:root {
  color-scheme: light;
  --paper: #f5f3e9;
  --sheet: #fffdf7;
  --ink: #172d30;
  --quiet: #445654;
  --line: #bdc8be;
  --blue: #1b4070;
  --green: #235343;
  --rust: #934120;
  --blue-wash: #e6edf5;
  --green-wash: #e3ece2;
  --rust-wash: #f2e5d9;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body { margin: 0; color: var(--ink); font: 18px/1.65 var(--sans); }
main, header, footer, nav, section, article, aside, div { min-width: 0; }
body, button, select, input, a { -webkit-tap-highlight-color: #bdc8be; }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 5px; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible, summary:focus-visible, select:focus-visible, input:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}
button, select, input { font: inherit; }
button, select { color: var(--ink); }
button { cursor: pointer; }
button:hover { background: var(--blue-wash); }
button:active { background: var(--green-wash); }
button:disabled { color: var(--quiet); background: var(--green-wash); border-color: var(--quiet); opacity: 1; cursor: default; }
[hidden] { display: none !important; }
h1, h2, h3, p, ul, dl, figure { margin-top: 0; }
p, li { overflow-wrap: break-word; }
p { margin-bottom: 1.15rem; }
ul { padding-left: 1.4rem; }
li + li { margin-top: 0.5rem; }
h1 { font: 400 56px/1.1 var(--serif); letter-spacing: -0.025em; margin-bottom: 1.25rem; max-width: 22ch; text-wrap: balance; }
h2 { font: 600 28px/1.25 var(--sans); letter-spacing: -0.018em; margin-bottom: 1.25rem; max-width: 29ch; text-wrap: balance; }
h3 { font: 400 26px/1.25 var(--serif); margin-bottom: 1rem; text-wrap: balance; }
[data-role="masthead"], [data-role="reading"], [data-role="footer"] { width: min(1180px, calc(100% - 96px)); margin-inline: auto; }
[data-role="masthead"] { min-height: 110px; display: flex; align-items: center; justify-content: space-between; gap: 40px; border-bottom: 1px solid var(--ink); position: relative; z-index: 2; }
[data-role="wordmark"] { min-height: 64px; display: inline-flex; align-items: center; gap: 17px; text-decoration: none; color: var(--ink); font: 400 27px/1.2 var(--serif); }
[data-role="wordmark-sub"] { display: block; font: 16px/1.5 var(--sans); margin-top: 4px; color: var(--quiet); }
[data-role="route-mark"] { flex: 0 0 31px; width: 31px; height: 42px; position: relative; border-left: 2px solid var(--blue); border-bottom: 2px solid var(--blue); border-radius: 0 0 0 12px; }
[data-role="route-mark"]::before, [data-role="route-mark"]::after { content: ""; position: absolute; width: 10px; height: 10px; background: var(--green); border: 2px solid var(--paper); border-radius: 50%; }
[data-role="route-mark"]::before { left: -6px; top: -4px; }
[data-role="route-mark"]::after { right: -3px; bottom: -6px; background: var(--rust); }
[data-role="progressive-menu"] { width: 330px; max-width: 100%; align-self: center; }
summary { cursor: pointer; }
[data-role="menu-root"] > summary { font-size: 17px; padding: 13px 16px; min-height: 52px; border: 1px solid var(--ink); background: var(--sheet); }
[data-role="menu-root"][open] > summary { background: var(--blue-wash); }
[data-role="menu-body"] { position: absolute; right: 0; top: calc(100% - 18px); width: 380px; max-width: 100%; padding: 12px; border: 1px solid var(--ink); background: var(--sheet); box-shadow: 8px 8px 0 #dbe3d7; max-height: 70vh; overflow-y: auto; }
[data-role="menu-group"] + [data-role="menu-group"] { border-top: 1px solid var(--line); }
[data-role="menu-group"] > summary { min-height: 50px; padding: 12px 10px; font-size: 17px; }
[data-role="menu-group"] ul { padding: 0 10px 10px; margin: 0; list-style: none; }
[data-role="menu-group"] li { margin: 0; }
[data-role="menu-group"] a { display: flex; align-items: center; min-height: 48px; padding: 9px 12px; font-size: 17px; }
[data-role="menu-group"] a[aria-current="page"] { color: var(--ink); background: var(--green-wash); border-left: 3px solid var(--green); text-decoration: none; }
[data-role="skip-link"] { position: absolute; left: 24px; top: 12px; z-index: 10; background: var(--sheet); padding: 12px 18px; min-height: 48px; transform: translateY(-150%); }
[data-role="skip-link"]:focus { transform: none; }
