@import "tailwindcss";

/* ── Signal Design Tokens — v1.0 ──
   Source: docs/design-tokens-v1.json + docs/sttil-brand-system-v1.md
   Accent family: tangerine (warm gold on dark, restrained copper on light)
*/

@theme {
  /* ── Color: Teal (dominant system color) ── */
  --color-teal-50:  #EEF8F8;
  --color-teal-100: #CBE9E9;
  --color-teal-200: #97D3D3;
  --color-teal-300: #5BBBBB;
  --color-teal-400: #2EA3A3;
  --color-teal-500: #1A8A8A;
  --color-teal-600: #147A7A;
  --color-teal-700: #0F5E5E;
  --color-teal-800: #0A4444;
  --color-teal-900: #072E2E;
  --color-teal-950: #041A1A;

  /* ── Color: Tangerine (accent) ── */
  --color-tng-50:  #FFF4EE;
  --color-tng-100: #FFE4CC;
  --color-tng-200: #FFC090;
  --color-tng-300: #FFB070;
  --color-tng-400: #F07840;
  --color-tng-500: #E06028;
  --color-tng-600: #C04E1C;
  --color-tng-700: #903A14;
  --color-tng-800: #6A2A0C;
  --color-tng-900: #3E1808;

  /* ── Color: Neutral (teal-toned) ── */
  --color-neutral-0:   #FFFFFF;
  --color-neutral-50:  #F4F9F9;
  --color-neutral-100: #E5EEEE;
  --color-neutral-200: #C8D8D8;
  --color-neutral-300: #A3BEBE;
  --color-neutral-400: #7A9E9E;
  --color-neutral-500: #5A7E7E;
  --color-neutral-600: #426060;
  --color-neutral-700: #2E4444;
  --color-neutral-800: #1C2C2C;
  --color-neutral-900: #111A1A;

  /* ── Color: Semantic ── */
  --color-success-100: #C8EDD8;
  --color-success-500: #1A7A4E;
  --color-success-600: #146040;
  --color-warning-100: #FDECD5;
  --color-warning-400: #D97B35;
  --color-warning-600: #A85A18;
  --color-error-100: #F8CCCC;
  --color-error-500: #C83030;
  --color-error-600: #A02020;
  --color-info-100: #C8E0EE;
  --color-info-500: #1A6A9A;
  --color-purple-100: #E2D8F0;
  --color-purple-500: #7A5EA0;

  /* ── Color: Mode-specific surfaces ── */
  --color-warm-white: #FFFAF6;
  --color-page-dark:  #041A1A;
  --color-card-dark:  #072E2E;
  --color-elevated-dark: #0A4444;
  --color-border-dark: #0F5E5E;

  /* ── Typography ── */
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.25rem;
  --text-2xl:   1.5rem;
  --text-3xl:   1.875rem;
  --text-4xl:   2.25rem;
  --text-5xl:   3rem;

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

  --leading-tight:   1.15;
  --leading-snug:    1.25;
  --leading-normal:  1.5;
  --leading-relaxed: 1.6;

  --tracking-tight:  -0.02em;
  --tracking-normal: 0em;
  --tracking-wide:   0.05em;
  --tracking-wider:  0.08em;
  --tracking-widest: 0.1em;

  /* ── Border radius ── */
  --radius-sm:  0.25rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;
  --radius-2xl: 1.5rem;

  /* ── Shadows ── */
  --shadow-card-sm:   0 1px 3px rgba(7,46,46,0.10);
  --shadow-card-md:   0 2px 10px rgba(4,26,26,0.14);
  --shadow-card-lg:   0 4px 20px rgba(4,26,26,0.18);
  --shadow-copper-dark:  0 0 24px rgba(240,120,64,0.30), 0 2px 10px rgba(4,26,26,0.70);
  --shadow-copper-light: 0 0 16px rgba(224,96,40,0.20), 0 2px 8px rgba(0,0,0,0.08);
}

/* ── Base layer ── */
@layer base {
  *, *::before, *::after {
    box-sizing: border-box;
  }

  body {
    margin: 0;
    font-family: var(--font-body);
    font-weight: var(--font-weight-regular);
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}

/* ── Light mode (default) ── */
:root {
  --bg-page:       var(--color-neutral-50);
  --bg-card:       var(--color-neutral-0);
  --bg-elevated:   var(--color-neutral-100);
  --text-heading:  #0A3030;
  --text-primary:  var(--color-neutral-800);
  --text-secondary:var(--color-neutral-500);
  --text-muted:    var(--color-neutral-400);
  --border-color:  var(--color-neutral-200);
  --border-subtle: rgba(200,216,216,0.7);
  --brand:         var(--color-teal-600);
  --brand-hover:   var(--color-teal-700);
  --accent:        var(--color-tng-500);
  --accent-text:   var(--color-tng-500);
  --accent-glow:   var(--shadow-copper-light);
  --row-hover:     rgba(20,122,122,0.04);
}

/* ── Dark mode ── */
.dark {
  --bg-page:       var(--color-page-dark);
  --bg-card:       var(--color-card-dark);
  --bg-elevated:   var(--color-elevated-dark);
  --text-heading:  var(--color-warm-white);
  --text-primary:  #F0F4F4;
  --text-secondary:var(--color-teal-300);
  --text-muted:    #5A8080;
  --border-color:  var(--color-border-dark);
  --border-subtle: rgba(15,94,94,0.45);
  --brand:         var(--color-teal-400);
  --brand-hover:   #1A8A8A;
  --accent:        var(--color-tng-400);
  --accent-text:   var(--color-tng-300);
  --accent-glow:   var(--shadow-copper-dark);
  --row-hover:     rgba(46,163,163,0.06);
}