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:root{--paper:#f2f5f8;--ink:#101827;--cobalt:#1646ff;--signal:#ff5a36;--arrival:#6b3dff;--muted:#5f6b7e;--line:#cbd3dd;--white:#fbfdff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);font-family:var(--font-body), sans-serif;margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}::selection{color:#fff;background:var(--cobalt)}.home-shell{grid-template-rows:auto 1fr auto;min-height:100svh;padding:24px clamp(18px,4vw,72px);display:grid}.site-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;min-height:52px;font-size:.86rem;display:flex}.brand{font-family:var(--font-display), sans-serif;align-items:center;gap:12px;font-weight:600;display:flex}.brand span{color:var(--cobalt);font-family:var(--font-mono), monospace;font-size:.7rem}.home-hero{align-content:center;padding:8vh 0 5vh;display:grid}.kicker{color:var(--muted);font-family:var(--font-mono), 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minmax(0,1.5fr);align-items:start;column-gap:clamp(32px,7vw,110px);min-height:calc(100svh - 76px);padding:clamp(42px,7vw,100px) clamp(18px,4vw,72px) 54px;display:grid;position:relative}.stage-intro{position:sticky;top:32px}.stage-intro h1{font-family:var(--font-display), sans-serif;letter-spacing:-.055em;margin:0;font-size:clamp(2.7rem,5vw,5.5rem);font-weight:600;line-height:.93}.stage-intro>p:last-child{max-width:33ch;color:var(--muted);margin:24px 0 0;font-size:1.04rem;line-height:1.55}.number-form{grid-column:2;width:100%;max-width:820px}.number-form>label{color:var(--muted);margin-bottom:8px;font-size:.8rem;display:block}.input-row{border-block:1px solid var(--ink);grid-template-columns:minmax(0,1fr) auto;display:grid}.input-row input{min-width:0;height:clamp(100px,13vw,176px);color:var(--ink);font-family:var(--font-mono), monospace;letter-spacing:.14em;font-variant-numeric:tabular-nums;background:0 0;border:0;outline:0;padding:0 22px;font-size:clamp(4rem,9vw,9rem);line-height:1}.input-row:focus-within{box-shadow:inset 0 0 0 3px var(--signal)}.launch-button{color:#fff;background:var(--cobalt);cursor:pointer;text-align:left;border:0;justify-content:space-between;align-self:stretch;align-items:center;width:clamp(150px,16vw,220px);padding:18px;font-weight:600;display:flex}.launch-button:hover{background:#0e34ca}.form-meta{min-height:52px;color:var(--muted);justify-content:space-between;align-items:center;gap:18px;font-size:.8rem;display:flex}.form-error,.form-success{min-height:24px;margin:-4px 0 0;font-size:.85rem}.form-error{color:#b52e18}.form-success{color:#255927}.machine{grid-column:1/-1;grid-template-columns:minmax(190px,.55fr) minmax(0,1.6fr);align-items:start;column-gap:clamp(32px,7vw,110px);margin-top:clamp(72px,10vw,140px);display:grid}.machine-label{color:var(--muted);font-family:var(--font-mono), monospace;margin:12px 0;font-size:.72rem}.digit-rack{border-block:1px solid var(--ink);grid-column:2;grid-template-columns:repeat(4,1fr);display:grid}.digit-rack span{text-align:center;min-width:0;font-family:var(--font-mono), monospace;letter-spacing:-.08em;border-right:1px solid var(--line);animation:.48s cubic-bezier(.2,.8,.2,1) both number-arrive;animation-delay:var(--delay);padding:1vw 0;font-size:clamp(5rem,15vw,14rem);line-height:.95}.digit-rack span:last-child{border-right:0}.is-arrived .digit-rack span{color:var(--arrival)}@keyframes number-arrive{0%{opacity:0;transform:translateY(-.18em)}to{opacity:1;transform:none}}.equation-window{grid-column:2;min-height:236px;padding-top:28px}.equation-stack{width:min(100%,520px);font-family:var(--font-mono), monospace;margin-left:auto}.equation-stack>div{border-bottom:1px solid var(--line);grid-template-columns:1fr auto;align-items:end;gap:32px;min-height:54px;display:grid}.equation-stack span{color:var(--muted);font-family:var(--font-body), sans-serif;font-size:.76rem}.equation-stack strong{letter-spacing:.08em;font-size:clamp(1.5rem,3vw,2.7rem);font-weight:500}.equation-stack .descending{color:var(--cobalt)}.equation-stack .ascending{color:var(--signal)}.equation-stack .equation-result{border-bottom-color:var(--ink)}.equation-result strong{color:var(--ink)}.machine-prompt{color:var(--muted);margin:0}.arrival-copy{padding-top:8px}.arrival-copy p{font-family:var(--font-display), sans-serif;letter-spacing:-.04em;margin:0 0 16px;font-size:clamp(1.8rem,4vw,3.7rem)}.arrival-copy span{color:var(--arrival);font-family:var(--font-mono), monospace}.playback{border-top:1px