/* ==========================================================================
   Engineering the AI-Native Cloud - theme
   Palette lifted from the talk's hero-slide artwork:
     - Deep indigo/navy night skies  -> dark mode background
     - Warm gold leaf detailing      -> accent (borders, buttons, icons only)
     - Imperial purple (closing card)-> secondary accent
   Hard accessibility rule: body copy, headings and links are ALWAYS pure
   black (#000000) on light backgrounds or pure white (#ffffff) on dark
   backgrounds. Grey is never used for text -- only for hairline borders
   on large decorative surfaces where no text sits.
   ========================================================================== */

:root {
  --anc-gold: #c9a227;
  --anc-gold-strong: #a9841a;
  --anc-purple: #4b3f8a;
  --anc-navy: #0b0f1e;
  --anc-navy-2: #131a30;
}

/* ---------- Dark scheme (default; matches the slide artwork) ------------ */
[data-md-color-scheme="anc-dark"] {
  --md-default-bg-color: var(--anc-navy);
  --md-default-fg-color: #ffffff;
  --md-default-fg-color--light: #ffffff;
  --md-default-fg-color--lighter: #ffffff;
  --md-default-fg-color--lightest: #ffffff;

  --md-primary-fg-color: var(--anc-navy-2);
  --md-primary-fg-color--light: var(--anc-navy-2);
  --md-primary-fg-color--dark: var(--anc-navy);
  --md-primary-bg-color: #ffffff;
  --md-primary-bg-color--light: #ffffff;

  --md-accent-fg-color: var(--anc-gold);
  --md-accent-fg-color--transparent: rgba(201, 162, 39, 0.15);
  --md-accent-bg-color: #000000;

  --md-typeset-color: #ffffff;
  --md-typeset-a-color: #ffffff;

  --md-code-bg-color: #171f38;
  --md-code-fg-color: #ffffff;

  --md-footer-bg-color: var(--anc-navy-2);
  --md-footer-bg-color--dark: var(--anc-navy);
  --md-footer-fg-color: #ffffff;
  --md-footer-fg-color--light: #ffffff;

  color-scheme: dark;
}

/* ---------- Light scheme -------------------------------------------------*/
[data-md-color-scheme="anc-light"] {
  --md-default-bg-color: #ffffff;
  --md-default-fg-color: #000000;
  --md-default-fg-color--light: #000000;
  --md-default-fg-color--lighter: #000000;
  --md-default-fg-color--lightest: #000000;

  --md-primary-fg-color: #ffffff;
  --md-primary-fg-color--light: #ffffff;
  --md-primary-fg-color--dark: #ffffff;
  --md-primary-bg-color: #000000;
  --md-primary-bg-color--light: #000000;

  --md-accent-fg-color: var(--anc-gold-strong);
  --md-accent-fg-color--transparent: rgba(169, 132, 26, 0.12);
  --md-accent-bg-color: #ffffff;

  --md-typeset-color: #000000;
  --md-typeset-a-color: #000000;

  --md-code-bg-color: #f2f0e6;
  --md-code-fg-color: #000000;

  --md-footer-bg-color: #000000;
  --md-footer-bg-color--dark: #000000;
  --md-footer-fg-color: #ffffff;
  --md-footer-fg-color--light: #ffffff;

  color-scheme: light;
}

/* ---------- Global overrides: no grey text, anywhere --------------------- */
.md-typeset,
.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4,
.md-typeset h5,
.md-typeset h6,
.md-typeset p,
.md-typeset li,
.md-typeset td,
.md-typeset th,
.md-nav__link,
.md-nav__title,
.md-tabs__link,
.md-footer-meta,
.md-footer__link,
.md-header__topic {
  color: var(--md-default-fg-color) !important;
}

.md-typeset a,
.md-typeset a:visited {
  color: var(--md-default-fg-color);
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
  font-weight: 600;
}

.md-typeset a:hover,
.md-typeset a:focus {
  color: var(--md-default-fg-color);
  text-decoration-color: var(--md-accent-fg-color);
  text-decoration-thickness: 0.16em;
}

/* Strong, visible focus ring everywhere (keyboard accessibility) */
:focus-visible {
  outline: 3px solid var(--anc-gold) !important;
  outline-offset: 2px;
}

/* Header / nav bar keeps brand ink, never grey */
.md-header {
  border-bottom: 1px solid var(--anc-gold);
}

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

[data-md-color-scheme="anc-dark"] .md-header,
[data-md-color-scheme="anc-dark"] .md-tabs,
[data-md-color-scheme="anc-dark"] .md-footer {
  background-color: var(--anc-navy-2);
}

[data-md-color-scheme="anc-light"] .md-header,
[data-md-color-scheme="anc-light"] .md-tabs {
  background-color: #000000;
}

