:root {
  --bg: #fafafa;
  --fg: #0f172a;
  --muted: #64748b;
  --subtle: #94a3b8;
  --accent: #475569;
  --accent-hover: #1e293b;
  --border: #e2e8f0;
  --bg-card: #fff;
  --bg-code: #f1f5f9;
}
* { box-sizing: border-box; }
html { font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif; -webkit-font-smoothing: antialiased; }
body { margin: 0; background: var(--bg); color: var(--fg); line-height: 1.55; }
code, pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
.container { max-width: 880px; margin: 0 auto; padding: 24px 20px 48px; }
header.site { padding-bottom: 14px; border-bottom: 1px solid var(--border); margin-bottom: 24px; }
header.site h1 { margin: 0 0 4px; font-size: 22px; font-weight: 600; letter-spacing: -0.01em; }
header.site h1 a { color: inherit; text-decoration: none; }
header.site .subtitle { color: var(--muted); font-size: 14px; }
header.site .subtitle code { background: var(--bg-code); padding: 1px 6px; border-radius: 3px; font-size: 12px; }
nav.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 16px; }
nav.crumbs a { color: var(--muted); text-decoration: none; border-bottom: 1px solid transparent; }
nav.crumbs a:hover { color: var(--accent); border-bottom-color: var(--accent); }
nav.crumbs .sep { margin: 0 6px; color: var(--subtle); }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; text-underline-offset: 3px; }
.stats { display: flex; flex-wrap: wrap; gap: 24px; padding: 14px 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; margin-bottom: 24px; font-size: 14px; }
.stat .num { display: block; font-weight: 600; font-size: 18px; color: var(--fg); }
.stat .lbl { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
form.search { display: flex; gap: 8px; margin-bottom: 28px; }
form.search input[type=search] { flex: 1; padding: 10px 14px; font-size: 15px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-card); color: var(--fg); }
form.search input[type=search]:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(71, 85, 105, 0.15); }
form.search select { padding: 10px 12px; font-size: 14px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-card); color: var(--fg); }
form.search button { padding: 10px 18px; font-size: 14px; font-weight: 500; background: var(--accent); color: white; border: 0; border-radius: 6px; cursor: pointer; }
form.search button:hover { background: var(--accent-hover); }
section.manufacturer { margin-bottom: 36px; padding-bottom: 4px; }
section.manufacturer:last-child { margin-bottom: 0; }
.mfr-heading { margin: 0 0 18px; padding: 0 0 8px; font-size: 20px; font-weight: 700; color: var(--fg); border-bottom: 1px solid var(--border); display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.mfr-meta { font-size: 12px; font-weight: 400; color: var(--muted); }

section.product { margin-bottom: 28px; }
section.product h2 { margin: 0 0 8px; font-size: 16px; font-weight: 600; color: var(--fg); }
section.product h2 .version { color: var(--muted); font-weight: 400; margin-left: 6px; font-size: 14px; }
section.product .meta { color: var(--muted); font-size: 13px; margin-bottom: 10px; }
.doc-category { margin-bottom: 14px; }
.doc-category:last-child { margin-bottom: 0; }
.category-heading { margin: 14px 0 6px; font-size: 11px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; display: flex; align-items: baseline; gap: 8px; }
.category-heading .category-count { font-weight: 400; color: var(--subtle); font-size: 11px; letter-spacing: 0; text-transform: none; }
ul.docs { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
ul.docs li a { display: flex; justify-content: space-between; align-items: baseline; padding: 8px 12px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px; }
ul.docs li a:hover { border-color: var(--accent); text-decoration: none; }
ul.docs .doc-name { font-weight: 500; color: var(--fg); }
ul.docs .chunk-count { color: var(--muted); font-size: 13px; }
/* Search-results chunk cards (compact, excerpt-style) */
article.chunk-card { padding: 14px 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; margin-bottom: 12px; }
article.chunk-card header { font-size: 13px; color: var(--muted); margin-bottom: 4px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
article.chunk-card h3 { margin: 4px 0 6px; font-size: 15px; font-weight: 600; }
article.chunk-card h3 a { color: var(--fg); }
article.chunk-card h3 a:hover { color: var(--accent); }
article.chunk-card .excerpt { color: var(--fg); font-size: 14px; margin: 4px 0 0; opacity: 0.8; }

