.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.model-selector {
    display: flex;
    gap: 8px;
}

.model-btn {
    padding: 6px 12px;
    font-size: 14px;
    border: 1px solid #1a73e8;
    background-color: transparent;
    color: #1a73e8;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.model-btn.active {
    background-color: #1a73e8;
    color: white;
}

.model-btn:hover {
    background-color: #1557b0;
    color: white;
}