/* Knowledge Base — calm, typography-first UI
   Palette: warm cream background, deep navy text, muted accents.
   Serif for reading (Source Serif 4), sans for UI (Inter), mono for refs.
*/

:root {
  --bg: #f9f7f0;
  --bg-raised: #fffdf5;
  --bg-soft: #f2efe4;
  --ink: #1a2333;
  --ink-soft: #4a566b;
  --ink-quiet: #8a93a3;
  --line: #e2ddcd;
  --line-soft: #eeeadd;
  --accent: #003087;       /* Penske navy */
  --accent-soft: #f0c946;  /* warm gold, used sparingly */
  --success: #3a7a3a;
  --warn: #a66a0a;
  --chip-bg: #fffdf5;
  --chip-active: #003087;
  --chip-active-ink: #fffdf5;
  --mark-bg: #fff3c6;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --max: 72rem;
  --prose: 44rem;
  --shadow: 0 1px 2px rgba(26,35,51,.04), 0 1px 3px rgba(26,35,51,.03);
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171b23;
    --bg-raised: #1f242e;
    --bg-soft: #272d38;
    --ink: #e8e6df;
    --ink-soft: #aab0ba;
    --ink-quiet: #6b7280;
    --line: #2d333f;
    --line-soft: #252a33;
    --accent: #8da8e8;
    --accent-soft: #f0c946;
    --success: #6bb06b;
    --warn: #d9a03f;
    --chip-bg: #272d38;
    --chip-active: #8da8e8;
    --chip-active-ink: #121418;
    --mark-bg: #5a4a10;
  }
  .kb-body { color-scheme: dark; }
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }

.kb-quiet { color: var(--ink-quiet); }

/* Header */
.kb-header {
  background: var(--bg-raised);
  border-bottom: 1px solid var(--line);
}
.kb-header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.5rem;
  align-items: center;
}
.kb-brand {
  color: var(--ink);
  display: flex; flex-direction: column; line-height: 1.1;
}
.kb-brand:hover { text-decoration: none; }
.kb-brand-mark {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.kb-brand-sub {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-quiet);
  margin-top: 2px;
}
.kb-search input {
  width: 100%;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink);
  transition: border-color .15s, background .15s;
}
.kb-search input:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
}
.kb-nav {
  display: flex; align-items: center; gap: 1.25rem;
  font-size: 0.92rem;
}
.kb-nav a { color: var(--ink-soft); }
.kb-nav a:hover { color: var(--accent); text-decoration: none; }
.kb-who { color: var(--ink-soft); font-size: 0.85rem; }

/* Main */
.kb-main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  min-height: calc(100vh - 14rem);
}

/* Home hero */
.kb-hero {
  max-width: var(--prose);
  margin: 1rem 0 3rem;
}
.kb-hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}
.kb-hero p {
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin: 0;
  max-width: 40rem;
}

/* Category grid — calm, no giant stat cards */
.kb-cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}
.kb-cat-item {
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 0.4rem;
  color: var(--ink);
  transition: background .15s;
}
.kb-cat-item:hover { background: var(--bg-raised); text-decoration: none; }
.kb-cat-title {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
}
.kb-cat-sub { color: var(--ink-soft); font-size: 0.92rem; }
.kb-cat-count { color: var(--ink-quiet); font-size: 0.82rem; margin-top: 0.25rem; }

/* Browse: two-column layout */
.kb-layout {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: 3rem;
}
@media (max-width: 900px) {
  .kb-layout { grid-template-columns: 1fr; }
}
.kb-sidebar {
  position: sticky;
  top: 2rem;
  align-self: start;
  font-size: 0.94rem;
}
.kb-side-heading {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ink-quiet);
  margin: 0 0 0.5rem;
}
.kb-side-list {
  list-style: none;
  padding: 0; margin: 0 0 1.5rem;
}
.kb-side-list li { margin: 0; }
.kb-side-list a {
  display: block;
  padding: 0.35rem 0;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line-soft);
}
.kb-side-list a:hover { color: var(--accent); text-decoration: none; }
.kb-side-list a.active { color: var(--accent); font-weight: 500; }

