/* =========================================================================
   IMVP · Docs — design system
   Clean, modern documentation. Brand accent blue #2563EB. Light mode.
   100% static, no external fonts/CDN (system font stack).
   ========================================================================= */

:root {
  /* Brand */
  --imvp-blue: #2563EB;
  --imvp-blue-dark: #1d4ed8;
  --imvp-blue-soft: #eff4ff;
  --imvp-blue-ring: rgba(37, 99, 235, .35);

  /* Ink & surfaces */
  --ink: #0f172a;          /* slate-900 */
  --ink-2: #334155;        /* slate-700 */
  --ink-3: #64748b;        /* slate-500 */
  --line: #e2e8f0;         /* slate-200 */
  --line-2: #eef2f7;
  --bg: #ffffff;
  --bg-2: #f8fafc;         /* slate-50 */
  --bg-3: #f1f5f9;

  /* Feedback */
  --warn: #b45309;
  --warn-bg: #fffbeb;
  --warn-line: #fde68a;
  --danger: #dc2626;

  /* Code block (soft dark) */
  --code-bg: #0f172a;
  --code-bg-2: #1e293b;
  --code-fg: #e2e8f0;
  --code-line: #334155;

  /* Metrics */
  --header-h: 60px;
  --sidebar-w: 268px;
  --content-max: 760px;
  --radius: 10px;
  --radius-sm: 7px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Noto Sans", sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", Menlo, monospace;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-md: 0 6px 24px rgba(15, 23, 42, .10);
  --shadow-pop: 0 12px 40px rgba(15, 23, 42, .16);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg-2);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- a11y helpers ---- */
.skip-link {
  position: fixed; top: -60px; left: 12px; z-index: 200;
  background: var(--imvp-blue); color: #fff; padding: 10px 16px;
  border-radius: 8px; text-decoration: none; font-weight: 600;
  transition: top .15s ease;
}
.skip-link:focus { top: 12px; }

:focus-visible {
  outline: 3px solid var(--imvp-blue-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

/* =========================================================================
   Header
   ========================================================================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  height: 100%;
  display: flex; align-items: center; gap: 16px;
  padding: 0 20px;
  max-width: 1440px; margin: 0 auto;
}

.brand {
  display: flex; align-items: center; gap: 9px;
  text-decoration: none; color: var(--ink);
  font-size: 17px; white-space: nowrap;
  flex-shrink: 0;
}
.brand-diamond { color: var(--imvp-blue); font-size: 18px; line-height: 1; }
.brand-text strong { font-weight: 800; letter-spacing: -.01em; }
.brand-sep { color: var(--ink-3); }
.brand-sub { color: var(--ink-2); font-weight: 600; }

/* Hamburger (mobile only) */
.nav-toggle {
  display: none;
  flex-direction: column; justify-content: center; gap: 4px;
  width: 38px; height: 38px; padding: 0 8px;
  background: transparent; border: 1px solid var(--line);
  border-radius: 8px; cursor: pointer;
}
.nav-toggle span {
  display: block; height: 2px; width: 100%;
  background: var(--ink-2); border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Search */
.header-search {
  position: relative;
  flex: 1 1 auto; max-width: 440px;
  margin-left: auto;
}
.search-icon {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  color: var(--ink-3); pointer-events: none;
}
.search-input {
  width: 100%; height: 38px;
  padding: 0 34px 0 34px;
  font: inherit; font-size: 14px; color: var(--ink);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 9px;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.search-input::placeholder { color: var(--ink-3); }
.search-input:focus {
  outline: none; background: #fff;
  border-color: var(--imvp-blue);
  box-shadow: 0 0 0 3px var(--imvp-blue-ring);
}
.search-kbd {
  position: absolute; right: 9px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-3); background: #fff;
  border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 5px; padding: 1px 6px; pointer-events: none;
}
.search-input:focus ~ .search-kbd { opacity: 0; }

