:root{color-scheme:dark;font-family:Courier,"Courier New",monospace;background:#091426;color:#d4e0e9;font-synthesis:none}*{box-sizing:border-box}body{margin:0;font-size:13px;font-weight:400;line-height:1.5}main{max-width:1190px;margin:30px auto;padding:0 18px}header{border:3px double #568cb3;text-align:center;padding:9px 8px 6px}.wordmark{color:#9ad1ed;letter-spacing:.32em;border-bottom:1px solid #568cb3;margin:-2px -5px 7px;padding-bottom:9px}.voice{color:#f0f4f7}.attribution{color:#a8bbcB}.layout{display:grid;grid-template-columns:minmax(0,3fr) minmax(200px,1fr);gap:30px}.prompt,.reply,label{color:#9ad1ed}.programs{display:grid;gap:0;margin:20px 0}.programs button{white-space:pre-wrap;text-align:left;font:inherit;color:inherit;border:0;background:transparent;padding:2px 15px;cursor:pointer}.programs button:hover,.programs button:focus{color:#f0f4f7;background:#142438;outline:1px solid #568cb3}.programs .reset{margin-top:20px}.scenario{font-size:11px;display:block}select{background:#091426;color:#d4e0e9;font:inherit;border:1px solid #568cb3;padding:6px;margin-left:6px}.result{white-space:pre-wrap;overflow-wrap:anywhere;border:1px solid #568cb3;padding:15px;min-height:80px;line-height:1.75;font:inherit;font-size:12px}.reply{min-height:3em;max-width:80ch}.question{color:#a8bbcb;overflow-wrap:anywhere}.command{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.command label{font-size:12px}.command input{flex:1;min-width:70px;width:150px;color:#f0f4f7;background:transparent;border:0;border-bottom:1px solid #568cb3;font:inherit;padding:6px;outline-color:#9ad1ed}.enter{border:1px solid #568cb3;background:transparent;color:#9ad1ed;font:inherit;padding:5px 8px;cursor:pointer}aside{border-left:1px solid #354455;padding:20px 0 0 22px;color:#a8bbcb;font-size:11px}h1{font-size:12px;letter-spacing:.2em;color:#9ad1ed;font-weight:inherit}.rocket{font:inherit;white-space:pre;line-height:1.35;color:#d4e0e9}.state{color:#f0f4f7;border-top:1px solid #568cb3;border-bottom:1px solid #568cb3;padding:10px 0;overflow-wrap:anywhere}a{color:#9ad1ed;text-underline-offset:3px}footer{margin-top:35px;padding:15px 0;border-top:1px solid #354455;color:#a8bbcb;font-size:10px;line-height:1.9}button:focus-visible,a:focus-visible{outline:2px solid #9ad1ed;outline-offset:3px}@media(max-width:760px){main{margin:15px auto;padding:0 10px}.layout{grid-template-columns:1fr;gap:5px}aside{border-left:0;border-top:1px solid #354455;padding:10px 0}.rocket{float:right;margin:0 15px 10px 10px}.programs button{padding:5px 3px;font-size:12px}.voice{font-size:12px}.wordmark{letter-spacing:.17em}footer{clear:both}.result{font-size:11px}.command label{width:100%}}
summary{cursor:pointer;color:#9ad1ed}
.output{border:1px solid #568cb3}.output h2{font:inherit;font-size:11px;color:#9ad1ed;text-align:center;border-bottom:1px solid #568cb3;padding:10px;margin:0;overflow-wrap:anywhere}.output .result{border:0;margin:0;min-height:130px}.actions{display:flex;flex-wrap:wrap;gap:8px;padding:0 15px 12px}.actions:has(button):empty{display:none}.raw{padding:0 15px 15px}.raw pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;font-size:10px}.progress{white-space:pre-wrap;font:inherit;font-size:10px;line-height:1.9}.flight{animation:climb 5s ease-in-out both}@keyframes climb{0%{transform:translateY(20px);opacity:.5}100%{transform:translateY(-15px);opacity:1}}@media(prefers-reduced-motion:reduce){.flight{animation:none}}
.station{color:#568cb3;font-size:11px;margin:0 0 5px;white-space:pre-wrap}.tray{font:inherit;white-space:pre;font-size:10px;color:#9ad1ed}.desk{font:inherit;font-size:11px;color:#568cb3;margin:30px 0 0;overflow:hidden;white-space:pre}footer{margin-top:12px}
.output h2{font-size:13px;letter-spacing:.04em;word-spacing:.3em;line-height:1.6}.package{padding:0 15px 16px;border-top:1px solid #568cb3}.package h3{font:inherit;color:#9ad1ed;word-spacing:.2em}.package-search{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.package-search label{font-size:11px}.package-search input{flex:1;min-width:120px;background:transparent;color:#f0f4f7;border:1px solid #568cb3;padding:6px;font:inherit}.package-file{padding:9px 0;border-top:1px solid #354455}.package-file summary{overflow-wrap:anywhere}.package p,.file-identity{font-size:11px}.file-identity{white-space:pre-wrap;overflow-wrap:anywhere;color:#a8bbcb;font-family:inherit}.file-content{font:inherit;font-size:12px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere;max-height:55vh;overflow:auto;padding:10px;border:1px solid #354455}.missing{color:#f0f4f7}
.layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:24px}.command{padding-top:18px}.command label{width:100%;font-size:13px}.command input{width:auto}.reply{min-height:2em;margin:12px 0}.question:empty{display:none}.mission-brief{font-size:12px;color:#a8bbcb;line-height:1.7}.programs{margin:18px 0}.mission-board{display:grid;grid-template-columns:minmax(140px,.9fr) minmax(160px,1.1fr);gap:14px;align-items:center}.launch-display{text-align:center;overflow:hidden}.rocket{width:18ch;margin:10px auto 0;font-size:16px;line-height:1.2;text-align:left}.pad{font-size:12px;color:#9ad1ed;margin:0 0 10px}.handoffs{list-style:none;padding:0;margin:0}.handoffs li{padding:9px 0;border-bottom:1px solid #354455;line-height:1.6}.handoffs span{display:block;font-size:11px}.handoffs small{display:block;font-size:10px;letter-spacing:.08em}.received{color:#f0f4f7}.waiting{color:#a8bbcb}.ledger>.prompt{font-size:11px;word-spacing:.15em}.state{text-align:center}.package{border:3px double #568cb3;padding:0 12px 12px;margin:16px 0;max-height:65vh;overflow:auto}.package h3{font-size:12px}.package-search label{width:100%}.file-content{max-height:32vh}.empty-tray{border:3px double #568cb3;padding:25px;text-align:center;line-height:2;color:#9ad1ed}.fixture-clock{font-size:10px;line-height:1.7}@media(max-width:760px){.layout{grid-template-columns:1fr}.rocket{float:none;font-size:16px;margin:10px auto 0}.mission-board{margin-top:10px}.package{max-height:65vh}aside{padding:10px 0}}@media(max-width:380px){.mission-board{grid-template-columns:1fr}.rocket{font-size:15px}}
.conversation{position:sticky;top:0;z-index:1;background:#091426;border-bottom:1px solid #354455;padding-bottom:5px}.conversation .command{padding-top:12px}.conversation .reply{margin:9px 0}.programs button{scroll-margin-top:150px}

