/* ─── MDF Specs Hub — Editorial Stark B&W (The Economist + Palantir hybrid) ─── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Noto+Serif:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&display=swap');

/* ── Design tokens ── */
:root {
  --bg:          #FFFFFF;   /* Stark white background */
  --bg-alt:      #FAFAFA;   /* Stark paper off-white (minimal use) */
  --bg-subtle:   #EAEAEA;   /* Very light fallback accent */
  --ink:         #000000;   /* Stark black text */
  --ink-muted:   #111111;   /* Stark dark body copy */
  --ink-faint:   #444444;   /* High-density metadata gray */
  --border:      #000000;   /* Stark black dividers and borders */
  --border-soft: #222222;

  /* Semantic Grayscale Signals */
  --blue:        #000000;
  --blue-light:  #FFFFFF;
  --green:       #000000;
  --green-light: #FFFFFF;
  --amber:       #000000;
  --amber-light: #FFFFFF;

  --radius-sm:   0px;       /* Stark square corners - militaristic engineering */
  --radius:      0px;       /* Zero rounded corners */
  --max-w:       1200px;
  --font-serif:  'Publico Headline', 'Publico', 'Lora', Georgia, serif;
  --font-sans:   'Graphik', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body:   'Noto Serif', Georgia, serif;
}

/* ── Reset ── */
*, *::before, *::after { 
  box-sizing: border-box; 
  border-radius: 0px !important; /* Force zero rounded corners everywhere */
  transition: none !important;    /* Strip all transitions/animations */
  box-shadow: none !important;    /* Strip all shadows */
}

/* ── Root ── */
.hub-root {
  min-height: 100vh;
  background: var(--bg);
  font-family: var(--font-sans);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.hub-section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Hero (Stark Corporate Headline) ── */
.hub-hero {
  border-bottom: 2px solid var(--border);
  padding: 5rem 2rem 4rem;
  background: var(--bg);
  text-align: center;
}

.hub-hero-glow { display: none; }

.hub-hero-inner {
  max-width: 800px;
  margin: 0 auto;
}

.hub-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--bg);
  padding: 0.25rem 0.75rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
}

.hub-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.hub-title-sub {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-top: 1rem;
  max-width: 720px;
}

.hub-description {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  color: var(--ink-muted);
  line-height: 1.75;
  max-width: 700px;
  margin: 0 auto 3rem;
}

/* Stats (Dense High-Density Layout) */
.hub-stats {
  display: flex;
  justify-content: center;
  gap: 3.5rem;
  flex-wrap: wrap;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.hub-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.hub-stat-number {
  font-family: var(--font-sans);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--ink);
  line-height: 1;
}

.hub-stat-label {
  font-size: 0.78rem;
  color: var(--ink-faint);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── Section Title ── */
.hub-section-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 2rem;
  letter-spacing: -0.015em;
  text-align: center;
  text-transform: uppercase;
}

/* ── Intro section (Stark technical grid) ── */
.hub-intro {
  padding: 4.5rem 0;
  border-bottom: 2px solid var(--border);
  background: var(--bg);
}

.hub-intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.hub-intro-card {
  background: var(--bg);
  padding: 2rem;
  border: 1px solid var(--border);
  transform: none !important;
}

.hub-intro-card:hover {
  background: var(--bg-alt);
}

.hub-intro-card-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
  display: block;
  margin-bottom: 0.75rem;
}

.hub-intro-card-desc {
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.6;
  margin: 0;
}

/* ── Filters (Minimalist stark sticky navbar) ── */
.hub-filters {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 2px solid var(--border);
}

.hub-filters-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.hub-filters-inner::-webkit-scrollbar { display: none; }

.hub-filter-btn {
  padding: 1.1rem 1.25rem;
  border: none;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--ink-faint);
  font-size: 0.85rem;
  font-weight: 800;
  font-family: var(--font-sans);
  cursor: pointer;
  white-space: nowrap;
  margin-bottom: -2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hub-filter-btn:hover {
  color: var(--ink);
}

