:root{color-scheme:dark;--bg:#0c151c;--panel:#101d26;--ink:#edf1ef;--muted:#a2b1b9;--line:#2c3b44;--accent:#9ec4cb;font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink)}button,input,a{-webkit-tap-highlight-color:transparent}a{color:var(--accent)}button{font:inherit;color:inherit;background:none;border:1px solid var(--line);cursor:pointer}button:hover{background:#22333e;border-color:#7497a5}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:4px}[hidden]{display:none!important}.skip-link{position:fixed;top:-100px;left:20px;z-index:30;background:var(--panel);padding:12px}.skip-link:focus{top:8px}.masthead{height:74px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:0 30px;background:#0d1720}.wordmark{display:flex;gap:17px;align-items:center;text-decoration:none;font-size:12px;letter-spacing:.15em;color:var(--ink);font-weight:600}.wordmark small{display:block;margin-top:4px;font-size:9px;letter-spacing:.19em;color:var(--muted)}.mark{font:42px/1 Georgia,serif;letter-spacing:-.14em;color:var(--accent)}.masthead nav{display:flex;gap:7px}.masthead nav a{padding:7px 15px;color:var(--muted);text-decoration:none;font-size:13px}.masthead nav a[aria-current]{border:1px solid #4c646f;color:var(--ink);background:#192b36}main{height:calc(100dvh - 74px);display:grid;grid-template-columns:304px 1fr}aside{padding:27px 25px 22px;border-right:1px solid var(--line);overflow-y:auto;scrollbar-width:thin;background:linear-gradient(150deg,#172631,#0e1922 80%)}.eyebrow{font:10px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.14em;color:var(--accent);margin:0 0 17px}h1{font:400 40px/1.03 "Iowan Old Style",Baskerville,Georgia,serif;letter-spacing:-.03em;margin:0 0 17px}.introduction{color:#b2c0c7;font-size:14px;line-height:1.65;margin:0 0 23px}.metrics{display:grid;grid-template-columns:.75fr 1fr;gap:14px;margin:0 0 23px;padding:16px 0;border-block:1px solid var(--line)}.metrics div:last-child{grid-column:1/-1;display:flex;justify-content:space-between;align-items:baseline}.metrics dt{font-size:11px;color:var(--muted)}.metrics dd{font:30px/1.2 Georgia,serif;margin:4px 0 0}.metrics dd small{font:13px/1.2 system-ui;color:var(--muted)}.metrics div:last-child dd{font-size:22px}fieldset{padding:0;border:0;margin:0 0 22px}legend{font-size:12px;margin-bottom:10px;color:#bfcbd0}.view-modes>div{display:grid;grid-template-columns:repeat(3,1fr);gap:3px}.view-modes button{font-size:12px;padding:8px 2px}.view-modes button[aria-pressed=true],.camera-views button[aria-pressed=true]{color:#0c1a22;background:#a5c6cc;border-color:#a5c6cc}.view-description{min-height:106px}.view-description h2{font:400 20px/1.2 Georgia,serif;margin:0 0 10px}.view-description p{font-size:12px;color:var(--muted);line-height:1.6;margin:0 0 19px}.layers label{display:flex;align-items:center;gap:8px;margin:9px 0;font-size:12px;cursor:pointer}.layers input{accent-color:var(--accent);margin:0;width:15px;height:15px}.layers label span{margin-left:auto;color:#8198a4;font:10px ui-monospace,Menlo,monospace}.slice-control{border-top:1px solid var(--line);padding-top:17px}.slice-control label{display:flex;justify-content:space-between;font-size:12px;margin-bottom:12px}.slice-control output{color:var(--accent);font:12px ui-monospace,Menlo,monospace}.slice-control input{width:100%;margin:0;accent-color:var(--accent);cursor:pointer}.slice-control>div{display:flex;justify-content:space-between;font-size:10px;color:var(--muted);margin-top:7px;align-items:center}.slice-control button{font-size:10px;padding:3px 0;border:0;color:var(--accent)}.source-button{display:flex;justify-content:space-between;width:100%;padding:14px 0;border:0;border-top:1px solid var(--line);margin-top:22px;text-align:left;font-size:12px;color:var(--accent)}.progress-note{font:10px/1.6 ui-monospace,Menlo,monospace;color:#849daa;margin:15px 0 0}.progress-note span{color:#637d8b}.stage{position:relative;min-width:0;overflow:hidden;background:radial-gradient(ellipse at 50% 38%,#283940,#101c25 65%)}#viewport{position:absolute;inset:0}canvas{display:block;width:100%;height:100%;touch-action:none;outline:0}.stage-heading{position:absolute;top:26px;left:28px;right:26px;display:flex;justify-content:space-between;pointer-events:none}.stage-heading .eyebrow{color:#8ea6af}.stage-tag{font:10px/1.5 ui-monospace,Menlo,monospace;letter-spacing:.13em;color:#647d89}.camera-views{position:absolute;left:28px;top:63px;display:flex;gap:4px}.camera-views button{background:#13222cdc;padding:6px 12px;font-size:11px}.viewport-actions{position:absolute;right:23px;top:62px;display:grid;gap:5px}.viewport-actions