/*
 * The published site's one stylesheet, copied to /assets/site.css by build-site.py.
 *
 * A separate file rather than a string inside the generator, so it can be read and edited as
 * CSS. The palette is the same one doc/images/generate.py draws the diagrams and the logo with,
 * which is why the artwork sits on these pages without looking pasted on.
 */

:root {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --border: #d5dbe1;
  --text: #1a1f24;
  --muted: #5b6672;
  --accent: #1a73e8;
  --accent-soft: #e8f0fe;
  --shadow: 0 1px 2px rgb(16 24 32 / 6%), 0 8px 24px rgb(16 24 32 / 5%);
  --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181c;
    --surface: #1e242a;
    --border: #39424b;
    --text: #e6eaee;
    --muted: #9aa5b1;
    --accent: #8ab4f8;
    --accent-soft: #1f2b3d;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 8px 24px rgb(0 0 0 / 30%);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

/* ---------- the bar every page carries ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.7rem clamp(1rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.masthead__home {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 650;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.masthead__home img { display: block; width: 26px; height: 26px; }

.masthead nav { margin-left: auto; display: flex; gap: 1.1rem; font-size: 0.92rem; }
.masthead nav a { color: var(--muted); text-decoration: none; }
.masthead nav a:hover,
.masthead nav a[aria-current="page"] { color: var(--text); }
.masthead nav a[aria-current="page"] { font-weight: 600; }

/* ---------- prose ---------- */

.prose {
  max-width: 46rem;
  margin: 0 auto;
  padding: 2.5rem clamp(1rem, 4vw, 2.5rem) 5rem;
}

.prose h1, .prose h2, .prose h3, .prose h4 {
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 2.4em 0 0.6em;
}
.prose h1 { font-size: 2.1rem; margin-top: 0; letter-spacing: -0.03em; }
.prose h2 { font-size: 1.4rem; padding-top: 0.6em; border-top: 1px solid var(--border); }
.prose h3 { font-size: 1.1rem; }
.prose h4 { font-size: 1rem; color: var(--muted); }
.prose > *:first-child { margin-top: 0; }

.prose p, .prose ul, .prose ol { margin: 1em 0; }
.prose li { margin: 0.35em 0; }
.prose li > ul, .prose li > ol { margin: 0.35em 0; }

.prose blockquote {
  margin: 1.4em 0;
  padding: 0.1em 0 0.1em 1.1em;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.prose img { max-width: 100%; height: auto; }

.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2.5em 0; }

/* Anchors appear on hover, so a heading can be linked without a permanent mark beside it. */
.prose .headerlink {
  margin-left: 0.4rem;
  color: var(--muted);
  text-decoration: none;
  opacity: 0;
  font-weight: 400;
}
.prose h2:hover .headerlink,
.prose h3:hover .headerlink,
.prose h4:hover .headerlink,
.prose .headerlink:focus { opacity: 1; }

/* ---------- code ---------- */

code, pre, kbd, samp { font-family: var(--mono); font-size: 0.875em; }

:not(pre) > code {
  padding: 0.15em 0.4em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  white-space: nowrap;
}

pre {
  margin: 1.4em 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  line-height: 1.55;
}
pre code { padding: 0; background: none; border: 0; white-space: pre; }

/* ---------- tables ---------- */

.prose table {
  width: 100%;
  margin: 1.5em 0;
  border-collapse: collapse;
  font-size: 0.94rem;
  display: block;
  overflow-x: auto;
}
.prose th, .prose td {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.prose thead th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-bottom-color: var(--text);
}
.prose tbody tr:last-child td { border-bottom: 0; }

/* ---------- the docs layout: sidebar beside prose ---------- */

.layout { display: block; }

@media (min-width: 60rem) {
  .layout {
    display: grid;
    grid-template-columns: 16rem minmax(0, 1fr);
    gap: clamp(1rem, 3vw, 3rem);
    align-items: start;
    max-width: 72rem;
    margin: 0 auto;
  }
  .layout .prose { margin-left: 0; padding-left: 0; padding-right: 2rem; }
}

.sidebar {
  padding: 2.5rem clamp(1rem, 4vw, 2.5rem) 0;
  font-size: 0.93rem;
}
@media (min-width: 60rem) {
  .sidebar { position: sticky; top: 4rem; padding-right: 0; max-height: calc(100vh - 5rem); overflow-y: auto; }
}

.sidebar h2 {
  margin: 0 0 0.8rem;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
}
.sidebar ul { list-style: none; margin: 0 0 2rem; padding: 0; }
.sidebar li { margin: 0; }
.sidebar a {
  display: block;
  padding: 0.3rem 0.7rem;
  margin-left: -0.7rem;
  border-radius: 7px;
  color: var(--muted);
  text-decoration: none;
}
.sidebar a:hover { background: var(--surface); color: var(--text); }
.sidebar a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* ---------- the landing page ---------- */

.hero {
  max-width: 52rem;
  margin: 0 auto;
  padding: clamp(3rem, 9vw, 6rem) clamp(1rem, 4vw, 2.5rem) 1rem;
  text-align: center;
}
.hero img { width: 84px; height: 84px; }
.hero h1 {
  margin: 1.2rem 0 0.4rem;
  font-size: clamp(2rem, 6vw, 2.9rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
}
.hero p { margin: 0 auto; max-width: 34rem; color: var(--muted); font-size: 1.08rem; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  /* Wider than the prose below it, so four cards sit in one row rather than leaving an orphan. */
  max-width: 64rem;
  margin: 2.5rem auto 0;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
}
.card {
  display: block;
  padding: 1.2rem 1.3rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: border-color 120ms ease, transform 120ms ease, box-shadow 120ms ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.card strong { display: block; font-size: 1.02rem; margin-bottom: 0.2rem; }
.card span { color: var(--muted); font-size: 0.92rem; line-height: 1.5; display: block; }

/* ---------- the API version list ---------- */

.versions { list-style: none; margin: 1.5rem 0 0; padding: 0; }
.versions li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--border);
}
.versions li > a:first-child { font-weight: 600; font-size: 1.02rem; }
.versions .files { margin-left: auto; display: flex; gap: 0.9rem; font-size: 0.88rem; }
.versions .files a { color: var(--muted); }
.tag {
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.6rem clamp(1rem, 4vw, 2.5rem);
  color: var(--muted);
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
}
.site-footer a { color: var(--muted); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}