:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-code: #0f172a;
  --fg: #1b2330;
  --fg-soft: #5b6678;
  --border: #e2e6ec;
  --accent: #5b5bd6;
  --accent-soft: #ececfb;
  --ok: #138a52;
  --warn: #b45309;
  --danger: #c0392b;
  --code-fg: #e2e8f0;
  --tok-comment: #7b8aa3;
  --tok-string: #a5d6a7;
  --tok-number: #ffcc80;
  --tok-keyword: #c4a7ff;
  --tok-type: #7dd3fc;
  --tok-fn: #fde68a;
  --tok-deco: #f9a8d4;
  --tok-flag: #fdba74;
  --header-h: 56px;
  --sidebar-w: 280px;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 4px 16px rgba(15, 23, 42, 0.06);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0b1020;
  --bg-soft: #121933;
  --bg-code: #0a0f1f;
  --fg: #e6eaf4;
  --fg-soft: #98a3bb;
  --border: #232c4a;
  --accent: #8b8cf5;
  --accent-soft: #1b2146;
  --ok: #4ade80;
  --warn: #fbbf24;
  --danger: #f87171;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 20px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font:
    16px/1.65 system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

code,
pre,
kbd {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
}

/* Header */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
}
.brand:hover {
  text-decoration: none;
}
.brand-logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: block;
}
.brand small {
  font-weight: 500;
  color: var(--fg-soft);
  font-size: 0.75rem;
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
}
.spacer {
  flex: 1;
}
.icon-btn,
.search-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--fg);
  border-radius: 8px;
  height: 36px;
  cursor: pointer;
  font: inherit;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
}
.icon-btn:hover,
.search-btn:hover {
  border-color: var(--accent);
}
.search-btn {
  min-width: 220px;
  color: var(--fg-soft);
  justify-content: space-between;
}
.search-btn kbd {
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0 6px;
  background: var(--bg);
}
.menu-btn {
  display: none;
}

/* Layout */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) 220px;
  max-width: 1480px;
  margin: 0 auto;
}

.sidebar {
  position: sticky;
  top: var(--header-h);
  align-self: start;
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 24px 16px 40px 20px;
  border-right: 1px solid var(--border);
}
.sidebar h4 {
  margin: 20px 0 6px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-soft);
}
.sidebar h4:first-child {
  margin-top: 0;
}
.sidebar a {
  display: block;
  padding: 5px 10px;
  border-radius: 7px;
  color: var(--fg);
  font-size: 0.93rem;
}
.sidebar a:hover {
  background: var(--bg-soft);
  text-decoration: none;
}
.sidebar a.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

article {
  padding: 40px 48px 80px;
  min-width: 0;
  max-width: 900px;
}

.toc {
  position: sticky;
  top: var(--header-h);
  align-self: start;
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 40px 16px 40px 8px;
  font-size: 0.85rem;
}
.toc h4 {
  margin: 0 0 8px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-soft);
}
.toc a {
  display: block;
  padding: 3px 0 3px 12px;
  color: var(--fg-soft);
  border-left: 2px solid var(--border);
}
.toc a.h3 {
  padding-left: 26px;
  font-size: 0.82rem;
}
.toc a:hover {
  color: var(--fg);
  text-decoration: none;
}
.toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

/* Typography */
article h1 {
  font-size: 2.3rem;
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
article h2 {
  margin: 56px 0 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}
article h2:first-of-type {
  border-top: 0;
  margin-top: 36px;
  padding-top: 0;
}
article h3 {
  margin: 36px 0 8px;
  font-size: 1.2rem;
}
article h4 {
  margin: 24px 0 6px;
  font-size: 1rem;
}
article .lead {
  font-size: 1.15rem;
  color: var(--fg-soft);
  margin: 0 0 8px;
}
article p,
article li {
  max-width: 74ch;
}
.anchor {
  margin-left: 8px;
  opacity: 0;
  font-weight: 400;
  color: var(--fg-soft);
}
h2:hover .anchor,
h3:hover .anchor {
  opacity: 1;
}

:not(pre) > code {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
}

/* Code blocks */
pre {
  position: relative;
  margin: 16px 0;
  padding: 16px 18px;
  background: var(--bg-code);
  color: var(--code-fg);
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.55;
  border: 1px solid #1e293b;
}
pre code {
  font-size: 0.85rem;
  background: none;
  border: 0;
  padding: 0;
}
pre[data-title]::before {
  content: attr(data-title);
  display: block;
  margin: -16px -18px 12px;
  padding: 8px 18px;
  font:
    600 0.75rem ui-monospace,
    Menlo,
    monospace;
  color: #94a3b8;
  background: #131c33;
  border-bottom: 1px solid #1e293b;
  border-radius: var(--radius) var(--radius) 0 0;
}
.copy {
  position: absolute;
  top: 8px;
  right: 8px;
  appearance: none;
  border: 1px solid #334155;
  background: #1e293b;
  color: #cbd5e1;
  border-radius: 6px;
  font: 0.72rem system-ui;
  padding: 3px 8px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}
pre:hover .copy,
.copy:focus {
  opacity: 1;
}
.tok-c {
  color: var(--tok-comment);
  font-style: italic;
}
.tok-s {
  color: var(--tok-string);
}
.tok-n {
  color: var(--tok-number);
}
.tok-k {
  color: var(--tok-keyword);
}
.tok-t {
  color: var(--tok-type);
}
.tok-f {
  color: var(--tok-fn);
}
.tok-d {
  color: var(--tok-deco);
}
.tok-g {
  color: var(--tok-flag);
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: 16px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
th,
td {
  text-align: left;
  vertical-align: top;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
th {
  background: var(--bg-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-soft);
}
tr:last-child td {
  border-bottom: 0;
}
td:first-child {
  white-space: nowrap;
}

