:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1d2327;
  --muted: #5d6870;
  --border: #e3e0d8;
  --accent: #0f766e;
  --accent-soft: #e6f2f0;
  --warn: #b45309;
  --warn-soft: #fdf3e5;
  --code-bg: #f3f1ec;
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181b;
    --surface: #1b2024;
    --text: #e4e7e9;
    --muted: #9aa5ad;
    --border: #2c3338;
    --accent: #2dd4bf;
    --accent-soft: #15302d;
    --warn: #f59e0b;
    --warn-soft: #2e2414;
    --code-bg: #232a2f;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  max-width: 1200px;
  margin: 0 auto;
  gap: 48px;
  padding: 0 24px;
}
nav.toc {
  position: sticky;
  top: 0;
  align-self: start;
  max-height: 100vh;
  overflow-y: auto;
  padding: 40px 0;
  font-size: 14px;
}
nav.toc .brand { font-weight: 700; color: var(--accent); letter-spacing: .02em; margin-bottom: 4px; }
nav.toc .lang { font-size: 13px; color: var(--muted); margin-bottom: 24px; }
nav.toc .lang a { color: var(--muted); }
nav.toc ol { list-style: none; padding: 0; margin: 0; }
nav.toc li { margin: 2px 0; }
nav.toc a { color: var(--text); text-decoration: none; display: block; padding: 4px 8px; border-radius: 6px; }
nav.toc a:hover { background: var(--accent-soft); color: var(--accent); }
nav.toc .downloads { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); }
nav.toc .downloads a { color: var(--accent); }

main { padding: 48px 0 96px; min-width: 0; }
header.doc-head { border-bottom: 1px solid var(--border); padding-bottom: 24px; margin-bottom: 32px; }
.eyebrow { text-transform: uppercase; font-size: 12px; letter-spacing: .12em; color: var(--accent); font-weight: 700; }
h1 { font-size: 40px; line-height: 1.15; margin: 8px 0 12px; letter-spacing: -.02em; }
.lead { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0; }
.meta { font-size: 13px; color: var(--muted); margin-top: 16px; }

h2 { font-size: 26px; margin: 56px 0 12px; letter-spacing: -.01em; scroll-margin-top: 24px; }
h2 .num { color: var(--accent); margin-right: 8px; }
h3 { font-size: 19px; margin: 32px 0 8px; }
p, ul, ol { max-width: 760px; }
a { color: var(--accent); }

code {
  font-family: var(--mono);
  font-size: .88em;
  background: var(--code-bg);
  padding: .1em .35em;
  border-radius: 4px;
  overflow-wrap: anywhere;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.55;
}
pre code { background: none; padding: 0; font-size: inherit; overflow-wrap: normal; }

.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--code-bg); font-weight: 600; font-size: 13px; }
tr:last-child td { border-bottom: none; }
td.r { text-align: right; }

.files { font-size: 14px; color: var(--muted); background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 6px; padding: 10px 14px; margin: 12px 0 16px; max-width: 760px; }
.files strong { color: var(--text); }
.files ul { margin: 4px 0 0; padding-left: 18px; }
.note { background: var(--warn-soft); border-left: 3px solid var(--warn); padding: 10px 14px; border-radius: 6px; font-size: 14.5px; max-width: 760px; }

/* Flow diagram */
.flow { display: grid; gap: 0; margin: 24px 0; max-width: 760px; }
.flow .step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
}
.flow .step .n { width: 36px; height: 36px; border-radius: 50%; background: var(--accent); color: var(--surface); display: grid; place-items: center; font-weight: 700; }
.flow .step h4 { margin: 0 0 2px; font-size: 15px; }
.flow .step p { margin: 0; font-size: 14px; color: var(--muted); }
.flow .step code { font-size: 12px; }
.flow .arrow { height: 22px; width: 2px; background: var(--border); margin-left: 35px; }

.issues { counter-reset: issue; list-style: none; padding: 0; }
.issues li { counter-increment: issue; position: relative; padding: 12px 16px 12px 52px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; margin-bottom: 10px; }
.issues li::before { content: counter(issue); position: absolute; left: 16px; top: 12px; width: 24px; height: 24px; border-radius: 50%; background: var(--warn-soft); color: var(--warn); font-weight: 700; font-size: 13px; display: grid; place-items: center; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; gap: 0; padding: 0 16px; }
  nav.toc { position: static; max-height: none; padding: 24px 0 0; }
  nav.toc ol { display: none; }
  h1 { font-size: 30px; }
}

@media print {
  @page { size: A4; margin: 18mm 16mm; }
  :root { --bg: #fff; --surface: #fff; --text: #111; --muted: #444; --border: #ccc; --accent: #0f766e; --accent-soft: #e6f2f0; --code-bg: #f4f4f4; --warn: #b45309; --warn-soft: #fdf3e5; }
  body { font-size: 11pt; line-height: 1.5; }
  .layout { display: block; max-width: none; padding: 0; }
  nav.toc { display: none; }
  main { padding: 0; }
  h1 { font-size: 26pt; }
  h2 { font-size: 17pt; margin-top: 28pt; break-after: avoid; }
  h3 { break-after: avoid; }
  pre, table, .flow .step, .issues li, .files { break-inside: avoid; }
  pre { white-space: pre-wrap; font-size: 9pt; }
  table { font-size: 9.5pt; }
  a { color: inherit; text-decoration: none; }
  p, ul, ol, .files, .note, .flow { max-width: none; }
}