@font-face {
  font-family: "Field platform";
  src: url("/public/fonts/platform-variable.woff") format("woff");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --canvas: #0e0e10;
  --surface: #1a1b1e;
  --recess: #16171a;
  --bubble: #1e2240;
  --line: #2e2f33;
  --answer: #ececec;
  --dim: #9a9ba0;
  --reason: #8a8b90;
  --blue: #4d6bfe;
  --pressed: #3b57e0;
  --error: #e5484d;
  --success: #2ebd85;
  --sans: "Field platform", -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--answer);
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  font-optical-sizing: auto;
}
[hidden] { display: none !important; }
button, textarea { font: inherit; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
a {
  color: var(--answer);
  text-decoration-color: var(--blue);
  text-underline-offset: 5px;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible, summary:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 5px;
}
button { cursor: pointer; }
p { margin: 0 0 18px; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.025em; }
h1 { margin: 12px 0 24px; font-size: 44px; font-weight: 800; }
h2 { margin: 0 0 20px; font-size: 24px; font-weight: 700; }
strong { font-weight: 650; }
figure { margin: 0; }
ul { margin: 0; }

[data-role="skip"] {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 5;
  padding: 12px 20px;
  border: 1px solid var(--blue);
  background: var(--surface);
  border-radius: 8px;
  font-size: 18px;
}
[data-role="skip"]:focus { top: 16px; }
[data-role="site-header"] {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 32px;
  border-bottom: 1px solid var(--line);
}
[data-role="site-header"] nav { display: flex; align-items: center; gap: 8px; }
[data-role="header-right"] { justify-content: flex-end; }
[data-role="site-header"] nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 8px 12px;
  font-size: 16px;
  font-weight: 550;
  text-decoration: none;
  border-radius: 8px;
  white-space: nowrap;
}
[data-role="site-header"] nav a[aria-current="page"] { background: var(--bubble); box-shadow: inset 0 -2px var(--blue); }
[data-role="site-header"] nav a:hover { background: var(--surface); }
[data-role="identity"] {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  text-decoration: none;
  font-size: 20px;
  font-weight: 650;
  line-height: 1.15;
}
[data-role="identity-caption"] { display: block; color: var(--dim); font-size: 16px; font-weight: 450; margin-top: 4px; }
[data-role="mark"] { position: relative; width: 32px; height: 36px; flex: 0 0 32px; border-left: 3px solid var(--blue); border-top: 3px solid var(--blue); border-bottom: 3px solid var(--blue); border-radius: 4px 0 0 4px; }
[data-role="mark"]::before, [data-role="mark"]::after { content: ""; position: absolute; left: 7px; height: 2px; background: var(--blue); border-radius: 4px; }
[data-role="mark"]::before { width: 19px; top: 9px; }
[data-role="mark"]::after { width: 12px; top: 19px; }

[data-role="main"] { max-width: 720px; margin: 0 auto; padding: 48px 0 64px; }
body[data-page="start"] [data-role="main"] { max-width: 1088px; }
[data-role="hero"] { display: grid; grid-template-columns: minmax(0, 720px) minmax(0, 272px); align-items: start; gap: 48px; margin-bottom: 48px; }
[data-role="hero-copy"] { min-width: 0; }
[data-role="hero-copy"] p:last-child { margin-bottom: 0; }
[data-role="hero-copy"] > p:not([data-role]) { max-width: 62ch; }
[data-role="page-intro"] { margin-bottom: 36px; }
[data-role="eyebrow"] { margin-bottom: 4px; color: var(--dim); font-size: 16px; font-weight: 550; letter-spacing: 0.07em; }
[data-role="reading-column"] { max-width: 720px; min-width: 0; }
[data-role="atmosphere"] { margin: 32px 0 40px; }
[data-role="hero"] [data-role="atmosphere"] { margin: 0; }
[data-role="image-frame"] { overflow: hidden; background: var(--recess); border: 1px solid var(--line); border-radius: 10px; }
[data-role="atmosphere"] img { display: block; width: 100%; height: auto; aspect-ratio: 8 / 5; object-fit: cover; color: transparent; font-size: 0; }
[data-role="hero"] [data-role="atmosphere"] img { aspect-ratio: 3 / 4; }
figcaption { margin-top: 12px; color: var(--dim); font-size: 16px; font-weight: 500; line-height: 1.5; }

