:root {
  color-scheme: light;
  --ground: #0b3d2e;
  --paper: #f2efe3;
  --paper-deep: #dcd6c5;
  --ink: #f2efe3;
  --green: #f2efe3;
  --deep-green: #071c16;
  --rule: rgba(242, 239, 227, 0.34);
  --measure: min(72rem, calc(100vw - 2rem));
  font-family: Helvetica, "Neue Haas Grotesk", Univers, Arial, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
  border-radius: 0;
}

html {
  background: var(--ground);
  color: var(--ink);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent calc(16.666vw - 1px),
      rgba(242, 239, 227, 0.1) calc(16.666vw - 1px),
      rgba(242, 239, 227, 0.1) 16.666vw
    ),
    var(--ground);
}

a {
  color: inherit;
  text-underline-offset: 0.18em;
}

button,
code {
  font: inherit;
}

button {
  min-height: 2.85rem;
  border: 1px solid var(--ink);
  padding: 0.72rem 1rem;
  background: var(--ink);
  color: var(--ground);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  cursor: pointer;
}

button.quiet {
  background: transparent;
  color: var(--ink);
}

button:disabled {
  cursor: wait;
  opacity: 0.42;
}

button:not(:disabled):hover {
  background: var(--deep-green);
  border-color: var(--deep-green);
  color: var(--paper);
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--ground);
  transform: translateY(-110%);
}

.skip-link:focus {
  transform: translateY(0);
}

main {
  width: var(--measure);
  margin: 0 auto;
  border-inline: 1px solid var(--ink);
  background: rgba(11, 61, 46, 0.96);
}

.masthead,
.title-grid,
.instrument,
.byte-test,
.instructions,
.source-index,
footer {
  padding-inline: clamp(1rem, 4vw, 3.5rem);
}

.masthead {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1rem;
  align-items: start;
  min-height: 7rem;
  padding-block: 1.2rem;
  border-bottom: 1px solid var(--ink);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.masthead p {
  margin: 0;
}

.wordmark {
  font-size: clamp(0.9rem, 2vw, 1.15rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.folio {
  text-align: right;
}

.title-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(1rem, 4vw, 4rem);
  padding-block: clamp(3rem, 9vw, 7.5rem) clamp(2.5rem, 7vw, 5rem);
}

.kicker,
.eyebrow {
  margin: 0;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  line-height: 1.3;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  margin: -0.12em 0 0;
  font-size: clamp(2.5rem, 8vw, 6.9rem);
  font-weight: 700;
  letter-spacing: -0.072em;
  line-height: 0.87;
}

h1 span {
  display: inline-block;
  padding: 0.04em 0.08em 0.08em;
  background: var(--paper);
  color: var(--ground);
}

.dek {
  grid-column: 2;
  max-width: 42rem;
  margin: 1.5rem 0 0;
  font-size: clamp(0.95rem, 1.8vw, 1.2rem);
  line-height: 1.55;
}

.instrument {
  padding-block: clamp(2rem, 6vw, 4rem);
  border-block: 1px solid var(--ink);
}

.instrument-head {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: flex-start;
}

h2 {
  margin: 0.45rem 0 0;
  font-size: clamp(1.8rem, 4.5vw, 3.8rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.nucleus-mark {
  position: relative;
  display: grid;
  width: clamp(4.3rem, 10vw, 6.5rem);
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--ink);
  padding: 18%;
}

.nucleus-mark::before {
  width: 100%;
  height: 100%;
  border: 1px solid var(--ink);
  content: "";
}

.nucleus-mark span {
  position: absolute;
  width: clamp(1rem, 3vw, 1.7rem);
  aspect-ratio: 1;
  background: var(--green);
}

.timeline {
  display: grid;
  grid-template-columns: minmax(6rem, 0.9fr) 3.1fr;
  margin-top: clamp(2.5rem, 7vw, 5rem);
  border: 1px solid var(--ink);
}

