/* The look of akadian.ca (myarcadia/Mars-Home): Arcadia City under its dome, the brand's colours and fonts.
   Two schemes, chosen with the header toggle and remembered: Mars night (slate) and Mars dawn (default). */

@font-face {
  font-family: "Cormorant Garamond";
  font-style: italic;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/cormorant-garamond/CormorantGaramond-SemiBoldItalic-Latin.woff2") format("woff2");
}

:root {
  --md-text-font: "IBM Plex Sans";
  --md-code-font: "IBM Plex Mono";
  --mars-display: "Saira Condensed", "Arial Narrow", system-ui, sans-serif;
  --mars-serif: "Cormorant Garamond", Georgia, "Times New Roman", serif;
}

/* Mars night: the homepage's own colours */
[data-md-color-scheme="slate"] {
  color-scheme: dark;
  --mars-bg: #120b09;
  --mars-bg-fade: rgba(18, 11, 9, 0.5);
  --mars-bg-soft: rgba(18, 11, 9, 0.82);
  --mars-panel: #1c110e;
  --mars-rust: #eea66f;
  --mars-photo: url("../images/21-starlit-city.webp");

  --md-default-bg-color: var(--mars-bg);
  --md-default-bg-color--light: rgba(18, 11, 9, 0.7);
  --md-default-bg-color--lighter: rgba(18, 11, 9, 0.3);
  --md-default-bg-color--lightest: rgba(18, 11, 9, 0.12);
  --md-default-fg-color: #f4e6d4;
  --md-default-fg-color--light: #cdb096;
  --md-default-fg-color--lighter: rgba(244, 230, 212, 0.32);
  --md-default-fg-color--lightest: rgba(244, 230, 212, 0.16);
  --md-typeset-color: #f4e6d4;
  --md-typeset-a-color: #9cc9ea;
  --md-accent-fg-color: var(--mars-rust);
  --md-accent-fg-color--transparent: rgba(238, 166, 111, 0.12);
  --md-code-bg-color: var(--mars-panel);
  --md-code-fg-color: #f4e6d4;
  --md-typeset-table-color: rgba(244, 230, 212, 0.16);
  --md-typeset-table-color--light: rgba(244, 230, 212, 0.05);

}

/* Mars dawn: the dusty pink-tan of the morning sky over the dome */
[data-md-color-scheme="default"] {
  color-scheme: light;
  --mars-bg: #efdecb;
  --mars-bg-fade: rgba(239, 222, 203, 0.45);
  --mars-bg-soft: rgba(239, 222, 203, 0.86);
  --mars-panel: #e6cfb6;
  --mars-rust: #a9471c;
  --mars-photo: url("../images/27-dawn-after-storm.webp");

  --md-default-bg-color: var(--mars-bg);
  --md-default-fg-color: #2b1a12;
  --md-default-fg-color--light: #6b4a36;
  --md-default-fg-color--lighter: rgba(43, 26, 18, 0.34);
  --md-default-fg-color--lightest: rgba(43, 26, 18, 0.14);
  --md-typeset-color: #2b1a12;
  --md-typeset-a-color: #1f5a8c;
  --md-accent-fg-color: var(--mars-rust);
  --md-accent-fg-color--transparent: rgba(169, 71, 28, 0.1);
  --md-code-bg-color: #e8d5bf;
  --md-code-fg-color: #2b1a12;
  --md-typeset-table-color: rgba(43, 26, 18, 0.16);
  --md-typeset-table-color--light: rgba(43, 26, 18, 0.05);

}

/* both: the bar stays a dark band, like the homepage's top bar over its picture */
[data-md-color-scheme] {
  --md-primary-fg-color: #1a100c;
  --md-primary-fg-color--light: #5b3624;
  --md-primary-fg-color--dark: #120b09;
  --md-primary-bg-color: #f4e6d4;
  --md-primary-bg-color--light: rgba(244, 230, 212, 0.7);
  --md-accent-bg-color: #1a100c;
  --md-footer-bg-color: #120b09;
  --md-footer-bg-color--dark: #0a0605;
  --md-footer-fg-color: #f4e6d4;
  --md-footer-fg-color--light: #cdb096;
  --md-footer-fg-color--lighter: rgba(244, 230, 212, 0.45);
}

.md-header {
  background: rgba(18, 11, 9, 0.82);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(244, 230, 212, 0.1);
}

.md-header__title {
  font-family: var(--mars-serif);
  font-style: italic;
  font-weight: 600;
  font-size: 1.05rem;
}

