:root {
  color-scheme: light;
  --cloud: #00aff0;
  --deep: #0078d4;
  --light-cloud: #34c3ff;
  --cloud-ink: #00343f;
  --ink: #1b1b1f;
  --muted: #6e6e78;
  --incoming: #ebebef;
  --group: #f4f4f6;
  --line: #d9d9e0;
  --green: #2dc26b;
  --red: #e8364f;
  --link: #006cbe;
  font-family: "Segoe UI", "Segoe UI Variable", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Roboto, Arial, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.48;
  overflow-wrap: break-word;
}
button, input, select, textarea { font: inherit; }
button, select { cursor: pointer; }
button { border: 0; }
a { color: var(--link); text-underline-offset: 4px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
a, button, select { -webkit-tap-highlight-color: #d5f2ff; }
img, svg { max-width: 100%; }
img { display: block; height: auto; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { line-height: 1.15; text-wrap: balance; }
h1 { font-size: 40px; font-weight: 800; letter-spacing: -.55px; max-width: 24ch; }
h2 { font-size: 28px; font-weight: 700; letter-spacing: -.3px; }
h3 { font-size: 24px; font-weight: 700; letter-spacing: -.2px; }
p, li, td, th, legend, label, figcaption, summary, a { font-size: max(1em, 16px); }
p + p { margin-top: 16px; }
ul, ol { margin: 20px 0; padding-left: 24px; }
li + li { margin-top: 12px; }
li { padding-left: 4px; }
li::marker { color: var(--deep); }
:focus-visible { outline: 3px solid var(--deep); outline-offset: 4px; }
[tabindex="-1"]:focus:not(:focus-visible) { outline: none; }
[hidden] { display: none !important; }

[data-component="skip"] {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 16px;
  transform: translateY(-180%);
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 12px;
  background: var(--cloud);
  color: var(--cloud-ink);
  font-weight: 700;
}
[data-component="skip"]:focus { transform: translateY(0); }

[data-component="masthead"] {
  max-width: 1160px;
  margin: 0 auto;
  padding: 24px 24px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}
[data-component="masthead-name"] { display: flex; gap: 12px; align-items: center; }
[data-component="masthead-name"] strong { display: block; font-size: 20px; line-height: 1.25; }
[data-component="masthead-name"] div > span { display: block; margin-top: 4px; font-size: 16px; color: var(--muted); }
[data-component="mark"] {
  display: grid;
  place-items: center;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  background: var(--cloud);
  color: var(--cloud-ink);
  border-radius: 14px 14px 14px 4px;
  font-size: 28px;
  font-weight: 700;
}
[data-component="masthead-note"] { display: none; font-size: 16px; color: var(--muted); }
[data-component="main"] { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
[data-component="hero"] { padding: 44px 0 36px; max-width: 760px; margin: 0 auto; }
[data-component="eyebrow"] {
  font-size: 16px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: .15px;
  line-height: 1.4;
  margin-bottom: 16px;
}
[data-component="lead"] { max-width: 60ch; font-size: 20px; line-height: 1.4; margin-top: 24px; }
[data-component="intro"] > [data-component="button"] { margin-top: 28px; }
[data-component="reading"] { max-width: 760px; margin: 0 auto; }
[data-component="section"] { padding: 32px 0; border-top: 1px solid var(--line); }
[data-component="section"] > h2 { margin-bottom: 20px; }
[data-component="section"] > p { max-width: 64ch; }
[data-component="chapter"] { padding: 32px 0; border-top: 1px solid var(--line); }
[data-component="chapter"] > h2 { margin-bottom: 28px; }
[data-component="subtopic"] + [data-component="subtopic"] { margin-top: 32px; }
[data-component="subtopic"] > h3 { margin-bottom: 16px; }
[data-component="subtopic"] > p { max-width: 64ch; }

