.system-cell-btn {
    display: inline-block;
    width: 100%;
    padding: 8px 12px;
    background-color: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    box-sizing: border-box;
    transition: background-color 0.15s ease;
}

.system-cell-btn:hover  { background-color: #e0e0e0; }
.system-cell-btn.active { background-color: #e3f2fd; }

.system-cell-btn.total-btn {
    background-color: #e8f5e9;
    color: #2e7d32;
    cursor: default;
    pointer-events: none;
}

.system-breakdown-row td {
    padding: 0;
    background-color: #fafafa;
}

.system-breakdown-inner {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
}

.system-breakdown-inner.open {
    max-height: 600px;
}

.system-breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.system-breakdown-table th {
    background-color: #e0e0e0;
    color: #333;
    padding: 6px 8px;
    text-align: center;
}

.system-breakdown-table td {
    border: 1px solid #ddd;
    padding: 6px 8px;
}

.system-breakdown-total {
    text-align: right;
    font-weight: bold;
    padding: 6px 8px;
    border: 1px solid #ddd;
}

.buttons-row button {
    width: 150px;
    height: 50px;
}