/* ============================================
   Design Tokens — Single source of truth
   All colors, spacing, type scale, shadows, radii, breakpoints
   Light & dark theme variants
   ============================================ */

/* --- Light theme (default) --- */
:root,
[data-theme='light'] {
  /* Brand */
  --color-primary: #1B2A4A;
  --color-primary-light: #2A3F6B;
  --color-primary-dark: #111C33;
  --color-accent: #C8512B;
  --color-accent-hover: #A8421F;
  --color-accent-light: #D4724A;
  --color-accent-bg: #FFF3EE;

  /* Backgrounds */
  --color-bg: #FAFAF8;
  --color-bg-alt: #F3F1EC;
  --color-surface: #FFFFFF;
  --color-surface-raised: #FFFFFF;

  /* Text */
  --color-text: #1B2A4A;
  --color-text-secondary: #5A5A5A;
  --color-text-muted: #8A8A8A;
  --color-text-inverse: #FFFFFF;

  /* Borders */
  --color-border: #E5E2DC;
  --color-border-light: #F0EDE7;

  /* Semantic */
  --color-success: #2D6A4F;
  --color-success-bg: #F0FDF4;
  --color-warning: #B45309;
  --color-warning-bg: #FFFBEB;
  --color-error: #B91C1C;
  --color-error-bg: #FEF2F2;

  /* Overlays */
  --color-overlay: rgba(27, 42, 74, 0.5);
  --color-overlay-heavy: rgba(27, 42, 74, 0.7);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.04);
}

/* --- Dark theme --- */
[data-theme='dark'] {
  /* Brand */
  --color-primary: #1B2A4A;
  --color-primary-light: #3A5280;
  --color-primary-dark: #0E1624;
  --color-accent: #D4724A;
  --color-accent-hover: #E08A66;
  --color-accent-light: #E0A080;
  --color-accent-bg: #1E1510;

  /* Backgrounds — navy-tinted darks for warmth */
  --color-bg: #12161E;
  --color-bg-alt: #171C26;
  --color-surface: #1C2230;
  --color-surface-raised: #232A3A;

  /* Text */
  --color-text: #E8E6E3;
  --color-text-secondary: #9A9DA3;
  --color-text-muted: #5E6370;
  --color-text-inverse: #1B2A4A;

  /* Borders */
  --color-border: #2A3040;
  --color-border-light: #333A4A;

  /* Semantic */
  --color-success: #52B788;
  --color-success-bg: #141F1A;
  --color-warning: #F59E0B;
  --color-warning-bg: #1E1A10;
  --color-error: #F87171;
  --color-error-bg: #1E1414;

  /* Overlays */
  --color-overlay: rgba(0, 0, 0, 0.5);
  --color-overlay-heavy: rgba(0, 0, 0, 0.7);

  /* Shadows — more subtle in dark mode */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.25), 0 1px 2px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.35), 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* --- Theme-independent tokens (same in both modes) --- */
:root {
  /* Type scale — fluid with clamp */
  --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.75rem);       /* ~12px */
  --fs-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);      /* ~14px */
  --fs-base: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);         /* ~16px */
  --fs-md: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);         /* ~18px */
  --fs-lg: clamp(1.1rem, 1rem + 0.5vw, 1.25rem);            /* ~20px */
  --fs-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);         /* ~24px */
  --fs-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 1.875rem);      /* ~30px */
  --fs-3xl: clamp(1.75rem, 1.4rem + 1.75vw, 2.25rem);       /* ~36px */
  --fs-4xl: clamp(2rem, 1.5rem + 2.5vw, 3rem);              /* ~48px */

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

  /* Section padding — responsive */
  --section-py: clamp(2rem, 1.5rem + 1.5vw, 3.5rem);
  --section-py-sm: clamp(1.25rem, 1rem + 1vw, 2.25rem);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 720px;
  --container-px: var(--space-6);

  /* Border radius */
  --radius-sm: 0;
  --radius-md: 0;
  --radius-lg: 0;
  --radius-xl: 0;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 400ms ease-out;

  /* Z-index scale */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 50;
  --z-overlay: 100;
  --z-modal: 200;
  --z-toast: 300;
}