/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        min-width: 100%;
        height: auto;
        max-height: 40vh;
        border-right: none;
        border-bottom: 2px solid var(--color-border);
        padding: 12px;
        gap: 8px;
    }
    #app {
        flex-direction: column;
    }
    .main-area {
        height: auto;
        flex: 1;
    }
    .input-controls-row {
        gap: 6px;
    }
    select {
        max-width: 160px;
        font-size: var(--font-size-sm);
        padding: 10px 28px 10px 10px;
        min-height: 40px;
    }
    .skill-tag {
        padding: 8px 12px;
        font-size: 14px;
        min-height: 36px;
    }
    .input-row textarea {
        min-height: 56px;
        font-size: var(--font-size-sm);
    }
    .send-btn {
        min-height: 56px;
        min-width: 64px;
        padding: 12px 18px;
        font-size: var(--font-size-md);
    }
    .message-row {
        max-width: 95%;
    }
    .messages-container {
        padding: 16px;
        gap: 14px;
    }
    :root {
        --sidebar-width: 100%;
    }
}