/* layout.css — Atlassian-style: persistent sidebar + main content, mobile drawer */

body {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-areas: "sidebar content";
  min-height: 100vh;
  min-height: 100dvh;
}

/* ── Sidebar — STICKY HEADER (logo + search), scrolling nav tree ────────── */
.sidebar {
  grid-area: sidebar;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;  /* scroll moves to .nav-tree, not whole sidebar */
  z-index: var(--z-sidebar);
}

.sidebar-header {
  padding: var(--sp-5) var(--sp-5) var(--sp-4);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--sidebar-bg);
  position: relative;
  z-index: 2;
}

.logo {
  display: block;
  color: var(--text);
  text-decoration: none;
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.88; text-decoration: none; }
.logo-svg {
  width: 100%;
  max-width: 180px;
  height: auto;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 1px 2px rgba(9, 30, 66, 0.08));
}

/* Search container — STICKY just below logo */
.sidebar-search {
  padding: var(--sp-3) var(--sp-5) var(--sp-4);
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.search-trigger {
  display: flex; align-items: center; gap: var(--sp-2);
  width: 100%;
  padding: var(--sp-2) var(--sp-3);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: var(--text-sm);
  text-align: left;
  transition: all var(--transition-fast);
}
.search-trigger:hover { border-color: var(--border-strong); background: white; box-shadow: var(--shadow-sm); }
.search-trigger:focus-visible { border-color: var(--tm-blue); }
.search-trigger svg { color: var(--text-muted); flex-shrink: 0; }
.search-trigger > span { flex: 1; }
.search-trigger kbd { flex-shrink: 0; }

/* Nav tree — THIS is the scrolling area now */
.nav-tree {
  padding: var(--sp-2) var(--sp-3) var(--sp-4);
  flex: 1 1 auto;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  /* Subtle inset shadow indicates scroll area */
  background:
    linear-gradient(var(--sidebar-bg) 30%, transparent),
    linear-gradient(transparent, var(--sidebar-bg) 70%) 0 100%,
    radial-gradient(at top, rgba(9, 30, 66, 0.06), transparent 70%),
    radial-gradient(at bottom, rgba(9, 30, 66, 0.06), transparent 70%) 0 100%;
  background-repeat: no-repeat;
  background-size: 100% 32px, 100% 32px, 100% 8px, 100% 8px;
  background-attachment: local, local, scroll, scroll;
}
.nav-tree::-webkit-scrollbar { width: 6px; }
.nav-tree::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }

/* Nav separator — divides primary from secondary tabs */
.nav-separator {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border) 20%, var(--border) 80%, transparent);
  margin: var(--sp-4) var(--sp-3);
  list-style: none;
  position: relative;
}
.nav-separator::after {
  content: "DESPRE";
  position: absolute;
  top: -7px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--sidebar-bg);
  padding: 0 var(--sp-2);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}

/* Secondary tabs — visually deprioritized */
.nav-section-secondary > .nav-section-toggle {
  opacity: 0.7;
  font-size: var(--text-xs);
}
.nav-section-secondary > .nav-section-toggle .nav-icon { opacity: 0.6; }
.nav-section-secondary > .nav-section-toggle:hover { opacity: 1; }

.nav-root { list-style: none; display: flex; flex-direction: column; gap: var(--sp-1); }

.nav-section { display: flex; flex-direction: column; }

.nav-section-toggle {
  display: flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  width: 100%;
  text-align: left;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-section-toggle:hover { background: var(--accent-soft); color: var(--text); }

.nav-icon {
  display: grid; place-items: center;
  width: 22px; height: 22px;
  font-size: 0.7rem;
  color: var(--tm-maroon);
  flex-shrink: 0;
  opacity: 0.8;
}
.nav-label { flex: 1; }
.nav-chevron {
  font-size: 1.1em;
  color: var(--text-muted);
  transition: transform var(--transition);
  display: inline-block;
}
.nav-section.open > .nav-section-toggle .nav-chevron { transform: rotate(90deg); }

.nav-group-wrap {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition);
}
.nav-section.open > .nav-group-wrap { grid-template-rows: 1fr; }
.nav-group-inner {
  min-height: 0;
  overflow: hidden;
}

.nav-group-label {
  padding: var(--sp-3) var(--sp-3) var(--sp-1) calc(22px + var(--sp-2) + var(--sp-3));
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}

