body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f7f6;
    color: #333;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1 {
    margin: 0;
    font-size: 1.5rem;
}

.controls {
    display: flex;
    gap: 1rem;
}

select {
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid #ccc;
    font-size: 1rem;
    background-color: white;
}

main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.chart-container {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    height: 70vh;
}

canvas {
    width: 100% !important;
    height: 100% !important;
}