style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #f0f4f8;
    color: #333;
    font-family: Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

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

.container {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 20px;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

button {
    background: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

button:hover {
    background: #0056b3;
}

button.dark-mode {
    background: #444;
}

.editor-container {
    display: flex;
    gap: 20px;
    height: calc(100vh - 80px);
}

.input, .output {
    flex: 1;
    padding: 20px;
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, box-shadow 0.3s;
}

body.dark-mode .input, body.dark-mode .output {
    background: #222;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
}

label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
}

textarea {
    width: 100%;
    height: calc(33vh - 40px);
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    resize: vertical;
    transition: border-color 0.3s;
}

textarea:focus {
    border-color: #007bff;
}

body.dark-mode textarea:focus {
    border-color: #555;
}

iframe {
    width: 100%;
    height: 100%;
    border: 1px solid #ddd;
    border-radius: 4px;
    transition: border-color 0.3s;
}

body.dark-mode iframe {
    border-color: #444;
}