.comb-prompt {
    font-size: 1.15rem;
    text-align: center;
    color: #475569;
    margin: .4rem 0 .2rem;
}

.comb-counter {
    text-align: center;
    font-weight: 800;
    color: var(--primary);
    margin: .2rem 0 .8rem;
}

.comb-build {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .6rem;
    margin: .6rem 0;
}

.comb-slot {
    width: 56px;
    height: 56px;
    font-size: 1.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    background: #f8fafc;
    color: #cbd5e1;
    cursor: pointer;
    transition: border-color .15s, background-color .15s, transform .15s;
}

.comb-slot.filled {
    border-style: solid;
    border-color: var(--primary);
    background: #fff;
    color: #1e293b;
}

.comb-slot.filled:hover {
    transform: scale(1.06);
}

.comb-tray {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .6rem;
    margin: .6rem 0 1rem;
}

.comb-item {
    width: 56px;
    height: 56px;
    font-size: 1.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--primary);
    border-radius: 12px;
    background: #fff;
    cursor: pointer;
    transition: transform .15s, opacity .15s;
}

.comb-item:hover:not(:disabled) {
    transform: scale(1.08);
}

.comb-item.used,
.comb-item:disabled {
    opacity: .3;
    cursor: default;
}

.comb-found {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: .4rem;
    max-width: 380px;
    margin: 0 auto .6rem;
}

.comb-found-cell {
    display: flex;
    justify-content: center;
    gap: .2rem;
    padding: .45rem .3rem;
    border-radius: 10px;
    background: #dcfce7;
    color: #1e293b;
    font-size: 1.3rem;
}

.comb-found-cell.empty {
    background: #f1f5f9;
    color: #94a3b8;
}

.comb-choice-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: .7rem;
    max-width: 380px;
    margin: .8rem auto .4rem;
}

.comb-choice-option {
    padding: .8rem 1rem;
    font-size: 1.4rem;
    font-weight: 800;
    border: 2px solid var(--primary);
    border-radius: 12px;
    background: #fff;
    color: #1e293b;
    cursor: pointer;
    transition: transform .15s, background-color .15s, border-color .15s;
}

.comb-choice-option:hover:not(:disabled) {
    transform: scale(1.04);
}

.comb-choice-option.comb-choice-correct {
    background: #dcfce7;
    border-color: #16a34a;
    color: #166534;
}

.comb-reason-prompt {
    grid-column: 1 / -1;
    margin: 0 0 .2rem;
    font-size: 1.05rem;
    font-weight: 700;
    color: #334155;
}

.comb-choice-option.comb-reason-option {
    grid-column: 1 / -1;
    font-size: 1.2rem;
    font-weight: 700;
}

.comb-diagram {
    display: block;
    width: 200px;
    height: 200px;
    margin: .2rem auto .6rem;
}