/* ============================================================
 * Covalent Bio — Design Tokens
 * Single source of truth for color / type / space / motion.
 * ============================================================ */

:root {
  /* ── Color ─────────────────────────────────────────────── */
  --color-ink:           #1A1A1A;
  --color-ink-2:         #3A3A3A;
  --color-ink-3:         #6B7280;
  --color-ink-muted:     #9CA3AF;

  --color-ivory:         #F8F6F1;
  --color-ivory-2:       #F1EEE6;
  --color-paper:         #FFFFFF;

  --color-teal:          #0F4C5C;
  --color-teal-d:        #0A3742;
  --color-teal-l:        #5B8A95;
  --color-teal-wash:     #E8EEF0;

  --color-amber:         #C68B3E;
  --color-amber-l:       #E0B070;
  --color-amber-wash:    #F5EBD8;

  --color-emerald:       #10B981;
  --color-rust:          #B45309;
  --color-border:        #E5E1D6;
  --color-border-soft:   #EFEBE0;

  /* ── Category dots ─────────────────────────────────────── */
  --cat-recovery:    #10B981;
  --cat-growth:      #3B82F6;
  --cat-weight-loss: #F59E0B;
  --cat-longevity:   #8B5CF6;
  --cat-cognitive:   #EC4899;
  --cat-tanning:     #F97316;
  --cat-immune:      #14B8A6;
  --cat-hormonal:    #EF4444;
  --cat-metabolic:   #06B6D4;
  --cat-gut-health:  #84CC16;
  --cat-sleep:       #6366F1;
  --cat-skincare:    #D946EF;
  --cat-blend:       #0F4C5C;
  --cat-supply:      #6B7280;

  /* ── Type ──────────────────────────────────────────────── */
  --font-display: "Instrument Serif", "GT Sectra", Georgia, serif;
  --font-body:    "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:    "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  /* Fluid type scale */
  --fs-12:  0.75rem;
  --fs-14:  0.875rem;
  --fs-16:  1rem;
  --fs-18:  1.125rem;
  --fs-20:  1.25rem;
  --fs-24:  1.5rem;
  --fs-30:  clamp(1.5rem, 1.2rem + 1vw, 1.875rem);
  --fs-36:  clamp(1.875rem, 1.5rem + 1.5vw, 2.5rem);
  --fs-48:  clamp(2.25rem, 1.8rem + 2vw, 3.5rem);
  --fs-72:  clamp(3rem, 2rem + 4vw, 6rem);

  --lh-tight: 1.05;
  --lh-snug:  1.2;
  --lh-base:  1.5;
  --lh-loose: 1.7;

  --tracking-mono: 0.04em;
  --tracking-wide: 0.12em;

  /* ── 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-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;
  --sp-32: 8rem;

  --gutter:    clamp(1.25rem, 4vw, 3rem);
  --max-w:     1320px;
  --max-w-text: 64ch;

  /* ── Radius ────────────────────────────────────────────── */
  --r-1: 2px;
  --r-2: 4px;
  --r-3: 8px;
  --r-4: 16px;
  --r-full: 999px;

  /* ── Shadow / depth ────────────────────────────────────── */
  --shadow-1: 0 1px 2px rgba(15, 76, 92, 0.04);
  --shadow-2: 0 2px 12px rgba(15, 76, 92, 0.08);
  --shadow-3: 0 12px 40px rgba(15, 76, 92, 0.12);
  --shadow-ring: 0 0 0 1px var(--color-border);

  /* ── Motion ────────────────────────────────────────────── */
  --ease-out:   cubic-bezier(0.22, 1, 0.36, 1);
  --ease-inout: cubic-bezier(0.65, 0, 0.35, 1);
  --t-fast:   140ms;
  --t-base:   220ms;
  --t-slow:   480ms;

  /* ── Z ─────────────────────────────────────────────────── */
  --z-nav:    50;
  --z-modal:  100;
  --z-toast:  200;
}

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