button{width:34px;height:34px;background:#142530cb;font-size:22px}.stage-footer{position:absolute;bottom:23px;left:28px;right:26px;display:flex;justify-content:space-between;align-items:end;color:#91a6af;pointer-events:none;font-size:11px}.stage-footer>div{display:flex;align-items:center;gap:8px}.stage-footer p{font-size:11px;line-height:1.7;text-align:right;margin:0}.stage-footer p span{font-size:10px;color:#6d8895}.legend-dot{display:block;width:6px;height:6px;background:#c8b9a9;border-radius:50%}.north-indicator{position:absolute;left:28px;bottom:62px;display:flex;flex-direction:column;align-items:center;gap:5px;color:#9bb2bb;font:10px ui-monospace,Menlo,monospace;pointer-events:none}.north-indicator>span:first-child{font-size:25px;display:block;line-height:1}.north-indicator>span:last-child{font-size:10px}#loading{position:absolute;top:48%;left:20px;right:20px;text-align:center;color:#acc5ce;font-size:14px}#loading.error{background:#12232e;padding:24px;max-width:480px;margin:0 auto;border:1px solid #4e626c}#column-inspector{border:1px solid #526f7c;background:#1a303b;padding:14px;margin-top:18px;position:relative}#column-inspector h2{font:23px/1.2 Georgia,serif;margin:4px 0 10px}#column-inspector p:last-child{font-size:12px;color:#b7c7cf;margin:0}#column-inspector .eyebrow{margin:0}#clear-selection{position:absolute;right:6px;top:5px;border:0;font-size:20px;width:26px;height:26px}dialog{background:#12212b;color:var(--ink);border:1px solid #4f6773;max-width:min(640px,calc(100vw - 32px));max-height:85dvh;overflow:auto;padding:32px}dialog::backdrop{background:#030a11d9;backdrop-filter:blur(5px)}dialog h2{font:32px/1.1 Georgia,serif;margin:10px 0 20px}dialog>p:not(.eyebrow){font-size:14px;color:#b1c1ca}.dialog-close{float:right;font-size:25px;width:32px;height:32px;border:0;margin:-15px -15px 0 10px}.scope-list div{border-top:1px solid var(--line);padding:14px 0;display:grid;grid-template-columns:80px 1fr;gap:10px}.scope-list dt{font-size:13px;color:#e0e7e9}.scope-list dd{font-size:12px;color:#a7b9c3;margin:0}.source-links{display:grid;gap:12px;border-top:1px solid var(--line);padding-top:18px;font-size:12px}.stage:fullscreen{width:100vw;height:100dvh;background:#172731}
@media(min-width:1600px){main{grid-template-columns:340px 1fr}aside{padding:33px 31px}h1{font-size:46px}.introduction{font-size:15px}}
@media(max-width:800px){.masthead{height:60px;padding:0 17px}.wordmark{font-size:10px;gap:12px}.wordmark small{font-size:8px}.mark{font-size:34px}.masthead nav a{font-size:11px;padding:6px 9px}main{height:auto;min-height:calc(100dvh - 60px);display:flex;flex-direction:column}.stage{height:66dvh;min-height:440px;order:0;flex:none}aside{order:1;overflow:visible;padding:23px;border-right:0;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:0 22px}aside>.eyebrow,aside>h1,aside>.introduction{grid-column:1/-1}h1{font-size:36px}h1 br{display:none}h1 br:after{content:' '}.introduction{max-width:560px}.metrics{grid-column:1/-1;grid-template-columns:repeat(3,1fr)}.metrics div:last-child{display:block;grid-column:auto}.metrics div:last-child dd{font-size:30px}.view-modes,.view-description{grid-column:1/-1}.view-description{min-height:75px}.view-modes{max-width:500px}.layers,.slice-control{grid-column:auto}.source-button,.progress-note,#column-inspector{grid-column:1/-1}.stage-heading{top:18px;left:18px;right:18px}.camera-views{left:18px;top:47px}.camera-views button{padding:6px 9px;font-size:10px}.viewport-actions{right:14px;top:88px}.stage-footer{bottom:17px;left:18px;right:18px}.stage-footer p{font-size:9px}.stage-footer p span{display:none}.north-indicator{left:19px;bottom:53px}.stage-tag{font-size:9px}}
@media(max-width:430px){.masthead nav a{padding:5px 7px}.wordmark{letter-spacing:.1em}.wordmark small{letter-spacing:.1em}.stage{height:64dvh;min-height:405px}.stage-footer{font-size:10px}.metrics dt{font-size:10px}.metrics dd,.metrics div:last-child dd{font-size:27px}.layers,.slice-control{grid-column:1/-1}h1{font-size:34px}.scope-list div{grid-template-columns:1fr;gap:5px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

#member-source{display:inline-block;font-size:11px;margin-top:12px}#column-detail{font-size:12px;color:#b7c7cf;line-height:1.6}.view-modes button{white-space:nowrap}

.layers label:has(input:disabled){opacity:.45;cursor:default}
