body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #111827;
    color: white;
}

.container {
    max-width: 600px;
    margin: auto;
    padding: 20px;
}

h1 {
    text-align: center;
}

.card {
    background: #1f2937;
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
}

.row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

select,
input,
button {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: none;
    margin-top: 10px;
    box-sizing: border-box;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

button {
    background: #2563eb;
    color: white;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    opacity: 0.9;
}

.stop-btn {
    background: #dc2626;
}

.sensor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
}

.sensor-box {
    background: #374151;
    padding: 20px;
    border-radius: 14px;
    text-align: center;
}

.sensor-box span {
    font-size: 32px;
    display: block;
}