html,
body {
    margin: 0;
    padding: 0;
    background: transparent;
    font-family: system-ui, sans-serif;
    color: #ffffff;
}

.widget-shell {
    background: linear-gradient(180deg, #0f1720, #152330);
    border-radius: 24px;
    padding: 24px;
    box-sizing: border-box;
    min-height: 100vh;
}

.widget-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.widget-header h2 {
    margin: 0;
    font-size: 1.4rem;
}

.range-selector {
    display: flex;
    gap: 10px;
}

.range-selector button {
    border: 0;
    background: rgba(255,255,255,0.08);
    color: #fff;
    padding: 8px 14px;
    border-radius: 12px;
    cursor: pointer;
}

.range-selector button.active {
    background: #2f89ff;
}

.chart-container {
    position: relative;
    height: 520px;
}

.widget-footer {
    margin-top: 18px;
    opacity: 0.7;
    font-size: 0.9rem;
}