/* Article list */
.kb-article-list {
  list-style: none;
  padding: 0; margin: 0;
}
.kb-article-list > li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}
.kb-article-list > li:last-child { border-bottom: none; }
.kb-article-list h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
}
.kb-article-list h3 a { color: var(--ink); }
.kb-article-list h3 a:hover { color: var(--accent); text-decoration: none; }
.kb-article-list .meta {
  font-size: 0.8rem;
  color: var(--ink-quiet);
  display: flex; gap: 0.9rem; flex-wrap: wrap;
  margin-bottom: 0.3rem;
}
.kb-article-list .excerpt { color: var(--ink-soft); font-size: 0.95rem; }

/* Section breadcrumb */
.kb-crumb {
  font-size: 0.85rem;
  color: var(--ink-quiet);
  margin-bottom: 0.5rem;
}
.kb-crumb a { color: var(--ink-soft); }
.kb-crumb a:hover { color: var(--accent); text-decoration: none; }

/* Article page (reading) */
.kb-article {
  max-width: var(--prose);
  margin: 0 auto;
}
.kb-article h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0.25rem 0 0.5rem;
}
.kb-article-meta {
  font-size: 0.85rem;
  color: var(--ink-quiet);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  display: flex; gap: 1rem; flex-wrap: wrap;
}
.kb-prose {
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.72;
  color: var(--ink);
}
.kb-prose h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.01em;
}
.kb-prose h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.5rem;
}
.kb-prose p { margin: 0 0 1.1rem; }
.kb-prose ul, .kb-prose ol { margin: 0 0 1.1rem 1.2rem; padding: 0; }
.kb-prose li { margin: 0.2rem 0; }
.kb-prose code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg-soft);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
.kb-prose pre {
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
}
.kb-prose pre code { background: transparent; padding: 0; }
.kb-prose blockquote {
  border-left: 3px solid var(--line);
  padding: 0.2rem 0 0.2rem 1rem;
  color: var(--ink-soft);
  margin: 1rem 0;
}
.kb-prose table {
  border-collapse: collapse;
  width: 100%;
  font-family: var(--sans);
  font-size: 0.92rem;
  margin: 1.5rem 0;
}
.kb-prose th, .kb-prose td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--line);
}
.kb-prose th { color: var(--ink-soft); font-weight: 600; border-bottom-color: var(--ink-quiet); }
.kb-prose hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

/* Inline PDF viewer */
.kb-pdf-section {
  margin: 2.5rem 0;
}
.kb-pdf-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 0.6rem;
  font-size: 0.88rem;
}
.kb-pdf-head a { color: var(--ink-soft); font-family: var(--sans); }
.kb-pdf-head a:hover { color: var(--accent); text-decoration: none; }
.kb-pdf-frame {
  width: 100%;
  height: 80vh;
  min-height: 40rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
}
.kb-pdf-frame iframe {
  width: 100%; height: 100%;
  border: 0; display: block;
}
@media (max-width: 900px) {
  .kb-pdf-frame { height: 70vh; min-height: 30rem; }
}

/* Attachments / source box */
.kb-source-box {
  margin: 2rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 0.9rem;
}
.kb-source-box h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-quiet);
  margin: 0 0 0.5rem;
  font-weight: 600;
}
.kb-source-box ul { list-style: none; padding: 0; margin: 0; }
.kb-source-box li { padding: 0.15rem 0; }

/* Search */
.kb-search-meta {
  color: var(--ink-quiet);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.kb-hit mark { background: var(--mark-bg); padding: 0 0.1em; border-radius: 2px; }
.kb-filters {
  display: flex; flex-direction: column; gap: 0.5rem;
  margin: 0 0 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}
.kb-filter-row {
  display: flex; align-items: center; flex-wrap: wrap; gap: 0.4rem;
}
.kb-filter-label {
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--ink-quiet); margin-right: 0.5rem; min-width: 4.5rem;
}
.kb-chip {
  padding: 0.25rem 0.65rem;
  font-size: 0.82rem;
  background: var(--chip-bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  transition: background .12s, border-color .12s, color .12s;
}
.kb-chip:hover { text-decoration: none; color: var(--ink); border-color: var(--ink-quiet); }
.kb-chip.active { background: var(--chip-active); color: var(--chip-active-ink); border-color: var(--chip-active); }
.kb-chip.active .kb-quiet { color: var(--chip-active-ink); opacity: 0.7; }