.lower-levels{position:absolute;left:28px;right:70px;top:109px;max-width:530px}.lower-levels>div{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}.lower-levels button{background:#13222cdd;font-size:10px;padding:6px 4px;line-height:1.5}.lower-levels button b{display:block;font:15px/1.2 Georgia,serif}.lower-levels button[aria-pressed=true]{background:#a5c6cc;color:#0c1a22;border-color:#a5c6cc}.lower-levels p{font-size:11px;line-height:1.5;color:#aec3cc;margin:9px 0 0;max-width:450px;text-wrap:pretty}.level-reference-key{position:absolute;left:53px;bottom:63px;margin:0;font:10px/1.5 ui-monospace,Menlo,monospace;color:#8fb3c0;pointer-events:none}.level-reference-key span{display:inline-block;width:14px;border-top:1px solid #99ccd6;vertical-align:middle;margin-right:5px}@media(max-width:800px){.lower-levels{left:18px;right:61px;top:88px;max-width:460px}.lower-levels button{font-size:9px;padding:4px 2px}.lower-levels button b{font-size:13px}.lower-levels p{font-size:10px;line-height:1.4;margin-top:6px}.level-reference-key{left:43px;bottom:54px;font-size:9px}}

.lower-levels .lower-level-heading{font:9px/1.3 ui-monospace,Menlo,monospace;letter-spacing:.09em;color:#829da9;margin:0 0 7px}@media(max-width:800px){.lower-levels .lower-level-heading{font-size:8px;margin-bottom:4px}}
@media(max-width:800px){.stage[data-lower-levels=true] #viewport{top:105px}}
.stage[data-context=true] #viewport{top:202px;bottom:164px}
#context-pins{position:absolute;inset:0;z-index:2;pointer-events:none}
.context-pin{position:absolute;transform:translate(-50%,-50%);width:28px;height:28px;padding:0;border:1px solid var(--context-color);border-radius:50%;background:#10232ef2;color:var(--context-color);font:600 12px/26px ui-monospace,Menlo,monospace;pointer-events:auto;box-shadow:0 0 0 4px #10232e66}
.context-pin:hover{background:#29434e;box-shadow:0 0 0 5px #10232e99}
.lower-context-key{position:absolute;bottom:20px;left:28px;right:26px;max-width:850px;padding:12px;background:#0e1d27ed;border:1px solid #3a525e;border-radius:4px}
.lower-context-key>p{display:flex;justify-content:space-between;gap:8px;margin:0 0 9px;font:9px/1.4 ui-monospace,Menlo,monospace;letter-spacing:.04em;color:#c3d2d8}
.lower-context-key>p>span{color:#89a7b5;letter-spacing:0}
.lower-context-key>div{display:flex;gap:7px}
.lower-context-key button{display:flex;align-items:flex-start;gap:8px;flex:1;text-align:left;padding:9px 7px;border-color:#354c59;background:#172a35;line-height:1.35;min-width:0}
.lower-context-key button>b{display:block;flex:none;text-align:center;width:20px;height:20px;border:1px solid var(--context-color);color:var(--context-color);border-radius:50%;font:11px/18px ui-monospace,Menlo,monospace}
.lower-context-key button>span{font-size:11px;color:var(--context-color)}
.lower-context-key small{display:block;margin-top:5px;font-size:10px;line-height:1.4;color:#a7bdc8}
.stage[data-context=true] .stage-footer{display:none}
.stage[data-context=true] .north-indicator{bottom:145px}
.stage[data-context=true] .level-reference-key{bottom:146px}
@media(max-width:800px){.stage[data-context=true]{min-height:630px}.stage[data-context=true] #viewport{top:189px;bottom:177px}.lower-context-key{left:14px;right:14px;bottom:14px;padding:10px}.lower-context-key>div{gap:5px}.lower-context-key button{display:block;padding:7px 6px}.lower-context-key button>b{margin-bottom:5px}.lower-context-key button>span{font-size:10px}.lower-context-key small{font-size:9px}.lower-context-key>p{font-size:8px}.lower-context-key>p>span{max-width:145px;text-align:right}.stage[data-context=true] .north-indicator{bottom:158px}.stage[data-context=true] .level-reference-key{bottom:159px}}

/* NIST study keeps the original steel model as the primary view. */
.study-switch{display:grid;grid-template-columns:1fr 1fr;gap:4px;margin:20px 0 18px}
.study-switch button{padding:9px 7px;border:1px solid #435d68;background:#172a35;color:#abc0c9;font-size:11px;line-height:1.35}
.study-switch button[aria-pressed="true"]{background:#aacbd1;border-color:#aacbd1;color:#102029}
.nist-controls[hidden],.nist-stage-note[hidden]{display:none}
body[data-wtc7-study="true"] #building-controls>:is(.metrics,.view-modes,.view-description,.layers,.slice-control,#column-inspector,.source-button,.progress-note){display:none}
body[data-wtc7-study="true"] .stage :is(.camera-views,.lower-levels,.lower-context-key,.stage-footer,.level-reference-key){display:none}
body[data-wtc7-study="true"] .stage #viewport{top:0;bottom:0}
body[data-wtc7-study="true"] .stage .viewport-actions{top:96px}
.nist-scene-status{color:#a6bcc3;font:10px/1.5 ui-monospace,Menlo,monospace;margin:6px 0 0}
#nist-state-title{font:23px/1.15 Georgia,serif;color:#f2f0e9;margin:8px 0}
#nist-state-description{font-size:13px;line-height:1.6;color:#c8d7da;margin:0}
.nist-time-note{font:10px/1.55 ui-monospace,Menlo,monospace;color:#9eb6c0;border-left:2px solid #6d919d;padding-left:9px;margin:12px 0 16px}