.impact h2{font:inherit;font-size:11px;color:#9ad1ed;letter-spacing:.08em}.impact ol{list-style:none;padding:0;margin:0}.impact li{position:relative;border:1px solid #354455;padding:8px 10px;margin:0 0 15px;background:#0d1c2d}.impact li+li:before{content:"↓";position:absolute;top:-18px;left:18px;color:#9ad1ed}.impact small{display:block;color:#9ad1ed;font-size:10px;letter-spacing:.06em}.impact span{display:block;color:#d4e0e9;font-size:11px;overflow-wrap:anywhere}.impact .held li:nth-child(n+2){border-style:dashed}.impact .held li:last-child{border:3px double #9ad1ed}.impact-caption{font-size:10px;line-height:1.6}.difference{font-size:11px;margin:12px 0;overflow-wrap:anywhere}.difference code{font-family:inherit;font-size:13px}.difference mark{background:#9ad1ed;color:#091426;padding:2px 3px}.handoff-ledger{padding:8px 0}.fault-flight{animation:error-climb 4s ease-in-out both}@keyframes error-climb{0%{transform:translateY(35px)}60%{transform:translateY(-35px)}100%{transform:translateY(-35px);opacity:.5}}.launch-display:has(.fault-flight) .pad{border:1px dashed #9ad1ed;padding:8px}.output .result{max-height:65vh;overflow:auto}@media(prefers-reduced-motion:reduce){.fault-flight{animation:none;opacity:.5}}

.actions{padding:0 0 12px}.actions:not(:has(button)){display:none}.actions button{font-size:12px;text-align:left}.actions button:hover{background:#142438;color:#f0f4f7}

.lesson-layout{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:32px;margin-top:22px}.lesson-title{font-size:21px;line-height:1.5;letter-spacing:.04em;color:#f0f4f7;max-width:30ch}.lesson-copy,.lesson-takeaway{font-size:13px;line-height:1.8}.notation{display:grid;grid-template-columns:1fr 1fr;text-align:center;border:3px double #568cb3;margin:24px 0}.notation>div{padding:18px 8px}.notation>div+div{border-left:1px solid #354455}.notation small{display:block;font-size:10px;color:#9ad1ed}.notation span{display:block;font-size:72px;line-height:1.5;margin-top:10px}.bar{text-decoration:overline;text-decoration-thickness:2px}.lesson-actions{display:flex;flex-wrap:wrap;gap:10px}.lesson-actions .enter{padding:10px;text-align:left}.secondary{font-size:11px}.lesson-takeaway{border-left:2px solid #568cb3;padding-left:14px;margin:24px 0;color:#a8bbcb}.lesson-flow{border-left:1px solid #354455;padding:5px 0 0 24px}.lesson-flow h2,.comparison h2{font:inherit;color:#9ad1ed;letter-spacing:.08em}.lesson-flow ol{list-style:none;padding:0}.lesson-flow li{position:relative;border:1px solid #568cb3;padding:14px;margin:0 0 23px}.lesson-flow li+li:before{content:"↓";position:absolute;top:-25px;left:14px;color:#9ad1ed}.lesson-flow small{display:block;color:#9ad1ed;font-size:10px}.lesson-flow strong{display:block;font-size:14px;font-weight:400;margin-top:6px;overflow-wrap:anywhere}.lesson-flow p{font-size:11px;color:#a8bbcb;margin-bottom:0}.comparison{padding:12px;border:1px solid #568cb3;margin-top:20px;font-size:11px}.comparison>div{display:grid;grid-template-columns:1fr 1fr;gap:14px}.comparison p{line-height:1.8}.lesson-info{margin-top:24px;font-size:11px;line-height:1.8}.lesson-layout .conversation{position:static}.lesson-layout .reply{font-size:11px}@media(max-width:760px){.lesson-layout{grid-template-columns:1fr;gap:20px}.lesson-flow{border-left:0;border-top:1px solid #354455;padding:15px 0 0}.lesson-title{font-size:19px}}