solid var(--line);grid-column:2;align-items:center;min-height:64px;display:flex}.playback button{min-width:52px;min-height:48px;color:var(--ink);cursor:pointer;background:0 0;border:0}.playback button:disabled{opacity:.3;cursor:default}.playback .play-button{color:#fff;background:var(--ink);border-radius:4px;min-width:110px}.playback>span{color:var(--muted);font-family:var(--font-mono), monospace;margin-left:auto;font-size:.75rem}.trajectory-trail{border-top:1px solid var(--line);grid-column:1/-1;gap:12px;margin:72px 0 0;padding:18px 0;list-style:none;display:flex;overflow-x:auto}.trajectory-trail li{opacity:.25;font-family:var(--font-mono), monospace;white-space:nowrap;align-items:center;gap:12px;transition:opacity .3s;display:flex}.trajectory-trail li.is-visible{opacity:1}.trajectory-trail li:last-child{color:var(--arrival)}.trajectory-trail i{color:var(--muted);font-style:normal}.guided-machine{background:var(--white);border:1px solid var(--ink);width:min(100%,980px);box-shadow:10px 10px 0 var(--ink);grid-column:1/-1;margin:clamp(64px,9vw,120px) auto 0;scroll-margin-top:16px}.number-stage.has-started{min-height:auto;padding-top:32px;display:block}.number-stage.has-started .stage-intro,.number-stage.has-started .number-form{display:none}.number-stage.has-started .guided-machine{margin-top:0}.machine-topline{min-height:46px;color:var(--muted);border-bottom:1px solid 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ul{margin:0;padding:0;list-style:none}.sources li{border-bottom:1px solid var(--line);padding:10px 0}.editorial-cta{border-top:1px solid var(--ink);justify-content:space-between;align-items:center;margin:0 clamp(18px,4vw,72px);padding:32px 0;display:flex}.error-page{flex-direction:column;justify-content:center;align-items:flex-start;min-height:100svh;padding:clamp(30px,7vw,100px);display:flex}.error-page h1{max-width:900px;font-family:var(--font-display), sans-serif;letter-spacing:-.06em;margin:0 0 20px;font-size:clamp(3rem,8vw,8rem);line-height:.92}.error-page p:not(.kicker){color:var(--muted);margin-bottom:34px}.error-page button{cursor:pointer;border:0}@media (max-width:800px){.experience-header{min-height:62px;margin:0 16px}.header-actions .text-button{display:none}.number-stage{min-height:auto;padding:42px 16px 50px;display:block}.stage-intro{position:static}.stage-intro h1{font-size:clamp(2.6rem,13vw,4.4rem)}.number-form{margin-top:48px}.input-row{display:block}.input-row input{letter-spacing:.06em;text-align:center;width:100%;height:112px;padding:0 10px;font-size:clamp(3.6rem,21vw,6rem)}.launch-button{width:100%;min-height:54px}.machine{margin-top:86px;display:block}.machine-label{margin-bottom:12px}.digit-rack span{padding:8px 0;font-size:clamp(4.3rem,22vw,7rem)}.equation-window{min-height:250px}.equation-stack>div{min-height:60px}.equation-stack span{max-width:145px}.playback{z-index:3;border:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#f2f5f8f0;border-radius:5px;padding:8px;position:sticky;bottom:12px}.trajectory-trail{margin-top:26px}.guided-machine{box-shadow:6px 6px 0 var(--ink);margin-top:44px;scroll-margin-top:8px}.number-stage.has-started{padding-top:8px}.machine-topline{min-height:42px;padding:0 12px}.rule-rail li{flex-direction:column;gap:3px;min-height:54px;padding:0 5px;font-size:.68rem}.rule-rail li span{width:19px;height:19px;font-size:.58rem}.guide-stage{min-height:410px;padding:24px 18px}.guide-copy h2,.arrival-copy h2{font-size:clamp(2rem,10vw,3rem)}.guide-copy.compact{margin-bottom:22px}.guide-copy.compact h2{font-size:clamp(1.55rem,7vw,2.2rem)}.guide-copy>p:last-child,.arrival-copy>p:last-child{margin-top:18px;font-size:.92rem}.sort-row{margin-top:16px;display:block}.sort-row-label{flex-direction:row;justify-content:space-between;align-items:center;margin-bottom:6px}.moving-digits{height:72px}.moving-digits span{font-size:clamp(2.8rem,16vw,4rem)}.subtraction-workbench{display:block}.subtraction-workbench .guide-copy{text-align:left}.vertical-sum{width:max-content;min-width:0;margin:18px auto 0;font-size:clamp(3.1rem,16vw,4.6rem)}.result-number{letter-spacing:.02em;margin:32px auto 20px;font-size:clamp(4.5rem,22vw,6.5rem)}.guide-controls{z-index:3;grid-template-columns:88px 1fr;min-height:66px;position:sticky;bottom:0}.guide-controls button{min-height:62px}.back-button span{display:none}.next-button{padding:0 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