/* ---------------------------------------------------------------------------
   Design system.

   Material's defaults are a documentation theme and read as one. Three moves do
   most of the work here: a near-monochrome palette with a single warm accent, a
   header that blends into the page instead of a coloured bar, and long-form
   typography sized for dense prose rather than API reference.

   Newsreader is loaded here rather than through theme.font, which only carries
   two families. @import must stay first in the file.
   --------------------------------------------------------------------------- */

@import url("https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;1,6..72,400&display=swap");

/* ------------------------------------------------------------------ palette */

:root {
  --nj-display: "Newsreader", ui-serif, Georgia, serif;
  --nj-radius: 10px;
}

[data-md-color-scheme="default"] {
  --nj-bg: #fcfcfa;
  --nj-surface: #ffffff;
  --nj-text: #17171a;
  --nj-muted: #5c5c66;
  --nj-border: #e4e3dd;
  --nj-accent: #b45309;
  --nj-accent-soft: rgba(180, 83, 9, 0.08);

  --md-default-bg-color: var(--nj-bg);
  --md-default-fg-color: var(--nj-text);
  --md-default-fg-color--light: var(--nj-muted);
  --md-default-fg-color--lighter: #8a8a93;
  --md-typeset-color: var(--nj-text);
  --md-typeset-a-color: var(--nj-accent);

  /* Header and tabs blend into the page instead of forming a coloured band. */
  --md-primary-fg-color: var(--nj-bg);
  --md-primary-fg-color--dark: var(--nj-bg);
  --md-primary-bg-color: var(--nj-text);
  --md-primary-bg-color--light: var(--nj-muted);
  --md-accent-fg-color: var(--nj-accent);
  --md-code-bg-color: #f4f3ee;
  --md-footer-bg-color: var(--nj-bg);
  --md-footer-bg-color--dark: var(--nj-bg);
  --md-footer-fg-color: var(--nj-text);
  --md-footer-fg-color--light: var(--nj-muted);
  --md-footer-fg-color--lighter: var(--nj-muted);
}

[data-md-color-scheme="slate"] {
  --nj-bg: #121215;
  --nj-surface: #1a1a1f;
  --nj-text: #e9e8e4;
  --nj-muted: #9a99a2;
  --nj-border: #2b2b32;
  --nj-accent: #eba04a;
  --nj-accent-soft: rgba(235, 160, 74, 0.1);

  --md-default-bg-color: var(--nj-bg);
  --md-default-fg-color: var(--nj-text);
  --md-default-fg-color--light: var(--nj-muted);
  --md-default-fg-color--lighter: #6f6e77;
  --md-typeset-color: var(--nj-text);
  --md-typeset-a-color: var(--nj-accent);

  --md-primary-fg-color: var(--nj-bg);
  --md-primary-fg-color--dark: var(--nj-bg);
  --md-primary-bg-color: var(--nj-text);
  --md-primary-bg-color--light: var(--nj-muted);
  --md-accent-fg-color: var(--nj-accent);
  --md-code-bg-color: #1e1e24;
  --md-footer-bg-color: var(--nj-bg);
  --md-footer-bg-color--dark: var(--nj-bg);
  --md-footer-fg-color: var(--nj-text);
  --md-footer-fg-color--light: var(--nj-muted);
  --md-footer-fg-color--lighter: var(--nj-muted);
}

/* --------------------------------------------------------------- structure */

.md-header {
  border-bottom: 1px solid var(--nj-border);
  box-shadow: none;
}

.md-header--shadow {
  box-shadow: none;
}

.md-tabs {
  border-bottom: 1px solid var(--nj-border);
}

.md-tabs__link {
  opacity: 0.72;
  font-size: 0.74rem;
}

.md-tabs__link:hover,
.md-tabs__link--active {
  opacity: 1;
}

/* Material's search field inherits the primary colour, which is now the page background,
   so without this it renders as a flat grey slab against the header. */
.md-search__form {
  background: transparent;
  border: 1px solid var(--nj-border);
  border-radius: 999px;
  height: 1.8rem;
}

.md-search__form:hover {
  background: transparent;
  border-color: var(--nj-accent);
}

[data-md-toggle="search"]:checked ~ .md-header .md-search__form {
  border-radius: 999px;
}

