:root {
  --font-family: 'Inter', sans-serif;
  --font-size: clamp(1rem, 0.95rem + 0.2vw, 1.125rem);

  --spacing-small: 0.5rem;
  --spacing-standard: 1rem;
  --spacing-large: 2rem;

  /* Color palette */
  --color-dark-slate: #090b10;
  --color-medium-slate: #2d3748;
  --color-light-slate: #4a5568;
  --color-navy: #2c5282;
  --color-teal: #319795;
  --color-white: #ffffff;
  --color-black: #000000;

  --bg: light-dark(var(--color-white), var(--color-dark-slate));
  --bg-contrast: color-mix(in oklab, var(--color-light-slate) 40%, contrast-color(var(--bg)) 60%);
  --text-colour: var(--bg-contrast);
  --heading-colour: color-mix(in oklab, var(--color-navy) 55%, contrast-color(var(--bg)) 45%);
  --accent-colour: color-mix(in oklab, var(--color-teal) 70%, contrast-color(var(--bg)) 30%);
  --border-colour: var(--color-light-slate);
}

@media (prefers-color-scheme: light) {
  html:has(#theme-toggle:checked) {
    --bg: var(--color-dark-slate);
  }
}

@media (prefers-color-scheme: dark) {
  html:has(#theme-toggle:checked) {
    --bg: var(--color-white);
  }
}

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

html {
  color-scheme: light dark;
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  accent-color: var(--accent-colour);
}

body {
  background-color: var(--bg);
  color: var(--text-colour);

  margin: 0;
  padding: var(--spacing-standard);

  font-family: var(--font-family);
  font-size: var(--font-size);
  font-optical-sizing: auto;
  font-weight: 300;
  font-style: normal;
  line-height: 1.6;
  letter-spacing: 0.12em;

  width: 100%;
  overflow: auto;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;

}

header,
footer {
  max-width: 100ch;
  width: 100%;
}

main {
  max-width: 72ch;
  width: 100%;
}

header,
section {
  border-bottom: 2px solid var(--border-colour);
  padding-bottom: var(--spacing-standard);
  margin-bottom: var(--spacing-large);
}

header {
  padding: var(--spacing-large) 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-standard);

  h1 {
    min-width: 40%;
    flex-grow: 1;
    margin: 0;
  }

  nav {
    text-align: right;
    font-style: normal;

    ul {
      margin: 0;
      padding: 0;
      display: flex;
      gap: var(--spacing-standard);
      list-style: none;

      a[aria-current='page'] {
        color: var(--heading-colour);
        font-weight: 700;
        text-decoration-thickness: 0.15em;
        text-underline-offset: 0.25em;
      }
    }
  }
}

section {
  &>article+article {
    margin-top: var(--spacing-large);
  }

  article {
    ul {
      padding-inline-start: 1.4em;

      li+li {
        margin-top: var(--spacing-small);
      }
    }
  }
}

footer {
  text-align: center;
}

h1,
h2,
h3 {
  font-family: var(--font-family);
  line-height: 1.2;
  color: var(--heading-colour);
  margin: var(--spacing-standard) 0 var(--spacing-small);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 900;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
}

h3 {
  font-size: 1.2rem;
  font-weight: 500;
}

strong {
  font-weight: 700;
}

a {
  color: var(--accent-colour);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;

  &:hover {
    text-decoration-thickness: 0.15em;
  }
}

dl {
  margin: 0;
  display: grid;
  grid-template-columns: max-content auto;
  grid-auto-rows: min-content;
  gap: var(--spacing-standard);

  dt,
  dd {
    margin: 0;
  }

  dt {
    font-weight: 700;
  }
}

:focus-visible {
  outline: 3px solid var(--accent-colour);
  outline-offset: 4px;
  border-radius: var(--spacing-small);
}

.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 10;
  padding: var(--spacing-small) var(--spacing-standard);
  color: var(--bg);
  background: var(--text-colour);
  transform: translateY(-120%) translateX(-50%);
}

.skip-link:focus {
  transform: translateY(var(--spacing-standard)) translateX(-50%);
}

