body {
    font-family: Arial, sans-serif;
    background: #121212;
    color: #e0e0e0;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

h1 {
    font-size: 2rem;
    margin: 0 0 30px;
    color: #f0f0f0;
    font-weight: 600;
}

.main-container {
    display: flex;
    gap: 20px;
    width: 100%;
    max-width: 1400px;
    align-items: stretch;
}

.button-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

#input-values,
#output-values {
    flex: 1;
    padding: 15px;
    border: 2px solid #555;
    color: #e0e0e0;
    border-radius: 6px;
    font: 16px 'Courier New', monospace;
    resize: vertical;
    min-height: 500px;
    box-sizing: border-box;
    background: #1e1e1e;
}

#input-values:focus,
#output-values:focus {
    outline: none;
    border-color: #8ab4f8;
}


#convert-btn,
#copy-btn {
    width: 250px;
    box-sizing: border-box; 
}

#convert-btn {
    background: #F9FAFB;
    color: #111827;
    border: none;
    padding: 20px 40px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
}

#convert-btn:hover {
    background: #e0e0e0;
}

#copy-btn {
    background: transparent;
    color: #F9FAFB;
    border: 2px solid #F9FAFB;
    padding: 20px 40px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
}

#copy-btn:hover {
    background: rgba(249, 250, 251, 0.1);
    border-color: #e0e0e0;
}

@media (max-width: 640px) {
    .main-container {
        flex-direction: column;
        gap: 15px;
    }
    
    #input-values,
    #output-values {
        min-height: 300px;
    }
}

/* Styles for the "Add quotes" checkbox and label */
.checkbox-container {
    display: flex;
    align-items: center;
    margin-top: 20px;
    gap: 8px; 
}

#add-quotes {
    transform: scale(1.4);
    margin: 0;
}

.checkbox-container label {
    font-size: 1.15rem; 
}