:root {
  color-scheme: dark;
  --bg: #0b1020;
  --bg-elev: #121a32;
  --bg-card: #161f3a;
  --bg-soft: #1d2747;
  --border: #28335a;
  --border-soft: #1f284a;
  --text: #e7ecf7;
  --text-soft: #b4bedb;
  --text-muted: #7c87a8;
  --accent: #19a4ff;
  --accent-2: #0d7de6;
  --accent-soft: rgba(25, 164, 255, 0.18);
  --pink: #ff5ea8;
  --green: #34d399;
  --warn: #f6c177;
  --code-bg: #0e1730;
  --shadow-card: 0 18px 40px -22px rgba(0, 0, 0, 0.6);
  --radius: 14px;
  --radius-sm: 8px;
  --topbar-h: 64px;
  --sidebar-w: 280px;
  --content-max: 880px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "SF Pro Text", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f5f7fb;
    --bg-elev: #ffffff;
    --bg-card: #ffffff;
    --bg-soft: #eef2fa;
    --border: #d8def0;
    --border-soft: #e6ebf5;
    --text: #0e1530;
    --text-soft: #2c365d;
    --text-muted: #5e6a8d;
    --code-bg: #f0f3fa;
    --shadow-card: 0 16px 30px -22px rgba(13, 30, 80, 0.18);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover { color: var(--accent-2); }

code {
  font-family: var(--font-mono);
  background: var(--code-bg);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  background: var(--code-bg);
  padding: 1rem 1.1rem;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.9em;
  line-height: 1.55;
  border: 1px solid var(--border-soft);
}

pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
}

mark {
  background: var(--accent-soft);
  color: inherit;
  padding: 0 2px;
  border-radius: 3px;
}

/* layout */
.docs-app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--topbar-h);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.25rem;
  padding: 0 1.5rem;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(140%) blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-weight: 600;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.16), rgba(17, 12, 34, 0.84));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 12px 28px rgba(0, 0, 0, 0.28);
  flex: 0 0 auto;
}

.brand-mark img { width: 28px; height: 28px; object-fit: contain; display: block; }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-title { font-size: 15px; }
.brand-sub {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.search-shell {
  position: relative;
  display: flex;
  align-items: center;
  max-width: 560px;
  width: 100%;
  margin: 0 auto;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 0.85rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-shell:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
}

.search-shell input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: 0;
  color: var(--text);
  font-size: 14px;
  padding: 0.7rem 0.7rem;
  font-family: inherit;
}

.search-shell input::placeholder { color: var(--text-muted); }

.kbd-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--bg-elev);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 6px;
  margin-left: 0.5rem;
  flex-shrink: 0;
}

.topbar-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  border: 1px solid rgba(167, 139, 250, 0.4);
  background: linear-gradient(135deg, #a78bfa, #7c3aed);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.topbar-cta:hover {
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(167, 139, 250, 0.35);
}

.topbar-cta:active { transform: translateY(0) scale(0.97); }

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  flex: 1;
  min-height: 0;
}

@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .topbar { grid-template-columns: auto 1fr; padding: 0 1rem; }
  .topbar-cta { display: none; }
}

.sidebar {
  position: sticky;
  top: var(--topbar-h);
  align-self: start;
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 1.25rem 1rem 1.25rem 1.5rem;
  border-right: 1px solid var(--border);
  background: var(--bg-elev);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.cat-home {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  color: var(--text-soft);
  font-weight: 500;
  font-size: 13px;
}

.cat-home:hover { background: var(--bg-soft); color: var(--text); }
.cat-home.is-active {
  background: var(--accent-soft);
  color: var(--accent);
}

.cat-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.cat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.7rem 0.7rem 0.35rem;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.cat-head:hover {
  background: var(--bg-soft);
}

.cat-head-main {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-width: 0;
}

.cat-chevron {
  flex: 0 0 auto;
  color: var(--text-muted);
  transform: rotate(90deg);
  transition: transform 0.16s ease;
}

.cat-group.is-collapsed .cat-chevron {
  transform: rotate(0deg);
}

.cat-group.is-collapsed .cat-list {
  display: none;
}

.cat-label {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
}

.cat-count {
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-soft);
  padding: 1px 7px;
  border-radius: 10px;
}

.cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.cat-list li a {
  display: block;
  padding: 0.5rem 0.7rem;
  border-radius: 6px;
  color: var(--text-soft);
  font-size: 13.5px;
  line-height: 1.35;
}

