:root {
  color-scheme: light;
  --ink: #161613;
  --paper: #fffdf7;
  --yellow: #ffca18;
  --muted: #66665f;
  --line: #d8d5ca;
}

* { box-sizing: border-box; }

html { background: var(--paper); }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 1rem;
  line-height: 1.8;
}

main {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  font-weight: 850;
  letter-spacing: .02em;
  text-decoration: none;
}

.mark {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3px;
  width: 42px;
  height: 34px;
  padding: 7px;
  border-radius: 9px;
  background: var(--yellow);
  border: 2px solid var(--ink);
}

.mark i { border-radius: 2px; background: var(--ink); }

h1 {
  margin: 40px 0 14px;
  font-size: clamp(2rem, 7vw, 3.25rem);
  line-height: 1.2;
  letter-spacing: -.035em;
}

h2 {
  margin: 38px 0 8px;
  font-size: 1.2rem;
  line-height: 1.45;
}

p { margin: 0 0 16px; }

.lead {
  margin: 0 0 30px;
  padding: 12px 16px;
  border-left: 5px solid var(--yellow);
  background: #fff8d8;
  font-weight: 700;
}

.meta, footer { color: var(--muted); font-size: .9rem; }

a { color: var(--ink); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 3px; text-decoration-color: var(--yellow); }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

footer {
  margin-top: 42px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

footer p { margin-bottom: 4px; }

@media (max-width: 520px) {
  main { width: min(100% - 28px, 760px); padding-top: 28px; }
  h1 { margin-top: 32px; }
}