body {
    margin: 0;
    padding: 0;
    background: aliceblue;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.container {
    width: 95%;
    max-width: 720px;
    text-align: center;
    padding: 10px 0 20px;
}

h2 {
    margin: 0 0 8px;
    font-size: 1.3rem;
    color: #333;
}

.toggle-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    margin-bottom: 10px;
}

.toggle-btn {
    padding: 5px 12px;
    border: 2px solid #ccc;
    border-radius: 16px;
    background: #fff;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    transition: opacity 0.2s, border-color 0.2s;
}

.toggle-btn.active {
    opacity: 1;
}

.toggle-btn.inactive {
    opacity: 0.4;
}

.chart-wrapper {
    position: relative;
    width: 100%;
    max-width: 620px;
    margin: 0 auto;
}