@font-face{font-family:Fraunces;src:url('assets/fonts/fraunces.ttf') format('truetype');font-weight:100 900;font-display:swap}
:root{--panel-shadow:4px 4px 0 var(--ink);font:16px/1.45 Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}button,input,textarea,select{font:inherit;color:inherit}button{min-height:44px;padding:9px 12px;border:1px solid var(--line);border-radius:2px;background:var(--surface);font-size:13px;font-weight:600;cursor:pointer}button:hover{background:var(--hover);border-color:var(--ink)}button:disabled{opacity:.45;cursor:default}.primary{background:var(--ink);color:var(--surface);border:2px solid var(--ink);box-shadow:2px 2px 0 var(--ink)}.primary:hover{background:var(--primary-hover)}.accent,[aria-selected=true]{background:var(--accent);border:2px solid var(--ink);box-shadow:2px 2px 0 var(--ink)}button:active{box-shadow:none}input,textarea{background:var(--surface);border:1px solid var(--field-border);border-radius:0;min-height:44px;padding:10px 12px;min-width:0;caret-color:var(--ink);font-variant-numeric:tabular-nums}textarea{resize:vertical;width:100%}::selection{background:var(--selected);color:var(--ink)}:focus{outline:none}:focus-visible,html[data-focus-input=keyboard] :focus{outline:3px solid var(--focus);outline-offset:3px}input:focus,textarea:focus,html[data-focus-input=keyboard] input:focus,html[data-focus-input=keyboard] textarea:focus{outline:none;box-shadow:none;border-color:var(--field-border)}[hidden]{display:none!important}*{scrollbar-width:thin;scrollbar-color:var(--line) var(--paper)}.skip-link{position:fixed;left:12px;top:-80px;background:var(--surface);z-index:20;padding:12px;color:var(--ink)}.skip-link:focus{top:8px}
h1,h2,h3,p{margin-top:0}h2{font-size:20px}h3{font-size:15px}a{color:inherit;text-underline-offset:3px}.app-header{min-height:64px;margin:0 24px;padding:8px 0;display:flex;align-items:center;gap:20px;border-bottom:1px solid var(--ink)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-size:15px;white-space:nowrap}.brand svg{width:42px;height:32px}.brand-mark{display:flex;align-items:center;flex:none}.brand-mark svg{width:38px;height:auto}.landing-course{display:none;margin-left:auto;font-size:13px;letter-spacing:.2em;white-space:nowrap}.landing-active .brand{font-size:17px;font-weight:600;letter-spacing:-.025em}.landing-active .header-actions{display:none}.landing-active .landing-course{display:block}.header-actions{margin-left:auto;display:flex;gap:12px;align-items:center}.file-action{position:relative}.file-formats{position:absolute;right:0;top:calc(100% + 6px);width:230px;padding:6px;border:2px solid var(--ink);background:var(--surface);box-shadow:var(--panel-shadow);z-index:5;max-height:65svh;overflow:auto}.file-formats button{display:block;width:100%;text-align:left;border:0}.file-formats button span{display:block;font-size:12px;font-weight:400;color:var(--muted)}.guide-entry{border:1px solid var(--ink);background:transparent}
#landing-page{width:min(100%,calc((100svh - 64px)*2));max-width:1480px;margin:auto;display:grid;grid-template-columns:minmax(0,.88fr) minmax(0,1.12fr);gap:clamp(12px,2vw,32px);align-items:center;padding:clamp(20px,3vh,36px) clamp(24px,3vw,48px);min-height:calc(100svh - 64px)}.landing-lab{display:flex;gap:20px;align-items:center;margin-bottom:clamp(20px,3vh,32px)}.landing-lab>span,.lab-number{display:grid;place-items:center;background:var(--accent);border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink);width:54px;height:54px;font-size:26px;font-weight:700;flex:none}.landing-lab strong{flex:1;align-self:stretch;display:flex;align-items:center;border-bottom:1px solid var(--ink);padding:12px 0;font-size:clamp(18px,1.9vw,28px);line-height:1.2}#landing-title{font-family:Fraunces,Georgia,serif;font-size:clamp(42px,min(4.8vw,8vh),72px);line-height:.99;font-weight:750;font-variation-settings:"opsz" 72,"SOFT" 0,"WONK" 1;letter-spacing:-.035em;margin-bottom:20px}.landing-intro{max-width:52ch;font-size:clamp(16px,min(1.25vw,2.3vh),18px);line-height:1.45}.landing-intro