.boundary-map{display:flex;align-items:center;justify-content:center;gap:9px;border:1px solid #354455;padding:10px;margin:12px 0 0;color:#d4e0e9;font-size:10px;letter-spacing:.05em;text-align:center;list-style:none}.boundary-map li+li:before{content:"→";color:#9ad1ed;margin-right:9px}.degs-name{margin:7px 0 0;color:#a8bbcb;font-size:10px;text-align:center;letter-spacing:.08em}.stop-conditions{margin-top:20px}.stop-conditions h2,.advanced>p{font:inherit;color:#9ad1ed;letter-spacing:.08em}.stop-conditions>div{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.stop-conditions article{border:1px solid #354455;padding:10px;min-width:0}.stop-conditions article.current{border-color:#568cb3}.stop-conditions small,.stop-conditions strong{display:block;overflow-wrap:anywhere}.stop-conditions small{min-height:2.7em;color:#9ad1ed;font-size:9px;letter-spacing:.05em}.stop-conditions strong{margin-top:6px;color:#f0f4f7;font-size:11px;font-weight:400}.stop-conditions p{margin-bottom:0;color:#a8bbcb;font-size:10px;line-height:1.6}.advanced{border:1px solid #354455;padding:12px;margin:20px 0}.advanced>p{margin:0 0 10px}.advanced span{color:#a8bbcb;letter-spacing:0;font-size:10px}.guide-prompts{color:#a8bbcb;font-size:10px;line-height:1.7}@media(max-width:760px){.boundary-map{align-items:stretch;flex-direction:column;gap:3px}.boundary-map li+li:before{display:block;transform:rotate(90deg);margin:0}.stop-conditions>div{grid-template-columns:1fr}.stop-conditions small{min-height:0}.lesson-flow ol{display:grid;grid-template-columns:1fr;gap:0}}

/* Persistent mission position after keyboard focus leaves a program. */
.programs .program{display:grid;grid-template-columns:3ch minmax(0,1fr) 5ch;gap:8px;align-items:baseline;border-left:2px solid transparent;padding:4px 10px}
.programs .program-label{min-width:0}.programs .program-status{text-align:right;font-size:10px;letter-spacing:.08em}
.programs .program.is-waiting{color:#8295a6}.programs .program.is-complete{color:#c7d7e3;border-left-color:#568cb3}
.programs .program.is-current{color:#f0f4f7;background:#142438;border-left-color:#9ad1ed}
.programs .program.is-held{color:#f0f4f7;background:#101e30;border-left:3px double #9ad1ed}
.programs .program.is-current .program-status,.programs .program.is-held .program-status{color:#9ad1ed}

.mission-progress{margin:10px 0 18px}.mission-progress p{margin:7px 0 0;color:#9ad1ed;font-size:9px;letter-spacing:.06em;text-align:right}
.mission-rail{display:grid;grid-template-columns:repeat(7,1fr);gap:4px}
.mission-segment{height:4px;border:1px solid #354455;background:#0d1c2d}
.mission-segment.is-complete{border-color:#9ad1ed;background:#568cb3;box-shadow:0 0 7px rgba(154,209,237,.28)}

.impact li{transition:border-color .16s linear,background-color .16s linear,color .16s linear}
.impact li small{display:flex;justify-content:space-between;gap:8px}.impact li small b{font-weight:400;font-size:9px;color:#8295a6}
.impact li.is-complete{border-color:#568cb3;background:#102238}.impact li.is-complete small b{color:#9ad1ed}
.impact li.is-current{border:3px double #9ad1ed;background:#142438;padding:6px 8px}.impact li.is-current small b{color:#f0f4f7}
.impact li.is-held{border-style:dashed;border-color:#9ad1ed;background:#0b1728}.impact li.is-held small b{color:#f0f4f7}
.impact li.is-waiting{opacity:.72}.impact li.is-current:before{color:#f0f4f7}

@media(prefers-reduced-motion:no-preference){
  .mission-segment.is-complete{animation:stage-lock .55s ease-out both}
  .mission-segment.is-complete:nth-child(2){animation-delay:.04s}.mission-segment.is-complete:nth-child(3){animation-delay:.08s}
  .mission-segment.is-complete:nth-child(4){animation-delay:.12s}.mission-segment.is-complete:nth-child(5){animation-delay:.16s}
  .mission-segment.is-complete:nth-child(6){animation-delay:.2s}.mission-segment.is-complete:nth-child(7){animation-delay:.24s}
  .impact li.is-current{animation:signal-arrival .7s ease-out both}
}
@keyframes stage-lock{0%{opacity:.35;background:#0d1c2d}100%{opacity:1;background:#568cb3}}
@keyframes signal-arrival{0%{opacity:.6;box-shadow:0 0 0 rgba(154,209,237,0)}100%{opacity:1;box-shadow:0 0 10px rgba(154,209,237,.16)}}
@media(prefers-reduced-motion:reduce){.mission-segment.is-complete,.impact li.is-current{animation:none}}
@media(forced-colors:active){.programs .program.is-current,.programs .program.is-held,.impact li.is-current,.impact li.is-held{border-color:Highlight}.mission-segment.is-complete{background:Highlight}}
@media(max-width:760px){.programs .program{padding:6px 4px}.mission-progress{margin-bottom:12px}}

/* Lighter rules and labels, derived from the existing navy / blue palette. */
:root{--stage-paper:#091426;--stage-signal:#9ad1ed;--stage-rule:#7ca5c3;--stage-divider:#597385;--stage-label:#8ab4d1}
.station,.desk{color:var(--stage-label)}
header,.wordmark,.output,.output h2,.result,.state,.package,.enter,select,.package-search input,.command input{border-color:var(--stage-rule)}
aside,footer,.conversation,.handoffs li,.package-file,.file-content,.impact li,.stop-conditions article,.advanced,.boundary-map,.mission-segment{border-color:var(--stage-divider)}
.programs .program.is-waiting,.impact li small b{color:#a8bbcb}
.impact li.is-waiting{opacity:.88}
.impact li.is-complete,.stop-conditions article.current{border-color:var(--stage-rule)}
.impact li.is-current,.impact li.is-held{border-color:var(--stage-signal)}
.mission-progress p{font-size:10px;letter-spacing:.04em}
input::placeholder{color:#a8bbcb;opacity:1}

