.proof-shell{max-width:1380px;margin:0 auto;padding:clamp(40px,6vw,86px) clamp(20px,4vw,56px) 90px;color:var(--text)}
.proof-shell__intro{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);align-items:end;gap:clamp(24px,5vw,80px);margin-bottom:clamp(28px,4vw,54px)}
.proof-shell__eyebrow{font:600 11px/1.5 'IBM Plex Mono',monospace;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin:0 0 18px}
.proof-shell h1,.proof-shell h2{font-family:Anton,sans-serif;font-weight:400;text-transform:uppercase;letter-spacing:.01em;text-wrap:balance;margin:0}
.proof-shell h1{font-size:clamp(50px,6.2vw,88px);line-height:.96;max-width:850px}
.proof-shell h2{font-size:clamp(50px,6vw,82px);line-height:.98;max-width:850px}
.proof-shell h1 span{display:block;color:var(--accent)}
.proof-shell__pitch{border-left:2px solid var(--accent);padding-left:clamp(18px,2.3vw,32px)}
.proof-shell__pitch strong{display:block;font-size:clamp(20px,2vw,30px);font-weight:750;line-height:1.22;text-wrap:balance;max-width:400px}
.proof-shell__pitch p{font-size:15px;line-height:1.55;color:var(--muted);max-width:440px;margin:14px 0 24px;text-wrap:pretty}
.proof-shell__cta{display:inline-flex;align-items:center;justify-content:center;min-height:48px;border:1px solid var(--action);background:var(--action);color:#fff;padding:12px 20px;cursor:pointer;font:600 11px/1.4 'IBM Plex Mono',monospace;letter-spacing:.09em;text-transform:uppercase;transition:transform .2s ease,background .2s ease}
.proof-shell__cta:hover{transform:translateY(-3px);background:#c94c1d}
.proof-shell__cta:focus-visible,.proof-nav a:focus-visible,.proof-visual__decision button:focus-visible{outline:3px solid #f9a168;outline-offset:4px}
.proof-shell__bridge{display:flex;justify-content:space-between;align-items:baseline;gap:15px;border-top:1px solid var(--line);margin:0 0 18px;padding-top:15px;font:600 10px/1.4 'IBM Plex Mono',monospace;letter-spacing:.15em;text-transform:uppercase;color:var(--muted)}
.proof-shell__bridge span:last-child{color:var(--accent)}
holding-proof{display:grid;grid-template-columns:minmax(0,1.22fr) minmax(300px,.78fr);grid-template-areas:'visual chapters';align-items:start;column-gap:clamp(24px,4vw,58px);position:relative}
/* Editorial composition: photo window and evidence above one shared axis; message and shipper gate below it. */
.proof-stage{grid-area:visual;position:sticky;top:var(--proof-top,92px);z-index:2;background:#1b1a18;color:#f3efe7;box-shadow:0 22px 50px rgba(20,18,15,.18)}
.proof-visual{position:relative;overflow:hidden;isolation:isolate;height:max(470px,min(clamp(500px,46vw,620px),calc(100svh - var(--proof-top,92px) - 64px)));display:grid;grid-template-columns:minmax(0,1fr) minmax(170px,.5fr);grid-template-rows:auto minmax(0,1fr) 112px auto;grid-template-areas:'top top' 'window evidence' 'axis axis' 'message gate';gap:12px 22px;padding:20px 24px 22px;background:#1b1a18;color:#f3efe7}
.proof-visual__top{grid-area:top;display:flex;justify-content:space-between;gap:12px;font:600 10px/1.4 'IBM Plex Mono',monospace;letter-spacing:.12em;text-transform:uppercase;color:#bdb6aa}
.proof-visual__counter{color:#f37c45;white-space:nowrap}
.proof-visual__window{grid-area:window;position:relative;margin:0;min-height:0;overflow:hidden;background:#2a2824}
.proof-visual__photo,.proof-visual__shade{position:absolute;inset:0;width:100%;height:100%}
.proof-visual__photo{object-fit:cover;filter:grayscale(.35) contrast(1.05);opacity:.86;transition:clip-path .8s cubic-bezier(.22,1,.36,1),opacity .5s ease}
