:root {
  --bg-primary: #0a0e14;
  --bg-secondary: #13171d;
  --bg-tertiary: #1a1f26;

  --text-primary: #b3b1ad;
  --text-secondary: #7a7770;
  --text-muted: #6a6560;

  --accent: #ffb454;
  --accent-dim: #d4976c;
  --border: #1f2430;

  --code-bg: #13171d;

  --sidebar-width: 240px;

  /* Fonts */
  --font-heading: 'IBM Plex Mono', 'SF Mono', 'Monaco', 'Consolas', monospace;
  --font-body: 'IBM Plex Sans', -apple-system, system-ui, sans-serif;
  --font-code: 'IBM Plex Mono', 'SF Mono', 'Monaco', 'Consolas', monospace;

  /* Font Sizes */
  --font-size-base: 18px;
  --font-size-lg: 20px;
  --font-size-sm: 16px;
  --font-size-xs: 14px;
  --font-size-code: 15px;

  /* Heading sizes */
  --font-size-h1: 32px;
  --font-size-h2: 24px;
  --font-size-h3: 20px;
  --font-size-h4: 18px;

  /* Navigation sizes */
  --font-size-nav: 16px;
  --font-size-nav-header: 20px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.65;
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
}

/* Sidebar - Fixed Left */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  z-index: 50;
  transition: transform 0.3s ease;
}

body.sidebar-collapsed .sidebar {
  transform: translateX(-100%);
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 2rem 1.5rem;
}

.sidebar-header {
  margin-bottom: 2.5rem;
}

.sidebar-header h1 {
  font-family: var(--font-heading);
  font-size: var(--font-size-nav-header);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.sidebar-header h1 a {
  color: var(--accent);
  text-decoration: none;
}

.sidebar-header h1 a:hover {
  text-decoration: underline;
}

.sidebar-header h1 a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.site-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Sidebar Navigation */
.sidebar-nav {
  flex: 1;
}

.nav-section {
  margin-bottom: 0.5rem;
}

.nav-link {
  display: block;
  padding: 0.4rem 0;
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-code);
  font-size: var(--font-size-nav);
  transition: color 0.2s;
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--accent);
}

.nav-link:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-prefix {
  color: var(--text-muted);
  margin-right: 0.25rem;
}

/* Nav Subsections */
.nav-subsection {
  margin-left: 2ch;
}

.nav-sublink {
  display: block;
  padding: 0.3rem 0;
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-code);
  font-size: var(--font-size-nav);
  transition: color 0.2s;
}

.nav-sublink:hover {
  color: var(--text-secondary);
}

.nav-sublink.active {
  color: var(--accent-dim);
}

.nav-sublink:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Sidebar Footer */
.sidebar-footer {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.footer-link {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color 0.2s;
}

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

.footer-link:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.link-prefix {
  color: var(--accent-dim);
  margin-right: 0.25rem;
}

/* Sidebar Toggle */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 100;
  width: 36px;
  height: 36px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

.sidebar-toggle:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

body.sidebar-collapsed .sidebar-toggle {
  background: var(--bg-tertiary);
}

.toggle-icon {
  display: block;
  position: relative;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  margin: 0 auto;
}

.toggle-icon::before,
.toggle-icon::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  left: 0;
}

.toggle-icon::before {
  top: -5px;
}

.toggle-icon::after {
  top: 5px;
}

/* Main Content - Full Width */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  transition: margin-left 0.3s ease;
}

body.sidebar-collapsed .main-content {
  margin-left: 0;
}

.content-inner {
  max-width: 900px;
  padding: 3rem 3rem 4rem;
}

/* Article Styles */
article {
  margin-bottom: 4rem;
}

.article-header {
  margin-bottom: 2rem;
}

.article-header h1 {
  font-family: var(--font-heading);
  font-size: var(--font-size-h1);
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.article-description {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

.article-content h2 {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  font-weight: 600;
  margin: 3rem 0 1rem;
  color: var(--text-primary);
}

.article-content h3 {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--text-primary);
}

.article-content h4 {
  font-family: var(--font-heading);
  font-size: var(--font-size-h4);
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.article-content ul,
.article-content ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
  color: var(--text-primary);
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-dim);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.article-content a:visited {
  color: var(--accent);
  text-decoration-color: var(--accent-dim);
}

.article-content a:hover {
  text-decoration-color: var(--accent);
}

.article-content a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Code Styles */
code {
  font-family: var(--font-code);
  font-size: var(--font-size-code);
  background: var(--code-bg);
  color: var(--accent);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--border);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-dim);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border-radius: 4px;
  line-height: 1.5;
}

pre code {
  background: none;
  color: var(--text-primary);
  padding: 0;
  border: none;
  font-size: var(--font-size-xs);
}

/* Lists */
.section-list,
.page-list {
  margin-top: 3rem;
}

.section-list h2,
.page-list h2 {
  font-family: var(--font-heading);
  font-size: var(--font-size-h4);
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.section-list ul,
.page-list ul {
  list-style: none;
  padding: 0;
}

.section-list li,
.page-list li {
  margin-bottom: 1.25rem;
  padding-left: 1rem;
  border-left: 2px solid var(--border);
  transition: border-color 0.2s;
}

.section-list li:hover,
.page-list li:hover {
  border-left-color: var(--accent-dim);
}

.section-list a,
.page-list a {
  color: var(--accent);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.section-list a:hover,
.page-list a:hover {
  text-decoration: underline;
}

.section-list p,
.page-list p {
  margin-top: 0.4rem;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Footer */
.footer {
  margin-top: auto;
  padding: 2rem 3rem;
  border-top: 1px solid var(--border);
}

.footer p {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(0);
  }

  body.sidebar-collapsed .sidebar {
    transform: translateX(-100%);
  }

  .sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .main-content {
    margin-left: 0;
  }

  .content-inner {
    padding: 4rem 1.5rem 3rem;
  }
}