/* Resetting some default styles */
body, h1, textarea, button {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    color: #333;
}

.container {
    width: 90%;
    max-width: 800px;
    margin: auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 24px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background-color: #007bff;
    color: white;
    cursor: pointer;
    margin-right: 10px;
}

button:hover {
    background-color: #0056b3;
}

textarea {
    width: 100%;
    height: 150px;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
    margin-bottom: 10px;
}

.controls {
    margin-bottom: 20px;
}

.output {
    background-color: #fff;
    padding: 15px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    margin: 5px 0;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 5px;
    border: 1px solid #ddd;
}

.dark-mode {
    background-color: #333;
    color: #f0f0f0;
}

.dark-mode header, .dark-mode .output {
    background-color: #444;
    color: #f0f0f0;
}

.dark-mode textarea {
    background-color: #555;
    color: #f0f0f0;
    border: 1px solid #666;
}

.dark-mode button {
    background-color: #007bff;
    color: #f0f0f0;
}

.dark-mode button:hover {
    background-color: #0056b3;
}