.proof-visual__photo--trial{clip-path:inset(100% 0 0 0)}
.proof-visual[data-step='1'] .proof-visual__photo--trial,.proof-visual[data-step='2'] .proof-visual__photo--trial,.proof-visual[data-step='3'][data-decision='evaluate'] .proof-visual__photo--trial{clip-path:inset(0)}
.proof-visual__shade{background:linear-gradient(180deg,transparent 55%,rgba(27,26,24,.72) 100%)}
.proof-visual__evidence{grid-area:evidence;align-self:end;display:grid;gap:6px;opacity:0;transform:translateY(8px);transition:opacity .45s,transform .45s}
.proof-visual__evidence span{border-top:1px solid #57524a;padding:9px 0 3px;color:#8d877d;font:600 10px/1.2 'IBM Plex Mono',monospace;letter-spacing:.08em;text-transform:uppercase;transition:color .4s,border-color .4s}
.proof-visual__evidence span:before{content:'○';color:#8d877d;margin-right:9px}
.proof-visual[data-step='1'] .proof-visual__evidence{opacity:.6;transform:none}
.proof-visual[data-step='2'] .proof-visual__evidence,.proof-visual[data-step='3'] .proof-visual__evidence{opacity:1;transform:none}
.proof-visual[data-step='2'] .proof-visual__evidence span,.proof-visual[data-step='3'] .proof-visual__evidence span{color:#f3efe7;border-color:#f37c45}
.proof-visual[data-step='2'] .proof-visual__evidence span:before,.proof-visual[data-step='3'] .proof-visual__evidence span:before{content:'✓';color:#f37c45}
.proof-visual__axis{grid-area:axis;position:relative;margin:0 -24px}
.proof-visual__axis svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;fill:none}
.proof-visual__baseline{stroke:#8d877d;stroke-width:2;vector-effect:non-scaling-stroke}
.proof-visual__track{stroke:#f37c45;stroke-width:1.5;stroke-dasharray:4 7;opacity:.5;vector-effect:non-scaling-stroke}
.proof-visual__trail{stroke:#ec5e27;stroke-width:4;stroke-linecap:round;stroke-dasharray:100;stroke-dashoffset:100}
.proof-visual__current,.proof-visual__xbf,.proof-visual__marksman{position:absolute;font:600 10px/1.35 'IBM Plex Mono',monospace;letter-spacing:.06em;text-transform:uppercase;max-width:150px;text-wrap:balance}
.proof-visual__current{left:9%;top:50%;margin-top:-7px;padding-top:22px;color:#cfc8bc}
.proof-visual__current:before{content:'';position:absolute;left:0;top:0;width:14px;height:14px;background:#a8a197;border:3px solid #1b1a18}
.proof-visual__xbf,.proof-visual__marksman{background:#1b1a18;padding:3px 7px;color:#f3efe7;opacity:0;transition:opacity .4s}
.proof-visual__xbf{left:30%;top:20%;transform:translateY(calc(-100% - 12px));border-left:2px solid #f37c45}
.proof-visual__marksman{right:14%;top:82%;transform:translateY(-50%);border-right:2px solid #f37c45;text-align:right}
.proof-visual[data-step='1'] .proof-visual__xbf,.proof-visual[data-step='2'] .proof-visual__xbf,.proof-visual[data-step='3'][data-decision='evaluate'] .proof-visual__xbf{opacity:1}
.proof-visual[data-step='3'][data-decision='integrate'] .proof-visual__marksman{opacity:1}
.proof-visual__candidate{position:absolute;left:0;top:0;margin:-15px 0 0 -15px;width:30px;height:30px;border:2px solid #f3efe7;background:#ec5e27;color:#fff;display:grid;place-items:center;opacity:0;transition:opacity .35s ease}
.proof-visual[data-step='1'] .proof-visual__candidate,.proof-visual[data-step='2'] .proof-visual__candidate,.proof-visual[data-step='3'] .proof-visual__candidate{opacity:1}
.proof-visual__candidate b{position:absolute;left:calc(100% + 10px);top:50%;transform:translateY(-50%);white-space:nowrap;background:#ec5e27;color:#fff;padding:4px 7px;font:600 10px/1.2 'IBM Plex Mono',monospace;letter-spacing:.04em}