.date-rail {
  display: grid;
  grid-template-rows: 1fr 1fr;
  border-right: 1px solid var(--ink);
}

.date-rail p {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 7rem;
  margin: 0;
  padding: 0.75rem;
  font-size: 0.63rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.date-rail p + p {
  border-top: 1px solid var(--ink);
}

.bands {
  position: relative;
  display: grid;
  grid-template-rows: 1fr 3.5rem 1fr;
  min-width: 0;
  background: repeating-linear-gradient(90deg, transparent 0, transparent calc(20% - 1px), var(--rule) calc(20% - 1px), var(--rule) 20%);
}

.band-row {
  display: grid;
  grid-template-columns: minmax(4.7rem, 0.8fr) minmax(6rem, 2fr) minmax(4.7rem, 0.8fr);
  align-items: center;
  min-height: 7rem;
  padding-inline: clamp(0.5rem, 2vw, 1.5rem);
}

.band-label {
  margin: 0;
  font-size: clamp(0.56rem, 1.3vw, 0.7rem);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.band-label.end {
  text-align: right;
}

.execution-band,
.witness-band {
  display: grid;
  min-height: 2.65rem;
  place-items: center;
  border: 1px solid var(--ink);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.execution-band {
  background: transparent;
}

.witness-band {
  background: var(--green);
  border-color: var(--green);
  color: var(--ground);
}

.night-gap {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.8rem;
  align-items: center;
  padding-inline: clamp(0.5rem, 2vw, 1.5rem);
  border-block: 1px solid var(--rule);
  font-size: 0.54rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.night-gap i {
  border-top: 1px solid var(--ink);
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 1.2rem;
  border: 1px solid var(--ink);
}

.fact-grid div {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 7.5rem;
  padding: 0.75rem;
}

.fact-grid div + div {
  border-left: 1px solid var(--ink);
}

.fact-grid span,
.test-result span,
.test-result small,
.byte-readout span {
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  line-height: 1.35;
  text-transform: uppercase;
}

.fact-grid strong {
  font-size: clamp(1rem, 2.7vw, 1.65rem);
  letter-spacing: -0.035em;
  text-transform: uppercase;
}

.fact-grid .stop-cell {
  background: var(--green);
  color: var(--ground);
}

.boundary {
  max-width: 46rem;
  margin: 1.5rem 0 0 auto;
  font-size: 0.78rem;
  line-height: 1.5;
}

.byte-test {
  display: grid;
  grid-template-columns: 0.5fr 1.5fr 1fr;
  gap: clamp(1rem, 4vw, 3rem);
  padding-block: clamp(3rem, 8vw, 6rem);
  border-bottom: 1px solid var(--ink);
}

.section-number {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.06em;
}

.byte-copy > p:not(.eyebrow) {
  max-width: 34rem;
  font-size: 0.9rem;
  line-height: 1.55;
}

code {
  font-family: "Courier New", monospace;
  font-size: 0.92em;
}

.byte-readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-block: 2rem 1rem;
  border-block: 1px solid var(--ink);
}

.byte-readout p {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0;
  padding: 0.8rem 0.5rem;
}

.byte-readout p + p {
  border-left: 1px solid var(--ink);
}

.byte-readout strong {
  font-family: "Courier New", monospace;
  font-size: 0.85rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.test-result {
  display: flex;
  align-self: end;
  flex-direction: column;
  justify-content: space-between;
  min-height: 16rem;
  padding: 1rem;
  border: 1px solid var(--green);
}

.test-result strong {
  color: var(--green);
  font-family: "Courier New", monospace;
  font-size: clamp(0.76rem, 1.7vw, 1rem);
  line-height: 1.45;
}

.test-result[data-state="failed-as-expected"] {
  background: var(--green);
  color: var(--ground);
}

.test-result[data-state="failed-as-expected"] strong {
  color: inherit;
}

.instructions {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(1rem, 5vw, 4rem);
  padding-block: clamp(3rem, 8vw, 6rem);
  border-bottom: 1px solid var(--ink);
}

