.button {
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.375rem;
  padding: 0 1.875rem;
  border: 1px solid var(--color-ink-soft);
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.18em;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);

  &:is(a, button):hover,
  &.solid {
    border-color: var(--color-accent);
    background-color: var(--color-accent);
    color: var(--color-accent-contrast);
  }

  &.solid:is(a, button):hover {
    border-color: var(--color-ink);
    background-color: var(--color-ink);
  }

  &:active {
    transform: translateY(1px);
  }

  &.has-arrow {
    padding-inline: 34px;

    .content {
      position: relative;
      display: inline-block;
    }

    .label {
      position: relative;
      z-index: 1;
      display: inline-block;
      transition: transform 320ms var(--ease-out);
    }

    .arrow {
      position: absolute;
      top: 50%;
      left: 100%;
      margin-left: -4px;
      width: 1.25em;
      height: 1.25em;
      margin-top: -0.625em;
      opacity: 0;
      transform: translateX(-10px);
      transition:
        transform 320ms var(--ease-out),
        opacity 240ms var(--ease-out);
    }

    &:is(a, button):focus-visible {
      .label {
        transform: translateX(-12px);
      }

      .arrow {
        opacity: 1;
        transform: none;
      }
    }

    @media (hover: hover) {
      &:is(a, button):hover {
        .label {
          transform: translateX(-12px);
        }

        .arrow {
          opacity: 1;
          transform: none;
        }
      }
    }

    &:is(a, button):active .arrow {
      transform: translateX(4px);
    }

    @media (prefers-reduced-motion: reduce) {
      .label,
      .arrow {
        transition-duration: 0ms;
      }
    }
  }
}

/* The skip link: the gold pill button, parked above the page until it gets
   focus. The selector outranks .button's own rules. */
a.button.skip-link {
  position: absolute;
  z-index: 10;
  inset-block-start: var(--space-xs);
  inset-inline-start: var(--space-xs);
  transform: translateY(-200%);
}

a.button.skip-link:focus-visible {
  transform: translateY(0);
}

.logo {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 1.625rem;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1;
  text-transform: none;

  .dot {
    color: var(--color-accent);
    font-style: normal;
  }
}

a:is(:hover, :focus-visible) > .logo .dot {
  animation: logo-blink 1s steps(1) infinite;
}

@keyframes logo-blink {
  0% {
    opacity: 0;
  }

  50% {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .logo .dot {
    animation: none !important;
  }
}

.nav-link {
  display: inline-block;
  padding-block: var(--space-sm);
  margin-block: calc(-1 * var(--space-sm));
  color: var(--color-ink-soft);
  text-decoration-line: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.45em;

  &:hover {
    color: var(--color-accent);
  }

  &[aria-current="page"] {
    color: var(--color-ink);
    text-decoration-color: var(--color-accent);
  }
}

.site-header {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0 var(--space-xl);
  width: 100%;
  max-width: var(--width-wide);
  margin-inline: auto;
  padding: var(--space-sm) var(--gutter);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-caps);
  line-height: var(--leading-body);
  text-transform: uppercase;

  .brand {
    padding-block: var(--space-sm);
    text-decoration: none;
  }

  .list {
    display: flex;
    flex-wrap: wrap;
    gap: 0 var(--space-lg);
    padding: 0;
    list-style: none;
  }

  .item {
    display: block;
    padding-block: var(--space-sm);
  }

  .toggle {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    inline-size: 2.75rem;
    block-size: 2.75rem;
    margin-inline-end: -0.6875rem;
    padding: 0;
    border: 0;
    background: none;
    color: var(--color-ink-soft);
    cursor: pointer;

    &:hover {
      color: var(--color-accent);
    }
  }

  .bar {
    display: block;
    inline-size: 1.375rem;
    block-size: 2px;
    border-radius: 1px;
    background-color: currentColor;
    transition:
      transform var(--duration-fast) var(--ease-out),
      opacity var(--duration-fast) var(--ease-out);
  }

  .toggle[aria-expanded="true"] {
    color: var(--color-accent);

    .bar:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

    .bar:nth-child(2) {
      opacity: 0;
    }

    .bar:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .item {
      animation-delay: 0ms !important;
    }
  }