.nist-orientation-guide{margin:0 0 16px;padding:10px 11px;border:1px solid #496872;background:#172d37}
.nist-orientation-guide h3{margin:0 0 7px;color:#e4efec;font:15px/1.25 Georgia,serif}
.nist-orientation-guide p{margin:5px 0;color:#bdcdd1;font-size:10px;line-height:1.5}
.nist-orientation-guide b{color:#e8d2a9}
.nist-claims{border-top:1px solid #38525d;padding-top:4px}
.nist-picked-member[hidden]{display:none}
.nist-picked-member{border:1px solid #746749;background:#302d23;padding:10px;margin:0 0 14px}
.nist-picked-member h3{font:16px/1.25 Georgia,serif;margin:0 0 5px}
.nist-picked-member p{font-size:11px;line-height:1.5;color:#e1d4b8;margin:0 0 5px}
.nist-picked-member a{color:#d5e2dc;font-size:10px}
.nist-claim{padding:11px 0;border-bottom:1px solid #29414d}
.nist-claim summary{cursor:pointer;list-style:none;padding-right:18px;position:relative}
.nist-claim summary::-webkit-details-marker{display:none}
.nist-claim summary:after{content:'+';position:absolute;right:0;top:3px;color:#9dbec6;font:16px ui-monospace,Menlo,monospace}
.nist-claim[open] summary:after{content:'−'}
.nist-claim-text{display:block;font-size:11px;line-height:1.5;color:#c3d3d8;margin:4px 0 0}
.nist-claim p{font-size:11px;line-height:1.55;margin:4px 0;color:#c3d3d8}
.nist-claim .nist-class{font:9px ui-monospace,Menlo,monospace;letter-spacing:.09em;color:#a8cbd0;text-transform:uppercase}
.nist-claim .nist-limit{color:#d3b69f}
.nist-claim a{display:inline-block;color:#b5d8e0;font-size:10px;margin-right:8px;margin-top:4px}
.nist-reset-view{width:100%;margin:14px 0 0;padding:9px;background:#1a3340;border:1px solid #527381;color:#d7e8ea;font-size:11px}
.nist-study-data{display:flex;flex-wrap:wrap;gap:7px 11px;margin:12px 0 0;font-size:10px;line-height:1.4}
.nist-study-data a{color:#a7cad3}
.nist-stage-note{position:absolute;left:28px;bottom:24px;z-index:2;max-width:min(520px,calc(100% - 80px));margin:0;padding:9px 12px;border:1px solid #587b86;background:#10242bdc;color:#d3e2e4;font:10px/1.45 ui-monospace,Menlo,monospace;pointer-events:none}
#nist-member-labels[hidden]{display:none}
#nist-member-labels{position:absolute;inset:0;z-index:2;pointer-events:none}
.nist-member-label{position:absolute;transform:translate(-50%,-50%);padding:3px 5px;border:1px solid #6e919d;background:#102630e8;color:#ebf2f2;font:10px/1.2 ui-monospace,Menlo,monospace;white-space:nowrap}
.nist-member-label[data-kind="column"]{border-color:#d5be8d;color:#f3dcac}
@media(max-width:800px){.study-switch{max-width:500px}.nist-controls{grid-column:1/-1}.nist-stage-note{left:18px;bottom:16px;font-size:9px}}

/* Observed camera measurements and NIST model marks retain separate labels. */
.nist-observed-view{border-top:1px solid #4c6975;margin:18px 0 0;padding-top:14px;min-width:0}
.nist-observed-view h3{margin:0 0 8px;color:#f2f0e9;font:18px/1.25 Georgia,serif}
.nist-observed-clock{margin:0 0 10px;padding-left:9px;border-left:2px solid #7baab7;color:#b7cbd1;font-size:10px;line-height:1.5}
.nist-observed-timeline,.nist-observed-stage-chart{min-width:0;margin:11px 0 14px;padding:10px 9px;background:#12252f;border:1px solid #385865}
.nist-observed-timeline figcaption,.nist-observed-stage-chart figcaption{margin:0 0 12px;color:#bfd0d4;font:10px/1.5 ui-monospace,Menlo,monospace}
.nist-observed-axis,.nist-observed-stage-ticks{color:#93aeb8;white-space:nowrap}
.nist-observed-axis{height:30px!important}
.nist-observed-axis span:nth-child(2){top:13px}
.nist-observed-time-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 7px;align-items:center;padding:9px 0;border-top:1px solid #2d4652;min-width:0}
.nist-observed-time-heading{grid-column:1/-1;color:#d7e5e7;font-size:10px;line-height:1.45}
.nist-observed-class{display:inline-block;padding:1px 4px;border:1px solid #74959c;color:#b9e0e5;font:9px/1.35 ui-monospace,Menlo,monospace;white-space:nowrap}
.nist-observed-time-row[data-evidence-class="nist_analysis"] .nist-observed-class{border-color:#a38762;color:#f2c88c}
.nist-observed-event-name{overflow-wrap:anywhere}
.nist-observed-track{grid-column:1;min-width:0}
.nist-observed-time-value{grid-column:2;color:#d9e7e8;font:10px/1.3 ui-monospace,Menlo,monospace;white-space:nowrap}
.nist-observed-event-detail{grid-column:1/-1;margin:0;color:#aebfc6;font-size:10px;line-height:1.45;overflow-wrap:anywhere}
.nist-observed-sources{grid-column:1/-1;display:block;color:#92aeb9;font-size:9px;line-height:1.5;overflow-wrap:anywhere}
.nist-observed-sources a{color:#b8dce3}
