/* Expansion panel — 16-key strips stacked above main panel */

.expansion-stack {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.expansion-section {
    padding: 12px;
    border: 2px dashed #f59e0b;
    border-radius: 8px;
    background: rgba(245, 158, 11, 0.06);
}

.expansion-section.hidden {
    display: none;
}

.expansion-banner {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.expansion-badge {
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #92400e;
    background: #f59e0b;
    padding: 3px 8px;
    border-radius: 3px;
}

.expansion-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: #fbbf24;
}

.expansion-subtitle {
    font-size: 0.7rem;
    color: #9ca3af;
}

.expansion-chassis {
    background: linear-gradient(180deg, #2a2a2e 0%, #1a1a1c 100%);
    border: 2px solid #3d3d42;
    border-radius: 6px;
    padding: 8px 12px;
}

.expansion-chassis .key-block {
    aspect-ratio: 1.35 / 1;
}

.expansion-grid {
    display: grid;
    grid-template-columns: repeat(16, minmax(0, 1fr));
    gap: 1px;
}

.expansion-toggle-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 12px;
}

.expansion-toggle-row label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: #d1d5db;
    cursor: pointer;
}

.expansion-toggle-row input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    accent-color: #f59e0b;
}

.expansion-toggle-row .expansion-toggle-nested {
    margin-left: 1.5rem;
}