/* ==========================================================================
   Precision Performance Physio — design tokens
   Single source of truth for colour, type, space, radius, shadow and motion.
   Every foreground/background pair used in site.css is contrast-tested;
   ratios are noted inline. Target: WCAG 2.2 AA (4.5:1 text, 3:1 UI/large).
   ========================================================================== */

@font-face {
  font-family: 'Archivo Var';
  src: url('../assets/fonts/archivo-var-latin.woff2') format('woff2-variations');
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
    U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Inter Var';
  src: url('../assets/fonts/inter-var-latin.woff2') format('woff2-variations');
  font-weight: 100 900;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
    U+FEFF, U+FFFD;
}

/* Metric-matched fallbacks — hold layout while the webfonts load so the
   swap does not shift text (protects CLS). */
@font-face {
  font-family: 'Archivo Fallback';
  src: local('Arial');
  ascent-override: 92%;
  descent-override: 24%;
  line-gap-override: 0%;
  size-adjust: 101%;
}
@font-face {
  font-family: 'Inter Fallback';
  src: local('Arial');
  ascent-override: 90%;
  descent-override: 22%;
  line-gap-override: 0%;
  size-adjust: 107%;
}

:root {
  /* ---------- brand core (supplied) ---------- */
  --brand-purple: #9315b8;   /* Performance Purple */
  --brand-plum: #682d79;     /* Deep Plum          */
  --brand-eggplant: #4c2358; /* Dark Eggplant      */
  --brand-black: #000000;
  --brand-white: #ffffff;

  /* ---------- extended purple ramp ---------- */
  --purple-900: #1a0c1f;
  --purple-850: #22101f;
  --purple-800: #2a1030;  /* primary dark surface   */
  --purple-700: #3a1745;
  --purple-600: var(--brand-eggplant);
  --purple-500: var(--brand-plum);
  --purple-400: #7d0f9e;  /* purple hover/active — 8.63:1 on white */
  --purple-300: var(--brand-purple);
  --purple-200: #c77de0;  /* accent on dark — 6.12:1 on --purple-800 */
  --purple-150: #d9a8ec;  /* focus ring on dark — 8.86:1 on --purple-800 */
  --purple-100: #e8d5f0;  /* body text on dark — 12.51:1 on --purple-800 */
  --purple-050: #f3eaf7;  /* tinted light surface */

  /* ---------- neutrals (warm, purple-leaning) ---------- */
  --ink: #1a1420;         /* headings on light — 18.03:1 on white */
  --ink-soft: #3d3545;    /* body on light     — 11.71:1 on white */
  --muted: #5c5265;       /* secondary text    —  7.37:1 on white */
  --shell: #fbfafc;       /* page background   */
  --surface: #f7f5f9;     /* raised light surface */
  --surface-2: #efecf2;
  --hairline: #e4dfe8;    /* decorative rules only, never a lone UI boundary */
  --control-border: #8e8399; /* form/UI boundary — 3.59:1 on white */

  /* ---------- semantic: light context ---------- */
  --bg: var(--shell);
  --text: var(--ink-soft);
  --heading: var(--ink);
  --text-muted: var(--muted);
  --accent: var(--brand-purple);
  --accent-strong: var(--purple-400);
  --link: var(--purple-400);         /* 8.63:1 on white */
  --link-hover: var(--brand-eggplant);
  --focus-ring: var(--brand-purple); /* 6.91:1 on white */
  --card-bg: var(--brand-white);
  --card-border: var(--hairline);

  /* ---------- semantic: dark context ---------- */
  --dark-bg: var(--purple-800);
  --dark-bg-deep: var(--purple-900);
  --dark-heading: var(--brand-white);      /* 17.28:1 on --purple-800 */
  --dark-text: var(--purple-100);          /* 12.51:1 */
  --dark-muted: #bda6c7;                   /*  8.0:1  */
  --dark-accent: var(--purple-200);        /*  6.12:1 */
  --dark-focus-ring: var(--purple-150);    /*  8.86:1 */
  --dark-hairline: #4a3352;                /* decorative */
  --dark-control-border: #7e6688;          /* 3.41:1 on --purple-800 */

  /* ---------- typography ---------- */
  --font-display: 'Archivo Var', 'Archivo Fallback', 'Archivo', system-ui, sans-serif;
  --font-body: 'Inter Var', 'Inter Fallback', 'Inter', system-ui, -apple-system, sans-serif;

  --fs-display: clamp(2.5rem, 1.55rem + 4.2vw, 4.75rem);
  --fs-h1: clamp(2.125rem, 1.5rem + 2.6vw, 3.5rem);
  --fs-h2: clamp(1.75rem, 1.34rem + 1.75vw, 2.75rem);
  --fs-h3: clamp(1.1875rem, 1.08rem + 0.48vw, 1.5rem);
  --fs-h4: clamp(1.0625rem, 1.02rem + 0.2vw, 1.1875rem);
  --fs-lead: clamp(1.125rem, 1.05rem + 0.36vw, 1.3125rem);
  --fs-body: clamp(1.0625rem, 1.03rem + 0.16vw, 1.125rem);
  --fs-small: 0.9375rem;
  --fs-xs: 0.8125rem;
  --fs-eyebrow: 0.8125rem;

  --lh-tight: 1.05;
  --lh-snug: 1.18;
  --lh-heading: 1.25;
  --lh-body: 1.65;

  --measure: 68ch;
  --measure-narrow: 58ch;

  /* ---------- space ---------- */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-7: 2rem;
  --sp-8: 2.5rem;
  --sp-9: 3rem;
  --sp-10: 4rem;
  --sp-11: 5rem;
  --sp-12: 6rem;

  --section-y: clamp(3.75rem, 2.5rem + 5.2vw, 7.5rem);
  --section-y-tight: clamp(2.75rem, 2rem + 3.4vw, 5rem);
  --gutter: clamp(1.25rem, 0.65rem + 2.6vw, 3rem);
  --container: 75rem;      /* 1200px */
  --container-narrow: 48rem;

  /* ---------- radius ---------- */
  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 28px;
  --r-pill: 999px;

  /* ---------- elevation (plum-tinted, restrained) ---------- */
  --sh-sm: 0 1px 2px rgba(26, 12, 31, 0.05), 0 1px 3px rgba(26, 12, 31, 0.04);
  --sh-md: 0 2px 4px rgba(26, 12, 31, 0.04), 0 6px 16px -6px rgba(26, 12, 31, 0.10);
  --sh-lg: 0 4px 8px rgba(26, 12, 31, 0.05), 0 18px 40px -14px rgba(26, 12, 31, 0.18);
  --sh-focus: 0 0 0 3px var(--brand-white), 0 0 0 6px var(--focus-ring);

  /* ---------- motion ---------- */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 120ms;
  --dur: 220ms;
  --dur-slow: 420ms;

  /* ---------- layout constants ---------- */
  --header-h: 98px;        /* minimum header height */
  --header-real: 98px;     /* actual measured height, written by site.js */
  --mobile-cta-h: 0px; /* set to real height in the mobile media query */
}

@media (min-width: 60rem) {
  :root { --header-h: 118px; --header-real: 118px; }
}

@media (prefers-reduced-motion: reduce) {
  :root { --dur-fast: 0.01ms; --dur: 0.01ms; --dur-slow: 0.01ms; }
}