:root {
    --bg: #0b1016;
    --bg-grad-a: #0e1520;
    --bg-grad-b: #091019;
    --card: #121a24;
    --card-border: #1e2a38;
    --text: #e6edf3;
    --text-dim: #8b9aad;
    --accent: #4ade80;
    --accent-warm: #fbbf24;
    --accent-cool: #3ad0ff;
    --track: #1a2533;
    --danger: #f87171;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: radial-gradient(1200px 800px at 20% -10%, var(--bg-grad-a), var(--bg-grad-b) 60%);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

main {
    max-width: 880px;
    margin: 0 auto;
    padding: 28px 20px 60px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 2px 0;
}

.topbar h1 {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0.4px;
    margin: 0;
    color: var(--text-dim);
    text-transform: uppercase;
}

.pill {
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid var(--card-border);
    background: rgba(255,255,255,0.02);
    color: var(--text-dim);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.pill::before {
    content: "";
    width: 6px; height: 6px;
    border-radius: 50%;
    background: currentColor;
}

.pill--ok    { color: var(--accent); }
.pill--idle  { color: var(--text-dim); }
.pill--error { color: var(--danger); }

.card {
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0) 60%), var(--card);
    border: 1px solid var(--card-border);
    border-radius: 18px;
    padding: 24px;
    box-shadow: 0 10px 40px -20px rgba(0,0,0,0.7);
}

.card--gauge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding-top: 28px;
    padding-bottom: 28px;
}

#gauge {
    width: min(100%, 380px);
    height: auto;
}

.gauge-track {
    fill: none;
    stroke: var(--track);
    stroke-width: 18;
    stroke-linecap: round;
}

.gauge-value {
    fill: none;
    stroke-width: 18;
    stroke-linecap: round;
    transition: stroke-dashoffset 700ms cubic-bezier(0.22, 1, 0.36, 1);
    filter: drop-shadow(0 0 6px rgba(74, 222, 128, 0.25));
}

.gauge-ticks text {
    fill: var(--text-dim);
    font-size: 11px;
    font-weight: 500;
    text-anchor: middle;
}

.gauge-ticks line {
    stroke: var(--text-dim);
    stroke-width: 1.5;
    opacity: 0.5;
}

.gauge-needle {
    stroke: var(--text);
    stroke-width: 3;
    stroke-linecap: round;
    transform-origin: 160px 160px;
    transform: rotate(-120deg);
    transition: transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.gauge-hub {
    fill: var(--text);
}

.readout {
    text-align: center;
    margin-top: -8px;
}

.readout-value {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -1px;
    line-height: 1;
    color: var(--text);
    display: inline-flex;
    align-items: baseline;
    gap: 8px;
}

.readout-value .unit {
    font-size: 20px;
    font-weight: 500;
    color: var(--text-dim);
    letter-spacing: 0;
}

.readout-sub {
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-dim);
}

.card--chart {
    padding: 20px 20px 12px;
}

.chart-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.chart-head h2 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dim);
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.chart-stats {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-dim);
}

.chart-stats strong {
    color: var(--text);
    font-weight: 600;
    margin-left: 4px;
}

.chart-wrap {
    position: relative;
    height: 260px;
    margin-top: 8px;
}

footer {
    text-align: center;
    font-size: 12px;
    color: var(--text-dim);
    opacity: 0.7;
    margin-top: 4px;
}

@media (max-width: 520px) {
    main { padding: 16px 12px 40px; gap: 14px; }
    .card { padding: 18px; border-radius: 14px; }
    .readout-value { font-size: 44px; }
    .chart-wrap { height: 220px; }
}