*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:        #0f172a;
  --surface:   #1e293b;
  --border:    #334155;
  --text:      #e2e8f0;
  --muted:     #94a3b8;
  --good:      #22c55e;
  --warn:      #f59e0b;
  --bad:       #ef4444;
  --blue:      #3b82f6;
  --violet:    #8b5cf6;
  --amber:     #f59e0b;
  --green:     #22c55e;
  --cyan:      #06b6d4;
  --radius:    0.75rem;
}

body {
  font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
}

/* ── Header ─────────────────────────────────────────── */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1.75rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

h1 {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
}

.muted {
  color: var(--muted);
  font-size: 0.75rem;
}

/* ── Main layout ─────────────────────────────────────── */

main {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Gauge cards ─────────────────────────────────────── */

.gauges {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 1024px) {
  .gauges { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 540px) {
  .gauges { grid-template-columns: 1fr; }
}

.gauge-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1rem;
}

.gauge-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.gauge-value {
  font-size: 2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  line-height: 1;
  margin-bottom: 0.875rem;
}

.gauge-track {
  height: 5px;
  background: var(--border);
  border-radius: 9999px;
  overflow: hidden;
}

.gauge-fill {
  height: 100%;
  width: 0%;
  border-radius: 9999px;
  transition: width 0.5s ease, background-color 0.5s ease;
  background: var(--good);
}

.gauge-abs {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 0.4rem;
  font-variant-numeric: tabular-nums;
}

/* Network gauge */

.net-rows {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.net-row {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.net-arrow {
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
}

.net-arrow.up   { color: var(--green); }
.net-arrow.down { color: var(--cyan); }

.net-row .gauge-value {
  font-size: 1.5rem;
  margin-bottom: 0;
}

.net-unit {
  font-size: 0.7rem;
}

/* ── Chart cards ─────────────────────────────────────── */

.charts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

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

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.chart-title {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.chart-wrap {
  position: relative;
  height: 220px;
}

/* ── Project health cards ─────────────────────────────── */

.section-title {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 0.4rem;
  vertical-align: middle;
  background: var(--muted);
  flex-shrink: 0;
}
.status-dot.up   { background: var(--good); box-shadow: 0 0 5px var(--good); }
.status-dot.down { background: var(--bad);  box-shadow: 0 0 5px var(--bad); }