/* The signal depicts existing receipts; it cannot advance a mission. */
.handoff-signal{margin:12px 0 0;padding:0 0 12px;border:1px solid var(--stage-divider);text-align:center}
.signal-diagram{display:block;width:100%;max-width:260px;height:auto;margin:0 auto;color:var(--stage-signal);fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.signal-route{stroke:var(--stage-rule);stroke-dasharray:3 5}
.signal-receiver,.signal-pivot{stroke:var(--stage-rule)}
.signal-paper{fill:var(--stage-paper)}
.signal-barrier{stroke-width:3;transform-origin:146px 61px}
.signal-labels{position:relative;max-width:260px;margin:0 auto;height:25px;color:#a8bbcb;font-size:10px}
.signal-labels span{position:absolute;transform:translateX(-50%)}
.signal-labels span:nth-child(1){left:11.7%}.signal-labels span:nth-child(2){left:60.8%}.signal-labels span:nth-child(3){left:88.8%}
.handoff-signal figcaption{padding:0 9px;line-height:1.65}
.handoff-signal strong{display:block;color:var(--stage-signal);font-size:10px;font-weight:400;letter-spacing:.04em}
.handoff-signal figcaption span{display:block;margin-top:5px;color:#c7d7e3;font-size:10px}
.signal-checking .signal-packet{transform:translateX(48px)}
:is(.signal-held,.signal-staged,.signal-bypassed) .signal-packet{transform:translateX(88px)}
:is(.signal-accepted,.signal-ready,.signal-flown) .signal-packet{transform:translateX(176px)}
:is(.signal-accepted,.signal-ready,.signal-flown) .signal-barrier{transform:rotate(-82deg)}
.signal-held,.signal-bypassed{border:1px dashed var(--stage-signal)}
.signal-held strong,.signal-bypassed strong{color:#f0f4f7}
.signal-ready,.signal-flown{border:3px double var(--stage-signal)}
.launch-plume{display:none;fill:none;stroke:var(--stage-signal);stroke-width:1.5;stroke-linejoin:round;width:70px;height:30px;margin:-3px auto 0}
.launch-display:has(.flight) .launch-plume,.launch-display:has(.fault-flight) .launch-plume{display:block}
@media(prefers-reduced-motion:no-preference){
  .signal-checking .signal-packet{animation:packet-check .65s ease-out both}
  :is(.signal-held,.signal-staged) .signal-packet{animation:packet-hold .7s ease-out both}
  :is(.signal-accepted,.signal-ready,.signal-flown) .signal-packet{animation:packet-release .9s ease-out both}
  .signal-held{animation:boundary-hold .7s ease-out both}
  .launch-display:has(.flight) .launch-plume{animation:climb 5s ease-in-out both}
  .launch-display:has(.fault-flight) .launch-plume{animation:error-climb 4s ease-in-out both}
}
@keyframes packet-check{from{transform:translateX(0)}to{transform:translateX(48px)}}
@keyframes packet-hold{from{transform:translateX(48px)}to{transform:translateX(88px)}}
@keyframes packet-release{from{transform:translateX(88px)}to{transform:translateX(176px)}}
@keyframes boundary-hold{from{box-shadow:0 0 0 rgba(154,209,237,0)}to{box-shadow:0 0 12px rgba(154,209,237,.18)}}
@media(prefers-reduced-motion:reduce){.signal-packet,.handoff-signal,.launch-plume{animation:none!important}}
@media(forced-colors:active){.signal-diagram{color:CanvasText}.signal-paper{fill:Canvas}.signal-route,.signal-receiver,.signal-pivot{stroke:CanvasText}.handoff-signal{border-color:CanvasText}}

/* The traced logo keeps the original proportions on a transparent field. */
.rocket{position:relative}
.rocket-logo{position:absolute;left:8ch;top:6em;width:4ch;height:4ch;object-fit:contain;border-radius:50%}
.footer-logo{display:block;width:80px;height:80px;object-fit:contain;border-radius:50%;margin:0 0 12px}

/* Public mission arcade: one short loop before the full evidence station. */
.plain-mechanism{margin:18px 0 24px;padding:18px;border:3px double var(--stage-rule);background:#0d1c2d}
.eyebrow{margin:0 0 7px;color:var(--stage-signal);font-size:10px;letter-spacing:.12em}
.plain-mechanism h2,.applications h2,.history-alert h2,.successor-archive h2{font:inherit;color:#f0f4f7;font-size:16px;line-height:1.55;margin:0}
.plain-mechanism ol{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;list-style:none;padding:0;margin:16px 0 0}
.plain-mechanism li{border:1px solid var(--stage-divider);padding:10px;min-width:0}
.plain-mechanism b,.plain-mechanism span{display:block}
.plain-mechanism b{color:var(--stage-signal);font-weight:400;font-size:10px;letter-spacing:.08em}
.plain-mechanism span{margin-top:7px;color:#d4e0e9;font-size:11px;line-height:1.6}

.arcade-stage{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(210px,.65fr);gap:30px;align-items:center;padding:24px;border:1px solid var(--stage-divider);background:linear-gradient(145deg,#091426 0%,#0d1c2d 100%)}
.arcade-copy{min-width:0}.arcade-progress{margin-bottom:18px}.arcade-progress>div{display:grid;grid-template-columns:repeat(4,1fr);gap:5px}
.arcade-segment{height:6px;border:1px solid var(--stage-divider);background:#091426}
.arcade-segment.is-complete{border-color:var(--stage-signal);background:var(--stage-rule);box-shadow:0 0 8px rgba(154,209,237,.25)}
.arcade-progress p{margin:7px 0 0;color:var(--stage-signal);font-size:10px;letter-spacing:.06em;text-align:right}
.arcade-stage .lesson-title{max-width:34ch;margin:0;color:#f0f4f7;font-size:24px;line-height:1.35;letter-spacing:.02em}
.arcade-stage .lesson-copy{max-width:65ch;margin:14px 0 0;color:#c7d7e3;font-size:14px;line-height:1.75}
.arcade-stage .notation{max-width:440px;margin:20px 0}.arcade-stage .notation>div{padding:11px 8px}.arcade-stage .notation span{font-size:48px;line-height:1.35;margin-top:4px}
.lesson-actions{display:flex;flex-wrap:wrap;gap:9px}.lesson-actions form{margin:0}.lesson-actions .enter{min-height:44px;padding:10px 13px;background:#102238;color:#f0f4f7;border-color:var(--stage-signal)}
.lesson-actions .secondary{background:transparent;color:var(--stage-signal);border-color:var(--stage-rule)}
.arcade-vehicle{text-align:center;min-width:0;overflow:hidden}.lesson-rocket{position:relative;width:16ch;margin:5px auto 0;text-align:left;font:inherit;font-size:19px;line-height:1.18;color:#f0f4f7;white-space:pre}
.lesson-rocket-logo{position:absolute;left:7.35ch;top:4.75em;width:3.4ch;height:3.4ch;object-fit:contain;border-radius:50%}
.arcade-pad{margin:0;color:var(--stage-signal);font-size:11px;line-height:1.7;overflow-wrap:anywhere}
.phase-held,.phase-bypassed{border-style:dashed;border-color:var(--stage-signal)}
.phase-corrected,.phase-accepted,.phase-launched{border:3px double var(--stage-signal);padding:22px}

