:root {
  --ink: #111820;
  --navy: #1a2e4a;
  --blue: #315a85;
  --blue-soft: #e9f0f7;
  --mist: #f3f6f8;
  --rule: #d5dce3;
  --muted: #5a6672;
  --white: #ffffff;
  --max: 1320px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  transform: translateY(-160%);
  border-radius: 4px;
  background: var(--navy);
  color: var(--white);
  font-size: 14px;
  font-weight: 750;
}

.skip-link:focus {
  transform: translateY(0);
}

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

a:hover {
  color: var(--navy);
}

a:focus-visible {
  outline: 3px solid rgba(49, 90, 133, 0.38);
  outline-offset: 4px;
  border-radius: 2px;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 0 max(28px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(213, 220, 227, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--navy);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand img {
  display: block;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-header nav a {
  color: #273544;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

main {
  padding: 58px 28px 88px;
}

.article-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 850px);
  gap: 76px;
  width: min(100%, 1166px);
  margin: 0 auto;
  align-items: start;
}

.toc-panel {
  position: sticky;
  top: 106px;
  max-height: calc(100vh - 132px);
  overflow: auto;
  padding: 20px 18px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fbfcfd;
}

.toc-label {
  margin: 0 0 13px;
  color: var(--navy);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

.toc-panel li {
  margin: 0;
}

.toc-panel > ul > li > a {
  display: none;
}

.toc-panel > ul > li > ul {
  display: block;
  margin: 0;
  padding: 0;
}

.toc-panel a {
  display: block;
  padding: 5px 0;
  color: #566372;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.42;
  text-decoration: none;
}

.toc-panel a:hover {
  color: var(--blue);
}

.article {
  min-width: 0;
}

.breadcrumbs {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li {
  margin: 0;
  padding: 0;
}

.breadcrumbs li + li::before {
  margin-right: 7px;
  color: #98a3ae;
  content: "/";
}

.breadcrumbs a {
  color: var(--muted);
}

.article-kicker {
  margin-bottom: 17px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.16em;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 550;
}

h1,
h2,
h3 {
  color: var(--navy);
  line-height: 1.08;
  letter-spacing: -0.035em;
  scroll-margin-top: 104px;
}

h1 {
  max-width: 820px;
  margin: 0 0 22px;
  color: #14263e;
  font-size: clamp(45px, 6vw, 72px);
  font-weight: 800;
}

h1 + p {
  max-width: 780px;
  margin-top: 0;
  color: #455362;
  font-size: clamp(20px, 2.2vw, 25px);
  line-height: 1.45;
}

h2 {
  margin: 74px 0 22px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: clamp(31px, 4vw, 44px);
  font-weight: 780;
}

h3 {
  margin: 42px 0 16px;
  font-size: 26px;
  font-weight: 760;
}

p {
  margin: 0 0 24px;
}

strong {
  color: #1c2d41;
}

blockquote {
  margin: 38px 0;
  padding: 28px 30px;
  border-left: 5px solid var(--blue);
  background: var(--mist);
  color: var(--navy);
  font-size: 23px;
  font-weight: 720;
  line-height: 1.45;
}

blockquote p {
  margin: 0;
}

ul,
ol {
  margin: 0 0 28px;
  padding-left: 1.35em;
}

li {
  margin-bottom: 8px;
  padding-left: 5px;
}

figure,
.article > p:has(> img) {
  margin: 44px -42px 15px;
}

.article-figure {
  content-visibility: auto;
  contain-intrinsic-size: auto 520px;
}

.article-figure--hero {
  content-visibility: visible;
  contain-intrinsic-size: none;
}

.article-figure picture {
  display: block;
}

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

.article-figure img,
.article > p > img {
  display: block;
  width: 100%;
  border: 1px solid #e1e6eb;
  border-radius: 5px;
  background: var(--white);
}

.article-figure figcaption {
  margin: 11px 0 38px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.article > p:has(> img) + p > em:only-child {
  display: block;
  margin: 0 0 38px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

table {
  width: 100%;
  margin: 34px 0 42px;
  border-collapse: collapse;
  border-spacing: 0;
  font-size: 15px;
  line-height: 1.52;
}

thead th {
  padding: 15px 17px;
  border: 1px solid #bdc9d4;
  background: var(--navy);
  color: var(--white);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-align: left;
  text-transform: uppercase;
}

tbody td {
  padding: 15px 17px;
  border: 1px solid var(--rule);
  vertical-align: top;
}

tbody tr:nth-child(even) {
  background: #f8fafb;
}

code {
  padding: 0.13em 0.32em;
  border: 1px solid #dce3ea;
  border-radius: 3px;
  background: #f5f7f9;
  color: #254e73;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.86em;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 620px);
  gap: 50px;
  padding: 48px max(28px, calc((100vw - var(--max)) / 2));
  border-top: 1px solid var(--rule);
  background: #f4f7f9;
}

.site-footer > div {
  display: flex;
  align-items: flex-start;
  gap: 15px;
}

.site-footer p {
  margin: 0;
  color: #43505d;
  font-size: 13px;
  line-height: 1.55;
}

.site-footer strong {
  color: var(--navy);
  font-size: 15px;
}

.fine-print {
  align-self: center;
}

@media (max-width: 1040px) {
  .article-shell {
    grid-template-columns: minmax(0, 850px);
    justify-content: center;
  }

  .toc-panel {
    position: relative;
    top: auto;
    max-height: none;
  }

  .toc-panel > ul > li > ul {
    columns: 2;
    column-gap: 36px;
  }

  figure,
  .article > p:has(> img) {
    margin-right: 0;
    margin-left: 0;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 17px;
  }

  .site-header {
    min-height: 64px;
    padding: 0 18px;
  }

  .site-header nav a:not(:last-child) {
    display: none;
  }

  main {
    padding: 34px 18px 64px;
  }

  .article-shell {
    gap: 36px;
  }

  .toc-panel > ul > li > ul {
    columns: 1;
  }

  h1 {
    font-size: 43px;
  }

  h1 + p {
    font-size: 19px;
  }

  h2 {
    margin-top: 58px;
    font-size: 33px;
  }

  blockquote {
    padding: 22px;
    font-size: 20px;
  }

  table {
    display: block;
    overflow-x: auto;
  }

  .site-footer {
    grid-template-columns: 1fr;
    padding: 38px 18px;
  }
}

@media print {
  .site-header,
  .toc-panel {
    display: none;
  }

  main {
    padding: 0;
  }

  .article-shell {
    display: block;
    width: auto;
  }

  .article > p:has(> img) {
    margin-right: 0;
    margin-left: 0;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}

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