[data-role="page-map"] { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin-bottom: 36px; }
summary { cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::marker { content: ""; }
[data-role="page-map"] > summary, [data-role="context"] > summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; font-size: 18px; font-weight: 550; }
summary span[aria-hidden] { color: var(--dim); font-size: 24px; font-weight: 400; }
details[open] > summary span[aria-hidden] { transform: rotate(45deg); }
[data-role="page-map"] nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 4px; padding: 8px 0 16px; }
[data-role="page-map"] nav a { display: flex; align-items: center; min-height: 48px; padding: 8px 12px; font-size: 16px; text-decoration: none; border-radius: 8px; }
[data-role="page-map"] a[aria-current] { background: var(--bubble); border-left: 2px solid var(--blue); }
[data-role="page-map"] a:hover { background: var(--surface); }
[data-role="reader-question"] { max-width: 78%; width: fit-content; margin: 0 0 18px auto; padding: 16px 20px; border-radius: 18px 18px 4px 18px; background: var(--bubble); }
[data-role="reader-question"] p { margin: 0; font-size: 20px; font-weight: 550; line-height: 1.5; }
[data-role="context"] { margin: 18px 0 36px; padding: 0 16px; border-left: 2px solid var(--blue); border-radius: 0 10px 10px 0; background: var(--recess); }
[data-role="context"] > summary { color: var(--dim); font-size: 16px; }
[data-role="context"] p { color: var(--reason); font-size: 18px; line-height: 1.6; font-style: italic; margin: 0; padding-bottom: 18px; }
[data-role="answer-section"] { margin: 36px 0; }
[data-role="answer-section"] p:last-child { margin-bottom: 0; }
[data-role="question-list"] { padding-left: 24px; }
[data-role="question-list"] li { margin-bottom: 12px; padding-left: 4px; }
[data-role="question-list"] li::marker { color: var(--dim); }
[data-role="route-grid"] { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
[data-role="route-grid"] > a { display: flex; flex-direction: column; gap: 12px; padding: 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); text-decoration: none; }
[data-role="route-grid"] > a:hover { border-color: var(--blue); }
[data-role="route-grid"] strong { font-size: 22px; line-height: 1.25; }
[data-role="route-grid"] a > span:last-child { color: var(--dim); font-size: 18px; line-height: 1.5; }
[data-role="small-label"] { display: block; color: var(--dim); font-size: 16px; font-weight: 550; line-height: 1.5; }

[data-role="comparison"] { margin: 32px 0 40px; }
table { width: 100%; border-collapse: collapse; table-layout: fixed; }
caption { text-align: left; padding-bottom: 16px; font-size: 24px; font-weight: 700; line-height: 1.3; letter-spacing: -0.02em; }
thead { background: var(--surface); }
th, td { text-align: left; vertical-align: top; padding: 16px; border-bottom: 1px solid var(--line); overflow-wrap: break-word; }
thead th { font-size: 18px; font-weight: 600; line-height: 1.4; }
thead th:first-child { width: 24%; border-radius: 8px 0 0 0; }
thead th:last-child { border-radius: 0 8px 0 0; }
tbody th { font-size: 18px; font-weight: 550; line-height: 1.5; color: var(--dim); }
td { font-size: 18px; line-height: 1.6; }

[data-role="resource-link"] { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; margin: 20px 0; padding: 12px 16px; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; font-size: 18px; }
[data-role="resource-link"]:hover { border-color: var(--blue); }
[data-role="resource-link"] > span[aria-hidden] { color: var(--blue); font-size: 24px; }
[data-role="next-note"] { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 120px; padding: 24px 0; margin-top: 40px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); text-decoration: none; }
[data-role="next-note"] strong { display: block; font-size: 24px; line-height: 1.3; margin: 8px 0; }
[data-role="next-note"] > span:first-child > span:last-child { display: block; color: var(--dim); font-size: 18px; }
[data-role="next-note"] > span[aria-hidden] { flex: 0 0 44px; text-align: center; color: var(--blue); font-size: 28px; }

