/* RTPL Aviation: code-led editorial / engineering surface. Header/footer sources are frozen copies. */
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.measurement-head,.measurement-ledger>div{display:grid;grid-template-columns:minmax(0,.65fr) minmax(0,1.22fr) minmax(0,.9fr);column-gap:48px}.measurement-head{font-size:14px;color:var(--muted);padding-bottom:14px}.measurement-ledger>div{border-top:1px solid var(--rule);padding-block:27px}.measurement-ledger>div:last-child{border-bottom:1px solid var(--rule)}.measurement-ledger dt{font:500 23px/1.2 var(--display);letter-spacing:-.02em}.measurement-ledger dd{font-size:15px;line-height:1.7;color:var(--muted)}.family{display:flex;flex-direction:column;align-items:flex-start;gap:3px}.family a{display:inline-block;min-height:38px;padding-block:6px;line-height:1.45;text-decoration:none}.family a:hover{text-decoration:underline}.family a span{margin-left:7px}.surface-note{margin-top:42px!important;padding:28px 32px;background:#eaf0f3;display:grid;grid-template-columns:minmax(0,.65fr) minmax(0,1.22fr) minmax(0,.9fr);gap:48px}.surface-note h3{font:500 25px/1.2 var(--display);letter-spacing:-.02em}.surface-note p{font-size:14px;color:var(--muted);line-height:1.7}.surface-note a{font-size:14px;line-height:1.5;display:flex;align-items:flex-start;justify-content:space-between;gap:15px;text-decoration:none;padding-block:5px}.surface-note a:hover{text-decoration:underline}
.information .section-heading{grid-template-columns:1.2fr .8fr}.information-chain{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));list-style:none;padding:0;margin-top:62px!important;border-top:1px solid #56707f;gap:30px}.information-chain li{position:relative;padding-top:28px}.information-chain li:not(:last-child):after{content:"";position:absolute;right:-20px;top:-5px;width:9px;height:9px;border-top:1px solid #74ccec;border-right:1px solid #74ccec;transform:rotate(45deg)}.chain-symbol{display:block;width:42px;height:42px;color:#74ccec;margin-bottom:24px}.chain-symbol svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.2;stroke-linecap:round;stroke-linejoin:round}.information-chain h3{font-size:18px;line-height:1.3;letter-spacing:-.01em;margin-bottom:13px}.information-chain p{font-size:14px;line-height:1.65;color:var(--dark-muted)}.information-chain a{display:inline-block;min-height:44px;padding-top:16px;font-size:14px;line-height:1.5}.system-paths{border-top:1px solid var(--rule)}.system-paths>a{display:grid;grid-template-columns:minmax(0,.65fr) minmax(0,1.22fr) minmax(0,.9fr);gap:48px;align-items:center;padding-block:30px;border-bottom:1px solid var(--rule);text-decoration:none;transition:background-color 160ms var(--ease)}.system-paths>a:hover{background:#eaf0f3}.system-paths h3{color:var(--ink);font-size:29px;line-height:1.15}.system-paths p{color:var(--muted);font-size:16px;line-height:1.6}.system-paths span{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:14px;color:var(--link)}
.continuity{background:#eaf0f3;border-block:1px solid var(--rule)}.continuity-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:100px}.continuity-layout .intro{margin-top:28px!important}.continuity-layout>div>p:not(.intro){margin-top:22px!important;color:var(--muted);font-size:16px;line-height:1.75}.continuity-layout .text-link{margin-top:20px}.continuity-questions>div{padding-block:24px;border-top:1px solid #b4c3cd}.continuity-questions>div:first-child{padding-top:0;border:0}.continuity-questions dt{font-size:18px;font-weight:500;line-height:1.35;margin-bottom:12px}.continuity-questions