:root {
  color-scheme: light;
  --ink: #15131f;
  --muted: #6b6878;
  --purple: #593bfb;
  --purple-light: #7c5cff;
  --purple-deep: #4a2fd6;
  --teal: #5ce0b8;
  --teal-deep: #1fb890;
  --green: #06231b;
  --surface: #f6f5fa;
  --line: #e6e4ef;
  --pressed: #eceaf4;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body { margin: 0; color: var(--ink); background: #fff; font: 20px/1.6 Georgia, 'Times New Roman', serif; font-variant-numeric: tabular-nums; }
h1, h2, h3, p, ul, ol, dl, figure { margin-top: 0; }
h1, h2, h3 { font-weight: 800; line-height: 1.12; letter-spacing: -.035em; }
h1 { font-size: clamp(40px, 4.6vw, 68px); margin-bottom: 24px; }
h2 { font-size: 34px; margin-bottom: 20px; }
h3 { font-size: 25px; margin-bottom: 12px; }
p { margin-bottom: 20px; }
p, li { max-width: 68ch; }
ul, ol { padding-left: 24px; }
li { margin-bottom: 12px; }
a { color: var(--purple-deep); text-decoration-thickness: 1px; text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
button, summary { cursor: pointer; font: inherit; }
button { color: var(--ink); }
button, a, summary { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--purple-deep); outline-offset: 5px; }
img { display: block; max-width: 100%; height: auto; }
strong { font-weight: 700; }
small { font-size: 16px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
[hidden] { display: none !important; }
.wrap { width: min(1280px, calc(100% - 80px)); margin-inline: auto; }
.flow > :last-child { margin-bottom: 0; }
.skip-link { position: absolute; z-index: 20; top: -90px; left: 20px; padding: 12px 20px; background: var(--ink); color: #fff; border-radius: 10px; }
.skip-link:focus { top: 12px; }
.utility-strip { background: var(--surface); border-bottom: 1px solid var(--line); }
.utility-strip > div { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 52px; font-size: 16px; }
.utility-strip p { margin: 0; }
.term-toggle { background: transparent; border: 1px solid var(--purple-light); border-radius: 10px; padding: 8px 16px; min-height: 44px; color: var(--purple-deep); font-size: 16px; font-weight: 700; }
.term-toggle[aria-pressed=true] { background: var(--pressed); }
.masthead { display: flex; gap: 24px; align-items: center; min-height: 104px; }
.wordmark { color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 12px; line-height: 1.1; padding-block: 12px; }
.wordmark strong { font-size: 27px; display: block; letter-spacing: -.03em; }
.wordmark span:not(.route-symbol) { display: block; font-size: 16px; color: var(--muted); margin-top: 4px; }
.route-symbol { display: inline-block; width: 36px; height: 36px; border: 3px solid var(--purple); border-radius: 50% 50% 50% 7px; transform: rotate(-45deg); flex: none; }
.route-symbol::after { content: ''; display: block; width: 10px; height: 10px; background: var(--teal); border-radius: 50%; margin: 10px; }
.quick-nav { display: flex; gap: 24px; margin-left: auto; }
.quick-nav a { display: inline-flex; align-items: center; justify-content: center; min-width: 40px; min-height: 48px; font-size: 18px; color: var(--ink); text-decoration: none; }
.quick-nav a[aria-current=page] { color: var(--purple-deep); border-bottom: 2px solid var(--purple); }
.guide-menu { position: relative; flex: none; }
.guide-menu summary { min-height: 48px; display: flex; align-items: center; gap: 12px; padding: 8px 16px; border: 1px solid var(--line); border-radius: 10px; font-size: 18px; font-weight: 700; list-style: none; }
.guide-menu summary::-webkit-details-marker { display: none; }
.guide-menu summary::after { content: '+'; color: var(--purple-deep); font-size: 26px; line-height: 1; }
.guide-menu[open] summary { background: var(--pressed); }
.guide-menu[open] summary::after { content: '−'; }
.menu-panel { position: absolute; right: 0; top: calc(100% + 12px); z-index: 10; width: min(840px, calc(100vw - 48px)); padding: 28px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: 0 12px 48px #14122818; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.menu-panel p { color: var(--muted); font-size: 16px; margin-bottom: 8px; }
.menu-panel a { display: flex; align-items: center; min-height: 48px; padding-block: 8px; font-size: 17px; text-decoration: none; border-bottom: 1px solid var(--line); }
.menu-panel a[aria-current=page] { color: var(--ink); font-weight: 700; }
.home-hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: 40px; align-items: center; padding: 28px 0 48px; }
.eyebrow { display: block; font-size: 16px; letter-spacing: .05em; font-weight: 700; margin-bottom: 20px; }