.nist-observed-limit,.nist-observed-publication-rule{margin:10px 0 0;padding:8px 9px;background:#273139;border-left:2px solid #c09d70;color:#d2c5b3;font-size:10px;line-height:1.5}
.nist-observed-trajectory{margin:17px 0 0;min-width:0}
.nist-observed-stage-bands{min-width:0}
.nist-observed-stage-band{overflow:hidden;white-space:nowrap}
.nist-observed-stage-list{margin:12px 0;padding-left:19px;color:#c2d1d5;font-size:10px;line-height:1.55}
.nist-observed-stage-list li+li{margin-top:7px}
.nist-observed-stage-list strong{color:#e1ecec}
.nist-observed-derivation{color:#97acb5}
.nist-report-figures{display:grid;gap:11px;margin:14px 0}
.nist-report-figure{margin:0;border:1px solid #496771;background:#edf2f2;padding:5px}
.nist-report-figure>a{display:block}
.nist-report-figure img{display:block;width:100%;height:auto}
.nist-report-figure figcaption{padding:5px 3px 2px;color:#233741;font-size:9px;line-height:1.45}
.nist-report-figure figcaption a{color:#285b70}
.nist-observed-method{display:grid;grid-template-columns:minmax(70px,1fr) minmax(0,1.6fr);gap:7px 9px;margin:12px 0;padding:10px 0;border-block:1px solid #385560;font-size:10px;line-height:1.45}
.nist-observed-method dt{color:#9eb9c3}
.nist-observed-method dd{margin:0;color:#d1dfe1;overflow-wrap:anywhere}
.nist-observed-derived-number{margin:10px 0;color:#cbd9dc;font-size:10px;line-height:1.5}

/* Match the tower chapter presentation: 3D stage, source card and one transport. */
body[data-wtc7-study="true"] main{grid-template-rows:minmax(0,1fr) auto}
body[data-wtc7-study="true"] #building-controls{min-height:0}
body[data-wtc7-study="true"] #building-controls>:is(.eyebrow,h1,.introduction){display:none}
body[data-wtc7-study="true"] .study-switch{margin:0 0 18px}
.nist-chapter-meta{display:flex;justify-content:space-between;gap:12px;margin:2px 0 18px;color:#a5c6ce;font:10px/1.4 ui-monospace,Menlo,monospace;letter-spacing:.08em}
.nist-chapter-meta span:last-child{text-align:right;color:#8da8b1}
.nist-view-mode{display:grid;grid-template-columns:1fr 1fr;gap:4px;margin:0 0 10px}
.nist-view-mode button{min-height:34px;padding:7px 8px;background:#162a35;border:1px solid #486570;color:#b8cbd0;font-size:11px;line-height:1.3}
.nist-view-mode button[aria-pressed="true"]{background:#a6cbd0;border-color:#a6cbd0;color:#0d1d25}
.nist-scene-status{margin:0 0 14px}
#nist-state-title{font:400 29px/1.14 "Iowan Old Style",Baskerville,Georgia,serif;letter-spacing:-.02em;margin:0 0 12px}
#nist-state-description{font-size:14px;line-height:1.65;margin:0 0 18px}
.nist-time-note{margin:0 0 18px}
.nist-evidence-figure{margin:0 0 18px;padding:11px;background:#10212b;border:1px solid #3c5661}
.nist-evidence-figure[hidden]{display:none}
.nist-evidence-figure>p{margin:0 0 9px;color:#afd0d5;font:10px/1.4 ui-monospace,Menlo,monospace;letter-spacing:.11em}
#nist-evidence-link{display:block;position:relative;border:1px solid #4a626b;background:#e6ecec;text-decoration:none;overflow:hidden}
#nist-evidence-image{display:block;width:100%;height:190px;object-fit:contain}
#nist-evidence-link span{position:absolute;right:5px;bottom:5px;padding:4px 7px;background:#13232fe8;color:#d7edf0;font-size:10px}
#nist-evidence-caption{padding-top:8px;color:#b8c9ce;font-size:11px;line-height:1.45}
.nist-stage-note{bottom:20px}
#nist-transport{grid-column:1/-1;grid-row:2;min-width:0;background:#0c161e;border-top:1px solid #344a56;padding:10px 26px 8px;z-index:5}
.nist-transport-main{display:flex;align-items:center;gap:17px;min-width:0;min-height:39px}
.nist-transport-buttons{display:flex;gap:6px;flex:none}
.nist-transport-buttons button{height:35px;min-width:37px;padding:0 10px;font-size:14px;background:#13242f}
.nist-transport-buttons #nist-play-toggle{min-width:132px;color:#bbdce0;text-align:center}
.nist-progress-wrap{display:flex;flex-direction:column;gap:2px;flex:1;min-width:95px}
#nist-beat-label{font-size:11px;line-height:1.3;color:#acbec5;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#nist-play-progress{display:block;width:100%;height:16px;margin:0;accent-color:#a7d3dc;cursor:pointer}
#nist-play-readout{min-width:34px;color:#dae7e8;font:11px ui-monospace,Menlo,monospace;text-align:right}
.nist-pace-note{flex:none;color:#8fa7b0;font-size:10px;white-space:nowrap}
#nist-chapters{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:10px;padding-top:8px}
#nist-chapters button{text-align:left;min-width:0;min-height:30px;border:0;border-top:2px solid #334a55;padding:7px 0 2px;background:none;color:#92aab3;font-size:11px;line-height:1.25;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
#nist-chapters button:hover{color:#e2ecec;border-color:#82abb5}
