/* ============================================
 * AI聊天模块 - Nebula 主题重新设计
 * 玻璃拟态 · 紫蓝渐变 · 高级质感
 * ============================================ */

.ai-chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 160px);
    max-width: 960px;
    margin: 0 auto;
    padding: 24px;
    position: relative;
}

/* 动态背景光晕 */
.ai-chat-container::before {
    content: '';
    position: fixed;
    top: 100px;
    right: -300px;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--bg-hover) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

/* 聊天头部 */
.ai-chat-container .chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    position: relative;
}

.ai-chat-container .chat-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
}

.ai-chat-container .header-left h2 {
    margin: 0 0 8px 0;
    font-size: 28px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.ai-chat-container .header-left p {
    margin: 0;
    opacity: 0.55;
    font-size: 14px;
    color: var(--text-secondary);
}

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

/* 模型选择器 - 玻璃拟态 */
.ai-chat-container .model-select {
    padding: 12px 16px;
    background: var(--bg-input);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    min-width: 200px;
    transition: all var(--transition);
}

.ai-chat-container .model-select:hover {
    border-color: var(--border-glow);
    background: var(--bg-hover);
}

.ai-chat-container .model-select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--bg-hover);
}

/* 按钮 */
.ai-chat-container .btn-secondary {
    padding: 12px 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.ai-chat-container .btn-secondary:hover {
    background: rgba(244, 63, 94, 0.1);
    border-color: rgba(244, 63, 94, 0.3);
    color: var(--error);
    transform: translateY(-1px);
}

/* 聊天主体 */
.ai-chat-container .chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 消息列表 - 毛玻璃效果 */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    margin-bottom: 20px;
    box-shadow: var(--shadow-card);
}

/* 欢迎页 */
.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 60px 40px;
}

.chat-welcome .welcome-icon {
    font-size: 72px;
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.chat-welcome h3 {
    margin: 0 0 12px 0;
    font-size: 26px;
    font-weight: 600;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.chat-welcome p {
    margin: 0 0 32px 0;
    opacity: 0.55;
    font-size: 15px;
    color: var(--text-secondary);
}

/* 模型标签 */
.welcome-models {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.welcome-models .model-tag {
    padding: 12px 24px;
    background: var(--bg-hover);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-full);
    font-size: 14px;
    color: var(--primary-light);
    transition: all var(--transition);
}

.welcome-models .model-tag:hover {
    background: var(--bg-hover);
    border-color: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

/* 单条消息 */
.chat-message {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    animation: fadeIn 0.4s ease;
}

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

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

/* 头像 - 渐变光晕 */
.chat-message .message-avatar {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    border-radius: 50%;
    font-size: 22px;
    flex-shrink: 0;
    border: 1px solid var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.chat-message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent), var(--primary-light));
}

/* 消息气泡 - 玻璃拟态 */
.chat-message .message-body {
    max-width: calc(100% - 60px);
    position: relative;
}

.chat-message.user .message-body {
    background: var(--bg-hover);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-xl) var(--radius-xl) 4px var(--radius-xl);
    padding: 16px 20px;
    box-shadow: var(--shadow);
}

.chat-message.assistant .message-body {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl) var(--radius-xl) var(--radius-xl) 4px;
    padding: 16px 20px;
    box-shadow: var(--shadow);
}

/* 消息内容 */
.chat-message .message-content {
    word-break: break-word;
    white-space: pre-wrap;
    line-height: 1.7;
    font-size: 14px;
    color: var(--text-primary);
}

.chat-message .message-meta {
    font-size: 12px;
    opacity: 0.4;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.message-model {
    font-size: 11px;
    color: var(--primary-light);
    background: var(--bg-hover);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
}

/* 输入区域 - 玻璃拟态 */
.chat-input-area {
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 20px;
    box-shadow: var(--shadow-card);
    transition: border-color var(--transition);
}

.chat-input-area:focus-within {
    border-color: var(--border-glow);
}

.chat-input-area .input-wrapper {
    display: flex;
    gap: 14px;
    align-items: flex-end;
}

.chat-input-area #chat-input {
    flex: 1;
    padding: 16px 20px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    resize: none;
    min-height: 52px;
    max-height: 140px;
    line-height: 1.6;
    transition: all var(--transition);
}

.chat-input-area #chat-input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--bg-hover);
    background: var(--bg-input);
}

.chat-input-area #chat-input::placeholder {
    color: var(--text-muted);
}

/* 发送按钮 - 渐变流动 */
.chat-input-area .send-btn {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    background-size: 200% 200%;
    animation: gradient-flow 3s ease infinite;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

@keyframes gradient-flow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.chat-input-area .send-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.chat-input-area .send-btn:active {
    transform: translateY(-1px);
}

.chat-input-area .input-hints {
    display: flex;
    justify-content: space-between;
    margin-top: 12px;
    font-size: 12px;
    opacity: 0.4;
    color: var(--text-secondary);
}

/* 加载动画 */
.chat-message.loading .message-body {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px;
}

.loading-dots {
    display: flex;
    gap: 6px;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    background: var(--primary-light);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }
.loading-dots span:nth-child(3) { animation-delay: 0s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* 滚动条美化 */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: var(--radius-full);
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* 响应式 */
@media (max-width: 640px) {
    .ai-chat-container {
        padding: 16px;
    }

    .chat-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }

    .header-actions {
        width: 100%;
        flex-wrap: wrap;
    }

    .model-select {
        width: 100%;
    }
}