.proof-visual[data-step='3'][data-decision='integrate'] .proof-visual__candidate b{left:auto;right:-8px;top:auto;bottom:calc(100% + 8px);transform:none}
.proof-visual__candidate:before{content:'+';font:700 20px/1 Arial,sans-serif}
.proof-visual__message{grid-area:message;align-self:start;max-width:560px}
.proof-visual__chapter-tag{font:600 10px/1.4 'IBM Plex Mono',monospace;color:#f37c45;letter-spacing:.15em;text-transform:uppercase;margin:0 0 10px}
.proof-visual__message strong{display:block;min-height:2.24em;font:400 clamp(24px,2.6vw,36px)/1.12 Anton,sans-serif;text-transform:uppercase;text-wrap:balance;letter-spacing:.02em}
.proof-visual__gate{grid-area:gate;align-self:start;border-left:1px solid #57524a;padding-left:16px}
.proof-visual__decision{opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .4s,transform .4s,visibility .4s}
.proof-visual__decision p{font:600 10px/1.4 'IBM Plex Mono',monospace;letter-spacing:.1em;text-transform:uppercase;color:#cfc8bc;margin:0 0 9px}
.proof-visual__decision div{display:grid;gap:6px}
.proof-visual__decision button{cursor:pointer;min-height:36px;border:1px solid #8d877d;background:transparent;color:#f3efe7;padding:8px 10px;text-align:left;font:600 10px/1.25 'IBM Plex Mono',monospace}
.proof-visual__decision button[aria-pressed='true']{background:#ec5e27;border-color:#ec5e27;color:#fff}
.proof-visual[data-step='3'] .proof-visual__decision{opacity:1;visibility:visible;transform:none}
.proof-visual__outcome{margin-top:10px;font:500 11px/1.4 Archivo,sans-serif;color:#e3ddd2;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}
.proof-visual[data-step='3'] .proof-visual__outcome{opacity:1;visibility:visible}
.proof-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));padding:0 24px 6px;background:#1b1a18}
.proof-nav a{display:flex;align-items:center;gap:6px;min-height:44px;padding:9px 4px;color:#bdb6aa;border-top:2px solid #3a3732;text-decoration:none;font:600 10px/1.3 'IBM Plex Mono',monospace;text-transform:uppercase;overflow-wrap:anywhere;transition:border-color .2s,color .2s}
.proof-nav a span{color:#f37c45}
.proof-nav a[aria-current='step']{border-color:#f37c45;color:#fff}
.proof-chapters{grid-area:chapters;list-style:none;margin:0;padding:0 0 0 clamp(18px,2vw,28px);border-left:1px solid var(--line)}
.proof-chapter{position:relative;min-height:clamp(390px,49vw,620px);border-top:1px solid var(--line);padding:clamp(28px,5vw,62px) 0 20px;display:flex;flex-direction:column;justify-content:center;scroll-margin-top:100px}
.proof-chapter:before{content:'';position:absolute;left:calc(-1 * clamp(18px,2vw,28px) - 5px);top:-5px;width:9px;height:9px;background:var(--accent)}
.proof-chapter:last-child{border-bottom:1px solid var(--line);min-height:max(clamp(390px,49vw,620px),var(--proof-stage-total,620px))}
.proof-chapter>span{font:600 11px/1.4 'IBM Plex Mono',monospace;color:var(--accent);letter-spacing:.15em;margin-bottom:25px}
.proof-chapter h3{font:400 clamp(31px,3.5vw,54px)/1.03 Anton,sans-serif;text-transform:uppercase;letter-spacing:.01em;text-wrap:balance;margin:0 0 18px}
.proof-chapter p{font:400 clamp(15px,1.35vw,18px)/1.55 Archivo,sans-serif;color:var(--muted);max-width:480px;text-wrap:pretty;margin:0}
.proof-shell__economy{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(20px,4vw,70px);border-top:2px solid var(--text);margin:80px 0 0;padding:28px 0}