[data-role="chapter-opener"] { padding: 64px 0 50px 190px; border-bottom: 1px solid var(--line); }
[data-role="eyebrow"] { font: 16px/1.5 var(--mono); color: var(--green); margin-bottom: 19px; }
[data-role="opener"] { font-size: 21px; line-height: 1.6; max-width: 62ch; margin: 0; }
[data-role="chapter-body"] { display: grid; grid-template-columns: 150px minmax(0, 760px); column-gap: 40px; padding-top: 48px; padding-bottom: 60px; }
[data-role="chapter-prose"] { max-width: 760px; }
[data-role="chapter-marker"] { height: 185px; padding: 20px 0 0 24px; position: relative; }
[data-role="chapter-marker"]::before { content: ""; position: absolute; height: 133px; left: 29px; top: 29px; width: 1px; background: var(--line); }
[data-role="chapter-marker"] span { display: block; position: relative; background: var(--paper); border: 1px solid var(--green); border-radius: 50%; width: 12px; height: 12px; margin-bottom: 52px; }
[data-role="chapter-marker"] span:first-child { background: var(--green); }
[data-role="chapter-marker"] span:last-child { border-color: var(--rust); border-radius: 0; }
[data-role="chapter-section"] { margin-bottom: 46px; padding-bottom: 8px; }
[data-role="chapter-section"] > p, [data-role="chapter-section"] > ul { max-width: 69ch; }
[data-role="text-link"], [data-role="source-link"], [data-role="next-link"] { display: flex; align-items: center; justify-content: space-between; gap: 18px; width: fit-content; max-width: 100%; min-height: 48px; padding: 10px 0; line-height: 1.45; }
[data-role="text-link"] > span, [data-role="source-link"] > span, [data-role="next-link"] > span { flex: 0 0 auto; }
[data-role="source-link"] { padding-inline: 0 10px; width: 100%; border-bottom: 1px solid var(--line); }
[data-role="source-link"] + [data-role="source-link"] { margin-top: 8px; }
[data-role="question-list"] { margin: 20px 0; }
[data-role="route-comparison"] { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 28px; margin-bottom: 12px; }
[data-role="route"] { border-top: 2px solid var(--blue); padding: 24px 0 12px; }
[data-role="route"]:nth-child(2n) { border-top-color: var(--green); }
[data-role="route"]:nth-child(3n) { border-top-color: var(--rust); }
[data-role="route"]:last-child:nth-child(odd) { grid-column: 1 / -1; }
[data-role="route"] p, [data-role="route"] li { font-size: 18px; }
[data-role="route"] [data-role="question-list"] { margin-bottom: 24px; }
[data-role="term-list"] { margin-bottom: 24px; }
[data-role="term"] { display: grid; grid-template-columns: 180px minmax(0, 1fr); padding: 20px 0; gap: 24px; border-top: 1px solid var(--line); }
dt { font: 600 18px/1.5 var(--sans); }
dd { margin: 0; }
dd p { margin: 0; }
[data-role="effect-comparison"] { margin: 26px 0; border-left: 4px solid var(--blue); padding: 24px; background: var(--blue-wash); }
[data-role="effect-comparison"] p:last-child { margin-bottom: 0; }
[data-role="chapter-recap"] { background: var(--green-wash); padding: 28px 32px; border-left: 3px solid var(--green); margin-top: 16px; }
[data-role="chapter-recap"] p { margin: 0; max-width: 62ch; font-size: 19px; }
[data-role="chapter-recap"] [data-role="recap-label"] { font: 16px/1.5 var(--mono); letter-spacing: 0; margin-bottom: 12px; }
[data-role="next-chapter"] { display: flex; align-items: baseline; gap: 28px; padding-top: 32px; }
[data-role="next-chapter"] > span { font: 16px/1.5 var(--mono); color: var(--quiet); flex-shrink: 0; }
[data-role="footer"] { border-top: 1px solid var(--ink); padding: 30px 0 42px; display: grid; grid-template-columns: minmax(0, 650px) 1fr; gap: 60px; font-size: 17px; }
[data-role="footer"] p { margin: 0; max-width: 65ch; }
[data-role="footer-links"] { justify-self: end; }
[data-role="footer-links"] a { font-size: 17px; }

/* The opening spread combines a branch diagram with a reading column. */
[data-page="home"] [data-role="chapter-opener"] { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr); column-gap: 70px; padding: 40px 0 54px; }
[data-role="guide-frame"] { grid-column: 1 / -1; font-size: 18px; line-height: 1.55; padding-bottom: 22px; margin-bottom: 35px; border-bottom: 1px solid var(--line); max-width: none; }
[data-page="home"] [data-role="eyebrow"], [data-page="home"] h1, [data-page="home"] [data-role="opener"] { grid-column: 1; }
