/* ============================================================================
   ARC wiki styling.

   The goal is that this reads as part of actionresearchprojects.net, while
   still behaving like a wiki — sidebar, search, contents.

   Every value below is taken from the main site's own stylesheet (see
   about.html there), so the two stay congruent:

     font            "Ubuntu", sans-serif
     body text       14.5px / 300 / line-height 1.7 / #444
     headings        500 weight, #111
     secondary text  #666
     nav links       #888, hover #222
     accent rule     3px x 15px bar, #ccc
     footer          10px / 300 / rgba(0,0,0,0.4)

   There is no dark mode, because the rest of the site has none.
   ========================================================================== */

/* Material re-declares its colour variables on `body[data-md-color-scheme]`,
   which is a closer ancestor than `:root` — so a `:root`-only override is
   silently ignored everywhere inside the page. Matching its own selector is
   what makes these stick. (Found the hard way: the footer links were coming
   out white-on-white.) */
:root,
[data-md-color-scheme="default"] {
  --arc-ink:        #111;   /* headings */
  --arc-body:       #444;   /* body copy */
  --arc-strong:     #222;   /* emphasis, hover states */
  --arc-muted:      #666;   /* secondary copy */
  --arc-quiet:      #888;   /* navigation, metadata */
  --arc-rule:       #ccc;   /* hairline accents, minor rules */
  --arc-mark:       #777;   /* the h2 accent bar - darker, so sections read */
  --arc-mark-soft:  #aaa;   /* the h3 accent bar, a step lighter than h2 */
  --arc-hairline:   #e6e6e6;
  --arc-wash:       #fafafa;

  /* Material's own tokens, remapped onto the ARC palette. */
  --md-primary-fg-color:        #ffffff;
  --md-primary-fg-color--light: #ffffff;
  --md-primary-fg-color--dark:  #ffffff;
  --md-primary-bg-color:        var(--arc-strong);
  --md-primary-bg-color--light: var(--arc-quiet);

  --md-accent-fg-color:         var(--arc-ink);
  --md-accent-fg-color--transparent: rgba(0, 0, 0, 0.06);

  --md-default-bg-color:        #ffffff;
  --md-typeset-color:           var(--arc-body);
  --md-typeset-a-color:         var(--arc-strong);

  --md-text-font-family: "Ubuntu", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Footer. Material assumes a dark footer and colours its text near-white;
     ARC's is white, so these are inverted here rather than overridden per
     selector. */
  --md-footer-bg-color:          #ffffff;
  --md-footer-bg-color--dark:    #ffffff;
  --md-footer-fg-color:          rgba(0, 0, 0, 0.7);
  --md-footer-fg-color--light:   rgba(0, 0, 0, 0.45);
  --md-footer-fg-color--lighter: rgba(0, 0, 0, 0.4);
}

/* Material sizes everything from a 20px root. ARC's body copy is 14.5px, so
   scale the whole thing down rather than fighting each rule. */
html { font-size: 118%; }

body,
.md-typeset {
  font-family: var(--md-text-font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.md-typeset {
  font-size: 0.78rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--arc-body);
}

/* --- header ---------------------------------------------------------------
   White, hairline-ruled, quiet. The main site's header is a logo on white
   with grey links; this matches it. */

.md-header {
  background: #ffffff;
  color: var(--arc-strong);
  border-bottom: 1px solid var(--arc-hairline);
  box-shadow: none;
}
.md-header--shadow { box-shadow: none; }

.md-header__button.md-logo img,
.md-header__button.md-logo svg {
  height: 2rem;
  width: auto;
}
.md-header__button { color: var(--arc-quiet); }
.md-header__button:hover { color: var(--arc-strong); opacity: 1; }

.md-header__title {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--arc-quiet);
  margin-left: 0.6rem;
}
.md-header__topic:first-child { font-weight: 400; }

/* Search box: a quiet outline rather than a filled bar. */
.md-search__form {
  background: #ffffff;
  border: 1px solid var(--arc-hairline);
  border-radius: 3px;
  box-shadow: none;
}
.md-search__form:hover { background: #ffffff; border-color: var(--arc-rule); }
.md-search__input { color: var(--arc-strong); font-weight: 300; }
.md-search__input::placeholder { color: var(--arc-quiet); }
.md-search__icon { color: var(--arc-quiet); }
[data-md-toggle="search"]:checked ~ .md-header .md-search__form {
  border-color: var(--arc-rule);
}

/* --- tabs / sidebar -------------------------------------------------------- */

