section textarea {
    width: 100%;
    min-height: 80px;
    margin-bottom: 1rem;
    border: 1px solid #cfd8dc;
    border-radius: 6px;
    padding: 0.7rem;
    font-size: 1rem;
    resize: vertical;
    background: #f4f8fb;
    transition: border 0.2s;
}
section textarea:focus {
    border: 1.5px solid #3d8a59;
    outline: none;
}
section button {
    background: #3d8a59;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 0.7rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin-bottom: 1rem;
}
section button:hover {
    background: #347a4d;
}
#diffResult {
    margin-top: 1rem;
    font-size: 1.1rem;
    background: #f4f8fb;
    border-radius: 6px;
    padding: 1rem;
    min-height: 30px;
    word-break: break-word;
}