body {
    margin: 0;
    padding: 40px;
    background-color: #f4f4f7;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    color: #333;
}

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

.back-btn {
    display: inline-block;
    text-decoration: none;
    color: #888;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 30px;
    transition: color 0.2s;
}

.back-btn:hover {
    color: #000;
}

.header h2 {
    margin: 0;
    font-size: 32px;
    font-weight: 500;
}

.header p {
    color: #aaa;
    margin-top: 5px;
}

.chart-wrapper {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    margin-top: 30px;
}