/* ============================================================
   CityLab — Design Tokens (T2 FRONTEND_FACE / C6 hybrid model)
   Extracted from index.html inline :root block for reuse.
   NOTE: inline :root in index.html kept as DEPRECATED fallback.
   ============================================================ */
:root {
  /* --- Color palette --- */
  --primary: #2563EB;
  --primary-light: #DBEAFE;
  --primary-dark: #1D4ED8;
  --bg-dark: #0B1120;
  --bg-panel: #111827;
  --bg-card: #1A2332;
  --border: #1F2937;
  --text: #E2E8F0;
  --text-dim: #8896AB;
  --text-muted: #A8B8CC;
  --emerald: #10B981;
  --amber: #F59E0B;
  --red: #EF4444;
  --pink: #EC4899;
  --purple: #8B5CF6;

  /* --- Typography --- */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Press Start 2P', monospace;
  --fs-xs: 10px;
  --fs-sm: 11px;
  --fs-base: 12px;
  --fs-md: 13px;
  --fs-lg: 15px;
  --fs-xl: 18px;
  --fs-2xl: 24px;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  /* --- Spacing scale --- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  /* --- Radius --- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* --- Shadows --- */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.25);

  /* --- Transitions --- */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* --- Breakpoints (for JS reference) --- */
  --bp-sm: 1024px;
  --bp-md: 1280px;
  --bp-lg: 1440px;
  --bp-xl: 1920px;
}

/* ============================================================
   A11y — Reduced motion (Track C hardening fase 2)
   Utenti con prefers-reduced-motion: disattiva tutte le animation/transition
   dei widget hybrid (popup slide, alert banner, whatif sliders, network graph)
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================
   C6 — Alerts Banner (G10)
   ============================================================ */
.alerts-banner {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding: 0;
  background: transparent;
}
.alerts-banner.visible {
  display: flex;
  padding: var(--space-2) var(--space-3);
  background: rgba(11, 17, 32, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}
.alerts-banner .alert-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--bg-card);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  font-size: var(--fs-base);
  color: var(--text);
  box-shadow: var(--shadow-sm);
  animation: alert-slide-in var(--transition-base);
}
@keyframes alert-slide-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}
.alerts-banner .alert-dismiss {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: var(--fs-xl);
  line-height: 1;
  cursor: pointer;
  padding: 0 var(--space-2);
  transition: color var(--transition-fast);
}
.alerts-banner .alert-dismiss:hover { color: var(--text); }

/* ============================================================
   C6 — Category Distribution (G11)
   ============================================================ */
#category-dist-widget .widget-header {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-2);
}
#category-dist-widget #cd-svg {
  width: 100%;
  max-width: 180px;
  height: auto;
  display: block;
  margin: 0 auto var(--space-2);
}
#category-dist-widget .cd-legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-1) var(--space-2);
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
#category-dist-widget .cd-legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#category-dist-widget .cd-legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============================================================
   C6 — Fairness Widget
   ============================================================ */
#fairness-widget .widget-header {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-2);
}
#fairness-widget .fairness-main { margin-bottom: var(--space-2); }
#fairness-widget .gini-val {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  font-variant-numeric: tabular-nums;
}
#fairness-widget .gini-bar {
  height: 6px;
  background: var(--bg-panel);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: var(--space-1);
}
#fairness-widget .gini-fill {
  height: 100%;
  transition: width var(--transition-slow), background var(--transition-slow);
}
#fairness-widget .gini-target {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  margin-top: var(--space-1);
}
#fairness-widget .fairness-perc {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  padding: var(--space-2) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
#fairness-widget .fairness-perc b {
  display: block;
  color: var(--text);
  font-size: var(--fs-md);
  font-variant-numeric: tabular-nums;
}
#fairness-widget .fairness-ratio {
  margin-top: var(--space-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
}
#fairness-widget .dim { color: var(--text-dim); }

/* ============================================================
   Responsive — validated breakpoints 1024 / 1280 / 1440 / 1920
   Applies hide-below utility classes to optional widgets.
   ============================================================ */
.hide-below-1280 { display: block; }
.hide-below-1440 { display: block; }

@media (max-width: 1439px) {
  .hide-below-1440 { display: none !important; }
}
@media (max-width: 1279px) {
  .hide-below-1280 { display: none !important; }
  #category-dist-widget #cd-svg { max-width: 140px; }
  #fairness-widget .fairness-perc { gap: var(--space-1); }
}
@media (max-width: 1023px) {
  .left-sidebar,
  .right-sidebar {
    width: 56px !important;
    padding: var(--space-1) !important;
  }
  .right-sidebar .widget-card,
  .right-sidebar .prisma-section,
  .right-sidebar .kpi-grid { display: none; }
  .alerts-banner .alert-row { font-size: var(--fs-xs); }
}
@media (min-width: 1920px) {
  .right-sidebar { width: 360px; }
  .left-sidebar { width: 260px; }
  #category-dist-widget #cd-svg { max-width: 220px; }
}