:root{
  /* ---- Grounds ---------------------------------------------------------- */
  --mo-ultra:      #0A0085;  /* ultramarine, the brand moment */
  --mo-ultra-lo:   #06003E;  /* deep indigo, the transition band */
  --mo-midnight:   #04021A;  /* default working surface */
  --mo-mint:       #D1F1D9;  /* the one light band per page */
  --mo-cream:      #FFF6E9;  /* warm paper, solid-button hover */
  --mo-white:      #FFFFFF;

  /* ---- Accents (position and signal only, never fills) ------------------ */
  --mo-amber:      #E08A2B;  /* active nav, current section, one link */
  --mo-teal:       #7FD9CE;  /* button badge, sphere highlight */
  --mo-alert:      #FF7A6B;  /* "don't" labels in documentation only */

  /* ---- Sphere ramp (gradients exist only inside a circle) --------------- */
  --mo-sp-coral:   #F2884A;
  --mo-sp-teal:    #7FD9CE;
  --mo-sp-lilac:   #B9A7F5;
  --mo-sp-blue:    #2A1FD6;
  --mo-sp-magenta: #C4529B;
  --mo-sp-warm:    #FFD9A8;

  /* ---- Foreground on dark ---------------------------------------------- */
  --mo-fg-1: #FFFFFF;
  --mo-fg-2: rgba(255,255,255,.68);
  --mo-fg-3: rgba(255,255,255,.42);
  --mo-line: rgba(255,255,255,.16);
  --mo-line-soft: rgba(255,255,255,.09);

  /* ---- Foreground on light --------------------------------------------- */
  --mo-ink-1: #04021A;
  --mo-ink-2: rgba(4,2,26,.66);
  --mo-ink-3: rgba(4,2,26,.40);
  --mo-ink-line: rgba(4,2,26,.16);

  /* ---- Semantic aliases ------------------------------------------------ */
  --mo-surface:          var(--mo-midnight);
  --mo-surface-brand:    var(--mo-ultra);
  --mo-surface-relief:   var(--mo-mint);
  --mo-surface-card:     rgba(255,255,255,.045);
  --mo-surface-card-lt:  rgba(255,255,255,.5);
  --mo-surface-media:    #120E2E;
  --mo-text-primary:     var(--mo-fg-1);
  --mo-text-body:        var(--mo-fg-2);
  --mo-text-muted:       var(--mo-fg-3);
  --mo-border:           var(--mo-line);
  --mo-border-soft:      var(--mo-line-soft);
  --mo-accent-position:  var(--mo-amber);
  --mo-accent-badge:     var(--mo-teal);

  /* ---- Legacy (secondary) system --------------------------------------
     The previous navy / cream / coral Momentum palette. Kept for existing
     collateral only. Do not mix with the grounds above in one piece. */
  --mo-legacy-navy:   #0C1828;
  --mo-legacy-cream:  #EEEADE;
  --mo-legacy-coral:  #E8453C;
  --mo-legacy-purple: #3D1C6E;
}