/* ============================================
   nonprofits.club Knowledge Base — Dark Theme
   Requires: theme.css loaded first
   ============================================ */

/* --- Dark-Mode Body --- */
body {
  background: linear-gradient(135deg, var(--nc-navy) 0%, var(--nc-midnight) 100%);
  color: var(--nc-text);
  min-height: 100vh;
}

*, *::before, *::after { box-sizing: border-box; }

a { color: var(--nc-teal-light); text-decoration: none; transition: var(--nc-transition); }
a:hover { color: var(--nc-coral); }

::selection { background: rgba(0, 212, 170, 0.3); color: #fff; }

/* --- Navigation --- */
.kb-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--nc-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--nc-card-border);
  padding: 0 1.5rem;
  transition: var(--nc-transition);
}
.kb-nav.scrolled {
  background: rgba(10, 15, 30, 0.95);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--nc-text);
}
.nav-logo img { width: 32px; height: 32px; border-radius: 6px; }
.nav-logo span {
  background: linear-gradient(135deg, var(--nc-teal-light), var(--nc-coral));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-search {
  flex: 1;
  max-width: 420px;
  margin: 0 2rem;
  position: relative;
}
.nav-search input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.5rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--nc-card-border);
  border-radius: 8px;
  color: var(--nc-text);
  font-size: 0.875rem;
  outline: none;
  transition: var(--nc-transition);
}
.nav-search input::placeholder { color: var(--nc-text-tertiary); }
.nav-search input:focus {
  border-color: var(--nc-teal-light);
  background: rgba(255,255,255,0.1);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.15);
}
.nav-search::before {
  content: "\1F50D";
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.85rem;
  opacity: 0.5;
}
.nav-links { display: flex; gap: 1.5rem; align-items: center; }
.nav-links a {
  color: var(--nc-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--nc-text);
  border-bottom-color: var(--nc-teal-light);
}
.nav-cta {
  padding: 0.4rem 1rem !important;
  background: linear-gradient(135deg, var(--nc-coral), #ff8a6a) !important;
  border-radius: 6px !important;
  color: #fff !important;
  border-bottom: none !important;
  font-weight: 600 !important;
}
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

/* Search Results Dropdown */
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
  background: rgba(13, 27, 62, 0.98);
  backdrop-filter: blur(20px);
  border: 1px solid var(--nc-card-border);
  border-radius: var(--nc-radius);
  max-height: 420px;
  overflow-y: auto;
  display: none;
  z-index: 100;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.search-results.active { display: block; }
.search-result-item {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  cursor: pointer;
  transition: var(--nc-transition);
}
.search-result-item:hover { background: rgba(255,255,255,0.05); }
.search-result-item:last-child { border-bottom: none; }
.search-result-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
  color: var(--nc-text);
}
.search-result-item p {
  font-size: 0.8rem;
  color: var(--nc-text-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-result-item .sr-pillar {
  display: inline-block;
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  background: rgba(0, 212, 170, 0.15);
  color: var(--nc-teal-light);
  border-radius: 4px;
  margin-top: 0.35rem;
  font-weight: 500;
}
.search-no-results {
  padding: 1.5rem;
  text-align: center;
  color: var(--nc-text-tertiary);
  font-size: 0.875rem;
}

/* --- Hero Section (Landing) --- */
.kb-hero {
  padding: 8rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.kb-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(0, 212, 170, 0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
  z-index: 0;
}
.kb-hero > * { position: relative; z-index: 1; }
.kb-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #fff 0%, var(--nc-teal-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.kb-hero .subtitle {
  font-size: 1.15rem;
  color: var(--nc-text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}
.hero-search {
  max-width: 560px;
  margin: 0 auto 2.5rem;
  position: relative;
}
.hero-search input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--nc-card-border);
  border-radius: var(--nc-radius);
  color: var(--nc-text);
  font-size: 1rem;
  outline: none;
  transition: var(--nc-transition);
}
.hero-search input:focus {
  border-color: var(--nc-teal-light);
  box-shadow: 0 0 0 4px rgba(0, 212, 170, 0.12);
  background: rgba(255,255,255,0.1);
}
.hero-search::before {
  content: "\1F50D";
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  opacity: 0.5;
  z-index: 2;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
}
.hero-stat .number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--nc-coral), var(--nc-teal-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label {
  font-size: 0.85rem;
  color: var(--nc-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Section Headings --- */
.section-heading {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--nc-card-border);
}

