body {
    font-family: sans-serif;
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    text-align: center;
    background: #1a1a2e;
    color: #eee;
}

h1 { margin-bottom: 10px; }

#status {
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    background: #333;
}

.connected { background: #155724 !important; }
.disconnected { background: #721c24 !important; }

#main-content {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

#heatmap-container {
    text-align: center;
}

#heatmap {
    border: 2px solid #444;
    margin-bottom: 10px;
}

#thermistor, #prediction {
    margin: 5px 0;
    font-size: 18px;
}

#controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 10px;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 6px;
}

#btn-single { background: #3498db; color: white; }
#btn-start { background: #2ecc71; color: white; }
#btn-stop { background: #e74c3c; color: white; }

#message {
    margin-top: 15px;
    padding: 10px;
    min-height: 20px;
}