.site-title {
  position: absolute;
  top: 0;
  left: 0;
  height: calc(3 * var(--spacing-standard));
  padding: 0 var(--spacing-standard);
  background-color: var(--bg-contrast);
  color: var(--bg);
  border-bottom-right-radius: var(--spacing-standard);

  display: flex;
  align-items: center;
  color: var(--bg);
  text-decoration: none;
  font-weight: 700;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.theme-toggle {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  padding: var(--spacing-standard);
  background-color: var(--bg-contrast);
  color: var(--bg);
  border-bottom-left-radius: var(--spacing-standard);
  cursor: pointer;

  @media (prefers-color-scheme: light) {
    &:active {
      --bg: var(--color-dark-slate);
      --bg-contrast: color-mix(in oklab, var(--color-light-slate) 40%, contrast-color(var(--bg)) 60%);

      &:has(input:checked) {
        --bg: var(--color-white);
        --bg-contrast: color-mix(in oklab, var(--color-light-slate) 40%, contrast-color(var(--bg)) 60%);
      }
    }
  }

  @media (prefers-color-scheme: dark) {
    &:active {
      --bg: var(--color-white);
      --bg-contrast: color-mix(in oklab, var(--color-light-slate) 40%, contrast-color(var(--bg)) 60%);

      &:has(input:checked) {
        --bg: var(--color-dark-slate);
        --bg-contrast: color-mix(in oklab, var(--color-light-slate) 40%, contrast-color(var(--bg)) 60%);
      }
    }
  }

  &:focus-within {
    outline: 3px solid var(--accent-colour);
    outline-offset: 4px;
  }

  &::before,
  &::after {
    content: '';
    display: flex;
    width: var(--spacing-small);
    height: calc(2 * var(--spacing-small));
    border: 1px solid var(--bg);
  }

  &::before {
    border-top-left-radius: var(--spacing-small);
    border-bottom-left-radius: var(--spacing-small);
    background-color: var(--bg);
    border-right: none;
  }

  &::after {
    border-top-right-radius: var(--spacing-small);
    border-bottom-right-radius: var(--spacing-small);
    border-left: none;
  }
}

.specialisms {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-small);
  margin: 0;
  padding: 0;
  list-style: none;

  li+li {
    padding-inline-start: var(--spacing-small);
    border-inline-start: 1px solid var(--border-colour);
  }
}

.job-title {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  width: 100%;

  font-style: italic;
  font-size: 1.2em;
}

.item-details {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-standard);

  .item-primary {
    font-weight: 700;
  }

  .item-secondary {
    font-style: italic;
  }
}

.highlighted-items {
  article {
    padding-inline-start: var(--spacing-standard);
    border-inline-start: 0.25rem solid var(--accent-colour);

    +article {
      margin-top: var(--spacing-large);
    }

    h3 {
      margin-top: 0;
    }
  }
}

.item-context {
  margin-block: var(--spacing-small);
  font-size: 0.9em;
  font-style: italic;
}

@media (max-width: 40rem) {
  header address {
    width: 100%;
    text-align: left;

    ul {
      justify-content: flex-start;
    }
  }

  dl {
    grid-template-columns: 1fr;
    gap: var(--spacing-small);
  }

  dd {
    margin-bottom: var(--spacing-standard);
  }

  .item-details {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (forced-colors: active) {
  .theme-toggle {
    border: 1px solid ButtonText;
  }

  .theme-toggle::before,
  .theme-toggle::after {
    border-color: ButtonText;
  }
}

@media print {
  :root {
    --bg: #ffffff;
    --text-colour: #000000;
    --heading-colour: #000000;
    --accent-colour: #000000;
    --border-colour: #777777;
  }

  body {
    display: block;
    padding: 0;
    font-family: Arial, sans-serif;
    font-size: 10.5pt;
    line-height: 1.4;
  }

  header,
  main,
  footer {
    max-width: none;
  }

  .theme-toggle,
  .skip-link {
    display: none;
  }

  .highlighted-items article,
  section:not(:has(> h2 + article ul)) article {
    break-inside: avoid;
  }

  h2,
  h3 {
    break-after: avoid;
  }

  a {
    color: inherit;
  }
}