.history-alert,.successor-archive{margin:18px 0;padding:20px;border:3px double var(--stage-signal);background:#101e30}
.history-alert p,.successor-archive p{max-width:86ch;color:#c7d7e3;line-height:1.75}
.history-alert em{color:#f0f4f7}.successor-archive{background:#102238}

.applications{margin:24px 0;padding:20px 0;border-top:1px solid var(--stage-rule);border-bottom:1px solid var(--stage-rule)}
.applications h2{font-size:16px}.applications>div{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}.applications article{border:1px solid var(--stage-divider);padding:14px;background:#0d1c2d}.applications small{color:var(--stage-signal);font-size:9px;letter-spacing:.08em}.applications h3{margin:7px 0;color:#f0f4f7;font:inherit;font-size:13px}.applications article p,.application-limit{color:#a8bbcb;font-size:11px;line-height:1.7}.application-limit{margin:13px 0 0}
.guide{position:static;margin-top:22px;border:1px solid var(--stage-divider);padding:0 14px 10px}.lesson-info{margin-top:20px;padding:12px 0;font-size:11px;line-height:1.8}

@media(prefers-reduced-motion:no-preference){
  .phase-launched .lesson-rocket{animation:lesson-liftoff 3s ease-in-out both}
  .arcade-segment.is-complete{animation:stage-lock .5s ease-out both}
}
@keyframes lesson-liftoff{0%{transform:translateY(18px)}100%{transform:translateY(-18px)}}
@media(prefers-reduced-motion:reduce){.phase-launched .lesson-rocket,.arcade-segment.is-complete{animation:none}}
@media(forced-colors:active){.plain-mechanism,.arcade-stage,.history-alert,.successor-archive,.applications article{border-color:CanvasText}.arcade-segment.is-complete{background:Highlight}}
@media(max-width:760px){
  .plain-mechanism ol{grid-template-columns:1fr 1fr}.arcade-stage{grid-template-columns:1fr;padding:18px}.arcade-vehicle{order:-1}.lesson-rocket{font-size:16px}
  .arcade-stage .lesson-title{font-size:20px}
  .applications>div{grid-template-columns:1fr}.lesson-actions{display:grid}.lesson-actions .enter{width:100%}.phase-corrected,.phase-accepted,.phase-launched{padding:16px}
}
@media(max-width:420px){.plain-mechanism ol{grid-template-columns:1fr}.plain-mechanism,.arcade-stage{padding:14px}.history-alert,.successor-archive{padding:15px}.arcade-stage .notation span{font-size:42px}}

/* Play first: three live facts, then reveal the component names after the first move. */
.mission-status{display:grid;grid-template-columns:repeat(3,1fr);margin:18px 0 0;border:1px solid var(--stage-divider)}
.mission-status div{min-width:0;padding:10px}.mission-status div+div{border-left:1px solid var(--stage-divider)}
.mission-status dt{color:var(--stage-signal);font-size:9px;letter-spacing:.1em}.mission-status dd{margin:5px 0 0;color:#f0f4f7;font-size:10px;line-height:1.5;overflow-wrap:anywhere}
.lesson-reveal{margin:18px 0;padding:20px;border:1px solid var(--stage-rule);background:#0d1c2d}
.lesson-reveal h2,.mission-unlocked h2{margin:0;color:#f0f4f7;font:inherit;font-size:16px;line-height:1.55}
.lesson-reveal>div{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-top:15px}
.lesson-reveal article{border:1px solid var(--stage-divider);padding:13px;min-width:0}
.lesson-reveal small{color:var(--stage-signal)}.lesson-reveal h3{margin:5px 0;color:#f0f4f7;font:inherit;font-size:12px}
.lesson-reveal article p,.human-line{margin:6px 0 0;color:#a8bbcb;font-size:11px;line-height:1.65}.human-line{margin-top:13px}.human-line b{color:var(--stage-signal);font-weight:400}
.controlled-comparison{margin:18px 0;padding:20px;border:3px double var(--stage-signal);background:#101e30}
.controlled-comparison h2{margin:0;color:#f0f4f7;font:inherit;font-size:16px;line-height:1.55}
.controlled-comparison>div{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:15px}.controlled-comparison article{border:1px solid var(--stage-divider);padding:14px}
.controlled-comparison small,.controlled-comparison strong{display:block}.controlled-comparison small{color:var(--stage-signal);font-size:10px;letter-spacing:.08em}.controlled-comparison strong{margin-top:7px;color:#f0f4f7;font-size:22px;font-weight:400}
.controlled-comparison p{color:#c7d7e3;font-size:11px;line-height:1.7}.controlled-comparison article p{color:#a8bbcb}
.mission-unlocked{margin:24px 0;padding:20px;border:3px double var(--stage-signal);background:#102238}
.mission-unlocked p{max-width:72ch;color:#c7d7e3;line-height:1.7}.mission-unlocked form{margin-top:14px}.mission-unlocked .enter{min-height:44px;padding:10px 13px;background:#0d1c2d;color:#f0f4f7;border-color:var(--stage-signal)}
.lesson-notice{margin:18px 0;padding:18px;border:3px double var(--stage-signal);background:#101e30}.lesson-notice h2{margin:0;color:#f0f4f7;font:inherit;font-size:15px;line-height:1.55}.lesson-notice p:last-child{margin-bottom:0;color:#c7d7e3}
@media(max-width:760px){
  .arcade-vehicle{order:initial}.mission-status{grid-template-columns:1fr}.mission-status div+div{border-left:0;border-top:1px solid var(--stage-divider)}
  .lesson-reveal>div,.controlled-comparison>div{grid-template-columns:1fr}.lesson-reveal,.controlled-comparison,.mission-unlocked{padding:15px}
}

