/* The style of the agent-signals site. System fonts only, no external
   requests. Each text colour has a contrast of 4.5:1 or more on each
   background where it is used; each UI colour has 3:1 or more. */

:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1b1f24;
  --muted: #4d5563;
  --surface: #f3f5f7;
  --border: #d3d9e0;
  --border-strong: #6b7480;
  --link: #0a58a8;
  --link-hover: #073f78;
  --focus: #1d4ed8;
  --screen-bg: #fafbfc;
  --screen-fg: #1b1f24;
  --screen-border: #6b7480;
  --badge-bg: #fdecc8;
  --badge-fg: #5c3600;
  --scroll-shadow: rgb(0 0 0 / 0.22);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Liberation Sans", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", "DejaVu Sans Mono", "Liberation Mono", Menlo, Consolas, monospace;
  --measure: 70ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --fg: #e4e7eb;
    --muted: #a6aeba;
    --surface: #181c22;
    --border: #313945;
    --border-strong: #7c8694;
    --link: #7db8ff;
    --link-hover: #a9d0ff;
    --focus: #ffcc4d;
    --screen-bg: #0a0d10;
    --screen-fg: #d9dee4;
    --screen-border: #7c8694;
    --badge-bg: #3d2c00;
    --badge-fg: #ffd98a;
    --scroll-shadow: rgb(255 255 255 / 0.22);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

/* Links are underlined, so that colour is not the only sign. */
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--link-hover); text-decoration-thickness: 2px; }

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

main:focus { outline: none; }

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  z-index: 10;
  padding: 0.6rem 1rem;
  background: var(--bg);
  color: var(--link);
  border: 2px solid var(--focus);
  border-radius: 4px;
  font-weight: 600;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* Header and navigation */

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0.25rem 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 44px;
  color: var(--fg);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  white-space: nowrap;
}
.brand:hover { color: var(--fg); text-decoration: underline; }
.brand-mark {
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.05rem 0.35rem;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
}

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

.site-nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0 0.6rem;
  color: var(--fg);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.site-nav a:hover { color: var(--link); text-decoration: underline; }

/* The current section: bold text and a bar, not colour alone. */
.site-nav a[aria-current] {
  font-weight: 700;
  border-bottom-color: var(--link);
}

.nav-wide { display: none; }

.nav-menu > summary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.nav-menu > summary::-webkit-details-marker { display: none; }
.nav-menu > summary::after {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-25%) rotate(45deg);
}
.nav-menu[open] > summary::after { transform: translateY(15%) rotate(-135deg); }

.nav-menu > ul {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 5;
  padding: 0.25rem 1rem 0.75rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 6px 12px rgb(0 0 0 / 0.12);
}
.nav-menu > ul a {
  border-bottom: 0;
  border-left: 4px solid transparent;
  padding-left: 0.75rem;
}
.nav-menu > ul a[aria-current] { border-left-color: var(--link); }

/* The wide navigation with nine items needs about 60em on one row. The
   breakpoint keeps a margin for wider fonts, so that the row does not wrap. */
@media (min-width: 70em) {
  .nav-menu { display: none; }
  .nav-wide { display: flex; flex-wrap: wrap; gap: 0 0.15rem; }
}

/* Main content */

main {
  display: block;
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

main > p, main > ul, main > ol, main > h1, main > h2, main > h3, main > h4,
main > dl.pages, main > blockquote, .card p, main li > p {
  max-width: var(--measure);
}

h1, h2, h3, h4 { line-height: 1.25; margin: 2rem 0 0.75rem; }
h1 { font-size: 1.85rem; margin-top: 0.75rem; }
h2 { font-size: 1.4rem; padding-top: 0.5rem; border-top: 1px solid var(--border); }
h3 { font-size: 1.15rem; }
h1 code, h2 code, h3 code { font-size: 0.9em; }

p, ul, ol, dl { margin: 0 0 1rem; }
li { margin: 0.25rem 0; }
li > ul, li > ol { margin: 0.25rem 0; }

.lead { font-size: 1.15rem; color: var(--fg); }
.muted { color: var(--muted); }
.nowrap { white-space: nowrap; }

code, pre, kbd, samp { font-family: var(--mono); }
code {
  font-size: 0.9em;
  padding: 0.08em 0.3em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
}
a code { color: inherit; }

.code-wrap {
  margin: 0 0 1rem;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.code-wrap pre { margin: 0; padding: 0.75rem 1rem; }
.code-wrap code, .screen-text { padding: 0; border: 0; background: none; font-size: 0.875rem; }

/* Tables scroll inside their own frame. A shadow at the left or the right
   edge shows that more columns are out of view. The shadow moves with the
   scroll position and needs no script. */
.table-wrap {
  /* A positioned frame also clips the absolute .visually-hidden text in a
     cell. Without it, that text can make the page wider than the screen. */
  position: relative;
  margin: 0 0 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background:
    linear-gradient(to right, var(--bg) 40%, transparent) left / 2.5rem 100% no-repeat local,
    linear-gradient(to left, var(--bg) 40%, transparent) right / 2.5rem 100% no-repeat local,
    radial-gradient(farthest-side at 0 50%, var(--scroll-shadow), transparent) left / 0.85rem 100% no-repeat scroll,
    radial-gradient(farthest-side at 100% 50%, var(--scroll-shadow), transparent) right / 0.85rem 100% no-repeat scroll,
    var(--bg);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  line-height: 1.45;
}
caption {
  caption-side: top;
  text-align: left;
  padding: 0.6rem 0.75rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
th, td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
  min-width: 6ch;
}
thead th { background: var(--surface); font-weight: 700; white-space: nowrap; }
tbody th { font-weight: 600; }
tbody tr:last-child > * { border-bottom: 0; }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }
.facts-table tbody th { min-width: 18ch; }

