/* ============================================================
   EPSPilot AI — Design Tokens
   ============================================================ */

:root {
  /* ---- Brand / Accent ---- */
  --color-primary:        #2563EB;
  --color-primary-hover:  #1D4ED8;
  --color-primary-light:  #DBEAFE;
  --color-primary-subtle: #EFF6FF;

  /* ---- Semantic ---- */
  --color-positive:       #059669;
  --color-positive-bg:    #ECFDF5;
  --color-negative:       #DC2626;
  --color-negative-bg:    #FEF2F2;
  --color-warning:        #D97706;
  --color-warning-bg:     #FFFBEB;
  --color-info:           #2563EB;
  --color-info-bg:        #EFF6FF;

  /* ---- Light theme (default) ---- */
  --color-bg:             #F7F9FC;
  --color-surface:        #FFFFFF;
  --color-surface-hover:  #F1F5F9;
  --color-surface-alt:    #F8FAFC;
  --color-text:           #0F172A;
  --color-text-secondary: #64748B;
  --color-text-tertiary:  #94A3B8;
  --color-border:         #E2E8F0;
  --color-border-strong:  #CBD5E1;
  --color-divider:        #F1F5F9;
  --color-backdrop:        rgba(15, 23, 42, 0.4);

  /* ---- Shadows ---- */
  --shadow-xs:   0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg:   0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --shadow-xl:   0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);

  /* ---- Typography ---- */
  --font-family:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono:       'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-size-xs:    0.75rem;    /* 12px */
  --font-size-sm:    0.8125rem;  /* 13px */
  --font-size-base:  0.875rem;   /* 14px */
  --font-size-md:    1rem;       /* 16px */
  --font-size-lg:    1.125rem;   /* 18px */
  --font-size-xl:    1.25rem;    /* 20px */
  --font-size-2xl:   1.5rem;     /* 24px */
  --font-size-3xl:   1.875rem;   /* 30px */
  --font-size-4xl:   2.25rem;    /* 36px */
  --font-weight-normal:   400;
  --font-weight-medium:   500;
  --font-weight-semibold: 600;
  --font-weight-bold:     700;
  --line-height-tight:    1.25;
  --line-height-normal:   1.5;
  --line-height-relaxed:  1.625;
  --letter-spacing-tight: -0.025em;

  /* ---- Spacing ---- */
  --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 */

  /* ---- Radii ---- */
  --radius-sm:   6px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-full: 9999px;

  /* ---- Layout ---- */
  --sidebar-width:      260px;
  --sidebar-collapsed:  72px;
  --topbar-height:      56px;
  --max-content-width:  1440px;
  --card-padding:       var(--space-6);

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

  /* ---- Z-index ---- */
  --z-sidebar:    100;
  --z-overlay:    200;
  --z-modal:      300;
  --z-toast:      400;
  --z-tooltip:    500;
  --z-demo-badge: 600;
}

/* ============================================================
   Dark Theme
   ============================================================ */
[data-theme="dark"] {
  --color-bg:             #0B1220;
  --color-surface:        #111C2E;
  --color-surface-hover:  #1A2742;
  --color-surface-alt:    #0E1829;
  --color-text:           #E2E8F0;
  --color-text-secondary: #94A3B8;
  --color-text-tertiary:  #64748B;
  --color-border:         #1E293B;
  --color-border-strong:  #334155;
  --color-divider:        #1E293B;
  --color-backdrop:       rgba(0, 0, 0, 0.6);

  --color-primary-light:  #1E3A5F;
  --color-primary-subtle: #0F2744;

  --color-positive-bg:    #064E3B;
  --color-negative-bg:    #7F1D1D;
  --color-warning-bg:     #78350F;
  --color-info-bg:        #1E3A8A;

  --shadow-xs:   0 1px 2px rgba(0,0,0,0.2);
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md:   0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -2px rgba(0,0,0,0.2);
  --shadow-lg:   0 10px 15px -3px rgba(0,0,0,0.3), 0 4px 6px -4px rgba(0,0,0,0.2);
  --shadow-xl:   0 20px 25px -5px rgba(0,0,0,0.3), 0 8px 10px -6px rgba(0,0,0,0.2);
}

/* ============================================================
   Reduced Motion
   ============================================================ */
@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;
  }
}