/* the site name links to this site's first page: Mars orange and underlined under the pointer (the header is dark in both schemes) */
/* hover: a solid line draws under the name and a back arrow slides in, so it reads as "go home" */
.md-header__title .home-link { color: inherit; cursor: pointer; text-decoration: none; padding-bottom: 0.1em;
  background: linear-gradient(currentColor, currentColor) left bottom / 0 2px no-repeat;
  transition: color 0.15s, background-size 0.25s; }
.md-header__title .home-link::before { content: "\2190"; display: inline-block; width: 0; opacity: 0;
  overflow: hidden; vertical-align: bottom; transition: width 0.25s, opacity 0.25s; }
.md-header__title .home-link:hover, .md-header__title .home-link:focus-visible { color: #eea66f; background-size: 100% 2px; }
.md-header__title .home-link:hover::before, .md-header__title .home-link:focus-visible::before { width: 1.2em; opacity: 1; }
@media (prefers-reduced-motion: reduce) { .md-header__title .home-link, .md-header__title .home-link::before { transition: none; } }

/* every page opens under the dome: the picture fades into the page colour */
.md-container {
  background:
    linear-gradient(180deg, var(--mars-bg-fade) 0, var(--md-default-bg-color) 24rem),
    var(--mars-photo) center top / 100% auto no-repeat,
    var(--md-default-bg-color);
}

/* the homepage: the algorithms picture full width (the shortest route between Mars sites, drawn for this site, with the
   formulas behind it; images/README.md), the title at its foot.
   The other pages keep the city picture behind their text */
.mars-hero {
  --mars-hero-photo: url("../images/cs-hero.webp");
  /* a full-width banner that never crops the picture (Jim 1 Nov 2026: "banner", "show all the contents, not trimmed",
     "fit the screen"): the whole picture sits on the right at the banner's height, a soft blurred copy of it fills
     the rest of the width, and the title sits on the left over the blur */
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: center;
  --mars-hero-h: clamp(16rem, 30vw, 27rem);
  height: var(--mars-hero-h);
  background: #07080c;
}

.mars-hero::before {
  content: "";
  position: absolute;
  inset: -2rem;
  z-index: -2;
  background: var(--mars-hero-photo) center / cover no-repeat;
  filter: blur(26px) brightness(0.5) saturate(1.1);
}

.mars-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  aspect-ratio: 16 / 9;
  background: var(--mars-hero-photo) center / contain no-repeat;
  /* the left edge melts into the blur */
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 14%);
  mask-image: linear-gradient(90deg, transparent 0, #000 14%);
}

.mars-hero__inner {
  width: 100%;
  padding: 0 0.8rem 2.2rem;
}

.mars-hero__title {
  margin: 0;
  font-family: var(--mars-serif);
  font-style: italic;
  font-weight: 600;
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  line-height: 1;
  color: #f4e6d4;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.6);
}

[data-md-color-scheme="default"] .mars-hero__title {
  color: #2b1a12;
  text-shadow: 0 1px 14px rgba(239, 222, 203, 0.7);
}

/* over the dark blur the title and lead are light in both colour schemes */
.mars-hero .mars-hero__inner { padding-top: 0; padding-bottom: 0; }
/* the text stays in the blurred strip left of the picture (picture width = height x 16/9) */
.mars-hero .mars-hero__title,
.mars-hero .mars-hero__lead { max-width: max(16rem, calc(100vw - var(--mars-hero-h) * 16 / 9 - 2.4rem)); }
.mars-hero .mars-pill { color: #f4e6d4; border-color: rgba(244, 230, 212, 0.55); background: rgba(10, 8, 6, 0.35); }
.mars-hero .mars-pill:hover { color: #fff; border-color: #eea66f; }
.mars-hero__title, [data-md-color-scheme="default"] .mars-hero__title { color: #f4e6d4; text-shadow: 0 2px 18px rgba(0, 0, 0, 0.6); }

.mars-hero__lead {
  max-width: 36rem;
  margin: 0.6rem 0 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #ecdccb;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.6);
}

.mars-hero__go {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.1rem 0 0;
}

.mars-cta,
.mars-pill {
  font-family: var(--mars-display);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  padding: 0.3rem 1rem;
  border-radius: 999px;
}

.md-typeset .mars-cta,
.mars-cta {
  color: #1a100c;
  background: #eea66f;
  box-shadow: 0 6px 24px rgba(238, 166, 111, 0.3);
}

.mars-pill {
  color: var(--md-default-fg-color);
  border: 1px solid var(--md-default-fg-color--lighter);
  background: var(--md-default-bg-color--lighter);
}

.mars-cta:hover { color: #1a100c; box-shadow: 0 8px 30px rgba(238, 166, 111, 0.5); }
.mars-pill:hover { color: var(--md-default-fg-color); border-color: var(--md-typeset-a-color); }
.mars-cta:focus-visible,
.mars-pill:focus-visible { outline: 2px solid var(--md-typeset-a-color); outline-offset: 3px; }