/* --- Pillar Cards --- */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.pillar-card {
  background: var(--nc-card-bg);
  border: 1px solid var(--nc-card-border);
  border-radius: var(--nc-radius);
  padding: 1.5rem;
  transition: var(--nc-transition);
  display: flex;
  flex-direction: column;
}
.pillar-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 170, 0.3);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.pillar-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1rem;
  background: rgba(0, 212, 170, 0.1);
}
.pillar-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--nc-text);
}
.pillar-card p {
  font-size: 0.85rem;
  color: var(--nc-text-secondary);
  flex: 1;
  margin-bottom: 0.75rem;
}
.pillar-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}
.pillar-count {
  font-size: 0.75rem;
  color: var(--nc-text-tertiary);
  font-weight: 500;
}
.pillar-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--nc-teal-light);
}
.pillar-link:hover { color: var(--nc-coral); }

/* --- Post Cards (Featured / Recent) --- */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.post-card {
  background: var(--nc-card-bg);
  border: 1px solid var(--nc-card-border);
  border-radius: var(--nc-radius);
  overflow: hidden;
  transition: var(--nc-transition);
}
.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.post-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.post-card-body { padding: 1.25rem; }
.post-card-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}
.post-card-body h3 a { color: var(--nc-text); }
.post-card-body h3 a:hover { color: var(--nc-teal-light); }
.post-card-body p {
  font-size: 0.85rem;
  color: var(--nc-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  font-size: 0.75rem;
}

/* --- Pillar Badge --- */
.pillar-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: rgba(0, 212, 170, 0.12);
  color: var(--nc-teal-light);
}
.pillar-badge.coral { background: rgba(255, 107, 74, 0.12); color: var(--nc-coral); }
.pillar-badge.purple { background: rgba(139, 92, 246, 0.12); color: var(--nc-purple); }

/* --- CTA Section --- */
.kb-cta {
  text-align: center;
  padding: 4rem 2rem;
  margin: 4rem 0 0;
  background: linear-gradient(135deg, rgba(0, 212, 170, 0.06), rgba(139, 92, 246, 0.06));
  border-radius: var(--nc-radius);
  border: 1px solid var(--nc-card-border);
}
.kb-cta h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 0.5rem; }
.kb-cta p { color: var(--nc-text-secondary); margin-bottom: 1.5rem; }

/* ==============================
   BLOG POST STYLES
   ============================== */

/* Post Hero */
.post-hero-img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--nc-radius);
  margin-bottom: 2rem;
}

/* Post Header */
.post-header { margin-bottom: 2.5rem; padding-top: 5.5rem; }
.post-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0.75rem 0;
}
.post-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.82rem;
  color: var(--nc-text-tertiary);
  margin-top: 0.75rem;
}
.post-meta-bar span { display: flex; align-items: center; gap: 0.3rem; }

/* Breadcrumbs */
.breadcrumb-nav {
  padding-top: 5rem;
  margin-bottom: 1rem;
}
.breadcrumb {
  background: transparent;
  padding: 0;
  margin: 0;
  font-size: 0.8rem;
}
.breadcrumb-item + .breadcrumb-item::before {
  content: "\203A";
  color: var(--nc-text-tertiary);
}
.breadcrumb-item a { color: var(--nc-text-secondary); }
.breadcrumb-item.active { color: var(--nc-text-tertiary); }

/* Post Content */
.post-content {
  max-width: 760px;
  font-size: 1.05rem;
  line-height: 1.8;
}
.post-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--nc-card-border);
  color: var(--nc-text);
}
.post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--nc-text);
}
.post-content p { margin-bottom: 1.25rem; color: rgba(240, 244, 248, 0.9); }
.post-content ul, .post-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}
.post-content li {
  margin-bottom: 0.5rem;
  color: rgba(240, 244, 248, 0.85);
}
.post-content strong { color: var(--nc-text); font-weight: 600; }
.post-content blockquote {
  border-left: 3px solid var(--nc-teal-light);
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background: rgba(0, 212, 170, 0.04);
  border-radius: 0 8px 8px 0;
  color: var(--nc-text-secondary);
  font-style: italic;
}
.post-content table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.post-content th {
  background: rgba(0, 212, 170, 0.08);
  color: var(--nc-teal-light);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--nc-card-border);
}
.post-content td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--nc-card-border);
  color: var(--nc-text-secondary);
}
.post-content tr:hover td { background: rgba(255,255,255,0.02); }

/* Callout Boxes */
.callout {
  padding: 1.25rem 1.5rem;
  border-radius: var(--nc-radius);
  margin: 1.5rem 0;
  border-left: 4px solid;
}
.callout-tip { background: rgba(0, 212, 170, 0.06); border-color: var(--nc-teal-light); }
.callout-warning { background: rgba(255, 107, 74, 0.06); border-color: var(--nc-coral); }
.callout-info { background: rgba(139, 92, 246, 0.06); border-color: var(--nc-purple); }
.callout-title { font-weight: 700; margin-bottom: 0.35rem; font-size: 0.9rem; }

