.est-expression {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    color: #1a1a2e;
    margin: .5rem 0;
    letter-spacing: .05em;
}

.est-prompt {
    font-size: 1.1rem;
    font-weight: 700;
    text-align: center;
    color: #475569;
    margin: .3rem 0 .6rem;
}

.est-hint {
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    color: #6366f1;
    background: #eef2ff;
    border: 1px solid #c7d2fe;
    border-radius: 8px;
    padding: .4rem .8rem;
    margin: .3rem auto .4rem;
    max-width: 320px;
}

.est-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .7rem;
    margin: .8rem 0;
}

.est-option {
    margin: 0;
    padding: .9rem 1.8rem;
    font-size: 1.5rem;
    font-weight: 800;
    border: 2px solid #cbd5e1;
    border-radius: 12px;
    background: #fff;
    color: #1a1a2e;
    cursor: pointer;
    transition: transform .15s, border-color .15s, background-color .15s;
}

.est-option:hover {
    border-color: #6366f1;
    background: #eef2ff;
    transform: scale(1.06);
}