  @media (max-width: 40rem) {
    &[data-menu] {
      .toggle {
        display: flex;
      }

      .list {
        display: none;
      }

      &[data-open] .list {
        display: flex;
        flex-direction: column;
        gap: 0;
        position: absolute;
        inset-inline: 0;
        inset-block-start: 100%;
        padding: var(--space-xs) var(--gutter) var(--space-sm);
        border-block: var(--border-rule);
        background-color: var(--color-paper-raised);
        animation: header-menu-open var(--duration-base) var(--ease-out);
      }

      &[data-open] .item {
        animation: header-menu-item var(--duration-base) var(--ease-out) backwards;

        &:nth-child(1) { animation-delay: 60ms; }
        &:nth-child(2) { animation-delay: 110ms; }
        &:nth-child(3) { animation-delay: 160ms; }
        &:nth-child(4) { animation-delay: 210ms; }
        &:nth-child(5) { animation-delay: 260ms; }
      }

      .item > a {
        display: block;
      }
    }
  }
}

@keyframes header-menu-open {
  from {
    opacity: 0;
    transform: translateY(-0.5rem);
    clip-path: inset(0 0 100% 0);
  }

  to {
    opacity: 1;
    transform: none;
    clip-path: inset(0);
  }
}

@keyframes header-menu-item {
  from {
    opacity: 0;
    transform: translateY(-0.375rem);
  }
}

.site-footer {
  width: 100%;
  max-width: var(--width-wide);
  margin-inline: auto;
  padding: var(--space-2xl) var(--gutter) var(--space-xl);
  border-block-start: var(--border-rule);
  display: grid;
  grid-template-columns: 1fr auto;
  column-gap: var(--space-xl);
  align-items: start;

  .inner {
    display: contents;
  }

  .who {
    display: grid;
    gap: var(--space-2xs);
    justify-items: start;
  }

  .name {
    text-decoration: none;
  }

  .name:is(:hover, :focus-visible) .logo {
    color: var(--color-accent);
  }

  .name:is(:hover, :focus-visible) .logo .dot {
    color: var(--color-ink);
  }

  .email {
    padding-block: var(--space-sm);
    margin-block: calc(-1 * var(--space-sm));
    color: var(--color-ink-soft);

    &:hover {
      color: var(--color-accent);
    }
  }

  ul {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs) var(--space-lg);
    padding: 0;
    list-style: none;
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: var(--tracking-caps);
    text-transform: uppercase;
  }

  .menu {
    display: grid;
    grid-template-rows: auto 1fr;
    gap: var(--space-xl);
  }

  .scores {
    align-self: end;
  }

  .scores dl {
    display: grid;
    grid-template-columns: repeat(4, auto);
    justify-content: center;
    gap: var(--space-sm);
    margin: 0;
  }

  .scores dl > div {
    display: flex;
    flex-direction: column-reverse;
    justify-content: flex-end;
    align-items: center;
    gap: var(--space-xs);
    text-align: center;
  }

  .scores dt {
    color: var(--color-ink-soft);
    font-size: var(--text-xs);
    line-height: 1.25;
    white-space: nowrap;
  }

  .scores dd {
    position: relative;
    display: grid;
    place-items: center;
    inline-size: 2.875rem;
    aspect-ratio: 1;
    margin: 0;
    font-family: var(--font-display);
    font-size: var(--text-base);
    line-height: 1;
    font-variant-numeric: tabular-nums;

    &::before {
      content: "";
      position: absolute;
      inset: 0;
      border-radius: 50%;
      background: conic-gradient(
        var(--color-accent) calc(var(--score) * 1%),
        var(--color-rule) 0
      );
      mask: radial-gradient(
        farthest-side,
        transparent calc(100% - 3px),
        #000 calc(100% - 2.5px)
      );
    }
  }

  .legal {
    margin-block-start: var(--space-xl);
    color: var(--color-ink-dim);
    font-size: var(--text-xs);
  }

  .legal + .legal {
    margin-block-start: var(--space-2xs);
  }

  @media (min-width: 40.0625rem) {
    .who {
      grid-column: 2;
      grid-row: 1;
    }