/* Callouts */
.callout {
  margin: 20px 0;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-left-width: 4px;
  background: var(--bg-soft);
}
.callout > :first-child {
  margin-top: 0;
}
.callout > :last-child {
  margin-bottom: 0;
}
.callout strong.label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.callout.note {
  border-left-color: var(--accent);
}
.callout.note .label {
  color: var(--accent);
}
.callout.tip {
  border-left-color: var(--ok);
}
.callout.tip .label {
  color: var(--ok);
}
.callout.warn {
  border-left-color: var(--warn);
}
.callout.warn .label {
  color: var(--warn);
}
.callout.danger {
  border-left-color: var(--danger);
}
.callout.danger .label {
  color: var(--danger);
}

/* Cards and hero */
.hero {
  padding: 56px 0 24px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  background: linear-gradient(120deg, var(--accent), #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lead {
  font-size: 1.3rem;
  max-width: 60ch;
}
.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 9px;
  border: 1px solid var(--border);
  color: var(--fg);
  font-weight: 600;
  background: var(--bg-soft);
}
.btn:hover {
  text-decoration: none;
  border-color: var(--accent);
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.card {
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  color: var(--fg);
}
a.card:hover {
  text-decoration: none;
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.card h3,
.card h4 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}
.card p {
  margin: 0;
  color: var(--fg-soft);
  font-size: 0.92rem;
}
.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--accent-soft);
  color: var(--accent);
  vertical-align: middle;
}
.badge.default {
  background: var(--bg-soft);
  color: var(--fg-soft);
  border: 1px solid var(--border);
}

/* Tabs */
.tabs {
  margin: 16px 0;
}
.tab-list {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
}
.tab-list button {
  appearance: none;
  border: 0;
  background: none;
  color: var(--fg-soft);
  padding: 8px 14px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tab-list button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tabs .panel {
  display: none;
}
.tabs .panel.active {
  display: block;
}

/* Diagram */
.diagram {
  margin: 24px 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  overflow-x: auto;
}
.diagram svg {
  display: block;
  margin: 0 auto;
  min-width: 720px;
  max-width: 100%;
  height: auto;
}
.diagram text {
  fill: var(--fg);
  font: 600 13px system-ui, sans-serif;
}
.diagram .sub {
  fill: var(--fg-soft);
  font-weight: 400;
  font-size: 11.5px;
}
.diagram .box {
  fill: var(--bg);
  stroke: var(--border);
  stroke-width: 1.5;
}
.diagram .box.pending {
  stroke: var(--accent);
}
.diagram .box.active {
  stroke: var(--ok);
}
.diagram .box.failed {
  stroke: var(--danger);
}
.diagram .box.done {
  stroke: var(--fg-soft);
  stroke-dasharray: 5 4;
}
.diagram .edge {
  fill: none;
  stroke: var(--fg-soft);
  stroke-width: 1.5;
}
.diagram .arrow {
  fill: var(--fg-soft);
}

/* Calculator */
.calc {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 20px 0;
  background: var(--bg-soft);
}
.calc-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: end;
  margin-bottom: 12px;
}
.calc label {
  display: grid;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--fg-soft);
}
.calc input[type="number"] {
  width: 110px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
}
.calc .check {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 6px;
}

/* Pager */
.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.pager a {
  display: block;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 200px;
  color: var(--fg);
}
.pager a:hover {
  border-color: var(--accent);
  text-decoration: none;
}
.pager small {
  display: block;
  color: var(--fg-soft);
}
.pager .next {
  margin-left: auto;
  text-align: right;
}

/* Search modal */
.search-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 16px 0;
  background: rgba(8, 12, 28, 0.55);
}
.search-modal.open {
  display: flex;
}
.search-box {
  width: min(640px, 100%);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.search-box input {
  width: 100%;
  padding: 16px 18px;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 1.05rem;
  outline: none;
}
.results {
  max-height: 50vh;
  overflow-y: auto;
}
.results a {
  display: block;
  padding: 10px 18px;
  color: var(--fg);
  border-bottom: 1px solid var(--border);
}
.results a:hover,
.results a.sel {
  background: var(--accent-soft);
  text-decoration: none;
}
.results small {
  color: var(--fg-soft);
  display: block;
}
.results mark {
  background: color-mix(in srgb, var(--accent) 30%, transparent);
  color: inherit;
  border-radius: 3px;
}
.results .empty {
  padding: 18px;
  color: var(--fg-soft);
}

.footer {
  margin-top: 40px;
  color: var(--fg-soft);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 1180px) {
  .layout {
    grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  }
  .toc {
    display: none;
  }
}
@media (max-width: 860px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .menu-btn {
    display: inline-flex;
  }
  .search-btn {
    min-width: 0;
  }
  .search-btn span {
    display: none;
  }
  .sidebar {
    position: fixed;
    z-index: 60;
    left: 0;
    top: var(--header-h);
    width: min(86vw, 320px);
    background: var(--bg);
    transform: translateX(-100%);
    transition: transform 0.2s;
    box-shadow: var(--shadow);
  }
  .sidebar.open {
    transform: none;
  }
  article {
    padding: 24px 20px 64px;
  }
}

@media print {
  .topbar,
  .sidebar,
  .toc,
  .pager,
  .copy {
    display: none;
  }
  .layout {
    display: block;
  }
  pre {
    white-space: pre-wrap;
  }
}