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

:root {
  --color-text: #37352f;
  --color-muted: #787774;
  --color-border: #e9e9e7;
  --color-panel: #f7f6f3;
  --page-width: 900px;
  --page-padding: 96px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #fff;
  color: var(--color-text);
  font-family: "Rubik", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: calc(var(--page-width) + (var(--page-padding) * 2));
  margin: 0 auto;
  padding: 60px var(--page-padding) 120px;
}

h1,
h2,
h3 {
  color: var(--color-text);
  line-height: 1.25;
}

h1 {
  margin: 42px 0 12px;
  font-size: 1.875rem;
}

.page > h1:first-child {
  margin-top: 0;
  font-size: 2.5rem;
}

.page > h1:not(:first-child) {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

h2 {
  margin: 36px 0 8px;
  font-size: 1.5rem;
}

h3 {
  margin: 26px 0 8px;
  font-size: 1.2rem;
}

p {
  margin: 8px 0;
}

em {
  color: var(--color-muted);
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: #000;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

ul {
  margin: 6px 0 12px;
  padding-left: 26px;
}

li {
  margin: 5px 0;
  padding-left: 2px;
}

ul ul {
  margin: 4px 0;
}

.toc {
  columns: 2;
  column-gap: 32px;
  margin: 8px 0 24px;
  padding-left: 0;
  list-style: none;
}

.toc li {
  break-inside: avoid;
  margin: 3px 0;
  padding-left: 0;
}

.toc a {
  font-size: 0.9375rem;
}

details.toggle {
  margin: 8px 0 6px;
}

details.toggle > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--color-muted);
  cursor: pointer;
  font-size: 0.9375rem;
  list-style: none;
  user-select: none;
}

details.toggle > summary::-webkit-details-marker {
  display: none;
}

details.toggle > summary::before {
  content: "▶";
  display: inline-block;
  flex-shrink: 0;
  font-size: 0.6rem;
  transition: transform 150ms ease;
}

details.toggle[open] > summary::before {
  transform: rotate(90deg);
}

details.toggle > summary:hover {
  background: var(--color-panel);
}

details.toggle > summary strong {
  font-weight: 500;
}

.toggle-body {
  margin: 6px 0 4px 20px;
  padding: 8px 12px;
  border-radius: 4px;
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 0.9375rem;
}

.toggle-body > :first-child {
  margin-top: 0;
}

.toggle-body > :last-child {
  margin-bottom: 0;
}

@media (max-width: 768px) {
  :root {
    --page-padding: 24px;
  }

  .page {
    padding-top: 36px;
    padding-bottom: 80px;
  }

  .page > h1:first-child {
    font-size: 1.875rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .toc {
    columns: 1;
  }
}