/* ============================================================
   MRP for Aerospace & Defense — Documentation Site
   Enterprise visual system: persistent left nav, utility bar,
   global search, breadcrumbs, sticky TOC, dark mode, mobile
   drawer, print styles.
   ============================================================ */

:root {
  --bg: #f5f7fa;
  --bg-panel: #ffffff;
  --bg-soft: #eef1f6;
  --bg-code: #0f172a;
  --ink: #1a2233;
  --ink-soft: #4a5568;
  --ink-faint: #7a8699;
  --line: #dde3ec;
  --line-strong: #c6cedd;
  --brand: #14406b;
  --brand-2: #1c5f9e;
  --accent: #e8a33d;
  --accent-strong: #d98c1f;
  --ok: #1f8a5b;
  --ok-soft: #e3f5ec;
  --warn: #b45309;
  --warn-soft: #fdf0dc;
  --danger: #c03a3a;
  --danger-soft: #fbe7e7;
  --info: #1c5f9e;
  --info-soft: #e4eff9;
  --shadow: 0 1px 2px rgba(20, 40, 80, 0.06), 0 4px 16px rgba(20, 40, 80, 0.06);
  --shadow-lg: 0 8px 30px rgba(20, 40, 80, 0.14);
  --radius: 12px;
  --radius-sm: 8px;
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --nav-w: 276px;
  --toc-w: 264px;
  --header-h: 60px;
}

[data-theme="dark"] {
  --bg: #0d1520;
  --bg-panel: #131d2b;
  --bg-soft: #1a2536;
  --ink: #e6ecf5;
  --ink-soft: #b6c2d4;
  --ink-faint: #8592a8;
  --line: #243348;
  --line-strong: #33455f;
  --brand: #3f7fc4;
  --brand-2: #5a9ad8;
  --accent: #f0b75c;
  --accent-strong: #ffc97a;
  --ok: #4cc389;
  --ok-soft: #123a2a;
  --warn: #f0b75c;
  --warn-soft: #3a2c12;
  --danger: #ef6b6b;
  --danger-soft: #3a1c1c;
  --info: #6aa7e0;
  --info-soft: #14283f;
  --bg-code: #0a0f1a;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--bg-soft);
  padding: 0.15em 0.4em;
  border-radius: 5px;
  border: 1px solid var(--line);
}
pre {
  background: var(--bg-code);
  color: #dbe6f5;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  line-height: 1.55;
  font-size: 13.5px;
}
pre code { background: none; border: none; color: inherit; padding: 0; }
h1, h2, h3, h4 { line-height: 1.25; color: var(--ink); margin: 0 0 0.5em; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.45rem; margin-top: 2.2em; padding-bottom: 0.35em; border-bottom: 1px solid var(--line); }
h3 { font-size: 1.15rem; margin-top: 1.6em; }
h4 { font-size: 1rem; color: var(--ink-soft); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1.1em; padding-left: 1.4em; }
li { margin: 0.3em 0; }
img { max-width: 100%; height: auto; border-radius: var(--radius-sm); border: 1px solid var(--line); }
hr { border: none; border-top: 1px solid var(--line); margin: 2em 0; }
table { width: 100%; border-collapse: collapse; margin: 0 0 1.4em; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.6em 0.8em; border: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg-soft); font-weight: 600; }
tbody tr:nth-child(even) { background: var(--bg-soft); }
blockquote {
  margin: 1em 0; padding: 0.4em 1em;
  border-left: 4px solid var(--accent);
  background: var(--warn-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink);
}

.app-shell { display: grid; grid-template-columns: var(--nav-w) minmax(0,1fr); min-height: 100vh; }