.badge { display: inline-block; background: var(--teal); color: var(--green); border-radius: 100px; padding: 8px 16px; font-size: 16px; font-weight: 700; margin-bottom: 24px; }
.home-hero h1 { max-width: 12ch; }
.home-hero .lead { font-size: 22px; max-width: 35ch; }
.home-art { position: relative; margin: 0; padding-bottom: 20px; }
.home-art img { border-radius: 20px; width: 100%; }
.home-art figcaption { position: absolute; bottom: 0; left: 24px; right: 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 20px; box-shadow: 0 2px 10px #14122814; }
.home-art figcaption strong { display: block; font-size: 24px; line-height: 1.15; }
.home-art figcaption span { display: block; font-size: 16px; color: var(--muted); margin-top: 4px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 12px; min-height: 52px; padding: 12px 24px; background: var(--purple); color: #fff; border: 1px solid var(--purple); border-radius: 10px; text-decoration: none; font-weight: 700; font-size: 18px; }
.button:hover { background: var(--purple-deep); text-decoration: none; }
.button-outline { background: #fff; color: var(--purple-deep); border-color: var(--purple-light); }
.button-outline:hover { background: var(--pressed); }
.action-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.grouped { background: var(--surface); padding: 64px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.section-head h2 { margin-bottom: 8px; }
.section-head p { margin: 0; max-width: 48ch; }
.route-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.route-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 24px; box-shadow: 0 2px 10px #1412280a; text-decoration: none; color: var(--ink); }
.route-card:hover { border-color: var(--purple-light); text-decoration: none; }
.route-card .card-tag { font-size: 16px; color: var(--purple-deep); margin-bottom: 24px; }
.route-card h3 { font-size: 26px; }
.route-card p { font-size: 18px; margin-bottom: 24px; }
.route-card .card-end { font-size: 18px; color: var(--purple-deep); margin-top: auto; font-weight: 700; }
.home-answer { padding: 64px 0; display: grid; grid-template-columns: .65fr 1fr; gap: 64px; }
.home-answer > div:last-child { max-width: 68ch; }
.source-note { margin: 24px 0 0; border-top: 1px solid var(--line); padding-top: 16px; color: var(--muted); font-size: 16px; }
.source-note p { margin: 0 0 8px; }
.source-note a { display: inline-flex; align-items: center; min-height: 44px; font-size: 16px; margin-right: 16px; }
.breadcrumb { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; padding-top: 12px; font-size: 16px; color: var(--muted); }
.breadcrumb a { display: inline-flex; align-items: center; min-height: 44px; }
.page-hero { padding: 32px 0 40px; border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 20ch; font-size: clamp(40px, 4vw, 60px); }
.page-hero .lead { max-width: 55ch; font-size: 23px; margin-bottom: 0; }
.reading-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 80px; padding-block: 48px 64px; }
.reading-grid article { max-width: 72ch; min-width: 0; }
.reading-grid article section { margin-bottom: 40px; scroll-margin-top: 24px; }
.reading-grid article section:last-child { margin-bottom: 0; }
.scenario { background: var(--surface); border-radius: 14px; padding: 28px; margin-bottom: 40px; }
.scenario .eyebrow { color: var(--purple-deep); margin-bottom: 12px; }
.scenario p { margin: 0; font-size: 22px; }
.takeaway { background: var(--teal); color: var(--green); border-radius: 14px; padding: 24px; margin: 32px 0; }
.takeaway h2, .takeaway h3 { font-size: 26px; }
.takeaway p { margin: 0; }
.question-list { padding: 0; list-style: none; counter-reset: none; }
.question-list li { border-bottom: 1px solid var(--line); padding: 12px 0; margin: 0; }
.question-list li::before { content: '↗'; color: var(--purple-deep); margin-right: 12px; }
.term-note { display: none; border-left: 3px solid var(--teal-deep); margin: 16px 0 24px; padding: 12px 20px; background: var(--surface); font-size: 18px; }
.terms-on .term-note { display: block; }
.term-note strong { display: block; margin-bottom: 4px; }
.route-aside { min-width: 0; }
.route-aside > div { position: sticky; top: 24px; }
.route-aside figure { margin-bottom: 24px; }
.route-aside img { border-radius: 14px; }
.route-aside figcaption { font-size: 16px; color: var(--muted); padding-top: 12px; }
.route-aside h2 { font-size: 25px; }
.route-aside a { display: flex; min-height: 48px; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 18px; text-decoration: none; }