/* Search box + inputs keep readable ink */
.md-search__input {
  color: var(--md-default-fg-color) !important;
}

/* ---------- Skip-to-content link (built into Material's base.html) ------ */
.md-skip {
  background: var(--anc-gold) !important;
  color: #000000 !important;
  font-weight: 700;
}
.md-skip:focus {
  outline: 3px solid #000000;
  outline-offset: 2px;
}

/* ---------- Hero banner (top of every chapter page) ----------------------*/
.hero-banner {
  position: relative;
  margin: -1.2rem -1.2rem 1.6rem -1.2rem;
  border-radius: 0.15rem;
  overflow: hidden;
  border: 1px solid var(--anc-gold);
}
.hero-banner img {
  display: block;
  width: 100%;
  height: auto;
}
.hero-banner__caption {
  padding: 0.6rem 1rem;
  background: var(--anc-navy-2);
  color: #ffffff !important;
  font-size: 0.85rem;
  font-weight: 600;
  border-top: 1px solid var(--anc-gold);
}
[data-md-color-scheme="anc-light"] .hero-banner__caption {
  background: #000000;
  color: #ffffff !important;
}

@media screen and (min-width: 76.25em) {
  .hero-banner {
    margin: -1.2rem -1.6rem 1.6rem -1.6rem;
  }
}

/* ---------- Chapter meta strip (time / theme tags) ------------------------*/
.chapter-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}
.chapter-meta__tag {
  border: 1px solid var(--anc-gold);
  color: var(--md-default-fg-color);
  background: transparent;
  border-radius: 999px;
  padding: 0.2rem 0.85rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ---------- Homepage hero + thumbnail grid --------------------------------*/
.home-hero {
  position: relative;
  margin: -1.2rem -1.2rem 2rem -1.2rem;
  border-radius: 0.15rem;
  overflow: hidden;
  border: 1px solid var(--anc-gold);
}
.home-hero img {
  display: block;
  width: 100%;
  height: auto;
}
@media screen and (min-width: 76.25em) {
  .home-hero {
    margin: -1.2rem -1.6rem 2rem -1.6rem;
  }
}

.md-typeset ul.chapter-grid:not([hidden]) {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2.5rem 0;
  list-style: none;
  padding: 0;
}

.md-typeset .chapter-grid > .chapter-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  margin: 0;
  border: 1px solid var(--anc-gold);
  border-radius: 0.2rem;
  overflow: hidden;
  background: var(--md-default-bg-color);
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.chapter-card:hover,
.chapter-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}
.chapter-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--anc-gold);
}
.chapter-card__body {
  padding: 0.9rem 1rem 1.1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
}
.chapter-card__num {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--anc-gold) !important;
}
.chapter-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--md-default-fg-color) !important;
  text-decoration: underline;
  text-decoration-color: transparent;
}
.chapter-card:hover .chapter-card__title,
.chapter-card:focus-within .chapter-card__title {
  text-decoration-color: var(--anc-gold);
}
.chapter-card__desc {
  font-size: 0.9rem;
  color: var(--md-default-fg-color) !important;
  margin: 0;
}
.chapter-card__link {
  margin-top: auto;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--md-default-fg-color) !important;
}

@media screen and (max-width: 59.984375em) {
  .md-typeset ul.chapter-grid:not([hidden]) {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media screen and (max-width: 39.984375em) {
  .md-typeset ul.chapter-grid:not([hidden]) {
    grid-template-columns: 1fr;
  }
}

/* ---------- Exercise / callout styling ------------------------------------*/
.md-typeset .admonition,
.md-typeset details {
  border-color: var(--anc-gold);
}
.md-typeset .admonition-title,
.md-typeset summary {
  background-color: rgba(201, 162, 39, 0.12);
}
.md-typeset .admonition-title::before,
.md-typeset summary::before {
  background-color: var(--anc-gold) !important;
}

/* ---------- Buttons (resources page, CTA) ---------------------------------*/
.md-typeset .anc-button {
  display: inline-block;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  border: 2px solid var(--anc-gold);
  color: var(--md-default-fg-color) !important;
  font-weight: 700;
  text-decoration: none !important;
  margin: 0.25rem 0.5rem 0.25rem 0;
}
.md-typeset .anc-button:hover,
.md-typeset .anc-button:focus {
  background: var(--anc-gold);
  color: #000000 !important;
}

/* ---------- Footer prev/next: keep pure ink, gold divider ------------------*/
.md-footer-nav__link .md-footer-nav__title,
.md-footer-nav__link .md-ellipsis {
  color: #ffffff !important;
}
[data-md-color-scheme="anc-light"] .md-footer-nav__link .md-footer-nav__title,
[data-md-color-scheme="anc-light"] .md-footer-nav__link .md-ellipsis {
  color: #ffffff !important;
}