:root {
  color-scheme: light;
  --ink: #3c4043;
  --blue: #1a73e8;
  --paper: #fff;
  --mist: #f8f9fa;
  --line: #dadce0;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --space: clamp(4rem, 8vw, 8rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1.5rem; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--mist);
  font: 400 1rem/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main, body > header, body > footer { max-width: 1280px; margin-inline: auto; padding-inline: 1.5rem; }
main { padding-bottom: var(--space); }
section, aside, div, nav, li { min-width: 0; }
p { max-width: 72ch; margin: 0 0 1.25rem; }
h1, h2, h3 { margin: 0 0 1rem; font-weight: 700; line-height: 1.2; text-wrap: balance; }
h1 { font-size: 2.25rem; letter-spacing: -.035em; max-width: 24ch; }
h2 { font-size: 1.5rem; letter-spacing: -.018em; }
h3 { font-size: 1.125rem; letter-spacing: -.01em; }
a {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  min-width: 44px;
  min-height: 44px;
  max-width: 100%;
  color: var(--blue);
  background-color: var(--paper);
  text-decoration-thickness: 1px;
  text-underline-offset: .25em;
  overflow-wrap: anywhere;
  transition: color .3s ease-in-out, box-shadow .3s ease-in-out, border-color .3s ease-in-out;
}
a:hover { color: #1558b0; }
a > span[aria-hidden="true"] { flex-shrink: 0; }
ul, ol { padding-left: 1.5rem; margin: 0 0 1.5rem; }
li { margin-bottom: 1rem; }
li p { margin-bottom: 0; }
figure { margin: 0; }
figcaption { font-size: 1rem; line-height: 1.6; }
button, textarea { font: inherit; }
button {
  min-width: 44px;
  min-height: 48px;
  padding: .75rem 1.25rem;
  color: white;
  background: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 8px;
  font-weight: 500;
  cursor: pointer;
  transition: background .3s ease-in-out, box-shadow .3s ease-in-out;
}
button:hover { background: #1558b0; }
button:disabled { color: var(--ink); background: #f1f3f4; border-color: var(--line); cursor: default; }
textarea {
  display: block;
  width: 100%;
  max-width: 100%;
  min-height: 176px;
  resize: vertical;
  margin: .75rem 0 1rem;
  padding: 1rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid #9aa0a6;
  border-radius: 8px;
  line-height: 1.6;
}
textarea::placeholder { color: #5f6368; opacity: 1; }
label { display: block; font-weight: 500; }
summary { min-height: 48px; padding: .75rem 0; cursor: pointer; font-weight: 500; }
details { border-top: 1px solid var(--line); margin-top: 2rem; padding-top: .5rem; }
details[open] summary { margin-bottom: 1rem; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
::selection { background: #d2e3fc; color: var(--ink); }
[hidden] { display: none !important; }

[data-role="label"], [data-role="eyebrow"] {
  display: block;
  font: 500 1rem/1.5 var(--mono);
  letter-spacing: .02em;
}
[data-role="eyebrow"] { color: #5f6368; margin-bottom: 1.5rem; }
[data-role="skip"] { position: absolute; top: .75rem; left: 1.5rem; z-index: 20; padding: .75rem 1rem; transform: translateY(-160%); }
[data-role="skip"]:focus { transform: translateY(0); }
[data-role="header"] {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 2rem;
  align-items: center;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
[data-role="header"] nav { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
[data-role="header"] nav:last-child { justify-content: flex-end; }
[data-role="header"] nav a { padding-block: .5rem; text-decoration: none; }
[data-role="header"] a[aria-current="page"] { text-decoration: underline; }
[data-role="identity"] { gap: 1rem; min-height: 56px; color: var(--ink); text-decoration: none; font-weight: 500; line-height: 1.35; }
[data-role="identity"] > span:first-child { font: 500 1rem/1.5 var(--mono); color: var(--blue); }
[data-role="identity"]:hover { color: var(--ink); }
[data-role="hero"] {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(3rem, 6vw, 6rem);
  align-items: center;
  padding-block: var(--space);
}
[data-role="hero"] h1 { font-size: clamp(2.5rem, 5vw, 4rem); line-height: 1.06; margin-bottom: 2rem; max-width: 16ch; }
[data-role="deck"] { font-size: 1.25rem; line-height: 1.5; max-width: 45ch; }
[data-role="hero-links"] { display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; margin-top: 2rem; }
[data-role="primary-link"] { min-height: 48px; padding: .75rem 1.25rem; border-radius: 8px; background: var(--blue); color: white; text-decoration: none; font-weight: 500; box-shadow: 0 2px 8px #3c404314; }
[data-role="primary-link"]:hover { background: #1558b0; color: white; }
[data-role="quiet-link"] { padding-block: .75rem; }
