/* InvoiceGuard docs — printed ledger, matching the marketing site.
   Same language as site/assets/css/style.css: pale green account-book
   paper, sheet-white artifacts, double rules over section titles,
   figures and commands in mono, pine ink, stamp red reserved for
   warnings. Shape rule: paper artifacts 2px, controls 4px. */

@font-face {
  font-family: "Libre Franklin";
  src: url("../fonts/franklin-400.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Libre Franklin";
  src: url("../fonts/franklin-400i.woff2") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "Libre Franklin";
  src: url("../fonts/franklin-500.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Libre Franklin";
  src: url("../fonts/franklin-700.woff2") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Libre Franklin";
  src: url("../fonts/franklin-800.woff2") format("woff2");
  font-weight: 800; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Libre Franklin";
  src: url("../fonts/franklin-900.woff2") format("woff2");
  font-weight: 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/plexmono-400.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/plexmono-500.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/plexmono-600.woff2") format("woff2");
  font-weight: 600; font-style: normal; font-display: swap;
}

:root {
  --paper: #eff3e9;
  --sheet: #fcfcf7;
  --ink: #182420;
  --ink-soft: #3d4a42;
  --faint: #5c6b62;
  --pine: #0c4a3a;
  --pine-deep: #093528;
  --pine-hover: #0a3d2f;
  --stamp: #a62b1f;
  --rule: #cbd6c6;
  --rule-dark: #a9bba4;
  --chip: #e4ecdc;
  --term-bg: #14231c;
  --term-ink: #dce8d8;
  --term-comment: #7fa88e;
  --sans: "Libre Franklin", "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--chip); color: var(--pine-deep); }
:focus-visible { outline: 2px solid var(--stamp); outline-offset: 3px; }
code { font-family: var(--mono); font-size: 0.86em; }

/* ---------- header (mirrors the marketing site nav) ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(239, 243, 233, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule-dark);
  box-shadow: 0 1px 0 rgba(252, 252, 247, 0.7);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 66px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}
.brand:hover { color: var(--ink); }
.brand em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--pine-deep);
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  padding: 3px 7px 2px;
}
.brand-mark { display: block; }
.top-links { display: flex; gap: 22px; margin-left: 4px; align-items: center; }
.top-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  white-space: nowrap;
}
.top-links a:hover { color: var(--pine); text-decoration: underline; text-underline-offset: 4px; }
.site-link {
  border: 1px solid var(--pine);
  border-radius: 4px;
  padding: 7px 15px !important;
  color: var(--pine) !important;
  font-weight: 700;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.site-link:hover { background: var(--pine); color: var(--sheet) !important; text-decoration: none !important; transform: translateY(-1px); }
.search-wrap { margin-left: auto; position: relative; }
#search-input {
  width: 240px;
  background: var(--sheet);
  border: 1px solid var(--rule-dark);
  border-radius: 4px;
  color: var(--ink);
  padding: 8px 12px;
  font-size: 14px;
  font-family: var(--sans);
}
#search-input::placeholder { color: var(--faint); }
#search-input:focus { outline: 2px solid var(--stamp); outline-offset: 1px; border-color: var(--rule-dark); }
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 360px;
  max-height: 420px;
  overflow: auto;
  background: var(--sheet);
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  box-shadow: 0 18px 36px -18px rgba(24, 36, 32, 0.35);
  padding: 6px;
  z-index: 60;
}
.search-results a {
  display: block;
  padding: 9px 12px;
  border-radius: 2px;
  text-decoration: none;
  color: var(--ink);
}
.search-results a:hover { background: var(--chip); }
.search-results .sr-title { font-weight: 700; font-size: 14px; }
.search-results .sr-desc { font-size: 12.5px; color: var(--ink-soft); }
.search-results .sr-empty { padding: 12px; color: var(--faint); font-size: 14px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 10px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; }

.tabs { border-top: 1px solid var(--rule); }
.tab-list {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  list-style: none;
  display: flex;
  gap: 4px;
}
.tab-item { margin: 0; }
.tab-link {
  display: block;
  padding: 10px 16px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
}
.tab-link:hover { color: var(--pine); }
.tab-link[data-active="true"] { color: var(--pine); font-weight: 700; border-bottom-color: var(--pine); }

/* ---------- layout ---------- */
.layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 36px 24px 72px;
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr) 220px;
  gap: 44px;
  align-items: start;
}

