/* Toi gian, do tuong phan dat WCAG AA, doc duoc tren mobile. */

:root {
  --ink: #16191d;
  --muted: #4a5158;
  --link: #0b5cab;
  --rule: #d8dde2;
  --bg: #ffffff;
  --code-bg: #f2f4f6;
}

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

body {
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  max-width: 44rem;
  background: var(--bg);
  color: var(--ink);
  font: 1rem/1.65 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

header {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.75rem;
  line-height: 1.25;
}

h2 {
  margin: 2rem 0 0.6rem;
  font-size: 1.15rem;
  line-height: 1.3;
}

.tagline {
  margin: 0;
  color: var(--muted);
}

p,
li {
  margin: 0 0 0.85rem;
}

ul {
  padding-left: 1.35rem;
}

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

a:hover {
  text-decoration: none;
}

a:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
  border-radius: 2px;
}

code {
  padding: 0.1em 0.35em;
  background: var(--code-bg);
  border-radius: 3px;
  font-family: ui-monospace, Consolas, "Courier New", monospace;
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
}

footer nav {
  margin-bottom: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

footer p {
  margin: 0;
  font-size: 0.9rem;
}