:root {
  color-scheme: light;
  --gb-ink: #23263a;
  --gb-muted: #52566b;
  --gb-accent: #6366f1;
  --gb-link: #3e42b3;
  --gb-green: #10b981;
  --gb-green-ink: #08684b;
  --gb-surface: #f5f5f5;
  --gb-user: #e0e7ff;
  --gb-response: #f9fafb;
  --gb-line: #d9dce7;
  --gb-serif: Georgia, 'Times New Roman', Times, serif;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 110px; }
body {
  margin: 0;
  background: var(--gb-surface);
  color: var(--gb-ink);
  font: 400 16px/1.6 var(--gb-serif);
  -webkit-font-smoothing: antialiased;
}
button, input, summary { font: inherit; }
a { color: var(--gb-link); text-underline-offset: 4px; }
a, summary { -webkit-tap-highlight-color: #e0e7ff; }
a:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--gb-link);
  outline-offset: 5px;
  border-radius: 5px;
}
p { margin: 0 0 1.1rem; max-width: 72ch; }
p:last-child { margin-bottom: 0; }
h1, h2, h3 { font-weight: 700; text-wrap: balance; }
h1 { margin: 0 0 1.25rem; font-size: 2.25rem; line-height: 1.16; letter-spacing: -.035em; }
h2 { margin: 0; font-size: clamp(1.45rem, 2.3vw, 1.8rem); line-height: 1.25; letter-spacing: -.025em; }
h3 { margin: 0 0 .75rem; font-size: 1.125rem; line-height: 1.35; }
ul, ol { padding-left: 1.25rem; }
li { font-size: 1rem; }
summary { min-height: 48px; cursor: pointer; }
summary::marker { color: var(--gb-link); }
[hidden] { display: none !important; }

.gb-skip {
  position: fixed;
  z-index: 20;
  top: -100px;
  left: 1rem;
  padding: 12px 20px;
  background: white;
  border: 2px solid var(--gb-link);
  border-radius: 8px;
}
.gb-skip:focus { top: 12px; }
.gb-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 15;
  width: 100%;
  height: 4px;
  border: 0;
  border-radius: 0;
  background: transparent;
  appearance: none;
}
.gb-progress::-webkit-progress-bar { background: transparent; }
.gb-progress::-webkit-progress-value { background: var(--gb-green); }
.gb-progress::-moz-progress-bar { background: var(--gb-green); }
.gb-site-head {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--gb-line);
  background: #f5f5f5f5;
}
.gb-site-head__inner {
  max-width: 1184px;
  min-height: 88px;
  margin: auto;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.gb-brand {
  display: flex;
  align-items: center;
  gap: 13px;
  min-height: 48px;
  padding: 8px 0;
  color: var(--gb-ink);
  text-decoration: none;
  font-size: 1.125rem;
  font-weight: 700;
  white-space: nowrap;
}
.gb-brand__sub { color: var(--gb-muted); font-size: 1rem; font-weight: 400; }
.gb-brand__mark {
  display: block;
  width: 22px;
  height: 28px;
  border: 2px solid var(--gb-accent);
  border-radius: 3px 8px 8px 3px;
  box-shadow: -5px 4px 0 -2px var(--gb-user);
  position: relative;
}
.gb-brand__mark::after {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  right: 3px;
  bottom: 4px;
  background: var(--gb-green);
  border-radius: 50%;
}
.gb-book { position: relative; }
.gb-book > summary {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border: 1px solid #c3c7d8;
  border-radius: 12px;
  background: white;
  color: var(--gb-ink);
  list-style: none;
}
.gb-book > summary::-webkit-details-marker { display: none; }
.gb-book[open] > summary { background: var(--gb-user); border-color: #a6adeb; }
.gb-book nav {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 280px;
  max-width: calc(100vw - 32px);
  max-height: calc(100dvh - 115px);
  overflow-y: auto;
  background: white;
  border: 1px solid var(--gb-line);
