:root {
  --field: #e7edf2;
  --sheet: #f8fafc;
  --ink: #152033;
  --muted: #4e5d72;
  --line: #c9d4e0;
  --navy: #16324f;
  --navy-deep: #0e2238;
  --amber: #e3a008;
  --amber-ink: #1c1403;
  --header: 4.5rem;
  --measure: 68ch;
  --wrap: 72rem;
  --sans: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --display: Bahnschrift, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--field);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--navy);
}

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

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  transform: translateY(-150%);
  background: var(--amber);
  color: var(--amber-ink);
  padding: 0.5rem 0.75rem;
  z-index: 20;
}

.skip:focus {
  transform: none;
}

.wrap {
  width: min(var(--wrap), calc(100% - 2rem));
  margin-inline: auto;
}

.site-head {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header);
  background: var(--sheet);
  border-bottom: 3px solid var(--amber);
}

.head-bar {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--navy-deep);
  text-decoration: none;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.menu-btn {
  margin-left: auto;
  min-height: 2.75rem;
  min-width: 5.5rem;
  border: 1px solid var(--line);
  background: var(--sheet);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

.section-nav {
  display: none;
  position: absolute;
  top: var(--header);
  left: 0;
  right: 0;
  background: var(--sheet);
  border-bottom: 1px solid var(--line);
  padding: 0.75rem 1rem 1rem;
}

.section-nav.is-open {
  display: grid;
  gap: 0.35rem;
}

.section-nav a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0 0.35rem;
  color: var(--ink);
  text-decoration: none;
}

.section-nav a[aria-current="page"],
.nav-go {
  font-weight: 650;
}

.nav-go {
  color: var(--amber-ink);
  background: var(--amber);
  justify-content: center;
  text-decoration: none;
}

.band {
  background:
    linear-gradient(180deg, rgba(227, 160, 8, 0.08), transparent 28%),
    repeating-linear-gradient(90deg, transparent 0 55px, rgba(255, 255, 255, 0.035) 55px 56px),
    var(--navy-deep);
  color: #f4f7fb;
  padding: 2.5rem 0 2.75rem;
}

.band a {
  color: inherit;
}

.kicker {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--amber);
}

h1,
h2,
h3 {
  font-family: var(--display);
  line-height: 1.15;
  font-weight: 650;
}

h1 {
  margin: 0 0 1rem;
  max-width: 18em;
  font-size: clamp(2rem, 4.4vw, 3.35rem);
}

.lede,
.band p {
  max-width: var(--measure);
  color: #d5deea;
}

.lede {
  font-size: 1.15rem;
}

.band-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin: 1.5rem 0 1.75rem;
  min-height: 3.25rem;
}

.go {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  min-width: 14rem;
  padding: 0.7rem 1.25rem;
  background: var(--amber);
  color: var(--amber-ink);
  text-decoration: none;
  font-weight: 700;
}

.go-quiet {
  color: #f4f7fb;
  min-height: 3.25rem;
  display: inline-flex;
  align-items: center;
}

.facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.facts li {
  min-height: 5.25rem;
  margin: 0;
  padding: 0.75rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.04);
}

.facts span {
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--amber);
}

.facts strong {
  display: block;
  margin-top: 0.25rem;
  font-weight: 650;
}

.sheet {
  padding: 2.75rem 0;
  scroll-margin-top: calc(var(--header) + 0.75rem);
}

.sheet h2 {
  margin: 0.35rem 0 1rem;
  font-size: clamp(1.6rem, 2.5vw, 2.15rem);
}

.eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9a3412;
}

.rule {
  width: 3rem;
  height: 3px;
  background: var(--amber);
  border: 0;
  margin: 0 0 0.85rem;
}

.sheet p {
  max-width: var(--measure);
}

.steps {
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
  max-width: 46rem;
}

.steps li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.75rem;
  min-height: 4.5rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
}

.steps li:last-child {
  border-bottom: 1px solid var(--line);
}

.steps li > span:first-child {
  font-family: var(--mono);
  color: #9a3412;
}

.signal {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0 0.5rem;
  background: var(--sheet);
}

.signal th,
.signal td {
  text-align: left;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  vertical-align: top;
}

.signal th {
  background: var(--navy-deep);
  color: #f4f7fb;
  font-weight: 650;
}

.signal caption {
  caption-side: bottom;
  text-align: left;
  padding-top: 0.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.flow {
  margin: 1.5rem 0;
}

.flow img {
  width: min(100%, 720px);
  height: auto;
  background: var(--sheet);
  border: 1px solid var(--line);
}

.methods {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.25rem;
}

.method {
  background: var(--sheet);
  border-left: 4px solid var(--navy);
  padding: 1rem 1rem 0.35rem;
  min-height: 9rem;
}

.method h3 {
  margin: 0 0 0.4rem;
  font-size: 1.2rem;
}

.spec {
  margin: 1.25rem 0 0;
  max-width: 46rem;
}

.spec div {
  display: grid;
  gap: 0.2rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
}

.spec div:last-child {
  border-bottom: 1px solid var(--line);
}

.spec dt {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--navy);
}

.spec dd {
  margin: 0;
}

.notice {
  background: #f3efe4;
  border-top: 1px solid #e3d7bc;
}

.notice .wrap {
  border-left: 4px solid #9a3412;
  padding-left: 1rem;
}

.colophon {
  background: var(--navy-deep);
  color: #d5deea;
  padding: 2.5rem 0 2rem;
}

.colophon a {
  color: #f4f7fb;
}

.foot-grid {
  display: grid;
  gap: 1.5rem;
}

.colophon h2 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--amber);
}

.fine {
  font-size: 0.95rem;
  color: #c5d0dc;
}

.foot-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.foot-links a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
}

@media (min-width: 760px) {
  .facts {
    grid-template-columns: repeat(4, 1fr);
  }

  .methods {
    grid-template-columns: repeat(3, 1fr);
  }

  .foot-grid {
    grid-template-columns: 1.2fr 1.2fr 0.8fr;
    gap: 2rem;
  }
}

@media (min-width: 960px) {
  .menu-btn {
    display: none;
  }

  .section-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: auto;
    border: 0;
    padding: 0;
    background: transparent;
  }

  .section-nav a {
    padding: 0 0.7rem;
  }

  .nav-go {
    margin-left: 0.4rem;
    min-width: 8.5rem;
  }

  .spec div {
    grid-template-columns: 11rem 1fr;
    gap: 1rem;
    align-items: baseline;
  }
}

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