:root {
  color-scheme: light;
  --ink: #17283b;
  --muted: #465970;
  --paper: #f6f8fb;
  --line: #d9e1eb;
  --accent: #174fa3;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 1rem; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}
a { color: var(--accent); text-underline-offset: .2em; }
a:focus-visible {
  outline: 3px solid #9a4d00;
  outline-offset: 5px;
}
.wrap { width: min(1100px, calc(100% - 2.5rem)); margin-inline: auto; }
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: .75rem 1rem;
  background: white;
  z-index: 10;
}
.skip-link:focus { top: 1rem; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--line);
}
.brand {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-decoration: none;
  color: var(--ink);
}
nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }
nav a { font-size: .95rem; }
.hero { padding-block: 5rem 3rem; }
.eyebrow, .label {
  color: var(--accent);
  font-size: 1.05rem;
  font-weight: 750;
  letter-spacing: .07em;
  text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.2; }
h1 {
  max-width: 950px;
  margin: 1rem 0 1.5rem;
  font-size: clamp(2.25rem, 5.5vw, 4rem);
  letter-spacing: -.035em;
}
h2 { font-size: clamp(1.65rem, 3vw, 2.25rem); margin: .6rem 0 1.5rem; }
h3 { font-size: 1.2rem; }
p { margin-block: .75rem; }
.intro { max-width: 760px; font-size: 1.2rem; color: var(--muted); }
.small { font-size: .9rem; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.5rem; margin-block: 2rem; }
.button {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: .85rem 1.2rem;
  border-radius: .5rem;
  text-decoration: none;
  font-weight: 650;
}
.button:hover { background: #103b7c; }
.section { padding-block: 2.5rem; }
.section-intro { max-width: 800px; color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.card { padding: 1.5rem; background: white; border: 1px solid var(--line); border-radius: .75rem; }
.card h3 { margin-top: 0; }
.card p { color: var(--muted); }
.steps { padding-left: 1.5rem; max-width: 850px; }
.steps li { padding-left: .5rem; margin-bottom: 1.5rem; }
.steps h3 { margin-bottom: .4rem; }
.steps p { color: var(--muted); }
.brief { margin-top: 2rem; background: white; border: 1px solid var(--line); border-radius: 1rem; overflow: hidden; }
.brief-header { padding: 2rem; background: #eaf0f9; }
.brief-header h3 { font-size: 1.6rem; margin-block: .5rem; }
.brief-details { margin: 0; }
.brief-details > div {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 1.5rem;
  padding: 1.3rem 2rem;
  border-top: 1px solid var(--line);
}
dt { font-weight: 700; }
dd { margin: 0; overflow-wrap: anywhere; }
.constraint { background: #fff4e5; border-left: 5px solid #9a4d00; }
.boundary-list { max-width: 850px; padding-left: 1.4rem; }
.boundary-list li { margin-bottom: .75rem; }
.contact-panel { padding: 2rem; border: 1px solid var(--line); border-radius: 1rem; background: white; }
.site-footer { border-top: 1px solid var(--line); padding-block: 2rem; }
@media (max-width: 720px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: .75rem; }
  nav { gap: 1rem; }
  .hero { padding-top: 3rem; }
  .grid { grid-template-columns: 1fr; }
  .brief-header, .contact-panel { padding: 1.25rem; }
  .brief-details > div { grid-template-columns: 1fr; gap: .5rem; padding: 1.25rem; }
}

/* Reader-focused branding and example labels */
.brand {
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  line-height: 1.35;
  letter-spacing: 0;
  max-width: 28rem;
}
.walkthrough-notice { padding-top: 1.5rem; }
code { overflow-wrap: anywhere; }