.nrg-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 600px;
}

.nrg-button {
    width: 100%;
    padding: 20px;
    font-size: 24px;
    cursor: pointer;
}

.nrg-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.nrg-message {
    margin-top: 10px;
    font-size: 14px;
}

.nrg-wrapper {
    max-width: 700px;
}

.nrg-feed {
    margin-top: 40px;
}

.nrg-feed-item {
    padding: 20px;
    border: 1px solid #ddd;
    margin-bottom: 15px;
    border-radius: 8px;
}

.nrg-feed-number {
    font-weight: bold;
    margin-bottom: 8px;
}

.nrg-feed-date {
    margin-top: 10px;
    font-size: 12px;
    opacity: 0.6;
}


.nrg-button.is-clicked {
    opacity: 0.4;
    cursor: not-allowed;
    background: #eee;
}