/* ---------- sidebar (ledger index) ---------- */
.sidebar { position: sticky; top: 132px; max-height: calc(100vh - 154px); overflow: auto; }
.nav-group { margin-bottom: 24px; }
.nav-group-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--faint);
  margin: 0 0 9px;
  font-weight: 600;
}
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-list li { margin: 2px 0; }
.nav-item {
  display: block;
  padding: 7px 12px;
  border-radius: 2px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14.5px;
  border-left: 2px solid transparent;
}
.nav-item:hover { background: var(--sheet); color: var(--ink); }
.nav-item[data-active="true"] {
  background: var(--chip);
  color: var(--pine-deep);
  font-weight: 700;
  border-left-color: var(--pine);
}
.sidebar-foot {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--rule-dark);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--faint);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}
.sidebar-foot a { color: var(--ink-soft); text-decoration: none; padding: 0 10px; }
.sidebar-foot a:first-child { padding-left: 0; }
.sidebar-foot a + a { border-left: 1px solid var(--rule-dark); }
.sidebar-foot a:hover { color: var(--pine); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- content (the sheet) ---------- */
.content { min-width: 0; }
.doc {
  background: var(--sheet);
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  padding: 46px 54px 50px;
  box-shadow: 0 1px 2px rgba(24, 36, 32, 0.07), 0 28px 48px -32px rgba(24, 36, 32, 0.35);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--pine);
  font-weight: 600;
  margin: 0 0 12px;
}
.doc-title {
  font-size: 37px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 26px;
  font-weight: 800;
}
.doc h2 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.25;
  color: var(--ink);
  margin: 46px 0 14px;
  padding-top: 24px;
  position: relative;
  scroll-margin-top: 140px;
}
.doc h2::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  border-top: 2px solid var(--ink);
  box-shadow: 0 4px 0 -1px var(--sheet), 0 5px 0 0 var(--rule-dark);
}
.doc h2:first-of-type { margin-top: 8px; }
.doc h3 {
  font-size: 17.5px;
  font-weight: 700;
  color: var(--ink);
  margin: 28px 0 10px;
  scroll-margin-top: 140px;
}
.doc h4 { font-size: 15.5px; font-weight: 700; margin: 22px 0 8px; }
.doc p { margin: 0 0 16px; }
.doc a { color: var(--pine); text-decoration: underline; text-underline-offset: 3px; }
.doc a:hover { color: var(--pine-hover); }
.doc ul, .doc ol { margin: 0 0 16px; padding-left: 24px; }
.doc li { margin: 6px 0; }
.doc li::marker { color: var(--pine); }
.doc hr {
  border: 0;
  border-top: 2px solid var(--ink);
  box-shadow: 0 4px 0 -1px var(--sheet), 0 5px 0 0 var(--rule-dark);
  margin: 36px 0;
}
.doc blockquote {
  border-left: 3px solid var(--pine);
  background: var(--chip);
  margin: 0 0 18px;
  padding: 13px 18px;
  border-radius: 0 2px 2px 0;
}
.doc blockquote p { margin: 0; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--chip);
  border-radius: 2px;
  padding: 1px 6px;
  color: var(--pine-deep);
}
pre.codeblock {
  background: var(--term-bg);
  color: var(--term-ink);
  border-radius: 2px;
  padding: 20px 22px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.65;
  margin: 0 0 22px;
  position: relative;
  box-shadow: 0 18px 32px -24px rgba(24, 36, 32, 0.45);
}
pre.codeblock code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }
pre.codeblock::before {
  content: attr(data-lang);
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--term-comment);
  font-family: var(--mono);
}

.table-wrap {
  overflow-x: auto;
  margin: 0 0 22px;
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  background: var(--sheet);
}
.doc table { width: 100%; border-collapse: collapse; font-size: 14.5px; margin: 0; font-variant-numeric: tabular-nums; }
.doc th {
  text-align: left;
  padding: 11px 14px;
  font-weight: 700;
  font-size: 13.5px;
  color: var(--ink);
  border-bottom: 2px solid var(--ink);
  white-space: nowrap;
}
.doc td { padding: 11px 14px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.doc tbody tr:last-child td { border-bottom: 0; }
.doc td code, .doc th code { background: var(--chip); color: var(--pine-deep); white-space: nowrap; }
.doc th code { background: none; }

