* { box-sizing: border-box; }
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background: #f5f7fa;
    color: #333;
}
.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 30px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.login-container h2 { text-align: center; margin-bottom: 30px; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: bold; }
.form-group input { width: 100%; padding: 8px; border: 1px solid #ddd; border-radius: 4px; }
button {
    background: #3498db;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
}
button:hover { background: #2980b9; }
.error { color: red; margin: 10px 0; }
.success { color: green; margin: 10px 0; }
.header {
    background: #2c3e50;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header a { color: white; margin-left: 15px; }
.device-selector {
    padding: 15px 20px;
    background: white;
    border-bottom: 1px solid #ddd;
}
.dashboard { padding: 20px; }
.card-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}
.card {
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    text-align: center;
}
.card h3 { margin: 0 0 10px; font-size: 16px; color: #7f8c8d; }
.card p { font-size: 24px; margin: 0; font-weight: bold; }
.control-panel, .settings-panel {
    background: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}
.load-btn {
    font-size: 18px;
    padding: 10px 25px;
}
.load-btn.on { background: #e74c3c; }
.load-btn.off { background: #2ecc71; }
.param-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 15px;
    margin: 20px 0;
}
.param-item {
    display: flex;
    align-items: center;
    gap: 10px;
}
.param-item label { width: 180px; font-weight: bold; }
.param-item input { flex: 1; padding: 5px; }
.param-item button { width: 80px; }
.danger-zone { margin-top: 20px; text-align: right; }
.danger-btn { background: #e74c3c; }
.danger-btn:hover { background: #c0392b; }
.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal-content {
    background: white;
    padding: 30px;
    border-radius: 8px;
    width: 400px;
    max-width: 90%;
}
.modal-content input { width: 100%; margin: 10px 0; padding: 8px; }
.no-device { text-align: center; padding: 50px; color: #7f8c8d; }