.utility-bar {
  grid-column: 1 / -1;
  height: var(--header-h);
  display: flex; align-items: center; gap: 16px;
  padding: 0 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 40;
}
.brand-lockup { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 15px;
  flex: none;
}
.brand-title { font-weight: 700; font-size: 0.98rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.brand-sub { font-size: 0.72rem; color: var(--ink-faint); white-space: nowrap; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 6px 9px; cursor: pointer; color: var(--ink); font-size: 16px; }
.utility-spacer { flex: 1; }
.utility-actions { display: flex; align-items: center; gap: 8px; }
.utility-btn {
  background: var(--bg-soft); border: 1px solid var(--line); color: var(--ink);
  border-radius: 8px; padding: 7px 12px; font-size: 0.85rem; cursor: pointer; font-family: var(--font-sans);
}
.utility-btn:hover { border-color: var(--line-strong); }
.utility-btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.utility-btn.primary:hover { background: var(--brand-2); text-decoration: none; }

.search-wrap { position: relative; width: min(280px, 30vw); }
.search-wrap input {
  width: 100%; padding: 8px 12px 8px 34px;
  border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg-soft); color: var(--ink); font-family: var(--font-sans); font-size: 0.88rem;
}
.search-wrap input:focus { outline: 2px solid var(--brand-2); border-color: transparent; background: var(--bg-panel); }
.search-wrap .search-icon { position: absolute; left: 11px; top: 50%; transform: translateY(-50%); color: var(--ink-faint); font-size: 14px; pointer-events: none; }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: var(--bg-panel); border: 1px solid var(--line); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg); max-height: 360px; overflow: auto; z-index: 60; display: none;
}
.search-results.open { display: block; }
.search-results a { display: block; padding: 9px 12px; border-bottom: 1px solid var(--line); color: var(--ink); }
.search-results a:hover { background: var(--bg-soft); text-decoration: none; }
.search-results a .sr-title { font-weight: 600; font-size: 0.9rem; }
.search-results a .sr-ctx { font-size: 0.78rem; color: var(--ink-faint); }
.search-results .sr-empty { padding: 12px; color: var(--ink-faint); font-size: 0.85rem; }

.left-nav {
  background: var(--bg-panel);
  border-right: 1px solid var(--line);
  padding: 18px 12px 40px;
  position: sticky; top: var(--header-h); height: calc(100vh - var(--header-h));
  overflow-y: auto;
}
.nav-group { margin-bottom: 8px; }
.nav-group-title {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-faint); padding: 14px 10px 6px;
}
.nav-link {
  display: flex; align-items: center; gap: 9px;
  padding: 7px 10px; border-radius: 8px; color: var(--ink-soft);
  font-size: 0.9rem; margin: 1px 0;
}
.nav-link:hover { background: var(--bg-soft); color: var(--ink); text-decoration: none; }
.nav-link.active { background: var(--info-soft); color: var(--brand); font-weight: 600; }
.nav-link .nav-ico { width: 18px; text-align: center; font-size: 15px; flex: none; }

.content-wrap { max-width: 820px; margin: 0 auto; padding: 28px 40px 80px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 6px; font-size: 0.82rem; color: var(--ink-faint); margin-bottom: 18px; }
.breadcrumbs a { color: var(--ink-faint); }
.breadcrumbs .sep { color: var(--line-strong); }
.page-kicker { text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.75rem; font-weight: 700; color: var(--accent-strong); margin-bottom: 6px; }
.page-title { margin-bottom: 0.3em; }
.page-desc { color: var(--ink-soft); font-size: 1.05rem; margin-bottom: 1.6em; }
.lead { font-size: 1.08rem; color: var(--ink-soft); }

.page-grid { display: grid; grid-template-columns: minmax(0,1fr) var(--toc-w); gap: 40px; align-items: start; }
.inline-toc {
  position: sticky; top: calc(var(--header-h) + 20px);
  font-size: 0.84rem; max-height: calc(100vh - var(--header-h) - 40px); overflow-y: auto;
  padding-left: 4px;
}
.inline-toc .toc-title { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-faint); margin-bottom: 8px; }
.inline-toc a { display: block; padding: 4px 8px; color: var(--ink-soft); border-left: 2px solid var(--line); }
.inline-toc a:hover { color: var(--brand); border-color: var(--brand-2); text-decoration: none; }
.inline-toc a.lvl-2 { padding-left: 18px; }
.inline-toc a.active { color: var(--brand); border-color: var(--brand-2); font-weight: 600; }

