:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #4a5c70;
  --navy: #102f50;
  --blue: #075f9f;
  --line: #d7e0ea;
  --canvas: #eef3f8;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  padding: 32px 20px;
  background: var(--canvas);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

.article {
  max-width: 920px;
  margin: 0 auto;
  padding: 62px 70px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 18px 50px rgba(26, 54, 93, .10);
}

.article-header { margin-bottom: 6px; }

.eyebrow {
  margin: 0 0 13px;
  color: #145da0;
  font-size: 13px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 18px;
  color: var(--navy);
  font-size: 42px;
  line-height: 1.13;
  letter-spacing: -.025em;
}

h2 {
  margin: 42px 0 13px;
  padding-top: 24px;
  color: #123f69;
  font-size: 25px;
  line-height: 1.25;
  border-top: 1px solid #dce5ee;
}

h3 {
  margin: 27px 0 9px;
  color: #173d63;
  font-size: 19px;
  line-height: 1.35;
}

p,
li {
  color: #27384a;
  font-size: 17px;
  line-height: 1.68;
}

p { margin: 0 0 15px; }

ul,
ol {
  margin: 8px 0 20px;
  padding-left: 27px;
}

li {
  margin: 0 0 10px;
  padding-left: 4px;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  overflow-wrap: anywhere;
}

a:hover { color: #003c68; }

a:focus-visible {
  outline: 3px solid #f2b84b;
  outline-offset: 3px;
  border-radius: 2px;
}

strong { color: #172b40; }

.diagram {
  margin: 30px 0 36px;
  padding: 15px;
  background: #f7fafc;
  border: 1px solid #ccd8e4;
  border-radius: 12px;
}

.diagram picture { display: block; }

.diagram img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 5px;
}

.diagram figcaption {
  margin: 12px 5px 2px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.footer {
  margin-top: 42px;
  padding-top: 22px;
  color: #536477;
  font-size: 14px;
  line-height: 1.5;
  border-top: 1px solid #e2e8f0;
}

@media (max-width: 680px) {
  body {
    padding: 0;
    background: #fff;
  }

  .article {
    width: 100%;
    padding: 32px 21px 44px;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  h1 {
    font-size: 33px;
    line-height: 1.16;
  }

  h2 {
    margin-top: 35px;
    font-size: 23px;
  }

  h3 { font-size: 19px; }

  p,
  li {
    font-size: 16.5px;
    line-height: 1.62;
  }

  ul,
  ol { padding-left: 23px; }

  .diagram {
    margin-left: -5px;
    margin-right: -5px;
    padding: 8px;
  }

  .diagram figcaption { font-size: 14px; }
}