body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f5f6f8;
    color: #222;
}

main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 24px;
}

h1 {
    margin-top: 0;
    margin-bottom: 32px;
}

.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}

.metric {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
}

.metric-label {
    font-size: 14px;
    color: #666;
    margin-bottom: 8px;
}

.metric-value {
    font-size: 28px;
    font-weight: 600;
}

.last-reading {
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

.chart-card {
    margin-top: 32px;
    height: 400px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    padding-bottom: 30px;
}

    .chart-card h2 {
        margin-top: 0;
        margin-bottom: 20px;
        font-size: 20px;
    }

.range-selector {
    display: flex;
    gap: 8px;
    margin: 24px 0;
}

    .range-selector a {
        padding: 8px 14px;
        border: 1px solid #ccc;
        border-radius: 6px;
        background: white;
        color: #333;
        text-decoration: none;
    }

        .range-selector a.active {
            background: #222;
            color: white;
            border-color: #222;
        }

.chart-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

@media (max-width: 900px) {
    .chart-grid {
        grid-template-columns: 1fr;
    }
}


.metric-detail {
    margin-top: 6px;
    font-size: 0.8rem;
    color: #666;
}

.metric-current {
    border-left: 4px solid #22c55e;
}

.metric-delayed {
    border-left: 4px solid #f59e0b;
}

.metric-stale {
    border-left: 4px solid #ef4444;
}