.master-prompt {
    font-size: 1.15rem;
    font-weight: 600;
    color: #444;
    text-align: center;
    margin: 0.5rem 0 1rem;
}

.master-expression {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 5rem;
    margin: 0 auto 1.25rem;
    padding: 0.75rem 1.5rem;
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: #7a4a00;
    background: #fff8e8;
    border: 2px solid #f2cd82;
    border-radius: 16px;
}

.master-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.master-option {
    min-width: 5rem;
    padding: 0.85rem 1.4rem;
    font-size: 1.9rem;
    font-weight: 800;
    color: #7a4a00;
    background: #ffffff;
    border: 2px solid #f2cd82;
    border-radius: 14px;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.master-option:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(122, 74, 0, 0.18);
}

.master-input-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.master-input {
    width: 7rem;
    padding: 0.7rem;
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    color: #7a4a00;
    background: #fff8e8;
    border: 2px solid #f2cd82;
    border-radius: 14px;
}

.master-hint {
    text-align: left;
}

.master-hint p {
    margin: 0.35rem 0;
}