:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --border: #d1d5db;
  --accent: #1d4ed8;
  --accent-text: #ffffff;
  --note-bg: #fffbeb;
  --note-border: #b45309;
  --code-bg: #eef2f7;
  --focus: #b45309;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 100%;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --surface: #111a2e;
    --text: #e5e7eb;
    --muted: #b6bfcc;
    --border: #334155;
    --accent: #93c5fd;
    --accent-text: #0b1120;
    --note-bg: #2a1f0a;
    --note-border: #f59e0b;
    --code-bg: #1e293b;
    --focus: #fbbf24;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  color: var(--text);
  border: 2px solid var(--focus);
  border-radius: 0.375rem;
}

.skip-link:focus {
  top: 1rem;
}

.site-header,
.site-footer {
  border-color: var(--border);
  border-style: solid;
  border-width: 0;
}

.site-header {
  border-bottom-width: 1px;
  background: var(--surface);
}

.site-footer {
  border-top-width: 1px;
  margin-top: 3rem;
  background: var(--surface);
}

.wrap {
  width: min(100% - 2rem, 48rem);
  margin-inline: auto;
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 0.875rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
}

.brand img {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
}

.nav ul,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration-thickness: 2px;
}

main {
  display: block;
  padding-block: 2rem 1rem;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h1 {
  font-size: clamp(1.875rem, 1.4rem + 2vw, 2.5rem);
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 0.75rem;
}

h3 {
  font-size: 1.125rem;
  margin: 1.75rem 0 0.5rem;
}

p,
ul,
ol,
dl,
table,
pre {
  margin: 0 0 1rem;
}

li + li {
  margin-top: 0.375rem;
}

.lead {
  font-size: 1.1875rem;
  color: var(--text);
}

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

.note {
  margin: 1.5rem 0;
  padding: 1rem 1.125rem;
  background: var(--note-bg);
  border-left: 0.3125rem solid var(--note-border);
  border-radius: 0.375rem;
}

.note > :last-child {
  margin-bottom: 0;
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

code {
  padding: 0.1em 0.3em;
  background: var(--code-bg);
  border-radius: 0.25rem;
  overflow-wrap: anywhere;
}

pre {
  padding: 0.875rem 1rem;
  overflow-x: auto;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  line-height: 1.5;
}

pre code {
  padding: 0;
  background: none;
  overflow-wrap: normal;
}

.button {
  display: inline-block;
  padding: 0.625rem 1rem;
  background: var(--accent);
  color: var(--accent-text);
  border-radius: 0.375rem;
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  text-decoration: underline;
}

.table-scroll {
  overflow-x: auto;
  margin: 0 0 1rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
}

table {
  width: 100%;
  margin: 0;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

tr:last-child > th,
tr:last-child > td {
  border-bottom: 0;
}

thead th {
  font-size: 0.9375rem;
}

/* How-it-works diagram: boxes and connectors are plain list items so the
   reading order matches the visual order for assistive technology. */
.diagram {
  margin: 1.5rem 0;
  padding: 1rem;
  border: 2px dashed var(--border);
  border-radius: 0.75rem;
}

.diagram figcaption {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

.diagram-label {
  margin: 0 0 0.75rem;
  font-weight: 700;
}

.flow {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow li {
  margin: 0;
}

.flow .node {
  padding: 0.875rem 1rem;
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: 0.5rem;
}

.flow .node strong {
  display: block;
  font-size: 1.0625rem;
}

.flow .node span {
  display: block;
  color: var(--muted);
  font-size: 0.9375rem;
}

.flow .link {
  position: relative;
  padding: 0.75rem 0 0.75rem 2.25rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

.flow .link::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 0;
  bottom: 0;
  border-left: 3px solid var(--accent);
}

@media (min-width: 46rem) {
  .flow {
    flex-direction: row;
    align-items: center;
  }

  .flow .node {
    flex: 1 1 0;
    align-self: stretch;
  }

  .flow .link {
    flex: 0 0 8.5rem;
    padding: 1.5rem 0.5rem 0;
    text-align: center;
  }

  .flow .link::before {
    left: 0.5rem;
    right: 0.5rem;
    top: 0.75rem;
    bottom: auto;
    border-left: 0;
    border-top: 3px solid var(--accent);
  }
}

.site-footer .wrap {
  padding-block: 1.5rem;
  font-size: 0.9375rem;
}

.site-footer p {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

@media print {
  .skip-link,
  .nav {
    display: none;
  }
}