* { box-sizing: border-box; }

:root {
  color-scheme: light;
  --canvas: #f7f7f2;
  --paper: #fff;
  --ink: #202920;
  --muted: #535d51;
  --accent: #255742;
  --line: #d8ded5;
  font-family: system-ui, -apple-system, sans-serif;
}

body {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  line-height: 1.65;
}

.shell { width: min(100% - 2rem, 58rem); margin-inline: auto; }
.masthead { background: var(--paper); border-bottom: 1px solid var(--line); }

.bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .25rem 2rem;
  padding-block: .8rem;
}

a { color: var(--accent); text-underline-offset: .2em; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.brand { font-weight: 750; text-decoration: none; font-size: 1.2rem; }
nav { display: flex; flex-wrap: wrap; gap: .15rem 1.2rem; }
nav a { display: inline-block; padding-block: .25rem; }
nav a[aria-current] { font-weight: 700; }
nav a:not([aria-current]):not(:hover) { text-decoration: none; }

main { flex: 1; padding-block: clamp(2rem, 8vw, 5.75rem); }

article {
  max-width: 48rem;
  border: 1px solid var(--line);
  border-top: .25rem solid var(--accent);
  background: var(--paper);
  padding: clamp(1.35rem, 5vw, 3.3rem);
}

h1, h2 { line-height: 1.2; }
h1 { max-width: 19ch; margin: 0 0 1.2rem; font-size: clamp(2rem, 5.8vw, 3.3rem); letter-spacing: -.025em; }
h2 { margin: 2rem 0 .55rem; font-size: 1.25rem; }
p { margin: 0 0 .85rem; max-width: 65ch; }
p:last-child { margin-bottom: 0; }
.intro { color: var(--muted); font-size: 1.125rem; }
.site-footer { color: var(--muted); padding-block: 1rem 1.5rem; border-top: 1px solid var(--line); }
.skip { position: absolute; top: .5rem; left: .5rem; padding: .5rem; background: var(--paper); }
.skip:not(:focus) { transform: translateY(-200%); }