:root {
  color-scheme: light;
  --ink: #182b3a;
  --muted: #536778;
  --line: #c8d5df;
  --paper: #ffffff;
  --wash: #f3f7fa;
  --accent: #1d70b8;
  --accent-dark: #124d80;
  --focus: #ffbf47;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--wash);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.65;
}
a { color: var(--accent-dark); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 0.15em; }
a:focus-visible, button:focus-visible, [tabindex="-1"]:focus-visible,
[tabindex="0"]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}
.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.5rem;
  left: 0.5rem;
  transform: translateY(-180%);
  border: 2px solid var(--ink);
  background: var(--focus);
  color: #111;
  padding: 0.55rem 0.8rem;
  font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.site-header__inner {
  display: flex;
  max-width: 90rem;
  margin: 0 auto;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}
.site-header__title {
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
}
.site-header__meta { color: var(--muted); font-size: 0.9rem; }
.guide-layout {
  display: grid;
  grid-template-columns: minmax(15rem, 19rem) minmax(0, 1fr);
  max-width: 90rem;
  min-height: calc(100vh - 4rem);
  margin: 0 auto;
}
.guide-sidebar {
  border-right: 1px solid var(--line);
  background: #eaf1f6;
  padding: 1.5rem 1rem 2rem;
}
.guide-sidebar nav { position: static; }
.guide-sidebar__toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.75rem;
}
.guide-sidebar__pin {
  display: inline-flex;
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: 1px solid #879dab;
  border-radius: 0.3rem;
  background: var(--paper);
  color: var(--ink);
  padding: 0.45rem 0.65rem;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
}
.guide-sidebar__pin:hover { background: #f7fafc; }
.guide-sidebar__pin-mark {
  flex: 0 0 auto;
  color: var(--accent-dark);
  font-size: 1rem;
}
.guide-sidebar h2 {
  margin: 0 0 0.65rem;
  font-size: 0.82rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.guide-sidebar ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
.guide-sidebar li + li { margin-top: 0.18rem; }
.guide-sidebar a {
  display: flex;
  min-height: 2.75rem;
  border-left: 4px solid transparent;
  border-radius: 0.2rem;
  padding: 0.45rem 0.55rem;
  align-items: center;
  color: #233b4d;
  font-size: 0.9rem;
  line-height: 1.35;
  text-decoration: none;
}
.guide-sidebar a:hover { background: rgb(255 255 255 / 70%); }
.guide-sidebar a[aria-current="page"] {
  border-left-color: var(--accent);
  background: var(--paper);
  color: #102b40;
  font-weight: 750;
}
.guide-main {
  min-width: 0;
  background: var(--paper);
  padding: clamp(1.5rem, 4vw, 4rem);
}
.guide-content {
  max-width: 76ch;
  margin: 0 auto;
  overflow-wrap: anywhere;
}
.guide-content h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
}
.guide-content h2 {
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid #dce5ec;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  line-height: 1.25;
}
.guide-content h3 {
  margin: 1.8rem 0 0.6rem;
  font-size: 1.15rem;
}
[data-section-heading] {
  scroll-margin-top: 1rem;
}
[data-section-heading]:target,
[data-section-heading].fragment-target {
  border-radius: 0.2rem;
  background: #fff4bf;
  box-shadow: -0.45rem 0 0 #ffbf47;
}
.heading-permalink {
  margin-left: 0.45rem;
  color: var(--muted);
  font-size: 0.75em;
  font-weight: 700;
  text-decoration: none;
}
.heading-permalink:hover,
.heading-permalink:focus-visible {
  color: var(--accent-dark);
  text-decoration: underline;
}
.guide-content p, .guide-content ul, .guide-content ol,
.guide-content blockquote { margin-top: 0.75rem; margin-bottom: 1rem; }
.guide-content li + li { margin-top: 0.28rem; }
.guide-content code {
  border-radius: 0.2rem;
  background: #edf2f5;
  padding: 0.1em 0.3em;
  color: #24333e;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}
.guide-content pre {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid #b9c8d3;
  border-radius: 0.4rem;
  background: #f5f8fa;
  padding: 1rem;
  line-height: 1.45;
}
.guide-content pre code { background: transparent; padding: 0; }
.guide-content blockquote {
  border-left: 4px solid var(--accent);
  margin-left: 0;
  padding: 0.25rem 0 0.25rem 1rem;
  color: #344b5e;
}
.table-scroll { max-width: 100%; overflow-x: auto; margin: 1.25rem 0; }
.guide-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}
.guide-content th, .guide-content td {
  border: 1px solid #bdcbd5;
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}
.guide-content th { background: #eaf1f6; }
.chapter-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  max-width: 76ch;
  margin: 3rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
.chapter-nav a {
  border: 1px solid #aebfcb;
  border-radius: 0.4rem;
  background: var(--wash);
  padding: 0.8rem;
  text-decoration: none;
}
.chapter-nav a:last-child { text-align: right; }
.chapter-nav strong { display: block; color: var(--ink); }
.guide-footer {
  max-width: 76ch;
  margin: 2rem auto 0;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (min-width: 761px) {
  body.beginner-guide {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
  }
  .beginner-guide .guide-layout {
    width: 100%;
    height: 100%;
    min-height: 0;
    overflow: hidden;
  }
  .beginner-guide .guide-sidebar {
    position: relative;
    z-index: 3;
    align-self: stretch;
    width: 100%;
    height: 100%;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior-y: contain;
    scrollbar-gutter: stable;
  }
  .beginner-guide .guide-main {
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior-y: contain;
    scrollbar-gutter: stable;
  }
  html[data-guide-sidebar-collapsed="true"] .beginner-guide .guide-layout {
    grid-template-columns: 3.5rem minmax(0, 1fr);
  }
  html[data-guide-sidebar-collapsed="true"] .beginner-guide .guide-sidebar {
    width: 3.5rem;
    padding: 0.5rem 0.35rem 1rem;
  }
  html[data-guide-sidebar-collapsed="true"] .beginner-guide
    .guide-sidebar:is(:hover, :focus-within) {
    width: min(19rem, calc(100vw - 2rem));
    box-shadow: 0.35rem 0 0.8rem rgb(24 43 58 / 20%);
    padding: 1.5rem 1rem 2rem;
  }
  html[data-guide-sidebar-collapsed="true"] .beginner-guide
    .guide-sidebar:not(:hover):not(:focus-within) .guide-sidebar__toolbar {
    justify-content: center;
    margin-bottom: 0.5rem;
  }
  html[data-guide-sidebar-collapsed="true"] .beginner-guide
    .guide-sidebar:not(:hover):not(:focus-within) .guide-sidebar__pin {
    width: 2.75rem;
    padding: 0.35rem;
  }
  html[data-guide-sidebar-collapsed="true"] .beginner-guide
    .guide-sidebar:not(:hover):not(:focus-within)
    [data-guide-sidebar-pin-label],
  html[data-guide-sidebar-collapsed="true"] .beginner-guide
    .guide-sidebar:not(:hover):not(:focus-within) h2,
  html[data-guide-sidebar-collapsed="true"] .beginner-guide
    .guide-sidebar:not(:hover):not(:focus-within) li:not(.is-current) {
    display: none;
  }
  html[data-guide-sidebar-collapsed="true"] .beginner-guide
    .guide-sidebar:not(:hover):not(:focus-within) .is-current a {
    display: block;
    max-height: calc(100dvh - 5rem);
    overflow: hidden;
    border-top: 4px solid var(--accent);
    border-left: 0;
    padding: 0.65rem 0.45rem;
    text-overflow: ellipsis;
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }
}