.instruction-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--ink);
}

.instruction-columns article {
  padding: clamp(1rem, 3vw, 2rem);
}

.instruction-columns article + article {
  border-left: 1px solid var(--ink);
}

h3 {
  margin: 0 0 1.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

ol {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.84rem;
  line-height: 1.55;
}

li + li {
  margin-top: 0.6rem;
}

.agent-warning {
  margin: 1.5rem 0 0;
  padding-top: 1rem;
  border-top: 5px solid var(--green);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.source-index {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  padding-block: clamp(3rem, 7vw, 5rem);
}

.source-index a {
  display: grid;
  grid-column: 2;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  padding-block: 0.8rem;
  border-top: 1px solid var(--ink);
  font-size: clamp(0.85rem, 1.7vw, 1.05rem);
  font-weight: 700;
  text-decoration: none;
}

.source-index a:last-child {
  border-bottom: 1px solid var(--ink);
}

.source-index a:hover {
  color: var(--green);
}

.source-index a span {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

footer {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  min-height: 9rem;
  padding-block: 1.2rem;
  background: var(--deep-green);
  color: var(--paper);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.45;
  text-transform: uppercase;
}

footer p {
  margin: 0;
}

footer p:last-child {
  text-align: right;
}

@media (max-width: 47rem) {
  body {
    background: var(--ground);
  }

  main {
    width: 100%;
    border: 0;
  }

  .masthead {
    grid-template-columns: 1fr auto;
  }

  .masthead p:not(.folio) {
    display: none;
  }

  .title-grid,
  .instructions,
  .source-index {
    grid-template-columns: 1fr;
  }

  .dek,
  .source-index a {
    grid-column: 1;
  }

  .timeline {
    grid-template-columns: 1fr;
  }

  .date-rail {
    display: none;
  }

  .fact-grid {
    grid-template-columns: 1fr 1fr;
  }

  .fact-grid div:nth-child(3) {
    border-left: 0;
  }

  .fact-grid div:nth-child(n + 3) {
    border-top: 1px solid var(--ink);
  }

  .byte-test {
    grid-template-columns: 0.35fr 1.65fr;
  }

  .test-result {
    grid-column: 2;
    min-height: 11rem;
  }
}

@media (max-width: 34rem) {
  .masthead,
  .title-grid,
  .instrument,
  .byte-test,
  .instructions,
  .source-index,
  footer {
    padding-inline: 0.85rem;
  }

  h1 {
    font-size: clamp(2.5rem, 16vw, 4.3rem);
  }

  .instrument-head {
    align-items: end;
  }

  .nucleus-mark {
    width: 4rem;
    flex: 0 0 4rem;
  }

  .band-row {
    grid-template-columns: 4.7rem 1fr 4.7rem;
    padding-inline: 0.35rem;
  }

  .night-gap {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .night-gap i,
  .night-gap span:last-child {
    display: none;
  }

  .fact-grid,
  .instruction-columns {
    grid-template-columns: 1fr;
  }

  .fact-grid div + div,
  .fact-grid div:nth-child(3),
  .instruction-columns article + article {
    border-top: 1px solid var(--ink);
    border-left: 0;
  }

  .fact-grid div {
    min-height: 5.8rem;
  }

  .byte-test {
    grid-template-columns: 1fr;
  }

  .section-number {
    font-size: 1rem;
  }

  .test-result {
    grid-column: 1;
  }

  .byte-readout {
    grid-template-columns: 1fr;
  }

  .byte-readout p + p {
    border-top: 1px solid var(--ink);
    border-left: 0;
  }

  footer {
    grid-template-columns: 1fr;
  }

  footer p:last-child {
    text-align: left;
  }
}

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

@media print {
  html,
  body {
    background: var(--ground) !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  main {
    width: 100%;
    border: 0;
    background: var(--ground) !important;
  }

  button,
  .skip-link {
    display: none;
  }
}