.cat-list li a:hover { background: var(--bg-soft); color: var(--text); }
.cat-list li a.is-active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.cat-empty {
  padding: 0.4rem 0.7rem;
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
}

.sidebar-foot {
  margin-top: 1.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-soft);
  font-size: 11px;
  color: var(--text-muted);
}

.content {
  padding: 2rem 2.5rem 4rem;
  min-width: 0;
}

@media (max-width: 880px) {
  .content { padding: 1.25rem 1rem 3rem; }
}

/* home / hero */
.page-home .hero {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-soft);
}

.eyebrow {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero h1, .doc-head h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.hero-lede {
  margin: 0;
  color: var(--text-soft);
  font-size: 15px;
  max-width: 60ch;
}

.cat-section { margin: 2rem 0; }

.cat-section-head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 0.85rem;
}

.cat-section-head h2 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.badge {
  background: var(--bg-soft);
  color: var(--text-muted);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.85rem;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1rem 1.1rem 0.95rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.2s;
  box-shadow: var(--shadow-card);
}

.card:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  color: var(--text);
}

.card-cat {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
}

.card h3 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: -0.005em;
  line-height: 1.3;
}

.card p {
  margin: 0;
  font-size: 13.5px;
  color: var(--text-soft);
  line-height: 1.45;
}

.card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.4rem;
  padding-top: 0.55rem;
  border-top: 1px dashed var(--border-soft);
}

.card-meta {
  font-size: 11px;
  color: var(--text-muted);
}

.card-arrow {
  color: var(--accent);
  font-size: 16px;
  font-weight: 700;
}

.card-empty {
  border-style: dashed;
  background: transparent;
}

.muted { color: var(--text-muted); }

.empty-state {
  padding: 2.5rem 1.5rem;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}

.empty-state h3 { margin: 0 0 0.4rem; }
.empty-state p { margin: 0; color: var(--text-muted); }

/* doc page */
.page-doc { max-width: var(--content-max); }

.doc-head {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-soft);
}

.back-link {
  display: inline-block;
  margin-bottom: 0.85rem;
  font-size: 13px;
  color: var(--text-muted);
}

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

.doc-meta {
  margin: 0.5rem 0 0;
  font-size: 12.5px;
  color: var(--text-muted);
}

.doc-meta code {
  font-size: 12px;
  background: var(--bg-soft);
}

.doc-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.doc-action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 36px;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s, transform 0.15s;
}

.doc-action-button:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.doc-action-button:active { transform: translateY(0); }

.doc-body-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 1100px) {
  .doc-body-wrap { grid-template-columns: 1fr; }
  .doc-toc { display: none; }
}

.doc-body { font-size: 15px; }

.doc-body h1, .doc-body h2, .doc-body h3, .doc-body h4 {
  margin-top: 1.8rem;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
  line-height: 1.25;
  scroll-margin-top: calc(var(--topbar-h) + 1rem);
}
.doc-body h1 { font-size: 1.65rem; }
.doc-body h2 { font-size: 1.3rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--border-soft); }
.doc-body h3 { font-size: 1.1rem; }
.doc-body h4 { font-size: 1rem; color: var(--text-soft); }
.doc-body p, .doc-body ul, .doc-body ol { margin: 0.6rem 0 0.85rem; }
.doc-body ul, .doc-body ol { padding-left: 1.3rem; }
.doc-body li { margin: 0.25rem 0; }
.doc-body img { max-width: 100%; height: auto; border-radius: 8px; border: 1px solid var(--border-soft); }
.doc-body blockquote {
  margin: 1rem 0;
  padding: 0.6rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 0 8px 8px 0;
  color: var(--text-soft);
}
.doc-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 14px;
}
.doc-body th, .doc-body td {
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border-soft);
}
.doc-body th { background: var(--bg-soft); font-weight: 600; }
.doc-body hr {
  border: 0;
  border-top: 1px solid var(--border-soft);
  margin: 2rem 0;
}

.doc-toc {
  position: sticky;
  top: calc(var(--topbar-h) + 1.5rem);
  font-size: 13px;
  border-left: 1px solid var(--border-soft);
  padding-left: 1rem;
}

.toc-title {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.toc-list a {
  color: var(--text-soft);
  display: block;
  line-height: 1.35;
}

.toc-list a:hover { color: var(--accent); }

.toc-l3 { padding-left: 0.8rem; font-size: 12.5px; }