/* Private case reader. Public presentation only; no case content or access data. */
@font-face{font-family:Switzer;src:url('/fonts/switzer-400.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:Switzer;src:url('/fonts/switzer-500.woff2') format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:Switzer;src:url('/fonts/switzer-600.woff2') format('woff2');font-weight:600 800;font-display:swap}
@font-face{font-family:'IBM Plex Mono';src:url('/fonts/ibm-plex-mono-latin-400-normal.woff2') format('woff2');font-display:swap}
:root{--paper:#faf8f2;--raised:#fffefa;--ink:#1c1a16;--muted:#57534a;--line:#d8d3c6;--forest:#1f4d3a;--dark:#163b2c;--soft:#e8f5ec;--mono:'IBM Plex Mono',Consolas,monospace;color-scheme:light}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1rem/1.6 Switzer,Arial,sans-serif;-webkit-text-size-adjust:100%}
a{color:var(--forest);text-underline-offset:.2em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
button,input{font:inherit}
button,summary,a{touch-action:manipulation}
:focus-visible{outline:3px solid var(--forest);outline-offset:3px}
.lr-sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.lr-skip{position:fixed;top:.5rem;left:.5rem;z-index:10;background:var(--raised);padding:.65rem 1rem;transform:translateY(-180%)}
.lr-skip:focus{transform:none}
.lr-header{border-top:4px solid var(--forest);border-bottom:1px solid var(--line);background:var(--raised)}
.lr-case-views{display:flex;gap:.15rem 1.4rem;flex-wrap:wrap;margin-bottom:1.4rem;border-bottom:1px solid var(--line)}
.lr-case-views a{display:inline-block;padding:.6rem 0;color:var(--muted);text-decoration:none}
.lr-case-views a[aria-current]{color:var(--forest);box-shadow:inset 0 -3px var(--forest);font-weight:650}
.lr-clock{border:1px solid var(--line);padding:1.1rem 1.35rem;background:var(--raised)}
.lr-clock label{display:block;margin:.6rem 0}.lr-clock input{display:block;max-width:100%;padding:.45rem;border:1px solid var(--line)}
.lr-clock [data-elapsed]{font:500 1.05rem/1.4 var(--mono);font-variant-numeric:tabular-nums}
.lr-outputs{list-style:none;padding:0}.lr-outputs label{display:flex;align-items:baseline;gap:.6rem}.lr-outputs input{accent-color:var(--forest)}
.lr-header-inner,.lr-wrap,.lr-footer{max-width:1240px;margin-inline:auto;padding-inline:clamp(1rem,3.8vw,3.15rem)}
.lr-header-inner{display:flex;align-items:center;gap:1rem;min-height:4.25rem}
.lr-wordmark{font-size:1.55rem;letter-spacing:-.075em;text-decoration:none;font-weight:600;color:var(--forest);line-height:1.2;padding:.65rem 0}
.lr-header-label{font-size:.83rem;color:var(--muted);border-left:1px solid var(--line);padding-left:1rem}
.lr-header nav{margin-left:auto;display:flex;align-items:center;gap:1rem}
.lr-header nav a,.lr-modebar a,.lr-footer a,.lr-back{display:inline-flex;align-items:center;min-height:44px;font-size:.86rem}
.lr-wrap{padding-top:clamp(1rem,2.5vw,2rem)}
.lr-layout{display:grid;grid-template-columns:minmax(15.2rem,19rem) minmax(0,1fr);align-items:start;gap:clamp(1.6rem,4.5vw,4.5rem)}
.lr-sidebar{position:sticky;top:1rem;max-height:calc(100vh - 2rem);overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable;padding:3px 5px 4px 3px}
.lr-outline,.lr-timed-outline,.lr-shared,.lr-extension{border-block:1px solid var(--line)}
.lr-outline,.lr-timed-outline{border-top:2px solid var(--forest)}
summary{cursor:pointer;color:var(--forest);min-height:44px;padding:.72rem .25rem;font-weight:600;list-style:none}
summary::-webkit-details-marker{display:none}
summary:after{content:'+';font:400 1rem/1 var(--mono);margin-left:auto;align-self:center}
details[open]>summary:after{content:'−'}
.lr-outline>summary,.lr-shared>summary,.lr-extension>summary{display:flex;gap:.65rem;align-items:center}
