/*
 * TherapyBuilt — tokens.css
 *
 * Structural design tokens: spacing, type scale, radius, shadow, layout.
 * Brand color tokens (--tb-*) are injected at runtime by TB_Style_Controller.
 * Never hardcode color values in component stylesheets — always use var(--tb-*).
 */

:root {

  /* -------------------------------------------------------------------------
   * 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 */

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

  --font-weight-normal:   400;
  --font-weight-medium:   500;
  --font-weight-semibold: 600;
  --font-weight-bold:     700;

  --line-height-tight:  1.2;
  --line-height-snug:   1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose:  2;

  --letter-spacing-tight:  -0.025em;
  --letter-spacing-normal:  0em;
  --letter-spacing-wide:    0.025em;
  --letter-spacing-wider:   0.05em;

  /* -------------------------------------------------------------------------
   * Border radius
   * ------------------------------------------------------------------------- */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

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

  /* -------------------------------------------------------------------------
   * Layout
   * ------------------------------------------------------------------------- */
  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1280px;
  --container-2xl: 1440px;

  --section-padding-y:     var(--space-20);
  --section-padding-x:     var(--space-6);

  /* -------------------------------------------------------------------------
   * Transitions
   * ------------------------------------------------------------------------- */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* -------------------------------------------------------------------------
   * Z-index scale
   * ------------------------------------------------------------------------- */
  --z-below:    -1;
  --z-base:      0;
  --z-above:     1;
  --z-dropdown:  100;
  --z-sticky:    200;
  --z-overlay:   300;
  --z-modal:     400;
  --z-toast:     500;
}