dd{font-size:15px;color:var(--muted);line-height:1.7}.knowledge-list{border-top:1px solid var(--rule)}.knowledge-list details{border-bottom:1px solid var(--rule)}.knowledge-list summary{display:flex;align-items:center;justify-content:space-between;gap:28px;list-style:none;min-height:90px;padding:22px 0;font:500 29px/1.2 var(--display);letter-spacing:-.02em}.knowledge-list summary::-webkit-details-marker{display:none}.knowledge-list summary:hover{color:var(--link)}.knowledge-list summary svg{width:20px;height:20px;stroke:var(--link);stroke-width:1.5;fill:none;transition:transform 160ms var(--ease)}.knowledge-list details[open] summary svg{transform:rotate(45deg)}.knowledge-list details>div{padding:0 50px 30px 0;max-width:760px}.knowledge-list details p{font-size:16px;color:var(--muted);margin-bottom:15px!important}.knowledge-list details a{display:block;width:fit-content;padding-block:9px;min-height:40px;font-size:14px}
.requirement-layout{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:100px}.requirement-layout .intro{margin-top:28px!important}.requirement-layout>div>p:not(.intro){font-size:16px;color:var(--dark-muted);margin-top:20px!important;max-width:40ch}.requirement-layout>div>.button{margin-top:32px}.brief-panel{padding:30px 32px;border:1px solid var(--dark-rule);background:#111e27}.brief-panel h3{font-size:23px}.brief-panel>p{font-size:14px;margin-top:10px!important;color:var(--dark-muted)}.brief-panel ol{padding-left:20px;margin-block:22px!important;font-size:14px;color:var(--dark-muted);line-height:1.8}.brief-panel label{display:block;font-size:14px;font-weight:500;margin-block:18px 8px}.brief-panel label span{font-weight:400;color:var(--dark-muted)}.brief-panel select,.brief-panel textarea{display:block;width:100%;color:var(--paper);background:#172630;border:1px solid #56707f;border-radius:2px;padding:12px;font-size:15px;line-height:1.5;max-width:100%;min-width:0}.brief-panel textarea{resize:vertical;min-height:100px}.brief-panel textarea::placeholder{color:#a7bac7;opacity:1}.secondary{background:transparent;border-color:#74ccec;color:#cde9f4;margin-top:20px}.secondary:hover{background:#233b49}.brief-status{color:var(--dark-muted);font-size:14px;margin-top:14px!important;min-height:36px}.prototype-note{padding-block:25px;font-size:14px;color:var(--muted)}.prototype-note p{max-width:100%;margin-block:4px}main [hidden]{display:none!important}
@media(min-width:1600px){.hero{height:900px}.hero-content{padding-bottom:90px}}
@media(max-width:1180px){.shell{width:calc(100% - 80px)}.section-heading{gap:44px}.flight-layout{gap:44px;grid-template-columns:1.1fr .9fr}.hero{height:800px}.hero-content{padding-bottom:60px}.hero-bottom{gap:36px}.hero-bottom>p{font-size:18px}.measurement-head,.measurement-ledger>div,.system-paths>a{column-gap:30px;grid-template-columns:.7fr 1.15fr .9fr}.surface-note{gap:30px;padding:25px;grid-template-columns:.7fr 1.15fr .9fr}.continuity-layout,.requirement-layout{gap:64px}.information-chain{gap:22px}.information-chain h3{font-size:16px}.information-chain p{font-size:14px}}
