/* Celbridge brand layer for the Zensical/Material theme.
 *
 * TDD v01 §9.1: every colour in the site derives from this file. The palette is
 * taken from the logo (docs/images/brand/logo-mark.svg) — the green ramp #31c923 → #006523,
 * the cream #efe0d8, and the slate #272832 / #494c60.
 *
 * Fonts are self-hosted (§16). `theme.font = false` in zensical.toml disables the
 * Google Fonts link the theme would otherwise emit.
 */

/* ---------------------------------------------------------------- fonts -- */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("fonts/InterVariable.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/JetBrainsMono-Regular.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/JetBrainsMono-Medium.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/JetBrainsMono-Bold.woff2") format("woff2");
}

:root {
  --md-text-font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --md-code-font: "JetBrains Mono", ui-monospace, "SF Mono", monospace;
}

/* --------------------------------------------------------------- brand -- */

:root {
  /* Green ramp, sampled from the logo mark's gradient. */
  --cb-green-100: #d8f5d3;
  --cb-green-300: #6fe063;
  --cb-green-400: #31c923;
  --cb-green-500: #29c023;
  --cb-green-600: #0b9f23;
  --cb-green-700: #007923;
  --cb-green-800: #006523;

  /* Slate ramp, from the logo's dark plate. */
  --cb-slate-900: #14161c;
  --cb-slate-800: #1b1e26;
  --cb-slate-700: #232631;
  --cb-slate-600: #272832;
  --cb-slate-500: #33364a;
  --cb-slate-400: #494c60;

  --cb-cream: #efe0d8;
  --cb-cream-dim: #bdb5ac;

  --cb-radius: 10px;
  --cb-maxw: 1200px;
}

/* -------------------------------------------------------- light scheme -- */

[data-md-color-scheme="default"] {
  --md-primary-fg-color: var(--cb-slate-600);
  --md-primary-fg-color--light: var(--cb-slate-400);
  --md-primary-fg-color--dark: var(--cb-slate-900);
  --md-primary-bg-color: #ffffff;
  --md-primary-bg-color--light: rgb(255 255 255 / 70%);

  /* #007923 on white is 5.6:1 — the logo green itself is only 1.9:1 and fails
     as link text, so the ramp is stepped down here (§9.1 step 3). */
  --md-accent-fg-color: var(--cb-green-700);
  --md-accent-fg-color--transparent: rgb(0 121 35 / 10%);
  --md-typeset-a-color: var(--cb-green-800);

  --md-footer-bg-color: var(--cb-slate-900);
  --md-footer-bg-color--dark: #0d0f14;
}

/* --------------------------------------------------------- dark scheme -- */

[data-md-color-scheme="slate"] {
  --md-hue: 232;

  --md-default-bg-color: var(--cb-slate-900);
  --md-default-bg-color--light: var(--cb-slate-800);
  --md-default-fg-color: var(--cb-cream);
  --md-default-fg-color--light: var(--cb-cream-dim);
  --md-default-fg-color--lighter: rgb(189 181 172 / 55%);
  --md-default-fg-color--lightest: rgb(189 181 172 / 18%);

  --md-primary-fg-color: var(--cb-slate-800);
  --md-primary-fg-color--light: var(--cb-slate-600);
  --md-primary-fg-color--dark: var(--cb-slate-900);
  --md-primary-bg-color: var(--cb-cream);
  --md-primary-bg-color--light: var(--cb-cream-dim);

  /* #31c923 on #14161c is 8.3:1. */
  --md-accent-fg-color: var(--cb-green-400);
  --md-accent-fg-color--transparent: rgb(49 201 35 / 12%);
  --md-typeset-a-color: var(--cb-green-300);

  --md-code-bg-color: var(--cb-slate-700);
  --md-code-fg-color: var(--cb-cream);

  --md-footer-bg-color: #0b0d11;
  --md-footer-bg-color--dark: #090a0e;
}

/* ------------------------------------------------------------ elements -- */

.md-typeset h1,
.md-typeset h2 {
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* The slate palette ships `[data-md-color-scheme=slate] h1,h2,...{color:#fff}`,
   which outranks a plain class selector and would quietly defeat the token above
   on every heading. Matching its specificity puts the token back in charge — the
   §9.1 property that a rebrand is a one-file edit only holds if nothing else gets
   to set a colour. */
[data-md-color-scheme="slate"] h1,
[data-md-color-scheme="slate"] h2,
[data-md-color-scheme="slate"] h3,
[data-md-color-scheme="slate"] h4,
[data-md-color-scheme="slate"] h5,
[data-md-color-scheme="slate"] h6 {
  color: var(--md-default-fg-color);
}

.md-header {
  border-bottom: 1px solid rgb(255 255 255 / 8%);
}

/* The GitHub logo in the header's right-hand slot
   (overrides/partials/source.html). The theme sizes that slot for a repository
   name; the icon needs only its own width. */
.md-header__source {
  max-width: none;
  width: auto;
}

.cb-header-links {
  align-items: center;
  display: flex;
  gap: 0.2rem;
}

.cb-header-links__link {
  border-radius: 0.2rem;
  color: inherit;
  opacity: 0.8;
  padding: 0.4rem;
  transition: opacity 120ms ease;
}

.cb-header-links__link:hover,
.cb-header-links__link:focus-visible {
  opacity: 1;
}

/* Both selectors are needed. The theme only styles `.md-button--primary` inside
   `.md-typeset`, so a button in a hero — which is outside the article — renders
   with no background at all unless the unscoped rule exists. */
.md-button--primary,
.md-typeset .md-button--primary {
  background-color: var(--md-accent-fg-color);
  border-color: var(--md-accent-fg-color);
  color: var(--cb-slate-900);
  font-weight: 600;
}

.md-button--primary:hover,
.md-typeset .md-button--primary:hover {
  background-color: var(--cb-green-300);
  border-color: var(--cb-green-300);
  color: var(--cb-slate-900);
}

.md-button {
  border: 1px solid currentcolor;
  border-radius: var(--cb-radius);
  cursor: pointer;
  display: inline-block;
  font-weight: 600;
  padding: 0.625em 1.25em;
  transition: background-color 120ms ease, color 120ms ease, border-color 120ms ease;
}

.md-button:not(.md-button--primary):hover {
  border-color: var(--md-accent-fg-color);
  color: var(--md-accent-fg-color);
}

/* Off-site links appended to the primary nav (overrides/partials/nav.html) get
   a rule above them, separating them from the documentation pages. */
.cb-nav__item--extra {
  border-top: 0.05rem solid var(--md-default-fg-color--lightest);
  margin-top: 0.4rem;
  padding-top: 0.4rem;
}

/* External-link indicator. Drawn in CSS so it costs no request. */
.cb-external::after {
  content: "\2197";
  font-size: 0.85em;
  margin-inline-start: 0.35em;
}

/* Screenshots in the docs are UI captures; a border keeps them from bleeding
   into the page background in either scheme. */
.md-typeset img {
  border-radius: 6px;
}

/* Visible focus ring — the theme default is easy to lose on the dark plate. */
:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}