[data-component="button"],
[data-component="quiet-button"],
[data-component="next-link"],
[data-component="text-link"],
[data-component="footer-link"] {
  min-height: 48px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  font-weight: 600;
  line-height: 1.35;
  font-size: 18px;
}
[data-component="button"] {
  background: var(--cloud);
  color: var(--cloud-ink);
  padding: 16px 24px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 20px;
  font-weight: 700;
}
[data-component="button"]:hover { background: #34c3ff; text-decoration: none; }
[data-component="quiet-button"] {
  background: #fff;
  color: var(--link);
  padding: 14px 20px;
  border: 1px solid #99b9d2;
  border-radius: 999px;
  justify-content: center;
}
[data-component="quiet-button"]:hover { background: #e9f6fc; }
[data-component="text-link"] { margin-top: 16px; }

[data-component="scene"] { margin: 28px 0; }
[data-component="scene-frame"] {
  overflow: hidden;
  border-radius: 24px;
  background: linear-gradient(165deg, #34c3ff 0%, #bceafe 44%, #f4f4f6 80%);
}
[data-component="scene-frame"] img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  color: transparent;
  font-size: 0;
}
[data-component="scene"] figcaption {
  font-size: 16px;
  color: var(--muted);
  padding: 12px 4px 0;
  max-width: 60ch;
}
[data-component="hero"][data-home="true"] { max-width: none; }
[data-hero="true"] { margin: 36px 0 0; }
[data-hero="true"] [data-component="scene-frame"] { border-radius: 28px 28px 28px 8px; }
[data-hero="true"] img { aspect-ratio: 4 / 3; }

[data-component="exchange"] { display: flex; flex-direction: column; gap: 20px; padding: 28px 0 16px; }
[data-component="bubble"] { position: relative; border-radius: 20px; padding: 20px 24px; margin: 0; }
[data-component="bubble"]::after { content: ""; position: absolute; width: 10px; height: 10px; bottom: -4px; transform: rotate(45deg); background: inherit; }
[data-side="in"] { align-self: flex-start; background: var(--incoming); color: var(--ink); max-width: 88%; }
[data-side="in"]::after { left: 16px; }
[data-side="out"] { align-self: flex-end; background: var(--deep); color: #fff; max-width: 94%; }
[data-side="out"]::after { right: 16px; }
[data-side="out"] p { margin: 0; }

[data-component="prompt"] {
  background: var(--group);
  border-radius: 20px 20px 20px 6px;
  margin: 24px 0;
  padding: 24px;
  border-left: 4px solid var(--cloud);
}
[data-component="prompt"] [data-component="eyebrow"] { color: #52525e; margin-bottom: 12px; }
[data-component="prompt"] p + p { margin: 0; }

[data-component="option-grid"], [data-component="compare-pair"] { display: grid; gap: 12px; margin: 24px 0; }
[data-component="option"] {
  padding: 28px 24px 20px;
  background: var(--group);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
[data-component="option"] h3 { margin-bottom: 16px; }
[data-component="option"] p { margin: 0 0 16px; }
[data-component="option"] [data-component="text-link"] { margin-top: auto; }

[data-component="comparison"] { width: 100%; border-collapse: collapse; margin-top: 24px; line-height: 1.4; }
[data-component="comparison"] caption { text-align: left; font-size: 18px; padding: 0 0 20px; }
[data-component="comparison"] thead { display: none; }
[data-component="comparison"] tbody { display: grid; gap: 16px; }
[data-component="comparison"] tr { display: grid; background: var(--group); border-radius: 20px; padding: 20px; }
[data-component="comparison"] th { text-align: left; font-weight: 700; padding-bottom: 16px; }
[data-component="comparison"] td { display: block; padding: 16px 0; border-top: 1px solid var(--line); font-size: 18px; }
[data-component="cell-label"] { display: block; font-weight: 700; margin-bottom: 8px; color: var(--link); font-size: 16px; }

[data-component="steps"] { list-style: none; padding: 0; margin: 0; }
[data-component="steps"] > li { margin: 0; padding: 32px 0 32px 28px; border-top: 1px solid var(--line); position: relative; }
[data-component="steps"] > li::before { content: ""; position: absolute; left: 0; top: 42px; width: 12px; height: 12px; border-radius: 50%; background: var(--green); border: 1px solid #1b783e; }
[data-component="steps"] h3 { margin-bottom: 16px; }

