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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

header h1 {
    font-size: 2.5em;
    color: #667eea;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.control-group label {
    font-weight: 600;
    color: #555;
    font-size: 0.9em;
}

.control-group input[type="number"],
.control-group input[type="text"] {
    padding: 10px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.control-group input[type="number"]:focus,
.control-group input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    padding: 10px 15px;
    border-radius: 8px;
    transition: background-color 0.3s;
}

.toggle-label:hover {
    background-color: rgba(102, 126, 234, 0.1);
}

.toggle-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #667eea;
}

.toggle-label span {
    font-weight: 600;
    color: #555;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary.stop {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.stat-label {
    font-size: 0.9em;
    opacity: 0.9;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    font-size: 2em;
    font-weight: bold;
}

.chart-container {
    background: white;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: relative;
    height: 400px;
}

.log-container {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
}

.log-container h3 {
    margin-bottom: 15px;
    color: #333;
}

.activity-log {
    max-height: 200px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.log-entry {
    padding: 8px;
    margin-bottom: 5px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.log-entry.success {
    background: #d4edda;
    color: #155724;
}

.log-entry.error {
    background: #f8d7da;
    color: #721c24;
}

.log-entry .timestamp {
    opacity: 0.7;
    margin-right: 10px;
}

.log-entry .ping-value {
    font-weight: bold;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 2em;
    }

    .controls {
        flex-direction: column;
    }

    .control-group {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .chart-container {
        height: 300px;
    }
}