p{margin-bottom:20px}.scenario-phrase{display:inline;cursor:pointer;border:0;padding:0;min-height:0;font:inherit;background:transparent;text-align:left;box-decoration-break:clone;-webkit-box-decoration-break:clone;transition:background-color .6s}.scenario-phrase[aria-pressed=true]{background:var(--selected)}.scenario-phrase:hover{background:var(--selection-hover)}.landing-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:20px}.landing-links button{display:flex;align-items:center;gap:12px;background:transparent;border:0;padding:8px 0;font-size:clamp(13px,1.15vw,16px);text-decoration:none;text-align:left}.landing-links button+button{border-left:1px solid var(--line);padding-left:22px}.landing-links button:hover{text-decoration:underline;text-underline-offset:4px}.landing-links svg{width:28px;height:28px;flex:none}.landing-carousel{position:relative;min-width:0;padding-bottom:52px}#landing-page .landing-carousel{padding-bottom:0}.carousel-control{position:absolute;inset-inline-end:0;bottom:0}.landing-scenes{position:relative;aspect-ratio:1;width:100%;max-height:max(280px,calc(100svh - 180px))}.landing-art{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;opacity:0;transition:opacity .6s;pointer-events:none}.landing-art.is-current{opacity:1}.landing-enter{position:relative;display:grid;align-items:center;grid-template-columns:minmax(0,1fr) 132px;isolation:isolate;width:100%;min-height:120px;padding:16px 0 16px 24px;text-align:left;background:var(--entry);border:1px solid var(--ink);box-shadow:3px 3px 0 var(--ink);margin-top:24px}.landing-enter:hover{background:var(--entry-hover)}.envelope-label{grid-column:1;min-width:0;z-index:2}.envelope-label strong{font-family:Fraunces,Georgia,serif;font-size:clamp(32px,2.8vw,40px);line-height:1.12}.envelope-lock{position:absolute;right:0;top:50%;transform:translateY(-50%);width:132px;height:124px;overflow:visible;pointer-events:none;z-index:3}.stud-shadow{fill:var(--ink);opacity:.1}.stud{fill:var(--stud);stroke:var(--stud-border);stroke-width:.8}.stud-pin{fill:var(--ink);r:2.2px}.envelope-lock [data-cord]{stroke-linecap:round;stroke-linejoin:round;fill:none}.cord-shadow{stroke:var(--ink);stroke-width:2;opacity:.12;transform:translate(.6px,1px)}.cord-ink{stroke:var(--cord);stroke-width:1.7}
.lab-banner{display:flex;align-items:center;gap:20px;margin:24px 24px 16px;min-height:64px;border-bottom:2px solid var(--ink)}.lab-number{width:44px;height:44px;font-size:22px}.lab-banner h1{font-size:24px;margin:0}.main-tabs{display:flex;align-self:flex-end;gap:6px;margin:0 0 -2px auto;padding-top:4px;min-width:0}.main-tabs button{background:var(--paper);color:var(--muted);border:2px solid var(--ink);border-radius:2px 2px 0 0;padding:10px 20px;font-size:14px;box-shadow:none}.main-tabs [aria-selected=true]{background:var(--accent);color:var(--ink);border-bottom-color:var(--accent);box-shadow:none}.main-tabs button:focus-visible{outline-offset:-5px}.workspace{padding:0 24px 32px;min-width:0}.workbench{display:grid;grid-template-columns:224px minmax(0,1fr);gap:16px;align-items:start}.panel{border:2px solid var(--ink);background:var(--surface);min-width:0}.sheet{box-shadow:var(--panel-shadow)}.panel-title{font-size:15px;background:var(--accent);padding:12px 16px;border-bottom:2px solid var(--ink);margin:0}.shelf{padding:8px}.beam-choice{width:100%;display:flex;gap:12px;align-items:center;text-align:left;background:transparent;border:1px solid transparent;margin-bottom:4px}.beam-choice[aria-pressed=true]{background:var(--selected);border-color:var(--ink);box-shadow:inset 3px 0 0 var(--ink)}.beam-choice svg{width:44px;height:44px;flex:none}.beam-choice small{display:block;font-weight:400;color:var(--muted);font-size:12px}.beam-choice[aria-pressed=true] small{color:var(--ink)}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:12px 16px;border-bottom:2px solid var(--ink)}.toolbar h2{font-size:18px;margin:0}.toolbar-actions{display:flex;gap:8px;flex-wrap:wrap}.sheet-body{padding:20px}.section-heading{margin:28px 0 12px;font-size:16px}.section-heading:first-child{margin-top:0}.measurement-top{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:24px}.