/* Blueprint: a drafting sheet in Prussian blue, paper-white marks, and
   highlighter colors for the operations being looked at. */

:root {
  color-scheme: dark;

  --blueprint: #0f2c4c;
  --blueprint-deep: #0b2340;
  --paper: #e9f1f8;
  --muted: #a9bfd4;
  --rule: rgba(233, 241, 248, 0.2);
  --grid-minor: rgba(190, 220, 255, 0.055);
  --grid-major: rgba(190, 220, 255, 0.1);

  /* Operations on bars */
  --bar: #a9c0d7;
  --range: rgba(233, 241, 248, 0.07);
  --compare: #ffd166;
  --move: #ff8a7a;
  --read: #8ec5ff;
  --done: #7fdccf;

  /* Chart series, validated on --blueprint-deep (adjacent CVD dE >= 8.4) */
  --c1: #d95926;
  --c2: #199e70;
  --c3: #c98500;
  --c4: #d55181;
  --c5: #9085e9;

  --sans: "Archivo", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --gutter: clamp(16px, 4vw, 48px);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  background-color: var(--blueprint);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px);
  background-size:
    120px 120px,
    120px 120px,
    24px 24px,
    24px 24px;
  color: var(--paper);
  font: 400 17px/1.55 var(--sans);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--paper);
  text-underline-offset: 3px;
}

code,
pre {
  font-family: var(--mono);
  font-size: 0.86em;
  font-variant-ligatures: none;
}

:focus-visible {
  outline: 2px solid var(--compare);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 16px;
  top: 12px;
  z-index: 10;
  background: var(--paper);
  color: var(--blueprint);
  padding: 6px 12px;
}

/* ---------- Header ---------- */

.top {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 12px var(--gutter);
  background: rgba(15, 44, 76, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}

.brand {
  font-weight: 700;
  font-stretch: 112%;
  text-decoration: none;
  white-space: nowrap;
}

.top nav {
  display: flex;
  gap: 20px;
  margin-right: auto;
}

.top nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}
.top nav a:hover {
  color: var(--paper);
}

.star {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--paper);
  border-radius: 3px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}
.star:hover {
  background: var(--paper);
  color: var(--blueprint);
}
.star-count {
  padding-left: 8px;
  border-left: 1px solid currentColor;
}

/* ---------- Sheets ---------- */

main {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.sheet {
  padding: 72px 0 24px;
}
.sheet + .sheet {
  border-top: 1px solid var(--rule);
  margin-top: 48px;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 800;
  line-height: 1.05;
}

h1 {
  font-size: clamp(38px, 5.4vw, 74px);
  font-stretch: 125%;
  letter-spacing: -0.015em;
  max-width: 15ch;
  line-height: 0.96;
}

h2 {
  font-size: clamp(28px, 3.6vw, 44px);
  font-stretch: 118%;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

h3 {
  font-size: 17px;
  font-weight: 700;
  font-stretch: 105%;
}

.lede {
  font-size: clamp(18px, 1.6vw, 21px);
  max-width: 58ch;
  color: var(--paper);
  margin: 24px 0 0;
}

.intro,
.aside {
  max-width: 68ch;
  color: var(--muted);
  margin: 0 0 24px;
}

.aside {
  margin-top: 20px;
  font-size: 15px;
}

.hero-text {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 32px 64px;
  align-items: end;
  margin-bottom: 40px;
}

/* ---------- Controls ---------- */

.controls,
.pickers,
.transport {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  margin-bottom: 20px;
}

label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 15px;
}

select,
button {
  font: inherit;
  font-size: 15px;
  color: var(--paper);
  background: var(--blueprint-deep);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 6px 12px;
}

select {
  padding-right: 8px;
}

button {
  cursor: pointer;
}
button:hover,
select:hover {
  border-color: var(--paper);
}
button.primary {
  background: var(--paper);
  color: var(--blueprint);
  border-color: var(--paper);
  font-weight: 600;
}
button.primary:hover {
  background: #fff;
}

input[type="range"] {
  accent-color: var(--compare);
  width: 140px;
}
input[type="checkbox"] {
  accent-color: var(--compare);
  width: 16px;
  height: 16px;
}

output {
  min-width: 3ch;
  color: var(--paper);
}

.toggle {
  display: inline-flex;
  flex-wrap: wrap;
}
.toggle button {
  border-radius: 0;
  margin-left: -1px;
}
.toggle button:first-child {
  border-radius: 3px 0 0 3px;
  margin-left: 0;
}
.toggle button:last-child {
  border-radius: 0 3px 3px 0;
}
.toggle button[aria-pressed="true"] {
  background: var(--paper);
  color: var(--blueprint);
  border-color: var(--paper);
  position: relative;
}

/* ---------- Race ---------- */

.lanes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.lane {
  display: grid;
  grid-template-rows: auto 132px auto;
  background: var(--blueprint-deep);
  border: 1px solid var(--rule);
  padding: 12px 12px 10px;
}

.lane header,
.lane footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.lane header {
  margin-bottom: 10px;
  min-height: 26px; /* room for the place badge, so canvases line up */
}

.lane canvas,
.stage canvas,
.probe-row canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.lane footer {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}

.lane-steps {
  white-space: nowrap;
  color: var(--paper);
}

.lane-note {
  text-align: right;
}

.lane-place {
  font-weight: 800;
  font-stretch: 120%;
  color: var(--done);
}

.lane.finished {
  border-color: rgba(127, 220, 207, 0.45);
}

/* ---------- Studio ---------- */

.studio {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.stage,
.source {
  background: var(--blueprint-deep);
  border: 1px solid var(--rule);
  padding: 16px;
}