.nav-pages { list-style: none; display: flex; flex-direction: column; }

.nav-page {
  display: block;
  padding: var(--sp-2) var(--sp-3) var(--sp-2) calc(22px + var(--sp-2) + var(--sp-3));
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius);
  border-left: 3px solid transparent;
  margin-left: var(--sp-2);
  line-height: 1.4;
  transition: all var(--transition-fast);
}
.nav-page:hover { background: var(--accent-soft); color: var(--text); text-decoration: none; }
.nav-page.active {
  background: var(--accent-soft);
  color: var(--tm-maroon);
  border-left-color: var(--tm-maroon);
  font-weight: 500;
}

/* ── Nav pathway: pagină-părinte cu sub-pagini colapsabile, oricât de adânc ── */
.nav-pathway { display: flex; flex-direction: column; }
.nav-pathway-row {
  display: flex;
  align-items: stretch;
  gap: 2px;
}
.nav-pathway-link { flex: 1; min-width: 0; }
.nav-pathway-toggle {
  display: inline-grid;
  place-items: center;
  width: 24px;
  margin: 0 var(--sp-2) 0 0;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-pathway-toggle:hover {
  background: var(--accent-soft);
  color: var(--tm-maroon);
}
.nav-pathway-toggle .nav-chevron {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition-fast);
}
.nav-pathway.open > .nav-pathway-row > .nav-pathway-toggle .nav-chevron {
  transform: rotate(90deg);
}

/* Colaps: același pattern ca .nav-section (grid-template-rows trick) */
.nav-subpages-wrap {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition);
}
.nav-pathway.open > .nav-subpages-wrap { grid-template-rows: 1fr; }
.nav-subpages-inner {
  overflow: hidden;
  min-height: 0;
}
.nav-subpages {
  list-style: none;
  margin: 2px 0 var(--sp-2);
  padding: 0;
  display: flex;
  flex-direction: column;
  /* Indent recursiv: 8px per nivel — subtil ca în VS Code / Notion.
     Orice .nav-subpages cuibărit într-altă primește indent adițional automat,
     ceea ce produce o ierarhie vizuală pe N niveluri fără ca textul să se
     sufoce la adâncimi mari. */
  padding-left: var(--sp-2);
}

/* Sub-pagină — VIZUAL SUBORDONATĂ, fără conotații de header
   (font mai mic, culoare mai stinsă, fără bold pe activ) */
.nav-subpage {
  display: block;
  padding: 4px var(--sp-3) 4px calc(22px + var(--sp-2) + var(--sp-3));
  font-size: var(--text-xs);
  color: var(--text-muted);
  border-radius: var(--radius);
  border-left: 2px solid transparent;
  margin-left: var(--sp-1);
  line-height: 1.4;
  transition: all var(--transition-fast);
  font-weight: normal;
}
.nav-subpage:hover {
  background: var(--accent-soft);
  color: var(--text-secondary);
  text-decoration: none;
}
.nav-subpage.active {
  background: var(--accent-soft);
  color: var(--tm-maroon);
  border-left-color: var(--tm-maroon);
  /* Nu îngroșăm — păstrăm vizual subordonat */
}

.nav-pdf-cta {
  margin: var(--sp-5) var(--sp-2) var(--sp-3);
  padding: var(--sp-3);
  border-top: 1px dashed var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  align-items: center;
  text-align: center;
}
.sf-pdf {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  background: var(--accent-soft);
  color: var(--tm-maroon);
  border-radius: var(--radius);
  font-size: var(--text-xs);
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
}
.sf-pdf:hover {
  background: var(--tm-maroon);
  color: white;
  text-decoration: none;
}
.sf-version { font-size: 0.65rem; color: var(--text-muted); opacity: 0.7; }

/* ── Menu toggle (mobile hamburger) ──────────────────────────────────────── */
.menu-toggle {
  display: none;
  position: fixed;
  top: var(--sp-3);
  left: var(--sp-3);
  width: 44px;
  height: 44px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  z-index: var(--z-toggle);
  align-items: center;
  justify-content: center;
  transition: left var(--transition), background var(--transition-fast);
}
/* When drawer is open, slide the toggle to the right edge of the sidebar
   so it acts as a visible close button (Atlassian / Material pattern). */
body.nav-open .menu-toggle {
  inset-inline-start: calc(min(85vw, 320px) - 44px - var(--sp-3));
}
.hamburger, .hamburger::before, .hamburger::after {
  content: ""; display: block;
  width: 18px; height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger { position: relative; }
.hamburger::before { position: absolute; top: -6px; left: 0; }
.hamburger::after { position: absolute; top: 6px; left: 0; }
.menu-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.menu-toggle[aria-expanded="true"] .hamburger::before { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .hamburger::after { transform: translateY(-6px) rotate(-45deg); }

