body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #0d1117;
    color: #c9d1d9;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #58a6ff;
}

.container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 600px;
    gap: 10px;
}

textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #30363d;
    border-radius: 5px;
    font-size: 16px;
    resize: none;
    box-sizing: border-box;
    white-space: pre-wrap;
    overflow-wrap: break-word;
    background-color: #0d1117;
    color: #c9d1d9;
}

textarea:focus {
    outline: 2px solid #58a6ff;
}

.output-container textarea {
    background-color: #161b22;
    border: 1px solid #30363d;
    color: #c9d1d9;
}

.highlight {
    background-color: #d29922;
    color: #f0f6fc;
    font-weight: bold;
}

button {
    padding: 12px 20px;
    font-size: 16px;
    font-weight: bold;
    color: white;
    background-color: #238636;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
}

button:hover {
    background-color: #2ea043;
}

button:active {
    background-color: #1a7f37;
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.5rem;
    }
    button {
        font-size: 14px;
        padding: 10px 15px;
    }
}