:root {
  --ink: #1b1b1f;
  --muted: #4a4a55;
  --paper: #ffffff;
  --rule: #c9c9d1;
  --accent: #1a4fa0;
  --focus: #b3006b;
  --verified-bg: #e3f3e6;
  --verified-ink: #14532d;
  --review-bg: #fff1d6;
  --review-ink: #6b3b00;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
  color: var(--ink);
  background: var(--paper);
}

body {
  margin: 0;
}

a {
  color: var(--accent);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  padding: 0.5rem 1rem;
  background: var(--paper);
}

.skip:focus {
  top: 0.5rem;
}

header,
main,
footer {
  padding: 0 1rem;
  max-width: 90rem;
  margin: 0 auto;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule);
}

.brand a {
  font-weight: 700;
  text-decoration: none;
  color: var(--ink);
}

nav ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a[aria-current="page"] {
  font-weight: 700;
}

footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  color: var(--muted);
}

main:focus {
  outline: none;
}

.pages li {
  margin: 0.75rem 0;
}

.pages .facts,
.pages .source,
.pages .notice {
  display: block;
}

.facts,
.source {
  color: var(--muted);
}

.notice {
  font-weight: 600;
}

.pages .notice {
  font-weight: 400;
  font-size: 0.875rem;
  color: var(--muted);
}

#intro {
  max-width: 46rem;
  padding: 1.5rem 0 1rem;
  border-bottom: 1px solid var(--rule);
}

#intro h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
  text-wrap: balance;
}

#intro .lede {
  font-size: 1.125rem;
  text-wrap: pretty;
}

#intro .counts {
  padding-left: 1.25rem;
}

#intro .counts li {
  margin: 0.4rem 0;
}

#intro .start a {
  display: inline-block;
  padding: 0.5rem 0;
  font-weight: 600;
}

.badge {
  display: inline-block;
  padding: 0 0.4rem;
  margin-right: 0.25rem;
  border: 1px solid currentColor;
  border-radius: 0.25rem;
  font-size: 0.85rem;
  font-weight: 700;
}

.badge.verified {
  background: var(--verified-bg);
  color: var(--verified-ink);
}

.badge.review {
  background: var(--review-bg);
  color: var(--review-ink);
}

.badge.practice,
.badge.w3c,
.badge.builder {
  color: var(--accent);
}

.provenance {
  border-left: 4px solid var(--accent);
  padding-left: 0.75rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.controls p {
  margin: 0;
  font-weight: 600;
}

button {
  font: inherit;
  padding: 0.25rem 0.75rem;
}

button.show {
  padding: 0 0.5rem;
  font-size: 0.9rem;
}

#key-slider {
  width: 16rem;
}

.hint {
  color: var(--muted);
}

.captures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 50rem) {
  .captures {
    grid-template-columns: 1fr;
  }
}

.captures figure {
  margin: 0;
}

.captures img,
.captures svg {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
}

.focus-box,
.focus-box-halo,
.tab-path,
.tab-path-halo {
  fill: none;
}

.focus-box {
  stroke: var(--focus);
  stroke-width: 4;
}

.focus-box-halo,
.tab-path-halo {
  stroke: #ffffff;
  stroke-width: 9;
}

.tab-path {
  stroke: #0a5c8a;
  stroke-width: 4;
}

.tab-stop {
  fill: #0a5c8a;
  stroke: #ffffff;
  stroke-width: 2;
}

.hash {
  word-break: break-all;
}

.disclaimer {
  font-weight: 600;
}

.error {
  color: #9b1c1c;
}

table {
  border-collapse: collapse;
  margin: 1.5rem 0;
}

caption {
  text-align: left;
  font-weight: 700;
  padding-bottom: 0.5rem;
}

th,
td {
  border: 1px solid var(--rule);
  padding: 0.3rem 0.6rem;
  text-align: left;
}

thead th {
  background: #f1f1f4;
}