:root {
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --text-main: #333333;
    --primary: #4CAF50;
    --danger: #f44336;
    --offline: #9e9e9e;
    --online: #4CAF50;
    --poor: #ff9800;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #2c3e50;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.status-indicator {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    font-size: 1.2em;
    font-weight: bold;
}

.status-dot {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    margin-right: 10px;
    background-color: var(--offline);
}

.status-dot.online {
    background-color: var(--online);
}

.status-dot.poor {
    background-color: var(--poor);
}

.status-dot.offline {
    background-color: var(--danger);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.info-row:last-child {
    border-bottom: none;
}

.controls {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.btn {
    flex: 1;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: bold;
    color: white;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

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

.map-card h3 {
    margin-bottom: 5px;
    font-size: 1.1em;
    color: #2c3e50;
}

#map {
    z-index: 1;
    border: 1px solid #ddd;
}

.session-info {
    text-align: center;
    margin-top: 20px;
    color: #7f8c8d;
}