[data-role="notebook"] { margin: 48px 0; }
[data-role="notebook-heading"] { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
[data-role="notebook-heading"] h2 { margin-bottom: 12px; }
[data-role="notebook-heading"] > span { flex-shrink: 0; }
[data-role="note-help"] { color: var(--dim); font-size: 18px; margin-bottom: 20px; }
[data-role="note-modes"] { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
[data-role="note-modes"] button { min-height: 48px; border: 1px solid var(--line); background: transparent; color: var(--answer); border-radius: 25px; padding: 8px 20px; font-size: 18px; font-weight: 550; }
[data-role="note-modes"] button[aria-pressed="true"] { background: var(--bubble); border-color: var(--blue); }
[data-role="note-modes"] button:hover { border-color: var(--blue); }
[data-role="note-form"] label { display: block; font-size: 16px; margin-bottom: 12px; }
[data-role="composer"] { display: flex; align-items: flex-end; gap: 8px; padding: 12px; border: 1px solid var(--line); border-radius: 25px; background: var(--surface); }
[data-role="composer"] textarea { min-width: 0; flex: 1; background: transparent; color: var(--answer); border: 0; resize: vertical; min-height: 64px; max-height: 320px; padding: 8px 4px 8px 8px; font-size: 18px; line-height: 1.5; }
textarea::placeholder { color: var(--dim); opacity: 1; }
[data-role="composer"] textarea:focus-visible { outline-offset: 0; border-radius: 8px; }
[data-role="save-note"] { flex: 0 0 48px; width: 48px; height: 48px; margin-bottom: 2px; border: 0; border-radius: 50%; background: var(--blue); color: #ffffff; font-size: 28px; line-height: 1; }
[data-role="save-note"]:hover, [data-role="save-note"]:active { background: var(--pressed); }
[data-role="save-status"] { min-height: 28px; margin: 12px 4px 16px; font-size: 16px; color: var(--dim); }
[data-role="save-status"][data-state="success"] { color: var(--success); }
[data-role="save-status"][data-state="error"] { color: var(--answer); border-left: 2px solid var(--error); padding-left: 12px; }
[data-role="saved-notes"] { padding: 0; list-style: none; }
[data-role="saved-notes"] li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
[data-role="saved-notes"] li > p { grid-column: 1; margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 18px; }
[data-role="saved-notes"] li > span { grid-column: 1; font-size: 16px; color: var(--dim); }
[data-role="saved-notes"] button { grid-column: 2; grid-row: 1 / span 2; align-self: center; min-height: 48px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: var(--answer); font-size: 16px; }
[data-role="saved-notes"] button:hover { border-color: var(--blue); }
[data-role="empty-notes"], [data-role="copy-note"] { color: var(--dim); font-size: 18px; }

[data-role="sources"] { margin: 48px 0 0; padding: 24px; background: var(--recess); border: 1px solid var(--line); border-radius: 10px; }
[data-role="sources-top"] h2 { margin-bottom: 8px; }
[data-role="sources-top"] > a { display: inline-flex; align-items: center; gap: 12px; min-height: 48px; font-size: 16px; }
[data-role="checked"] { color: var(--dim); margin: 12px 0 20px; font-size: 16px; font-family: var(--mono); }
[data-role="sources"] ul { padding: 0; list-style: none; }
[data-role="sources"] li { padding: 16px 0; border-top: 1px solid var(--line); }
[data-role="sources"] li > a { display: flex; gap: 12px; align-items: flex-start; min-height: 48px; padding: 8px 0; text-decoration: none; font-size: 18px; line-height: 1.5; }
[data-role="sources"] li > a > span:last-child { text-decoration: underline; text-decoration-color: var(--blue); text-underline-offset: 5px; }
[data-role="citation"] { display: inline-flex; justify-content: center; align-items: center; flex: 0 0 28px; height: 28px; border: 1px solid var(--blue); border-radius: 4px; background: var(--bubble); color: var(--answer); font-family: var(--mono); font-size: 20px; font-weight: 600; line-height: 1; }
[data-role="sources"] li > p { margin: 4px 0 0 40px; color: var(--dim); font-size: 16px; line-height: 1.5; }
[data-role="site-footer"] { max-width: 1200px; margin: 0 auto; padding: 32px; border-top: 1px solid var(--line); display: flex; align-items: flex-start; justify-content: space-between; gap: 48px; }
[data-role="site-footer"] p { max-width: 54ch; margin: 0; font-size: 16px; color: var(--dim); line-height: 1.6; }
[data-role="site-footer"] nav { display: flex; flex-direction: column; min-width: 164px; }
[data-role="site-footer"] a { display: inline-flex; align-items: center; min-height: 48px; padding: 8px 0; font-size: 16px; }

