.sound-io-widget {
    margin: 1.5rem 0;
    padding: 1.25rem;
    border-radius: 24px;
    background: linear-gradient(135deg, #f8fafc, #eef2ff);
    border: 1px solid #dbeafe;
    box-shadow: 0 16px 38px rgba(15, 23, 42, 0.08);
}

.sound-io-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin-bottom: 1.25rem;
}

.sound-io-controls button {
    border: 1px solid #cbd5e1;
    background: white;
    color: #334155;
    border-radius: 999px;
    padding: 0.6rem 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sound-io-controls button:hover,
.sound-io-controls button.active {
    background: #0f172a;
    border-color: #0f172a;
    color: white;
    transform: translateY(-1px);
}

/* IMPORTANT: 5 blocks + 4 arrows = 9 columns */
.sound-io-diagram {
    display: grid;
    grid-template-columns:
        minmax(150px, 1fr) 34px
        minmax(150px, 1fr) 34px
        minmax(150px, 1fr) 34px
        minmax(150px, 1fr) 34px
        minmax(150px, 1fr);
    gap: 0.45rem;
    align-items: stretch;
    overflow-x: auto;
    padding: 0.25rem 0 0.75rem;
}

.sound-stage {
    min-width: 150px;
    display: grid;
    gap: 0.25rem;
    align-content: center;
    justify-items: center;
    text-align: center;
    padding: 1rem 0.75rem;
    border-radius: 20px;
    background: white;
    border: 2px solid #e2e8f0;
    color: #334155;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
    transition: all 0.25s ease;
}

.sound-stage strong {
    color: #0f172a;
}

.sound-stage small {
    color: #64748b;
    line-height: 1.25;
}

.sound-stage .stage-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 999px;
    background: #eff6ff;
    color: #1d4ed8;
    font-weight: 900;
}

.sound-stage.active-stage {
    border-color: #2563eb;
    transform: translateY(-3px);
    box-shadow: 0 16px 34px rgba(37, 99, 235, 0.16);
}

.sound-stage.converter.active-stage {
    border-color: #f97316;
    background: #fff7ed;
}

.sound-stage.converter .stage-icon {
    background: #ffedd5;
    color: #9a3412;
}

.sound-arrow {
    align-self: center;
    justify-self: center;
    color: #64748b;
    font-size: 2rem;
    font-weight: 900;
    transition: transform 0.25s ease, color 0.25s ease;
}

.sound-arrow.active-arrow {
    color: #2563eb;
    transform: scale(1.18);
}

.sound-arrow.conversion-arrow.active-arrow {
    color: #f97316;
}

.sound-io-explanation {
    margin-top: 1rem;
    padding: 1rem 1.15rem;
    border-radius: 18px;
    background: white;
    border: 1px solid #e2e8f0;
}

.sound-io-explanation h3 {
    margin-top: 0;
    color: #0f172a;
}

.sound-io-explanation p {
    margin-bottom: 0;
    color: #334155;
}

/* Keep all blocks on the same horizontal line on smaller screens */
@media (max-width: 760px) {
    .sound-io-diagram {
        grid-template-columns:
            minmax(150px, 1fr) 34px
            minmax(150px, 1fr) 34px
            minmax(150px, 1fr) 34px
            minmax(150px, 1fr) 34px
            minmax(150px, 1fr);
        overflow-x: auto;
    }

    .sound-stage {
        min-width: 150px;
    }

    .sound-arrow,
    .sound-arrow.active-arrow {
        transform: none;
    }
}