat-control-btn:active {
    transform: translateY(0);
}

.chat-control-btn .material-icons {
    font-size: 18px;
}

/* ==========================================================================
   消息区域
   ========================================================================== */

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: var(--chat-bg, #f8f9fa);
    scroll-behavior: smooth;
}

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

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   欢迎消息
   ========================================================================== */

.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary, #666);
}

.welcome-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.8;
}

.welcome-text h3 {
    margin: 0 0 8px 0;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary, #333);
}

.welcome-text p {
    margin: 0;
    font-size: 14px;
    line-height: 1.5;
    max-width: 400px;
}

/* ==========================================================================
   聊天消息
   ========================================================================== */

.chat-message {
    display: flex;
    margin-bottom: 20px;
    animation: messageSlideIn 0.3s ease-out;
}

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

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

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

.message-avatar {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin: 0 12px;
    flex-shrink: 0;
}

.user-message .message-avatar {
    background: var(--user-color, #4caf50);
}

.ai-message .message-avatar {
    background: var(--ai-color, #2196f3);
}

.avatar-icon {
    font-size: 20px;
    line-height: 40px;
    color: white;
}

.message-content {
    flex: 1;
    max-width: calc(100% - 64px);
    position: relative;
}

.user-message .message-content {
    text-align: right;
}

.ai-message .message-content {
    text-align: left;
}

/* ==========================================================================
   消息气泡
   ========================================================================== */

.message-text {
    display: inline-block;
    padding: 12px 16px;
    border-radius: 18px;
    font-size: 14px;
    line-height: 1.5;
    word-wrap: break-word;
    max-width: 100%;
    position: relative;
}

.user-message .message-text {
    background: var(--user-bubble, #4caf50);
    color: white;
    border-bottom-right-radius: 6px;
}

.ai-message .message-text {
    background: var(--ai-bubble, #ffffff);
    color: var(--text-primary, #333);
    border: 1px solid var(--border-color, #e0e0e0);
    border-bottom-left-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* ==========================================================================
   消息时间和操作
   ========================================================================== */

.message-time {
    font-size: 12px;
    color: var(--text-tertiary, #999);
    margin-top: 4px;
    opacity: 0.7;
}

.user-message .message-time {
    text-align: right;
}

.ai-message .message-time {
    text-align: left;
}

.message-actions {
    display: flex;
    gap: 4px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.chat-message:hover .message-actions {
    opacity: 1;
}

.user-message .message-actions {
    justify-content: flex-end;
}

.ai-message .message-actions {
    justify-content: flex-start;
}

.message-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--action-btn-bg, #f5f5f5);
    border: none;
    border-radius: 6px;
    color: var(--text-secondary, #666);
    cursor: pointer;
    transition: all 0.2s ease;
}

.message-action-btn:hover {
    background: var(--action-btn-hover, #e0e0e0);
    color: var(--text-primary, #333);
}

.message-action-btn .material-icons {
    font-size: 16px;
}

/* ==========================================================================
   输入区域
   ========================================================================== */

.chat-input-area {
    padding: 16px 20px;
    background: var(--input-area-bg, #ffffff);
    border-top: 1px solid var(--border-color, #e0e0e0);
}

.chat-input-container {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--input-bg, #f8f9fa);
    border: 2px solid var(--input-border, #e0e0e0);
    border-radius: 24px;
    padding: 8px 16px;
    transition: all 0.2s ease;
}

.chat-input-container:focus-within {
    border-color: var(--primary-color, #2196f3);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary, #333);
    resize: none;
    min-height: 20px;
    max-height: 120px;
    font-family: inherit;
}

.chat-input::placeholder {
    color: var(--text-tertiary, #999);
}

.chat-send-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--primary-color, #2196f3);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.chat-send-btn:hover {
    background: var(--primary-dark, #1976d2);
    transform: scale(1.05);
}

.chat-send-btn:active {
    transform: scale(0.95);
}

.chat-send-btn:disabled {
    background: var(--disabled-color, #ccc);
    cursor: not-allowed;
    transform: none;
}

.chat-send-btn .material-icons {
    font-size: 18px;
}

/* ==========================================================================
   输入区域底部
   ========================================================================== */

.chat-input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-tertiary, #999);
}

.char-counter {
    font-variant-numeric: tabular-nums;
}

.chat-hints {
    opacity: 0.7;
}

/* ==========================================================================
   错误和加载状态
   ========================================================================== */

.error-message {
    justify-content: center;
    margin: 16px 0;
}

.error-message .message-content {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--error-bg, #ffebee);
    color: var(--error-color, #c62828);
    border: 1px solid var(--error-border, #ffcdd2);
    border-radius: 8px;
    font-size: 14px;
}

