/* ==========================================================================
   Design Tokens — CSS Custom Properties
   ========================================================================== */

:root {
  /* ---- Color: Primary ---- */
  --color-primary-50:  #eef2ff;
  --color-primary-100: #dbe4ff;
  --color-primary-200: #bac8ff;
  --color-primary-300: #91a7ff;
  --color-primary-400: #748ffc;
  --color-primary-500: #5c7cfa;
  --color-primary-600: #4c6ef5;
  --color-primary-700: #4263eb;
  --color-primary-800: #3b5bdb;
  --color-primary-900: #364fc7;

  /* ---- Color: Secondary ---- */
  --color-secondary-50:  #fff0f6;
  --color-secondary-100: #ffdeeb;
  --color-secondary-200: #fcc2d7;
  --color-secondary-300: #faa2c1;
  --color-secondary-400: #f783ac;
  --color-secondary-500: #f06595;
  --color-secondary-600: #e64980;
  --color-secondary-700: #d6336c;
  --color-secondary-800: #c2255c;
  --color-secondary-900: #a61e4d;

  /* ---- Color: Success ---- */
  --color-success-50:  #ebfbee;
  --color-success-100: #d3f9d8;
  --color-success-200: #b2f2bb;
  --color-success-300: #8ce99a;
  --color-success-400: #69db7c;
  --color-success-500: #51cf66;
  --color-success-600: #40c057;
  --color-success-700: #37b24d;
  --color-success-800: #2f9e44;
  --color-success-900: #2b8a3e;

  /* ---- Color: Warning ---- */
  --color-warning-50:  #fff9db;
  --color-warning-100: #fff3bf;
  --color-warning-200: #ffec99;
  --color-warning-300: #ffe066;
  --color-warning-400: #ffd43b;
  --color-warning-500: #fcc419;
  --color-warning-600: #fab005;
  --color-warning-700: #f59f00;
  --color-warning-800: #f08c00;
  --color-warning-900: #e67700;

  /* ---- Color: Danger ---- */
  --color-danger-50:  #fff5f5;
  --color-danger-100: #ffe3e3;
  --color-danger-200: #ffc9c9;
  --color-danger-300: #ffa8a8;
  --color-danger-400: #ff8787;
  --color-danger-500: #ff6b6b;
  --color-danger-600: #fa5252;
  --color-danger-700: #f03e3e;
  --color-danger-800: #e03131;
  --color-danger-900: #c92a2a;

  /* ---- Color: Neutrals ---- */
  --color-neutral-0:   #ffffff;
  --color-neutral-50:  #f8f9fa;
  --color-neutral-100: #f1f3f5;
  --color-neutral-200: #e9ecef;
  --color-neutral-300: #dee2e6;
  --color-neutral-400: #ced4da;
  --color-neutral-500: #adb5bd;
  --color-neutral-600: #868e96;
  --color-neutral-700: #495057;
  --color-neutral-800: #343a40;
  --color-neutral-900: #212529;
  --color-neutral-950: #0d1117;

  /* ---- Color: Surfaces ---- */
  --surface-background:  var(--color-neutral-0);
  --surface-raised:      var(--color-neutral-50);
  --surface-overlay:     var(--color-neutral-0);
  --surface-sunken:      var(--color-neutral-100);
  --surface-border:      var(--color-neutral-200);
  --surface-border-strong: var(--color-neutral-300);

  /* ---- Semantic color aliases ---- */
  --color-text-primary:   var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-600);
  --color-text-muted:     var(--color-neutral-500);
  --color-text-inverse:   var(--color-neutral-0);
  --color-text-link:      var(--color-primary-600);
  --color-text-link-hover: var(--color-primary-700);

  /* ---- Typography: Font families ---- */
  --font-sans:  "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Georgia", "Times New Roman", serif;
  --font-mono:  "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* ---- Typography: Font sizes (modular scale ~1.25) ---- */
  --text-xs:   0.75rem;   /* 12px */
  --text-sm:   0.875rem;  /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-md:   1.125rem;  /* 18px */
  --text-lg:   1.25rem;   /* 20px */
  --text-xl:   1.5rem;    /* 24px */
  --text-2xl:  1.875rem;  /* 30px */
  --text-3xl:  2.25rem;   /* 36px */
  --text-4xl:  3rem;      /* 48px */
  --text-5xl:  3.75rem;   /* 60px */

  /* ---- Typography: Font weights ---- */
  --weight-regular:  400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  /* ---- Typography: Line heights ---- */
  --leading-tight:  1.25;
  --leading-snug:   1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose:  2;

  /* ---- Typography: Letter spacing ---- */
  --tracking-tight:  -0.025em;
  --tracking-normal:  0;
  --tracking-wide:    0.025em;
  --tracking-wider:   0.05em;
  --tracking-widest:  0.1em;

  /* ---- Spacing scale (4px base) ---- */
  --space-0:   0;
  --space-px:  1px;
  --space-0-5: 0.125rem;  /* 2px  */
  --space-1:   0.25rem;   /* 4px  */
  --space-1-5: 0.375rem;  /* 6px  */
  --space-2:   0.5rem;    /* 8px  */
  --space-2-5: 0.625rem;  /* 10px */
  --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 */
  --space-32:  8rem;      /* 128px */

  /* ---- Border radius ---- */
  --radius-none: 0;
  --radius-sm:   0.25rem;  /* 4px  */
  --radius-md:   0.375rem; /* 6px  */
  --radius-lg:   0.5rem;   /* 8px  */
  --radius-xl:   0.75rem;  /* 12px */
  --radius-2xl:  1rem;     /* 16px */
  --radius-3xl:  1.5rem;   /* 24px */
  --radius-full: 9999px;

  /* ---- Shadows ---- */
  --shadow-xs:  0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm:  0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md:  0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg:  0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl:  0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.06);
  --shadow-none: 0 0 #0000;

  /* ---- Transitions ---- */
  --duration-fast:   100ms;
  --duration-normal: 200ms;
  --duration-slow:   300ms;
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in:      cubic-bezier(0.4, 0, 1, 1);
  --ease-out:     cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out:  cubic-bezier(0.4, 0, 0.2, 1);

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