@media (min-width: 761px) and (prefers-reduced-motion: no-preference) {
  html[data-guide-sidebar-collapsed="true"] .beginner-guide .guide-sidebar {
    transition: width 160ms ease, box-shadow 160ms ease, padding 160ms ease;
  }
}

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

@media (max-width: 760px) {
  .site-header__inner { align-items: flex-start; flex-direction: column; }
  .guide-layout { grid-template-columns: 1fr; }
  .guide-sidebar {
    position: static;
    height: auto;
    overflow: visible;
    overscroll-behavior-y: auto;
    scrollbar-gutter: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .guide-sidebar__toolbar { display: none; }
  .guide-sidebar ol {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
    gap: 0.2rem 0.6rem;
  }
  .guide-main { padding: 1.5rem 1rem 2.5rem; }
  .chapter-nav { grid-template-columns: 1fr; }
  .chapter-nav a:last-child { text-align: left; }
}

@media print {
  body { background: #fff; }
  body.beginner-guide { display: block; height: auto; overflow: visible; }
  .skip-link, .site-header, .guide-sidebar, .chapter-nav, .guide-footer {
    display: none;
  }
  .heading-permalink { display: none; }
  .guide-layout { display: block; }
  .guide-main { padding: 0; }
  .guide-content { max-width: none; }
}