.search-results {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: #fff; border: 1px solid var(--line);
  border-radius: 12px; box-shadow: var(--shadow-pop);
  max-height: min(60vh, 420px); overflow-y: auto;
  padding: 6px; z-index: 120;
}
.search-results:empty { display: none; }
.search-result {
  display: block; width: 100%; text-align: left;
  background: transparent; border: 0; cursor: pointer;
  padding: 9px 11px; border-radius: 8px;
  color: var(--ink); font: inherit;
}
.search-result:hover, .search-result.active {
  background: var(--imvp-blue-soft);
}
.search-result .sr-section {
  display: block; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .04em;
  color: var(--imvp-blue); margin-bottom: 2px;
}
.search-result .sr-title { font-weight: 600; font-size: 14px; }
.search-result .sr-snippet {
  display: block; font-size: 12.5px; color: var(--ink-3);
  margin-top: 2px; line-height: 1.45;
  overflow: hidden; text-overflow: ellipsis;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}
.search-result mark, .doc mark {
  background: #fde68a; color: inherit; border-radius: 3px; padding: 0 1px;
}
.search-empty { padding: 16px 12px; color: var(--ink-3); font-size: 14px; text-align: center; }

/* Lang toggle */
.lang-toggle {
  display: inline-flex; flex-shrink: 0;
  background: var(--bg-3); border: 1px solid var(--line);
  border-radius: 9px; padding: 2px;
}
.lang-btn {
  font: inherit; font-size: 12.5px; font-weight: 700;
  color: var(--ink-3); background: transparent;
  border: 0; cursor: pointer;
  padding: 5px 11px; border-radius: 7px;
  transition: color .15s ease, background .15s ease, box-shadow .15s ease;
}
.lang-btn[aria-pressed="true"] {
  color: var(--imvp-blue); background: #fff;
  box-shadow: var(--shadow-sm);
}

/* =========================================================================
   Layout
   ========================================================================= */
.layout {
  display: flex;
  max-width: 1440px; margin: 0 auto;
  align-items: flex-start;
}

.sidebar {
  position: sticky; top: var(--header-h);
  width: var(--sidebar-w); flex-shrink: 0;
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 22px 14px 60px;
  border-right: 1px solid var(--line);
  background: var(--bg);
}
.sidebar::-webkit-scrollbar { width: 9px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--line); border-radius: 9px; border: 2px solid var(--bg); }

.nav-loading { color: var(--ink-3); padding: 8px 12px; font-size: 14px; }

.nav-section { margin-bottom: 6px; }
.nav-section-title {
  font-size: 11.5px; font-weight: 800;
  text-transform: uppercase; letter-spacing: .055em;
  color: var(--ink-3);
  padding: 10px 12px 6px;
}
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-link {
  display: block; text-decoration: none;
  color: var(--ink-2); font-size: 14px; line-height: 1.4;
  padding: 7px 12px; border-radius: 8px;
  border-left: 2px solid transparent;
  transition: background .12s ease, color .12s ease;
}
.nav-link:hover { background: var(--bg-2); color: var(--ink); }
.nav-link.active {
  background: var(--imvp-blue-soft);
  color: var(--imvp-blue-dark);
  font-weight: 650;
  border-left-color: var(--imvp-blue);
}

/* =========================================================================
   Content
   ========================================================================= */
.content {
  flex: 1 1 auto; min-width: 0;
  padding: 40px clamp(20px, 5vw, 56px) 64px;
}
.doc { max-width: var(--content-max); margin: 0 auto; }

.doc-breadcrumb {
  font-size: 12.5px; font-weight: 600;
  color: var(--imvp-blue); text-transform: uppercase; letter-spacing: .04em;
  margin: 0 0 6px;
}

