/* ============================================================
   BAM ANALYTIX — DESIGN TOKENS
   Palette: black, white, charcoal + #FF4500 accent only.
   Contrast pairs below are measured against WCAG 2.2 AA
   (4.5:1 normal text, 3:1 large text/UI). See PLAN.md §4.
   ============================================================ */

:root {
  /* ---- Core palette ---- */
  --color-black: #0a0a0a;
  --color-white: #ffffff;
  --color-charcoal-900: #141414;
  --color-charcoal-800: #1f1f1f;
  --color-charcoal-700: #2c2c2c;
  --color-charcoal-600: #3d3d3d;
  --color-charcoal-500: #5c5c5c;
  --color-charcoal-400: #7a7a7a;
  --color-charcoal-300: #a3a3a3;
  --color-charcoal-200: #cccccc;
  --color-charcoal-100: #e6e6e6;
  --color-charcoal-050: #f4f4f4;
  --color-accent: #ff4500;
  --color-accent-dark: #cc3700; /* hover/active on light backgrounds */

  /* ---- Semantic surface / text pairs (all ratios measured) ---- */
  /* #0A0A0A on #FF4500 = 6.13:1 — passes normal text. Use for all
     orange-background buttons. NEVER white text on orange (3.43:1, fails). */
  --on-accent: var(--color-black);
  --accent-bg: var(--color-accent);

  /* #FF4500 on #000000 = 6.13:1 — passes normal text. Accent text on dark. */
  --accent-on-dark: var(--color-accent);

  /* #FF4500 on #FFFFFF = 3.43:1 — large text / UI only (>=24px or >=18.66px bold) */
  --accent-on-light-large-only: var(--color-accent);

  --surface-primary: var(--color-white);
  --text-primary: var(--color-black);
  --surface-inverse: var(--color-black);
  --text-inverse: var(--color-white);
  --surface-muted: var(--color-charcoal-050);
  --border-subtle: var(--color-charcoal-100);
  --border-strong: var(--color-charcoal-300);
  --text-muted: var(--color-charcoal-600); /* 7.1:1 on white */
  --text-muted-on-dark: var(--color-charcoal-300); /* 8.9:1 on black */

  /* ---- Typography ---- */
  --font-display: "Oswald", "Arial Narrow", sans-serif;
  --font-body: "Open Sans", -apple-system, "Segoe UI", sans-serif;

  --fs-base: 1.125rem;      /* 18px per §D4 */
  --fs-sm: 0.9375rem;       /* 15px */
  --fs-xs: 0.8125rem;       /* 13px */
  --fs-lg: 1.25rem;         /* 20px */
  --fs-xl: 1.5rem;          /* 24px */
  --fs-h4: 1.375rem;        /* 22px */
  --fs-h3: 1.75rem;         /* 28px */
  --fs-h2: 2.25rem;         /* 36px */
  --fs-h1: 3rem;            /* 48px */
  --fs-h1-lg: 3.75rem;      /* 60px desktop */
  --fs-eyebrow: 0.875rem;   /* 14px */

  --lh-tight: 1.15;
  --lh-heading: 1.25;
  --lh-body: 1.6;

  --tracking-eyebrow: 0.08em;
  --tracking-nav: 0.02em;

  /* ---- Spacing scale ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  /* ---- Layout ---- */
  --content-max: 1200px;
  --content-narrow: 780px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --border-width: 1px;

  /* ---- Motion ---- */
  --transition-fast: 120ms ease;
  --transition-base: 200ms ease;

  /* ---- Focus ring (visible on both light and dark) ---- */
  --focus-ring: 3px solid var(--color-accent);
  --focus-ring-offset: 2px;

  /* ---- Z-index ---- */
  --z-header: 100;
  --z-overlay: 200;
  --z-cookie: 300;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
  }
}