:root {
  --paper:      #e7eae1;
  --panel:      #f1f3ec;
  --ink:        #1f2e2a;
  --ink-soft:   #5d6c64;
  --rule:       #c7d0c1;
  --grid:       #d4dbcd;
  --trace-1:    #a8392a;
  --trace-2:    #29607a;
  --trace-3:    #4f6b2c;
  --trace-4:    #6b4c78;
  --ok:         #3d7a46;
  --warn:       #a8392a;
  --sans: ui-sans-serif, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:    #15201e;
    --panel:    #1c2926;
    --ink:      #e5eae0;
    --ink-soft: #91a198;
    --rule:     #31423c;
    --grid:     #27352f;
    --trace-1:  #e58063;
    --trace-2:  #74b3d1;
    --trace-3:  #9dc56d;
    --trace-4:  #b79ad0;
    --ok:       #7fb886;
    --warn:     #e58063;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  max-width: 62rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}

h1, h2 { margin: 0; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.0625rem; }

p { margin: 0; }

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}

.sub {
  margin-top: 0.2rem;
  color: var(--ink-soft);
  font-size: 0.875rem;
}

.masthead-side { text-align: right; }

.relays { display: flex; gap: 0.9rem; justify-content: flex-end; flex-wrap: wrap; }

.relay {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

.dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ink-soft);
  flex: none;
}
.relay[data-state="open"]       .dot { background: var(--ok); }
.relay[data-state="connecting"] .dot { background: var(--ink-soft); animation: blink 1.4s infinite; }
.relay[data-state="closed"]     .dot { background: var(--warn); }

@keyframes blink { 50% { opacity: 0.25; } }

.age { margin-top: 0.35rem; font-size: 0.8125rem; color: var(--ink-soft); }

.notice {
  margin: 1rem 0 0;
  padding: 0.6rem 0.85rem;
  border-left: 3px solid var(--warn);
  background: var(--panel);
  font-size: 0.875rem;
}

/* ---------- hero ---------- */

.hero { margin-top: 1.75rem; }

.hero-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}

.stats {
  display: flex;
  gap: 1.25rem;
  font-size: 0.8125rem;
  color: var(--ink-soft);
}
.stats b { font-weight: 600; color: var(--ink); }

.plot {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 3px;
}
.plot canvas { display: block; width: 100%; height: 100%; }

.plot-hero { height: 300px; }

/* ---------- ranges ---------- */

.ranges {
  display: flex;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
}

.ranges button {
  padding: 0.35rem 0.8rem;
  font: inherit;
  font-size: 0.8125rem;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  cursor: pointer;
}
.ranges button:hover { color: var(--ink); }
.ranges button.on {
  color: var(--paper);
  background: var(--ink);
  border-color: var(--ink);
}
:focus-visible { outline: 2px solid var(--trace-2); outline-offset: 2px; }

/* ---------- secondary charts ---------- */

.grid {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
  margin-top: 1.75rem;
}

.card .plot { height: 150px; }
.card .hero-head { margin-bottom: 0.5rem; }

.empty {
  margin-top: 2.5rem;
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

/* ---------- footer ---------- */

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

.meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.3rem 1.25rem;
  margin: 0 0 1.25rem;
}
.meta dt { color: var(--ink-soft); }
.meta dd { margin: 0; color: var(--ink); overflow-wrap: anywhere; }

.colophon { max-width: 46ch; line-height: 1.6; }

/* ---------- hover tooltip ---------- */

.tip {
  position: fixed;
  z-index: 10;
  padding: 0.35rem 0.55rem;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.75rem;
  line-height: 1.35;
  border-radius: 3px;
  pointer-events: none;
  white-space: nowrap;
}

@media (max-width: 34rem) {
  body { padding: 1.25rem 1rem 2rem; }
  .masthead-side, .relays { text-align: left; justify-content: flex-start; }
  .plot-hero { height: 220px; }
  .meta { grid-template-columns: 1fr; gap: 0 0; }
  .meta dd { margin-bottom: 0.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}