.proof-shell__economy p{font:400 15px/1.55 Archivo,sans-serif;color:var(--muted);margin:0;max-width:500px;text-wrap:pretty}
.proof-shell__economy b{display:block;color:var(--text);font:400 clamp(26px,2.8vw,40px)/1.1 Anton,sans-serif;text-transform:uppercase;margin:0 0 12px}
@media(max-width:900px){
  .proof-shell__intro{grid-template-columns:1fr}.proof-shell h1{max-width:650px}.proof-shell__pitch{max-width:630px}
  holding-proof{display:block;--proof-stage-height:max(340px,min(56svh,450px))}
  .proof-stage{top:var(--proof-top,76px)}
  /* Mobile: compact scene above, chapter text below; the gate only takes space at the decision stage. */
  .proof-visual{height:var(--proof-stage-height);grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr) 84px auto auto;grid-template-areas:'top' 'window' 'axis' 'message' 'gate';gap:8px;padding:14px 16px 12px}
  .proof-visual__axis{margin:0 -16px}
  .proof-visual__evidence{grid-area:window;align-self:start;justify-self:end;z-index:1;margin:8px;padding:6px 8px;gap:2px;background:rgba(27,26,24,.86)}
  .proof-visual__evidence span{padding:4px 0 2px;font-size:8px}
  .proof-visual__message strong{min-height:0;font-size:clamp(20px,5.6vw,27px)}
  .proof-visual__chapter-tag{margin-bottom:5px}
  .proof-visual__gate{border-left:0;padding-left:0}
  .proof-visual:not([data-step='3']) .proof-visual__gate{display:none}
  .proof-visual[data-step='3'] .proof-visual__message strong{font-size:clamp(17px,4.6vw,22px)}
  .proof-visual__decision div{grid-template-columns:repeat(2,minmax(0,1fr))}
  .proof-visual__outcome{margin-top:6px;font-size:10px}
  .proof-nav{padding:0 16px 2px}.proof-nav a{min-height:40px;font-size:9px}
  .proof-chapters{margin-top:8px;padding-left:16px}
  .proof-chapter{min-height:52svh;padding:55px 0;max-width:650px;scroll-margin-top:calc(var(--proof-stage-height) + 130px)}
  .proof-chapter:before{left:-21px}
  .proof-chapter:last-child{min-height:52svh}
  .proof-shell__economy{margin-top:45px}
}
@media(max-width:600px){.proof-shell{padding:38px 18px 70px}.proof-shell h1{font-size:clamp(46px,13vw,70px)}.proof-shell__bridge{font-size:9px}.proof-visual__top{font-size:8px}.proof-visual__current,.proof-visual__xbf,.proof-visual__marksman{font-size:8px;max-width:96px}.proof-visual__current{left:6%}.proof-visual__marksman{right:16%}.proof-visual__decision p{font-size:9px;margin-bottom:6px}.proof-visual__decision div{grid-template-columns:1fr}.proof-visual__decision button{min-height:34px;font-size:10px;padding:7px 8px}.proof-visual__candidate b{font-size:8px}.proof-chapter{min-height:48svh;padding:30px 0;justify-content:flex-start;scroll-margin-top:calc(var(--proof-stage-height) + 112px)}.proof-chapter:last-child{min-height:48svh}.proof-shell__economy{grid-template-columns:1fr}}
@media(max-height:730px){.proof-stage{position:relative;top:auto}.proof-visual{height:max(470px,min(clamp(500px,46vw,620px),calc(100svh - 40px)))}.proof-chapter,.proof-chapter:last-child{min-height:320px}}
@media(max-height:730px) and (max-width:900px){.proof-visual{height:var(--proof-stage-height)}.proof-visual:not([data-step='3']) .proof-visual__gate{display:block}}
@media(prefers-reduced-motion:reduce){.proof-shell__cta,.proof-visual__photo,.proof-visual__candidate,.proof-visual__xbf,.proof-visual__marksman,.proof-visual__evidence,.proof-visual__evidence span,.proof-visual__decision,.proof-visual__outcome,.proof-nav a{transition:none!important}.proof-shell__cta:hover{transform:none}}