:root {
  --ink: #141a27;
  --muted: #4d586b;
  --paper: #e7edf4;
  --sheet: #f7f9fc;
  --line: #c9d3e2;
  --navy: #121826;
  --brick: #c8342a;
  --brick-ink: #fff8f6;
  --teal: #0e5c62;
  --focus: #0b4f8a;
  --sans: "Trebuchet MS", "Segoe UI", sans-serif;
  --max: 74rem;
  --rail: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

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

section {
  scroll-margin-top: 5.5rem;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.65;
}

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

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

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

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  z-index: 20;
  padding: 0.5rem 0.8rem;
  background: var(--navy);
  color: #fff;
  transform: translateY(-160%);
}

.skip:focus {
  transform: none;
}

.frame {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  min-height: 100vh;
}

.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  background: var(--navy);
  color: #d5deea;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.rail-mark {
  width: 2rem;
  height: 2rem;
}

.rail-date {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.rail-age {
  margin: 0;
  font-size: 0.75rem;
  color: #f0c7c3;
}

.site-head {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  background: rgba(247, 249, 252, 0.94);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  min-height: 2.75rem;
}

.brand img {
  width: 32px;
  height: 32px;
}

.menu-btn {
  display: none;
  min-height: 48px;
  min-width: 48px;
  border: 1px solid var(--line);
  background: var(--sheet);
  color: var(--ink);
  font: inherit;
  padding: 0 0.9rem;
}

.section-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem 1rem;
}

.section-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
}

.section-nav a:hover {
  color: var(--brick);
}

.nav-go {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 1rem;
  background: var(--brick);
  color: var(--brick-ink);
  text-decoration: none;
  font-weight: 700;
}

.nav-go:hover {
  background: #a62820;
  color: var(--brick-ink);
}

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

.mast {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(16rem, 0.8fr);
  gap: 1.5rem;
  padding: 2.2rem 0 2.6rem;
  align-items: start;
}

.kicker {
  margin: 0 0 0.6rem;
  color: var(--teal);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  max-width: 22ch;
}

.lead,
.folio p,
.caution p,
.policy p,
.colophon p {
  margin: 0 0 0.9rem;
}

.short {
  margin: 0 0 0.9rem;
  font-weight: 700;
  color: var(--navy);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  min-height: 48px;
  margin: 1.1rem 0 0.4rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  min-width: 11.5rem;
  padding: 0 1.1rem;
  background: var(--brick);
  color: var(--brick-ink);
  text-decoration: none;
  font-weight: 700;
}

.btn:hover {
  background: #a62820;
  color: var(--brick-ink);
}

.btn-line {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}

.btn-line:hover {
  background: var(--navy);
  color: #fff;
}

.slip {
  background: var(--navy);
  color: #e6edf6;
  padding: 1.15rem 1.15rem 1.25rem;
  min-height: 22rem;
}

.slip-label {
  margin: 0 0 0.8rem;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #f0c7c3;
}

.slip dl {
  margin: 0;
}

.slip dl div {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.5rem;
  padding: 0.55rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.slip dt {
  color: #a9b6c9;
}

.slip dd {
  margin: 0;
}

.slip-note {
  margin: 0.9rem 0 0;
  color: #d5deea;
  font-size: 0.92rem;
}

.folio {
  padding: 2.4rem 0;
  border-top: 1px solid var(--line);
}

.folio h2,
.caution h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.folio-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(16rem, 0.9fr);
  gap: 1.5rem;
  align-items: start;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--sheet);
  border: 1px solid var(--line);
}

.steps li {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.7rem;
  padding: 0.9rem 1rem;
  border-top: 1px solid var(--line);
}

.steps li:first-child {
  border-top: 0;
}

.steps span {
  color: var(--brick);
  font-weight: 700;
}

.lane {
  display: grid;
  gap: 0.9rem;
}

.lane article {
  background: var(--sheet);
  border-left: 4px solid var(--teal);
  padding: 0.9rem 1rem 0.2rem;
  min-height: 8.5rem;
}

.lane h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
}

.diagram {
  margin: 1.2rem 0 0;
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 0.8rem;
}

.diagram figcaption {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.meters {
  width: 100%;
  border-collapse: collapse;
  background: var(--sheet);
}

.meters th,
.meters td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--line);
}

.meters th {
  width: 9.5rem;
  color: var(--teal);
}

.caption {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.caution {
  margin: 0 0 2rem;
  padding: 1.3rem 1.2rem 0.5rem;
  background: #f8ebe8;
  border: 1px solid #e4c2bc;
}

.policy {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding-bottom: 2.4rem;
}

.policy h2 {
  margin: 0 0 0.7rem;
  font-size: 1.35rem;
}

.colophon {
  background: var(--navy);
  color: #d5deea;
  padding: 2rem 0 1.4rem;
}

.colophon a {
  color: #f3d2ce;
}

.colophon h2 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #fff;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 0.9fr;
  gap: 1.4rem;
}

.colophon ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.colophon li {
  margin: 0 0 0.35rem;
}

.stamp {
  margin: 1.2rem 0 0;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.92rem;
}

@media (max-width: 860px) {
  .frame {
    grid-template-columns: 1fr;
  }

  .rail {
    position: static;
    height: auto;
    flex-direction: row;
    padding: 0.45rem 0.9rem;
  }

  .rail-date {
    writing-mode: horizontal-tb;
    transform: none;
    letter-spacing: 0.06em;
  }

  .menu-btn {
    display: inline-flex;
    align-items: center;
  }

  .section-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--sheet);
    border-bottom: 1px solid var(--line);
    padding: 0.4rem 0.9rem 0.9rem;
  }

  .section-nav.is-open {
    display: flex;
  }

  .section-nav a {
    padding: 0.75rem 0.2rem;
    border-top: 1px solid var(--line);
  }

  .nav-go {
    margin-top: 0.4rem;
  }

  .site-head {
    position: sticky;
  }

  .mast,
  .folio-grid,
  .policy,
  .foot-grid {
    grid-template-columns: 1fr;
  }

  .slip {
    min-height: 0;
  }
}

@media (max-width: 520px) {
  .slip dl div {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .btn,
  .nav-go {
    width: 100%;
  }
}