/* Sections are drawn like air-traffic flight strips: a coloured band on the
   left says which lake layer the numbers come from, the body holds them. */

:root {
  color-scheme: light;
  --page: #e8edf2;
  --surface: #fbfcfd;
  --ink: #13233a;
  --ink-2: #4b5a6e;
  --muted: #7a8696;
  --grid: #dde3ea;
  --axis: #b9c3cf;
  --rule: rgba(19, 35, 58, 0.12);

  --s1: #2a78d6;
  --s2: #eb6834;
  --s3: #1baf7a;
  --ord-1: #86b6ef;
  --ord-2: #3987e5;
  --ord-3: #184f95;
  --seq-0: #eef4fc;
  --seq-1: #0d366b;

  --good: #0ca30c;
  --warning: #fab219;
  --critical: #d03b3b;

  --bronze: #b7793f;
  --silver: #8c9bb0;
  --history: #7b68d9;
  --gold: #d9a520;
  --ops: #3d7ea6;

  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --text: "Barlow", system-ui, sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0b141f;
  --surface: #13202f;
  --ink: #eef2f6;
  --ink-2: #b8c3d0;
  --muted: #8592a3;
  --grid: #223244;
  --axis: #34475c;
  --rule: rgba(255, 255, 255, 0.1);
  --s1: #3987e5;
  --s2: #d95926;
  --s3: #199e70;
  --ord-1: #184f95;
  --ord-2: #3987e5;
  --ord-3: #9ec5f4;
  --seq-0: #18293b;
  --seq-1: #9ec5f4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 400 16px/1.5 var(--text);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, summary:focus-visible, .chart:focus-visible {
  outline: 2px solid var(--s1);
  outline-offset: 3px;
}

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

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

.top { border-bottom: 1px solid var(--rule); }
.top-row { display: flex; align-items: baseline; gap: 24px; padding-top: 18px; padding-bottom: 14px; }
.mark {
  font: 700 26px/1 var(--display);
  letter-spacing: 0.01em;
  text-decoration: none;
  /* The wordmark is the four layer colours in lake order. */
  background: linear-gradient(90deg, var(--bronze) 0 25%, var(--silver) 25% 50%, var(--history) 50% 75%, var(--gold) 75%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.top-note { margin: 0; color: var(--ink-2); font-size: 15px; flex: 1; }
.theme {
  font: 500 14px/1 var(--text);
  color: var(--ink-2);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 7px 12px;
  cursor: pointer;
}
.theme:hover { color: var(--ink); border-color: var(--axis); }

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 40px;
  padding: 48px 0 36px;
  align-items: start;
}
.hero h1 {
  font: 600 44px/1.05 var(--display);
  margin: 0 0 18px;
  max-width: 16ch;
}
.lede { margin: 0 0 24px; color: var(--ink-2); max-width: 46ch; font-size: 17px; }

.readout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 18px;
  margin: 0;
  padding: 14px 16px;
  background: var(--surface);
  border-left: 4px solid var(--history);
}
.readout dt { color: var(--muted); font-size: 14px; }
.readout dd { margin: 0; font: 600 20px/1.2 var(--display); font-variant-numeric: tabular-nums; }
.readout .now { grid-column: 1 / -1; font: 500 15px/1.3 var(--text); color: var(--ink-2); }

.hero-chart { margin: 0; background: var(--surface); padding: 18px 18px 8px; border-top: 4px solid var(--history); }
.hero-chart figcaption { font: 600 19px/1.2 var(--display); }
.hero-chart figcaption span { display: block; font: 400 14px/1.4 var(--text); color: var(--ink-2); margin-top: 2px; }

/* ---- pipeline ---- */

.flow {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 2px;
  padding: 0;
  margin: 0 0 32px;
}
.flow li { background: var(--surface); padding: 12px 14px 14px; border-top: 4px solid var(--c, var(--ops)); }
.flow b { display: block; font: 600 17px/1.2 var(--display); }
.flow .n { font: 600 26px/1.15 var(--display); font-variant-numeric: tabular-nums; margin-top: 6px; display: block; }
.flow small { display: block; color: var(--ink-2); font-size: 13.5px; line-height: 1.35; }