/* Typography */
.doc h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.05rem);
  line-height: 1.2; font-weight: 800; letter-spacing: -.02em;
  margin: 0 0 .6em; color: var(--ink);
}
.doc h3 {
  font-size: 1.3rem; font-weight: 750; letter-spacing: -.01em;
  margin: 2em 0 .55em; padding-top: .2em; color: var(--ink);
}
.doc h4 {
  font-size: 1.06rem; font-weight: 700;
  margin: 1.6em 0 .5em; color: var(--ink);
}
.doc p { margin: 0 0 1.05em; color: var(--ink-2); }
.doc strong { color: var(--ink); font-weight: 680; }
.doc em { font-style: italic; }

.doc a {
  color: var(--imvp-blue-dark);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 99, 235, .3);
  transition: border-color .12s ease, color .12s ease;
}
.doc a:hover { border-bottom-color: var(--imvp-blue); }

.doc ul, .doc ol { margin: 0 0 1.1em; padding-left: 1.4em; color: var(--ink-2); }
.doc li { margin: .35em 0; }
.doc li::marker { color: var(--ink-3); }

/* Inline code */
.doc :not(pre) > code {
  font-family: var(--font-mono); font-size: .87em;
  background: var(--bg-3); color: #b91c63;
  padding: .12em .4em; border-radius: 5px;
  border: 1px solid var(--line);
  word-break: break-word;
}
.doc a code { color: inherit; }

/* Code blocks */
.doc pre {
  position: relative;
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--code-line);
  border-radius: var(--radius);
  margin: 0 0 1.4em;
  padding: 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.doc pre code {
  display: block;
  font-family: var(--font-mono); font-size: 13.5px; line-height: 1.6;
  background: transparent; color: inherit; border: 0;
  padding: 16px 18px;
  overflow-x: auto;
  white-space: pre;
  tab-size: 2;
}
.doc pre code::-webkit-scrollbar { height: 9px; }
.doc pre code::-webkit-scrollbar-thumb { background: var(--code-line); border-radius: 9px; }

/* Copy button */
.copy-btn {
  position: absolute; top: 8px; right: 8px;
  font-family: var(--font-sans); font-size: 11.5px; font-weight: 600;
  color: var(--code-fg);
  background: var(--code-bg-2);
  border: 1px solid var(--code-line);
  border-radius: 7px; padding: 4px 10px;
  cursor: pointer; opacity: 0; transform: translateY(-2px);
  transition: opacity .14s ease, transform .14s ease, background .14s ease, color .14s ease;
}
.doc pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; transform: none; }
.copy-btn:hover { background: var(--imvp-blue); border-color: var(--imvp-blue); color: #fff; }
.copy-btn.copied { background: #16a34a; border-color: #16a34a; color: #fff; opacity: 1; }

/* light, sober syntax accents */
.doc pre .tok-comment { color: #94a3b8; font-style: italic; }
.doc pre .tok-flag { color: #7dd3fc; }
.doc pre .tok-str { color: #86efac; }
.doc pre .tok-cmd { color: #fcd34d; }

/* Blockquote / callout */
.doc blockquote {
  margin: 0 0 1.4em;
  padding: 14px 18px;
  background: var(--imvp-blue-soft);
  border: 1px solid #dbe6ff;
  border-left: 4px solid var(--imvp-blue);
  border-radius: var(--radius-sm);
  color: var(--ink-2);
}
.doc blockquote p { margin: 0 0 .6em; }
.doc blockquote p:last-child { margin-bottom: 0; }
.doc blockquote pre { margin-top: .8em; margin-bottom: 0; }
/* warning-flavoured callouts (heuristic: contains a strong "Avertissement"/"Warning") */
.doc blockquote.is-warn {
  background: var(--warn-bg); border-color: var(--warn-line);
  border-left-color: #d97706;
}
.doc blockquote.is-warn strong { color: var(--warn); }