.stage canvas {
  height: 280px;
  margin-bottom: 12px;
}

.narration {
  min-height: 1.6em;
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 14px;
}

.transport {
  margin-bottom: 12px;
}
.transport #studio-scrub {
  flex: 1 1 160px;
  width: auto;
}
.transport.secondary {
  margin-bottom: 0;
}

.check {
  gap: 6px;
}

.counters {
  font-size: 14px;
  color: var(--muted);
  margin-left: auto;
}

.source pre {
  margin: 0;
  overflow-x: auto;
  line-height: 1.6;
}

.source code {
  display: block;
  font-size: 13px;
}

.source .line {
  display: block;
  padding: 0 8px;
  white-space: pre;
  color: var(--muted);
  border-left: 2px solid transparent;
}

.source .line.active {
  color: var(--blueprint);
  background: var(--compare);
  border-left-color: var(--compare);
}

.note {
  margin: 14px 0 0;
  font-size: 15px;
  color: var(--muted);
}

/* ---------- Search ---------- */

.target {
  color: var(--muted);
  font-size: 15px;
}
.target output {
  font-weight: 700;
}

.probe-rows {
  display: grid;
  gap: 12px;
}

.probe-row {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 20px;
  background: var(--blueprint-deep);
  border: 1px solid var(--rule);
  padding: 14px 16px;
}

.probe-row canvas {
  height: 110px;
}

.probe-label p {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.probe-label .probe-stats {
  color: var(--compare);
  font-weight: 600;
}
.probe-label .probe-stats.bad {
  color: var(--move);
}

/* ---------- Measurements ---------- */

.measured-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  flex-wrap: wrap;
}

.title-block {
  display: grid;
  margin: 8px 0 24px;
  border: 1px solid var(--rule);
  min-width: 280px;
  font-size: 14px;
}
.title-block div {
  display: grid;
  grid-template-columns: 96px 1fr;
}
.title-block div + div {
  border-top: 1px solid var(--rule);
}
.title-block dt {
  padding: 6px 10px;
  color: var(--muted);
  border-right: 1px solid var(--rule);
}
.title-block dd {
  margin: 0;
  padding: 6px 10px;
}

.chart {
  margin: 0 0 48px;
  background: var(--blueprint-deep);
  border: 1px solid var(--rule);
  padding: 20px;
}

.chart figcaption {
  margin-bottom: 14px;
}

.chart-tabs {
  margin-bottom: 14px;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  margin-bottom: 8px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 10px 3px 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  background: transparent;
}
.legend-item[aria-pressed="false"] {
  opacity: 0.4;
  text-decoration: line-through;
}

.chart-frame {
  position: relative;
}

.chart-plot svg {
  display: block;
  overflow: visible;
}

.chart-plot .grid line {
  stroke: var(--rule);
  stroke-width: 1;
  opacity: 0.6;
}
.chart-plot text {
  fill: var(--muted);
  font: 12px var(--sans);
  font-variant-numeric: tabular-nums;
}
.chart-plot .axis {
  stroke: var(--muted);
}
.chart-plot .cache line {
  stroke: var(--paper);
  stroke-opacity: 0.35;
}
.chart-plot .cache text {
  fill: var(--paper);
  font-size: 11.5px;
}
.chart-plot .crosshair {
  stroke: var(--paper);
  stroke-opacity: 0.5;
}

.chart-tip {
  position: absolute;
  pointer-events: none;
  background: var(--blueprint);
  border: 1px solid var(--rule);
  padding: 8px 10px;
  font-size: 13px;
  min-width: 240px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}
.chart-tip strong {
  display: block;
  margin-bottom: 4px;
}
.chart-tip div {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
}
.tip-swatch {
  width: 10px;
  height: 3px;
}
.tip-value {
  color: var(--paper);
}

details {
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}
summary {
  cursor: pointer;
}

.table-wrap {
  overflow-x: auto;
  margin-top: 10px;
}

.chart-table {
  border-collapse: collapse;
  font-size: 12.5px;
  color: var(--paper);
}
.chart-table caption {
  text-align: left;
  color: var(--muted);
  padding-bottom: 6px;
}
.chart-table th,
.chart-table td {
  border: 1px solid var(--rule);
  padding: 4px 8px;
  text-align: right;
  white-space: nowrap;
}
.chart-table th[scope="row"] {
  text-align: left;
  font-family: var(--mono);
  font-weight: 400;
}

/* ---------- Run ---------- */

.shell {
  background: var(--blueprint-deep);
  border: 1px solid var(--rule);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 0 0 20px;
  line-height: 1.7;
  max-width: 760px;
}

.bottom {
  border-top: 1px solid var(--rule);
  padding: 28px var(--gutter) 48px;
  color: var(--muted);
  font-size: 14px;
  max-width: 1320px;
  margin: 48px auto 0;
}

/* ---------- Small screens ---------- */

@media (max-width: 900px) {
  .hero-text,
  .studio {
    grid-template-columns: minmax(0, 1fr);
  }
  .probe-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }
  .top nav {
    display: none;
  }
  .brand {
    margin-right: auto;
  }
}

@media (max-width: 520px) {
  .brand {
    font-size: 15px;
    white-space: normal;
  }
  .lanes {
    grid-template-columns: minmax(0, 1fr);
  }
  .lane {
    grid-template-rows: auto 104px auto;
  }
  .lane-note {
    display: none;
  }
  .stage canvas {
    height: 200px;
  }
  .counters {
    margin-left: 0;
  }
  .chart {
    padding: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}