.lr-mono,.lr-file-meta,.lr-number,.lr-file-role,.lr-paging small{font-family:var(--mono)}
.lr-outline summary .lr-mono{font-size:.68rem;font-weight:400;color:var(--muted)}
.lr-outline-body{padding-bottom:.55rem}
.lr-case-title{font-size:1.13rem;line-height:1.25;font-weight:600;letter-spacing:-.025em;margin:.35rem .25rem}
.lr-case-title a{color:var(--ink);text-decoration:none}
.lr-case-title a:hover{text-decoration:underline}
.lr-sidebar-descriptor{font-size:.85rem;color:var(--muted);margin:.35rem .25rem .9rem}
.lr-lesson-list,.lr-files{list-style:none;margin:0;padding:0}
.lr-lesson-list li{margin:0}
.lr-lesson-list a{display:flex;align-items:center;gap:.7rem;min-height:44px;border-bottom:1px solid var(--line);padding:.62rem .65rem .62rem .45rem;text-decoration:none;color:var(--ink);line-height:1.3;font-size:.92rem}
.lr-lesson-list a:hover,.lr-file:hover,.lr-paging a:hover{background:var(--raised);text-decoration:underline}
.lr-lesson-list a[aria-current=page]{background:var(--soft);box-shadow:inset 3px 0 var(--forest);font-weight:600;color:var(--dark);padding-left:.7rem}
.lr-number{font-size:.7rem;color:var(--muted);min-width:1.24rem}
.lr-check{margin-left:auto;color:var(--forest);font-weight:600}
.lr-progress{padding:.9rem .3rem .25rem}
.lr-progress label,.lr-progress p,.lr-shared p{font-size:.8rem;line-height:1.45}
.lr-progress p{color:var(--muted);margin:.26rem 0}
.lr-progress progress{display:block;width:100%;height:.38rem;margin:.5rem 0;accent-color:var(--forest);border:0;background:var(--line)}
.lr-progress progress::-webkit-progress-bar{background:var(--line)}
.lr-progress progress::-webkit-progress-value{background:var(--forest)}
.lr-progress progress::-moz-progress-bar{background:var(--forest)}
.lr-shared{margin-top:.75rem}
.lr-shared>p{margin:.1rem .25rem .7rem;color:var(--muted)}
.lr-timed-outline{padding:.9rem .2rem}
.lr-timed-outline .lr-lesson-list{margin-top:1rem}
main{width:100%;max-width:55rem;min-width:0;padding-bottom:2.75rem}
main:focus{outline:none}
.lr-modebar{display:flex;align-items:center;flex-wrap:wrap;justify-content:space-between;gap:.35rem 1rem;border-top:2px solid var(--forest);border-bottom:1px solid var(--line);margin-bottom:clamp(1.2rem,2.8vw,2rem)}
.lr-modebar a{font-size:.8rem}
.lr-file-role,.lr-paging small{font-size:.72rem;letter-spacing:.045em;color:var(--forest);font-weight:400}
.lr-eyebrow{margin:0 0 .55rem;color:var(--forest);font:600 .875rem/1.4 Switzer,Arial,sans-serif}
h1,h2,h3{font-weight:600;letter-spacing:-.035em;line-height:1.17;text-wrap:balance}
h1{font-size:clamp(2.05rem,4.3vw,3.45rem);margin:.15rem 0 .65rem;max-width:29ch}
h2{font-size:clamp(1.38rem,2.4vw,1.8rem);margin:0 0 .8rem}
h3{font-size:1.08rem;margin:0}
main p,main ul,main ol,main dl{max-width:67ch}
main p{margin:.65rem 0 1rem;overflow-wrap:anywhere}
main ul:not(.lr-files),main ol{padding-left:1.45rem}
main li{margin-block:.45rem;overflow-wrap:anywhere}
main li::marker{color:var(--forest)}
.lr-deck{font-size:clamp(1.1rem,1.7vw,1.32rem);line-height:1.45;margin-bottom:1.3rem;max-width:57ch}
.lr-quick{margin:.7rem 0 1.45rem;border-block:1px solid var(--line)}
.lr-quick ul{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,12rem),1fr));gap:0 .85rem;list-style:none;max-width:none;margin:0}
main .lr-quick ul:not(.lr-files){padding:0}
.lr-quick li{margin:0}
.lr-quick a{display:grid;align-content:center;gap:.12rem;min-height:48px;height:100%;padding:.55rem .25rem;font-size:.9rem;line-height:1.35;text-decoration:none}
.lr-quick a:hover,.lr-quick a:focus-visible{background:var(--soft)}
.lr-quick span{color:var(--muted);font-size:.78rem}
