.proof-r2{--p-ink:#0d0d0d;--p-paper:#fff;--p-soft:#b5b5b5;padding-bottom:5rem}
.proof-r2 .r2p-intro{display:grid;grid-template-columns:1.25fr .75fr;gap:3rem;align-items:end;padding:3.8rem 0 3.5rem}
.proof-r2 .r2p-intro h1{font-size:clamp(2.6rem,4.7vw,4.5rem);font-weight:550;line-height:1.05;letter-spacing:-.065em;margin:1.1rem 0 0}
.proof-r2 .r2p-intro .lead{font-size:1rem;line-height:1.75;max-width:440px;margin:0 0 .1rem;color:var(--p-soft)}
.proof-r2 .r2p-gallery-heading{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;padding:0 0 1.1rem}
.proof-r2 .r2p-gallery-heading h2{font-size:clamp(1.35rem,2.2vw,1.8rem);font-weight:500;line-height:1.2;letter-spacing:-.035em;margin:0}
.proof-r2 .r2p-controls{display:flex;align-items:center;gap:.8rem;flex-shrink:0}
.proof-r2 .r2p-controls button{width:44px;height:44px;padding:0;border:1px solid #555;background:transparent;color:#fff;align-items:center;justify-content:center;cursor:pointer}
.proof-r2 .r2p-controls button:not([hidden]){display:inline-flex}
.proof-r2 .r2p-controls button:disabled{opacity:.35;cursor:default}
.proof-r2 .r2p-controls button:not(:disabled):hover{background:#fff;color:#0d0d0d}
.proof-r2 .r2p-scroll-hint,.proof-r2 .r2p-count{font-size:.7rem;white-space:nowrap;color:var(--p-soft)}
.proof-r2 .r2p-count{min-width:4rem;text-align:center;font-variant-numeric:tabular-nums;letter-spacing:.05em;color:#fff}
.proof-r2 .r2p-disclosure{font-size:.75rem;line-height:1.6;color:var(--p-soft);max-width:770px;margin:.95rem 0 1.5rem}
/* The browser owns wheel and touch movement. There is no forced landing point. */
.proof-r2 .scenario-track{display:flex;gap:1.25rem;overflow-x:auto;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;scroll-snap-type:none;list-style:none;margin:0;padding:0 0 1.15rem;scrollbar-width:thin;scrollbar-color:#777 #242424;align-items:stretch;touch-action:auto}
.proof-r2 .scenario-track::-webkit-scrollbar{height:5px}
.proof-r2 .scenario-track::-webkit-scrollbar-track{background:#242424}
.proof-r2 .scenario-track::-webkit-scrollbar-thumb{background:#777}
.proof-r2 .r2p-card{flex:0 0 auto;min-width:0;box-sizing:border-box;overflow-wrap:break-word}
.proof-r2 .r2p-card h3{font-weight:550;line-height:1.12;letter-spacing:-.045em;margin:0 0 1.2rem}
.proof-r2 .r2p-card p{margin-top:0}
.proof-r2 .r2p-card dl{margin:0}
.proof-r2 .r2p-card dd{margin:0;font-size:.9rem;line-height:1.65}
.proof-r2 .r2p-topic,.proof-r2 .r2p-small,.proof-r2 .r2p-illustrative,.proof-r2 .r2p-field dt{font-size:.65rem;font-weight:500;line-height:1.4;letter-spacing:.065em;text-transform:uppercase}
.proof-r2 .r2p-topic{margin-bottom:.85rem;color:#666}
.proof-r2 .r2p-small{margin-bottom:.9rem}
.proof-r2 .r2p-field dt{margin-bottom:.55rem}
.proof-r2 .r2p-situation{font-size:1rem;line-height:1.65;margin-bottom:1.4rem}
.proof-r2 .r2p-card-top{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.proof-r2 .r2p-index{font-variant-numeric:tabular-nums;font-size:1.2rem;line-height:1;letter-spacing:-.055em;font-weight:400}
.proof-r2 .r2p-references{display:flex;flex-wrap:wrap;gap:.55rem 1rem}
