.eil_nkf_container {
    width: 90%;
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.eil_nkf_container h2 {
    color: #1a1a1a;
    margin-bottom: 2rem;
    text-align: center;
}

.eil_nkf_container label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.eil_nkf_container input[type="text"] {
    width: 100%;
    padding: 1rem;
    margin-bottom: 2rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
}

.calculate-button {
    padding: 1rem 2rem;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.calculate-button:hover {
    background: #0056b3;
}

.calculate-button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.calculate-button i {
    margin-right: 5px;
}

.eil_nkf_result {
    margin-top: 2rem;
    font-size: 1rem;
    text-align: center;
}

.eil_nkf_section {
    margin-bottom: 1.5rem;
}

.eil_nkf_copy-button {
    padding: 0.8rem 1.5rem;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    margin-top: 1rem;
    transition: background-color 0.3s ease;
}

.eil_nkf_copy-button:hover {
    background: #218838;
}

.eil_nkf_copy-button i {
    margin-right: 5px;
}

.eil_nkf_loader {
    display: none;
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    animation: eil_nkf_spin 1s linear infinite;
    margin: 1rem auto;
}

@keyframes eil_nkf_spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.eil_nkf_usage-instructions {
    margin-top: 2rem;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    background-color: #f0f2f5;
    font-size: 14px;
    line-height: 1.5;
}

@media (max-width: 400px) {
    .eil_nkf_container {
        padding: 1.5rem;
    }
}