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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #fafafa;
    padding: 10px;
}

.chart-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 15px;
    height: 420px;
}

.controls {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.controls button {
    padding: 8px 16px;
    border: 1px solid #ddd;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}

.controls button:hover {
    background: #f0f0f0;
}

.controls button.active {
    background: #3498db;
    color: white;
    border-color: #3498db;
}

.separator {
    color: #ccc;
    padding: 0 5px;
    display: flex;
    align-items: center;
}

@media (max-width: 600px) {
    .chart-container {
        height: 350px;
        padding: 10px;
    }

    .controls button {
        padding: 6px 12px;
        font-size: 12px;
    }
}