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.field{display:flex;flex-direction:column;gap:6px;font-size:13px}.field input{width:100%}.section-diagram{width:100%;max-height:170px}.quiet{font-size:13px;color:var(--muted)}.weights{padding:16px}.weights .field{margin:0 0 10px}.table-scroll{max-width:100%;overflow:auto;overscroll-behavior:contain}table{border-collapse:collapse;width:100%;text-align:left;font-variant-numeric:tabular-nums;font-size:13px}caption{text-align:left;font-weight:700;font-size:16px;margin-bottom:12px}th{font-weight:600;padding:10px 12px;background:var(--paper);border-bottom:1px solid var(--ink);vertical-align:bottom}td{padding:0;border-bottom:1px solid var(--rule)}td:first-child:not(:has(input)){padding:12px}td input{width:100%;min-width:105px;border:0;background:transparent;font-size:14px}td input:hover{background:var(--selected)}td:focus-within{background:var(--selected)}.read-cell{padding:12px!important;min-width:110px}.analysis-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.62fr);gap:24px;align-items:start}.analysis-entries{min-width:0}.plot{min-width:0;border-top:1px solid var(--ink);margin-top:32px;padding-top:24px}.plot-drawing{width:100%;max-width:1100px;overflow:auto}.plot-drawing>svg{display:block;max-width:none;height:auto}.plot-empty{padding:32px 24px;text-align:center;color:var(--muted);font-size:14px}.comparison{margin-top:24px}.guide-heading{position:sticky;top:-24px;background:var(--paper);display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;border-bottom:1px solid var(--ink);z-index:2}.guide-heading h1{font:700 32px/1.15 Fraunces,Georgia,serif;margin:0}.guide-content{max-width:100%;padding-top:24px}.guide-columns{display:grid;grid-template-columns:1fr 1fr;gap:32px}.guide-content p,.guide-content li{max-width:70ch}.guide-content li{margin-bottom:8px}.guide-scenario{display:grid;grid-template-columns:1fr 280px;gap:24px;align-items:center;margin-bottom:28px}.guide-scenario .landing-scenes{max-height:280px}.formula{font-size:18px;font-family:Georgia,serif}.guide-content details{margin:16px 0}.guide-content summary{cursor:pointer;font-weight:700}.empty-example{max-width:760px;margin:24px auto}.empty-example .sheet-body{padding:28px}
dialog{max-height:calc(100svh - 40px);overflow:auto;color:var(--ink)}#guide-dialog{width:min(1060px,calc(100vw - 40px));padding:24px;background:var(--paper);border:2px solid var(--ink);border-radius:2px;box-shadow:5px 5px 0 var(--ink)}#guide-dialog::backdrop{background:var(--backdrop)}
/* Original Humanitarian Relief Reset dialog is the visual authority. */
#reset-dialog { width: min(380px, calc(100vw - 40px)); padding: 24px; background: var(--paper); border: 2px solid var(--ink); border-radius: 2px; box-shadow: 5px 5px 0 var(--ink); }
#reset-dialog::backdrop { background: var(--backdrop); }
#reset-dialog h2 { margin: 0 0 12px; font-size: 20px; }
#reset-dialog p { margin: 0 0 24px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }

#conflict-actions,#saved-copies{border-top:1px solid var(--line);margin-top:6px;padding-top:6px}.file-formats summary{cursor:pointer;min-height:44px;padding:12px;font-size:13px;font-weight:600}.file-formats button{overflow-wrap:anywhere}
.entry-table td{border-bottom-color:var(--field-border);border-inline-end:1px solid var(--field-border)}.entry-table tbody th,.entry-table thead th:first-child{position:sticky;left:0;z-index:1;background:var(--paper);border-inline-end:1px solid var(--field-border)}
.measurement-reference{min-width:0;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.measurement-reference summary{cursor:pointer;min-height:44px;padding:10px 0;font-size:16px;font-weight:700}.reference-body{padding:4px 0 16px}.reference-geometry{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:16px 0}.reference-geometry dt{font-size:13px;color:var(--muted)}.reference-geometry dd{font-size:16px;margin:4px 0 0;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.measurement-reference .read-cell{min-width:0;overflow-wrap:anywhere;font-size:14px}.measurement-reference button{margin-top:16px}