/* headings in the homepage's condensed face */
.md-typeset h1,
.md-typeset h2,
.md-typeset h3 {
  font-family: var(--mars-display);
  color: var(--md-default-fg-color);
  letter-spacing: 0.01em;
}

.md-typeset h1 { font-weight: 700; }
.md-typeset h2 { font-weight: 600; border-bottom: 1px solid var(--md-default-fg-color--lightest); padding-bottom: 0.2em; }

.md-typeset table:not([class]) {
  background: var(--md-default-bg-color);
}

.md-typeset table:not([class]) th {
  background: var(--mars-panel);
  font-family: var(--mars-display);
  font-weight: 600;
  letter-spacing: 0.03em;
}

/* wider page; the right-hand contents panel lives in the left one (toc.integrate) */
.md-grid {
  max-width: 80rem;
}

/* left panel: the 11 categories read as headings, the pages under them as items */
@media screen and (min-width: 76.25em) {
  .md-nav--primary > .md-nav__list > .md-nav__item--section {
    margin-top: 1em;
    padding-top: .6em;
    border-top: 1px solid var(--md-default-fg-color--lightest);
  }

  .md-nav--primary > .md-nav__list > .md-nav__item > .md-nav__link {
    color: var(--mars-rust);
    font-family: var(--mars-display);
    font-weight: 700;
    font-size: .74rem;
    letter-spacing: .04em;
  }

  .md-nav--primary > .md-nav__list > .md-nav__item--section > .md-nav > .md-nav__list {
    margin-left: .2rem;
    padding-left: .5rem;
    border-left: 2px solid var(--md-default-fg-color--lightest);
  }
}

@media screen and (max-width: 44.9375em) {
  /* on a phone: the whole picture across the width, the title on the plain page under it */
  .mars-hero { flex-direction: column; align-items: stretch; height: auto; background: var(--md-default-bg-color); }
  .mars-hero::before { display: none; }
  .mars-hero::after { order: -1; position: static; display: block; width: 100%; aspect-ratio: 16 / 9; -webkit-mask-image: none; mask-image: none; }
  .mars-hero .mars-hero__inner { padding: 1rem 0.8rem 1.6rem; }
  .mars-hero .mars-hero__title, .mars-hero .mars-hero__lead { max-width: none; }
  .mars-hero .mars-pill { color: var(--md-default-fg-color); border-color: var(--md-default-fg-color--lighter); background: var(--md-default-bg-color--lighter); }
  .mars-hero__title, [data-md-color-scheme="default"] .mars-hero__title { color: var(--md-default-fg-color); text-shadow: none; }
  .mars-hero__lead { color: var(--md-default-fg-color); text-shadow: none; }
  /* on a phone the whole picture sits above the title, so the whole drawing stays in view and the words are on the plain page */
  /* phones: the picture is only a faint tint at the top, so body text stays on the plain page colour (#3) */
  .md-container {
    background:
      linear-gradient(180deg, var(--mars-bg-soft) 0, var(--md-default-bg-color) 9rem),
      var(--mars-photo) center top / 200% auto no-repeat,
      var(--md-default-bg-color);
  }
}

/* the wordmark reads "Mars – Math", like the homepage's "Mars – your new home";
   "Mars" is the way back there (extra.homepage, overrides/partials/logo.html) */
.md-header__button.md-logo {
  display: inline-flex;
  align-items: baseline;
  margin: 0 0 0 0.2rem;
  padding: 0.4rem 0 0.4rem 0.4rem;
  font-family: var(--mars-serif);
  font-style: italic;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--md-primary-bg-color);
  opacity: 1;
}

.md-header__button.md-logo::after {
  content: "–";
  margin-left: 0.35em;
  color: #cdb096;
}

.md-logo .mars-mark {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: rgba(244, 230, 212, 0.35);
  transition: color 0.2s, text-decoration-color 0.2s;
}

.md-header__button.md-logo:hover,
.md-header__button.md-logo:focus-visible {
  opacity: 1;
}

.md-logo:hover .mars-mark,
.md-logo:focus-visible .mars-mark {
  color: #eea66f;
  text-decoration-color: currentColor;
}

.md-header__inner .md-header__title {
  margin-left: 0.35em;
}

/* the drawer on phones shows the same "Mars" link above the menu */
.md-nav__button.md-logo {
  font-family: var(--mars-serif);
  font-style: italic;
  font-weight: 600;
  font-size: 1.05rem;
}

@media screen and (max-width: 76.234375em) {
  .md-header__button[for="__drawer"] {
    order: -1;
  }
}