:root {
  --paper: #f4efe4;
  --paper-2: #e8e0d0;
  --ink: #1b1814;
  --muted: #5c564c;
  --line: #d2c7b4;
  --oxide: #8d3b2c;
  --oxide-deep: #6e2d22;
  --pine: #1e3f3b;
  --pine-soft: #d7e6e1;
  --stamp: #b08958;
  --focus: #1e3f3b;
  --serif: "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Segoe UI", Tahoma, sans-serif;
  --mono: Consolas, "Courier New", monospace;
  --max: 68rem;
  --pad: clamp(1rem, 3vw, 1.75rem);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

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

  * {
    animation: none !important;
    transition: none !important;
  }
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, var(--oxide) 0 0.45rem, transparent 0.45rem),
    var(--paper);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.65;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

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

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  transform: translateY(-150%);
  background: var(--ink);
  color: var(--paper);
  padding: 0.55rem 0.8rem;
  z-index: 20;
}

.skip:focus {
  transform: none;
}

.mast {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
  padding: 0.75rem var(--pad);
  background: rgba(244, 239, 228, 0.96);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
  min-height: 2.75rem;
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

.brand-name small {
  display: block;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0.4rem;
  display: none;
  position: absolute;
  top: 100%;
  right: var(--pad);
  left: var(--pad);
  background: var(--paper);
  border: 1px solid var(--line);
}

.nav-list.is-open {
  display: grid;
}

.nav-list a {
  display: block;
  padding: 0.7rem 0.8rem;
  color: inherit;
  text-decoration: none;
}

.nav-list a[aria-current="true"] {
  background: var(--pine-soft);
}

.sheet {
  width: min(var(--max), calc(100% - (var(--pad) * 2)));
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
}

.hero {
  display: grid;
  gap: 1.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.kicker {
  margin: 0 0 0.8rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--oxide-deep);
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(2rem, 5vw, 3.35rem);
}

.lead {
  margin: 0;
  max-width: 38rem;
  font-size: 1.12rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem 1rem;
  min-height: 3.25rem;
  margin-top: 1.35rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.7rem 1.15rem;
  background: var(--pine);
  color: #f7f4ee;
  text-decoration: none;
  font-weight: 600;
}

.btn:hover {
  background: #16332f;
}

.quiet {
  color: var(--muted);
  font-size: 0.92rem;
}

.card {
  margin: 0;
  background: #fbf8f2;
  border: 1px solid var(--line);
  padding: 1rem;
}

.card img {
  width: 100%;
  height: auto;
  aspect-ratio: 560 / 420;
}

.card figcaption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.chapter {
  display: grid;
  gap: 0.4rem;
  padding: 2.2rem 0;
  border-bottom: 1px solid var(--line);
}

.index {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--stamp);
}

h2 {
  margin: 0 0 0.9rem;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
}

h3 {
  margin: 1.4rem 0 0.4rem;
  font-size: 1.25rem;
}

p {
  margin: 0 0 0.9rem;
}

.steps {
  margin: 0.4rem 0 1rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  align-items: start;
  padding-top: 0.65rem;
  border-top: 1px solid var(--line);
}

.steps span {
  font-family: var(--mono);
  color: var(--oxide);
}

.note {
  margin: 1rem 0 0;
  padding: 0.9rem 1rem;
  background: var(--pine-soft);
}

.metrics {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.metrics li {
  padding: 0.85rem 0.9rem;
  background: #fbf8f2;
  border-left: 0.35rem solid var(--oxide);
}

.metrics strong {
  display: block;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}

.legal {
  background: #efe7d8;
  margin-top: 0.5rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
}

.site-footer {
  padding: 1.5rem var(--pad) 2.5rem;
  background: var(--pine);
  color: #e7f0ed;
}

.site-footer a {
  color: #f3e2c4;
}

.foot-grid {
  width: min(var(--max), 100%);
  margin: 0 auto;
  display: grid;
  gap: 1.2rem;
}

.site-footer h2 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  color: #fff;
}

.site-footer p,
.site-footer li {
  color: #d5e3df;
  font-size: 0.95rem;
}

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

.updated {
  margin-top: 1.2rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: #f3e2c4;
}

@media (min-width: 760px) {
  .nav-toggle {
    display: none;
  }

  .nav-list,
  .nav-list.is-open {
    display: flex;
    position: static;
    gap: 0.2rem;
    padding: 0;
    border: 0;
    background: transparent;
  }

  .hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
  }

  .chapter {
    grid-template-columns: 4.5rem 1fr;
    gap: 1rem;
  }

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

  .foot-grid {
    grid-template-columns: 1.3fr 0.8fr 0.9fr;
  }
}