:root {
  --bg-primary: #0f1117;
  --bg-surface: #171a23;
  --text-primary: #e6edf3;
  --text-muted: #a9b7c6;
  --accent: #6ea8fe;
  --border-subtle: #2b3242;
  --danger: #ff6b6b;
  --warning: #f7b955;
  --info: #69b8ff;
  --tip: #63d494;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: radial-gradient(circle at top right, #1a2130 0%, var(--bg-primary) 36%), var(--bg-primary);
  color: var(--text-primary);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  line-height: 1.55;
}

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

a:hover {
  text-decoration: underline;
}

code, pre {
  font-family: "JetBrains Mono", "Fira Code", "Source Code Pro", monospace;
}

pre {
  background: #111623;
  border: 1px solid var(--border-subtle);
  border-radius: 0.625rem;
  padding: 0.9rem;
  overflow-x: auto;
  position: relative;
}

pre code {
  color: #d8e2f2;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

th, td {
  border: 1px solid var(--border-subtle);
  padding: 0.55rem 0.7rem;
  vertical-align: top;
}

th {
  background: #1f2635;
  color: var(--text-primary);
  text-align: left;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(15, 17, 23, 0.9);
  backdrop-filter: blur(8px);
}

.brand {
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.search-wrap {
  margin-left: auto;
  width: min(440px, 50vw);
}

#site-search {
  width: 100%;
  border-radius: 0.5rem;
  border: 1px solid var(--border-subtle);
  background: #111623;
  color: var(--text-primary);
  padding: 0.5rem 0.7rem;
}

.layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 3.1rem;
  height: calc(100vh - 3.1rem);
  overflow-y: auto;
  border-right: 1px solid var(--border-subtle);
  background: rgba(19, 23, 31, 0.92);
  padding: 1rem;
}

.nav-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 1rem 0 0.5rem;
}

.nav-list,
.api-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link,
.api-link {
  display: block;
  padding: 0.35rem 0.45rem;
  border-radius: 0.4rem;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.nav-link:hover,
.api-link:hover,
.nav-link.active,
.api-link.active {
  color: var(--text-primary);
  background: #252d3d;
  text-decoration: none;
}

.nav-group {
  margin: 0.25rem 0;
}

.nav-group > summary {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.92rem;
  padding: 0.3rem 0.1rem;
}

.content {
  padding: 1.2rem 2rem 2rem;
  width: min(1260px, 100%);
}

.breadcrumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: #6f7b8f;
}

.doc-page h1,
.doc-page h2,
.doc-page h3,
.doc-page h4 {
  scroll-margin-top: 5rem;
}

.doc-page h1 {
  margin-top: 0.6rem;
  font-size: clamp(1.6rem, 2.4vw, 2.1rem);
}

.doc-page h2 {
  margin-top: 1.5rem;
  font-size: 1.35rem;
}

.doc-page h3 {
  margin-top: 1.1rem;
  font-size: 1.1rem;
}

.doc-page p,
.doc-page li {
  color: #d5deea;
}

.doc-page ul,
.doc-page ol {
  padding-left: 1.1rem;
}

.anchor-link {
  margin-left: 0.45rem;
  color: #7f8ca1;
  font-size: 0.88em;
  opacity: 0;
}

h1:hover .anchor-link,
h2:hover .anchor-link,
h3:hover .anchor-link,
h4:hover .anchor-link {
  opacity: 1;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.9rem;
  margin-top: 0.8rem;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 0.7rem;
  padding: 0.85rem;
}

.api-item {
  border: 1px solid var(--border-subtle);
  border-radius: 0.7rem;
  margin: 0.8rem 0;
  background: #141925;
}

.api-item > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.7rem 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.api-item > summary::-webkit-details-marker {
  display: none;
}

.api-body {
  padding: 0 0.85rem 0.85rem;
  border-top: 1px solid var(--border-subtle);
}

.api-kind {
  margin-left: auto;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: #b8c3d9;
  border: 1px solid #334058;
  border-radius: 0.3rem;
  padding: 0.1rem 0.35rem;
}

.callout {
  border-left: 4px solid var(--info);
  background: #172131;
  border-radius: 0.5rem;
  padding: 0.65rem 0.85rem;
  margin: 0.9rem 0;
}

.callout.info { border-left-color: var(--info); }
.callout.warning { border-left-color: var(--warning); }
.callout.tip { border-left-color: var(--tip); }
.callout.danger { border-left-color: var(--danger); }

.copy-button {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  border: 1px solid var(--border-subtle);
  background: #1a2232;
  color: var(--text-primary);
  border-radius: 0.35rem;
  padding: 0.2rem 0.45rem;
  font-size: 0.75rem;
  cursor: pointer;
}

.copy-button:hover {
  background: #243048;
}

.sidebar-toggle {
  display: none;
  border: 1px solid var(--border-subtle);
  background: #1a2232;
  color: var(--text-primary);
  border-radius: 0.45rem;
  padding: 0.3rem 0.55rem;
}

.page-footer {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
}

.skip-link:focus {
  left: 0.8rem;
  top: 0.5rem;
  z-index: 99;
  background: #243048;
  color: var(--text-primary);
  padding: 0.45rem;
  border-radius: 0.3rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.hidden-by-filter {
  display: none !important;
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: 3.2rem;
    left: 0;
    width: min(86vw, 340px);
    transform: translateX(-102%);
    transition: transform 0.2s ease-in-out;
    z-index: 30;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-toggle {
    display: inline-block;
  }

  .search-wrap {
    width: min(50vw, 300px);
  }

  .content {
    padding: 1rem;
  }
}