/*
 * FM1Kit's page, in the manner of Apple's developer documentation: a dark hero with the
 * framework's abstract and availability, then plain reference pages in the system typeface.
 * Light and dark follow the system setting.
 */

:root {
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --bg: #fff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --rule: #d2d2d7;
  --link: #06c;
  --code-bg: #f5f5f7;
  --aside-bg: #fff8e6;
  --aside-rule: #c98b00;
  --hero-bg: #1d1d1f;
  --hero-text: #f5f5f7;
  --hero-muted: #a1a1a6;

  /* Xcode's default theme. */
  --syntax-keyword: #ad3da4;
  --syntax-type: #703daa;
  --syntax-string: #d12f1b;
  --syntax-comment: #5d6a76;
  --syntax-number: #272ad8;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --rule: #424245;
    --link: #2997ff;
    --code-bg: #1c1c1e;
    --aside-bg: #2b2210;
    --aside-rule: #f0b429;
    --hero-bg: #1c1c1e;
    --syntax-keyword: #ff7ab2;
    --syntax-type: #dabaff;
    --syntax-string: #ff8170;
    --syntax-comment: #7f8c98;
    --syntax-number: #d9c97c;
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.47 var(--font);
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

/* Links in running text are underlined, so they don't rely on colour alone. */
p a,
.aside a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

.wrap {
  max-width: calc(47rem + 44px);
  margin: 0 auto;
  padding: 0 22px;
}

/* The navigation bar. */
.nav {
  border-bottom: 1px solid var(--rule);
  font-size: 14px;
  letter-spacing: -0.01em;
}

.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 52px;
}

.nav .crumbs a {
  color: var(--muted);
}

.nav .crumbs .sep {
  margin: 0 0.45em;
  color: var(--muted);
}

.nav .version {
  color: var(--muted);
}

/* The hero. */
.hero {
  padding: 48px 0 40px;
  background: var(--hero-bg);
  color: var(--hero-text);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--hero-muted);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.011em;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 48px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.003em;
}

.abstract {
  max-width: 40rem;
  margin: 12px 0 0;
  font-size: 21px;
  line-height: 1.38;
  letter-spacing: 0.011em;
}

.availability {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  color: var(--hero-muted);
  font-size: 14px;
  letter-spacing: -0.01em;
}

.availability li::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 7px;
  border-radius: 50%;
  background: currentcolor;
  vertical-align: 2px;
}

/* The content. */
.content {
  padding-top: 40px;
  padding-bottom: 64px;
}

h2 {
  margin: 48px 0 16px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
  font-size: 32px;
  font-weight: 600;
  line-height: 1.125;
  letter-spacing: 0.004em;
}

.content > h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

h3 {
  margin: 32px 0 8px;
  font-size: 24px;
  font-weight: 600;
  line-height: 1.17;
  letter-spacing: 0.009em;
}

p {
  margin: 0 0 16px;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  letter-spacing: 0;
}

pre {
  margin: 0 0 24px;
  padding: 16px 18px;
  overflow-x: auto;
  border-radius: 12px;
  background: var(--code-bg);
  font: 14px/1.55 var(--mono);
  letter-spacing: 0;
}

pre code {
  font-size: inherit;
}

/* Code blocks can scroll sideways, so they take keyboard focus. */
pre:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

/* Syntax colours: keywords, types, strings, comments and numbers. */
.k {
  color: var(--syntax-keyword);
  font-weight: 600;
}

.t {
  color: var(--syntax-type);
}

.s {
  color: var(--syntax-string);
}

.c {
  color: var(--syntax-comment);
}

.n {
  color: var(--syntax-number);
}

/* Asides, as Apple's Important and Note boxes. */
.aside {
  margin: 0 0 24px;
  padding: 14px 18px;
  border-left: 4px solid var(--aside-rule);
  border-radius: 6px;
  background: var(--aside-bg);
  font-size: 15px;
}

.aside p {
  margin: 0;
}

.aside .label {
  display: block;
  margin-bottom: 2px;
  font-weight: 600;
}

/* Topics: symbol name, then its abstract. */
.topics {
  margin: 0;
  padding: 0;
  list-style: none;
}

.topics li {
  margin: 0 0 18px;
}

.topics .symbol {
  display: block;
  font: 600 15px/1.4 var(--mono);
  letter-spacing: 0;
}

.topics .symbol .kind {
  margin-right: 0.4em;
  color: var(--syntax-keyword);
}

.topics p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 15px;
}

footer {
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: -0.01em;
}

footer .wrap {
  padding-top: 16px;
  padding-bottom: 24px;
}

footer p {
  margin: 0 0 6px;
}