.md-nav {
  font-size: 0.7rem;
  font-weight: 300;
}
.md-nav__title {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--arc-muted);
  box-shadow: none;
  background: transparent;
}
/* The tier groups - Overview, Patterns, Reference - are the wiki's structure,
   so they get more weight than the pages listed beneath them. */
.md-nav__item--section > .md-nav__link,
.md-nav__item--section > label > .md-nav__link {
  color: var(--arc-ink);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  margin-top: 0.7rem;
}
.md-nav__item--section .md-nav__list { border-left: 1px solid var(--arc-hairline); }
.md-nav__item--section .md-nav__list .md-nav__link { padding-left: 0.6rem; }
.md-nav__link--active { border-left: 2px solid var(--arc-mark); margin-left: -1px; }
.md-nav__item--section .md-nav__list .md-nav__link--active { padding-left: 0.55rem; }
.md-nav__link {
  color: var(--arc-quiet);
  transition: color 0.2s;
}
.md-nav__link:hover,
.md-nav__link:focus { color: var(--arc-strong); }
.md-nav__link--active,
.md-nav__item .md-nav__link--active {
  color: var(--arc-ink);
  font-weight: 400;
}
.md-sidebar { padding-top: 1.2rem; }
.md-sidebar--secondary .md-nav__title { font-size: 0.6rem; }

/* --- typography -----------------------------------------------------------
   ARC's heading scale, with the steps between levels widened a little so the
   hierarchy reads at a glance - a wiki is skimmed, not read start to finish.
   The accent bar darkens as the level rises: #777 for h2, #aaa for h3. */

.md-typeset h1 {
  font-size: 1.62rem;
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: -0.5px;
  color: #000;
  margin: 0 0 0.5rem;
}

.md-typeset h2 {
  font-size: 1.06rem;
  font-weight: 500;
  letter-spacing: 0.1px;
  color: var(--arc-ink);
  margin: 2.6rem 0 0.75rem;
  padding: 0 0 0.4rem;
  border: 0;
  border-bottom: 1px solid var(--arc-hairline);
}
.md-typeset h2::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 16px;
  background: var(--arc-mark);
  border-radius: 2px;
  margin-right: 11px;
  vertical-align: middle;
  position: relative;
  top: -1px;
}

.md-typeset h3 {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--arc-ink);
  margin: 1.9rem 0 0.45rem;
}
.md-typeset h3::before {
  content: "";
  display: inline-block;
  width: 2px;
  height: 12px;
  background: var(--arc-mark-soft);
  border-radius: 1px;
  margin-right: 9px;
  vertical-align: middle;
  position: relative;
  top: -1px;
}

.md-typeset h4 {
  font-size: 0.79rem;
  font-weight: 500;
  color: var(--arc-strong);
  margin: 1.4rem 0 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.md-typeset p { margin: 0 0 0.9rem; }
.md-typeset strong { font-weight: 500; color: var(--arc-ink); }
.md-typeset em { font-style: italic; }

.md-typeset a {
  color: var(--arc-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--arc-mark-soft);
  transition: border-color 0.2s, color 0.2s;
}
.md-typeset a:hover {
  color: #000;
  border-bottom-color: var(--arc-strong);
}
.md-typeset a.headerlink { border: 0; }

.md-typeset ul, .md-typeset ol { margin-bottom: 0.9rem; }
.md-typeset li { margin-bottom: 0.25rem; }
.md-typeset ul li::marker { color: var(--arc-mark-soft); }

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

.md-typeset table:not([class]) {
  font-size: 0.72rem;
  font-weight: 300;
  border: 0;
  border-top: 1px solid var(--arc-hairline);
  box-shadow: none;
}
.md-typeset table:not([class]) th {
  background: transparent;
  color: var(--arc-ink);
  font-weight: 500;
  border-bottom: 2px solid var(--arc-mark);
}
.md-typeset table:not([class]) td {
  border-bottom: 1px solid var(--arc-hairline);
}

/* --- admonitions ----------------------------------------------------------
   Flat, with a single rule on the left, in keeping with ARC's h2 accent.
   Material colours each type (blue for note, orange for warning and so on);
   the ARC site is near-monochrome, so those are overridden here. */

.md-typeset .admonition,
.md-typeset details {
  font-size: 0.74rem;
  font-weight: 300;
  border: 0;
  border-left: 3px solid var(--arc-mark-soft);
  border-radius: 0;
  box-shadow: none;
  background: var(--arc-wash);
  padding: 0.35rem 0.9rem 0.55rem;
}