/* Definition lists */

dl.summary, dl.fields { display: grid; gap: 0; border: 1px solid var(--border); border-radius: 6px; max-width: 60rem; }
dl.summary > div, dl.fields > div {
  display: grid;
  grid-template-columns: minmax(8rem, 14rem) 1fr;
  gap: 0.25rem 1rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}
dl.summary > div:last-child, dl.fields > div:last-child { border-bottom: 0; }
dt { font-weight: 700; }
dd { margin: 0; min-width: 0; }
dd > p:last-child, dd > ul:last-child { margin-bottom: 0; }
dd ul { padding-left: 1.2rem; margin: 0; }
ul.inline { padding-left: 1.2rem; }

@media (max-width: 36em) {
  dl.summary > div, dl.fields > div { grid-template-columns: 1fr; }
}

dl.pages > div { margin-bottom: 0.75rem; }
dl.pages dt a { font-size: 1.05rem; }

.badge {
  display: inline-block;
  padding: 0 0.4rem;
  border: 1px solid currentColor;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--badge-fg);
  font-size: 0.85em;
  font-weight: 700;
}

/* The cards on the home page */

.cards {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}
.card {
  margin: 0;
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.card h3 { margin-top: 0; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.fact-list { padding-left: 1.1rem; }

.doc-list { list-style: none; padding: 0; }
.doc-list > li { margin: 0 0 1rem; }
.doc-list > li > a { font-size: 1.1rem; font-weight: 600; }
.doc-list > li > p { margin: 0.25rem 0 0; }

.toc { padding-left: 1.2rem; }

/* A screen keeps every space and does not wrap. */
.screen { margin: 1.25rem 0; }
.screen figcaption { margin-bottom: 0.5rem; font-weight: 600; max-width: var(--measure); }
.screen-scroll {
  overflow-x: auto;
  background: var(--screen-bg);
  color: var(--screen-fg);
  border: 2px solid var(--screen-border);
  border-radius: 8px;
}
.screen-text {
  display: block;
  margin: 0;
  padding: 0.75rem 1rem !important;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
  tab-size: 8;
  line-height: 1.25;
  width: max-content;
  min-width: calc(var(--cols, 80) * 1ch + 2rem);
  font-variant-ligatures: none;
}

.actions { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }
.actions a { display: inline-block; padding: 0.6rem 0; }

.screen-list { padding-left: 1.2rem; }
.screen-list .meta { color: var(--muted); font-size: 0.9em; }

/* Breadcrumbs and pagers */

.crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}
.crumbs li { margin: 0; display: flex; align-items: center; }
.crumbs li + li::before { content: "/"; padding: 0 0.5rem; color: var(--muted); }
.crumbs a { display: inline-flex; align-items: center; min-height: 32px; }
.crumbs [aria-current] { color: var(--muted); }

.pager { margin-top: 2.5rem; border-top: 1px solid var(--border); padding-top: 1rem; }
.pager ul { list-style: none; padding: 0; display: grid; gap: 0.75rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
.pager li { margin: 0; }
.pager a {
  display: block;
  height: 100%;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  text-decoration: none;
}
.pager a:hover { text-decoration: underline; }
.pager .next { text-align: right; }
.pager-dir { display: block; font-size: 0.85rem; color: var(--muted); }

/* The filter box of the facts table. JavaScript shows it. */
.filter { margin: 0 0 1rem; max-width: 36rem; }
.filter label { display: block; font-weight: 600; margin-bottom: 0.25rem; }
.filter input {
  width: 100%;
  min-height: 44px;
  padding: 0.4rem 0.6rem;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
}
.filter-status { margin: 0.35rem 0 0; min-height: 1.6em; color: var(--muted); font-size: 0.95rem; }

/* When the browser runs scripts, show the filter box from the first paint,
   so that the table does not move down when filter.js starts. */
@media (scripting: enabled) {
  .filter[hidden] { display: block; }
}

/* Footer */

.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.footer-inner { max-width: 72rem; margin: 0 auto; padding: 1rem; font-size: 0.95rem; }
.footer-inner p { max-width: var(--measure); margin: 0.25rem 0; }

blockquote { margin: 0 0 1rem; padding: 0.25rem 1rem; border-left: 4px solid var(--border-strong); }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Print: no navigation and no controls, and no content cut at the edge of
   a scroll frame. */
@media print {
  :root {
    --bg: #ffffff;
    --fg: #000000;
    --muted: #333333;
    --surface: #ffffff;
    --link: #000000;
    --screen-bg: #ffffff;
    --screen-fg: #000000;
  }
  body { font-size: 11pt; }
  .skip-link, .site-nav, .crumbs, .filter, .pager, .actions { display: none; }
  .site-header, .site-footer { background: none; }
  main { max-width: none; padding: 0; }
  .table-wrap, .code-wrap, .screen-scroll { overflow: visible; background: none; }
  .code-wrap pre { white-space: pre-wrap; }
  .screen-text { width: auto; min-width: 0; font-size: 7.5pt; }
  h2, h3 { break-after: avoid; }
  tr, figure, .card { break-inside: avoid; }
}

.page-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-size: 0.9rem;
}
.page-actions a,
.page-actions button {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--link);
  font: inherit;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
}
.page-actions a:hover,
.page-actions button:hover { color: var(--link-hover); border-color: var(--link-hover); }
.page-actions button[hidden] { display: none; }
.copy-md-status { color: var(--muted); }
@media print { .page-actions { display: none; } }