/* The user guide: a short topic menu at /guide and one small page per topic
   under /guide/. Same design tokens as the app: big type, big targets, AAA
   contrast. */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #444444;
  --color-primary: #1565c0;
  --color-primary-dark: #0d47a1;
  --color-yes-bg: #e8f5e9;
  --color-yes-text: #1b5e20;
  --color-no-bg: #fdecea;
  --color-no-text: #b71c1c;
  --color-neutral-bg: #eeeeee;
  --color-border: #757575;
  --radius: 16px;
  --gap: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 22px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
}

main {
  max-width: 560px;
  margin: 0 auto;
  padding: 0 var(--gap) 48px;
}

header.guide-header {
  max-width: 560px;
  margin: 0 auto;
  padding: 16px var(--gap) 0;
}

h1 {
  font-size: 30px;
  margin: 0 0 4px;
}
/* a topic page's title sits under the "← Help menu" button, not at the top */
main > h1:first-child {
  margin-top: 20px;
}

/* the tool's own picture beside a page's title, and in its "Open this
   tool" button: the same drawing the app's menu shows */
.h1-pic {
  width: 40px;
  height: 40px;
  vertical-align: -6px;
}
.open-pic {
  width: 32px;
  height: 32px;
  /* a white tile, so the picture reads on the blue button */
  padding: 3px;
  background: #fff;
  border-radius: 8px;
}

/* a button in the middle of a page (set-up's "Open set-up") */
.page-action {
  margin: 20px 0;
  text-align: center;
}

.subtitle {
  color: var(--color-muted);
  margin: 0 0 8px;
  font-size: 20px;
}

/* the short videos, folded under the title: a big button each, and the
   video opens under it (js/guide-video.js fetches it only then). Phone-shaped,
   so no wider than a phone's screen, even on an iPad. */
.tours { display: grid; gap: 10px; margin: 12px 0 4px; }
.tour summary {
  display: flex; align-items: center; gap: 12px; min-height: 56px;
  padding: 8px 16px; border-radius: var(--radius); cursor: pointer; list-style: none;
  background: var(--color-primary); color: #fff; font-size: 22px; font-weight: 700;
}
.tour summary::-webkit-details-marker { display: none; }
.tour summary:focus-visible { outline: 3px solid var(--color-primary-dark); outline-offset: 3px; }
.tour-play {
  display: inline-grid; place-items: center; width: 36px; height: 36px; flex: none;
  border-radius: 50%; background: #fff; color: var(--color-primary); font-size: 16px;
}
.tour[open] .tour-play { transform: rotate(90deg); }
.tour-len { margin-left: auto; font-size: 17px; font-weight: 400; opacity: 0.9; white-space: nowrap; }
.tour video {
  display: block; width: 100%; max-width: 360px; height: auto; margin: 12px auto 4px;
  border-radius: var(--radius); background: #0d47a1;
}

h2 {
  font-size: 26px;
  margin: 40px 0 12px;
  padding-top: 24px;
  border-top: 3px solid var(--color-neutral-bg);
  scroll-margin-top: 12px; /* breathing room when a #link jumps here */
}

/* Every h2/h3 has an id, so any section can be linked or bookmarked on
   its own. The 🔗 makes that discoverable — padding pads its tap target
   well past the glyph itself without shoving the heading text around. */
.anchor-link {
  display: inline-block;
  margin-left: 2px;
  padding: 18px 14px;
  font-size: 0.55em;
  text-decoration: none;
  opacity: 0.6;
}
.anchor-link:active { opacity: 1; }

.step-icon {
  font-size: 30px;
}

p {
  margin: 12px 0;
}

ol.steps {
  margin: 12px 0;
  padding-left: 0;
  list-style: none;
  counter-reset: step;
}

ol.steps>li {
  counter-increment: step;
  position: relative;
  padding-left: 56px;
  margin-bottom: 20px;
  min-height: 44px;
}

ol.steps>li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

figure {
  margin: 20px 0;
  text-align: center;
}

figure img {
  width: 100%;
  max-width: 300px;
  /* the width/height attributes reserve layout space; without this the
     attribute height would win over the scaled-down CSS width */
  height: auto;
  border: 3px solid var(--color-border);
  border-radius: var(--radius);
}

figcaption {
  font-size: 18px;
  color: var(--color-muted);
  margin-top: 8px;
}