/* Every admonition type, monochrome. */
.md-typeset .admonition.note,
.md-typeset .admonition.info,
.md-typeset .admonition.tip,
.md-typeset .admonition.abstract,
.md-typeset .admonition.example,
.md-typeset .admonition.quote,
.md-typeset details.note,
.md-typeset details.tip {
  border-left-color: var(--arc-mark-soft);
}

/* Anything cautionary gets a darker rule, so it still reads as a warning
   without introducing a colour the rest of the site never uses. */
.md-typeset .admonition.warning,
.md-typeset .admonition.danger,
.md-typeset .admonition.caution,
.md-typeset .admonition.failure,
.md-typeset .admonition.bug,
.md-typeset details.warning,
.md-typeset details.danger {
  border-left-color: var(--arc-ink);
}

.md-typeset .admonition-title,
.md-typeset summary {
  background: transparent !important;
  background-color: transparent !important;
  font-weight: 500;
  font-size: 0.74rem;
  color: var(--arc-ink);
  padding: 0.35rem 0 0.15rem 0;
  margin: 0;
  border: 0;
}

/* Material reserves 2rem on the left for a coloured icon, in a rule qualified
   by [dir=ltr] - which outranks a plain selector, so this has to match it. */
[dir="ltr"] .md-typeset .admonition-title,
[dir="ltr"] .md-typeset summary,
[dir="rtl"] .md-typeset .admonition-title,
[dir="rtl"] .md-typeset summary {
  padding-left: 0;
  padding-right: 0;
}

/* Also removes the negative side margins Material uses to bleed the title bar
   to the edges; there is no bar here. */
.md-typeset .admonition-title,
.md-typeset summary { margin: 0; }

/* The icon itself. */
.md-typeset .admonition-title::before,
.md-typeset summary::before,
.md-typeset .admonition-title::after,
.md-typeset summary::after {
  display: none;
  content: none;
}

.md-typeset .admonition > :last-child,
.md-typeset details > :last-child { margin-bottom: 0.35rem; }

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

.md-typeset code {
  background: var(--arc-wash);
  border: 1px solid var(--arc-hairline);
  border-radius: 2px;
  padding: 0.05em 0.35em;
  font-size: 0.86em;
  color: var(--arc-strong);
}
.md-typeset pre > code { border: 0; }

/* --- the draft banner ------------------------------------------------------ */

.arc-banner {
  border-left: 3px solid var(--arc-rule);
  background: var(--arc-wash);
  padding: 0.7rem 0.9rem;
  margin: 0 0 1.6rem;
  border-radius: 0;
  font-size: 0.7rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--arc-muted);
}
.arc-banner strong { color: var(--arc-strong); font-weight: 500; }

/* --- footer ---------------------------------------------------------------
   ARC's own footer treatment: very small, very quiet. */

.md-footer { background: #ffffff; border-top: 1px solid var(--arc-hairline); }
.md-footer-meta { background: #ffffff; }
.md-footer-meta__inner { padding: 0.6rem 0.8rem; }
.md-copyright,
.md-copyright__highlight {
  font-size: 10px;
  font-weight: 300;
  color: rgba(0, 0, 0, 0.4);
}
.md-footer__link { color: var(--arc-quiet); }
.md-footer__title { font-weight: 400; }
.md-footer-nav__title { font-weight: 400; }

.arc-site-link {
  font-size: 10px;
  font-weight: 300;
  color: rgba(0, 0, 0, 0.4);
  text-decoration: none;
}
.arc-site-link:hover { color: rgba(0, 0, 0, 0.6); }

/* ============================================================================
   Chat page
   ========================================================================== */

.arc-chat { max-width: 46rem; }

.arc-chat__log {
  min-height: 8rem;
  margin: 1.2rem 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.arc-chat__turn {
  padding: 0.75rem 0.95rem;
  border-radius: 3px;
  line-height: 1.7;
  font-size: 0.76rem;
  font-weight: 300;
}
.arc-chat__turn--you {
  background: var(--arc-wash);
  align-self: flex-end;
  max-width: 85%;
  color: var(--arc-strong);
}
.arc-chat__turn--arc {
  background: transparent;
  border-left: 3px solid var(--arc-rule);
  padding-left: 0.9rem;
}
.arc-chat__turn--error { border-left-color: #c0392b; color: #c0392b; }

.arc-chat__who {
  display: block;
  font-size: 0.58rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--arc-quiet);
  margin-bottom: 0.4rem;
  font-weight: 400;
}

