* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    Arial,
    sans-serif;
  line-height: 1.6;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

.site-header,
.site-footer {
  padding: 1.25rem 1.5rem;
}

.site-header h1 {
  margin: 0;
}

.site-footer p {
  margin: 0;
}

.card {
  padding: 1rem 1.25rem;
  border: 1px solid #ddd;
  border-radius: 12px;
}

h1,
h2,
h3,
h4 {
  line-height: 1.25;
}

h2 {
  margin-top: 0;
}

code {
  padding: 0.15em 0.35em;
  border: 1px solid #ddd;
  border-radius: 6px;
}

.nav-list {
  padding-left: 1.25rem;
}

.details summary {
  cursor: pointer;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.details[open] summary {
  margin-bottom: 0.75rem;
}

.image-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-start;
}

.image-row img {
  max-width: 100%;
  height: auto;
  border: 1px solid #ddd;
  border-radius: 10px;
}