[data-role="hero-paper"] {
  position: relative;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(1.5rem, 3vw, 3rem);
  border: 1px solid var(--line);
  border-top: 4px solid var(--blue);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 2px 8px #3c404314, 0 0 40px #1a73e808;
  animation: paper-enter 420ms ease-in-out;
}
[data-role="hero-paper"] > [data-role="label"] { margin-bottom: 2rem; }
[data-role="paper-question"] { display: grid; grid-template-columns: 6rem 1fr; gap: 1rem; align-items: baseline; border-top: 1px solid var(--line); padding-block: 1.5rem; }
[data-role="paper-question"] [data-role="label"] { color: #5f6368; }
[data-role="paper-question"] p { margin: 0; font-size: 1.25rem; letter-spacing: -.01em; }
[data-role="paper-tail"] { margin: 1.5rem 0 0; padding-top: 1rem; border-top: 3px solid #00bcd4; }
[data-role="paper-tail"] span { color: var(--blue); margin-right: .5rem; }
[data-role="page-intro"] { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 6rem; align-items: end; padding-block: var(--space) 3rem; }
[data-role="page-intro"] h1 { max-width: 24ch; }
[data-role="page-intro"] [data-role="deck"] { margin-bottom: 0; }
[data-role="margin-prompt"] { padding: 1.5rem; border-left: 3px solid #00bcd4; background: var(--paper); }
[data-role="margin-prompt"] p { margin-top: 1rem; }
[data-role="margin-prompt"] a { text-decoration: none; }
body[data-page="careful-with"] [data-role="margin-prompt"] { border-color: #fbbc05; }
[data-role="kit-trail"] { display: flex; flex-wrap: wrap; gap: .5rem; padding-bottom: 3rem; border-bottom: 1px solid var(--line); }
[data-role="kit-trail"] a { padding: .5rem 1rem; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; }
[data-role="kit-trail"] a[aria-current="page"] { border-color: var(--blue); box-shadow: inset 0 -2px var(--blue); }
[data-role="page-body"] { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space); margin-top: 4rem; max-width: 72ch; }
body[data-page="home"] [data-role="page-body"] { margin-top: 0; max-width: none; }
body[data-page="home"] [data-role="page-body"] > section:first-child { max-width: 72ch; }
[data-role="next-link"] { gap: 2rem; padding-block: .5rem; font-weight: 500; }
[data-role="routes"] > h2 { margin-bottom: 2rem; }
[data-role="route-pair"] { display: grid; grid-template-columns: 1.3fr 1fr; gap: 1.5rem; margin-bottom: var(--space); }
[data-role="route-card"] { display: block; position: relative; padding: 2rem; color: var(--ink); border: 1px solid var(--line); border-radius: 8px; text-decoration: none; box-shadow: 0 2px 8px #3c404314; }
[data-role="route-card"] h3 { font-size: 1.5rem; margin-top: 1.25rem; }
[data-role="route-card"] p { margin-bottom: 0; }
[data-role="route-card"] > span:last-child { position: absolute; top: 2rem; right: 2rem; color: var(--blue); }
[data-role="route-card"]:hover { color: var(--ink); border-color: var(--blue); box-shadow: 0 2px 8px #1a73e820; }
[data-role="feature-row"] { display: grid; grid-template-columns: 1.1fr 1fr; gap: 6rem; align-items: center; margin-top: var(--space); }
[data-role="feature-row"][data-direction="reverse"] > section { order: 2; }
[data-role="feature-row"][data-direction="reverse"] > figure { order: 1; }
[data-role="flow"] { padding: 2rem; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); box-shadow: 0 2px 8px #3c404314; }
[data-role="flow"] ol { list-style: none; padding: 0; margin: 0 0 1.5rem; }
[data-role="flow"] li { position: relative; padding: 0 0 1.5rem 1.5rem; margin: 0; border-left: 1px solid #00bcd4; }
[data-role="flow"] li::before { content: ""; position: absolute; width: 9px; height: 9px; background: #00bcd4; border: 2px solid var(--paper); top: .45rem; left: -5px; border-radius: 50%; }
[data-role="flow"] li:last-child { padding-bottom: 0; }
[data-role="flow"] li span { display: block; font: 400 1rem/1.5 var(--mono); margin-bottom: .5rem; }
[data-role="flow"] li strong { font-weight: 500; }
[data-role="flow"] figcaption { border-top: 1px solid var(--line); padding-top: 1rem; }
[data-role="question"] { padding: 1.5rem 0 1.5rem 1.5rem; border-left: 2px solid #d2e3fc; margin-top: 1.5rem; background: var(--paper); }
[data-role="question"] h3 { max-width: 54ch; }
[data-role="question"] p { margin: 0; }
[data-role="reading-list"] { list-style: none; padding: 0; margin: 1.5rem 0 0; }
[data-role="reading-list"] li { border-top: 1px solid var(--line); padding: 1rem 0; margin-bottom: 0; }
[data-role="reading-list"] a { font-weight: 500; padding-block: .5rem; }
[data-role="reading-list"] p { margin: .5rem 0 0; }
