/* Blog reading aids. Scoped to the article layout; the site shell stays unchanged. */
.article-reading-section {
  --article-reading-offset: 112px;
}

.article-reading-section .article-reading-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 740px);
  justify-content: center;
  align-items: start;
  gap: 64px;
  width: min(1180px, calc(100% - 88px));
  margin-inline: auto;
}

.article-reading-section .article-body {
  width: 100%;
  min-width: 0;
  margin: 0;
}

.article-reading-section .article-toc {
  position: sticky;
  top: var(--article-reading-offset);
  min-width: 0;
  color: #39463e;
  font: 500 14px/1.5 Inter, Arial, sans-serif;
}

.article-reading-section .article-toc-disclosure {
  border-top: 1px solid #dce1dd;
}

.article-reading-section .article-toc-disclosure > summary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 52px;
  padding: 13px 6px;
  color: #09090b;
  font-size: 15px;
  font-weight: 750;
  line-height: 1.5;
  list-style: none;
  cursor: pointer;
}

.article-reading-section .article-toc-disclosure > summary::-webkit-details-marker {
  display: none;
}

.article-reading-section .article-toc-disclosure > summary::after {
  content: "";
  flex: 0 0 7px;
  width: 7px;
  height: 7px;
  margin-right: 4px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
}

.article-reading-section .article-toc-disclosure[open] > summary::after {
  transform: translateY(2px) rotate(225deg);
}

.article-reading-section .article-toc-disclosure > summary:hover {
  color: #00692b;
}

.article-reading-section .article-toc nav {
  max-height: max(120px, calc(100vh - var(--article-reading-offset) - 88px));
  max-height: max(120px, calc(100dvh - var(--article-reading-offset) - 88px));
  padding: 5px 6px 7px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: #a3ada6 #f4f4f5;
}

.article-reading-section .article-toc nav::-webkit-scrollbar {
  width: 6px;
}

.article-reading-section .article-toc nav::-webkit-scrollbar-track {
  background: #f4f4f5;
}

.article-reading-section .article-toc nav::-webkit-scrollbar-thumb {
  background: #a3ada6;
  border-radius: 3px;
}

.article-reading-section .article-toc-list {
  --article-toc-axis: 8px;
  --article-toc-marker-top: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-reading-section .article-toc-list > li {
  position: relative;
  margin: 0;
  padding: 0;
}

/* Each segment joins two marker centres, including when a label wraps. */
.article-reading-section .article-toc-list > li:not(:last-child)::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: var(--article-toc-marker-top);
  left: calc(var(--article-toc-axis) - .5px);
  height: 100%;
  border-left: 1px dotted #a3ada6;
  pointer-events: none;
}

.article-reading-section .article-toc-list a {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 44px;
  margin: 0;
  padding: 10px 10px 10px 27px;
  border: 0;
  color: #39463e;
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  text-underline-offset: 4px;
  overflow-wrap: break-word;
}

.article-reading-section .article-toc-list a::before {
  content: "";
  position: absolute;
  z-index: 1;
  top: var(--article-toc-marker-top);
  left: var(--article-toc-axis);
  box-sizing: border-box;
  width: 9px;
  height: 9px;
  border: 1.5px solid #8c9b91;
  border-radius: 50%;
  background: #fff;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.article-reading-section .article-toc-list > li[data-level="3"] a {
  padding-left: 38px;
  font-size: 13px;
}

.article-reading-section .article-toc-list > li[data-level="3"] a::before {
  width: 7px;
  height: 7px;
}

.article-reading-section .article-toc-list a:hover {
  color: #00692b;
  text-decoration: underline;
}

.article-reading-section .article-toc-list a:hover::before {
  border-color: #00692b;
}

.article-reading-section .article-toc-list a[aria-current="location"] {
  color: #00692b;
  font-weight: 750;
}

.article-reading-section .article-toc-list a[aria-current="location"]::before {
  border-color: #00b050;
  background: #00b050;
}

.article-reading-section :is(.article-toc-list a, .article-toc-disclosure > summary):focus-visible {
  outline: 2px solid #00692b;
  outline-offset: 3px;
}

.article-reading-section .article-body :is(h2[id], h3[id], h4[id], .article-tldr[id]) {
  /* The incumbent html already reserves 100px through scroll-padding-top. */
  scroll-margin-top: var(--article-reading-scroll-margin, max(0px, calc(var(--article-reading-offset) - 100px)));
}

.article-reading-section .article-body :is(h2, h3, h4)[tabindex="-1"]:focus-visible {
  outline: 2px solid #00692b;
  outline-offset: 7px;
}

.article-reading-section .article-tldr {
  margin: 0 0 42px;
  padding: 27px 30px 28px;
  border-block: 1px solid #dce1dd;
  background: #f4f4f5;
  color: #303b34;
  font-size: 17px;
  line-height: 1.75;
}

.article-reading-section .article-tldr > h2 {
  margin: 0 0 15px;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.02em;
}

.article-reading-section .article-tldr > ul {
  margin: 0;
  padding-left: 22px;
}

.article-reading-section .article-tldr li {
  margin: 0 0 11px;
  padding-left: 2px;
}

.article-reading-section .article-tldr li:last-child {
  margin-bottom: 0;
}

.article-reading-section ::selection {
  background: #c9edd9;
  color: #09090b;
}

@media (min-width: 1100px) and (max-width: 1199px) {
  .article-reading-section .article-reading-layout {
    grid-template-columns: 210px minmax(0, 740px);
    gap: 40px;
  }
}

@media (max-width: 1099px) {
  .article-reading-section .article-reading-layout {
    grid-template-columns: minmax(0, 740px);
    gap: 30px;
    width: min(740px, calc(100% - 64px));
  }

  .article-reading-section .article-toc {
    position: static;
  }

  .article-reading-section .article-toc-disclosure {
    border-bottom: 1px solid #dce1dd;
  }

  .article-reading-section .article-toc-disclosure > summary {
    padding-inline: 0 6px;
    min-height: 56px;
  }

  .article-reading-section .article-toc nav {
    max-height: 360px;
    max-height: min(360px, 55dvh);
    padding-bottom: 15px;
  }
}

@media (max-width: 800px) {
  .article-reading-section {
    --article-reading-offset: 102px;
  }

  .article-reading-section .article-reading-layout {
    width: calc(100% - 48px);
  }
}

@media (max-width: 550px) {
  .article-reading-section .article-reading-layout {
    width: calc(100% - 40px);
    gap: 25px;
  }

  .article-reading-section .article-tldr {
    margin-bottom: 34px;
    padding: 22px 20px 24px;
    font-size: 16px;
  }

  .article-reading-section .article-tldr > h2 {
    font-size: 21px;
  }
}

@media (max-width: 360px) {
  .article-reading-section .article-reading-layout {
    width: calc(100% - 32px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-reading-section,
  .article-reading-section * {
    scroll-behavior: auto !important;
  }
}