/* AI对话气泡 */
.chat-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px;
    max-height: 480px;
    overflow-y: auto;
}
.chat-bubble {
    display: flex;
    gap: 12px;
    max-width: 88%;
    animation: fadeIn 0.3s ease;
}
.chat-bubble.user { flex-direction: row-reverse; margin-left: auto; }
.bubble-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
    background: var(--color-primary);
}
.bubble-body {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 12px 16px;
    font-size: 0.93rem;
    line-height: 1.7;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.chat-bubble.user .bubble-body {
    background: var(--color-highlight);
    color: #fff;
    border-color: var(--color-highlight);
}
.bubble-ai-deepseek .bubble-avatar { background: #e3f0ff; }
.bubble-ai-doubao .bubble-avatar { background: #fff3e0; }
.bubble-meta {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* 输入区 */
.chat-input-area {
    display: flex;
    gap: 10px;
    padding: 16px 20px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}
.chat-input {
    flex: 1;
    padding: 10px 16px;
    border: 2px solid var(--color-border);
    border-radius: 24px;
    font-size: 0.93rem;
    font-family: var(--font-body);
    outline: none;
    resize: none;
    background: var(--color-card);
    transition: border-color 0.3s;
}
.chat-input:focus { border-color: var(--color-highlight); }
.chat-send-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--color-highlight);
    color: #fff;
    border: none;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s;
    flex-shrink: 0;
}
.chat-send-btn:hover { transform: scale(1.08); }

/* AI选择标签 */
.ai-tabs {
    display: flex;
    gap: 8px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--color-border);
}
.ai-tab {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 2px solid var(--color-border);
    background: var(--color-card);
    cursor: pointer;
    transition: all 0.3s;
}
.ai-tab.active {
    border-color: var(--color-highlight);
    background: var(--color-highlight);
    color: #fff;
    font-weight: 600;
}

/* 思考动画 */
.thinking-dots span {
    display: inline-block;
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--color-text-muted);
    margin: 0 2px;
    animation: thinking 1.2s ease-in-out infinite;
}
.thinking-dots span:nth-child(2) { animation-delay: 0.2s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes thinking {
    0%,60%,100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}