:root {
  --page: #f5f7f8;
  --surface: #ffffff;
  --surface-sunk: #eef2f4;
  --ink: #161d24;
  --ink-muted: #5b6672;
  --ink-faint: #8b96a1;
  --border: #e0e5ea;
  --border-strong: #c8d1d8;
  --accent: #226f80;
  --accent-soft: #dcebee;
  --good: #2c7a4d;
  --good-soft: #dff0e6;
  --warn: #8d6410;
  --warn-soft: #f7ecd7;
  --bad: #a83a36;
  --bad-soft: #f8e3e2;
  --grid: #e8edf0;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0f1418;
    --surface: #171e24;
    --surface-sunk: #131a20;
    --ink: #e4e9ed;
    --ink-muted: #95a1ac;
    --ink-faint: #6c7883;
    --border: #263039;
    --border-strong: #36424c;
    --accent: #63a7b7;
    --accent-soft: #14313a;
    --good: #55ae7c;
    --good-soft: #14291d;
    --warn: #d3a45f;
    --warn-soft: #2b2417;
    --bad: #d17d78;
    --bad-soft: #2d1c1b;
    --grid: #222c34;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 20px 72px;
  background: var(--page);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 940px;
  margin: 0 auto;
}

a {
  color: var(--accent);
  text-underline-offset: 2px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

/* header ---------------------------------------------------------------- */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 24px;
  padding: 28px 0 18px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}

.brand {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.brand span {
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 18px;
  margin-left: auto;
  font-size: 13.5px;
}

.nav a {
  color: var(--ink-muted);
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
}

/* headline --------------------------------------------------------------- */

h1 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0 0 6px;
  text-wrap: balance;
}

.lede {
  color: var(--ink-muted);
  margin: 0 0 26px;
  max-width: 62ch;
}

.headline {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 10px 28px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 26px;
}

.headline-figure {
  font-family: var(--mono);
  font-size: 38px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.headline-label {
  font-size: 13px;
  color: var(--ink-muted);
  padding-bottom: 3px;
}

.headline-meta {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  text-align: right;
  line-height: 1.7;
}

/* cards ------------------------------------------------------------------ */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 15px 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-name {
  font-weight: 600;
  font-size: 14.5px;
}

.pill {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 3px;
  white-space: nowrap;
}

.pill::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: none;
}

.pill-up {
  background: var(--good-soft);
  color: var(--good);
}
.pill-up::before {
  background: var(--good);
  border-radius: 50%;
}

.pill-slow {
  background: var(--warn-soft);
  color: var(--warn);
}
.pill-slow::before {
  background: var(--warn);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.pill-down {
  background: var(--bad-soft);
  color: var(--bad);
}
.pill-down::before {
  background: var(--bad);
  clip-path: polygon(25% 0, 75% 0, 100% 25%, 100% 75%, 75% 100%, 25% 100%, 0 75%, 0 25%);
}

.pill-unknown {
  background: var(--surface-sunk);
  color: var(--ink-faint);
}
.pill-unknown::before {
  background: var(--ink-faint);
  border-radius: 50%;
}

.readings {
  display: flex;
  gap: 22px;
}

.reading-value {
  font-family: var(--mono);
  font-size: 17px;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.reading-label {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
}

.plot {
  position: relative;
}

.plot svg {
  display: block;
  width: 100%;
  height: 62px;
  overflow: visible;
}

.tip {
  position: absolute;
  pointer-events: none;
  background: var(--ink);
  color: var(--page);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.45;
  padding: 5px 8px;
  border-radius: 4px;
  white-space: nowrap;
  transform: translate(-50%, -100%);
  opacity: 0;
  transition: opacity 0.08s linear;
  z-index: 5;
}

.tip.on {
  opacity: 1;
}

.axis-note {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-faint);
  border-top: 1px solid var(--border);
  padding-top: 6px;
}

/* table ------------------------------------------------------------------ */

.table-bar {
  margin: 26px 0 0;
}

.toggle {
  font: inherit;
  font-size: 13px;
  color: var(--ink-muted);
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 5px 11px;
  cursor: pointer;
}

.toggle:hover {
  color: var(--ink);
}

.table-scroll {
  overflow-x: auto;
  margin-top: 14px;
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 520px;
  font-size: 13.5px;
}

th {
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-strong);
  padding: 0 14px 7px 0;
}

td {
  border-bottom: 1px solid var(--border);
  padding: 8px 14px 8px 0;
}

td.num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

/* prose pages ------------------------------------------------------------ */

.prose h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 28px 0 8px;
}

.prose p,
.prose li {
  max-width: 66ch;
}

.prose ul {
  padding-left: 20px;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.87em;
  background: var(--surface-sunk);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

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

footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--ink-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

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