/* Article doc-control strip */
.kb-doc-control {
  display: flex; flex-wrap: wrap; gap: 0.9rem 1.5rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  margin: 0.5rem 0 1.5rem;
  font-family: var(--sans);
}
.kb-doc-control strong { color: var(--ink-quiet); font-weight: 500; text-transform: uppercase; font-size: 0.72rem; letter-spacing: 0.06em; margin-right: 0.35rem; }

/* Article prev/next */
.kb-prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 3rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
}
.kb-prev-next a {
  display: flex; flex-direction: column; gap: 0.15rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
}
.kb-prev-next a:hover { background: var(--bg-raised); text-decoration: none; border-color: var(--ink-quiet); }
.kb-prev-next .kb-quiet { font-size: 0.78rem; }
.kb-prev-next .kb-pn-title { font-weight: 500; font-size: 0.92rem; }

/* Footer */
.kb-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-raised);
  padding: 1.5rem 0;
  margin-top: 4rem;
}
.kb-footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex; justify-content: space-between; flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
  color: var(--ink-quiet);
}

/* Chat */
.kb-chat {
  max-width: var(--prose);
  margin: 0 auto;
}
.kb-chat-log {
  display: flex; flex-direction: column; gap: 1.25rem;
  margin: 1.5rem 0;
}
.kb-chat-msg {
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raised);
}
.kb-chat-msg.user { background: var(--bg-soft); border-color: var(--line-soft); }
.kb-chat-role {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-quiet);
  margin-bottom: 0.4rem;
  font-weight: 600;
}
.kb-chat-sources {
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line);
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.kb-chat-form {
  display: flex; gap: 0.5rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}
.kb-chat-form textarea {
  flex: 1;
  min-height: 3.5rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink);
  resize: vertical;
}
.kb-chat-form button {
  padding: 0 1.25rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
}
.kb-chat-form button:hover { background: #00206b; }
.kb-chat-empty { color: var(--ink-quiet); font-style: italic; text-align: center; padding: 2rem 0; }

/* Login */
.kb-login-wrap {
  max-width: 24rem;
  margin: 4rem auto;
  padding: 2.25rem 2rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.kb-login-wrap h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.5rem;
  margin: 0 0 0.25rem;
}
.kb-login-wrap p.sub {
  color: var(--ink-soft); font-size: 0.9rem; margin: 0 0 1.5rem;
}
.kb-field { margin-bottom: 1rem; }
.kb-field label {
  display: block; font-size: 0.82rem; color: var(--ink-soft);
  margin-bottom: 0.3rem; font-weight: 500;
}
.kb-field input {
  width: 100%; padding: 0.6rem 0.8rem;
  border: 1px solid var(--line); background: #fff;
  border-radius: var(--radius); font-family: var(--sans); font-size: 0.95rem;
}
.kb-field input:focus { outline: none; border-color: var(--accent); }
.kb-btn {
  display: inline-block;
  padding: 0.65rem 1.2rem;
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
  font-family: var(--sans); font-size: 0.9rem; font-weight: 500;
  border-radius: var(--radius); cursor: pointer;
  text-decoration: none;
}
.kb-btn:hover { background: #00206b; color: #fff; text-decoration: none; }
.kb-btn.ghost { background: transparent; color: var(--accent); }
.kb-btn.ghost:hover { background: var(--bg-soft); }
.kb-error {
  padding: 0.6rem 0.9rem; background: #fdecec; border: 1px solid #f3b9b9;
  color: #7a1d1d; border-radius: var(--radius); font-size: 0.88rem;
  margin-bottom: 1rem;
}

/* Admin tables */
.kb-admin-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.9rem;
}
.kb-admin-table th, .kb-admin-table td {
  text-align: left; padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--line);
}
.kb-admin-table th {
  color: var(--ink-quiet); font-weight: 600;
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em;
}
.kb-admin-table tr:hover td { background: var(--bg-raised); }

/* Utility */
.kb-mt-0 { margin-top: 0; }
.kb-mt-2 { margin-top: 2rem; }
.kb-text-center { text-align: center; }