:root {
  --spine: #12100e;
  --spine-2: #1c1916;
  --spine-ink: #f4f0e7;
  --spine-muted: #c9c0b2;
  --nitro: #e54812;
  --paper: #f3efe6;
  --paper-2: #e7e0d2;
  --ink: #1b1814;
  --muted: #534d44;
  --line: #d5ccbc;
  --link: #7d2a0e;
  --header: 4.25rem;
  --measure: 68ch;
  --sans: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --display: Bahnschrift, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: Consolas, "Cascadia Mono", "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
}

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

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

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

a:hover {
  color: #5c1d09;
}

:focus-visible {
  outline: 2px solid var(--nitro);
  outline-offset: 3px;
}

::selection {
  background: #1b1814;
  color: #f4f0e7;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  z-index: 40;
  transform: translateY(-160%);
  background: #fff;
  color: #1b1814;
  padding: 0.5rem 0.8rem;
}

.skip:focus {
  transform: none;
}

.site-header {
  background: var(--spine);
  color: var(--spine-ink);
  position: sticky;
  top: 0;
  z-index: 30;
}

.bar {
  min-height: var(--header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--spine-ink);
  text-decoration: none;
  font-family: var(--display);
  font-weight: 650;
  letter-spacing: 0.01em;
  min-height: 2.75rem;
}

.brand img {
  width: 36px;
  height: 36px;
}

.nav-toggle {
  min-height: 2.75rem;
  min-width: 5.5rem;
  border: 1px solid #3a342c;
  background: var(--spine-2);
  color: var(--spine-ink);
  font: inherit;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
}

.site-nav {
  display: none;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.35rem 0.85rem 1rem;
  background: var(--spine);
  border-top: 1px solid #2a261f;
}

.site-nav.is-open {
  display: flex;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
}

.site-nav a {
  color: var(--spine-muted);
  text-decoration: none;
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.35rem 0.55rem;
}

.site-nav a span {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--nitro);
  width: 1.6rem;
}

.site-nav a[aria-current="true"] {
  color: var(--spine-ink);
  box-shadow: inset 3px 0 0 var(--nitro);
}

.spine-note {
  display: none;
  margin: 0;
  padding: 1rem 1.25rem 1.25rem;
  color: var(--spine-muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.55rem 1.15rem;
  background: #1b1814;
  color: #fff;
  text-decoration: none;
  border-left: 3px solid var(--nitro);
  font-family: var(--display);
  font-weight: 650;
  line-height: 1.2;
}

.site-nav .cta {
  margin-top: 0.45rem;
  background: #c7370c;
  color: #fff;
  box-shadow: none;
}

.cta:hover {
  background: #c7370c;
  color: #fff;
}

.wrap {
  width: min(72rem, calc(100% - 2rem));
  margin-inline: auto;
}

main section {
  padding: 2.5rem 0 0.5rem;
  scroll-margin-top: 5.2rem;
}

.hero {
  padding-bottom: 1.5rem;
}

.kicker {
  margin: 0 0 0.6rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nitro);
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 650;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.8rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.35rem);
  max-width: 16ch;
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  max-width: 22ch;
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.4rem;
}

p {
  max-width: var(--measure);
  margin: 0 0 0.95rem;
}

.lede {
  font-size: 1.12rem;
}

.hero-actions {
  margin-top: 1.2rem;
}

.hero-actions .cta {
  min-width: 14rem;
}

#address-guide,
#platform-features {
  background: linear-gradient(180deg, transparent, rgba(215, 204, 188, 0.35) 8%, rgba(215, 204, 188, 0.35) 92%, transparent);
}

.diagram {
  margin: 1.4rem 0 1.6rem;
  max-width: 40rem;
}

.diagram img {
  width: 100%;
  height: auto;
  background: var(--spine);
  aspect-ratio: 640 / 360;
}

.diagram figcaption {
  margin-top: 0.45rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.steps {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  max-width: 46rem;
}

.steps li {
  display: grid;
  grid-template-columns: 2.6rem 1fr;
  gap: 0.75rem;
  border-top: 1px solid var(--line);
  padding: 0.95rem 0;
}

.steps span {
  font-family: var(--mono);
  color: var(--nitro);
  padding-top: 0.15rem;
}

.steps h3 {
  margin-top: 0;
}

.table-wrap {
  max-width: 46rem;
  overflow-x: auto;
  margin: 1rem 0 1.2rem;
}

.spec {
  width: 100%;
  border-collapse: collapse;
  min-width: 28rem;
}

.spec caption {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.spec th,
.spec td {
  text-align: left;
  vertical-align: top;
  padding: 0.75rem 0.6rem 0.75rem 0;
  border-bottom: 1px solid var(--line);
  font-weight: 450;
}

.spec thead th {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.notice {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  margin-bottom: 1rem;
  background: #f7f1df;
}

.site-footer {
  background: var(--paper);
  padding: 1rem 0 3rem;
}

.site-footer h2 {
  font-size: 1.35rem;
}

.foot-meta {
  border-top: 1px solid var(--line);
  margin-top: 1.5rem;
  padding-top: 1rem;
}

.foot-meta ul {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.1rem;
}

.foot-meta a {
  color: var(--ink);
}

.age {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--display);
  font-weight: 700;
  margin: 0.4rem 0 0;
}

@media (min-width: 64rem) {
  body {
    display: grid;
    grid-template-columns: 17.5rem minmax(0, 1fr);
    grid-template-rows: auto auto;
    min-height: 100vh;
  }

  .site-header {
    position: sticky;
    top: 0;
    height: 100vh;
    grid-row: 1 / span 2;
    display: flex;
    flex-direction: column;
    padding: 1.25rem 1rem 1rem;
  }

  .bar {
    padding: 0.2rem 0.4rem 1rem;
    min-height: 3.5rem;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav,
  .site-nav.is-open {
    display: flex;
    position: static;
    border-top: 0;
    padding: 0.4rem 0;
    flex: 1;
  }

  .spine-note {
    display: block;
  }

  main {
    grid-column: 2;
  }

  .site-footer {
    grid-column: 2;
  }

  main section {
    padding-top: 3.25rem;
    scroll-margin-top: 1.25rem;
  }

  .hero {
    min-height: calc(100vh - 4rem);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: 2rem;
    padding-bottom: 2rem;
  }
}

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