:root {
  --text: #111;
  --muted: #6f6f6f;
  --border: #e8e8e8;
  --accent: #0080d4;
  --bg: #ffffff;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  overscroll-behavior: none;
}
body {
  margin: 0;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
.layout {
  display: flex;
  min-height: 100vh;
  max-width: 1100px;
  margin: 0 auto;
}

.sidebar {
  width: 240px;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 4rem 1.5rem 3rem;
  display: flex;
  flex-direction: column;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  margin-bottom: 1rem;
}
.langs {
  margin-bottom: 2rem;
}
.langs summary {
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  user-select: none;
}
.langs summary::-webkit-details-marker {
  display: none;
}
.langs summary:hover {
  color: var(--text);
}
.langs nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  margin-top: 0.5rem;
}
.langs nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.1rem 0;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
.langs nav a:hover {
  color: var(--text);
}
.sidebar nav > a {
  margin: 0.25rem 0;
  display: block;
  text-decoration: none;
}
.sidebar nav > .section {
  text-transform: uppercase;
  font-weight: 600;
  display: block;
  font-size: 0.75rem;
  margin-top: 1.25rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  /**/
}
.sidebar nav > a:not(.section) {
  color: var(--text);
}
.sidebar nav > a:not(.section):hover {
  color: var(--accent);
}
.sidebar nav > a.active {
  color: var(--accent);
}

.content {
  flex: 1;
  min-width: 0;
  max-width: 760px;
  padding: 4rem 3rem 6rem;
}
.content h1 {
  font-size: 1.9rem;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 1.25rem;
  font-weight: 700;
}
.content .lead {
  color: var(--muted);
  font-size: 1.1rem;
  margin: -0.5rem 0 1.5rem;
}
.content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 3rem 0 0.75rem;
}
.content p {
  margin: 0 0 1rem;
}
.content ul {
  list-style-type: circle;
  padding-inline-start: 1rem;
  margin: 0 0 1rem;
}
.content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.content a:hover {
  opacity: 0.7;
}

.content pre {
  background: #fafafa;
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}
.content code {
  white-space: break-spaces;
  background-color: var(--border);
  border-radius: 6px;
  margin: 0;
  padding: 0.2em 0.4em;
  font-size: 85%;
}
.content pre code {
  background: none;
  padding: 0;
}

.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0 1.5rem;
  font-size: 0.92rem;
}
.content th,
.content td {
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 0.75rem 0.5rem 0;
  text-align: left;
  vertical-align: top;
}
.content th {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.content td code {
  white-space: nowrap;
}
.content img {
  max-width: 100%;
}

.content blockquote {
  margin: 1rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--border);
  color: var(--muted);
}

.content ol {
  padding-left: 0;
  list-style-position: inside;
}

.list {
  list-style: none;
  padding: 0;
}
.list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.list li:last-child {
  border-bottom: none;
}
.list a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}
.list a:hover {
  opacity: 0.6;
}
.list .desc {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6e6e6;
    --muted: #9a9a9a;
    --border: #2a2a2a;
    --bg: #121212;
  }
  .content pre {
    background: #1a1a1a;
  }
  .content code {
    background-color: hsl(0 0% 20%);
  }
}

.nav-toggle,
.overlay {
  display: none;
}
body.no-scroll {
  overflow: hidden;
}

@media (max-width: 760px) {
  .layout {
    flex-direction: column;
  }
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.5rem;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 120;
    width: 100%;
    height: 3rem;
    padding: 0 1rem;
    background: var(--bg);
    border: none;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    color: var(--text);
  }
  .overlay[hidden] {
    display: none;
  }
  .overlay {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 110;
    background: rgba(0, 0, 0, 0.35);
  }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 115;
    width: 280px;
    height: 100vh;
    max-width: 85vw;
    background: var(--bg);
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .content {
    padding: 4.5rem 1.25rem 2rem;
  }
}