/* Thumbnail-style card: SVG page render on the left, metadata on the right.
   Pages from PDF-derived docs use this; non-PDF docs fall back to the
   excerpt-style card above. */
article.chunk-card.has-thumbnail { display: grid; grid-template-columns: 160px 1fr; gap: 14px; align-items: start; }
.chunk-thumbnail { display: block; background: white; border: 1px solid var(--border); border-radius: 4px; overflow: hidden; line-height: 0; }
.chunk-thumbnail:hover { border-color: var(--accent); }
.chunk-thumbnail img { width: 100%; height: auto; max-height: 220px; object-fit: contain; display: block; background: white; }
article.chunk-card.has-thumbnail .card-body { min-width: 0; /* allow long header text to wrap */ }
article.chunk-card.has-thumbnail .card-meta { font-size: 13px; color: var(--muted); margin-top: 6px; }
@media (max-width: 600px) {
  article.chunk-card.has-thumbnail { grid-template-columns: 1fr; }
  .chunk-thumbnail img { max-height: 180px; }
}
.score { display: inline-flex; align-items: center; gap: 6px; font-variant-numeric: tabular-nums; color: var(--muted); font-size: 12px; }
.score-bar { display: inline-block; height: 4px; width: 56px; background: var(--bg-code); border-radius: 2px; overflow: hidden; }
.score-fill { display: block; height: 100%; background: var(--accent); }

/* Doc reader — the inline single-page view of all chunks in a doc */
.page-marker { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; font-weight: 600; padding: 14px 0 4px; border-top: 2px solid var(--border); margin: 28px 0 6px; display: flex; justify-content: space-between; align-items: baseline; }
.page-marker:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.page-marker a { color: var(--subtle); font-weight: 400; text-decoration: none; font-size: 11px; }
.page-marker a:hover { color: var(--accent); }

/* Chunk boundaries are scaffolding — hidden by default so the doc reads
   as continuous prose. The `Show chunk boundaries` toggle below reveals
   them on demand. Page markers stay visible regardless because they're
   navigational signal, not retrieval scaffolding. */
article.chunk { padding: 0; border-bottom: 0; margin-bottom: 8px; }
article.chunk:last-of-type { margin-bottom: 0; }
article.chunk .chunk-head { display: none; align-items: baseline; gap: 8px; margin-bottom: 4px; }
article.chunk .chunk-head h3 { margin: 0; font-size: 13px; font-weight: 600; color: var(--muted); text-transform: none; }
article.chunk .chunk-permalink { color: var(--subtle); font-size: 12px; text-decoration: none; }
article.chunk .chunk-permalink:hover { color: var(--accent); }
article.chunk:target { background: rgba(71, 85, 105, 0.08); border-radius: 4px; padding: 6px 8px; margin-left: -8px; margin-right: -8px; }

/* The toggle: pure-CSS click-to-show using checkbox + sibling combinator.
   No JS, no localStorage — state lives in the DOM. Checkbox itself is
   visually hidden but kept tab-focusable for keyboard users. */
.show-chunks-toggle { position: absolute; opacity: 0; pointer-events: none; }
.show-chunks-label { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); cursor: pointer; padding: 4px 10px; border: 1px solid var(--border); border-radius: 4px; background: var(--bg-card); user-select: none; margin-bottom: 18px; }
.show-chunks-label::before { content: '☐'; font-size: 13px; }
.show-chunks-toggle:checked + .show-chunks-label { color: var(--fg); border-color: var(--accent); }
.show-chunks-toggle:checked + .show-chunks-label::before { content: '☑'; }
.show-chunks-toggle:focus-visible + .show-chunks-label { outline: 2px solid var(--accent); outline-offset: 2px; }

/* When toggled on, restore the chunk scaffolding so a reader can see
   exactly which chunk would be cited where. */
.show-chunks-toggle:checked ~ .doc-content article.chunk { padding: 10px 0 14px; border-bottom: 1px dashed var(--border); margin-bottom: 0; }
.show-chunks-toggle:checked ~ .doc-content article.chunk:last-of-type { border-bottom: 0; }
.show-chunks-toggle:checked ~ .doc-content article.chunk .chunk-head { display: flex; }
.chunk-body { font-size: 15px; line-height: 1.6; color: var(--fg); }
.chunk-body > :first-child { margin-top: 0; }
.chunk-body > :last-child { margin-bottom: 0; }
.chunk-body p { margin: 0 0 8px; }
.chunk-body img { max-width: 100%; height: auto; border: 1px solid var(--border); border-radius: 4px; margin: 10px 0; display: block; background: var(--bg-card); }
.chunk-body table { border-collapse: collapse; margin: 12px 0; font-size: 13px; max-width: 100%; }
.chunk-body th, .chunk-body td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; vertical-align: top; }
.chunk-body th { background: var(--bg-code); font-weight: 600; }
.chunk-body code { background: var(--bg-code); padding: 1px 5px; border-radius: 3px; font-size: 13px; }
.chunk-body pre { background: var(--bg-code); padding: 12px 14px; border-radius: 4px; overflow-x: auto; font-size: 13px; line-height: 1.5; margin: 8px 0; white-space: pre-wrap; word-wrap: break-word; }
.chunk-body pre code { background: transparent; padding: 0; }
.chunk-body ul, .chunk-body ol { padding-left: 24px; margin: 4px 0 8px; }
.chunk-body li { margin-bottom: 2px; }
.chunk-body h4, .chunk-body h5, .chunk-body h6 { font-size: 14px; font-weight: 600; margin: 14px 0 4px; }
.chunk-body blockquote { margin: 8px 0; padding: 0 12px; border-left: 3px solid var(--border); color: var(--muted); }
.chunk-body a { color: var(--accent); }