.proof-r2 .r2p-references a{font-size:.69rem;line-height:1.6;text-decoration:underline;text-decoration-color:#888;text-underline-offset:4px;color:inherit;max-width:100%}
.proof-r2 .r2p-references a:hover{text-decoration-color:currentColor}
.proof-r2 .r2p-references .icon{width:.8rem;height:.8rem}
.proof-r2 .r2p-controls button:focus-visible,.proof-r2 .scenario-track:focus-visible,.proof-r2 .r2p-references a:focus-visible{outline:2px solid currentColor;outline-offset:5px}
.proof-r2 .r2p-closing{display:flex;align-items:center;justify-content:space-between;gap:3rem;border-top:1px solid #333;padding-top:2.5rem;margin-top:3rem}
.proof-r2 .r2p-closing h2{font-size:clamp(1.9rem,3vw,2.8rem);font-weight:500;line-height:1.12;letter-spacing:-.05em;margin:.9rem 0 1rem}
.proof-r2 .r2p-closing p:not(.eyebrow){font-size:.95rem;line-height:1.7;color:var(--p-soft);max-width:580px;margin:0}
.proof-r2 .r2p-closing-actions{display:flex;flex-direction:column;align-items:flex-start;gap:1.2rem;flex-shrink:0}
.proof-r2 .r2p-closing-actions .text-link{font-size:.82rem}

/* Story cards flow as prose, with a contrasting final paragraph. */
.proof-r2-1 .r2p-card{width:calc((100% - 1.25rem)/2);background:var(--p-paper);color:var(--p-ink);display:flex;flex-direction:column}
.proof-r2-1 .r2p-story-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.8rem;border-bottom:1px solid #dedede}
.proof-r2-1 .r2p-story-header .r2p-illustrative{color:#666}
.proof-r2-1 .r2p-story-main{padding:1.8rem}
.proof-r2-1 .r2p-card h3{font-size:2rem;max-width:470px}
.proof-r2-1 .r2p-situation{font-size:1rem;color:#333;margin-bottom:1.6rem}
.proof-r2-1 .r2p-story-prose{font-size:.89rem;line-height:1.7;color:#333;margin-bottom:1rem}
.proof-r2-1 .r2p-story-prose:last-child{margin-bottom:0}
.proof-r2-1 .r2p-story-prose>span{display:block;font-size:.67rem;line-height:1.5;text-transform:uppercase;letter-spacing:.065em;margin-bottom:.4rem;color:#666}
.proof-r2-1 .r2p-story-tail{background:#171717;color:#fff;padding:1.5rem 1.8rem;margin:0 .65rem .65rem;margin-top:auto}
.proof-r2-1 .r2p-story-tail .r2p-story-prose{color:#ddd;font-size:.84rem;margin-bottom:1.2rem}
.proof-r2-1 .r2p-story-tail .r2p-story-prose>span{color:#b5b5b5}
.proof-r2-1 .r2p-story-tail .r2p-references{color:#bbb}

/* A white business page faces a dark page for the proposed technical work. */
.proof-r2-2 .r2p-card{width:89%;display:grid;grid-template-columns:1fr 1fr;background:#171717;border:1px solid #3d3d3d}
.proof-r2-2 .r2p-business-side{background:#fff;color:#0d0d0d;padding:2rem 2.3rem;display:flex;align-items:flex-start;flex-direction:column}
.proof-r2-2 .r2p-card-top{width:100%;margin-bottom:3rem}
.proof-r2-2 .r2p-card-top .r2p-index{font-size:2.5rem}
.proof-r2-2 .r2p-card h3{font-size:clamp(1.8rem,3.2vw,3rem);max-width:440px}
.proof-r2-2 .r2p-situation{font-size:1rem;color:#444;margin-bottom:1.5rem}
.proof-r2-2 .r2p-spread-direction{margin-top:auto;padding-top:1rem}
.proof-r2-2 .r2p-spread-direction svg{width:2rem;height:2rem}
.proof-r2-2 .r2p-work-side{padding:2.3rem;display:flex;flex-direction:column}