[data-component="onward"] { max-width: 760px; margin: 32px auto 0; padding: 28px; background: var(--deep); border-radius: 24px; color: #fff; }
[data-component="onward"] h2 { font-size: 26px; margin-bottom: 16px; }
[data-component="next-links"] { display: flex; flex-direction: column; gap: 12px; }
[data-component="next-link"] { text-decoration: none; background: var(--group); color: var(--link); padding: 16px 20px; border-radius: 16px; width: 100%; }
[data-component="next-link"]:hover { text-decoration: underline; }
[data-component="onward"] [data-component="next-link"] { background: #fff; }

[data-component="directory"] { margin: 40px auto 0; max-width: 760px; padding: 28px 0; border-top: 1px solid var(--line); }
[data-component="directory"] > h2 { margin-bottom: 24px; }
[data-component="directory"] summary { min-height: 56px; padding: 12px 0; font-size: 20px; font-weight: 700; cursor: pointer; }
[data-component="directory"] summary > span { float: right; color: var(--link); margin-left: 12px; }
[data-component="directory"] details[open] summary { margin-bottom: 20px; }
[data-component="topics"] { display: grid; gap: 8px; padding: 0; margin: 0; list-style: none; }
[data-component="topics"] li { padding: 0; margin: 0; }
[data-component="topic-link"] { display: flex; min-height: 56px; gap: 20px; align-items: center; justify-content: space-between; text-decoration: none; background: var(--group); border-radius: 12px; padding: 14px 16px; font-size: 18px; line-height: 1.35; font-weight: 500; }
[data-component="topic-link"]:hover { background: #e3f5fe; text-decoration: underline; }
[data-component="topic-link"][aria-current="page"] { background: var(--cloud); color: var(--cloud-ink); font-weight: 700; }

[data-component="footer"] { max-width: 1160px; margin: 36px auto 0; padding: 28px 24px 44px; border-top: 1px solid var(--line); }
[data-component="footer"] p { font-size: 16px; max-width: 72ch; }
[data-component="footer-links"] { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; margin-top: 16px; }
[data-component="footer-link"] { font-size: 16px; padding: 12px 0; }

[data-component="source-list"] { list-style: none; padding: 0; margin: 20px 0; }
[data-component="source-list"] li { margin: 0; padding: 0; }
[data-component="source-link"] { min-height: 56px; display: flex; align-items: center; justify-content: space-between; padding: 16px 0; gap: 20px; border-bottom: 1px solid var(--line); font-size: 18px; line-height: 1.4; }
[data-component="source-link"] span { flex-shrink: 0; text-decoration: none; }

[data-component="worksheet"] { border: 1px solid var(--line); border-radius: 24px; background: var(--group); padding: 24px; margin: 24px 0 32px; }
fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
legend { padding: 0; margin-bottom: 24px; font-size: 24px; line-height: 1.2; font-weight: 700; }
[data-component="field-grid"] { display: grid; gap: 24px; }
[data-component="field"] { margin-bottom: 24px; }
[data-component="field-grid"] [data-component="field"] { margin-bottom: 0; }
[data-component="field-grid"] + [data-component="field"] { margin-top: 24px; }
label { display: block; font-weight: 600; font-size: 18px; line-height: 1.35; margin-bottom: 12px; }
select { display: block; width: 100%; max-width: 100%; min-height: 56px; color: var(--ink); background: #fff; border: 1px solid #858592; border-radius: 16px; padding: 14px 12px; font-size: 18px; }
[data-component="worksheet-actions"] { display: flex; flex-direction: column; align-items: stretch; gap: 12px; margin-top: 24px; }
[data-component="worksheet-actions"] button { width: 100%; }
[data-component="question-sheet"] { border-radius: 24px; padding: 28px 24px; border: 2px solid var(--deep); background: #fff; margin: 24px 0 40px; }
[data-component="question-sheet"] h2 { margin-bottom: 20px; }
[data-component="question-sheet"] li { padding-left: 4px; }
[data-component="question-sheet"]:focus { outline: 3px solid var(--deep); outline-offset: 5px; }
[data-component="status"] { min-height: 27px; font-size: 16px; color: #3c5364; margin-top: 20px; }

