:root {
  --crimson: #981e32;
  --gray: #5e6a71;
  --white: #ffffff;
  --ink: #1a1a1a;
  --focus-gap: 4px;
}

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

html {
  color-scheme: light;
  font-size: 100%;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: "Segoe UI", Inter, "Liberation Sans", system-ui, sans-serif;
  line-height: 1.4;
}

body::before {
  content: "";
  display: block;
  height: 8px;
  background: var(--crimson);
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  transform: translateY(-200%);
  background: var(--crimson);
  color: var(--white);
  padding: 0.7rem 1rem;
  font-weight: 700;
  text-decoration: none;
  z-index: 2;
}

.skip:focus {
  transform: none;
  outline: 3px solid var(--gray);
  outline-offset: var(--focus-gap);
}

.masthead,
main,
.colophon {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  padding-top: 1.75rem;
  padding-bottom: 1.25rem;
}

h1 {
  margin: 0;
  color: var(--crimson);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.02;
  text-wrap: balance;
}

.subtitle {
  margin: 0.35rem 0 0;
  color: var(--gray);
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  font-weight: 600;
  line-height: 1.2;
}

#open-all {
  appearance: none;
  background: var(--white);
  color: var(--crimson);
  border: 3px solid var(--crimson);
  border-radius: 2px;
  font: inherit;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.2;
  min-height: 3.5rem;
  padding: 0.75rem 1.35rem;
  cursor: pointer;
}

#open-all:hover,
#open-all:focus-visible {
  background: var(--crimson);
  color: var(--white);
}

#open-all:focus-visible {
  outline: 3px solid var(--gray);
  outline-offset: var(--focus-gap);
}

main {
  padding-bottom: 1.5rem;
}

main:focus {
  outline: none;
}

.help {
  margin: 0;
  max-width: 46rem;
  color: var(--gray);
  font-size: 1.125rem;
  line-height: 1.45;
  text-wrap: pretty;
}

.help strong {
  color: var(--crimson);
  font-weight: 700;
}

.status {
  margin: 0;
  color: var(--crimson);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
}

.status:not(:empty) {
  margin-top: 0.85rem;
}

.groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem 2rem;
  align-items: start;
  margin-top: 1.75rem;
}

h2 {
  margin: 0 0 0.85rem;
  padding-bottom: 0.4rem;
  border-bottom: 3px solid var(--crimson);
  color: var(--gray);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.25;
  text-wrap: balance;
}

.demos {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.demos li {
  margin: 0;
  min-width: 0;
}

.demo {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.75rem;
  padding: 0.9rem 1.15rem 0.9rem 1.05rem;
  border: 2px solid var(--gray);
  border-left: 8px solid var(--crimson);
  border-radius: 2px;
  background: var(--white);
  color: var(--ink);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
  scroll-margin: 1rem;
  touch-action: manipulation;
}

.label {
  min-width: 0;
}

.hint {
  flex: 0 0 auto;
  color: var(--gray);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.demo:hover,
.demo:active,
.demo:focus-visible {
  background: var(--crimson);
  border-color: var(--crimson);
  color: var(--white);
}

.demo:hover .hint,
.demo:active .hint,
.demo:focus-visible .hint {
  color: var(--white);
}

.demo:focus-visible {
  outline: 3px solid var(--gray);
  outline-offset: var(--focus-gap);
}

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

.colophon {
  margin-top: 0.5rem;
  margin-bottom: 2rem;
  padding-top: 1rem;
  border-top: 2px solid var(--gray);
  color: var(--gray);
  font-size: 1rem;
}

.colophon p {
  margin: 0;
}

::selection {
  background: var(--crimson);
  color: var(--white);
}

#groups:focus {
  outline: none;
}

@media (max-width: 800px) {
  .masthead,
  main,
  .colophon {
    width: min(1120px, calc(100% - 1.5rem));
  }

  .masthead {
    flex-direction: column;
    align-items: stretch;
  }

  .groups {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  #open-all {
    width: 100%;
  }

  .demo {
    font-size: 1.2rem;
    min-height: 4.25rem;
  }
}

@media (max-width: 420px) {
  .demo {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

@media (prefers-contrast: more) {
  .demo {
    border-width: 3px;
    border-left-width: 10px;
  }

  #open-all {
    border-width: 4px;
  }
}

@media (forced-colors: active) {
  .demo,
  #open-all,
  .skip {
    border: 2px solid ButtonText;
  }

  .demo:focus-visible,
  #open-all:focus-visible,
  .skip:focus {
    outline: 3px solid Highlight;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  body::before {
    print-color-adjust: exact;
  }

  .skip,
  .open-all,
  .help,
  .status,
  .hint,
  noscript {
    display: none;
  }

  .demo {
    border-left-color: var(--crimson);
    print-color-adjust: exact;
  }

  .demo::after {
    content: " " attr(href);
    display: block;
    margin-top: 0.25rem;
    color: var(--gray);
    font-size: 0.85rem;
    font-weight: 400;
  }
}