.admonition {
  display: flex;
  gap: 12px;
  border: 1px solid var(--rule-dark);
  border-left: 3px solid var(--pine);
  border-radius: 2px;
  padding: 14px 18px;
  margin: 0 0 20px;
  background: var(--sheet);
  color: var(--ink-soft);
}
.admonition.note { border-left-color: var(--pine); }
.admonition.tip { border-left-color: var(--pine-deep); background: var(--chip); color: var(--pine-deep); }
.admonition.warning { border-left-color: var(--stamp); background: rgba(166, 43, 31, 0.05); }
.admonition.danger { border-left-color: var(--stamp); background: rgba(166, 43, 31, 0.09); }
.admon-icon { flex: 0 0 auto; margin-top: 3px; }
.admonition.note .admon-icon, .admonition.tip .admon-icon { color: var(--pine); }
.admonition.warning .admon-icon, .admonition.danger .admon-icon { color: var(--stamp); }
.admon-title {
  font-family: var(--mono);
  font-weight: 600;
  margin: 0 0 4px !important;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink);
}
.admonition.warning .admon-title, .admonition.danger .admon-title { color: var(--stamp); }
.admon-body p { margin: 0 0 6px; font-size: 14.5px; }
.admon-body p:last-child { margin-bottom: 0; }

.doc img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  box-shadow: 0 18px 36px -24px rgba(24, 36, 32, 0.35);
  margin: 8px 0 22px;
  display: block;
}

.toc-mobile { display: none; margin-bottom: 20px; }
.toc-mobile details {
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  padding: 11px 15px;
  background: var(--sheet);
}
.toc-mobile summary { cursor: pointer; font-weight: 700; color: var(--pine); font-size: 15px; }

.prev-next { display: flex; gap: 16px; margin-top: 46px; }
.page-prev, .page-next {
  flex: 1;
  border: 1px solid var(--rule-dark);
  border-radius: 2px;
  padding: 16px 20px;
  text-decoration: none !important;
  display: block;
  background: var(--sheet);
  transition: border-color .15s ease, transform .15s ease;
}
.page-next { text-align: right; margin-left: auto; }
.page-prev:hover, .page-next:hover { border-color: var(--pine); transform: translateY(-1px); }
.prev-next-label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--faint);
}
.prev-next-title { display: block; font-weight: 700; color: var(--pine) !important; font-size: 16px; margin-top: 5px; }

.doc-footer {
  margin-top: 32px;
  padding-top: 22px;
  border-top: 2px solid var(--ink);
  box-shadow: 0 -5px 0 -1px var(--paper), 0 -6px 0 0 var(--rule-dark);
  font-size: 13.5px;
  color: var(--faint);
  text-align: center;
}
.doc-footer a { color: var(--ink-soft); }
.doc-footer a:hover { color: var(--pine); }
.doc-footer .foot-links a { padding: 0 10px; }
.doc-footer .foot-links a + a { border-left: 1px solid var(--rule-dark); }

/* ---------- right TOC ---------- */
.toc-side { position: sticky; top: 132px; max-height: calc(100vh - 154px); overflow: auto; }
.toc-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--faint);
  font-weight: 600;
  margin: 0 0 10px;
}
.toc-list { list-style: none; margin: 0; padding: 0; font-size: 13.5px; }
.toc-list li { margin: 5px 0; }
.toc-list a { color: var(--ink-soft); text-decoration: none; border-left: 2px solid var(--rule); padding-left: 12px; display: block; }
.toc-list a:hover { color: var(--pine); border-left-color: var(--pine); }
.toc-sub { list-style: none; margin: 4px 0 0; padding: 0 0 0 14px; font-size: 12.5px; }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .layout { grid-template-columns: 230px minmax(0, 1fr); }
  .toc-side { display: none; }
  .toc-mobile { display: block; }
}
@media (max-width: 880px) {
  .layout { grid-template-columns: minmax(0, 1fr); padding: 20px 16px 48px; }
  .sidebar {
    position: fixed;
    inset: 112px 0 auto 0;
    z-index: 40;
    background: var(--paper);
    border-bottom: 1px solid var(--rule-dark);
    max-height: 60vh;
    padding: 16px 24px;
    display: none;
    box-shadow: 0 12px 30px rgba(24, 36, 32, .18);
  }
  .sidebar.open { display: block; }
  .nav-toggle { display: block; flex: 0 0 auto; }
  .top-links { display: none; }
  .header-inner { gap: 12px; padding: 0 16px; }
  .search-wrap { flex: 1 1 auto; min-width: 0; }
  #search-input { width: 100%; }
  .doc { padding: 28px 22px; }
  .doc-title { font-size: 29px; }
  .doc h2 { font-size: 21px; }
  .tab-list { overflow-x: auto; }
  .tab-link { white-space: nowrap; }
  .prev-next { flex-direction: column; }
  .page-next { text-align: left; margin-left: 0; }
}
@media (max-width: 480px) {
  .brand em { display: none; }
  .brand { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .page-prev, .page-next, .site-link { transition: none; }
}