/* ---- strips ---- */

.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 16px; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.strip { display: grid; grid-template-columns: 30px minmax(0, 1fr); background: var(--surface); min-width: 0; }
.strip[data-layer="bronze"] { --layer: var(--bronze); }
.strip[data-layer="history"] { --layer: var(--history); }
.strip[data-layer="gold"] { --layer: var(--gold); }
.strip[data-layer="ops"] { --layer: var(--ops); }

.band {
  background: var(--layer);
  color: #fff;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  font: 500 13px/1 var(--display);
}
.band b { font-weight: 700; font-size: 15px; }
.strip[data-layer="gold"] .band { color: #1d1606; }

.body { padding: 18px 20px 16px; min-width: 0; }
.body h2 { font: 600 22px/1.15 var(--display); margin: 0 0 4px; }
.sub { margin: 0 0 14px; color: var(--ink-2); font-size: 14.5px; max-width: 70ch; }

details { margin-top: 8px; font-size: 14px; }
summary { cursor: pointer; color: var(--ink-2); }
summary:hover { color: var(--ink); }

table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; font-size: 14px; }
th { text-align: left; font-weight: 500; color: var(--muted); padding: 6px 8px 6px 0; border-bottom: 1px solid var(--axis); }
td { padding: 6px 8px 6px 0; border-bottom: 1px solid var(--grid); }
td.num, th.num { text-align: right; }

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

.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart text { font-family: var(--text); fill: var(--muted); font-size: 12px; }
.chart .lbl { fill: var(--ink-2); font-size: 12.5px; }
.chart .lbl-strong { fill: var(--ink); font-weight: 600; font-size: 13px; }
.chart .grid line { stroke: var(--grid); stroke-width: 1; }
.chart .axis { stroke: var(--axis); stroke-width: 1; }
.chart-hero { cursor: crosshair; touch-action: none; }
#heat, #volume { overflow-x: auto; }
#heat svg { min-width: 760px; }
#volume svg { min-width: 640px; }

.legend { display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 0 0 8px; padding: 0; list-style: none; font-size: 13.5px; color: var(--ink-2); }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 2px; margin-right: 6px; vertical-align: -1px; }

.delay-row td:first-child { font-weight: 500; }
.bar-cell { width: 42%; }
.bar-cell span { display: block; height: 10px; background: var(--s2); border-radius: 0 4px 4px 0; }

.checks { list-style: none; margin: 0; padding: 0; font-size: 14px; columns: 2 320px; column-gap: 32px; }
.checks li { break-inside: avoid; }
.checks li { display: grid; grid-template-columns: 52px minmax(0, 1fr); gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--grid); }
.checks .st { font: 600 13px/1.6 var(--display); display: flex; align-items: center; gap: 5px; }
.checks .st svg { flex: none; }
.checks .what { color: var(--ink); }
.checks .why { display: block; color: var(--ink-2); font-size: 13px; }

.tip {
  position: fixed;
  z-index: 10;
  pointer-events: none;
  background: var(--ink);
  color: var(--surface);
  padding: 8px 10px;
  border-radius: 3px;
  font-size: 13px;
  line-height: 1.4;
  max-width: 260px;
  font-variant-numeric: tabular-nums;
}
.tip b { font-weight: 600; }

.foot { padding-top: 28px; padding-bottom: 40px; color: var(--muted); font-size: 13.5px; }
.foot p { margin: 0 0 4px; }

@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; gap: 24px; padding-top: 32px; }
  .hero h1 { font-size: 36px; max-width: 20ch; }
  .flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid > .strip { grid-column: span 12; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 14px; }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .top-note { display: none; }
  .hero h1 { font-size: 31px; }
}
@media (prefers-reduced-motion: no-preference) {
  .hero-chart .cursor { transition: opacity 120ms; }
}