.route-aside a::after { content: '↗'; margin-left: auto; }
.date-note { color: var(--muted); font-size: 16px; margin-bottom: 16px; }
.comparison { border: 1px solid var(--line); border-radius: 14px; overflow: hidden; margin: 24px 0; }
.comparison > div { padding: 24px; }
.comparison > div + div { border-top: 1px solid var(--line); }
.comparison > div:nth-child(even) { background: var(--surface); }
.comparison h3 { font-size: 26px; }
.comparison p:last-child { margin: 0; }
.next-route { position: sticky; bottom: 0; z-index: 8; padding: 16px 0; background: #ffffffed; backdrop-filter: blur(16px); border-top: 1px solid var(--line); }
.next-route .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.next-route p { margin: 0; line-height: 1.2; font-size: 18px; }
.next-route span { display: block; font-size: 16px; color: var(--muted); margin-bottom: 6px; }
footer { background: var(--surface); border-top: 1px solid var(--line); padding: 40px 0; }
footer .wrap { display: flex; justify-content: space-between; align-items: start; gap: 32px; }
footer p { max-width: 50ch; margin: 0; font-size: 18px; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 24px; }
footer a { display: inline-flex; align-items: center; min-height: 48px; font-size: 16px; }
.not-found { padding-block: 64px 80px; max-width: 70ch; }
.numerals { font-variant-numeric: tabular-nums; }
@media (max-width: 1000px) {
  .wrap { width: calc(100% - 48px); }
  .quick-nav { gap: 16px; }
  .quick-nav a { font-size: 16px; }
  .reading-grid { gap: 40px; grid-template-columns: minmax(0, 1fr) 260px; }
  .home-hero { gap: 24px; }
  .home-answer { gap: 40px; }
}
@media (max-width: 740px) {
  body { font-size: 18px; line-height: 1.65; }
  .wrap { width: calc(100% - 40px); }
  h2 { font-size: 29px; }
  .utility-strip > div { min-height: 56px; gap: 8px; }
  .utility-strip p { max-width: 20ch; line-height: 1.25; }
  .term-toggle { padding: 8px 12px; }
  .masthead { min-height: 92px; gap: 16px; justify-content: space-between; }
  .wordmark strong { font-size: 24px; }
  .route-symbol { width: 30px; height: 30px; }
  .route-symbol::after { margin: 7px; }
  .quick-nav { display: none; }
  .guide-menu summary { font-size: 16px; padding: 8px 12px; }
  .menu-panel { width: calc(100vw - 40px); padding: 24px; grid-template-columns: 1fr; max-height: 65vh; overflow-y: auto; }
  .menu-panel a { font-size: 18px; }
  .menu-panel p { margin-top: 8px; }
  .home-hero { display: block; padding: 24px 0 40px; }
  .home-hero h1 { max-width: 15ch; font-size: 44px; }
  .home-hero .lead { font-size: 20px; }
  .home-art { margin-top: 32px; padding-bottom: 16px; }
  .home-art figcaption { left: 16px; right: 16px; padding: 16px; }
  .home-art figcaption strong { font-size: 22px; }
  .home-art img { aspect-ratio: 1.25; object-fit: cover; }
  .button { font-size: 18px; padding-inline: 20px; }
  .grouped { padding: 40px 0; }
  .section-head { display: block; }
  .route-grid { grid-template-columns: 1fr; gap: 16px; }
  .route-card .card-tag { margin-bottom: 16px; }
  .route-card p { margin-bottom: 16px; }
  .home-answer { display: block; padding: 40px 0; }
  .home-answer > div + div { margin-top: 32px; }
  .page-hero { padding-block: 24px 32px; }
  .page-hero h1 { font-size: 40px; }
  .page-hero .lead { font-size: 21px; }
  .reading-grid { display: block; padding-top: 32px; padding-bottom: 40px; }
  .scenario { padding: 24px; margin-bottom: 32px; }
  .scenario p { font-size: 20px; }
  .reading-grid article section { margin-bottom: 32px; }
  .route-aside { margin-top: 40px; border-top: 1px solid var(--line); padding-top: 32px; }
  .route-aside > div { position: static; }
  .route-aside figure { display: none; }
  .next-route .wrap { gap: 12px; }
  .next-route p { font-size: 16px; max-width: 17ch; }
  .next-route .button { font-size: 16px; min-height: 52px; padding: 12px 16px; }
  footer .wrap { display: block; }
  footer nav { margin-top: 24px; gap: 8px 24px; }
  .not-found { padding-block: 40px 64px; }
}
@media (prefers-reduced-motion: no-preference) {
  .button, .term-toggle, .route-card { transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease; }
  .button:active, .term-toggle:active { transform: scale(.98); }
}
@media print {
  .utility-strip, .quick-nav, .guide-menu, .next-route, .route-aside, .skip-link { display: none; }
  body { font-size: 16px; }
  .wrap { width: 100%; }
  .reading-grid { display: block; }
  .term-note { display: block; }
  footer { background: #fff; }
}