#nist-chapters button[aria-current="step"],#nist-chapters button[aria-pressed="true"]{border-color:#a7d3dc;color:#e3eeee}
#nist-chapters button span{color:#7c9aa5;font:10px ui-monospace,Menlo,monospace;margin-right:6px}
@media(max-width:1100px){#nist-transport{padding-inline:18px}.nist-transport-main{gap:10px}.nist-pace-note{display:none}#nist-chapters{gap:6px}#nist-chapters button{font-size:10px}}
@media(max-width:800px){
  body[data-wtc7-study="true"] main{display:flex;flex-direction:column;height:auto;min-height:calc(100dvh - 60px);padding-bottom:112px}
  body[data-wtc7-study="true"] .stage{order:0;height:52dvh;min-height:320px}
  body[data-wtc7-study="true"] #building-controls{order:1;display:block;padding:22px 22px 30px}
  body[data-wtc7-study="true"] #building-controls>*{grid-column:auto}
  #nist-transport{position:fixed;inset:auto 0 0;min-height:104px;padding:8px 14px 7px}
  .nist-transport-main{gap:9px;min-height:36px}
  .nist-transport-buttons button{height:32px;min-width:32px;padding:0 7px}
  .nist-transport-buttons #nist-play-toggle{min-width:42px}
  #nist-play-toggle span{display:none}
  #nist-chapters{display:flex;gap:11px;overflow-x:auto;scrollbar-width:none;padding-top:9px}
  #nist-chapters button{flex:0 0 88px;min-height:39px;font-size:10px}
  .nist-stage-note{bottom:14px;left:18px;right:18px;max-width:none}
}
@media(max-width:430px){.nist-transport-main{gap:7px}#nist-play-readout{min-width:30px;font-size:10px}.nist-view-mode{max-width:500px}}
@media(max-width:430px){body[data-wtc7-study="true"] .nist-member-label[data-kind="beam"]{display:none}}

/* The film has a stable stage and a separate, optional evidence drawer. */
body[data-wtc7-study="true"] main{grid-template-columns:minmax(0,1fr);background:#091219}
body[data-wtc7-study="true"] #building-controls{display:none}
body[data-wtc7-study="true"][data-wtc7-evidence="true"] main{grid-template-columns:340px minmax(0,1fr)}
body[data-wtc7-study="true"][data-wtc7-evidence="true"] #building-controls{display:block;background:#10212b}
body[data-wtc7-study="true"] .stage{grid-column:-2/-1;background:radial-gradient(ellipse at 59% 40%,#203843 0%,#111f28 52%,#0b151d 100%)}
body[data-wtc7-study="true"] .stage #viewport{top:68px;bottom:224px}
body[data-wtc7-study="true"] .stage-heading{top:70px;left:30px;right:30px;pointer-events:none}
body[data-wtc7-study="true"] .stage-heading .stage-tag{max-width:45%;text-align:right;font-size:9px;color:#b3c6cb}
body[data-wtc7-study="true"] .stage .viewport-actions{top:111px}
body[data-wtc7-study="true"] .north-indicator{bottom:252px;left:30px}
#cinematic-toolbar[hidden],#cinematic-caption[hidden]{display:none}
#cinematic-toolbar{position:absolute;top:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 30px;z-index:4;border-bottom:1px solid #7b9ca41c}
#cinematic-toolbar>div{display:flex;gap:16px;align-items:center}
#cinematic-toolbar>div:first-child{color:#a2b7c0;font:10px ui-monospace,Menlo,monospace;letter-spacing:.14em}
.cinematic-building{font:23px/1 Georgia,serif;color:#e2e8e8;letter-spacing:-.03em;padding-right:15px;border-right:1px solid #59717a}
#cinematic-toolbar button{font-size:11px;color:#bacdd3;background:#182c36;padding:7px 12px;border:1px solid #405c68;border-radius:3px}
#cinematic-toolbar button[aria-expanded="true"]{background:#a5cbd2;color:#10212a}
#cinematic-caption{position:absolute;bottom:0;left:0;right:0;min-height:218px;padding:19px max(30px,calc((100% - 980px)/2)) 21px;background:linear-gradient(180deg,#0a141c00,#0a141ceb 28%);border-top:1px solid #718b9826}
.cinematic-caption-meta{display:flex;justify-content:space-between;gap:14px;color:#e5b77c;font:10px/1.4 ui-monospace,Menlo,monospace;letter-spacing:.12em}
#cinematic-step{color:#809da9;letter-spacing:.02em}
#cinematic-title{font:400 clamp(27px,2.6vw,38px)/1.13 "Iowan Old Style",Baskerville,Georgia,serif;letter-spacing:-.025em;color:#f0eee6;margin:9px 0 8px}
#cinematic-copy{font-size:16px;line-height:1.6;color:#c3d0d5;max-width:790px;margin:0;text-wrap:pretty}
.cinematic-caption-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:11px}
#cinematic-visual-label{font:9px/1.4 ui-monospace,Menlo,monospace;color:#8da7b2;letter-spacing:.035em}
#cinematic-replay{padding:4px 9px;border-color:#6d8b96;color:#c8e2e4;font-size:10px;background:#142832}
body[data-wtc7-study="true"] .nist-stage-note{left:auto;right:30px;bottom:239px;max-width:440px;border:0;border-left:2px solid #bc945f;background:#0b1823bd;font:10px/1.45 ui-monospace,Menlo,monospace;padding:7px 10px;color:#a9bec7}
#cinematic-labels{position:absolute;inset:0;z-index:2;pointer-events:none}
