:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #101214;
  --muted: #4b5563;
  --accent: #0f766e;
  --panel: #f4f7f8;
  --border: #d1d5db;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9da7b3;
    --accent: #4fd1c5;
    --panel: #161b22;
    --border: #30363d;
  }
}

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

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: clamp(1.06rem, 0.22vw + 1rem, 1.18rem);
  line-height: 1.6;
}

.layout {
  max-width: 46rem;
  margin: 0 auto;
  padding: 1.2rem 1rem 3rem;
}

h1,
h2 {
  line-height: 1.25;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.8rem);
}

h2 {
  margin-top: 2rem;
  font-size: clamp(1.45rem, 1.15vw + 1.1rem, 1.9rem);
}

.lead {
  font-size: clamp(1.34rem, 1.25vw + 1rem, 1.7rem);
  margin: 0.5rem 0 0;
}

p,
li {
  max-width: 70ch;
}

ul {
  padding-left: 1.2rem;
}

pre {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.9rem;
  overflow-x: auto;
}

.ua-box,
.callout {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.75rem 0.9rem;
}

.meme {
  margin: 1.2rem 0 1.6rem;
}

.meme img {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  display: block;
}

.meme figcaption {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

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

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:focus-visible,
.skip-link:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -10rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  padding: 0.4rem 0.6rem;
  color: var(--fg);
}

.skip-link:focus {
  top: 0.5rem;
}

@media (max-width: 640px) {
  .layout {
    padding-top: 1rem;
  }
}