.md-search__input::placeholder {
  color: var(--nj-muted);
}

.md-footer {
  border-top: 1px solid var(--nj-border);
}

.md-footer-meta {
  background: transparent;
}

/* ------------------------------------------------------------- typography */

.md-typeset {
  font-size: 0.79rem;
  line-height: 1.72;
}

.md-typeset h1 {
  font-family: var(--nj-display);
  font-weight: 400;
  font-size: 2.1rem;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--nj-text);
  margin-bottom: 1.2rem;
}

.md-typeset h2 {
  font-family: var(--nj-display);
  font-weight: 400;
  font-size: 1.45rem;
  letter-spacing: -0.005em;
  margin-top: 2.6rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--nj-border);
}

.md-typeset h3 {
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.005em;
  margin-top: 1.9rem;
}

.md-typeset h4 {
  font-weight: 600;
  font-size: 0.88rem;
}

.md-typeset a {
  text-decoration-color: var(--nj-accent-soft);
  text-underline-offset: 0.18em;
  transition: text-decoration-color 120ms;
}

.md-typeset a:hover {
  text-decoration-color: var(--nj-accent);
}

/* Tables carry a lot of this site's argument, so they get real styling. */
.md-typeset table:not([class]) {
  border: 1px solid var(--nj-border);
  border-radius: var(--nj-radius);
  font-size: 0.72rem;
  overflow: hidden;
}

.md-typeset table:not([class]) th {
  background: var(--nj-accent-soft);
  color: var(--nj-text);
  font-weight: 600;
}

.md-typeset table:not([class]) td {
  border-top: 1px solid var(--nj-border);
}

.md-typeset blockquote {
  border-left: 2px solid var(--nj-accent);
  color: var(--nj-muted);
}

/* ------------------------------------------------------------------ cards */

.md-typeset .grid.cards > ul > li,
.md-typeset .grid > .card {
  border: 1px solid var(--nj-border);
  border-radius: var(--nj-radius);
  background: var(--nj-surface);
  box-shadow: none;
  padding: 1.1rem 1.2rem;
  transition: border-color 140ms, transform 140ms;
}

.md-typeset .grid.cards > ul > li:hover {
  border-color: var(--nj-accent);
  transform: translateY(-2px);
  box-shadow: none;
}

.md-typeset .grid.cards > ul > li > hr {
  margin: 0.7rem 0;
  border-bottom: 1px solid var(--nj-border);
}

/* Thumbnails sit flush to the card edge rather than floating inside padding. */
.md-typeset .grid.cards > ul > li > p:first-child > a > img,
.md-typeset .grid.cards > ul > li > p:first-child > img {
  border-radius: 6px;
  margin: -0.2rem 0 0.4rem;
  width: 100%;
  display: block;
}

/* ------------------------------------------------------------------- hero */

.nj-hero {
  padding: 1.6rem 0 2.2rem;
  border-bottom: 1px solid var(--nj-border);
  margin-bottom: 2.2rem;
}

.nj-hero__name {
  font-family: var(--nj-display);
  font-size: clamp(2.6rem, 7vw, 4rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.02;
  margin: 0 0 1rem;
  color: var(--nj-text);
}

.nj-hero__tagline {
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--nj-muted);
  max-width: 34em;
  margin: 0 0 1.6rem;
}

.nj-hero__tagline strong {
  color: var(--nj-text);
  font-weight: 500;
}

.nj-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.nj-hero__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--nj-border);
  border-radius: 999px;
  font-size: 0.72rem;
  color: var(--nj-muted) !important;
  text-decoration: none !important;
  transition: border-color 140ms, color 140ms;
}

.nj-hero__link:hover {
  border-color: var(--nj-accent);
  color: var(--nj-accent) !important;
}

.nj-hero__link svg {
  width: 0.9rem;
  height: 0.9rem;
  fill: currentColor;
}

/* The landing page hides the sidebar and TOC, so without a measure its text would run the
   full window width. Keyed off the hero's presence rather than a body class, which would
   need a second template override to set. */
.md-content__inner:has(.nj-hero) {
  max-width: 46rem;
  margin: 0 auto;
  padding-top: 0;
}

/* The hero already draws a rule; the first heading after it must not draw a second. */
.md-content__inner:has(.nj-hero) h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

/* Material inserts an empty <h1> placeholder when a page has no top-level heading. */
.md-content__inner:has(.nj-hero) > h1:empty {
  display: none;
}

@media screen and (max-width: 44.98em) {
  .nj-hero {
    padding: 2.4rem 0 1.6rem;
  }
}