.cinematic-label{position:absolute;transform:translate(-50%,-50%);font:10px/1.35 ui-monospace,Menlo,monospace;color:#f3c793;background:#10222de8;border-left:2px solid #d49a58;padding:4px 7px;white-space:nowrap;box-shadow:0 3px 15px #06101944}
.cinematic-label[data-kind="reference"]{color:#b7d7de;border-color:#88b5c5}
#nist-chapters{grid-template-columns:repeat(6,minmax(0,1fr))}
#cinematic-source-context{margin-top:20px;border-top:1px solid #49636d;padding-top:12px}
#cinematic-source-context details{padding:11px 0;border-top:1px solid #34505d}
#cinematic-source-context summary{font-size:13px;color:#dce6e7;cursor:pointer}
#cinematic-source-context p{font-size:12px;line-height:1.65;color:#b5c8ce}
#cinematic-source-context a{font-size:10px;color:#a9d0da}
@media(max-width:1100px){#cinematic-caption{padding-inline:28px}#cinematic-copy{font-size:15px}.cinematic-caption-meta{font-size:9px}}
@media(max-width:800px){
 body[data-wtc7-study="true"] main{height:calc(100dvh - 60px);min-height:640px;padding-bottom:0;display:flex}
 body[data-wtc7-study="true"] .stage{flex:1;height:auto;min-height:535px;order:0}
 body[data-wtc7-study="true"] #nist-transport{position:relative;inset:auto;order:2;flex:none;min-height:96px;padding:8px 14px}
 body[data-wtc7-study="true"] .stage #viewport{top:98px;bottom:245px}
 body[data-wtc7-study="true"] .stage-heading{top:98px;left:16px;right:16px}
 body[data-wtc7-study="true"] .stage-heading .stage-tag{display:none}
 #cinematic-toolbar{padding:13px 16px;align-items:flex-start}
 #cinematic-toolbar>div:first-child{flex-direction:column;gap:8px;align-items:flex-start;font-size:8px}
 #cinematic-toolbar>div:last-child{gap:5px;flex-direction:column;align-items:stretch}
 .cinematic-building{border:0;font-size:24px}
 #cinematic-toolbar button{font-size:10px;padding:6px 9px}
 #cinematic-caption{min-height:227px;padding:17px 20px 16px}
 #cinematic-title{font-size:28px;margin:8px 0}
 #cinematic-copy{font-size:14px;line-height:1.55}
 #cinematic-visual-label{font-size:8px;max-width:65%}
 .cinematic-caption-meta{font-size:8px;letter-spacing:.06em}
 body[data-wtc7-study="true"] .nist-stage-note{bottom:251px;left:52px;right:16px;max-width:none;font-size:8px;padding:5px 8px;line-height:1.4}
 body[data-wtc7-study="true"] .north-indicator{bottom:265px;left:19px}
 body[data-wtc7-study="true"] .stage .viewport-actions{top:115px;right:10px}
 .cinematic-label{font-size:8px;padding:3px 4px}
 body[data-wtc7-study="true"][data-wtc7-evidence="true"] #building-controls{order:1;max-height:65dvh;overflow:auto;flex:none;width:100%;border-top:1px solid #52717d}
 body[data-wtc7-study="true"][data-wtc7-evidence="true"] main{height:auto}
 body[data-wtc7-study="true"][data-wtc7-evidence="true"] .stage{flex:none;height:calc(100dvh - 160px)}
 #cinematic-replay{max-width:135px;font-size:9px;line-height:1.3}
}
body[data-wtc7-study="true"] main:fullscreen{height:100dvh;min-height:0;width:100vw}

#fire-timeline[hidden]{display:none}
#fire-timeline{position:absolute;z-index:3;right:32px;top:107px;width:274px;padding:12px 14px;background:#101e28ee;border:1px solid #59606a;border-radius:3px;box-shadow:0 8px 25px #040b1222}
#fire-timeline>div:first-child{display:flex;justify-content:space-between;align-items:center;gap:10px}
#fire-timeline>div:first-child>span{font:8px/1.5 ui-monospace,Menlo,monospace;letter-spacing:.08em;color:#c49e78;max-width:125px}
#fire-clock{font:20px/1.2 Georgia,serif;color:#ffd3a1;white-space:nowrap}
#fire-timeline label{display:block;font-size:10px;color:#a8bdc6;margin-top:10px}
#fire-time{width:100%;display:block;accent-color:#ec9f58;cursor:pointer;margin:7px 0}
.fire-ticks{display:flex;justify-content:space-between;font:8px ui-monospace,Menlo,monospace;color:#a3b5bf}
#fire-current-note{color:#9bb1bd;font-size:10px;line-height:1.4;margin:11px 0 0}
.cinematic-label{max-width:calc(100% - 20px);overflow:hidden;text-overflow:ellipsis}
body[data-wtc7-study="true"] .stage[data-fire-scene="true"] .viewport-actions{top:285px}
@media(max-width:1100px){#fire-timeline{right:20px;width:230px;top:99px;padding:9px 11px}#fire-clock{font-size:18px}#fire-current-note{font-size:9px}}
@media(max-width:800px){
 #fire-timeline{top:120px;right:14px;left:14px;width:auto;padding:8px 12px}
 #fire-timeline>div:first-child>span{max-width:none;font-size:7px}
 #fire-clock{font-size:18px}
 #fire-timeline label,#fire-current-note{display:none}
 #fire-time{margin:5px 0;height:13px}
 .fire-ticks{font-size:7px}
 body[data-wtc7-study="true"] .stage[data-fire-scene="true"] #viewport{top:205px}
 body[data-wtc7-study="true"] .stage[data-fire-scene="true"] .viewport-actions{top:210px}
}