/* Right-side fixed page nav (doc reader only, hidden on narrow screens) */
.page-nav { position: fixed; right: 16px; top: 24px; width: 130px; max-height: calc(100vh - 48px); overflow-y: auto; font-size: 12px; padding: 14px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }
.page-nav h4 { font-size: 11px; color: var(--muted); margin: 0 0 8px; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.page-nav .page-list { display: flex; flex-wrap: wrap; gap: 2px; }
.page-nav a { display: inline-block; padding: 3px 7px; color: var(--accent); text-decoration: none; border-radius: 3px; font-variant-numeric: tabular-nums; font-size: 11px; }
.page-nav a:hover { background: var(--bg-code); }
@media (max-width: 1180px) { .page-nav { display: none; } }

/* Prev/next pagination on /c/{chunk_id} */
.prev-next { display: flex; justify-content: space-between; gap: 12px; margin: 28px 0 16px; }
.prev-next a, .prev-next .placeholder { flex: 1 1 0; padding: 10px 14px; border-radius: 6px; text-decoration: none; font-size: 13px; }
.prev-next a { background: var(--bg-card); border: 1px solid var(--border); color: var(--fg); display: flex; flex-direction: column; gap: 2px; }
.prev-next a:hover { border-color: var(--accent); text-decoration: none; }
.prev-next .placeholder { visibility: hidden; }
.prev-next .label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.prev-next .target { font-weight: 500; }
.prev-next .next { text-align: right; align-items: flex-end; }
.in-context { display: inline-flex; align-items: center; gap: 6px; margin: 0 0 16px; padding: 6px 12px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px; font-size: 13px; text-decoration: none; }
.in-context:hover { border-color: var(--accent); text-decoration: none; }

.chunk-meta { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.chunk-meta dl { margin: 0; }
.chunk-meta dt { display: inline; font-weight: 600; }
.chunk-meta dd { display: inline; margin: 0 18px 0 4px; }
.chunk-meta code { background: var(--bg-code); padding: 1px 5px; border-radius: 3px; font-size: 12px; color: var(--fg); }
footer.site { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12px; }
.empty { padding: 32px 24px; text-align: center; color: var(--muted); background: var(--bg-card); border: 1px dashed var(--border); border-radius: 6px; }
.results-meta { color: var(--muted); font-size: 13px; margin-bottom: 16px; }

/* Admin upload form — same neutral palette as the rest, slightly more
   spacing because forms benefit from breathing room. */
.admin-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; padding: 18px 20px; margin-bottom: 18px; }
.admin-form .form-row { margin-bottom: 14px; }
.admin-form .form-row:last-child { margin-bottom: 0; }
.admin-form label { display: block; font-size: 13px; font-weight: 600; color: var(--fg); margin-bottom: 4px; }
.admin-form .hint { font-weight: 400; color: var(--muted); margin-left: 6px; font-size: 12px; }
.admin-form input[type=url], .admin-form input[type=text], .admin-form input[type=file] { width: 100%; padding: 8px 12px; font-size: 14px; border: 1px solid var(--border); border-radius: 4px; background: var(--bg); color: var(--fg); font-family: inherit; box-sizing: border-box; }
.admin-form input[type=url]:focus, .admin-form input[type=text]:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(71, 85, 105, 0.15); }
.admin-form .form-row-grid { display: grid; grid-template-columns: 1fr 1fr 2fr; gap: 12px; }
.admin-form button, button.btn-secondary { padding: 9px 18px; font-size: 14px; font-weight: 500; background: var(--accent); color: white; border: 0; border-radius: 5px; cursor: pointer; }
.admin-form button:hover, button.btn-secondary:hover { background: var(--accent-hover); }
button.btn-secondary { background: var(--bg-card); color: var(--fg); border: 1px solid var(--border); }
button.btn-secondary:hover { border-color: var(--accent); background: var(--bg-card); color: var(--accent); }

table.admin-jobs { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 8px; }
table.admin-jobs th { text-align: left; padding: 8px 10px; background: var(--bg-code); font-weight: 600; color: var(--muted); border-bottom: 1px solid var(--border); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; }
table.admin-jobs td { padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.admin-jobs td.job-msg { color: var(--muted); font-size: 12px; max-width: 400px; }
.job-status { font-size: 11px; padding: 2px 8px; border-radius: 3px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.job-running { background: rgba(71, 85, 105, 0.15); color: var(--accent); }
.job-ok { background: rgba(34, 139, 34, 0.15); color: #228b22; }
.job-failed { background: rgba(180, 50, 50, 0.15); color: #b43232; }

@media (max-width: 600px) {
  .admin-form .form-row-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .container { padding: 16px 14px 32px; }
  .stats { gap: 16px; }
  form.search { flex-direction: column; }
  form.search button { width: 100%; }
  ul.docs li a { flex-direction: column; align-items: flex-start; gap: 2px; }
}