/* Backdrop for mobile drawer */
.backdrop {
  position: fixed; inset: 0;
  background: rgba(9, 30, 66, 0.5);
  z-index: var(--z-backdrop);
  opacity: 0;
  transition: opacity var(--transition);
}
.backdrop[hidden] { display: none; }
.backdrop.visible { opacity: 1; }

/* ── Content area ─────────────────────────────────────────────────────────── */
.content {
  grid-area: content;
  padding: var(--sp-7) var(--sp-7) var(--sp-12);
  max-width: calc(var(--content-max) + var(--sp-7) * 2);
  margin: 0 auto;
  width: 100%;
}

.content-header { margin-bottom: var(--sp-5); }

.breadcrumbs {
  font-size: var(--text-sm);
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
}
.breadcrumbs a { color: var(--text-secondary); }
.breadcrumbs a:hover { color: var(--link); }
.bc-sep { color: var(--border-strong); }
.bc-current { color: var(--text); font-weight: 500; }

.content-article { min-height: 60vh; }

.content-footer {
  margin-top: var(--sp-10);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--border);
}

.page-footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
  margin-bottom: var(--sp-5);
}
.page-footer-nav > a {
  display: block;
  padding: var(--sp-4) var(--sp-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: all var(--transition);
  color: var(--text);
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
}
.page-footer-nav > a:hover {
  border-color: var(--tm-maroon);
  background: var(--accent-soft);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.pn-prev { text-align: left; }
.pn-next { text-align: right; }
.pn-prev span, .pn-next span { display: block; font-weight: 500; margin-top: 2px; color: var(--text); }

.content-edit {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--sp-5);
}
.content-edit code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-subtle);
  padding: 1px 4px;
  border-radius: var(--radius-sm);
}

/* ── CSR footer — subtle attribution to host sponsor ──────────────────────── */
.site-footer-csr {
  margin-top: var(--sp-8);
  padding: var(--sp-4) var(--sp-5);
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  opacity: 0.85;
}
.site-footer-csr p { margin: 0; }
.site-footer-csr strong { color: var(--tm-maroon); font-weight: 600; }
.site-footer-csr a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px dotted var(--border-strong);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.site-footer-csr a:hover {
  color: var(--tm-maroon);
  border-bottom-color: var(--tm-maroon);
}

/* ── Responsive: Tablet (1024px and down) ───────────────────────────────── */
@media (max-width: 1024px) {
  :root { --sidebar-w: var(--sidebar-w-md); }
  .content { padding: var(--sp-6) var(--sp-5) var(--sp-10); }
}

/* ── Responsive: Mobile (768px and down) ────────────────────────────────── */
@media (max-width: 768px) {
  body { grid-template-columns: 1fr; grid-template-areas: "content"; }

  .menu-toggle { display: flex; }

  .sidebar {
    position: fixed;
    top: 0; left: 0;
    width: min(85vw, 320px);
    transform: translateX(-100%);
    transition: transform var(--transition);
    box-shadow: var(--shadow-lg);
  }
  body.nav-open .sidebar { transform: translateX(0); }

  .content {
    padding: calc(var(--sp-12) + var(--sp-4)) var(--sp-4) var(--sp-10);
  }

  .page-footer-nav { grid-template-columns: 1fr; }
}

/* ── Responsive: Small mobile (480px) ───────────────────────────────────── */
@media (max-width: 480px) {
  .content { padding-left: var(--sp-3); padding-right: var(--sp-3); }
  .sidebar-header { padding: var(--sp-4); }
  .search-trigger { margin: var(--sp-3) var(--sp-4); }
  .nav-tree { padding: var(--sp-2); }
}

/* ── Lock body scroll when nav open on mobile ───────────────────────────── */
body.nav-open { overflow: hidden; }

/* ── Back-to-top button (auto-injected on long pages by nav.js) ─────────── */
.back-to-top {
  position: fixed;
  bottom: var(--sp-5);
  right: var(--sp-5);
  width: 44px;
  height: 44px;
  background: var(--tm-maroon);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.3rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  z-index: var(--z-overlay);
  transition: all var(--transition), opacity var(--transition);
  display: grid;
  place-items: center;
  opacity: 0.92;
}
.back-to-top[hidden] {
  display: none;
}
.back-to-top:hover {
  opacity: 1;
  transform: translateY(-2px);
  background: var(--tm-maroon-dark);
}
.back-to-top:focus-visible {
  outline: none;
  box-shadow: var(--shadow-lg), var(--focus-ring);
}
@media (max-width: 480px) {
  .back-to-top {
    bottom: var(--sp-3);
    right: var(--sp-3);
    width: 40px;
    height: 40px;
  }
}