.message-error {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--error-color, #c62828);
    font-style: italic;
}

.loading-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary, #666);
    font-style: italic;
}

.loading-indicator::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color, #e0e0e0);
    border-top-color: var(--primary-color, #2196f3);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ==========================================================================
   提示消息
   ========================================================================== */

.chat-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 16px;
    background: var(--toast-bg, #333);
    color: white;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease;
    z-index: 1000;
}

.chat-toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-success {
    background: var(--success-color, #4caf50);
}

.toast-error {
    background: var(--error-color, #f44336);
}

.toast-warning {
    background: var(--warning-color, #ff9800);
}

/* ==========================================================================
   移动端适配
   ========================================================================== */

@media (max-width: 768px) {
    .chat-mode-container.mobile-layout {
        height: 100vh;
        max-height: none;
    }
    
    .chat-header {
        padding: 12px 16px;
    }
    
    .chat-title {
        font-size: 14px;
    }
    
    .chat-messages {
        padding: 16px;
    }
    
    .chat-message {
        margin-bottom: 16px;
    }
    
    .message-avatar {
        width: 32px;
        height: 32px;
        margin: 0 8px;
    }
    
    .avatar-icon {
        font-size: 16px;
        line-height: 32px;
    }
    
    .message-content {
        max-width: calc(100% - 48px);
    }
    
    .message-text {
        padding: 10px 14px;
        font-size: 13px;
        border-radius: 16px;
    }
    
    .user-message .message-text {
        border-bottom-right-radius: 4px;
    }
    
    .ai-message .message-text {
        border-bottom-left-radius: 4px;
    }
    
    .chat-input-area {
        padding: 12px 16px;
    }
    
    .chat-input-container {
        padding: 6px 12px;
        border-radius: 20px;
    }
    
    .chat-send-btn {
        width: 32px;
        height: 32px;
    }
    
    .chat-send-btn .material-icons {
        font-size: 16px;
    }
    
    .welcome-message {
        padding: 20px 16px;
    }
    
    .welcome-icon {
        font-size: 36px;
    }
    
    .welcome-text h3 {
        font-size: 18px;
    }
    
    .welcome-text p {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .chat-input-footer {
        flex-direction: column;
        gap: 4px;
        align-items: flex-start;
    }
    
    .chat-hints {
        font-size: 11px;
    }
}

/* ==========================================================================
   深色模式
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    .chat-mode-container {
        --bg-color: #1e1e1e;
        --chat-bg: #2d2d2d;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --text-tertiary: #808080;
        --border-color: #404040;
        --ai-bubble: #3d3d3d;
        --input-area-bg: #1e1e1e;
        --input-bg: #2d2d2d;
        --input-border: #404040;
        --action-btn-bg: #404040;
        --action-btn-hover: #505050;
        --toast-bg: #404040;
        --error-bg: #3d1a1a;
        --error-color: #ff6b6b;
        --error-border: #5d2a2a;
    }
}

[data-theme="dark"] .chat-mode-container {
    --bg-color: #1e1e1e;
    --chat-bg: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-color: #404040;
    --ai-bubble: #3d3d3d;
    --input-area-bg: #1e1e1e;
    --input-bg: #2d2d2d;
    --input-border: #404040;
    --action-btn-bg: #404040;
    --action-btn-hover: #505050;
    --toast-bg: #404040;
    --error-bg: #3d1a1a;
    --error-color: #ff6b6b;
    --error-border: #5d2a2a;
}

/* ==========================================================================
   高对比度模式
   ========================================================================== */

@media (prefers-contrast: high) {
    .chat-mode-container {
        --border-color: #000000;
        --ai-bubble: #ffffff;
        --input-border: #000000;
    }
    
    .message-text {
        border-width: 2px;
    }
    
    .chat-input-container {
        border-width: 3px;
    }
}

/* ==========================================================================
   减少动画模式
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .chat-message,
    .chat-control-btn,
    .message-action-btn,
    .chat-send-btn,
    .chat-toast,
    .loading-indicator::after {
        animation: none;
        transition: none;
    }
    
    .chat-messages {
        scroll-behavior: auto;
    }
}

/* ==========================================================================
   打印样式
   ========================================================================== */

@media print {
    .chat-mode-container {
        box-shadow: none;
        border: 1px solid #ccc;
        height: auto;
        max-height: none;
    }
    
    .chat-header,
    .chat-input-area,
    .message-actions {
        display: none;
    }
    
    .chat-messages {
        padding: 20px;
        overflow: visible;
    }
    
    .chat-message {
        break-inside: avoid;
        margin-bottom: 16px;
    }
    
    .message-text {
        background: transparent !important;
        color: #000 !important;
        border: 1px solid #ccc !important;
    }
    
    .welcome-message {
        display: none;
    }
}