:root {
  --accent: #159957;
  --accent-dark: #155799;
  --text: #24292f;
  --text-muted: #57606a;
  --border: #d0d7de;
  --code-bg: #f6f8fa;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Open Sans", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
}

.page-header-banner {
  display: block;
  width: 100%;
  height: auto;
}

.intro {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  text-align: center;
}

.project-name {
  margin: 0 0 0.3rem;
  font-size: 2.25rem;
  color: var(--accent-dark);
}

.project-tagline {
  margin: 0 0 1.2rem;
  font-weight: normal;
  color: var(--text-muted);
}

.lang-switch {
  margin: 0 0 1.2rem;
  font-size: 0.9rem;
}

.lang-switch a {
  color: var(--accent-dark);
}

.btn {
  display: inline-block;
  margin: 0 0.4rem;
  padding: 0.5rem 1.2rem;
  color: #fff;
  background-color: var(--accent-dark);
  border: 1px solid var(--accent-dark);
  border-radius: 0.3rem;
  text-decoration: none;
}

.btn:hover {
  background-color: var(--accent);
  border-color: var(--accent);
}

.layout {
  display: flex;
  align-items: flex-start;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  gap: 2.5rem;
}

.sidebar {
  flex: 0 0 220px;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}

.sidebar-heading {
  margin: 1.2rem 0 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.sidebar-group:first-child .sidebar-heading {
  margin-top: 0;
}

.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-link {
  display: block;
  padding: 0.3rem 0.6rem;
  margin-inline-start: -0.6rem;
  border-inline-start: 3px solid transparent;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
}

.sidebar-link:hover {
  color: var(--accent-dark);
}

.sidebar-link.active {
  border-inline-start-color: var(--accent);
  color: var(--accent-dark);
  font-weight: 700;
}

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

.back-link {
  margin: 0 0 1.5rem;
  font-weight: 600;
}

.content h1 {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--accent-dark);
}

.content > p:first-child,
.content h1:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.content h2,
.content h3 {
  color: var(--accent-dark);
}

.content a {
  color: #0969da;
}

.content code {
  padding: 0.15rem 0.3rem;
  font-size: 0.9em;
  background-color: var(--code-bg);
  border-radius: 0.3rem;
}

.content pre {
  padding: 0.8rem;
  overflow-x: auto;
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 0.3rem;
}

.content pre code {
  padding: 0;
  background-color: transparent;
}

.content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

.content th,
.content td {
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border);
  text-align: start;
}

.content th {
  background-color: var(--code-bg);
}

.site-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 800px) {
  .layout {
    flex-direction: column;
    /* align-items: flex-start (set above for the desktop side-by-side row)
       stops children from stretching to the full width once the axes swap
       to column here — without this override, a wide child (e.g. a table
       with long unbreakable filenames) grows to its own content width
       instead of being constrained and scrolling horizontally. */
    align-items: stretch;
  }

  .sidebar {
    position: static;
    max-height: none;
    width: 100%;
  }
}