:root {
  /* ink — now the default ground */
  --ink-ground:         #141922;
  --ink-ground-deep:    #090C11;
  --ink-surface:        #1B2129;
  --ink-hairline:       #2A313D;
  --ink-text-heading:   #EDEFF3;
  --ink-text-body:      #A8AEB8;
  --ink-text-muted:     #8B929E;
  --ink-text-max:       #FFFFFF;

  /* paper — now reserved for evidence panels only */
  --paper-ground:       #F7F5F0;
  --paper-surface:      #FFFFFF;
  --paper-hairline:     #C9C4BA;
  --paper-text-heading: #12161F;
  --paper-text-body:    #3A3F47;
  --paper-text-muted:   #5C616A;

  /* type */
  --type-lead:          21px;
  --type-body:          17px;

  /* interactive */
  --link:               #EDEFF3;

  /* media */
  --media-well:         #0A0D12;
  --media-bezel:        #1A1A1A;
  --media-fade:         #FFFFFF;
  /* RGB components must always match --media-fade */
  --media-fade-transparent: rgba(255, 255, 255, 0);
  --media-scroll-thumb: rgba(15, 19, 26, 0.3);

  /* defined for a later pass — do not apply yet */
  --grid-pitch:         24px;
  --grid-dot-size:      1px;
  --grid-dot-ink:       rgba(237, 239, 243, 0.07);
  --grid-dot-paper:     rgba(15, 19, 26, 0.13);
}

/* Proposition brief — reusable case-study header panel */
.proposition-brief { border: 1px solid var(--ink-hairline); padding: 36px 40px; }
.proposition-brief__eyebrow { font-size: 12px; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-text-muted); margin: 0; }
.proposition-brief__body { font-size: 15px; line-height: 1.65; color: var(--ink-text-muted); margin: 20px 0 0 0; max-width: 72ch; }
.proposition-brief__body + .proposition-brief__body { margin-top: 14px; }
.proposition-brief__stages { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin-top: 32px; }
.proposition-brief__stages--stacked { grid-template-columns: 1fr; gap: 0; }
.proposition-brief__stage { border-top: 2px solid var(--ink-hairline); padding-top: 10px; }
.proposition-brief__stages--stacked .proposition-brief__stage { padding: 10px 0 12px 0; display: flex; gap: 12px; align-items: baseline; }
.proposition-brief__stage-num { font-size: 11px; color: var(--ink-text-muted); margin: 0; }
.proposition-brief__stage-name { font-size: 13px; font-weight: 600; color: var(--ink-text-muted); margin: 4px 0 0 0; line-height: 1.35; }
.proposition-brief__stages--stacked .proposition-brief__stage-name { margin: 0; }
.proposition-brief__stage--active { border-top-color: var(--ink-text-heading); }
.proposition-brief__stage--active .proposition-brief__stage-num,
.proposition-brief__stage--active .proposition-brief__stage-name { color: var(--ink-text-heading); }
.proposition-brief__foot { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; margin-top: 14px; flex-wrap: wrap; }
.proposition-brief__coverage { font-size: 12px; font-style: italic; color: var(--ink-text-muted); margin: 0; }
.proposition-brief__link { font-size: 13px; color: var(--link); }