:root {
  font-family:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  color: #181a1d;
  background: #fafafa;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

header,
main,
footer {
  width: min(980px, calc(100% - 40px));
  margin-inline: auto;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 30px 0;
  border-bottom: 1px solid #e3e3e3;
}

.logo {
  font-weight: 750;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 24px;
}

nav a {
  color: #555b63;
  text-decoration: none;
}

.intro {
  padding: 120px 0 90px;
  max-width: 800px;
}

.label {
  margin-bottom: 18px;
  color: #747b83;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  line-height: 1;
  letter-spacing: -.05em;
}

.summary {
  max-width: 650px;
  margin-top: 30px;
  color: #5b6169;
  font-size: 1.15rem;
  line-height: 1.7;
}

.notes {
  border-top: 1px solid #e3e3e3;
}

.notes article {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 20px;
  padding: 30px 0;
  border-bottom: 1px solid #e3e3e3;
}

.notes span {
  color: #8b9096;
}

.notes h2 {
  margin: 0 0 8px;
}

.notes p {
  margin: 0;
  color: #60666e;
}

footer {
  margin-top: 100px;
  padding: 30px 0 50px;
  color: #888e94;
  font-size: .85rem;
}

.error {
  padding-top: 20vh;
}