:root {
    --primary-color: #03a9f4;
    --secondary-color: #2196f3;
    --background-color: #f5f5f5;
    --card-color: #ffffff;
    --text-color: #333333;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.card {
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 20px;
    margin-bottom: 20px;
}

.card h2 {
    color: var(--secondary-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-dot {
    display: inline-block;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: #ccc;
}

.status-dot.online {
    background-color: #4CAF50;
}

.status-dot.offline {
    background-color: #F44336;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: var(--secondary-color);
}

.activity-log {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 10px;
    background-color: #f9f9f9;
}

.activity-log p {
    margin-bottom: 5px;
    padding-bottom: 5px;
    border-bottom: 1px solid #eee;
}

.activity-log p:last-child {
    margin-bottom: 0;
    border-bottom: none;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: #777;
    font-size: 14px;
}