html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: sans-serif;
    background: #1e1e1e;
    color: #ffffff;
    display: flex;
    flex-direction: column;
}

#top-bar {
    height: 50px;
    flex-shrink: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1em;
    background-color: #333;
    border-bottom: 1px solid #444;
}

#title {
    font-size: 1.2em;
    font-weight: bold;
}

#run-btn {
    padding: 0.4em 1em;
    font-size: 1em;
    background: #007acc;
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

#run-btn:hover {
    background: #005f99;
}

#main {
    flex: 1;
    display: flex;
}

#editor,
#output {
    width: 50%;
    height: 100%;
}

#output {
    background: #111;
    color: #0f0;
    overflow: auto;
    font-family: monospace;
    font-size: 0.95em;
    white-space: pre-wrap;
    border-left: 1px solid #333;
    padding: 1em;
}