@media(max-width:960px){.section{padding-block:76px}.shell{width:calc(100% - 64px)}.hero{height:850px;min-height:760px}.hero-content{padding-top:140px}.hero h1{font-size:70px}.hero-bottom{display:grid;grid-template-columns:1fr;gap:28px;margin-top:32px}.hero-bottom>p{max-width:42ch}.hero-actions{flex-direction:row;align-items:center;gap:25px}.section-heading{gap:35px;grid-template-columns:1fr 1fr}.stakeholders{gap:28px}.flight-layout{display:block}.airport-stage{position:relative;top:auto;border-top:0}.stage-title,.airport-map,.stage-note{display:none}.phase-nav{margin:0 0 40px;grid-template-columns:repeat(4,minmax(0,1fr));background:var(--ink)}.phase-nav a{min-height:52px}.phase-articles{display:grid;grid-template-columns:1fr 1fr;gap:40px}.phase-articles article{min-height:0;padding:24px 0 32px;border-top:1px solid var(--dark-rule)}.phase-articles article+article{padding-top:24px}.phase-measures>div{display:block}.phase-measures dd{margin-top:5px}.measurement-head,.measurement-ledger>div{grid-template-columns:.7fr 1.3fr;column-gap:32px}.measurement-head span:last-child{display:none}.measurement-ledger .family{grid-column:2;margin-top:8px}.family a{min-height:44px}.surface-note{grid-template-columns:.7fr 1.3fr;gap:22px 32px}.surface-note a{grid-column:2}.information .section-heading{grid-template-columns:1fr 1fr}.information-chain{grid-template-columns:repeat(3,minmax(0,1fr));gap:38px}.information-chain li:nth-child(3):after{display:none}.information-chain li:nth-child(n+4){border-top:1px solid #56707f}.system-paths>a{grid-template-columns:.75fr 1.25fr;gap:14px 35px}.system-paths span{grid-column:2;justify-content:flex-start}.continuity-layout,.requirement-layout{gap:44px}.brief-panel{padding:26px 24px}.continuity-questions dt{font-size:17px}.continuity-questions dd{font-size:14px}}
@media(max-width:700px){body{font-size:16px}.shell{width:calc(100% - 40px)}.section{padding-block:60px}main h2{font-size:37px;line-height:1.08;letter-spacing:-.03em}.section-heading{display:block;margin-bottom:32px}.section-heading>p,.section-heading>div{margin-top:24px!important}.section-heading>p,.section-heading>div>p{font-size:16px;line-height:1.65;padding:0}.hero{height:auto;min-height:780px;min-height:100svh}.hero-content{padding-top:158px;padding-bottom:42px}.hero-image img{object-position:65% center}.hero-shade{background:linear-gradient(0deg,rgba(5,12,20,.83),rgba(5,12,20,.36) 76%)}.breadcrumb{font-size:14px;margin-bottom:30px;gap:12px}.hero h1{font-size:clamp(46px,11.6vw,70px);line-height:1.07;max-width:100%;letter-spacing:-.035em}.hero-bottom{margin-top:28px;gap:28px}.hero-bottom>p{font-size:17px;line-height:1.65;max-width:34ch}.hero-actions{display:flex;flex-direction:column;align-items:flex-start;gap:8px}.hero-caption{font-size:14px;line-height:1.5;align-items:flex-start;padding-block:15px}.hero-caption span:first-child{max-width:22ch}.hero-caption span:last-child{max-width:16ch;text-align:right}.page-nav .shell{display:grid;grid-template-columns:1fr 1fr;gap:0 18px;padding-block:10px}.page-nav a{min-height:44px;font-size:14px}.stakeholders{display:block;padding:0}.stakeholders>div{padding-block:24px}.stakeholders>div+div{border-top:1px solid var(--rule)}.stakeholders dt{font-size:16px}.stakeholders dd{font-size:15px}.source-note{font-size:14px!important}.flight-story .section-heading{margin-bottom:30px}.quiet-button{margin-top:18px}.phase-nav{grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:10px}.phase-nav a{min-height:48px;justify-content:flex-start;padding-inline:14px;border-bottom:1px solid var(--dark-rule);font-size:14px}.phase-nav a[aria-current]{border-bottom:2px solid var(--cyan)}.phase-articles{display:block}.phase-articles article{padding-block:35px 40px}.phase-articles article+article{padding-top:35px}.phase-heading{gap:15px;margin-bottom:18px}.phase-heading h3{font-size:33px}.phase-question{font-size:20px}.phase-articles