/* Save the Signal: fast, playable public front door. */
.arcade-main{max-width:1040px;margin:18px auto;padding:0 14px}.arcade-header{padding:7px 8px 6px}.arcade-header .wordmark{padding-bottom:6px;margin-bottom:5px}.game-name{color:#f0f4f7;font-size:12px;letter-spacing:.14em}.arcade-header .voice{margin-top:3px;color:#8fa6b8;font-size:9px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.game-progress{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin:9px 0}.game-progress span{border:1px solid var(--stage-divider);padding:5px;text-align:center;color:#8295a6;font-size:9px;letter-spacing:.12em}.game-progress .done{background:#17324a;color:#d4e0e9;border-color:var(--stage-rule)}.game-progress .active{color:#f0f4f7;border-color:var(--stage-signal);box-shadow:inset 0 -3px 0 var(--stage-signal)}
.game-shell{min-height:590px;border:3px double var(--stage-rule);background:radial-gradient(circle at 70% 25%,#132941 0,#0d1c2d 28%,#091426 68%);overflow:hidden}.game-panel{min-height:584px;padding:32px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}.game-kicker{color:var(--stage-signal);font-size:10px;letter-spacing:.13em}.game-panel h1{margin:8px 0 22px;color:#f0f4f7;font-size:clamp(24px,5vw,48px);line-height:1.12;letter-spacing:.05em}.game-button,.quiet-button{min-height:46px;border:2px solid var(--stage-signal);background:#16314a;color:#f0f4f7;font:inherit;font-weight:700;letter-spacing:.06em;padding:11px 18px;cursor:pointer}.game-button:hover,.game-button:focus-visible{background:#214461}.quiet-button{border:1px solid var(--stage-rule);background:transparent;color:var(--stage-signal);font-weight:400}.quiet-button:hover,.quiet-button:focus-visible{background:#102238;color:#f0f4f7}.source-drawer{margin-top:10px;padding:9px 0;color:#a8bbcb;font-size:10px;line-height:1.6}.source-drawer p{max-width:90ch}.lesson-notice{margin:9px 0;padding:10px 14px}.lesson-notice h2{font-size:12px}.lesson-notice p{font-size:10px}.arcade-main footer{margin-top:8px;padding:10px 0}

/* 1 · find the fault */
.scan-panel{justify-content:center}.scan-head{width:min(760px,100%);display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.game-status{color:#f0f4f7;font-size:18px;min-width:13ch;text-align:left}.scan-head .quiet-button{min-height:44px}.signal-window{position:relative;width:min(880px,100%);height:150px;border:1px solid var(--stage-rule);overflow:hidden;background:linear-gradient(180deg,#07101d,#102238)}.signal-window:before,.signal-window:after{content:"";position:absolute;z-index:3;top:0;bottom:0;width:15%;pointer-events:none}.signal-window:before{left:0;background:linear-gradient(90deg,#091426,transparent)}.signal-window:after{right:0;background:linear-gradient(-90deg,#091426,transparent)}.signal-track{position:absolute;inset:0 auto 0 0;display:flex;align-items:center;gap:18px;padding:0 80px;width:max-content;animation:signal-scroll 7s linear infinite}.signal-form{margin:0}.signal-token{position:relative;width:64px;height:76px;border:1px solid var(--stage-divider);background:#0d1c2d;color:#f0f4f7;font:inherit;font-size:42px;cursor:pointer}.signal-token span{text-decoration:overline;text-decoration-thickness:3px}.signal-token:hover,.signal-token:focus-visible{border-color:var(--stage-signal);background:#17324a}.signal-target{border:2px solid #f0f4f7}.signal-target.found{background:#d4e0e9;color:#091426;box-shadow:0 0 22px rgba(154,209,237,.65)}.signal-track.signal-misread{animation:signal-shake .35s linear,signal-scroll 7s linear infinite}.signal-track.signal-lost{animation-play-state:paused;opacity:.35}.signal-track.signal-restart{animation:none}.scan-retry{margin-top:16px}.noscript-note{color:#a8bbcb;font-size:11px}@keyframes signal-scroll{from{transform:translateX(0)}to{transform:translateX(-52%)}}@keyframes signal-shake{0%,100%{margin-top:0}25%{margin-top:-9px}75%{margin-top:9px}}

