:root {
  --ink: #0b1220;
  --muted: #4b5563;
  --line: #e5e7eb;
  --paper: #ffffff;
  --canvas: #f4f6f8;
  --blue: #2563ff;
  --blue-hover: #1d4ed8;
  --amber: #f59e0b;
  --header-ink: #d5dbe3;
  --read: 40rem;
  --chrome: 68rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--blue-hover);
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  transform: translateY(-150%);
  background: white;
  color: var(--ink);
  padding: 0.4rem 0.7rem;
  z-index: 2;
}

.skip:focus {
  transform: none;
}

.site-header,
.site-footer {
  width: 100%;
  background: var(--ink);
  padding-inline: max(1rem, calc((100% - var(--chrome)) / 2));
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 0.95rem;
}

.brand {
  color: white;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand:hover {
  color: white;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
}

.site-nav a {
  color: var(--header-ink);
  font-size: 0.92rem;
  text-decoration: none;
  padding-block: 0.2rem;
}

.site-nav a:hover {
  color: white;
}

.site-nav a[aria-current="page"] {
  color: white;
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--amber);
}

main {
  width: min(100% - 2rem, var(--read));
  margin-inline: auto;
  padding-block: 2.25rem 3.5rem;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

h2 {
  position: relative;
  margin: 2.6rem 0 0.75rem;
  padding-top: 0.95rem;
  font-size: 1.3rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h2::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2.25rem;
  height: 3px;
  border-radius: 2px;
  background: var(--amber);
}

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
}

p,
li {
  max-width: var(--read);
}

.definition {
  margin: 1.35rem 0 0;
  padding: 1.25rem 1.35rem 1.2rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 6px solid var(--amber);
  border-radius: 0.65rem;
  box-shadow: 0 1px 2px rgba(11, 18, 32, 0.05);
}

.definition p,
.card p {
  margin: 0.75rem 0 0;
}

.definition p:first-child,
.card p:first-child {
  margin-top: 0;
}

.source {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.card {
  margin: 0;
  padding: 1rem 1.1rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.65rem;
}

.pair {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.1rem;
}

ul,
ol {
  margin: 0.8rem 0 0;
  padding-left: 1.3rem;
}

ul li::marker,
ol li::marker {
  color: var(--blue);
  font-weight: 700;
}

li + li {
  margin-top: 0.7rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.4rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.45rem 1rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
}

.button-primary {
  background: var(--blue);
  color: white;
}

.button-primary:hover {
  background: var(--blue-hover);
  color: white;
}

.button-secondary {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
}

.button-secondary:hover {
  background: #eef2f6;
  color: var(--ink);
}

.faq {
  margin-top: 0.4rem;
}

.faq dt {
  margin-top: 1.15rem;
  font-weight: 700;
}

.faq dt:first-child {
  margin-top: 0;
}

.faq dd {
  margin: 0.4rem 0 0;
  padding: 0.75rem 0.95rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  color: var(--muted);
}

.table-wrap {
  margin-top: 1.1rem;
  overflow-x: auto;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.65rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th[scope="row"] {
  width: 6.5rem;
  white-space: nowrap;
  color: var(--ink);
}

th,
td {
  padding: 0.85rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

th {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

thead th {
  background: var(--ink);
  color: white;
  border-bottom: 0;
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}

.site-footer {
  padding-block: 1.6rem 2rem;
  color: var(--header-ink);
  font-size: 0.92rem;
}

.site-footer a {
  color: #e7ebf0;
}

.site-footer a:hover {
  color: white;
}

.site-footer p {
  margin: 0.35rem 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
}

@media (min-width: 720px) {
  .pair {
    grid-template-columns: 1fr 1fr;
  }
}