body {
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 1200px;
    margin: auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.btn {
    display: inline-block;
    background: #007bff;
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 4px;
    margin: 10px 0;
}
.account {
    border: 1px solid #ddd;
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
}
.devices-list {
    margin-top: 10px;
    padding: 10px;
    background: #f9f9f9;
    border-radius: 4px;
}
.device-card {
    border-bottom: 1px solid #eee;
    padding: 8px 0;
}
.online { color: green; }
.offline { color: red; }
.error { color: red; margin: 10px 0; }