/* Table of Contents (Sticky Sidebar) */
.toc-sidebar {
  position: sticky;
  top: 80px;
}
.toc-sidebar h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--nc-text-tertiary);
  margin-bottom: 0.75rem;
  font-weight: 600;
}
.toc-sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc-sidebar li {
  margin-bottom: 0.4rem;
}
.toc-sidebar a {
  font-size: 0.82rem;
  color: var(--nc-text-secondary);
  display: block;
  padding: 0.2rem 0 0.2rem 0.75rem;
  border-left: 2px solid transparent;
  transition: var(--nc-transition);
}
.toc-sidebar a:hover { color: var(--nc-text); }
.toc-sidebar a.active {
  color: var(--nc-teal-light);
  border-left-color: var(--nc-teal-light);
}
.toc-sidebar .toc-h3 { padding-left: 1.5rem; font-size: 0.78rem; }

/* Related Posts */
.related-section { margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--nc-card-border); }
.related-section h2 { font-size: 1.3rem; margin-bottom: 1.5rem; }

/* Share */
.share-bar {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
}
.share-btn {
  padding: 0.4rem 1rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(255,255,255,0.06);
  color: var(--nc-text-secondary);
  border: 1px solid var(--nc-card-border);
  transition: var(--nc-transition);
}
.share-btn:hover { background: rgba(255,255,255,0.1); color: var(--nc-text); }

/* FAQ Schema Section */
.faq-section { margin-top: 3rem; }
.faq-item {
  border: 1px solid var(--nc-card-border);
  border-radius: 8px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}
.faq-q {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.02);
}
.faq-q:hover { background: rgba(255,255,255,0.04); }
.faq-a { padding: 0 1.25rem 1rem; color: var(--nc-text-secondary); font-size: 0.9rem; display: none; }
.faq-item.open .faq-a { display: block; }

/* --- Footer (Dark) --- */
.kb-footer {
  margin-top: 5rem;
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--nc-card-border);
  color: var(--nc-text-tertiary);
  font-size: 0.85rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-grid h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--nc-text-secondary);
  margin-bottom: 0.75rem;
}
.footer-grid ul { list-style: none; padding: 0; }
.footer-grid li { margin-bottom: 0.35rem; }
.footer-grid a { color: var(--nc-text-tertiary); font-size: 0.82rem; }
.footer-grid a:hover { color: var(--nc-teal-light); }
.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--nc-card-border);
  color: var(--nc-text-tertiary);
  font-size: 0.78rem;
}

/* ==============================
   CERTIFICATION GUIDE STYLES
   ============================== */

/* Level Cards (Landing Page) */
.levels-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
/* Dark-mode level-card override for KB pages */
.kb-footer ~ .levels-grid .level-card,
body > .container-lg .level-card,
.levels-grid .level-card {
  background: var(--nc-card-bg);
  border: 1px solid var(--nc-card-border);
  border-radius: var(--nc-radius);
  padding: 2rem;
  transition: var(--nc-transition);
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 1.5rem;
  align-items: center;
  text-align: left;
  height: auto;
}
.levels-grid .level-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 212, 170, 0.3);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.level-number {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 800;
  flex-shrink: 0;
}
.level-1 .level-number { background: rgba(0, 212, 170, 0.12); color: var(--nc-teal-light); }
.level-2 .level-number { background: rgba(139, 92, 246, 0.12); color: var(--nc-purple); }
.level-3 .level-number { background: rgba(255, 107, 74, 0.12); color: var(--nc-coral); }
.level-4 .level-number { background: rgba(56, 189, 248, 0.12); color: #38BDF8; }
.level-5 .level-number { background: rgba(251, 191, 36, 0.12); color: #FBBF24; }
.level-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: var(--nc-text);
}
.level-info p {
  font-size: 0.9rem;
  color: var(--nc-text-secondary);
  margin: 0;
}
.level-stats {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}
.level-stat {
  text-align: center;
}
.level-stat .stat-number {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--nc-text);
}
.level-stat .stat-label {
  font-size: 0.7rem;
  color: var(--nc-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.level-arrow {
  font-size: 1.2rem;
  color: var(--nc-text-tertiary);
  transition: var(--nc-transition);
}
.level-card:hover .level-arrow { color: var(--nc-teal-light); transform: translateX(3px); }

/* Level Page */
.level-hero {
  padding: 6.5rem 0 2.5rem;
}
.level-hero .level-label {
  display: inline-block;
  padding: 0.3rem 0.9rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}
.level-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
.level-hero .level-desc {
  color: var(--nc-text-secondary);
  font-size: 1.05rem;
  max-width: 640px;
}