.proof-r2-2 .r2p-work-side>.r2p-small{color:#aaa;padding-bottom:1rem;border-bottom:1px solid #444;margin-bottom:1.8rem}
.proof-r2-2 .r2p-field{margin-bottom:1.6rem}
.proof-r2-2 .r2p-field dt{color:#b5b5b5}
.proof-r2-2 .r2p-field dd{font-size:.94rem;color:#ededed}
.proof-r2-2 .r2p-references{margin-top:auto;padding-top:.5rem;color:#bbb}

/* A broad journey uses position and numbering, with no colour assigned to stages. */
.proof-r2-3 .r2p-card{width:92%;background:#fff;color:#0d0d0d;padding:2rem 2.2rem}
.proof-r2-3 .r2p-journey-header{display:flex;align-items:start;justify-content:space-between;gap:2rem}
.proof-r2-3 .r2p-card h3{font-size:2.4rem;max-width:600px}
.proof-r2-3 .r2p-journey-label{display:flex;flex-direction:column;align-items:flex-end;gap:.8rem;min-width:130px}
.proof-r2-3 .r2p-journey-label .r2p-index{font-size:3.5rem}
.proof-r2-3 .r2p-journey-label .r2p-illustrative{color:#666}
.proof-r2-3 .r2p-journey-start{display:grid;grid-template-columns:150px 1fr;gap:1rem;margin:.5rem 0 2rem;max-width:800px}
.proof-r2-3 .r2p-journey-start .r2p-small{margin-top:.25rem;color:#666}
.proof-r2-3 .r2p-journey-start .r2p-situation{font-size:.98rem;color:#444;margin:0}
.proof-r2-3 .r2p-journey-steps{display:grid;grid-template-columns:1fr 1fr 1fr;gap:0;background:#111;color:#fff;padding:1.6rem 0}
.proof-r2-3 .r2p-journey-steps .r2p-field{padding:0 1.5rem;border-right:1px solid #444}
.proof-r2-3 .r2p-journey-steps .r2p-field:last-child{border-right:0}
.proof-r2-3 .r2p-journey-steps dt{color:#b5b5b5;margin-bottom:1rem}
.proof-r2-3 .r2p-journey-steps dd{font-size:.86rem;line-height:1.7;color:#e1e1e1}
.proof-r2-3 .r2p-journey-foot{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-top:1.5rem;color:#555}
.proof-r2-3 .r2p-journey-foot>.r2p-small{margin:0}

/* Questions break up a dark cover and a white reading panel. */
.proof-r2-4 .r2p-card{width:calc((100% - 1.25rem)/2);border:1px solid #555;display:flex;flex-direction:column;background:#171717}
.proof-r2-4 .r2p-question-header{padding:1.5rem 1.8rem 1.8rem}
.proof-r2-4 .r2p-card-top{margin-bottom:1.8rem;color:#b5b5b5}
.proof-r2-4 .r2p-card-top .r2p-index{font-size:1.8rem}
.proof-r2-4 .r2p-topic{color:#b5b5b5}
.proof-r2-4 .r2p-card h3{font-size:2.1rem;margin:0;max-width:460px}
.proof-r2-4 .r2p-question-opening{padding:1.4rem 1.8rem 0;background:#fff;color:#111}
.proof-r2-4 .r2p-question-opening .r2p-small{color:#666;margin-bottom:.55rem}
.proof-r2-4 .r2p-situation{font-size:.95rem;margin-bottom:0}
.proof-r2-4 .r2p-question-detail{padding:1.4rem 1.8rem;background:#fff;color:#111}
.proof-r2-4 .r2p-question-detail .r2p-field{border-top:1px solid #d5d5d5;padding-top:1rem;margin-bottom:1rem}
.proof-r2-4 .r2p-question-detail .r2p-field:last-child{margin:0}
.proof-r2-4 .r2p-question-detail dt{color:#666}
.proof-r2-4 .r2p-question-detail dd{font-size:.87rem;color:#333}
.proof-r2-4 .r2p-question-tail{padding:1.4rem 1.8rem;margin-top:auto}
.proof-r2-4 .r2p-question-tail dt{color:#b5b5b5}
.proof-r2-4 .r2p-question-tail dd{font-size:.82rem;color:#ddd}
.proof-r2-4 .r2p-question-tail .r2p-references{margin-top:1.2rem;color:#b5b5b5}

/* Compact ruled cards retain the density of the preferred first-round layout. */