.callout {
  border-radius: var(--radius);
  padding: 16px;
  margin: 16px 0;
  font-weight: 600;
}

.callout.yes {
  background: var(--color-yes-bg);
  color: var(--color-yes-text);
}

.callout.no {
  background: var(--color-no-bg);
  color: var(--color-no-text);
}

.callout.tip {
  background: var(--color-neutral-bg);
  color: var(--color-text);
}

/* a worked example, in the app's own colour for an amount answer
   (#0d47a1 on #e3f2fd, 7.5:1) */
.callout.example {
  background: #e3f2fd;
  color: var(--color-primary-dark);
}

/* something that matters more than a tip: a student's right, a limit of
   the app. The app's blue (#0d47a1 on #e3f2fd, 7.5:1), with a bar. */
.callout.key {
  background: #e3f2fd;
  color: var(--color-primary-dark);
  border-left: 8px solid var(--color-primary);
}

/* two screenshots side by side where there is room (an iPad), one above
   the other on a phone */
.figures {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 20px;
}
.figures figure {
  flex: 1 1 220px;
  max-width: 250px;
}

.platform {
  border: 3px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 20px 0;
}

.platform h3 {
  font-size: 24px;
  margin: 0 0 8px;
  scroll-margin-top: 12px;
}

.inline-icon {
  display: inline-block;
  vertical-align: -6px;
  width: 28px;
  height: 28px;
}

.illustration {
  display: block;
  margin: 16px auto;
  max-width: 320px;
  width: 100%;
  height: auto;
}

/* Leaves the guide for a manufacturer's own page, so it is a plain link
   rather than one of the big buttons — but still a full-size tap target. */
a.help-link {
  /* inline-block, not flex: the text wraps to two lines on a phone, and a
     centred flex item would leave the 🔗 stranded beside the middle of it */
  display: inline-block;
  padding: 14px 0;
  font-weight: 700;
  color: var(--color-primary-dark);
}

/* ---------- the topic menu (/guide) ---------- */
/* One big button per topic, the same shape as the app's own buttons, so
   the guide reads as a short list to pick from rather than a long page. */
.group-label {
  margin: 28px 0 10px;
  padding: 0;
  border: none;
  font-size: 20px;
  color: var(--color-muted);
}

.topics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

a.topic {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 72px;
  padding: 12px 16px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  text-decoration: none;
  background: #fff;
  border: 3px solid var(--color-border);
  border-radius: var(--radius);
}
a.topic::after {
  content: "›";
  margin-left: auto;
  padding-left: 8px;
  font-size: 34px;
  line-height: 1;
  color: var(--color-muted);
}
a.topic:active { background: #e3f2fd; }

.topic-icon {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  font-size: 30px;
  text-align: center;
}
/* the app's own pictures (js/pictures.js), as on its menu, so the guide
   looks the same on every phone and iPad */
.topic-icon img {
  display: block;
  width: 44px;
  height: 44px;
}
/* the app's own note and coin drawings, as on its menu */
.topic-icon svg { display: block; height: auto; }
.topic-icon .note-svg { width: 50px; }
.topic-icon .coin-svg { width: 36px; }
.topic-icon .note-svg + .coin-svg {
  width: 24px;
  margin: 14px 0 0 -20px;
}

/* ---------- moving around ---------- */
/* "← Help menu" at the top of every topic page, and again at its end next
   to "Open the app": quieter than the blue button, still easy to hit. */
a.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 56px;
  padding: 8px 20px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary-dark);
  text-decoration: none;
  background: #fff;
  border: 3px solid var(--color-border);
  border-radius: 999px;
}
a.back-link:active { background: #e3f2fd; }

.page-end {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 36px;
}

a.open-app {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 56px;
  padding: 12px 24px;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  background: var(--color-primary);
  border-radius: var(--radius);
  text-decoration: none;
}

a.open-app:active {
  background: var(--color-primary-dark);
}

/* a link inside the words, to another topic: the app's dark blue, bold, so
   it reads as a link without relying on colour alone (it keeps its line) */
main a:not([class]) {
  color: var(--color-primary-dark);
  font-weight: 700;
}

a:focus-visible {
  outline: 4px solid var(--color-primary);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: no-preference) {
  a.open-app,
  a.back-link,
  a.topic {
    transition: background 0.15s;
  }
}