.plot-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:8px}.plot-heading h3{font-size:18px;margin:0}.plot-legend{list-style:none;padding:0;margin:16px 0 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));gap:16px 24px}.plot-legend li{display:flex;align-items:flex-start;gap:8px;font-size:14px;min-width:0}.plot-legend svg{flex:none;width:20px;height:20px}.plot-equation{display:block;font-variant-numeric:tabular-nums;margin-top:4px;overflow-wrap:anywhere}.load-note{margin-top:16px}
@media(min-width:701px){.supply-panel{position:sticky;top:16px;max-height:calc(100svh - 32px);overflow:auto}}
@media(max-width:1100px){.analysis-layout{grid-template-columns:1fr}.measurement-reference{grid-row:1}.measurement-top{grid-template-columns:minmax(0,1fr) 180px}.lab-banner{flex-wrap:wrap}.main-tabs{margin-left:0}.guide-scenario{grid-template-columns:1fr 240px}}
@media(max-width:1000px) and (min-height:700px){#landing-page{width:100%;grid-template-columns:1fr;max-width:720px;gap:24px}.landing-carousel{max-width:520px;margin:auto;width:100%}}
@media(max-width:760px){.landing-active .landing-course{font-size:10px;letter-spacing:.12em}#landing-page{width:100%;grid-template-columns:1fr;padding:32px 24px;gap:0}.landing-copy{max-width:580px;margin-inline:auto}#landing-title{font-size:clamp(44px,8.5vw,64px)}.landing-carousel{width:100%;max-width:560px;margin:12px auto 0}.landing-scenes{max-height:none}.landing-links{gap:12px}.landing-links button+button{padding-left:14px}.landing-links svg{width:23px}}
@media(max-width:700px){.app-header{margin:0 16px;gap:12px;flex-wrap:wrap}.landing-active .landing-course{display:block;font-size:10px;letter-spacing:.12em}.header-actions{gap:8px}.brand strong{max-width:105px;white-space:normal;line-height:1.15}#landing-page{width:100%;grid-template-columns:1fr;padding:24px 20px 32px;gap:24px;min-height:0}#landing-title{font-size:clamp(40px,10.5vw,56px);line-height:1.04}.landing-carousel{width:100%;max-width:460px;margin:auto}.landing-scenes{max-height:none}.landing-intro{font-size:16px;line-height:1.5}.landing-lab{margin-bottom:24px}.landing-lab strong{font-size:20px}.lab-banner{margin:20px 16px 0;gap:12px}.lab-banner h1{font-size:21px}.main-tabs{width:100%;gap:4px}.main-tabs button{flex:1;padding:8px;font-size:13px}.measurement-reference .read-cell{font-size:14px}.workspace{padding:0 16px 24px}.workbench{grid-template-columns:1fr}.shelf{display:flex;overflow:auto;gap:4px}.beam-choice{min-width:150px;margin:0}.weights{display:grid;grid-template-columns:repeat(5,minmax(90px,1fr));gap:8px;overflow:auto}.weights .field{margin:0}.weights input{width:100%}.measurement-top{grid-template-columns:1fr}.section-diagram{max-height:140px}.sheet-body{padding:16px}.toolbar{padding:12px}.guide-columns,.guide-scenario{grid-template-columns:1fr}.guide-scenario .landing-carousel{max-width:280px}.guide-heading h1{font-size:26px}input,textarea,td input{font-size:16px}.landing-links{display:flex;gap:12px}.landing-links button+button{border:0;padding-left:0}.landing-links svg{width:23px;height:23px}.landing-links button{text-align:left}.landing-enter{min-height:88px;grid-template-columns:minmax(0,1fr) 76px;padding:16px}.envelope-label strong{font-size:28px}.envelope-lock{width:76px;height:88px}.landing-lab>span{width:44px;height:44px;font-size:22px}}
@media(max-width:380px){.landing-active .landing-course{display:none}.app-header{margin:0 12px}.brand{gap:6px;font-size:13px}.brand svg{width:32px}.header-actions{gap:4px}.header-actions button{padding:8px;font-size:12px}.workspace{padding-inline:12px}.lab-banner{margin-inline:12px}.landing-lab{gap:12px}.fields{gap:8px}.file-formats{width:min(230px,calc(100vw - 24px))}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media(forced-colors:active){button[aria-selected=true],button[aria-pressed=true]{outline:2px solid Highlight}.panel{border-color:CanvasText}}

/* Workspace header actions follow the Humanitarian Relief reference geometry. */