  border-radius: 16px;
  padding: 8px;
  box-shadow: 0 16px 40px #23263a14;
}
.gb-book ul { list-style: none; margin: 0; padding: 0; }
.gb-book a { display: flex; min-height: 46px; align-items: center; padding: 10px 14px; border-radius: 8px; color: var(--gb-ink); text-decoration: none; }
.gb-book a[aria-current='page'] { background: var(--gb-user); color: var(--gb-link); }
.gb-book a:hover { background: var(--gb-response); }

.gb-main { max-width: 1184px; margin: auto; padding: 0 28px; }
.gb-main:focus { outline: none; }
.gb-label { color: var(--gb-muted); font-size: .875rem; font-weight: 500; letter-spacing: .035em; }
.gb-lead { color: var(--gb-muted); font-size: 1.125rem; line-height: 1.6; }
.gb-hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 72px;
  padding: 64px 0 56px;
}
.gb-hero h1 { font-size: clamp(2.5rem, 4.1vw, 3.65rem); line-height: 1.09; letter-spacing: -.045em; }
.gb-hero .gb-label { margin-bottom: 1.25rem; color: var(--gb-link); font-size: 1rem; }
.gb-context {
  border-left: 3px solid var(--gb-accent);
  padding: 2px 0 2px 18px;
  margin: 28px 0;
}
.gb-context p { font-size: 1rem; }
.gb-button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 13px 20px;
  background: var(--gb-link);
  color: white;
  text-decoration: none;
  border-radius: 12px;
  border: 1px solid var(--gb-link);
}
.gb-button:hover { background: #30338d; }
.gb-hero__visual {
  min-width: 0;
  padding: 24px;
  background: #ededf2;
  border: 1px solid #e4e4ed;
  border-radius: 26px;
}
.gb-bubble {
  margin: 0 0 24px auto;
  width: fit-content;
  max-width: 100%;
  padding: 16px 22px;
  background: var(--gb-user);
  border: 1px solid #bfc8ef;
  border-radius: 20px 20px 5px 20px;
  color: #31385d;
  font-size: 1.125rem;
}
.gb-quote-map { margin: 0; background: var(--gb-response); border: 1px solid var(--gb-line); border-radius: 5px 20px 20px 20px; overflow: hidden; }
.gb-quote-map__top { display: flex; gap: 10px; align-items: center; padding: 19px 22px; border-bottom: 1px solid var(--gb-line); color: var(--gb-green-ink); }
.gb-status-dot { width: 7px; height: 7px; flex-shrink: 0; border-radius: 50%; background: var(--gb-green); box-shadow: 0 0 0 4px #10b98114; }
.gb-quote-map__rows { margin: 0; padding: 6px 22px; }
.gb-quote-map__rows > div { display: grid; grid-template-columns: .8fr 1.2fr; gap: 16px; padding: 17px 0; border-bottom: 1px dashed #cdd1df; }
.gb-quote-map__rows > div:last-child { border-bottom: 0; }
.gb-quote-map dt { font-weight: 700; }
.gb-quote-map dd { margin: 0; color: var(--gb-muted); }
.gb-quote-map figcaption { border-top: 1px solid var(--gb-line); padding: 18px 22px; background: white; }
.gb-visual-note { margin: 20px 8px 0; font-size: 1rem; color: var(--gb-muted); }
.gb-page-intro { max-width: 780px; padding: 64px 0 36px; }
.gb-page-intro h1 { max-width: 24ch; }
.gb-page-intro .gb-label { margin-bottom: 1rem; color: var(--gb-link); }
.gb-rail {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  border-top: 1px solid var(--gb-line);
  border-bottom: 1px solid var(--gb-line);
  padding: 10px 0;
}
.gb-rail__label { margin-right: 18px; color: var(--gb-muted); font-size: .875rem; }
.gb-rail a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 14px; border: 1px solid transparent; border-radius: 24px; text-decoration: none; }
.gb-rail a:hover { background: var(--gb-user); border-color: #c3caf0; }
.gb-reading-body { max-width: 960px; margin: 44px auto 0; }
