.oo-prompt {
    font-size: 1.15rem;
    text-align: center;
    color: #475569;
    margin: .4rem 0 .8rem;
}

.oo-expression {
    font-size: 2.2rem;
    font-weight: 800;
    text-align: center;
    color: #1e293b;
    padding: 1rem;
    background: #f1f5f9;
    border-radius: 12px;
    margin: 0 auto 1rem;
    max-width: 320px;
}

.oo-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .7rem;
    margin: .6rem 0;
}

.oo-option {
    margin: 0;
    min-width: 3.6rem;
    padding: .8rem 1.2rem;
    font-size: 1.4rem;
    font-weight: 800;
    border: 2px solid var(--primary);
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    transition: transform .15s, border-color .15s, background-color .15s;
}

.oo-option:hover {
    border-color: #2563eb;
    background: #2563eb;
    transform: scale(1.06);
}