:root {
  --bg: #202225;
  --bg-glow: none;
  --panel: #24272c;
  --panel-2: #1d2025;
  --panel-3: #2a2d33;
  --border: rgba(114, 137, 218, 0.42);
  --border-strong: #7289da;
  --border-soft: rgba(255, 255, 255, 0.08);
  --text: #ffffff;
  --muted: #96989d;
  --accent: #7289da;
  --accent-soft: rgba(114, 137, 218, 0.16);
  --code-bg: #191b1f;
  --shadow: 0 22px 54px rgba(0, 0, 0, 0.34);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", ui-sans-serif, sans-serif;
  background: var(--bg);
  background-image: var(--bg-glow);
  color: var(--text);
  text-align: left;
  overflow-x: hidden;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(32, 34, 37, 0.96);
  border-bottom: 1px solid rgba(114, 137, 218, 0.28);
  backdrop-filter: blur(8px);
}
.topbar-inner {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.2rem 1rem;
}
.menu-btn {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  width: 2rem;
  height: 2rem;
  font-size: 1rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}
.brand {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text);
  min-width: 0;
}
.brand a {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  color: inherit;
  text-decoration: none;
  line-height: 1;
}
.brand-logo-shell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  overflow: hidden;
}
.brand-logo {
  display: block;
  width: 2rem;
  height: 2rem;
  object-fit: contain;
}
.brand-text {
  min-width: 0;
  padding-left: 0.2rem;
  white-space: nowrap;
}
.layout {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 272px minmax(0, 1fr);
  gap: 1.15rem;
  padding: 1.15rem;
  align-items: start;
}
.sidebar {
  position: sticky;
  align-self: start;
  background: linear-gradient(180deg, rgba(36, 39, 44, 0.97), rgba(29, 32, 37, 0.98));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 0 0.9rem 0.9rem;
  max-height: calc(100vh - 5rem);
  overflow: auto;
  box-shadow: var(--shadow);
}
.side-nav {
  display: flex;
  flex-direction: column;
}
.nav-section {
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
}
.nav-section-collapsible {
  gap: 0.24rem;
  padding-top: 0.32rem;
}
.nav-section-title {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 1.2rem 0.45rem 0.1rem;
}
.nav-pill {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  text-decoration: none;
  color: #ececec;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.5rem 0.7rem;
  font-size: 0.84rem;
  background: transparent;
  transition: background 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}
.nav-pill.child {
  margin-left: 0.65rem;
  font-size: 0.79rem;
  color: var(--muted);
  background: transparent;
  border-color: transparent;
}
.nav-section-collapsible .nav-pill.child {
  display: none;
}
.nav-section-collapsible.expanded .nav-pill.child,
.nav-section-collapsible .nav-pill.child.active {
  display: flex;
}
.nav-parent {
  justify-content: space-between;
  gap: 0.7rem;
}
.nav-chevron {
  font-size: 0.78rem;
  color: var(--muted);
  margin-left: 0.6rem;
  flex: 0 0 auto;
  transition: transform 0.16s ease, color 0.16s ease;
}
.nav-section-collapsible.expanded .nav-chevron {
  transform: rotate(180deg);
  color: var(--text);
}
.nav-pill:hover {
  border-color: rgba(114, 137, 218, 0.46);
  background: rgba(114, 137, 218, 0.08);
  color: var(--text);
  transform: translateX(1px);
}
.nav-pill.active {
  border-color: var(--border-strong);
  background: rgba(114, 137, 218, 0.12);
  color: var(--text);
  font-weight: 600;
  box-shadow: inset 0 0 0 1px rgba(114, 137, 218, 0.18);
}
.main {
  min-width: 0;
  display: flex;
  justify-content: center;
  padding-bottom: 2rem;
}
.content {
  background: linear-gradient(180deg, rgba(36, 39, 44, 0.98), rgba(32, 34, 37, 0.99));
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 2.35rem;
  box-shadow: var(--shadow);
  width: min(940px, 100%);
  text-align: left;
}
.content h1,
.content h2,
.content h3,
.content h4 {
  text-align: left;
  margin-top: 1.25em;
  color: var(--text);
  line-height: 1.15;
}
.content h1 {
  margin-top: 0.1em;
  margin-bottom: 0.75rem;
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
}
.content h2 {
  font-size: clamp(1.35rem, 2.3vw, 1.75rem);
  padding-top: 0.35rem;
}
.content h3 {
  font-size: 1.15rem;
}
.content .heading-anchor {
  display: block;
  position: relative;
  top: -50px;
  visibility: hidden;
}
.content .heading-link {
  color: var(--muted);
  font-size: 0.6em;
  text-decoration: none;
  vertical-align: middle;
}
.content .heading-link:hover {
  color: var(--accent);
}
.content p,
.content li {
  line-height: 1.72;
  text-align: left;
  color: #f1f1f1;
}
.content strong,
.content b {
  color: var(--text);
}
.content ul,
.content ol {
  text-align: left;
  margin: 0.65rem 0 1.15rem 1.4rem;
  padding: 0;
}
.content li + li {
  margin-top: 0.25rem;
}
.content code {
  background: var(--code-bg);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 0.12rem 0.35rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  color: #d6ddff;
}
.content pre {
  background: #1a1c20;
  color: #f4f4f4;
  padding: 1rem 1.05rem;
  border-radius: 14px;
  overflow-x: auto;
  text-align: left;
  border: 1px solid rgba(114, 137, 218, 0.28);
}
.content pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
}
.content a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}
.content a:hover {
  color: #9fb0f1;
}
.content hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}
.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0 1.4rem;
  overflow: hidden;
  border-radius: 14px;
  border-style: hidden;
  box-shadow: 0 0 0 1px var(--border);
}
.content th,
.content td {
  border: 1px solid var(--border);
  padding: 0.68rem 0.72rem;
  text-align: left;
  vertical-align: top;
}
.content th {
  background: rgba(114, 137, 218, 0.12);
  color: var(--text);
}
.content blockquote {
  margin: 1.2rem 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--accent);
  background: rgba(114, 137, 218, 0.1);
  border-radius: 0 14px 14px 0;
  color: #e7ebff;
}
.doc-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 2.3rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
}
.pager-link,
.pager-spacer {
  min-height: 5rem;
}
.pager-link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.3rem;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(39, 42, 48, 0.96), rgba(31, 34, 39, 0.98));
  padding: 0.9rem 1rem;
  color: inherit;
}
.pager-link.next {
  text-align: right;
  align-items: flex-end;
}
.pager-link:hover {
  border-color: var(--border-strong);
  background: rgba(114, 137, 218, 0.1);
}
.pager-label {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.pager-title {
  font-size: 0.98rem;
  color: var(--text);
}
.backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 38;
}
@media (max-width: 960px) {
  .menu-btn {
    display: inline-flex;
  }
  .layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0.8rem;
  }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: min(82vw, 320px);
    max-height: none;
    border-radius: 0;
    border-left: 0;
    z-index: 39;
    transform: translateX(-104%);
    transition: transform 0.2s ease;
    padding-top: 4.2rem;
  }
  body.nav-open .sidebar {
    transform: translateX(0);
  }
  body.nav-open .backdrop {
    opacity: 1;
    pointer-events: auto;
  }
  .main {
    padding: 0.2rem 0 1.4rem;
  }
  .content {
    padding: 1.3rem;
    border-radius: 18px;
  }
  .doc-pager {
    grid-template-columns: 1fr;
  }
}