:root {
  /* ===== Trip Frogger Color Palette ===== */
  --tf-primary: #059669;
  --tf-primary-dark: #064e3b;
  --tf-primary-light: #34d399;
  --tf-secondary: #0d9488;
  --tf-secondary-light: #5eead4;
  --tf-accent: #2563eb;
  --tf-accent-light: #93c5fd;
  --tf-white: #ffffff;
  --tf-bg: #f8fafc;
  --tf-bg-sidebar: #064e3b;
  --tf-text: #1e293b;
  --tf-text-light: #64748b;
  --tf-text-sidebar: rgba(255, 255, 255, 0.85);
  --tf-border: #e2e8f0;
  --tf-success: #10b981;
  --tf-warning: #f59e0b;
  --tf-danger: #ef4444;

  /* Gradients */
  --tf-gradient: linear-gradient(135deg, #059669 0%, #0d9488 50%, #2563eb 100%);
  --tf-gradient-subtle: linear-gradient(135deg, #ecfdf5 0%, #f0fdfa 50%, #eff6ff 100%);

  /* Spacing (8px base grid) */
  --tf-space-xs: 0.25rem;
  --tf-space-sm: 0.5rem;
  --tf-space-md: 1rem;
  --tf-space-lg: 1.5rem;
  --tf-space-xl: 2rem;
  --tf-space-2xl: 3rem;

  /* Border radius */
  --tf-radius-sm: 0.375rem;
  --tf-radius-md: 0.5rem;
  --tf-radius-lg: 0.75rem;
  --tf-radius-xl: 1rem;
  --tf-radius-full: 9999px;

  /* Shadows */
  --tf-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --tf-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --tf-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --tf-shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.16);

  /* Typography */
  --tf-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --tf-font-size-xs: 0.75rem;
  --tf-font-size-sm: 0.875rem;
  --tf-font-size-md: 1rem;
  --tf-font-size-lg: 1.125rem;
  --tf-font-size-xl: 1.25rem;
  --tf-font-size-2xl: 1.5rem;
  --tf-font-size-3xl: 1.875rem;

  /* Sidebar */
  --tf-sidebar-width: 260px;
  --tf-sidebar-collapsed: 64px;
  --tf-mobile-nav-height: 64px;

  /* Transitions */
  --tf-transition-fast: 0.15s ease;
  --tf-transition-base: 0.2s ease;
  --tf-transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}