body {
  margin: 0;
  position: relative;
  font-family: system-ui, sans-serif;
  background: #f4f4f5;
  color: #374151;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 0.75rem;
  z-index: 100;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  background: #111827;
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  width: 1px;
  overflow: hidden;
  white-space: nowrap;
}

.skip-link:focus,
.skip-link:focus-visible {
  clip: auto;
  clip-path: none;
  height: auto;
  width: auto;
  overflow: visible;
  white-space: normal;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
}

.site-nav,
main {
  max-width: 36rem;
  margin-inline: auto;
}

.site-nav {
  padding: 0.75rem 1.5rem;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.25rem;
  justify-content: center;
}

.site-nav a {
  color: #374151;
  text-decoration: none;
  font-weight: 500;
}

.site-nav a:hover {
  color: #111827;
  text-decoration: underline;
}

.site-nav a:focus-visible {
  outline: 2px solid #0284c7;
  outline-offset: 2px;
  border-radius: 2px;
}

main {
  padding: 1.5rem;
}

h1,
h2,
h3 {
  color: #111827;
}

h2 {
  font-size: 1.125rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.info-box {
  max-width: 100%;
  box-sizing: border-box;
  background: #e0f2fe;
  border: 1px solid #0284c7;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  color: #374151;
}

h3 {
  font-size: 1rem;
  margin-top: 1.75rem;
  margin-bottom: 0.65rem;
  font-weight: 600;
}

.lesson-meta {
  margin: 0;
  padding-left: 1.25rem;
  list-style-type: disc;
}

.lesson-meta li {
  margin-bottom: 0.65rem;
  line-height: 1.45;
}

.lesson-meta code,
.handoff-note code,
.contract-reminder code {
  font-size: 0.875em;
  background: #f4f4f5;
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
}

.handoff-note code {
  font-style: normal;
}

.handoff-note {
  font-size: 0.875rem;
  font-style: italic;
  color: #6b7280;
  margin-top: 1.25rem;
  line-height: 1.5;
}

.cmd-cheatsheet {
  margin-top: 1rem;
}

.cmd-cheatsheet summary {
  cursor: pointer;
  font-weight: 600;
  color: #111827;
}

.cmd-cheatsheet summary:focus-visible {
  outline: 2px solid #0284c7;
  outline-offset: 2px;
  border-radius: 2px;
}

.cmd-cheatsheet p {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: #374151;
  line-height: 1.45;
}

.contract-reminder {
  border-left: 3px solid #0284c7;
  padding-left: 1rem;
  margin-top: 1.75rem;
  font-size: 0.875rem;
  color: #374151;
  line-height: 1.45;
}

.contract-reminder p {
  margin: 0;
}

.site-footer {
  margin-top: 0;
  padding: 2rem 1.5rem;
  border-top: 1px solid #e5e7eb;
  background-color: #f9fafb;
  font-size: 0.875rem;
  color: #374151;
  text-align: center;
}