:root {
  /* Colors */
  /* Primary Scale (Navy Blue based on #0b1f3a) */
  --pd-color-primary-50: #f0f4f8;
  --pd-color-primary-100: #d9e2ec;
  --pd-color-primary-200: #bcccdc;
  --pd-color-primary-300: #9cb3c9;
  --pd-color-primary-400: #7496b2;
  --pd-color-primary-500: #52799d;
  --pd-color-primary-600: #3e5b76;
  --pd-color-primary-700: #2a3d4f;
  --pd-color-primary-800: #173152; /* Slightly lighter than base for hover */
  --pd-color-primary-900: #0b1f3a; /* Base */
  --pd-color-primary-950: #061224;

  /* Neutral Scale */
  --pd-color-neutral-50: #f8fafc;
  --pd-color-neutral-100: #f1f5f9;
  --pd-color-neutral-200: #e2e8f0;
  --pd-color-neutral-300: #cbd5e1;
  --pd-color-neutral-400: #94a3b8;
  --pd-color-neutral-500: #64748b;
  --pd-color-neutral-600: #475569;
  --pd-color-neutral-700: #334155;
  --pd-color-neutral-800: #1e293b;
  --pd-color-neutral-900: #0f172a;

  /* Semantic Colors */
  --pd-color-success: #10b981;
  --pd-color-error: #ef4444;
  --pd-color-warning: #f59e0b;
  --pd-color-info: #3b82f6;

  /* Backgrounds & Surfaces */
  --pd-bg-base: #ffffff;
  --pd-bg-subtle: var(--pd-color-neutral-50);
  --pd-bg-surface: #ffffff;
  --pd-bg-inverse: var(--pd-color-neutral-900);

  /* Typography Colors */
  --pd-text-base: var(--pd-color-neutral-800);
  --pd-text-muted: var(--pd-color-neutral-500);
  --pd-text-inverse: #ffffff;
  --pd-text-primary: var(--pd-color-primary-900);

  /* Borders */
  --pd-border-base: var(--pd-color-neutral-200);
  --pd-border-hover: var(--pd-color-neutral-300);

  /* Typography */
  --pd-font-family-base: "Lexend", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --pd-font-family-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Font Sizes */
  --pd-text-xs: 0.75rem;     /* 12px */
  --pd-text-sm: 0.875rem;    /* 14px */
  --pd-text-base-size: 1rem; /* 16px */
  --pd-text-lg: 1.125rem;    /* 18px */
  --pd-text-xl: 1.25rem;     /* 20px */
  --pd-text-2xl: 1.5rem;     /* 24px */
  --pd-text-3xl: 1.875rem;   /* 30px */
  --pd-text-4xl: 2.25rem;    /* 36px */
  --pd-text-5xl: 3rem;       /* 48px */

  /* Font Weights */
  --pd-font-weight-regular: 400;
  --pd-font-weight-medium: 500;
  --pd-font-weight-semibold: 600;
  --pd-font-weight-bold: 700;

  /* Line Heights */
  --pd-line-height-none: 1;
  --pd-line-height-tight: 1.25;
  --pd-line-height-snug: 1.375;
  --pd-line-height-normal: 1.5;
  --pd-line-height-relaxed: 1.625;

  /* Spacing */
  --pd-space-1: 0.25rem;  /* 4px */
  --pd-space-2: 0.5rem;   /* 8px */
  --pd-space-3: 0.75rem;  /* 12px */
  --pd-space-4: 1rem;     /* 16px */
  --pd-space-5: 1.25rem;  /* 20px */
  --pd-space-6: 1.5rem;   /* 24px */
  --pd-space-8: 2rem;     /* 32px */
  --pd-space-10: 2.5rem;  /* 40px */
  --pd-space-12: 3rem;    /* 48px */
  --pd-space-16: 4rem;    /* 64px */
  --pd-space-20: 5rem;    /* 80px */
  --pd-space-24: 6rem;    /* 96px */

  /* Border Radius */
  --pd-radius-sm: 0.25rem;  /* 4px */
  --pd-radius-md: 0.375rem; /* 6px */
  --pd-radius-base: 0.5rem; /* 8px */
  --pd-radius-lg: 0.75rem;  /* 12px */
  --pd-radius-xl: 1rem;     /* 16px */
  --pd-radius-full: 9999px;

  /* Shadows (Minimal, clean, reliable) */
  --pd-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --pd-shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --pd-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --pd-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --pd-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --pd-transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}