.proof-r2-5 .r2p-card{width:calc((100% - 1.25rem)/2);background:#fff;color:#0d0d0d;display:flex;flex-direction:column;padding:1.7rem 1.8rem 0}
.proof-r2-5 .r2p-card-top{margin-bottom:1.7rem}
.proof-r2-5 .r2p-card-top .r2p-illustrative{color:#666}
.proof-r2-5 .r2p-card-top .r2p-index{background:#111;color:#fff;width:43px;height:43px;display:flex;align-items:center;justify-content:center;font-size:1.25rem}
.proof-r2-5 .r2p-card h3{font-size:1.95rem;max-width:450px;margin-bottom:1.4rem}
.proof-r2-5 .r2p-example-detail{border-top:1px solid #222}
.proof-r2-5 .r2p-field{display:grid;grid-template-columns:108px 1fr;gap:1.1rem;border-bottom:1px solid #ddd;padding:1.05rem 0}
.proof-r2-5 .r2p-field dt{margin:0;color:#666;padding-top:.15rem}
.proof-r2-5 .r2p-field dd{font-size:.84rem;color:#333;line-height:1.6}
.proof-r2-5 .r2p-example-foot{padding:1.3rem 0 1.5rem;margin-top:auto}
.proof-r2-5 .r2p-example-foot>.r2p-small{display:none}
.proof-r2-5 .r2p-references{color:#555}

@media(max-width:1000px){
  .proof-r2 .r2p-intro{gap:2rem;grid-template-columns:1.15fr .85fr}
  .proof-r2 .r2p-intro h1{font-size:3.1rem}
  .proof-r2 .r2p-scroll-hint{display:none}
  .proof-r2-1 .r2p-card,.proof-r2-4 .r2p-card,.proof-r2-5 .r2p-card{width:65%}
  .proof-r2-2 .r2p-card{width:94%}
  .proof-r2-2 .r2p-business-side,.proof-r2-2 .r2p-work-side{padding:1.8rem}
  .proof-r2-3 .r2p-journey-steps .r2p-field{padding:0 1.15rem}
}
@media(max-width:700px){
  .proof-r2{padding-bottom:3rem}
  .proof-r2 .r2p-intro{grid-template-columns:1fr;gap:1.4rem;padding:2.5rem 0 2.2rem}
  .proof-r2 .r2p-intro h1{font-size:clamp(2.15rem,8.5vw,3.7rem);line-height:1.06;margin-top:.8rem;letter-spacing:-.06em}
  .proof-r2 .r2p-intro .lead{font-size:.92rem;line-height:1.65;max-width:520px}
  .proof-r2 .r2p-gallery-heading{align-items:center;gap:.8rem;padding-bottom:.9rem}
  .proof-r2 .r2p-gallery-heading h2{font-size:1.18rem;max-width:53%}
  .proof-r2 .r2p-controls{gap:.25rem}
  .proof-r2 .r2p-controls button{width:44px;height:44px}
  .proof-r2 .r2p-count{min-width:3.1rem;font-size:.63rem}
  .proof-r2 .r2p-disclosure{font-size:.7rem;line-height:1.6;margin:.8rem 0 1.1rem}
  .proof-r2 .scenario-track{gap:.8rem;padding-bottom:.9rem}
  .proof-r2 .r2p-card{width:94%}
  .proof-r2 .r2p-card h3{font-size:1.65rem;line-height:1.15}
  .proof-r2 .r2p-topic,.proof-r2 .r2p-small,.proof-r2 .r2p-illustrative,.proof-r2 .r2p-field dt{font-size:.59rem}
  .proof-r2 .r2p-card dd{font-size:.84rem;line-height:1.6}
  .proof-r2 .r2p-situation{font-size:.88rem;line-height:1.6}
  .proof-r2 .r2p-references a{font-size:.63rem;line-height:1.6}
  .proof-r2 .r2p-closing{flex-direction:column;align-items:flex-start;gap:1.6rem;margin-top:2rem;padding-top:2rem}
  .proof-r2 .r2p-closing p:not(.eyebrow){font-size:.88rem}
  .proof-r2 .r2p-closing h2{font-size:2rem}
  .proof-r2-1 .r2p-story-header{padding:1rem 1.25rem}
  .proof-r2-1 .r2p-story-main{padding:1.4rem 1.25rem}
  .proof-r2-1 .r2p-situation{font-size:.9rem;margin-bottom:1.25rem}
  .proof-r2-1 .r2p-story-prose{font-size:.84rem;line-height:1.65;margin-bottom:1rem}