/* Tables */
.doc table {
  width: 100%; border-collapse: collapse;
  margin: 0 0 1.5em; font-size: 14.5px;
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
.doc thead th {
  background: var(--bg-2); text-align: left;
  font-weight: 700; color: var(--ink);
  padding: 10px 14px; border-bottom: 1px solid var(--line);
}
.doc tbody td {
  padding: 9px 14px; border-bottom: 1px solid var(--line-2);
  color: var(--ink-2); vertical-align: top;
}
.doc tbody tr:last-child td { border-bottom: 0; }
.doc tbody tr:nth-child(even) { background: #fbfcfe; }
.table-wrap { overflow-x: auto; margin: 0 0 1.5em; }
.table-wrap table { margin: 0; }

/* kbd */
.doc kbd {
  font-family: var(--font-mono); font-size: .82em;
  color: var(--ink); background: #fff;
  border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 5px; padding: 1px 6px;
  box-shadow: var(--shadow-sm); white-space: nowrap;
}

/* hr */
.doc hr { border: 0; border-top: 1px solid var(--line); margin: 2.2em 0; }

/* =========================================================================
   Prev / next + footer + 404
   ========================================================================= */
.page-nav {
  max-width: var(--content-max); margin: 36px auto 0;
  display: flex; gap: 14px; justify-content: space-between;
}
.page-nav:empty { display: none; }
.page-nav a {
  flex: 1 1 0; min-width: 0;
  display: flex; flex-direction: column; gap: 2px;
  padding: 14px 16px; text-decoration: none;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; transition: border-color .14s ease, box-shadow .14s ease;
}
.page-nav a:hover { border-color: var(--imvp-blue); box-shadow: var(--shadow-sm); }
.page-nav a.next { text-align: right; align-items: flex-end; }
.page-nav .pn-label { font-size: 12px; color: var(--ink-3); font-weight: 600; }
.page-nav .pn-title { font-weight: 650; color: var(--imvp-blue-dark); font-size: 14.5px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 100%; }

.doc-footer {
  max-width: var(--content-max); margin: 48px auto 0;
  padding-top: 22px; border-top: 1px solid var(--line);
  color: var(--ink-3); font-size: 13px;
}
.doc-footer p { margin: 0 0 4px; }
.doc-footer code { font-family: var(--font-mono); }
.doc-footer-sub { font-size: 12px; }

.doc-404 { text-align: center; padding: 40px 0; }
.doc-404 .big { font-size: 3rem; font-weight: 800; color: var(--imvp-blue); margin: 0; }
.doc-404 a {
  display: inline-block; margin-top: 14px; padding: 10px 18px;
  background: var(--imvp-blue); color: #fff; border-radius: 9px;
  text-decoration: none; font-weight: 600; border: 0;
}
.doc-404 a:hover { background: var(--imvp-blue-dark); }

/* =========================================================================
   Responsive — sidebar becomes a drawer
   ========================================================================= */
.scrim {
  position: fixed; inset: var(--header-h) 0 0 0; z-index: 90;
  background: rgba(15, 23, 42, .42);
  opacity: 0; transition: opacity .2s ease;
}

@media (max-width: 920px) {
  .nav-toggle { display: flex; }
  .brand { margin-right: 0; }
  .search-kbd { display: none; }

  .sidebar {
    position: fixed; top: var(--header-h); left: 0; z-index: 95;
    width: min(82vw, 320px); height: calc(100vh - var(--header-h));
    transform: translateX(-102%);
    transition: transform .24s ease;
    box-shadow: var(--shadow-md);
    border-right: 1px solid var(--line);
  }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { display: block; opacity: 1; }
  body.nav-open { overflow: hidden; }

  .content { padding: 28px 18px 56px; }
}

@media (max-width: 560px) {
  .header-inner { gap: 10px; padding: 0 12px; }
  .brand-sub, .brand-sep { display: none; }
  .header-search { max-width: none; }
  .lang-toggle { padding: 1px; }
  .lang-btn { padding: 5px 8px; }
  .page-nav { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}