:root {
  --bg: #fafaf7;
  --fg: #1c1c1a;
  --muted: #5c5c56;
  --line: #e4e4dc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1.125rem;
  line-height: 1.55;
}

.wrap {
  width: min(40rem, calc(100% - 2.5rem));
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 2.5rem 0 0;
}

.mark {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
}

main {
  flex: 1;
  padding: 2rem 0 3rem;
}

h1 {
  font-size: 2rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0 0 2.25rem;
}

h2 {
  font-size: 1.05rem;
  font-weight: 650;
  margin: 0 0 0.4rem;
}

section {
  margin: 0 0 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

section p {
  margin: 0;
  color: var(--muted);
}

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

a:hover,
a:focus-visible {
  text-decoration-thickness: 2px;
}

footer {
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.95rem;
}

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

footer a {
  color: var(--muted);
}

@media (max-width: 40rem) {
  h1 {
    font-size: 1.7rem;
  }
}