body {
    background-color: #f4f4f9;
}

h1 {
    color: #f39c12;
}

.chart-container {
    position: relative;
    width: 100%;
    height: 500px;
}

.tooltip {
    position: absolute;
    text-align: center;
    padding: 6px;
    font: 12px sans-serif;
    background: #333;
    color: white;
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
}

.axis line,
.axis path {
    stroke: #ccc;
}

.axis text {
    fill: #666;
    font-size: 12px;
}

.bar {
    fill: #3498db;
    transition: fill 0.2s;
}

.bar:hover {
    fill: #2980b9;
}

.line {
    fill: none;
    stroke: #e74c3c;
    stroke-width: 2px;
}

.area {
    fill: rgba(231, 76, 60, 0.2);
}