* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: #1c1c1c;
  background: #fff;
}

a {
  color: #0b57d0;
}

a:hover {
  text-decoration: none;
}

/* Header */

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid #e0e0e0;
  background: #f7f7f7;
}

.site-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1c1c1c;
  text-decoration: none;
}

.site-links {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
}

/* Layout */

.layout {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  max-width: 60rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
}

.sidebar {
  flex: 0 0 13rem;
}

.sidebar ul {
  margin: 0;
  padding: 0;
  list-style: none;
  position: sticky;
  top: 1rem;
}

.sidebar li {
  margin: 0;
}

.sidebar a {
  display: block;
  padding: 0.25rem 0.5rem;
  border-left: 2px solid transparent;
  color: #444;
  text-decoration: none;
  font-size: 0.95rem;
}

.sidebar a:hover {
  color: #0b57d0;
}

.sidebar a.active {
  border-left-color: #0b57d0;
  color: #0b57d0;
  font-weight: 600;
}

.content {
  flex: 1 1 24rem;
  min-width: 0;
}

/* Content */

.content h1 {
  font-size: 1.6rem;
  margin: 0 0 1rem;
  line-height: 1.25;
}

.content h2 {
  font-size: 1.2rem;
  margin-top: 2rem;
}

.content h3 {
  font-size: 1.05rem;
  margin-top: 1.5rem;
}

.content img {
  max-width: 100%;
}

.content table {
  border-collapse: collapse;
  width: 100%;
  display: block;
  overflow-x: auto;
}

.content th,
.content td {
  border: 1px solid #e0e0e0;
  padding: 0.4rem 0.6rem;
  text-align: left;
}

.content th {
  background: #f7f7f7;
}

.content code {
  background: #f2f2f2;
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-size: 0.9em;
}

.content pre {
  background: #f2f2f2;
  padding: 0.75rem;
  overflow-x: auto;
}

.content pre code {
  background: none;
  padding: 0;
}

/* Footer */

.site-footer {
  border-top: 1px solid #e0e0e0;
  padding: 1rem 1.25rem;
  font-size: 0.85rem;
  color: #666;
  text-align: center;
}

.site-footer p {
  margin: 0.25rem 0;
}

/* Small screens: sidebar above content */

@media (max-width: 40rem) {
  .sidebar {
    flex-basis: 100%;
  }

  .sidebar ul {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .sidebar a {
    border-left: none;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    padding: 0.15rem 0.5rem;
  }
}