/* One stylesheet for the presentation page and the documentation pages, so the site
   is one thing rather than a page and some Markdown. */
:root {
  --ink: #10151c;
  --dim: #55606f;
  --line: #e2e6eb;
  --paper: #ffffff;
  --wash: #f6f8fa;
  --brand: #2b6cb0;
  --brand-dark: #1f5185;
  --button: #2b6cb0;
  --button-dark: #1f5185;
  --accent: #b45309;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8ecf1;
    --dim: #a3aebd;
    --line: #263041;
    --paper: #0f141b;
    --wash: #151c26;
    --brand: #6aa8e6;
    --brand-dark: #8cc0f2;
    /* Links can be pale on a dark page; white text on a pale button cannot. */
    --button: #2f74bd;
    --button-dark: #3f88d4;
    --accent: #f0a552;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); }
a:hover { color: var(--brand-dark); }

.wrap { max-width: 860px; margin: 0 auto; padding: 0 22px; }

/* --- the bar --- */
.top {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 5;
}

.top .wrap {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 62px;
}

.mark {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--ink);
  font-size: 17px;
}

.mark img { height: 26px; width: 26px; border-radius: 5px; }
.mark strong { font-weight: 700; }

.top nav {
  margin-left: auto;
  display: flex;
  gap: 18px;
  font-size: 15px;
}

.top nav a { color: var(--dim); text-decoration: none; }
.top nav a:hover { color: var(--ink); }

/* --- the hero --- */
.hero { padding: 64px 0 12px; text-align: center; }

.hero h1 {
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.1;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}

.hero p.lead {
  font-size: clamp(18px, 2.4vw, 21px);
  color: var(--dim);
  margin: 0 auto 26px;
  max-width: 44ch;
}

.buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  background: var(--button);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}

.btn:hover { background: var(--button-dark); color: #fff; }

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn.ghost:hover { background: var(--wash); color: var(--ink); }

.note { color: var(--dim); font-size: 14px; margin-top: 14px; }

.shot {
  margin: 44px auto 0;
  max-width: 100%;
  /* The tag carries the picture's real size, so that the page does not jump as it
     loads. Without this the height stays at that size while the width shrinks. */
  height: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 10px 34px rgb(16 21 28 / 0.14);
  display: block;
}

/* --- sections --- */
section { padding: 52px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: 0; }

h2 { font-size: 27px; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 + p.sub { color: var(--dim); margin: 0 0 26px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  background: var(--wash);
}

.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--dim); font-size: 15px; }

pre, code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

pre {
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 14.5px;
}

:not(pre) > code {
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

table { border-collapse: collapse; width: 100%; font-size: 15px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 8px 11px; text-align: left; vertical-align: top; }
th { background: var(--wash); }

blockquote {
  margin: 0;
  padding: 2px 18px;
  border-left: 3px solid var(--line);
  color: var(--dim);
}

/* --- documentation pages --- */
.doc { padding: 40px 0 70px; }

/* Wider than the presentation page: the side navigation takes its width out of
   the same wrap, and the prose keeps a readable measure of its own. */
.doc .wrap { max-width: 1120px; }

.doc-grid {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  gap: 46px;
  align-items: start;
}

.doc-grid > article { max-width: 74ch; }

/* Below the bar, which is sticky itself, and never taller than what is left of
   the window, so a long list scrolls inside the column rather than pushing it. */
.side {
  position: sticky;
  top: 86px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
}

.side h2 {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--dim);
}

.side ul { margin: 0; padding: 0; list-style: none; }

.side a {
  display: block;
  padding: 7px 12px;
  border-left: 2px solid var(--line);
  color: var(--dim);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.35;
}

.side a:hover { color: var(--ink); background: var(--wash); }

.side a[aria-current] {
  border-left-color: var(--brand);
  color: var(--ink);
  font-weight: 600;
}

/* One column when there is no room for two: the list becomes a short header
   above the page instead of a rail beside it. */
@media (max-width: 900px) {
  .doc-grid { grid-template-columns: 1fr; gap: 22px; }

  .side {
    position: static;
    max-height: none;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
  }

  .side ul { display: flex; flex-wrap: wrap; gap: 4px; }
  .side a { border-left: 0; padding: 6px 10px; border-radius: 7px; background: var(--wash); }
}

.doc h1 { font-size: 32px; margin: 0 0 22px; letter-spacing: -0.02em; }
.doc h2 { margin-top: 38px; }
.doc h3 { margin-top: 26px; font-size: 18px; }
.doc img { max-width: 100%; }

.crumb { font-size: 14px; color: var(--dim); margin: 26px 0 0; }
.crumb a { text-decoration: none; }

/* --- foot --- */
footer {
  border-top: 1px solid var(--line);
  padding: 30px 0 50px;
  color: var(--dim);
  font-size: 14px;
}

footer a { color: var(--dim); }