.arc-chat__form { display: flex; gap: 0.5rem; align-items: flex-start; }
.arc-chat__input {
  flex: 1;
  padding: 0.6rem 0.7rem;
  font: 300 0.78rem/1.6 var(--md-text-font-family);
  border: 1px solid var(--arc-hairline);
  border-radius: 3px;
  background: #ffffff;
  color: var(--arc-strong);
  resize: vertical;
  min-height: 3rem;
}
.arc-chat__input:focus { outline: none; border-color: var(--arc-rule); }
.arc-chat__send {
  padding: 0.6rem 1.2rem;
  font: 400 0.74rem var(--md-text-font-family);
  cursor: pointer;
  border: 1px solid var(--arc-ink);
  border-radius: 3px;
  background: var(--arc-ink);
  color: #ffffff;
  transition: opacity 0.2s;
}
.arc-chat__send:hover { opacity: 0.85; }
.arc-chat__send[disabled] { opacity: 0.35; cursor: default; }

.arc-chat__count {
  font-size: 0.62rem;
  font-weight: 300;
  color: var(--arc-quiet);
  margin-top: 0.4rem;
}
.arc-chat__count--over { color: #c0392b; }

/* Citations: small, numbered, clickable. */
.arc-cite {
  display: inline-block;
  font-size: 0.68em;
  font-weight: 500;
  line-height: 1;
  padding: 0.2em 0.45em;
  margin: 0 0.15em;
  border-radius: 2px;
  background: var(--arc-ink);
  color: #ffffff;
  text-decoration: none;
  border: 0;
  vertical-align: 0.3em;
}
.arc-cite:hover { background: var(--arc-strong); color: #ffffff; border: 0; }

.arc-chat__sources {
  margin-top: 0.9rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--arc-hairline);
  font-size: 0.68rem;
  color: var(--arc-muted);
}
.arc-chat__sources ol { margin: 0.35rem 0 0 1.1rem; padding: 0; }
.arc-chat__sources button {
  font: 300 0.66rem var(--md-text-font-family);
  border: 1px solid var(--arc-hairline);
  background: #ffffff;
  color: var(--arc-muted);
  border-radius: 2px;
  padding: 0.15rem 0.55rem;
  cursor: pointer;
  margin-left: 0.2rem;
}
.arc-chat__sources button:hover { color: var(--arc-strong); border-color: var(--arc-rule); }

.arc-chat__cursor::after {
  content: "▍";
  animation: arc-blink 1s steps(2) infinite;
}
@keyframes arc-blink { 50% { opacity: 0; } }

/* --- small screens --------------------------------------------------------- */

@media screen and (max-width: 76.1875em) {
  .md-nav--primary .md-nav__title { background: #ffffff; color: var(--arc-ink); }
  .md-nav--primary .md-nav__title ~ .md-nav__list { box-shadow: none; }
}

/* Provenance lines under a page title: present, but quiet. */
.md-typeset .arc-meta {
  font-size: 0.66rem;
  font-weight: 300;
  color: var(--arc-quiet);
  margin: 0 0 0.5rem;
}
.md-typeset .arc-meta code {
  font-size: 0.9em;
  background: transparent;
  border: 0;
  padding: 0;
  color: var(--arc-muted);
}

/* ---------------------------------------------------------------------------
   Two fixes worth spelling out.
   ------------------------------------------------------------------------ */

/* 1. `display: flex` on a class beats the browser's own [hidden] rule, so
      el.hidden = true silently does nothing. This restores it. It is why the
      chat form stayed on screen when the API was unreachable. */
[hidden] { display: none !important; }

/* 2. Material's footer is normally dark, so its link colour is near-white.
      Fighting that with selectors loses: `.md-footer-meta.md-typeset a` is more
      specific than anything sensible. Redefine the variables instead — see the
      footer block in :root below. */

/* The provenance block at the foot of each page: present, easy to ignore. */
.md-typeset small {
  display: block;
  font-size: 0.66rem;
  font-weight: 300;
  line-height: 1.75;
  color: var(--arc-quiet);
}
.md-typeset small strong { color: var(--arc-muted); font-weight: 500; }
.md-typeset small code {
  background: transparent;
  border: 0;
  padding: 0;
  color: var(--arc-muted);
}
.md-typeset small a { border-bottom-color: var(--arc-rule); }

/* Shown while a sleeping free-tier service wakes up, so a minute of silence
   does not read as a broken page. */
.arc-chat__waking {
  color: var(--arc-quiet);
  font-style: italic;
  margin: 0;
}