[data-page="home"] h1 { font-size: 60px; max-width: 17ch; margin-bottom: 22px; }
[data-role="path-map"] { grid-column: 2; grid-row: 2 / span 3; margin: 0; padding: 26px 24px; align-self: center; border: 1px solid var(--line); background-color: var(--sheet); background-image: linear-gradient(#e3e9e0 1px, transparent 1px), linear-gradient(90deg, #e3e9e0 1px, transparent 1px); background-size: 24px 24px; }
[data-role="path-map"] figcaption { font: 16px/1.5 var(--mono); margin-bottom: 28px; max-width: 24ch; background: var(--sheet); padding: 4px 6px; }
[data-role="map-start"], [data-role="map-end"] { padding: 13px 12px; border: 1px solid var(--blue); background: var(--blue-wash); text-align: center; font-size: 17px; line-height: 1.45; }
[data-role="map-start"] { border-radius: 28px; }
[data-role="map-branches"] { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding-block: 37px; position: relative; }
[data-role="map-branches"]::before, [data-role="map-branches"]::after { content: ""; position: absolute; left: 50%; height: 25px; width: 1px; background: var(--green); }
[data-role="map-branches"]::before { top: 0; }
[data-role="map-branches"]::after { bottom: 0; }
[data-role="map-node"] { background: var(--green-wash); border: 1px solid var(--green); padding: 12px 8px; text-align: center; position: relative; line-height: 1.45; font-size: 17px; }
[data-role="map-node"]::before, [data-role="map-node"]::after { content: ""; position: absolute; width: 50%; height: 13px; border-top: 1px solid var(--green); border-left: 1px solid var(--green); top: -13px; left: 50%; }
[data-role="map-node"]::after { top: auto; bottom: -13px; border-top: 0; border-bottom: 1px solid var(--green); }
[data-role="map-node"]:last-child::before, [data-role="map-node"]:last-child::after { left: 0; border-left: 0; border-right: 1px solid var(--green); }
[data-role="map-end"] { background: var(--rust-wash); border-color: var(--rust); }
[data-page="home"] [data-role="chapter-body"] { grid-template-columns: 150px minmax(0, 1fr); }
[data-page="home"] [data-role="chapter-prose"] { max-width: none; }
[data-role="home-answer"] { max-width: 720px; margin-bottom: 46px; }
[data-role="home-choices"] { padding: 32px 0 26px; border-block: 1px solid var(--line); margin-bottom: 36px; }
[data-role="home-routes"] { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
[data-role="home-routes"] [data-role="route"] { grid-column: auto; }
[data-role="key-note"] { max-width: 720px; padding: 30px 32px; background: var(--blue-wash); margin-bottom: 30px; }

/* The question worksheet remains a printable list without scripting. */
[data-role="worksheet-panel"] { background: var(--sheet); padding: 30px; border: 1px solid var(--line); margin-bottom: 38px; }
fieldset { border: 0; border-top: 1px solid var(--line); padding: 24px 0; margin: 24px 0 0; min-width: 0; }
legend { font: 600 18px/1.5 var(--sans); padding-right: 16px; }
[data-role="worksheet-choices"] { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; }
[data-role="worksheet-choice"] { display: flex; align-items: center; gap: 13px; min-height: 54px; padding: 12px; background: var(--paper); cursor: pointer; line-height: 1.5; font-size: 18px; }
input[type="checkbox"] { accent-color: var(--green); width: 44px; height: 44px; flex: 0 0 44px; margin: 0; cursor: pointer; }
[data-role="select-label"] { display: block; margin-bottom: 10px; font-size: 18px; }
select { width: 100%; max-width: 100%; min-height: 54px; border: 1px solid var(--quiet); background: var(--sheet); border-radius: 0; padding: 10px 36px 10px 14px; }
[data-role="worksheet-actions"] { display: flex; flex-wrap: wrap; gap: 12px; padding-top: 8px; }
button { min-height: 50px; border: 1px solid var(--blue); background: var(--sheet); font-size: 17px; line-height: 1.5; padding: 11px 17px; }
[data-role="question-sheet"] { padding: 0 6px; margin-bottom: 40px; }
[data-role="worksheet-output"] { padding-left: 1.4rem; }
[data-role="worksheet-output"] li { padding-block: 12px; border-bottom: 1px solid var(--line); margin: 0; }
[data-role="worksheet-status"] { font-size: 17px; color: var(--green); margin-top: 20px; }

@media (max-width: 1100px) {
