:root {
--bg: #f6f8fa;
--panel: #ffffff;
--text: #24292f;
--muted: #57606a;
--border: #d0d7de;
--accent: #0969da;
--accent-soft: #ddf4ff;
--code-bg: #f6f8fa;
--focus-ring: rgba(9, 105, 218, 0.35);
--max-content-width: 980px;
--sidebar-width: 260px;
}

* {
  box-sizing: border-box;
  }

html {
scroll-behavior: smooth;
}

body {
min-width: 320px;
margin: 0;
background: var(--bg);
color: var(--text);
font-family:
-apple-system,
BlinkMacSystemFont,
"Segoe UI",
Helvetica,
Arial,
sans-serif,
"Apple Color Emoji",
"Segoe UI Emoji";
line-height: 1.65;
}

a {
color: var(--accent);
text-decoration: none;
}

a:hover {
text-decoration: underline;
}

a:focus-visible {
outline: 3px solid var(--focus-ring);
outline-offset: 3px;
border-radius: 4px;
}

/* ------------------------------------------------------------
Accessibility
------------------------------------------------------------ */

.skip-link {
position: absolute;
left: -9999px;
top: 8px;
z-index: 100;
padding: 8px 12px;
background: var(--panel);
border: 1px solid var(--border);
border-radius: 8px;
}

.skip-link:focus {
left: 8px;
}

/* ------------------------------------------------------------
Layout
------------------------------------------------------------ */

.site-shell {
display: flex;
min-height: 100vh;
}

.site-sidebar {
width: var(--sidebar-width);
flex: 0 0 var(--sidebar-width);
background: var(--panel);
border-right: 1px solid var(--border);
}

.sidebar-inner {
position: sticky;
top: 0;
display: flex;
flex-direction: column;
height: 100vh;
padding: 28px 22px;
}

.site-main {
flex: 1;
min-width: 0;
padding: 42px 40px;
}

.page-content {
max-width: var(--max-content-width);
margin: 0 auto;
padding: 42px 52px;
overflow-wrap: break-word;
background: var(--panel);
border: 1px solid var(--border);
border-radius: 16px;
}

/* ------------------------------------------------------------
Sidebar header
------------------------------------------------------------ */

.site-title {
color: var(--text);
font-size: 20px;
font-weight: 700;
letter-spacing: -0.02em;
}

.site-title:hover {
text-decoration: none;
}

.site-subtitle {
margin: 8px 0 24px;
color: var(--muted);
font-size: 13px;
line-height: 1.45;
}

/* ------------------------------------------------------------
Sidebar navigation
------------------------------------------------------------ */

.site-nav {
display: block;
}

.nav-section {
display: flex;
flex-direction: column;
gap: 6px;
}

.nav-link {
display: block;
padding: 9px 11px;
color: var(--text);
font-size: 14px;
font-weight: 500;
border-radius: 8px;
}

.nav-link:hover {
background: var(--bg);
text-decoration: none;
}

.nav-link.active {
background: var(--accent-soft);
color: var(--accent);
font-weight: 700;
}

/* ------------------------------------------------------------
Sidebar footer
------------------------------------------------------------ */

.sidebar-footer {
display: flex;
flex-direction: column;
gap: 6px;
margin-top: auto;
padding-top: 24px;
color: var(--muted);
font-size: 12px;
}

.sidebar-footer a {
font-weight: 600;
overflow-wrap: anywhere;
}

/* ------------------------------------------------------------
Content typography
------------------------------------------------------------ */

.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4 {
line-height: 1.25;
letter-spacing: -0.02em;
}

.page-content h1 {
margin-top: 0;
padding-bottom: 0.35em;
border-bottom: 1px solid var(--border);
font-size: 2.1rem;
}

.page-content h2 {
margin-top: 2.2em;
padding-bottom: 0.25em;
border-bottom: 1px solid var(--border);
font-size: 1.45rem;
}

.page-content h3 {
margin-top: 1.8em;
font-size: 1.15rem;
}

.page-content p {
margin: 0.8em 0;
}

.page-content ul,
.page-content ol {
padding-left: 1.35rem;
}

.page-content li {
margin: 0.25em 0;
}

.page-content blockquote {
margin: 1rem 0;
padding: 0.5rem 1rem;
color: var(--muted);
background: var(--bg);
border-left: 4px solid var(--border);
border-radius: 8px;
}

.page-content hr {
margin: 2rem 0;
border: 0;
border-top: 1px solid var(--border);
}

/* ------------------------------------------------------------
Images and tables
------------------------------------------------------------ */

.page-content img {
display: block;
max-width: 100%;
height: auto;
margin: 18px auto;
border: 1px solid var(--border);
border-radius: 12px;
}

.page-content table {
display: block;
width: 100%;
max-width: 100%;
margin: 18px 0;
overflow-x: auto;
border-collapse: collapse;
-webkit-overflow-scrolling: touch;
}

.page-content th,
.page-content td {
padding: 10px 12px;
border: 1px solid var(--border);
vertical-align: top;
}

.page-content th {
background: var(--bg);
font-weight: 700;
}

/* ------------------------------------------------------------
Code blocks
------------------------------------------------------------ */

.page-content code {
padding: 0.15em 0.35em;
overflow-wrap: anywhere;
background: var(--code-bg);
border-radius: 5px;
font-size: 0.92em;
}

.page-content pre {
max-width: 100%;
padding: 16px;
overflow: auto;
background: var(--code-bg);
border: 1px solid var(--border);
border-radius: 10px;
}

.page-content pre code {
padding: 0;
overflow-wrap: normal;
white-space: pre;
background: transparent;
}

/* ------------------------------------------------------------
Responsive layout
------------------------------------------------------------ */

@media (max-width: 900px) {
.site-shell {
display: block;
}

.site-sidebar {
width: 100%;
border-right: none;
border-bottom: 1px solid var(--border);
}

.sidebar-inner {
position: static;
height: auto;
padding: 18px 18px 14px;
}

.site-title {
font-size: 18px;
}

.site-subtitle {
margin-bottom: 14px;
}

.nav-section {
display: grid;
grid-template-columns: repeat(4, minmax(0, 1fr));
gap: 8px;
}

.nav-link {
padding: 10px 8px;
text-align: center;
border: 1px solid var(--border);
}

.sidebar-footer {
flex-direction: row;
flex-wrap: wrap;
align-items: center;
gap: 6px 16px;
margin-top: 14px;
padding-top: 14px;
border-top: 1px solid var(--border);
}

.sidebar-footer span {
flex-basis: 100%;
}

.site-main {
padding: 18px 12px;
}

.page-content {
padding: 24px 18px;
border-radius: 12px;
}

.page-content h1 {
font-size: 1.65rem;
}

.page-content h2 {
font-size: 1.25rem;
}
}

@media (max-width: 560px) {
.nav-section {
grid-template-columns: repeat(2, minmax(0, 1fr));
}

.sidebar-footer {
align-items: flex-start;
}

.site-main {
padding: 12px 8px;
}

.page-content {
padding: 20px 14px;
border-radius: 10px;
}

.page-content th,
.page-content td {
padding: 8px 10px;
}
}