/* 2 · carry the warning into a real stop */
.carry-panel h1{margin-bottom:10px}.carry-run{position:relative;width:min(860px,100%);height:260px;border:1px solid var(--stage-rule);overflow:hidden;background:#07101d}.completion-cloud{position:absolute;inset:10px;display:flex;flex-wrap:wrap;align-content:flex-start;gap:8px;opacity:.45}.completion-cloud span{border:1px solid var(--stage-divider);padding:4px 7px;font-size:9px}.carry-line{position:absolute;left:8%;right:8%;bottom:58px;border-top:5px dotted var(--stage-rule)}.carry-checkpoints{position:absolute;left:23%;right:12%;bottom:43px;display:flex;justify-content:space-between}.carry-checkpoints i{display:grid;place-items:center;width:32px;height:32px;border:2px solid var(--stage-rule);border-radius:50%;background:#091426;color:var(--stage-signal);font-style:normal}.carry-checkpoints i.done{background:#d4e0e9;color:#091426;box-shadow:0 0 13px rgba(154,209,237,.5)}.carry-packet{position:absolute;z-index:2;left:7%;bottom:35px;width:118px;height:75px;border:2px solid #d4e0e9;background:#102238;display:grid;place-items:center;transition:left .24s ease-out}.carry-packet strong{font-size:12px}.carry-packet span{font-size:9px;color:#a8bbcb}.carry-packet b{position:absolute;right:-18px;top:-16px;padding:5px 7px;background:#d4e0e9;color:#091426;font-size:8px;transform:rotate(5deg)}.carry-panel[data-carry-step="1"] .carry-packet{left:27%}.carry-panel[data-carry-step="2"] .carry-packet{left:51%}.carry-panel[data-carry-step="3"] .carry-packet{left:75%}.carry-choice{display:grid;grid-template-columns:1fr 1fr;gap:9px;width:min(620px,100%);margin-top:16px}.carry-choice output{grid-column:1/-1;color:var(--stage-signal);font-size:12px}.carry-choice form,.carry-choice button{width:100%}.carry-complete{margin-top:10px}.carry-ready .no-script-carry{display:none}
.handoff-run{width:min(900px,100%);display:grid;grid-template-columns:minmax(220px,1fr) 180px 130px;gap:12px;align-items:center}.conveyor{height:100px;border-bottom:5px dotted var(--stage-rule);position:relative;overflow:hidden}.work-packet{position:absolute;left:58%;top:9px;width:108px;height:72px;border:2px solid #d4e0e9;background:#102238;display:grid;place-items:center;font-weight:700;animation:packet-to-dock .9s ease-out both}.work-packet small,.work-packet em{font-size:7px;font-style:normal;color:#a8bbcb}.work-packet em{color:var(--stage-signal)}.warning-tag{position:absolute;right:-12px;top:-17px;padding:4px 6px;background:#d4e0e9;color:#091426;font-size:8px;transform:rotate(7deg)}.dock,.degs-gate{height:112px;border:3px double var(--stage-rule);display:grid;place-items:center;padding:9px}.dock small,.degs-gate small{color:var(--stage-signal)}.dock strong,.degs-gate strong{font-size:11px}.degs-gate i{display:block;width:72px;border-top:6px solid #d4e0e9;transform:rotate(-8deg);box-shadow:0 0 10px rgba(212,224,233,.3)}.micro-sequence{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:16px 0 20px}.micro-sequence span{border:1px solid var(--stage-divider);padding:5px 8px;color:#d4e0e9;font-size:9px}.repair-board{width:min(700px,100%);display:grid;grid-template-columns:1fr 1fr 70px auto;gap:10px;align-items:stretch}.retained-candidate,.repair-target{min-height:110px;border:1px solid var(--stage-divider);display:grid;place-items:center;padding:8px}.retained-candidate{opacity:.72}.retained-candidate small,.repair-target small{color:var(--stage-signal);font-size:9px}.retained-candidate strong,.repair-target strong{font-size:48px}.repair-target{cursor:pointer;border:2px solid var(--stage-signal)}.bar-tool{align-self:center;width:64px;height:48px;border:2px solid var(--stage-signal);background:#16314a;color:#f0f4f7;font-size:30px;cursor:grab;touch-action:none;position:relative;z-index:5}.bar-tool:active{cursor:grabbing}.bar-selected .repair-target{box-shadow:0 0 16px rgba(154,209,237,.4)}.repair-board.repaired .repair-target strong{text-decoration:overline;text-decoration-thickness:3px}.apply-bar{align-self:center}.danger-choice{margin-top:16px}.danger{font-size:10px;border-style:dashed}@keyframes packet-to-dock{from{left:0}to{left:58%}}

/* Failure, repair, and human decision. */
.loss-sky{position:relative;width:min(760px,100%);height:260px;border:1px solid var(--stage-divider);overflow:hidden;background:radial-gradient(circle at 75% 25%,#29415b 0,#0d1c2d 12%,#07101d 50%)}.lost-packet{position:absolute;left:8%;top:45%;border:1px solid var(--stage-rule);padding:8px}.veer-line{position:absolute;left:18%;top:52%;width:56%;border-top:2px dashed var(--stage-rule);transform:rotate(-14deg);transform-origin:left}.lost-rocket{position:absolute;left:70%;top:20%;font-size:48px;transform:rotate(55deg);animation:rocket-veer 1.2s ease-in both}.range-line{position:absolute;right:8%;bottom:20%;border-top:4px solid #d4e0e9;width:140px;padding-top:5px;font-size:9px}.loss-code{margin:14px 0;color:#f0f4f7}.history-mini{margin-top:15px;max-width:680px;color:#a8bbcb;font-size:10px;text-align:left}.candidate-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:min(620px,100%)}.candidate{min-height:170px;border:1px solid var(--stage-divider);display:grid;place-items:center;padding:12px}.candidate small{color:var(--stage-signal)}.candidate strong{font-size:72px}.candidate.failed{opacity:.6}.candidate.passed{border:3px double var(--stage-signal)}.barred{text-decoration:overline;text-decoration-thickness:4px}.ready-gate{display:flex;align-items:center;gap:14px;margin:18px 0}.ready-gate i{display:block;width:80px;border-top:3px solid var(--stage-signal);transform:rotate(-20deg)}.ready-gate span{font-size:10px}.accept-button,.launch-button{min-width:220px;font-size:16px}.launch-key{display:flex;align-items:center;gap:25px;margin:30px 0}.launch-key i{display:block;width:90px;height:90px;border:8px double var(--stage-signal);border-radius:50%;box-shadow:0 0 25px rgba(154,209,237,.35)}.launch-key span{color:var(--stage-signal)}@keyframes rocket-veer{from{transform:translate(0,0) rotate(15deg)}to{transform:translate(90px,-65px) rotate(70deg);opacity:.35}}