.gb-answer { display: grid; grid-template-columns: minmax(170px, .75fr) minmax(0, 2fr); align-items: start; gap: 30px; margin: 0 0 48px; scroll-margin-top: 24px; }
.gb-answer__question { padding: 22px; background: var(--gb-user); border: 1px solid #bdc8ee; border-radius: 18px 18px 5px 18px; }
.gb-answer__response { min-width: 0; padding: 26px 28px; background: var(--gb-response); border: 1px solid var(--gb-line); border-radius: 5px 20px 20px 20px; }
.gb-answer:nth-of-type(even) .gb-answer__question { margin-top: 20px; }
.gb-answer__response p, .gb-answer__response li { font-size: 1rem; }
.gb-link { display: inline-flex; gap: 16px; align-items: center; min-height: 44px; padding: 9px 0; line-height: 1.55; font-size: 1rem; }
.gb-link span[aria-hidden] { white-space: nowrap; margin-left: auto; }
.gb-mini-links { display: grid; gap: 2px; margin-top: 12px; }
.gb-questions { list-style: none; max-width: 72ch; margin: 18px 0; padding: 0; }
.gb-questions li { padding: 12px 0 12px 22px; border-bottom: 1px solid var(--gb-line); position: relative; }
.gb-questions li::before { content: ''; position: absolute; top: 22px; left: 0; width: 7px; height: 7px; border: 1px solid var(--gb-accent); border-radius: 2px; }
.gb-questions li:last-child { border-bottom: 0; }
.gb-source { border-top: 1px solid var(--gb-line); margin-top: 24px; }
.gb-source summary { display: list-item; padding: 14px 6px 14px 2px; color: var(--gb-link); font-size: 1rem; }
.gb-source__body { padding: 4px 0 10px; }
.gb-source__date { font-family: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace; color: var(--gb-muted); font-size: 1rem; }
.gb-source__links { list-style: none; margin: 8px 0 0; padding: 0; }
.gb-source__links li { border-top: 1px solid #e5e7ee; }
.gb-source__links a { width: 100%; padding: 11px 0; overflow-wrap: anywhere; }
.gb-prompt { background: white; border: 1px solid #cdd2e5; border-left: 3px solid var(--gb-accent); padding: 22px; margin: 22px 0; border-radius: 0 14px 14px 0; }
.gb-prompt h3 { color: var(--gb-link); }
.gb-diagram { max-width: 720px; margin: 0 0 48px auto; padding: 28px; border: 1px solid var(--gb-line); background: white; border-radius: 20px; }
.gb-diagram h3 { font-size: 1.35rem; }
.gb-diagram__steps { list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 22px 0; padding: 0; }
.gb-diagram__steps li { border: 1px solid #c8cfe9; background: #f4f6ff; border-radius: 12px; padding: 18px; }
.gb-diagram__steps strong { display: block; margin-bottom: 8px; color: var(--gb-link); }
.gb-diagram__steps span { display: block; }
.gb-diagram figcaption { font-size: 1rem; color: var(--gb-muted); }
.gb-route { margin: 16px 0 64px; }
.gb-route__intro { padding: 8px 0 24px; }
.gb-route h2 { margin-bottom: 12px; }
.gb-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.gb-card { display: block; min-height: 112px; padding: 22px; border: 1px solid var(--gb-line); border-radius: 16px; background: white; text-decoration: none; font-size: 1rem; }
.gb-card:hover { border-color: #989ae1; background: #f6f7ff; }
.gb-card__title { display: flex; justify-content: space-between; gap: 16px; font-weight: 700; font-size: 1.125rem; line-height: 1.4; }
.gb-card__text { display: block; color: var(--gb-muted); font-size: 1rem; margin-top: 10px; line-height: 1.6; }
.gb-next { max-width: 720px; margin: 8px 0 56px auto; }
.gb-next > .gb-label { display: block; margin: 0 0 12px 4px; }
.gb-next .gb-card { border-color: #bfc8e9; background: #e9edff; }