/* Narrow screens keep the reading order; the comparisons retain paired answers. */
@media (max-width: 1180px) {
  body[data-page="start"] [data-role="main"] { margin: 0 32px; }
  [data-role="hero"] { grid-template-columns: minmax(0, 2.5fr) minmax(0, 1fr); gap: 32px; }
  [data-role="site-header"] { gap: 12px; }
  [data-role="site-header"] nav { gap: 0; }
  [data-role="site-header"] nav a { padding-inline: 8px; }
}
@media (max-width: 900px) {
  [data-role="site-header"] { grid-template-columns: 1fr 1fr; gap: 8px 24px; }
  [data-role="identity"] { grid-column: 1 / -1; grid-row: 1; justify-self: center; margin-bottom: 8px; }
  [data-role="header-left"], [data-role="header-right"] { grid-row: 2; }
  [data-role="main"], body[data-page="start"] [data-role="main"] { max-width: 720px; margin: 0 auto; padding: 36px 24px 48px; }
  [data-role="hero"] { display: block; margin-bottom: 36px; }
  [data-role="hero"] [data-role="atmosphere"] { margin-top: 28px; }
  [data-role="hero"] [data-role="atmosphere"] img { aspect-ratio: 8 / 3; }
  [data-role="hero"] figcaption { max-width: 64ch; }
  [data-role="site-footer"] { gap: 24px; padding-inline: 24px; }
}
@media (max-width: 600px) {
  body { font-size: 18px; }
  h1 { font-size: 36px; letter-spacing: -0.025em; margin: 12px 0 20px; }
  h2, caption { font-size: 23px; }
  [data-role="site-header"] { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px; padding: 16px; }
  [data-role="identity"] { width: 100%; justify-content: center; margin-bottom: 12px; }
  [data-role="site-header"] nav { width: 100%; justify-content: center; gap: 8px; }
  [data-role="site-header"] nav a { padding: 8px 12px; }
  [data-role="main"], body[data-page="start"] [data-role="main"] { padding: 28px 16px 40px; }
  [data-role="hero-copy"] > p { font-size: 18px; }
  [data-role="hero-copy"] [data-role="eyebrow"] { font-size: 16px; }
  [data-role="hero"] [data-role="atmosphere"] img { aspect-ratio: 8 / 3; }
  [data-role="page-map"] { margin-bottom: 28px; }
  [data-role="page-map"] nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  [data-role="page-map"] nav a { padding: 10px 8px; }
  [data-role="reader-question"] { max-width: 88%; padding: 16px; }
  [data-role="reader-question"] p { font-size: 18px; }
  [data-role="context"] { margin-bottom: 28px; }
  [data-role="context"] p { font-size: 17px; }
  [data-role="answer-section"] { margin: 28px 0; }
  [data-role="route-grid"] { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  [data-role="route-grid"] > a { padding: 20px; }
  [data-role="comparison"] { margin: 28px 0 36px; }
  table, thead, tbody { display: block; }
  caption { display: block; }
  tr { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  thead { border-radius: 8px; }
  thead th { border: 0; min-width: 0; padding: 12px; }
  thead th:first-child { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  tbody tr { padding: 8px 0 12px; border-bottom: 1px solid var(--line); }
  tbody th { grid-column: 1 / -1; padding: 12px 12px 4px; color: var(--answer); font-weight: 650; }
  td, tbody th { border: 0; font-size: 17px; }
  td { padding: 8px 12px; min-width: 0; }
  td + td { border-left: 1px solid var(--line); }
  [data-role="notebook-heading"] { display: block; }
  [data-role="notebook-heading"] > span { margin-bottom: 12px; }
  [data-role="note-help"] { font-size: 17px; }
  [data-role="note-modes"] button { font-size: 17px; }
  [data-role="composer"] { padding: 8px; }
  [data-role="composer"] textarea { padding: 8px; font-size: 17px; }
  [data-role="sources"] { padding: 20px 16px; margin-top: 36px; }
  [data-role="sources"] li > a { font-size: 17px; }
  [data-role="checked"] { font-family: var(--sans); }
  [data-role="sources"] li > p { margin-left: 0; }
  [data-role="site-footer"] { display: block; padding: 24px 16px; }
  [data-role="site-footer"] nav { margin-top: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
@media print {
  :root { color-scheme: light; --canvas: #fff; --surface: #f5f6f8; --recess: #f5f6f8; --bubble: #ebefff; --answer: #111; --dim: #555; --reason: #555; --line: #ccc; }
  [data-role="site-header"], [data-role="page-map"], [data-role="notebook"], [data-role="next-note"], [data-role="site-footer"] nav { display: none; }
  [data-role="main"], body[data-page="start"] [data-role="main"] { max-width: 720px; margin: 0 auto; padding: 16px; }
  [data-role="hero"] { display: block; }
  [data-role="atmosphere"] { display: none; }
  [data-role="reader-question"] { max-width: 100%; }
  [data-role="sources"], [data-role="comparison"] { break-inside: avoid; }
}