/* Shamba site v2, base layer. Owned by the global agent only.
   Rules of this build, non negotiable:
   1. Colours, sizes, and spaces come from tokens.css. A raw hex or a px value
      that is not a token is a defect.
   2. No border-radius above 0, no shadow, no blur, no glow, no font smoothing
      property in any vendor spelling.
   3. Source Serif 4 never below 29px. Inter never above 24px. IBM Plex Mono at
      12 or 14 only.
   4. No em or en dash characters anywhere in this build, including comments. */

/* ---------------------------------------------------------------- reset */

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-17);
  line-height: var(--leading-17);
  font-weight: var(--weight-regular);
  background: var(--color-loam);
  color: var(--color-chaff);
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, ol, ul, figure { margin: 0; }
ol, ul { padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }

/* ---------------------------------------------------------------- grounds */

.ground--loam { background: var(--color-loam); color: var(--color-chaff); }
.ground--chaff { background: var(--color-chaff); color: var(--color-loam); }
.ground--millet { background: var(--color-millet); color: var(--color-loam); }

/* ---------------------------------------------------------------- shell */

.shell {
  width: 100%;
  max-width: var(--grid-content);
  margin-inline: auto;
  padding-inline: var(--grid-margin);
}

@media (min-width: 1216px) {
  .shell { padding-inline: 0; }
}

@media (max-width: 767px) {
  .shell { padding-inline: var(--grid-margin-mobile); }
}

/* ---------------------------------------------------------------- bands */

.band { position: relative; }
.band--heavy { padding-block: var(--space-192); }
.band--medium { padding-block: var(--space-128); }
.band--light { padding-block: var(--space-64); }

@media (max-width: 767px) {
  .band--heavy { padding-block: var(--space-96); }
  .band--medium { padding-block: var(--space-96); }
  .band--light { padding-block: var(--space-48); }
}

.band__head { max-width: 736px; }

.band__title {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-42);
  line-height: var(--leading-42);
  letter-spacing: -0.01em;
}

.band__text {
  margin-top: var(--space-24);
  max-width: var(--measure);
  color: var(--color-fallow);
}

.ground--chaff .band__text,
.ground--millet .band__text { color: var(--color-ink-secondary-light); }

@media (max-width: 767px) {
  .band__title { font-size: var(--text-35); line-height: var(--leading-35); }
}

/* ---------------------------------------------------------------- type acts */

.eyebrow {
  font-family: var(--font-utility);
  font-size: var(--text-14);
  line-height: var(--leading-14);
  font-weight: var(--weight-medium);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--space-24);
}

.eyebrow--dark { color: var(--color-terrace); }
.eyebrow--light { color: var(--color-furrow); }

.kern { letter-spacing: var(--comma-kern); }
.nb { white-space: nowrap; }

/* ---------------------------------------------------------------- controls */

.control {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-17);
  line-height: var(--leading-17);
  font-weight: var(--weight-medium);
  text-decoration: none;
  border: var(--hairline) solid transparent;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--chamfer-8)), calc(100% - var(--chamfer-8)) 100%, 0 100%);
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}

.control__face {
  display: inline-block;
  padding: var(--space-16) var(--space-32);
}

.control--solid {
  background: var(--color-terrace);
  color: var(--color-loam);
}

.control--solid:hover { background: var(--color-chaff); }

.ground--chaff .control--solid,
.ground--millet .control--solid {
  background: var(--color-furrow);
  color: var(--color-chaff);
}

.ground--chaff .control--solid:hover,
.ground--millet .control--solid:hover { background: var(--color-loam); }

.control--quiet {
  background: transparent;
  color: var(--color-chaff);
  border-color: var(--color-rule-dark);
}

/* On Loam the quiet control fills with the ground, so anything drawn under
   it (the scene) is occluded inside its box and it reads as a control. */
.ground--loam .control--quiet { background: var(--color-loam); }

.control--quiet:hover { border-color: var(--color-fallow); }

.textlink {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-thickness: var(--hairline);
  text-underline-offset: 4px;
  transition: color 200ms ease;
}

.ground--loam .textlink:hover { color: var(--color-terrace); }
.ground--chaff .textlink:hover,
.ground--millet .textlink:hover { color: var(--color-furrow); }

:focus-visible {
  outline: 2px solid var(--color-terrace);
  outline-offset: 2px;
}

.ground--chaff :focus-visible,
.ground--millet :focus-visible { outline-color: var(--color-furrow); }

.skiplink {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 40;
  background: var(--color-chaff);
  color: var(--color-loam);
  padding: var(--space-8) var(--space-16);
}

.skiplink:focus-visible { left: 0; }

/* ---------------------------------------------------------------- header */

/* The header is transparent over the hero. Once anchored it takes the ground
   of the act beneath it (main.js sets is-on-loam, is-on-chaff, is-on-millet
   from each act's data-ground), so it never sits as a foreign bar over a
   light act. Ink swaps to the permitted pair for that ground. */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 30;
  background: transparent;
  color: var(--color-chaff);
  border-bottom: var(--hairline) solid transparent;
  transition: background-color 280ms ease, border-color 280ms ease, color 280ms ease;
}

.site-header.is-anchored {
  background: var(--color-loam);
  border-bottom-color: var(--color-rule-dark);
}

.site-header.is-anchored.is-on-chaff {
  background: var(--color-chaff);
  color: var(--color-loam);
  border-bottom-color: var(--color-rule-light);
}

