/* ==================== AI 助手聊天 ==================== */
.ai-chat {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 220px);
    min-height: 420px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.ai-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ai-msg {
    max-width: 86%;
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
}
.ai-msg.user {
    align-self: flex-end;
    background: var(--primary);
    color: #fff;
    border-bottom-right-radius: 4px;
}
.ai-msg.assistant {
    align-self: flex-start;
    background: var(--bg);
    color: var(--text);
    border-bottom-left-radius: 4px;
}
.ai-msg.error {
    background: #fdecea;
    color: var(--danger);
}

.ai-typing {
    align-self: flex-start;
    color: var(--text-secondary);
    font-size: 13px;
    padding: 6px 14px;
}

.ai-empty {
    text-align: center;
    color: var(--text-secondary);
    margin: auto;
    padding: 24px;
    font-size: 14px;
    max-width: 420px;
}

.ai-suggest {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 6px;
}
.ai-suggest .chip {
    padding: 8px 14px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    border-radius: 999px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}
.ai-suggest .chip:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.ai-input-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    border-top: 1px solid var(--border);
    background: #fff;
}
.ai-input-bar .input { flex: 1; }

.ai-voice-btn {
    width: 40px;
    height: 40px;
    flex: none;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    border-radius: var(--radius);
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}
.ai-voice-btn:hover { border-color: var(--primary); }
.ai-voice-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.ai-voice-btn.listening {
    background: #fdecea;
    border-color: var(--danger);
    animation: ai-pulse 1.2s infinite;
}
.ai-voice-btn.muted { opacity: 0.55; }
@keyframes ai-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.35); }
    50% { box-shadow: 0 0 0 6px rgba(231, 76, 60, 0); }
}