@media(min-width:801px){body[data-wtc7-study="true"] .stage[data-fire-scene="true"] .viewport-actions{left:24px;right:auto;top:108px}}
#nist-chapters{grid-template-columns:repeat(7,minmax(0,1fr))}
#collapse-timing[hidden]{display:none}
#collapse-timing{position:absolute;z-index:3;right:30px;top:105px;width:266px;padding:13px 16px;background:#0e1d27ed;border:1px solid #425c66;border-radius:3px}
#collapse-timing>p{font:9px ui-monospace,Menlo,monospace;color:#98bcc5;letter-spacing:.1em;margin:0 0 11px}
#collapse-timing ol{list-style:none;margin:0;padding:0;display:grid;gap:10px}
#collapse-timing li{display:grid;grid-template-columns:52px 1fr;gap:7px;align-items:center;color:#839ba6;position:relative;padding-left:10px;border-left:2px solid #35515e}
#collapse-timing li[data-active=true]{color:#f3d4a6;border-color:#e6a365}
#collapse-timing b{font:18px/1.3 Georgia,serif;font-weight:400}
#collapse-timing span{font-size:10px;line-height:1.4}
#collapse-timing small{font:8px/1.5 ui-monospace,Menlo,monospace;color:#819da8;display:block;margin-top:12px}
#collapse-timing a{font-size:9px;color:#a8c7d0}
.nist-member-label[data-kind=teaching]{border-color:#a77c47;color:#f3d6a7;font-size:10px}
@media(min-width:801px){body[data-wtc7-study="true"] .stage[data-collapse-scene=true] .viewport-actions{left:24px;right:auto;top:108px}}
@media(max-width:800px){
 #collapse-timing{top:117px;left:14px;right:14px;width:auto;padding:9px 11px}
 #collapse-timing>p{font-size:7px;margin-bottom:7px}
 #collapse-timing ol{grid-template-columns:repeat(3,1fr);gap:9px}
 #collapse-timing li{display:block;padding-left:6px}
 #collapse-timing b{display:block;font-size:15px}
 #collapse-timing span{display:block;font-size:8px;line-height:1.3}
 #collapse-timing small{font-size:7px;margin-top:7px;display:inline-block}
 #collapse-timing a{font-size:7px;float:right;margin-top:7px}
 body[data-wtc7-study="true"] .stage[data-collapse-scene=true] #viewport{top:232px}
 body[data-wtc7-study="true"] .stage[data-collapse-scene=true] .viewport-actions{top:238px;right:10px;left:auto}
 .nist-member-label[data-kind=teaching]{font-size:8px}
}
@media(min-width:801px){body[data-wtc7-study="true"] .stage[data-collapse-scene=true] #viewport{right:305px}}

/* Keep explanatory text outside the moving structure. */
body[data-wtc7-study="true"] .nist-stage-note,
body[data-wtc7-study="true"] .stage-heading .stage-tag{display:none}
body[data-wtc7-study="true"] .stage #viewport{bottom:calc(var(--caption-height, 230px) + 6px)}
body[data-wtc7-study="true"] .north-indicator{bottom:calc(var(--caption-height, 230px) + 20px)}
#cinematic-caption{padding-top:16px;padding-bottom:17px}
.cinematic-caption-foot{align-items:flex-end;gap:18px;margin-top:12px}
.cinematic-caption-foot>div:first-child{min-width:0}
#cinematic-key{display:flex;flex-wrap:wrap;gap:6px 20px;margin-bottom:8px;color:#cbd8dc;font-size:11px;line-height:1.4}
#cinematic-key[hidden],#cinematic-key:empty{display:none}
#cinematic-key>span{display:inline-flex;align-items:center;gap:7px}
#cinematic-key>span::before{content:"";width:17px;height:3px;flex:none;background:#97dce7}
#cinematic-key>span[data-tone=failing]::before{background:#f2b16b}
#cinematic-visual-label{display:block;max-width:none}
.cinematic-replay-actions{display:flex;gap:7px;flex:none}
#cinematic-replay-step,#cinematic-replay{padding:6px 9px;border:1px solid #536c77;border-radius:3px;color:#c8e2e4;font-size:10px;background:#142832;white-space:nowrap;cursor:pointer}
#cinematic-replay-step:hover,#cinematic-replay:hover{background:#213b47}
.cinematic-label{background:#10222dbb;box-shadow:none;padding:2px 5px}
@media(max-width:800px){
 #cinematic-title{font-size:26px}
 #cinematic-copy{font-size:13px;line-height:1.5}
 #cinematic-key{gap:4px 12px;font-size:9px;margin-bottom:7px}
 .cinematic-caption-foot{gap:10px}
 .cinematic-replay-actions{flex-direction:column;align-items:flex-end}
 #cinematic-replay-step,#cinematic-replay{font-size:9px;padding:6px 7px}
 #collapse-timing{top:117px;padding:8px 11px}
 #collapse-timing>p,#collapse-timing small,#collapse-timing>a{display:none}
 #collapse-timing b{font-size:15px;line-height:1.15;margin-bottom:3px}
 #collapse-timing span{font-size:8px;line-height:1.2}
 body[data-wtc7-study="true"] .stage[data-collapse-scene=true] #viewport{top:179px}
 body[data-wtc7-study="true"] .stage[data-collapse-scene=true] .viewport-actions{top:184px}
}

/* Keep the shared construction entrance reachable beside the Day chapters. */
@media(max-width:600px){.masthead .wordmark>span:last-child{display:none}.masthead nav{align-items:center}.masthead nav a{padding-inline:7px}}