.hub-filter-btn.active {
  color: var(--ink);
  border-bottom-color: var(--border);
  font-weight: 800;
  background: transparent;
}

/* ── Articles list ── */
.hub-articles {
  padding: 4.5rem 0 6rem;
  background: var(--bg);
}

.hub-cluster-block {
  margin-bottom: 4.5rem;
}

.hub-cluster-block:last-child {
  margin-bottom: 0;
}

.hub-cluster-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border);
}

.hub-cluster-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  flex: 1;
}

.hub-cluster-count {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Cards grid ── */
.hub-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.hub-cards-grid--wide {
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
}

/* ── Article Card (Stark B&W Technical Directory Block) ── */
.hub-card {
  background: #FFFFFF;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  border: 1px solid var(--border);
  position: relative;
  transform: none !important;
}

.hub-card:hover {
  background: var(--bg-alt);
}

.hub-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hub-card-cluster {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.2rem 0.5rem;
  background: var(--bg) !important;
  color: var(--ink) !important;
  border: 1px solid var(--border) !important;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hub-card-priority {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  color: var(--ink) !important;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-subtle) !important;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--border) !important;
}

.hub-card-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  line-height: 1.35;
  letter-spacing: -0.015em;
  flex: 1;
}

.hub-card-desc {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.6;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.hub-card-kws {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.25rem;
}

.hub-card-kw {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  color: var(--ink-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.15rem 0.5rem;
}

.hub-card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.hub-card-badges { display: flex; gap: 0.35rem; flex-wrap: wrap; }

.badge {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 800;
  padding: 0.15rem 0.5rem;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge--score {
  color: var(--ink) !important;
  background: var(--bg-subtle) !important;
  border-color: var(--border) !important;
}

.badge--draft {
  color: var(--ink-faint) !important;
  background: var(--bg) !important;
  border-color: var(--border) !important;
}

.hub-card-cta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--ink);
  text-decoration: underline;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.hub-card-cta:hover { color: var(--ink-faint); }

/* ── Loading / Empty ── */
.hub-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 6rem;
  color: var(--ink);
}

.hub-spinner {
  width: 32px;
  height: 32px;
  border: 4px solid var(--bg-subtle);
  border-top-color: var(--ink);
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.hub-empty {
  text-align: center;
  padding: 4rem;
  color: var(--ink);
  font-family: var(--font-serif);
  border: 1px solid var(--border);
}

.hub-empty a { color: var(--ink); font-family: var(--font-sans); font-weight: 800; text-decoration: underline; }

/* ── Authority / Sources ── */
.hub-authority {
  padding: 5rem 0 6rem;
  border-top: 2px solid var(--border);
  background: var(--bg);
}

.hub-authority-intro {
  font-family: var(--font-serif);
  color: var(--ink-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  line-height: 1.7;
  max-width: 720px;
}

.hub-sources-list {
  list-style: none;
  padding: 0;
  margin: 0 0 3rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.hub-source-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--ink-muted);
  padding: 0.85rem 1rem;
  background: #FFFFFF;
  border: 1px solid var(--border);
}

.hub-source-dot {
  width: 6px;
  height: 6px;
  background: var(--ink);
  flex-shrink: 0;
  margin-top: 0.45rem;
}

/* ── About Box ── */
.hub-about {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-left: 6px solid var(--ink);
  padding: 2rem;
}

.hub-about h3 {
  font-family: var(--font-sans);
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
}

.hub-about p {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--ink-muted);
  line-height: 1.7;
  margin: 0;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .hub-hero { padding: 4rem 1.25rem 3rem; }
  .hub-stats { gap: 2rem; }
  .hub-stat-number { font-size: 1.5rem; }
  .hub-section-inner { padding: 0 1.25rem; }
  .hub-cards-grid { grid-template-columns: 1fr; gap: 1rem; }
  .hub-sources-list { grid-template-columns: 1fr; gap: 0.75rem; }
  .hub-intro-grid { grid-template-columns: 1fr; gap: 1rem; }
  .hub-about { padding: 1.5rem; }
}