:root {
  --primary: #1B1B2F;
  --accent: #B8860B;
  --surface: #FAF7F0;
  --text: #1A1A1A;
  --muted: #6b6355;
  --border: rgba(27,27,47,.18);
  --radius: 2px;
  --shadow: 0 1px 0 rgba(27,27,47,.06);
  --serif: Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --measure: 34rem;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font: 400 1.0625rem/1.7 var(--serif);
  padding-bottom: 3rem;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration-color: var(--accent); text-underline-offset: .18em; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.18; color: var(--primary); }
h1 { font-size: clamp(2rem, 6vw, 3.1rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.4rem, 3.4vw, 1.85rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1.1rem; }

.masthead-bar {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.masthead-body {
  max-width: 72rem; margin: 0 auto;
  padding: .9rem 1.25rem;
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: .5rem 1.25rem;
}
.masthead-name {
  font: 700 1.05rem/1 var(--serif);
  letter-spacing: .16em; text-transform: uppercase;
  color: var(--primary); text-decoration: none;
}
.masthead-nav { display: none; }
.masthead-list { display: flex; flex-wrap: wrap; gap: 1.1rem; list-style: none; margin: 0; padding: 0; }
.masthead-link { font: 400 .9rem/1 var(--sans); letter-spacing: .05em; text-transform: uppercase; text-decoration: none; color: var(--primary); }
.masthead-link[aria-current="page"] { border-bottom: 2px solid var(--accent); }
.masthead-trigger {
  font: 400 .85rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase;
  background: none; border: 1px solid var(--primary); border-radius: var(--radius);
  color: var(--primary); padding: .5rem .8rem; cursor: pointer;
}
.masthead-open .masthead-nav { display: block; flex-basis: 100%; padding: .6rem 0 0; }
.masthead-open .masthead-list { flex-direction: column; gap: .35rem; }

.crumb-bar { max-width: 72rem; margin: 1.25rem auto 0; padding: 0 1.25rem; }
.breadcrumb__list { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; margin: 0; padding: 0; font: 400 .78rem/1.4 var(--sans); color: var(--muted); }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; margin-right: .4rem; color: var(--border); }
.breadcrumb__link { color: var(--muted); text-decoration: none; }
.breadcrumb__link:hover { color: var(--accent); }
.breadcrumb__item[aria-current="page"] { color: var(--primary); }

.intro-cols { max-width: 72rem; margin: 0 auto; padding: 2.5rem 1.25rem 0; display: grid; gap: 2rem; }
.intro-copy { max-width: var(--measure); }
.intro-kicker { font: 400 .8rem/1 var(--sans); letter-spacing: .22em; text-transform: uppercase; color: var(--accent); margin: 0 0 .9rem; }
.intro-title { margin: 0 0 1rem; }
.intro-text { color: var(--muted); font-size: 1.1rem; }
.intro-link {
  display: inline-block; margin-top: .4rem;
  font: 400 .85rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase;
  padding: .7rem 1.1rem; border: 1px solid var(--primary); border-radius: var(--radius);
  color: var(--primary); text-decoration: none;
}
.intro-link:hover { background: var(--primary); color: var(--surface); }
.intro-figure { margin: 0; }
.intro-frame { border-radius: var(--radius); box-shadow: var(--shadow); background: #e9e3d7; min-height: 22rem; }
.intro-frame img { width: 100%; aspect-ratio: 2 / 3; object-fit: cover; border-radius: var(--radius); opacity: 0; transition: opacity .5s ease; }
.intro-frame img.media-ready { opacity: 1; }
.intro-caption { margin: .7rem 0 0; font: 400 .8rem/1.5 var(--sans); color: var(--muted); }

.flow-block { border-top: 1px solid var(--border); margin-top: 3rem; padding-top: 2rem; }
.flow-body { max-width: var(--measure); margin: 0 auto; padding: 0 1.25rem; }
.flow-title { margin: 0 0 1rem; }
.flow-quote {
  margin: 2rem 0; padding: 0 0 0 1.2rem;
  border-left: 3px solid var(--accent);
  font-size: 1.25rem; font-style: italic; color: var(--primary);
}
.flow-quote p { margin: 0 0 .6rem; }
.flow-cite { display: block; font: 400 .8rem/1.4 var(--sans); font-style: normal; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.term-list { margin: 0 0 1.2rem; }
.term-list dt { font-weight: 700; color: var(--primary); margin-top: 1rem; }
.term-list dd { margin: .2rem 0 0; color: var(--muted); }
.step-list { margin: 0 0 1.2rem; padding-left: 1.3rem; }
.step-list li { margin-bottom: .55rem; }
.step-list li::marker { color: var(--accent); font-family: var(--sans); }

.ask-item { border-bottom: 1px solid var(--border); }
.ask-query {
  cursor: pointer; padding: .95rem 0;
  font: 700 1.02rem/1.4 var(--serif); color: var(--primary);
  list-style: none; display: flex; justify-content: space-between; gap: 1rem;
}
.ask-query::-webkit-details-marker { display: none; }
.ask-query::after { content: "+"; font-family: var(--sans); color: var(--accent); }
.ask-item[open] .ask-query::after { content: "\2212"; }
.ask-reply { margin: 0 0 1.1rem; color: var(--muted); }

.foot-body { max-width: 72rem; margin: 3.5rem auto 0; padding: 2.5rem 1.25rem 0; border-top: 1px solid var(--border); text-align: center; }
.foot-name { font: 700 1rem/1 var(--serif); letter-spacing: .18em; text-transform: uppercase; color: var(--primary); margin: 0 0 .8rem; }
.foot-list { display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem 1.4rem; list-style: none; margin: 0 0 1.4rem; padding: 0; }
.foot-link { font: 400 .85rem/1.4 var(--sans); color: var(--muted); text-decoration: none; }
.foot-link:hover { color: var(--accent); }
.foot-legal { font: 400 .78rem/1.6 var(--sans); color: var(--muted); margin: 0; }

.climb-link {
  position: fixed; right: 1rem; bottom: 1rem;
  display: none; padding: .55rem .7rem;
  font: 400 .8rem/1 var(--sans);
  background: var(--primary); color: var(--surface);
  border: 1px solid var(--primary); border-radius: var(--radius);
  text-decoration: none;
}
.climb-link.is-shown { display: block; }

@media (min-width: 60rem) {
  .masthead-trigger { display: none; }
  .masthead-nav { display: block; }
  .intro-cols { grid-template-columns: minmax(0, 1fr) 20rem; align-items: start; gap: 3.5rem; padding-top: 3.5rem; }
  .intro-figure { grid-column: 2; grid-row: 1 / span 2; }
  .intro-copy { grid-column: 1; }
  .intro-frame img { aspect-ratio: 3 / 5; }
  .flow-block { margin-top: 4.5rem; padding-top: 3rem; }
}