#gcf-calculator {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 800px;
    margin: 0 0;
    padding: 1px;
    /*background: white;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);*/
}

#gcf-calculator h2 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-weight: 600;
}

#gcf-calculator .input-group {
    margin-bottom: 20px;
}

#gcf-calculator label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #444;
}

#gcf-calculator input {
    width: 100%;
    padding: 6px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

#gcf-calculator input:focus {
    border-color: #4a86e8;
    outline: none;
}

#gcf-calculator .buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

#gcf-calculator button {
    /*flex: 1;*/
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#gcf-calculator button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

#gcf-calculator button:active {
    transform: translateY(0);
}

#gcf_calculate_btn {
    background: #28a745;
    color: white;
}

#gcf_clear_btn {
    background: #6c757d;
    color: white;
}

#gcf-calculator .result-container {
    margin-top: 30px;
}

#gcf-calculator .gcf-result {
    background-color: #d4edda;
    color: #155724;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
    text-align: center;
    font-size: 20px;
    font-weight: 600;
}

#gcf-calculator .result-title {
    font-weight: 600;
    margin-bottom: 15px;
    color: #444;
    font-size: 18px;
    padding-bottom: 5px;
    border-bottom: 2px solid #eee;
}

#gcf-calculator .factorization-steps {
    margin-bottom: 25px;
}

#gcf-calculator .factorization-step {
    margin-bottom: 15px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

#gcf-calculator .common-factors {
    margin-top: 25px;
    padding: 20px;
    background-color: #e8f0fe;
    border-radius: 8px;
}

#gcf-calculator .step-explanation {
    margin-top: 10px;
    padding: 10px;
    background-color: #fff3cd;
    border-radius: 6px;
    font-size: 15px;
}

#gcf-calculator sup {
    font-size: 0.8em;
    vertical-align: super;
}

#gcf-calculator .error-message {
    color: #d32f2f;
    font-weight: 500;
    margin-top: 10px;
    padding: 10px;
    background-color: #ffebee;
    border-radius: 4px;
}

#gcf-calculator .instructions {
    margin-top: 15px;
    font-size: 14px;
    color: #666;
    font-style: italic;
}