/* Chapter Cards */
.chapters-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.chapter-card {
  background: var(--nc-card-bg);
  border: 1px solid var(--nc-card-border);
  border-radius: var(--nc-radius);
  overflow: hidden;
}
.chapter-header {
  padding: 1.5rem 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: var(--nc-transition);
}
.chapter-header:hover { background: rgba(255,255,255,0.02); }
.chapter-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.chapter-number {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 700;
  background: rgba(0, 212, 170, 0.1);
  color: var(--nc-teal-light);
  white-space: nowrap;
}
.chapter-count {
  font-size: 0.8rem;
  color: var(--nc-text-tertiary);
  white-space: nowrap;
}
.chapter-toggle {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--nc-text-tertiary);
}
.chapter-card.open .chapter-toggle { transform: rotate(180deg); }

/* Lecture List */
.lectures-list {
  padding: 0 1.75rem 1.5rem;
  display: none;
}
.chapter-card.open .lectures-list { display: block; }
.lecture-item {
  display: flex;
  align-items: center;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  transition: var(--nc-transition);
  gap: 0.75rem;
}
.lecture-item:last-child { border-bottom: none; }
.lecture-item:hover { padding-left: 0.5rem; }
.lecture-number {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--nc-text-tertiary);
  min-width: 42px;
  font-family: 'SF Mono', 'Fira Code', monospace;
}
.lecture-item a {
  font-size: 0.92rem;
  color: var(--nc-text-secondary);
  flex: 1;
}
.lecture-item:hover a { color: var(--nc-teal-light); }
.lecture-duration {
  font-size: 0.75rem;
  color: var(--nc-text-tertiary);
  white-space: nowrap;
}

/* Lecture Page */
.lecture-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  margin-top: 3rem;
  border-top: 1px solid var(--nc-card-border);
}
.lecture-nav a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--nc-text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--nc-card-border);
  transition: var(--nc-transition);
}
.lecture-nav a:hover {
  background: rgba(0, 212, 170, 0.08);
  border-color: var(--nc-teal-light);
  color: var(--nc-teal-light);
}
.lecture-nav .disabled {
  opacity: 0.3;
  pointer-events: none;
}

/* Progress Indicator */
.progress-bar-container {
  background: rgba(255,255,255,0.06);
  border-radius: 4px;
  height: 6px;
  overflow: hidden;
  margin-top: 0.75rem;
}
.progress-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--nc-teal-light), var(--nc-coral));
  transition: width 0.5s ease;
}

/* Dark-mode Level Badges (inline pills for KB context) */
.level-badge.l1 { background: rgba(0, 212, 170, 0.12); color: var(--nc-teal-light); }
.level-badge.l2 { background: rgba(139, 92, 246, 0.12); color: var(--nc-purple); }
.level-badge.l3 { background: rgba(255, 107, 74, 0.12); color: var(--nc-coral); }
.level-badge.l4 { background: rgba(56, 189, 248, 0.12); color: #38BDF8; }
.level-badge.l5 { background: rgba(251, 191, 36, 0.12); color: #FBBF24; }

/* Certification Roadmap (Landing) */
.roadmap {
  position: relative;
  padding-left: 2rem;
}
.roadmap::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--nc-teal-light), var(--nc-purple), var(--nc-coral), #38BDF8, #FBBF24);
}
.roadmap-node {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 2rem;
}
.roadmap-node::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--nc-teal-light);
  background: var(--nc-navy);
}
.roadmap-node:nth-child(2)::before { border-color: var(--nc-purple); }
.roadmap-node:nth-child(3)::before { border-color: var(--nc-coral); }
.roadmap-node:nth-child(4)::before { border-color: #38BDF8; }
.roadmap-node:nth-child(5)::before { border-color: #FBBF24; }

/* ==============================
   RESPONSIVE
   ============================== */

@media (max-width: 991px) {
  .pillars-grid { grid-template-columns: repeat(2, 1fr); }
  .posts-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .kb-hero h1 { font-size: 2rem; }
  .pillars-grid { grid-template-columns: 1fr; }
  .posts-grid { grid-template-columns: 1fr; }
  .nav-search { display: none; }
  .nav-links { gap: 0.75rem; }
  .post-header h1 { font-size: 1.6rem; }
  .post-content { font-size: 0.95rem; }
  .toc-sidebar { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.5rem; }
  .level-card {
    grid-template-columns: 56px 1fr;
    gap: 1rem;
    padding: 1.25rem;
  }
  .level-number { width: 56px; height: 56px; font-size: 1.4rem; border-radius: 12px; }
  .level-stats { display: none; }
  .level-hero h1 { font-size: 1.8rem; }
  .chapter-header { padding: 1rem 1.25rem; }
  .lectures-list { padding: 0 1.25rem 1rem; }
}

@media (max-width: 480px) {
  .kb-hero h1 { font-size: 1.6rem; }
  .post-header h1 { font-size: 1.35rem; }
  .kb-hero { padding: 6rem 0 2.5rem; }
}

/* --- Utility --- */
.mt-section { margin-top: 4rem; }
.text-gradient {
  background: linear-gradient(135deg, var(--nc-teal-light), var(--nc-coral));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}