.callout { display: flex; gap: 12px; padding: 14px 16px; border-radius: var(--radius-sm); margin: 1.2em 0; border: 1px solid var(--line); }
.callout .co-ico { font-size: 18px; flex: none; line-height: 1.4; }
.callout .co-body { font-size: 0.92rem; }
.callout .co-body strong { display: block; margin-bottom: 2px; }
.callout.info { background: var(--info-soft); border-color: transparent; }
.callout.warn { background: var(--warn-soft); border-color: transparent; }
.callout.danger { background: var(--danger-soft); border-color: transparent; }
.callout.ok { background: var(--ok-soft); border-color: transparent; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; margin: 1.4em 0; }
.card {
  background: var(--bg-panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.card .card-ico { font-size: 22px; margin-bottom: 8px; }
.card h3 { font-size: 1rem; margin-bottom: 6px; }
.card p { font-size: 0.87rem; color: var(--ink-soft); margin: 0; }
.card a { color: var(--ink); }
.card a:hover { text-decoration: none; }

.academy-card { border-left: 4px solid var(--brand-2); }
.lesson-row {
  display: flex; align-items: center; gap: 14px;
  padding: 13px 16px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  margin: 10px 0; background: var(--bg-panel);
}
.lesson-row .lesson-num { width: 30px; height: 30px; border-radius: 50%; background: var(--info-soft); color: var(--brand); display: grid; place-items: center; font-weight: 700; font-size: 0.85rem; flex: none; }
.lesson-row .lesson-info { flex: 1; }
.lesson-row .lesson-info h4 { margin: 0; font-size: 0.98rem; }
.lesson-row .lesson-info p { margin: 2px 0 0; font-size: 0.85rem; color: var(--ink-faint); }
.lesson-row .lesson-cta { font-size: 1.1rem; color: var(--ink-faint); }

.quiz { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 1.4em 0; }
.quiz-header { background: var(--bg-soft); padding: 12px 16px; font-weight: 700; font-size: 0.95rem; display: flex; justify-content: space-between; align-items: center; }
.quiz-body { padding: 16px; }
.quiz-q { margin-bottom: 16px; }
.quiz-q .q-text { font-weight: 600; margin-bottom: 8px; }
.quiz-q label { display: flex; gap: 8px; align-items: flex-start; padding: 6px 8px; border-radius: 6px; cursor: pointer; font-size: 0.92rem; }
.quiz-q label:hover { background: var(--bg-soft); }
.quiz-q input { margin-top: 3px; }
.quiz-q .q-feedback { display: none; margin-top: 6px; padding: 8px 10px; border-radius: 6px; font-size: 0.88rem; }
.quiz-q.correct .q-feedback { display: block; background: var(--ok-soft); color: var(--ok); }
.quiz-q.incorrect .q-feedback { display: block; background: var(--danger-soft); color: var(--danger); }
.quiz-actions { padding: 0 16px 16px; display: flex; gap: 10px; }
.quiz-actions button, button.btn {
  background: var(--brand); border: none; color: #fff; padding: 8px 16px; border-radius: 8px; cursor: pointer; font-family: var(--font-sans); font-size: 0.88rem;
}
.quiz-actions button:hover, button.btn:hover { background: var(--brand-2); }
button.btn.ghost { background: var(--bg-soft); color: var(--ink); border: 1px solid var(--line); }
button.btn.ghost:hover { background: var(--line); }

.progress-track { background: var(--bg-soft); border-radius: 20px; height: 10px; overflow: hidden; margin: 8px 0; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--brand), var(--brand-2)); width: 0%; transition: width 0.3s ease; }
.progress-label { font-size: 0.8rem; color: var(--ink-faint); }

