:root {
  --b1: #111318;
  --b2: #191d24;
  --b3: #222832;
  --bc: #d9e1ee;
  --muted: rgba(217, 225, 238, 0.64);
  --faint: rgba(217, 225, 238, 0.1);
  --primary: #7480ff;
  --primary-soft: rgba(116, 128, 255, 0.16);
  --success: #36d399;
  --warning: #fbbd23;
  --error: #f87272;
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  background: radial-gradient(circle at top left, rgba(116, 128, 255, 0.14), transparent 30rem), var(--b1);
  color: var(--bc);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  background: var(--b2);
  border: 1px solid var(--faint);
  border-radius: 0.4rem;
  padding: 0.1rem 0.35rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}
pre {
  overflow-x: auto;
  background: #0b0d11;
  border: 1px solid var(--faint);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.24);
}
pre code { background: transparent; border: 0; padding: 0; }

.sidebar {
  position: sticky;
  top: 0;
  width: 19rem;
  height: 100vh;
  overflow-y: auto;
  flex: 0 0 auto;
  background: var(--b1);
  border-right: 1px solid rgba(217, 225, 238, 0.12);
  padding: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  margin: 0.35rem 0 1.5rem;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.7rem;
  background: linear-gradient(135deg, var(--primary), #9f7aea);
  color: white;
  font-size: 0.75rem;
  box-shadow: 0 10px 24px rgba(116, 128, 255, 0.3);
}
.nav-section {
  margin-bottom: 0.45rem;
  border: 1px solid transparent;
  border-radius: 0.8rem;
}
.nav-section[open] {
  background: rgba(25, 29, 36, 0.52);
  border-color: rgba(217, 225, 238, 0.08);
}
.nav-section summary {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  list-style: none;
  color: rgba(217, 225, 238, 0.9);
  padding: 0.65rem 0.7rem;
  border-radius: 0.8rem;
  user-select: none;
}
.nav-section summary::-webkit-details-marker { display: none; }
.nav-section summary::before {
  content: '›';
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1;
  transition: transform 0.16s ease;
}
.nav-section[open] summary::before { transform: rotate(90deg); }
.nav-section summary:hover {
  background: rgba(34, 40, 50, 0.8);
  color: white;
}
.nav-section summary span {
  display: grid;
  gap: 0.12rem;
  min-width: 0;
}
.nav-section summary strong {
  font-size: 0.9rem;
  line-height: 1.2;
}
.nav-section summary small,
.nav-link small {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.25;
}
.nav-items {
  display: grid;
  gap: 0.08rem;
  padding: 0 0.4rem 0.5rem 1.15rem;
}
.nav-link {
  display: grid;
  gap: 0.08rem;
  color: rgba(217, 225, 238, 0.86);
  padding: 0.48rem 0.62rem;
  border-radius: 0.55rem;
  font-size: 0.9rem;
}
.nav-link:hover {
  background: var(--b2);
  color: white;
  text-decoration: none;
}
.nav-link.active {
  background: var(--primary-soft);
  color: white;
  box-shadow: inset 0 0 0 1px rgba(116, 128, 255, 0.34);
}
.nav-link.active small { color: rgba(255, 255, 255, 0.68); }
.sidebar-footer {
  display: flex;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--faint);
  font-size: 0.8rem;
}

.main { min-width: 0; flex: 1; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  padding: 1rem 2rem;
  background: var(--b1);
  border-bottom: 1px solid rgba(217, 225, 238, 0.12);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}
.top-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}
.menu-toggle {
  display: none;
  appearance: none;
  border: 1px solid rgba(217, 225, 238, 0.18);
  border-radius: 999px;
  background: var(--b2);
  color: white;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  padding: 0.5rem 0.85rem;
}
.menu-toggle:hover { background: var(--b3); }
.nav-backdrop { display: none; }
.content {
  max-width: 980px;
  padding: 2.25rem 3rem 6rem;
}
h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.05;
  margin: 0 0 0.85rem;
  letter-spacing: -0.045em;
}
h2 {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--faint);
  font-size: 1.85rem;
  line-height: 1.15;
  letter-spacing: -0.035em;
}
h3 { margin-top: 2rem; font-size: 1.25rem; }
p, li { color: rgba(217, 225, 238, 0.82); }
ul { padding-left: 1.2rem; }
li { margin: 0.35rem 0; }

.content > p:first-of-type {
  font-size: 1.08rem;
  color: rgba(217, 225, 238, 0.86);
  max-width: 760px;
}
.content h1 + p {
  font-size: 1.08rem;
}
.content h2 + p,
.content h3 + p { margin-top: 0.25rem; }

.table-wrap {
  overflow-x: auto;
  margin: 1.2rem 0;
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  background: rgba(25, 29, 36, 0.72);
}
table { width: 100%; border-collapse: collapse; }
th, td {
  padding: 0.8rem 0.9rem;
  border-bottom: 1px solid var(--faint);
  text-align: left;
  vertical-align: top;
}
th {
  color: white;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(255, 255, 255, 0.03);
}
tr:last-child td { border-bottom: 0; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.card {
  border: 1px solid var(--faint);
  background: linear-gradient(180deg, rgba(34, 40, 50, 0.82), rgba(25, 29, 36, 0.82));
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.2);
}
.badge {
  display: inline-block;
  border: 1px solid rgba(116, 128, 255, 0.35);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
  color: white;
  background: var(--primary-soft);
  font-size: 0.78rem;
  font-weight: 700;
}

@media (max-width: 900px) {
  body { display: block; }
  body.nav-open { overflow: hidden; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 20;
    width: min(21rem, calc(100vw - 3rem));
    height: 100dvh;
    max-height: none;
    overflow-y: auto;
    border-right: 1px solid rgba(217, 225, 238, 0.14);
    border-bottom: 0;
    box-shadow: 24px 0 56px rgba(0, 0, 0, 0.42);
    transform: translateX(-105%);
    transition: transform 0.18s ease;
  }
  body.nav-open .sidebar { transform: translateX(0); }
  .nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 15;
    display: block;
    background: rgba(0, 0, 0, 0.54);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease;
  }
  body.nav-open .nav-backdrop {
    opacity: 1;
    pointer-events: auto;
  }
  .main { min-height: 100vh; }
  .topbar {
    justify-content: space-between;
    gap: 0.75rem;
    overflow-x: visible;
    padding: 0.75rem 1rem;
  }
  .menu-toggle { display: inline-flex; align-items: center; flex: 0 0 auto; }
  .top-links {
    overflow-x: auto;
    justify-content: flex-end;
    gap: 0.85rem;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }
  .content { padding: 1.5rem 1.1rem 4rem; }
  h1 { font-size: clamp(1.85rem, 9vw, 2.55rem); }
  h2 { font-size: 1.5rem; }
}

@media (max-width: 520px) {
  .topbar { align-items: stretch; }
  .top-links { font-size: 0.9rem; }
  .content { padding-inline: 1rem; }
  .card-grid { grid-template-columns: 1fr; }
  pre { margin-inline: -0.15rem; }
}