body {
    background-color: #000000;
    color: #00FFFF;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 2rem;
}

.container {
    max-width: 900px;
    margin: auto;
    background-color: #111;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 0 10px #0ff;
}

h1, h2, h3 {
    color: #00FFFF;
}

button, select, input[type="text"] {
    background-color: #00FFFF;
    color: #000;
    border: none;
    padding: 0.4rem 0.8rem;
    margin: 0.3rem 0.2rem;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
}

button:hover {
    background-color: #0099cc;
}

input[type="text"] {
    width: 100%;
    margin-top: 0.5rem;
}

.chart, .metrics {
    margin-top: 2rem;
    background-color: #222;
    padding: 1rem;
    border-radius: 8px;
}

.toggle-darkmode {
    float: right;
    margin-top: -2rem;
}