.steps { counter-reset: step; list-style: none; padding-left: 0; margin: 1.2em 0; }
.steps > li { position: relative; padding: 0 0 1.2em 2.6em; counter-increment: step; }
.steps > li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--brand); color: #fff; font-weight: 700; font-size: 0.85rem;
  display: grid; place-items: center;
}
.steps > li > strong { display: block; margin-bottom: 2px; }

.figure { margin: 1.4em 0; }
.figure figcaption { font-size: 0.82rem; color: var(--ink-faint); margin-top: 8px; text-align: center; }
.screenshot-frame { border: 1px solid var(--line-strong); border-radius: var(--radius); overflow: hidden; background: var(--bg-panel); box-shadow: var(--shadow); }
.screenshot-frame .ss-top { display: flex; gap: 6px; padding: 10px 12px; background: var(--bg-soft); border-bottom: 1px solid var(--line); }
.screenshot-frame .ss-top i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.screenshot-frame .ss-top .r { background: #ff5f56; } .screenshot-frame .ss-top .y { background: #ffbd2e; } .screenshot-frame .ss-top .g { background: #27c93f; }
.screenshot-frame .ss-url { margin-left: 10px; font-size: 0.72rem; color: var(--ink-faint); }
.ss-placeholder { min-height: 170px; display: grid; place-items: center; text-align: center; background: linear-gradient(160deg, var(--bg-soft), var(--bg-panel)); color: var(--ink-faint); font-size: 0.85rem; padding: 24px; }
.ss-placeholder .ss-ico { font-size: 34px; margin-bottom: 8px; }
.screenshot-frame img.live { display: block; width: 100%; height: auto; border: none; border-radius: 0; }

.diagram { margin: 1.6em 0; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-panel); }
.diagram svg { width: 100%; height: auto; display: block; }

.tag { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 0.72rem; font-weight: 700; background: var(--info-soft); color: var(--brand); margin: 0 3px 3px 0; }
.tag.amber { background: var(--warn-soft); color: var(--warn); }
.tag.green { background: var(--ok-soft); color: var(--ok); }
.tag.red { background: var(--danger-soft); color: var(--danger); }
.tag.gray { background: var(--bg-soft); color: var(--ink-soft); }

.site-footer { border-top: 1px solid var(--line); padding: 28px 40px; color: var(--ink-faint); font-size: 0.85rem; background: var(--bg-panel); }
.site-footer .f-inner { max-width: 820px; margin: 0 auto; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

.muted { color: var(--ink-faint); }
.small { font-size: 0.85rem; }
.mt0 { margin-top: 0; }
.mb0 { margin-bottom: 0; }
.no-marker { list-style: none; padding-left: 0; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } .page-grid { grid-template-columns: 1fr; } .inline-toc { display: none; } }

.drawer-scrim { position: fixed; inset: 0; background: rgba(10,20,40,0.4); z-index: 70; display: none; }
.drawer-scrim.open { display: block; }
@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .utility-bar { padding: 0 12px; }
  .nav-toggle { display: inline-block; }
  .search-wrap { display: none; }
  .left-nav { position: fixed; top: 0; left: 0; bottom: 0; width: 280px; z-index: 80; height: 100vh; transform: translateX(-100%); transition: transform 0.22s ease; box-shadow: var(--shadow-lg); }
  .left-nav.open { transform: translateX(0); }
  .content-wrap { padding: 20px 18px 60px; }
  .site-footer { padding: 24px 18px; }
}

@media print {
  .left-nav, .utility-bar, .inline-toc, .drawer-scrim, .site-footer { display: none !important; }
  .app-shell { display: block; }
  .content-wrap { max-width: 100%; padding: 0; }
  body { background: #fff; }
  a { color: #000; }
  pre { white-space: pre-wrap; }
}