.site-header.is-anchored.is-on-millet {
  background: var(--color-millet);
  color: var(--color-loam);
  border-bottom-color: var(--color-rule-light);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-24);
}

.site-header.is-anchored .site-header__inner { padding-block: var(--space-16); }

.identity {
  display: block;
  width: 132px;
  height: 28px;
  color: inherit;
  background: currentColor;
  -webkit-mask: url('/wordmark.svg') no-repeat center / contain;
  mask: url('/wordmark.svg') no-repeat center / contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-32);
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-32);
}

.site-nav__link {
  font-size: var(--text-14);
  line-height: var(--leading-14);
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
  color: var(--color-fallow);
  text-decoration: none;
  transition: color 200ms ease, background-color 200ms ease, border-color 200ms ease;
}

.site-nav__link:hover { color: var(--color-chaff); }

.site-nav__link--cta {
  color: var(--color-terrace);
  border: var(--hairline) solid var(--color-rule-dark);
  padding: var(--space-8) var(--space-16);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--chamfer-8)), calc(100% - var(--chamfer-8)) 100%, 0 100%);
}

.site-nav__link--cta:hover {
  color: var(--color-loam);
  background: var(--color-terrace);
  border-color: var(--color-terrace);
}

/* Light grounds: secondary ink for the links, Furrow for the signal. */
.site-header.is-anchored.is-on-chaff .site-nav__link,
.site-header.is-anchored.is-on-millet .site-nav__link { color: var(--color-ink-secondary-light); }

.site-header.is-anchored.is-on-chaff .site-nav__link:hover,
.site-header.is-anchored.is-on-millet .site-nav__link:hover { color: var(--color-loam); }

.site-header.is-anchored.is-on-chaff .site-nav__link--cta,
.site-header.is-anchored.is-on-millet .site-nav__link--cta {
  color: var(--color-furrow);
  border-color: var(--color-rule-light);
}

.site-header.is-anchored.is-on-chaff .site-nav__link--cta:hover,
.site-header.is-anchored.is-on-millet .site-nav__link--cta:hover {
  color: var(--color-chaff);
  background: var(--color-furrow);
  border-color: var(--color-furrow);
}

.site-header.is-anchored.is-on-chaff :focus-visible,
.site-header.is-anchored.is-on-millet :focus-visible { outline-color: var(--color-furrow); }

/* Under 768 the three act links stay in the document and on screen: a
   12px mono row under the wordmark, with the CTA holding the top right. */
@media (max-width: 767px) {
  .site-header__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    row-gap: var(--space-8);
    padding-block: var(--space-16);
  }

  .site-header.is-anchored .site-header__inner { padding-block: var(--space-16); }

  .identity { grid-column: 1; grid-row: 1; }

  .site-nav { display: contents; }

  .site-nav__link--cta { grid-column: 2; grid-row: 1; justify-self: end; }

  .site-nav__links {
    grid-column: 1 / -1;
    grid-row: 2;
    gap: var(--space-24);
  }

  .site-nav__links .site-nav__link {
    font-family: var(--font-utility);
    font-size: var(--text-12);
    line-height: var(--leading-12);
    letter-spacing: 0.14em;
    text-transform: uppercase;
  }

  /* Once the visitor scrolls, the header collapses to one row: wordmark and
     CTA. The act links stay at the top of the page and in the hero's second
     control, so nothing is lost and the bar stops taking a tenth of the
     screen. */
  .site-header.is-anchored .site-nav__links { display: none; }
}

/* ---------------------------------------------------------------- split */

.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  column-gap: var(--space-64);
  row-gap: var(--space-64);
}

@media (max-width: 1023px) {
  .split { grid-template-columns: minmax(0, 1fr); }
}

/* ---------------------------------------------------------------- footer */

.colophon {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  row-gap: var(--space-32);
  align-items: end;
  border-top: var(--hairline) solid var(--color-rule-dark);
  padding-top: var(--space-48);
}

.colophon__id {
  display: flex;
  align-items: center;
  gap: var(--space-16);
}

.mark {
  display: block;
  width: 32px;
  height: 32px;
  background: currentColor;
  color: var(--color-terrace);
  -webkit-mask: url('/mark.svg') no-repeat center / contain;
  mask: url('/mark.svg') no-repeat center / contain;
}

.colophon__meaning {
  font-size: var(--text-14);
  line-height: var(--leading-14);
  color: var(--color-fallow);
}

.colophon__reach {
  justify-self: end;
  font-size: var(--text-17);
}

.colophon__legal {
  grid-column: 1 / -1;
  font-family: var(--font-utility);
  font-size: var(--text-12);
  line-height: var(--leading-12);
  color: var(--color-fallow);
}

@media (max-width: 767px) {
  .colophon { grid-template-columns: minmax(0, 1fr); }
  .colophon__reach { justify-self: start; }
}

/* ---------------------------------------------------------------- reveal */

/* Reveal only runs when JavaScript is present and motion is allowed. Without
   either, everything is simply visible. */

@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 640ms cubic-bezier(0.22, 1, 0.36, 1), transform 640ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .js [data-reveal-delay="1"] { transition-delay: 90ms; }
  .js [data-reveal-delay="2"] { transition-delay: 180ms; }
  .js [data-reveal-delay="3"] { transition-delay: 270ms; }

  .js [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
  }
}