:root {
  --bg: #1d2021;
  --bg-soft: #232627;
  --panel: #282828;
  --panel-2: #32302f;
  --panel-3: #3c3836;

  --text: #ebdbb2;
  --text-soft: #d5c4a1;
  --muted: #bdae93;

  --accent: #83a598;
  --accent-2: #c96a3b;
  --accent-3: #b8bb26;

  --border: #504945;
  --border-soft: #665c54;
  --hover: #3c3836;
  --current: #504945;

  --shadow: rgba(0, 0, 0, 0.28);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --space-1: 0.35rem;
  --space-2: 0.6rem;
  --space-3: 0.9rem;
  --space-4: 1.25rem;
  --space-5: 1.75rem;
  --space-6: 2.5rem;

  --article-bg: rgba(40, 40, 40, 0.55);
  --article-border: var(--border);
}

:root[data-theme="light"] {
  --bg: #f2e5bc;
  --bg-soft: #ebdbb2;
  --panel: #fbf1c7;
  --panel-2: #f9f5d7;
  --panel-3: #ebdbb2;

  --text: #3c3836;
  --text-soft: #504945;
  --muted: #665c54;

  --accent: #076678;
  --accent-2: #c96a3b;
  --accent-3: #79740e;

  --border: #d5c4a1;
  --border-soft: #bdae93;
  --hover: #ebdbb2;
  --current: #e2cca0;

  --shadow: rgba(60, 56, 54, 0.10);
  --article-bg: var(--current);
  --article-border: #d5c4a1;
}

html {
  scroll-behavior: smooth;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  margin: 0;
}

.theme-toggle {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel-3);
  color: var(--text);
  padding: 0.45rem 0.8rem;
  border-radius: 10px;
  cursor: pointer;
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-variant-ligatures: contextual common-ligatures;
  font-size: 0.9rem;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.theme-toggle:hover {
  background: var(--hover);
  border-color: var(--border-soft);
}

.theme-toggle:active {
  transform: translateY(1px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "IBM Plex Sans", system-ui, sans-serif;
  line-height: 1.72;
}

.site-header,
.site-footer {
  padding: var(--space-4) var(--space-5);
  background: var(--panel);
}

.site-header {
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(255,255,255,0.02);
}

.site-header h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent-2);
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
  white-space: pre-line;
}

.layout {
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
  min-height: calc(100vh - 8rem);
  padding: var(--space-5);
}

.sidebar {
  width: 20rem;
  flex-shrink: 0;
  align-self: flex-start;
  position: sticky;
  top: var(--space-5);
  max-height: calc(100vh - (2 * var(--space-5)));

  overflow-y: auto;
  padding: var(--space-4);

  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px var(--shadow);
}

.main-column {
  flex: 1;
  min-width: 0;
}

.main-content {
  background: transparent;
}

.article-content {
  max-width: 62rem;
  padding: var(--space-5) var(--space-6);
  background: var(--article-bg);
  border: 1px solid var(--article-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px var(--shadow);
}

.article-content > :first-child {
  margin-top: 0;
}

.article-content > :last-child {
  margin-bottom: 0;
}

.article-content p,
.article-content ul,
.article-content ol,
.article-content blockquote,
.article-content pre {
  margin-top: 0;
  margin-bottom: 1.05rem;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
  line-height: 1.2;
  margin-top: 2.1rem;
  margin-bottom: 0.85rem;
  color: var(--accent-2);
}

.article-content h1 {
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.article-content h2 {
  font-size: 1.45rem;
}

.article-content h3 {
  font-size: 1.15rem;
  color: var(--accent);
}

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

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

.article-content a:hover {
  text-decoration: underline;
}

.article-content strong {
  color: var(--text);
}

.article-content blockquote {
  margin-left: 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--accent-2);
  color: var(--text-soft);
}

.article-content code,
.article-content pre,
.nav-summary,
.nav-link {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-variant-ligatures: contextual common-ligatures;
}

.article-content code {
  background: var(--panel-3);
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm);
  font-size: 0.94em;
}

.article-content pre {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  box-shadow: 0 8px 24px var(--shadow);
}

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

.nav-root > .nav-item,
.nav-root > .nav-group {
  margin-bottom: var(--space-2);
}

.nav-details {
  border-radius: var(--radius-md);
}

.nav-details[open] {
  background: rgba(80, 73, 69, 0.24);
}

.nav-summary {
  cursor: pointer;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 700;
  font-size: 0.93rem;
}

.nav-summary:hover {
  background: var(--hover);
}

.nav-details[open] > .nav-summary {
  color: var(--accent-2);
}

.nav-framework-top,
.nav-subsections,
.nav-pages,
.nav-sub-pages {
  margin-top: var(--space-2);
}

.nav-framework-top,
.nav-subsections {
  margin-left: 0.75rem;
  padding-left: 0.9rem;
  border-left: 1px solid var(--border);
}

.nav-subgroup {
  margin-left: 0.4rem;
}

.nav-sub-pages {
  margin-left: 1.15rem;
  padding-left: 0.95rem;
  border-left: 1px solid var(--border);
}

.nav-sub-summary {
  font-weight: 600;
  color: var(--text-soft);
}

.nav-item {
  margin-bottom: var(--space-1);
}

.nav-link {
  display: block;
  padding: 0.38rem 0.6rem;
  color: var(--muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
}

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

.nav-link-current {
  color: var(--text);
  background: var(--current);
  font-weight: 600;
  box-shadow: inset 2px 0 0 var(--accent);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--panel);
}

::-webkit-scrollbar-thumb {
  background: var(--border-soft);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

@media (max-width: 900px) {
  .layout {
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-4);
  }

  .sidebar {
    width: 100%;
    box-sizing: border-box;
    margin: 0 auto;
    position: static;
    top: auto;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-nav {
    width: min(100%, 34rem);
    margin: 0 auto;
    box-sizing: border-box;
  }

  .main-column {
    padding: 1rem;
  }

  .article-content {
    padding: var(--space-4);
  }
}