article>p:not(.phase-question){font-size:15px}.phase-measures{font-size:14px}.phase-measures>div{display:grid;grid-template-columns:89px minmax(0,1fr);gap:12px;margin-top:12px}.phase-measures dd{margin:0}.measurement-head{display:none}.measurement-ledger>div{grid-template-columns:1fr;padding-block:26px;gap:14px}.measurement-ledger dt{font-size:27px}.measurement-ledger dd{font-size:15px}.measurement-ledger .family{grid-column:auto;margin-top:0}.family a{font-size:14px;min-height:44px;padding-block:11px}.surface-note{display:block;padding:25px 22px;margin-top:28px!important}.surface-note h3{font-size:28px;max-width:20ch;margin-bottom:18px}.surface-note p{font-size:14px}.surface-note a{margin-top:18px;font-size:14px}.information .section-heading{display:block}.information-chain{grid-template-columns:1fr;gap:0;border-top:0;margin-top:35px!important}.information-chain li{display:grid;grid-template-columns:44px minmax(0,1fr);gap:0 24px;padding-block:23px;border-top:1px solid var(--dark-rule)!important}.information-chain li:after{display:none}.chain-symbol{grid-row:1/4;margin:0;width:36px;height:36px}.information-chain h3{font-size:18px;margin-bottom:8px}.information-chain p{font-size:14px}.information-chain a{grid-column:2;font-size:14px;min-height:44px;padding-top:12px}.system-paths>a{grid-template-columns:1fr;gap:14px;padding-block:28px}.system-paths h3{font-size:29px}.system-paths p{font-size:15px}.system-paths span{grid-column:auto;font-size:14px;justify-content:space-between;min-height:35px}.continuity-layout,.requirement-layout{display:block}.continuity-layout .intro,.requirement-layout .intro{font-size:20px;margin-top:24px!important}.continuity-questions{margin-top:40px!important}.continuity-questions>div:first-child{border-top:1px solid #b4c3cd;padding-top:24px}.continuity-questions dt{font-size:18px}.continuity-questions dd{font-size:15px}.knowledge-list summary{font-size:25px;min-height:92px;gap:20px;padding-block:23px}.knowledge-list details>div{padding:0 0 25px}.knowledge-list details p{font-size:15px}.knowledge-list details a{font-size:14px;min-height:44px}.brief-panel{margin-top:42px;padding:26px 22px}.brief-panel select,.brief-panel textarea{font-size:16px}.prototype-note{font-size:14px;padding-block:22px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}main *,main *:before,main *:after{transition:none!important;animation:none!important}.airport-stage{position:relative;top:auto}.phase-layer{opacity:1}.phase-layer text{display:none}}

.family-arrow{display:inline-block;width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.4;vertical-align:middle;margin-left:7px}
@media(min-width:961px){.phase-articles article:last-child{min-height:650px}}

/* Final QA: avoid shrinking the airport labels below readable size on tablets. */
@media(max-width:1100px){
 .flight-layout{display:block}
 .airport-stage{position:relative;top:auto;border-top:0}
 .stage-title,.airport-map,.stage-note{display:none}
 .phase-nav{margin:0 0 40px;background:var(--ink)}
 .phase-nav a{min-height:52px}
 .phase-articles{display:grid;grid-template-columns:1fr 1fr;gap:40px}
 .phase-articles article,.phase-articles article:last-child{min-height:0;padding:24px 0 32px;border-top:1px solid var(--dark-rule)}
 .phase-articles article+article{padding-top:24px}
}
@media(max-width:700px){
 .phase-nav{margin-bottom:10px}
 .phase-nav a{min-height:48px}
 .phase-articles{display:block}
 .phase-articles article,.phase-articles article:last-child{padding-block:35px 40px}
 .phase-articles article+article{padding-top:35px}
}