  .proof-r2-1 .r2p-story-prose>span{font-size:.59rem}
  .proof-r2-1 .r2p-story-tail{padding:1.2rem;margin:0 .5rem .5rem;margin-top:auto}
  .proof-r2-1 .r2p-story-tail .r2p-story-prose{font-size:.82rem}
  .proof-r2-2 .r2p-card{grid-template-columns:1fr}
  .proof-r2-2 .r2p-business-side,.proof-r2-2 .r2p-work-side{padding:1.3rem}
  .proof-r2-2 .r2p-card-top{margin-bottom:1.2rem}
  .proof-r2-2 .r2p-card-top .r2p-index{font-size:1.7rem}
  .proof-r2-2 .r2p-card h3{font-size:1.85rem;margin-bottom:1rem}
  .proof-r2-2 .r2p-situation{font-size:.88rem;margin-bottom:0}
  .proof-r2-2 .r2p-spread-direction{display:none}
  .proof-r2-2 .r2p-work-side>.r2p-small{padding-bottom:.8rem;margin-bottom:1rem}
  .proof-r2-2 .r2p-field{margin-bottom:1.15rem}
  .proof-r2-2 .r2p-field dd{font-size:.84rem}
  .proof-r2-2 .r2p-references{padding-top:0}
  .proof-r2-3 .r2p-card{padding:1.3rem}
  .proof-r2-3 .r2p-journey-header{gap:.7rem}
  .proof-r2-3 .r2p-card h3{font-size:1.7rem;margin-bottom:1rem}
  .proof-r2-3 .r2p-journey-label{min-width:0}
  .proof-r2-3 .r2p-journey-label .r2p-index{font-size:1.8rem}
  .proof-r2-3 .r2p-journey-label .r2p-illustrative{max-width:64px;font-size:.52rem;text-align:right}
  .proof-r2-3 .r2p-journey-start{grid-template-columns:1fr;gap:0;margin:.4rem 0 1.3rem}
  .proof-r2-3 .r2p-journey-start .r2p-small{margin-bottom:.5rem}
  .proof-r2-3 .r2p-journey-start .r2p-situation{font-size:.87rem}
  .proof-r2-3 .r2p-journey-steps{grid-template-columns:1fr;padding:0 1rem}
  .proof-r2-3 .r2p-journey-steps .r2p-field{padding:1.1rem 0;border-right:0;border-bottom:1px solid #444}
  .proof-r2-3 .r2p-journey-steps .r2p-field:last-child{border-bottom:0}
  .proof-r2-3 .r2p-journey-steps dt{margin-bottom:.6rem}
  .proof-r2-3 .r2p-journey-steps dd{font-size:.82rem;line-height:1.65}
  .proof-r2-3 .r2p-journey-foot{align-items:flex-start;flex-direction:column;padding-top:1.2rem;gap:.65rem}
  .proof-r2-4 .r2p-question-header{padding:1.15rem 1.25rem 1.4rem}
  .proof-r2-4 .r2p-card-top{margin-bottom:1.2rem}
  .proof-r2-4 .r2p-card-top .r2p-index{font-size:1.4rem}
  .proof-r2-4 .r2p-question-opening{padding:1.15rem 1.25rem 0}
  .proof-r2-4 .r2p-situation{font-size:.87rem}
  .proof-r2-4 .r2p-question-detail{padding:1.15rem 1.25rem}
  .proof-r2-4 .r2p-question-detail dd{font-size:.83rem}
  .proof-r2-4 .r2p-question-tail{padding:1.15rem 1.25rem}
  .proof-r2-4 .r2p-question-tail dd{font-size:.8rem}
  .proof-r2-5 .r2p-card{padding:1.2rem 1.25rem 0}
  .proof-r2-5 .r2p-card-top{margin-bottom:1.2rem}
  .proof-r2-5 .r2p-card-top .r2p-index{width:36px;height:36px;font-size:1.15rem}
  .proof-r2-5 .r2p-card h3{font-size:1.65rem;margin-bottom:1.2rem}
  .proof-r2-5 .r2p-field{grid-template-columns:1fr;gap:.4rem;padding:.9rem 0}
  .proof-r2-5 .r2p-field dt{padding:0}
  .proof-r2-5 .r2p-field dd{font-size:.82rem;line-height:1.6}
  .proof-r2-5 .r2p-example-foot{padding:1.1rem 0 1.3rem}
}
@media(prefers-reduced-motion:reduce){.proof-r2 .scenario-track{scroll-behavior:auto}}

.proof-r2-4 .r2p-question-opening,.proof-r2-4 .r2p-question-detail{--muted:#444;--ink:#111;--focus:#111;--bg:#fff}