:root {
  --bg: #0f1117;
  --panel: #161b22;
  --panel-2: #1e293b;
  --text: #e6edf3;
  --muted: #9ca3af;
  --border: #2d3748;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.14);
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --header-height: 64px;
  --sidebar-width: 272px;
  --toc-width: 220px;
}

:root[data-theme="light"] {
  --bg: #f8fafc;
  --panel: #ffffff;
  --panel-2: #f1f5f9;
  --text: #111827;
  --muted: #64748b;
  --border: #dbe3ee;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input { font: inherit; }

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-height);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 24px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 750; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: white; font-weight: 900;
}

.search-wrap { flex: 1; max-width: 620px; position: relative; }
.search-wrap input {
  width: 100%; padding: 10px 14px 10px 38px;
  color: var(--text); background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 10px; outline: none;
}
.search-wrap input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search-icon { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--muted); }

.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.icon-btn, .version-select, .menu-btn {
  color: var(--text); background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 9px; padding: 8px 11px; cursor: pointer;
}
.menu-btn { display: none; }

.sidebar {
  position: fixed; top: var(--header-height); bottom: 0; left: 0;
  width: var(--sidebar-width); overflow-y: auto;
  background: var(--panel); border-right: 1px solid var(--border); padding: 22px 16px 36px;
}
.nav-group { margin-bottom: 22px; }
.nav-title { margin: 0 10px 7px; color: var(--muted); font-size: 12px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.nav-link {
  display: block; padding: 8px 10px; margin: 2px 0; border-radius: 8px;
  color: var(--muted); font-size: 14px;
}
.nav-link:hover { color: var(--text); background: var(--accent-soft); text-decoration: none; }
.nav-link.active { color: var(--text); background: var(--accent-soft); border-left: 3px solid var(--accent); }

.layout { min-height: 100vh; padding-top: var(--header-height); margin-left: var(--sidebar-width); }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) var(--toc-width); gap: 52px; max-width: 1240px; margin: 0 auto; padding: 52px 44px 80px; }
main { min-width: 0; max-width: 840px; }
.toc { position: sticky; top: calc(var(--header-height) + 28px); align-self: start; font-size: 13px; }
.toc-title { font-weight: 800; margin-bottom: 10px; }
.toc a { display: block; color: var(--muted); padding: 4px 0 4px 12px; border-left: 1px solid var(--border); }
.toc a:hover { color: var(--accent); text-decoration: none; }

.hero { padding: 56px 0 30px; }
.eyebrow { color: var(--accent); font-weight: 800; letter-spacing: .05em; text-transform: uppercase; font-size: 13px; }
h1 { font-size: clamp(2.4rem, 5vw, 4.8rem); line-height: 1.03; letter-spacing: -.05em; margin: 12px 0 20px; }
h2 { margin-top: 54px; padding-top: 8px; font-size: 1.8rem; letter-spacing: -.02em; }
h3 { margin-top: 34px; font-size: 1.25rem; }
.lead { max-width: 760px; color: var(--muted); font-size: 1.18rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 16px; border-radius: 9px; font-weight: 750; border: 1px solid var(--border); color: var(--text); background: var(--panel); }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: white; border-color: var(--accent); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 28px 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.card h3 { margin-top: 0; margin-bottom: 8px; }
.card p { margin: 0; color: var(--muted); }
.card-icon { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 10px; background: var(--accent-soft); color: var(--accent); margin-bottom: 14px; font-weight: 900; }

pre { position: relative; overflow-x: auto; margin: 20px 0; padding: 20px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; }
code { font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace; font-size: .92em; }
.copy-btn { position: absolute; top: 10px; right: 10px; color: var(--muted); background: var(--panel); border: 1px solid var(--border); padding: 6px 9px; border-radius: 7px; cursor: pointer; font-size: 12px; }
.copy-btn:hover { color: var(--text); }

.callout { margin: 24px 0; padding: 16px 18px; border: 1px solid var(--border); border-left-width: 4px; border-radius: 10px; background: var(--panel); }
.callout strong { display: block; margin-bottom: 4px; }
.callout.note { border-left-color: var(--accent); }
.callout.tip { border-left-color: var(--success); }
.callout.warning { border-left-color: var(--warning); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 22px 0; }
th, td { padding: 12px 14px; text-align: left; border: 1px solid var(--border); }
th { background: var(--panel); }

.page-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 60px; }
.page-nav a { padding: 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel); color: var(--text); }
.page-nav a:last-child { text-align: right; }
.page-nav a:hover { text-decoration: none; border-color: var(--accent); }
.small { color: var(--muted); font-size: 13px; display: block; }

.search-results { display: none; position: absolute; top: 48px; left: 0; right: 0; z-index: 70; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 18px 50px rgba(0,0,0,.25); overflow: hidden; }
.search-results.show { display: block; }
.search-result { display: block; padding: 11px 14px; color: var(--text); border-bottom: 1px solid var(--border); }
.search-result:last-child { border-bottom: 0; }
.search-result:hover { background: var(--accent-soft); text-decoration: none; }

@media (max-width: 1050px) {
  .content-grid { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 820px) {
  .menu-btn { display: inline-flex; }
  .version-select { display: none; }
  .sidebar { transform: translateX(-100%); transition: transform .2s ease; z-index: 60; box-shadow: 14px 0 40px rgba(0,0,0,.25); }
  .sidebar.open { transform: translateX(0); }
  .layout { margin-left: 0; }
  .content-grid { padding: 36px 22px 60px; }
  .feature-grid { grid-template-columns: 1fr; }
  .brand-text { display: none; }
  .topbar { padding: 0 14px; gap: 10px; }
}