.gb-next .gb-card:hover { background: #e0e7ff; }
.gb-recovery { max-width: 720px; display: grid; gap: 16px; margin-bottom: 64px; }
.gb-footer { border-top: 1px solid var(--gb-line); background: #eeeeF2; padding: 32px 28px; }
.gb-footer__inner { max-width: 1128px; margin: auto; }
.gb-footer p { font-size: 1rem; color: var(--gb-muted); }
.gb-footer nav { display: flex; flex-wrap: wrap; gap: 12px 32px; margin-top: 16px; }
.gb-footer a { min-height: 48px; }

@media (min-width: 800px) and (prefers-reduced-motion: no-preference) {
  a, summary { transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease; }
}
@media (max-width: 850px) {
  .gb-hero { gap: 32px; grid-template-columns: 1.05fr 1fr; }
  .gb-hero__visual { padding: 16px; }
  .gb-quote-map__rows > div { grid-template-columns: 1fr; gap: 3px; padding: 12px 0; }
  .gb-answer { grid-template-columns: minmax(150px, .75fr) minmax(0, 2fr); gap: 20px; }
  .gb-answer__response { padding: 24px; }
}
@media (max-width: 650px) {
  html { scroll-padding-top: 100px; }
  .gb-site-head__inner { min-height: 80px; padding: 14px 20px; }
  .gb-brand { gap: 10px; }
  .gb-brand__sub { display: block; line-height: 1.2; }
  .gb-brand__mark { width: 20px; }
  .gb-book > summary { padding: 10px 14px; }
  .gb-main { padding: 0 20px; }
  .gb-hero { grid-template-columns: 1fr; padding: 38px 0 32px; gap: 32px; }
  .gb-hero h1 { font-size: clamp(2.5rem, 10.5vw, 3.35rem); line-height: 1.1; }
  .gb-hero .gb-label { margin-bottom: 16px; }
  .gb-hero__visual { padding: 18px; }
  .gb-quote-map__rows > div { grid-template-columns: .85fr 1.15fr; gap: 12px; padding: 15px 0; }
  .gb-quote-map__rows { padding: 4px 18px; }
  .gb-quote-map__top, .gb-quote-map figcaption { padding: 16px 18px; }
  .gb-bubble { padding: 14px 18px; margin-bottom: 18px; }
  .gb-page-intro { padding: 38px 0 28px; }
  h1 { font-size: 2.25rem; }
  .gb-lead { font-size: 1.0625rem; }
  .gb-rail { column-gap: 0; padding: 8px 0; }
  .gb-rail__label { width: 100%; margin: 0 0 4px 10px; }
  .gb-rail a { padding: 9px 12px; }
  .gb-reading-body { margin-top: 30px; }
  .gb-answer { grid-template-columns: 1fr; gap: 12px; margin-bottom: 32px; }
  .gb-answer__question { width: fit-content; max-width: 95%; margin-left: auto; padding: 18px 20px; }
  .gb-answer:nth-of-type(even) .gb-answer__question { margin-top: 0; }
  .gb-answer__response { padding: 22px 20px; }
  .gb-answer__question h2 { font-size: 1.45rem; }
  .gb-diagram { padding: 22px 20px; margin-bottom: 32px; }
  .gb-diagram__steps { grid-template-columns: 1fr; gap: 10px; }
  .gb-diagram__steps li { padding: 16px; position: relative; }
  .gb-diagram__steps li + li::before { content: ''; position: absolute; height: 11px; width: 1px; background: #b5bee2; top: -12px; left: 24px; }
  .gb-prompt { padding: 18px; }
  .gb-card-grid { grid-template-columns: 1fr; gap: 12px; }
  .gb-card { padding: 20px; }
  .gb-route { margin-bottom: 44px; }
  .gb-next { margin-bottom: 40px; }
  .gb-footer { padding: 28px 20px; }
  .gb-footer nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; }
  .gb-footer a { width: 100%; }
}

@media print {
  .gb-site-head, .gb-progress, .gb-rail, .gb-skip, .gb-footer nav, .gb-next { display: none; }
  body, .gb-answer__response, .gb-card { background: white; }
  .gb-main { max-width: none; padding: 0; }
  .gb-page-intro, .gb-hero { padding-top: 0; }
  .gb-answer { break-inside: avoid; }
  a { color: var(--gb-ink); }
}