.eguweb-spreadsheet-message {
    max-width: 600px;
    margin: 20px auto;
    padding: 30px;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    text-align: center;
    position: relative;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.eguweb-spreadsheet-message .message {
    font-size: 1.4em;
    line-height: 1.6;
    margin-bottom: 25px;
    color: #333;
    font-weight: 500;
    padding: 0 20px;
}

.eguweb-spreadsheet-message .buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    justify-content: center;
    align-items: center;
}

.eguweb-spreadsheet-message .refresh-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    background-color: #f8f9fa;
    color: #2c3e50;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    letter-spacing: 0.02em;
    border: none;
    cursor: pointer;
    width: 100%;
    max-width: 300px;
}

.eguweb-spreadsheet-message .refresh-button:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.eguweb-spreadsheet-message .refresh-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.eguweb-spreadsheet-message.error {
    background-color: #fff5f5;
    border-left: 4px solid #dc3545;
    color: #dc3545;
}

/* レスポンシブ対応 */
@media screen and (max-width: 768px) {
    .eguweb-spreadsheet-message {
        margin: 15px;
        padding: 20px;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    }

    .eguweb-spreadsheet-message .message {
        font-size: 1.2em;
        padding: 0 10px;
    }

    .eguweb-spreadsheet-message .refresh-button {
        padding: 12px 28px;
        font-size: 1em;
    }
}

@media screen and (max-width: 480px) {
    .eguweb-spreadsheet-message {
        margin: 10px;
        padding: 15px;
        border-radius: 12px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    }

    .eguweb-spreadsheet-message .message {
        font-size: 1.1em;
        margin-bottom: 15px;
    }

    .eguweb-spreadsheet-message .refresh-button {
        padding: 10px 24px;
        font-size: 0.95em;
    }
}