.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 2 * var(--gutter), var(--container-narrow));
  margin-left: max(var(--gutter), (100% - var(--container)) / 2);
  margin-right: auto;
}

.stack > * + * {
  margin-top: var(--stack-gap, var(--space-5));
}

.stack--tight {
  --stack-gap: var(--space-2);
}

.stack--roomy {
  --stack-gap: var(--space-5);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--cluster-gap, var(--space-3));
}

.section {
  padding-block: var(--space-8);
}

.on-stage {
  background: var(--color-stage);
  color: #ffffff;
}

.breadcrumb-band {
  min-height: calc(var(--text-sm) * 1.6 + 2 * var(--space-4));
  background: var(--color-paper-alt);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  padding-block: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-3);
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-primary-deep);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.prototype-ribbon {
  background: var(--color-band);
  color: #ffffff;
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.4;
}

.prototype-ribbon .container {
  padding-block: var(--space-2);
  text-align: center;
}

.prototype-ribbon strong {
  font-weight: 700;
}

.site-header {
  position: absolute;
  left: 0;
  right: 0;
  z-index: 40;
  color: #ffffff;
  background: linear-gradient(180deg, rgb(0 0 0 / 0.72) 0%, rgb(0 0 0 / 0.5) 65%, rgb(0 0 0 / 0) 100%);
  view-transition-name: site-header;
}

@supports (animation-timeline: scroll()) {
  .site-header {
    position: sticky;
    top: 0;
    margin-bottom: calc(-1 * var(--header-height));
    animation: site-header-solid linear both;
    animation-timeline: scroll(root);
    animation-range: 0 8rem;
  }
}

@keyframes site-header-solid {
  to {
    background-color: var(--color-stage);
    box-shadow: 0 1px 0 rgb(255 255 255 / 0.08);
  }
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  text-decoration: none;
  color: #ffffff;
}

.brand__logo {
  width: auto;
  height: 2.25rem;
}

.nav-toggle {
  display: inline-grid;
  place-items: center;
  width: var(--touch-target);
  height: var(--touch-target);
  background: transparent;
  border: 2px solid rgb(255 255 255 / 0.6);
  border-radius: var(--radius-control);
  color: #ffffff;
}

.nav-toggle:hover {
  border-color: #ffffff;
}

.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-stage);
  border-top: 1px solid rgb(255 255 255 / 0.12);
  border-bottom: 1px solid rgb(255 255 255 / 0.16);
  box-shadow: 0 1.5rem 2rem rgb(0 0 0 / 0.55);
}

.site-nav:not([data-open="true"]) {
  display: none;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  padding-block: var(--space-2);
}

.site-nav__link,
.site-nav__button {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--touch-target);
  padding-inline: var(--space-3);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  background: linear-gradient(var(--color-primary), var(--color-primary)) no-repeat left bottom / 100% 0;
  border: 0;
  border-radius: var(--radius-control);
  text-align: left;
  width: 100%;
  transition: background-size 260ms var(--ease-out);
}

.site-nav__link:hover,
.site-nav__button:hover,
.site-nav__link[aria-current="page"] {
  background-size: 100% 100%;
}

.site-footer {
  margin-top: 0;
  background: var(--color-footer);
  color: #ffffff;
  font-size: var(--text-sm);
}

.site-footer__grid {
  display: grid;
  gap: var(--space-6);
  padding-block: var(--space-7);
}

.site-footer__heading {
  margin-bottom: var(--space-3);
  font-family: var(--font-body);
  line-height: 1.3;
  font-size: var(--text-md);
  font-weight: 700;
}

.site-footer p {
  color: #f1f1f1;
}

.site-footer a {
  color: #ffffff;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
}

.site-footer__links a,
.site-footer__links button {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  color: #ffffff;
  background: none;
  border: 0;
  padding: 0;
  text-align: left;
  text-decoration: none;
}

.site-footer__links button {
  cursor: pointer;
}

.site-footer__links a:hover,
.site-footer__links button:hover {
  text-decoration: underline;
}

.site-footer__bottom {
  background: var(--color-band);
  font-size: var(--text-xs);
}

.site-footer__bottom .container {
  padding-block: var(--space-3);
  text-align: center;
}

@media (min-width: 48rem) {
  .site-footer__grid {
      grid-template-columns: 2fr 1fr 1fr;
    }
}

@media (min-width: 60rem) {
  .brand__logo {
      height: 2.75rem;
    }

  .nav-toggle {
      display: none;
    }

  .site-nav,
    .site-nav:not([data-open="true"]) {
      position: static;
      display: block;
      background: none;
      border: 0;
      box-shadow: none;
    }

  .site-nav__list {
      flex-direction: row;
      align-items: center;
      gap: var(--space-2);
      width: auto;
      margin: 0;
      padding-block: 0;
    }

  .site-nav__link,
    .site-nav__button {
      width: auto;
      padding-inline: var(--space-4);
    }
}