/**
 * NZ Road Safety Analytics - Professional Design System
 * Enterprise-grade visual design for government data visualization
 */

/* === TYPOGRAPHY SYSTEM === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
  /* Primary Brand Colors - Clean Professional Blue */
  --primary-900: #1e293b;
  --primary-800: #334155;
  --primary-700: #475569;
  --primary-600: #64748b;
  --primary-500: #94a3b8;
  --primary-400: #cbd5e1;
  --primary-300: #e2e8f0;
  --primary-200: #f1f5f9;
  --primary-100: #f8fafc;
  --primary-50: #ffffff;

  /* Emergency/Alert Colors - Professional Red */
  --alert-900: #7f1d1d;
  --alert-800: #991b1b;
  --alert-700: #b91c1c;
  --alert-600: #dc2626;
  --alert-500: #ef4444;
  --alert-400: #f87171;
  --alert-300: #fca5a5;
  --alert-200: #fecaca;
  --alert-100: #fee2e2;
  --alert-50: #fef2f2;

  /* Success Colors */
  --success-900: #14532d;
  --success-800: #166534;
  --success-700: #15803d;
  --success-600: #16a34a;
  --success-500: #22c55e;
  --success-400: #4ade80;
  --success-300: #86efac;
  --success-200: #bbf7d0;
  --success-100: #dcfce7;
  --success-50: #f0fdf4;

  /* Warning Colors - Professional Amber */
  --warning-900: #78350f;
  --warning-800: #92400e;
  --warning-700: #b45309;
  --warning-600: #d97706;
  --warning-500: #f59e0b;
  --warning-400: #fbbf24;
  --warning-300: #fcd34d;
  --warning-200: #fde68a;
  --warning-100: #fef3c7;
  --warning-50: #fffbeb;

  /* Neutral Colors */
  --neutral-900: #111827;
  --neutral-800: #1f2937;
  --neutral-700: #374151;
  --neutral-600: #4b5563;
  --neutral-500: #6b7280;
  --neutral-400: #9ca3af;
  --neutral-300: #d1d5db;
  --neutral-200: #e5e7eb;
  --neutral-100: #f3f4f6;
  --neutral-50: #f9fafb;
  --neutral-white: #ffffff;

  /* Background System */
  --bg-primary: var(--neutral-white);
  --bg-secondary: var(--neutral-50);
  --bg-tertiary: var(--neutral-100);
  --bg-accent: var(--primary-50);
  --bg-overlay: rgba(17, 24, 39, 0.75);

  /* Text System */
  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-700);
  --text-tertiary: var(--neutral-500);
  --text-inverse: var(--neutral-white);
  --text-accent: var(--primary-600);
  --text-alert: var(--alert-600);

  /* Border System */
  --border-primary: var(--neutral-200);
  --border-secondary: var(--neutral-300);
  --border-focus: var(--primary-500);
  --border-alert: var(--alert-300);

  /* Shadow System */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Radius System */
  --radius-none: 0;
  --radius-sm: 0.125rem;
  --radius-base: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* Spacing System */
  --space-px: 1px;
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Typography Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  --font-black: 900;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-Index Scale */
  --z-auto: auto;
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-navigation: 1000;
  --z-subnav: 999;
  --z-modal: 1100;
  --z-popover: 1110;
  --z-tooltip: 1120;
  --z-notification: 1130;
}

/* === BASE STYLES === */
* {
  box-sizing: border-box;
}

html {
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  margin: 0;
  padding: 0;
}

/* === PROFESSIONAL NAVIGATION === */
.navigation-system {
  background: var(--neutral-900);
  border-bottom: 1px solid var(--neutral-700);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-navigation);
}

.navigation-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}

.navigation-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-inverse);
  font-weight: var(--font-semibold);
  font-size: var(--text-lg);
  letter-spacing: -0.025em;
  transition: color var(--transition-fast);
}

.navigation-brand:hover {
  color: rgba(255, 255, 255, 0.9);
}

.navigation-brand-icon {
  width: 1.75rem;
  height: 1.75rem;
  background: var(--alert-600);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  border: 2px solid var(--neutral-700);
}

.navigation-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.navigation-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.navigation-link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-inverse);
  transform: translateY(-1px);
}

.navigation-link.active {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-inverse);
  font-weight: var(--font-semibold);
}

.navigation-link.active::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 0.5rem;
  height: 2px;
  background: var(--alert-400);
  border-radius: var(--radius-full);
}

.navigation-link-icon {
  width: 1rem;
  height: 1rem;
  opacity: 0.9;
}

/* === CARD SYSTEM === */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

/* Professional card accent */
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-600);
}

.card:hover {
  border-color: var(--primary-400);
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-secondary);
  position: relative;
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.025em;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.card-body {
  padding: var(--space-6);
}

/* === BUTTON SYSTEM === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: var(--leading-none);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  user-select: none;
}

.btn:focus {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--primary-600);
  color: var(--text-inverse);
  border-color: var(--primary-600);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-secondary);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--border-primary);
  transform: translateY(-1px);
}

.btn-alert {
  background: var(--alert-600);
  color: var(--text-inverse);
  border-color: var(--alert-600);
}

.btn-alert:hover {
  background: var(--alert-700);
  transform: translateY(-1px);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* === METRICS SYSTEM === */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.metric-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-600);
}

.metric-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-secondary);
}

.metric-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.metric-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.metric-icon {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--primary-100);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-600);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
}

.metric-value {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  color: var(--text-primary);
  line-height: var(--leading-none);
  margin: var(--space-2) 0;
  font-variant-numeric: tabular-nums;
}

.metric-change {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}

.metric-change.positive {
  color: var(--success-600);
}

.metric-change.negative {
  color: var(--alert-600);
}

.metric-change.neutral {
  color: var(--text-tertiary);
}

/* === PROFESSIONAL ICONS === */
.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: middle;
}

.icon-dashboard::before { content: "📊"; }
.icon-tracker::before { content: "⏱️"; }
.icon-calendar::before { content: "📅"; }
.icon-external::before { content: "↗️"; }
.icon-alert::before { content: "⚠️"; }
.icon-safety::before { content: "🛡️"; }

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
  .navigation-container {
    padding: 0 var(--space-4);
  }

  .metrics-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-4);
  }
}

@media (max-width: 768px) {
  .navigation-container {
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-4);
    min-height: auto;
  }

  .navigation-links {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .navigation-link {
    flex: 1;
    min-width: auto;
    justify-content: center;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .metric-value {
    font-size: var(--text-3xl);
  }
}

@media (max-width: 480px) {
  .navigation-container {
    padding: var(--space-3);
  }

  .card-header,
  .card-body {
    padding: var(--space-4);
  }

  .metric-card {
    padding: var(--space-4);
  }
}