    .menu {
      display: contents;
    }

    nav {
      grid-column: 1;
      grid-row: 1;
      justify-self: start;
    }

    .scores {
      grid-column: 1;
      grid-row: 2 / span 2;
      justify-self: start;
    }

    .legal {
      grid-column: 2;
      justify-self: start;
      align-self: end;
      max-width: 30rem;
    }
  }

  @media (max-width: 40rem) {
    display: block;

    .inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: var(--space-2xl);
      text-align: center;
    }

    .who {
      order: -1;
      gap: var(--space-lg);
      justify-items: center;
    }

    ul {
      justify-content: center;
      gap: var(--space-sm) var(--space-lg);
      font-size: var(--text-xs);
    }

    .menu {
      gap: var(--space-2xl);
      justify-items: center;
    }

    .scores dl {
      column-gap: var(--space-md);
    }

    .legal {
      margin-block-start: var(--space-2xl);
      margin-inline: auto;
      text-align: center;
    }

    .legal + .legal {
      margin-block-start: var(--space-2xs);
    }
  }
}

.dust {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: clip;
  pointer-events: none;

  .field {
    position: sticky;
    top: 0;
    height: 100vh;
  }

  i {
    position: absolute;
    border-radius: 50%;
    background-color: color-mix(in srgb, var(--color-accent) calc(var(--o) * 100%), transparent);
    box-shadow: 0 0 6px 1px color-mix(in srgb, var(--color-accent) calc(var(--o) * 50%), transparent);
    opacity: 0;
    animation: dust-twinkle var(--d) steps(var(--n)) var(--delay) infinite both;

    &.vanish {
      animation-name: dust-vanish;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    i,
    i.vanish {
      animation: none;
      opacity: 0.4;
    }
  }
}

@keyframes dust-twinkle {
  0%,
  100% {
    opacity: 0.3;
  }
  50% {
    opacity: 1;
  }
}

@keyframes dust-vanish {
  0%,
  100% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
}

.star {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  width: 9rem;
  height: 1px;
  background-image: linear-gradient(to right, transparent, var(--color-accent));
  transform-origin: right center;
  opacity: 0;
  pointer-events: none;

  &::after {
    content: "";
    position: absolute;
    top: -1px;
    right: -1px;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background-color: var(--color-ink);
    box-shadow: 0 0 6px 1px rgb(245 196 81 / 0.6);
  }
}

.backdrop {
  position: relative;
  isolation: isolate;
}

.page {
  width: 100%;
  max-width: var(--width-wide);
  margin-inline: auto;
  padding: var(--space-2xl) var(--gutter) var(--space-section);

  > .page-heading {
    display: grid;
    justify-items: center;
    gap: var(--space-md);
    padding-block: var(--space-xl) var(--space-3xl);
    text-align: center;

    > h1 {
      font-weight: 300;

      em {
        color: var(--color-accent);
        font-weight: 300;
      }
    }

    > .intro {
      margin-block-start: var(--space-md);
      max-width: 80ch;
      color: var(--color-ink-soft);
      font-size: var(--text-lg);

      p {
        max-width: inherit;
        text-wrap: balance;
      }
    }
  }

  > .body {
    display: grid;
    gap: var(--space-section);

    > * {
      inline-size: 100%;
      margin-inline: auto;
    }
  }
}

.home {
  position: relative;
  isolation: isolate;
}

.closing {
  display: grid;
  justify-items: center;
  gap: var(--space-md);
  inline-size: 100%;
  padding-block-start: var(--space-3xl);
  border-block-start: var(--border-rule);
  text-align: center;

  h2 {
    max-inline-size: 13em;
    margin-block-end: var(--space-xl);
  }

  .email {
    color: var(--color-ink-dim);
    font-size: var(--text-sm);
  }
}

.check-list li {
  display: flex;
  gap: var(--space-sm);

  &::before {
    content: "";
    flex: none;
    inline-size: 0.45em;
    block-size: 0.85em;
    margin-block-start: 0.25em;
    margin-inline: 0.2em 0.35em;
    border-inline-end: 2px solid var(--color-accent);
    border-block-end: 2px solid var(--color-accent);
    transform: rotate(45deg);
  }
}