body {
    background: aliceblue;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 10px 15px;
}

h1 {
    text-align: center;
    font-size: 1.2rem;
    color: #333;
    margin: 5px 0 10px 0;
}

.chart-wrapper {
    position: relative;
    width: 100%;
    max-height: 420px;
}

canvas {
    width: 100% !important;
    max-height: 420px;
}

.controls {
    text-align: center;
    margin: 8px 0 4px 0;
}

.controls button {
    padding: 6px 14px;
    font-size: 0.85rem;
    border: 1px solid #3F51B5;
    background: #3F51B5;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    margin: 0 4px;
}

.controls button:hover {
    background: #303F9F;
}

.controls button.inactive {
    background: white;
    color: #3F51B5;
}

#detail-panel {
    margin-top: 10px;
    padding: 12px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 6px;
    display: none;
    font-size: 0.9rem;
    line-height: 1.5;
}

#detail-panel h3 {
    margin: 0 0 6px 0;
    font-size: 1rem;
}

#detail-panel .close-btn {
    float: right;
    cursor: pointer;
    font-size: 1.1rem;
    color: #999;
    border: none;
    background: none;
}