.header-actions{gap:8px}.header-actions .guide-entry,.header-actions #project-menu{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:8px 12px;background:var(--paper);border:2px solid var(--ink);border-radius:2px;box-shadow:2px 2px 0 var(--ink);font-size:12px}.header-actions .guide-entry{margin-right:8px;font-weight:700}.header-actions .guide-entry:hover,.header-actions #project-menu:hover,.header-actions .guide-entry[aria-expanded=true],.header-actions #project-menu[aria-expanded=true]{background:var(--selected)}.header-actions .guide-entry:active,.header-actions #project-menu:active{box-shadow:none}.header-actions .ui-icon{width:16px;height:16px;flex:none;margin:0}.header-actions #project-menu .ui-icon{transition:transform .15s ease-out}.header-actions #project-menu[aria-expanded=true] .ui-icon{transform:rotate(180deg)}
@media(max-width:700px){.header-actions .guide-entry{margin-right:6px}}

/* The guide follows the relief lab's brief-first, balanced reading layout. */
#guide-dialog .guide-content{padding-top:24px}
#guide-dialog .guide-scenario{grid-template-columns:minmax(0,3fr) minmax(0,2fr);align-items:center;gap:24px;margin-bottom:32px}
#guide-dialog .guide-scenario>div:first-child{min-width:0}
#guide-dialog .guide-scenario h2{font-size:26px;line-height:1.2;margin:0 0 16px}
#guide-dialog .guide-scenario .landing-carousel{width:100%;max-width:none;margin:0;padding:0}
#guide-dialog .guide-scenario .landing-scenes{max-height:none}
#guide-dialog .guide-columns{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:32px 40px}
#guide-dialog .guide-columns>section{min-width:0;border-top:1px solid var(--line);padding-top:20px}
#guide-dialog .guide-columns h2{font-size:20px;line-height:1.3;margin:0 0 14px}
#guide-dialog .guide-columns h3{font-size:16px;line-height:1.35;margin:24px 0 10px}
#guide-dialog .guide-columns p,#guide-dialog .guide-columns li{font-size:14px;line-height:1.65}
#guide-dialog .guide-columns li{margin-bottom:10px}
#guide-dialog .guide-columns ol,#guide-dialog .guide-columns ul{padding-left:22px}
#guide-dialog .guide-columns .section-diagram{display:block;width:min(100%,240px);height:auto;margin:14px auto 8px}
#guide-dialog .guide-columns .formula{text-align:center;margin:8px 0 16px}
@media(max-width:700px){#guide-dialog .guide-scenario,#guide-dialog .guide-columns{grid-template-columns:minmax(0,1fr)}#guide-dialog .guide-scenario .landing-carousel{max-width:300px;margin-inline:auto}#guide-dialog .guide-columns{gap:24px}}

/* Guide header follows the full-width Humanitarian Relief guide rule. */
#guide-dialog .guide-heading{top:-24px;margin:0 -24px;padding:16px 24px;background:var(--paper);border-bottom:2px solid var(--ink)}
#guide-dialog .guide-heading h1{font:700 24px/1.2 Arial,Helvetica,sans-serif;margin:0}
#guide-dialog #guide-close{background:var(--accent);border:1px solid var(--ink);font-size:13px;font-weight:700}
#guide-dialog #guide-close:hover{background:var(--selected)}
@media(max-width:700px){#guide-dialog .guide-heading{top:-16px;margin-inline:-16px;padding:12px 16px}#guide-dialog .guide-heading h1{font-size:20px;white-space:nowrap}}

/* Keep the guide masthead compact and flush with the dialog frame. */
#guide-dialog{padding:0 24px 24px}
#guide-dialog .guide-heading{top:0;padding-block:8px;border-bottom-width:1px}
@media(max-width:700px){#guide-dialog{padding:0 16px 16px}#guide-dialog .guide-heading{top:0;padding-block:6px}}

/* Separate the sticky guide masthead from its reading surface. */
#guide-dialog{background:var(--surface)}
#guide-dialog .guide-heading{background:var(--paper)}

/* Match Humanitarian Relief guide insets and masthead spacing. */
#guide-dialog{padding:0;background:var(--surface)}
#guide-dialog .guide-heading{top:0;margin:0;padding:16px 32px;border-bottom:2px solid var(--ink);background:var(--paper)}
#guide-dialog .guide-content{padding:24px 32px 32px}
@media(max-width:700px){#guide-dialog{padding:0}#guide-dialog .guide-heading{top:0;margin:0;padding:12px 16px}#guide-dialog .guide-content{padding:20px 16px 24px}}