/* 3 · one-input flight */
.flight-panel{padding-top:20px}.flight-panel h1{font-size:28px;margin-bottom:8px}.flight-hud{width:min(900px,100%);display:flex;justify-content:space-between;color:var(--stage-signal);margin-bottom:6px}.flight-field{position:relative;width:min(900px,100%);height:360px;border:2px solid var(--stage-rule);overflow:hidden;background:linear-gradient(180deg,#050b14,#0d1c2d);touch-action:none}.stars{position:absolute;inset:0;background-image:radial-gradient(#d4e0e9 1px,transparent 1px);background-size:41px 37px;opacity:.35}.flight-rocket{position:absolute;z-index:4;left:17%;top:50%;font-size:34px;color:#f0f4f7;transform:translate(-50%,-50%) rotate(90deg);transition:top .04s linear}.telemetry-gate{position:absolute;z-index:3;left:110%;top:0;width:46px;height:100%}.telemetry-gate i,.telemetry-gate b{position:absolute;left:0;width:100%;background:repeating-linear-gradient(90deg,#9ad1ed 0 5px,#17324a 5px 10px);border:1px solid #d4e0e9}.telemetry-gate i{top:0;height:calc((var(--gap) - 18)*1%)}.telemetry-gate b{bottom:0;height:calc((82 - var(--gap))*1%)}.telemetry-gate span{position:absolute;top:calc(var(--gap)*1%);left:50%;transform:translate(-50%,-50%);color:var(--stage-signal);font-size:10px}.venus{position:absolute;right:3%;top:12%;width:74px;height:74px;border:2px solid var(--stage-signal);border-radius:50%;display:grid;place-items:center;color:var(--stage-signal);font-size:9px;box-shadow:inset -16px -9px 0 #17324a}.thrust-button{margin-top:13px;min-width:260px;user-select:none;touch-action:none}.thrust-button.pressed{background:#d4e0e9;color:#091426}.flight-complete{margin-top:7px}.flight-ready .no-script-flight{display:none}.flight-lost .flight-field{border-color:#f0f4f7;opacity:.65}.flight-lost .flight-rocket{transform:translate(-50%,-50%) rotate(145deg)}

/* Win, explanation only after play, and responsive/access modes. */
.win-panel{justify-content:flex-start;padding-top:42px}.final-score{display:grid;place-items:center;width:190px;height:110px;border:3px double var(--stage-signal);margin:5px 0 18px}.final-score small{color:var(--stage-signal)}.final-score strong{font-size:38px}.win-actions{display:flex;gap:9px}.win-actions form{margin:0}.post-win{width:min(850px,100%);margin-top:13px;border:1px solid var(--stage-divider);padding:10px;text-align:left}.post-win ol{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;list-style:none;padding:0}.post-win li{border:1px solid var(--stage-divider);padding:9px}.post-win b,.post-win span{display:block}.post-win b{color:var(--stage-signal);font-size:9px}.post-win span,.post-win p{margin-top:5px;color:#a8bbcb;font-size:10px}.terminal-post{border:3px double var(--stage-rule);background:#07101d}.terminal-tape{margin-top:10px;padding:12px;border-top:1px solid var(--stage-divider);color:#d4e0e9}.terminal-tape p{margin:0 0 10px;color:var(--stage-signal)}.terminal-tape dl{display:grid;gap:6px;margin:0}.terminal-tape dl div{display:grid;grid-template-columns:1fr 1fr;gap:10px}.terminal-tape dt,.terminal-tape dd{margin:0;font-size:10px}.terminal-tape dd{color:var(--stage-signal);text-align:right}
@media(prefers-reduced-motion:no-preference){.phase-blocked .degs-gate i{animation:gate-slam .45s .65s ease-in both}.phase-lost .loss-sky{animation:loss-flash .25s 1.05s linear 2}}@keyframes gate-slam{from{transform:rotate(-75deg)}to{transform:rotate(-8deg)}}@keyframes loss-flash{50%{background:#d4e0e9}}@media(prefers-reduced-motion:reduce){.signal-track,.work-packet,.lost-rocket,.phase-blocked .degs-gate i,.phase-lost .loss-sky{animation:none!important}.signal-track{position:static;flex-wrap:wrap;justify-content:center;width:auto;padding:8px}.signal-window{height:auto}.flight-field{height:230px}.telemetry-gate{left:calc(25%*var(--gate-index,1))!important}.flight-rocket{top:50%!important}}
@media(max-width:760px){.arcade-main{margin:8px auto;padding:0 7px}.arcade-header .voice{display:none}.game-shell{min-height:calc(100vh - 145px)}.game-panel{min-height:calc(100vh - 151px);padding:18px 11px}.game-panel h1{font-size:28px;margin-bottom:15px}.signal-window{height:126px}.signal-track{gap:10px;padding:0 35px}.signal-token{width:52px;height:64px;font-size:34px}.carry-run{height:240px}.carry-packet{width:88px}.carry-checkpoints{left:38%;right:5%}.carry-panel[data-carry-step="1"] .carry-packet{left:24%}.carry-panel[data-carry-step="2"] .carry-packet{left:48%}.carry-panel[data-carry-step="3"] .carry-packet{left:68%}.handoff-run{grid-template-columns:1fr 100px 82px;gap:5px}.dock,.degs-gate{height:94px;padding:4px}.dock strong,.degs-gate strong{font-size:8px}.repair-board{grid-template-columns:1fr 1fr}.bar-tool,.apply-bar{width:100%}.flight-field{height:340px}.post-win ol{grid-template-columns:1fr 1fr}.win-actions{display:grid;width:100%}.win-actions button{width:100%}.game-progress span{font-size:8px;padding:4px}.source-drawer{font-size:9px}}
@media(max-width:410px){.handoff-run{grid-template-columns:1fr 80px 70px}.work-packet{width:84px}.warning-tag{right:-3px}.candidate strong{font-size:52px}.ready-gate{gap:7px}.ready-gate i{width:35px}.post-win ol{grid-template-columns:1fr}.launch-key{gap:12px}.launch-key i{width:72px;height:72px}}
@media(forced-colors:active){.game-shell,.signal-window,.dock,.degs-gate,.candidate,.flight-field,.post-win,.final-score{border-color:CanvasText}.game-button,.quiet-button,.signal-token,.bar-tool{border-color:ButtonText}.warning-tag{background:Highlight;color:HighlightText}}
.telemetry-gate i{height:var(--top)}.telemetry-gate b{height:var(--bottom)}
.telemetry-gate[data-gate="1"]{--gap:32;--top:14%;--bottom:50%;--gate-index:1}
.telemetry-gate[data-gate="2"]{--gap:67;--top:49%;--bottom:15%;--gate-index:2}
.telemetry-gate[data-gate="3"]{--gap:43;--top:25%;--bottom:39%;--gate-index:3}