[data-role="steps"] { list-style: none; padding: 0; border-top: 1px solid var(--line); }
[data-role="steps"] li { padding: 1.5rem 0; margin: 0; border-bottom: 1px solid var(--line); }
[data-role="steps"] h3::before { content: "→"; color: var(--blue); margin-right: .75rem; }
[data-role="notes"] { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 4rem; padding: 3rem; margin-top: var(--space); border: 1px solid var(--line); border-top: 3px solid var(--blue); border-radius: 8px; background: var(--paper); box-shadow: 0 2px 8px #3c404314; }
[data-role="notes"] [data-role="label"] { margin-bottom: 1rem; }
[data-role="note-controls"] { display: flex; flex-wrap: wrap; gap: .75rem; }
[data-clear-note] { color: var(--blue); background: var(--paper); border-color: var(--line); }
[data-clear-note]:hover { color: #1558b0; background: var(--mist); }
[data-note-status] { margin: 1rem 0 0; padding-left: 1rem; border-left: 3px solid var(--line); }
[data-note-status][data-state="saved"] { border-color: #34a853; }
[data-note-status][data-state="unsaved"] { border-color: #fbbc05; }
[data-note-status][data-state="error"] { border-color: #ea4335; }
[data-note-collection] article { padding: 1.5rem 0; border-bottom: 1px solid var(--line); }
[data-note-collection] p { white-space: pre-wrap; overflow-wrap: anywhere; }
[data-role="next"] { max-width: 72ch; border-top: 1px solid var(--line); padding-top: 2rem; margin-top: 4rem; }
[data-role="next"] [data-role="label"] { margin-bottom: .5rem; }
[data-role="footer"] { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 4rem; padding-block: 2rem; border-top: 1px solid var(--line); background: var(--paper); }
[data-role="footer"] p { margin: 0; max-width: 58ch; }
[data-role="footer"] nav { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: start; justify-content: flex-end; }
[data-role="footer"] a { padding-block: .5rem; }

@keyframes paper-enter { from { transform: translateY(8px); } to { transform: translateY(0); } }
@media (max-width: 1000px) {
  [data-role="header"] { gap: 1rem; }
  [data-role="header"] nav { gap: .5rem 1rem; }
  [data-role="hero"], [data-role="feature-row"], [data-role="page-intro"] { gap: 3rem; }
  [data-role="notes"] { gap: 2rem; padding: 2rem; }
}
@media (max-width: 760px) {
  [data-role="header"] { grid-template-columns: 1fr 1fr; row-gap: 1rem; }
  [data-role="identity"] { grid-column: 1 / -1; grid-row: 1; justify-self: center; }
  [data-role="header"] nav { flex-direction: column; align-items: flex-start; gap: 0; }
  [data-role="header"] nav:last-child { align-items: flex-end; }
  [data-role="hero"], [data-role="feature-row"], [data-role="page-intro"], [data-role="notes"], [data-role="footer"] { grid-template-columns: minmax(0, 1fr); }
  [data-role="hero"] { padding-top: 3rem; }
  [data-role="hero-paper"] { min-height: 380px; }
  [data-role="page-intro"] { padding-top: 3rem; }
  [data-role="page-intro"] h1 { font-size: 2.25rem; }
  [data-role="margin-prompt"] { padding: 1rem 1.25rem; }
  [data-role="margin-prompt"] p { margin-block: .75rem; }
  [data-role="kit-trail"] { padding-bottom: 2rem; }
  [data-role="kit-trail"] a { padding-inline: .75rem; }
  [data-role="route-pair"] { grid-template-columns: minmax(0, 1fr); }
  [data-role="feature-row"][data-direction="reverse"] > section, [data-role="feature-row"][data-direction="reverse"] > figure { order: initial; }
  [data-role="notes"] { padding: 1.5rem; gap: 1.5rem; }
  [data-role="notes"] h2 { max-width: 22ch; }
  [data-role="flow"] { padding: 1.5rem; }
  [data-role="footer"] { gap: 1rem; }
  [data-role="footer"] nav { justify-content: flex-start; flex-direction: column; gap: 0; }
  [data-role="paper-question"] { grid-template-columns: minmax(0, 1fr); gap: .5rem; padding-block: 1.25rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media print {
  body { background: white; }
  [data-role="header"], [data-role="kit-trail"], [data-role="margin-prompt"], [data-role="next"], [data-role="note-controls"], [data-role="skip"] { display: none; }
  main { max-width: 72ch; padding-bottom: 0; }
  [data-role="page-intro"], [data-role="notes"] { display: block; padding-block: 1rem; }
  [data-role="page-body"] { gap: 2rem; margin-top: 2rem; }
  a { color: var(--ink); }
  [data-role="notes"] { box-shadow: none; padding: 1rem; }
  textarea { min-height: 8rem; }
  [data-role="footer"] { display: block; margin-top: 2rem; }
  [data-role="footer"] nav { display: none; }
  h2, h3 { break-after: avoid; }
  [data-role="question"], [data-role="reading-list"] li { break-inside: avoid; }
}