  [data-role="masthead"], [data-role="reading"], [data-role="footer"] { width: calc(100% - 64px); }
  [data-role="chapter-opener"] { padding-left: 105px; }
  [data-role="chapter-body"], [data-page="home"] [data-role="chapter-body"] { grid-template-columns: 65px minmax(0, 1fr); }
  [data-page="home"] [data-role="chapter-opener"] { column-gap: 36px; }
  [data-page="home"] h1 { font-size: 52px; }
  [data-role="home-routes"] { grid-template-columns: 1fr; }
  [data-role="home-routes"] [data-role="route"] { display: grid; grid-template-columns: 210px 1fr; column-gap: 24px; }
  [data-role="home-routes"] [data-role="route"] a { grid-column: 2; }
}

@media (max-width: 760px) {
  [data-role="masthead"], [data-role="reading"], [data-role="footer"] { width: calc(100% - 40px); }
  [data-role="masthead"] { align-items: flex-start; flex-direction: column; gap: 12px; padding-block: 18px; }
  [data-role="wordmark"] { min-height: 58px; font-size: 26px; }
  [data-role="progressive-menu"] { width: 100%; }
  [data-role="menu-body"] { position: static; width: 100%; margin-top: 10px; max-height: none; box-shadow: 4px 4px 0 #dbe3d7; }
  [data-role="chapter-opener"] { padding: 36px 0 32px; }
  h1 { font-size: 39px; max-width: 21ch; line-height: 1.12; }
  h2 { font-size: 26px; }
  h3 { font-size: 25px; }
  [data-role="eyebrow"] { margin-bottom: 15px; }
  [data-role="opener"] { font-size: 20px; }
  [data-role="chapter-body"], [data-page="home"] [data-role="chapter-body"] { display: block; padding-block: 34px 42px; }
  [data-role="chapter-marker"] { display: none; }
  [data-role="chapter-section"] { margin-bottom: 35px; }
  [data-role="route-comparison"] { grid-template-columns: 1fr; gap: 14px; }
  [data-role="route"]:last-child:nth-child(odd) { grid-column: auto; }
  [data-role="term"] { grid-template-columns: 1fr; gap: 8px; padding-block: 18px; }
  [data-role="chapter-recap"] { padding: 23px; }
  [data-role="next-chapter"] { flex-direction: column; gap: 6px; padding-top: 25px; }
  [data-role="next-link"] { width: 100%; }
  [data-role="footer"] { grid-template-columns: 1fr; gap: 18px; padding-bottom: 30px; }
  [data-role="footer-links"] { justify-self: stretch; }
  [data-role="footer-links"] a { width: 100%; }
  [data-page="home"] [data-role="chapter-opener"] { grid-template-columns: 1fr; padding-block: 28px 34px; }
  [data-role="guide-frame"] { grid-column: 1; margin-bottom: 26px; padding-bottom: 19px; }
  [data-page="home"] h1 { font-size: 41px; max-width: 18ch; }
  [data-role="path-map"] { grid-column: 1; grid-row: auto; margin-top: 30px; padding: 23px; }
  [data-role="path-map"] figcaption { max-width: none; margin-bottom: 21px; }
  [data-role="home-routes"] [data-role="route"] { display: block; }
  [data-role="home-routes"] { gap: 20px; }
  [data-role="key-note"] { padding: 26px 23px; }
  [data-role="worksheet-panel"] { padding: 24px 20px; }
  [data-role="worksheet-choices"] { grid-template-columns: 1fr; }
  [data-role="worksheet-actions"] { flex-direction: column; }
  [data-role="worksheet-actions"] button { width: 100%; }
  [data-role="effect-comparison"] { padding: 22px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}

@media print {
  :root { --paper: #ffffff; --sheet: #ffffff; }
  body { font-size: 17px; line-height: 1.5; }
  [data-role="masthead"], [data-role="skip-link"], [data-role="chapter-marker"], [data-role="next-chapter"], [data-role="footer-links"], [data-role="worksheet-panel"], [data-role="worksheet-status"] { display: none; }
  [data-role="reading"], [data-role="footer"] { width: 100%; }
  [data-role="chapter-opener"], [data-page="home"] [data-role="chapter-opener"] { display: block; padding: 0 0 22px; }
  [data-role="chapter-body"], [data-page="home"] [data-role="chapter-body"] { display: block; padding-block: 24px; }
  [data-role="chapter-prose"] { max-width: none; }
  h1, [data-page="home"] h1 { font-size: 34px; max-width: none; }
  [data-role="path-map"] { margin-top: 24px; max-width: 500px; }
  [data-role="route-comparison"], [data-role="home-routes"] { display: block; }
  [data-role="route"] { break-inside: avoid; }
  h2, h3 { break-after: avoid; }
  [data-role="question-sheet"], [data-role="chapter-recap"] { break-inside: avoid; }
  [data-role="footer"] { display: block; padding-block: 20px; }
}