@media (min-width: 680px) {
  body { font-size: 20px; }
  [data-component="masthead-note"] { display: block; }
  [data-component="main"] { padding: 0 36px; }
  [data-component="hero"] { padding: 56px 0 48px; }
  h1 { font-size: 52px; letter-spacing: -.6px; }
  h2 { font-size: 32px; }
  [data-component="lead"] { font-size: 23px; }
  [data-component="section"] { padding: 40px 0; }
  [data-component="chapter"] { padding: 40px 0; }
  [data-component="compare-pair"], [data-component="option-grid"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  [data-component="option-grid"] [data-component="option"]:last-child { grid-column: 1 / -1; }
  [data-component="topics"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  [data-component="comparison"] thead { display: table-header-group; }
  [data-component="comparison"] tbody { display: table-row-group; }
  [data-component="comparison"] tr { display: table-row; background: #fff; }
  [data-component="comparison"] th, [data-component="comparison"] td { display: table-cell; padding: 20px 16px; vertical-align: top; border-bottom: 1px solid var(--line); font-size: 18px; }
  [data-component="comparison"] thead th { background: var(--group); }
  [data-component="comparison"] th:first-child { width: 24%; }
  [data-component="comparison"] td { width: 38%; }
  [data-component="cell-label"] { display: none; }
  [data-component="footer-links"] { flex-direction: row; gap: 28px; }
  [data-component="field-grid"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  [data-component="worksheet"] { padding: 32px; }
  [data-component="worksheet-actions"] { flex-direction: row; flex-wrap: wrap; align-items: center; }
  [data-component="worksheet-actions"] button { width: auto; }
  [data-component="question-sheet"] { padding: 36px; }
}

@media (min-width: 960px) {
  [data-component="masthead"] { padding: 28px 36px 24px; }
  [data-component="hero"][data-home="true"] { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); align-items: center; gap: 56px; padding: 64px 0; }
  [data-home="true"] h1 { font-size: 58px; max-width: 14ch; }
  [data-home="true"] [data-component="lead"] { font-size: 22px; }
  [data-hero="true"] { margin: 0; }
  [data-hero="true"] img { aspect-ratio: 5 / 6; }
  .page-home [data-component="reading"], .page-home [data-component="directory"] { max-width: none; }
  .page-home [data-component="section"] > p, .page-home [data-component="exchange"], .page-home [data-component="prompt"] { max-width: 760px; }
  .page-home [data-component="subtopic"] > p { max-width: 760px; }
  [data-component="option-grid"] { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
  [data-component="option-grid"] [data-component="option"]:last-child { grid-column: auto; }
  .page-home [data-component="topics"] { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  [data-component="onward"] { margin-top: 48px; padding: 32px; }
  [data-component="footer"] { padding: 32px 36px 48px; }
}

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

@media print {
  body { font-size: 16px; color: #000; background: #fff; }
  [data-component="skip"], [data-component="masthead"], [data-component="directory"], [data-component="onward"], [data-component="footer-links"], [data-component="worksheet"], [data-component="worksheet-actions"], [data-component="scene"], [data-component="status"] { display: none !important; }
  [data-component="main"], [data-component="reading"], [data-component="hero"] { max-width: none; padding: 0; margin: 0; }
  h1 { font-size: 28px; max-width: none; }
  h2 { font-size: 22px; }
  [data-component="lead"] { font-size: 18px; margin-bottom: 20px; }
  [data-component="question-sheet"] { border: 1px solid #666; padding: 20px; margin: 20px 0; }
  [data-component="question-sheet"] li { break-inside: avoid; }
  .page-worksheet [data-component="reading"] > [data-component="section"] { display: none; }
  .page-worksheet [data-component="reading"] > [data-component="chapter"] { display: none; }
  [data-component="footer"] { margin: 20px 0 0; padding: 12px 0; }
  a { color: #000; }
}