body {
  margin: 0;
  background: oklch(0.93 0.006 80);
  font-family: Helvetica, Arial, sans-serif;
  color: #111;
}

::selection {
  background: oklch(0.75 0.14 25);
  color: #fff;
}

a {
  color: #0000EE;
  text-decoration: underline;
}

a:hover {
  color: #000099;
}

.page {
  min-height: 100vh;
  padding: 40px 20px;
  box-sizing: border-box;
}

.sheet {
  width: 100%;
  margin: 0 auto;
  background: #fff;
  border: 2px solid #111;
}

.sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid #111;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: #555;
  text-transform: uppercase;
  letter-spacing: .03em;
  flex-wrap: wrap;
  gap: 8px;
}

.sheet-header strong {
  color: #111;
  font-weight: 600;
}

nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  padding: 16px 24px;
  border-bottom: 1px solid #ddd;
  font-size: 14px;
}

nav .current {
  color: #111;
  font-weight: bold;
}

main {
  padding: 36px 24px 8px;
}

main.tight {
  padding-bottom: 40px;
}

.rule {
  height: 2px;
  background: oklch(0.55 0.19 25);
  width: 60px;
  margin: 0 0 14px;
}

.sheet-footer {
  display: flex;
  flex-wrap: wrap;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  color: #555;
  border-top: 1px solid #111;
}

.sheet-footer span {
  padding: 8px 14px;
  border-right: 1px solid #111;
}

.sheet-footer span:last-child {
  border-right: none;
}

.btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .03em;
  color: #111;
  border: 1px solid #111;
  padding: 9px 16px;
  text-decoration: none;
  display: inline-block;
}

.btn:hover {
  background: #111;
  color: #fff;
}

h1.title {
  font-size: 26px;
  font-weight: bold;
  margin: 0 0 6px;
}

h2.section {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: #111;
  border-bottom: 1px solid #111;
  padding-bottom: 4px;
  margin: 28px 0 12px;
}