.lr-quick strong{font-weight:600;text-decoration:underline;text-underline-offset:.2em}
.lr-exhibit{margin:1.5rem 0 0;border:1px solid var(--line);background:var(--raised);break-inside:avoid}
.lr-exhibit img{display:block;width:100%;height:auto}
.lr-exhibit figcaption{border-bottom:1px solid var(--line);padding:.65rem 1rem .35rem;font-size:.88rem;line-height:1.45}
.lr-exhibit figcaption p{margin:0}
.lr-exhibit figcaption a{display:inline-flex;align-items:center;min-height:44px}
.lr-muted{color:var(--muted)}
.lr-section,.lr-example,.lr-extension,.lr-finish{margin-top:clamp(1.65rem,3.5vw,2.7rem)}
.lr-section{border-top:1px solid var(--line);padding-top:1.25rem}
.lr-example{border:1px solid var(--line);border-left:3px solid var(--forest);background:var(--raised);padding:clamp(1rem,2.5vw,1.55rem)}
.lr-example h2{font-size:1.35rem}
.lr-example p:last-child,.lr-section>p:last-child{margin-bottom:0}
.lr-diagnosis{margin:0}
.lr-diagnosis div{padding:.7rem 0;border-bottom:1px solid var(--line)}
.lr-diagnosis dt{font-weight:600;line-height:1.4}
.lr-diagnosis dd{margin:.35rem 0 0;color:var(--muted)}
.lr-files{max-width:none}
.lr-files li{margin:0}
.lr-file{display:flex;align-items:center;gap:1rem;justify-content:space-between;padding:.85rem .2rem;min-height:48px;border-top:1px solid var(--line);text-decoration:none;color:var(--ink)}
.lr-file-copy{display:grid;gap:.15rem;min-width:0;overflow-wrap:anywhere}
.lr-file-copy strong{font-weight:600;color:var(--forest)}
.lr-file-copy .lr-muted{font-size:.9rem;line-height:1.4}
.lr-file-meta{display:inline-flex;align-items:center;gap:.35rem;flex-shrink:0;font-size:.7rem;white-space:nowrap;color:var(--muted)}
.lr-download{font-size:1rem;color:var(--forest)}
.lr-files-compact .lr-file{display:block;padding:.65rem .3rem}
.lr-files-compact strong{font-size:.85rem}
.lr-files-compact .lr-file-meta{font-size:.68rem}
.lr-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;max-width:100%;padding:.6rem 1rem;background:var(--forest);color:white;border:1px solid var(--forest);font:600 .93rem/1.35 Switzer,Arial,sans-serif;text-align:center;text-decoration:none;cursor:pointer}
.lr-button:hover{background:var(--dark);color:white;text-decoration:none}
.lr-button-secondary,.lr-button[aria-pressed=true]{background:var(--raised);color:var(--forest)}
.lr-button-secondary:hover,.lr-button[aria-pressed=true]:hover{background:var(--soft);color:var(--dark)}
.lr-track-choice{display:flex;justify-content:space-between;align-items:center;gap:1rem;border-top:1px solid var(--line);padding:1rem 0}
.lr-track-choice p{margin:.25rem 0 0;color:var(--muted);font-size:.9rem}
.lr-track-choice .lr-button{flex-shrink:0}
.lr-finish p{margin:.4rem 0;font-size:.88rem}
.lr-paging{border-top:1px solid var(--line);margin-top:1.3rem;display:flex;justify-content:space-between;gap:.8rem}
.lr-paging a{display:grid;align-content:center;gap:.2rem;flex:1;min-height:60px;padding:.7rem .3rem;text-decoration:none;color:var(--forest);line-height:1.35}
.lr-paging a:last-child{text-align:right}
.lr-paging small{color:var(--muted)}
.lr-preview{border-left:3px solid var(--forest);padding:.2rem .65rem;color:var(--forest);font-size:.8rem;margin:0 0 1rem}
.lr-footer{display:flex;align-items:center;justify-content:space-between;gap:1rem;border-top:1px solid var(--line);color:var(--muted);padding-block:.8rem;font-size:.85rem}
.learning-access{width:min(42rem,calc(100% - 2rem));margin:clamp(2rem,10vh,7rem) auto;border:1px solid var(--line);border-top:4px solid var(--forest);padding:clamp(1.25rem,4vw,2.5rem);background:var(--raised)}
.learning-access>p:first-child{font:400 .75rem/1.4 var(--mono);color:var(--forest);margin:0 0 1rem}
.learning-access h1{font-size:clamp(1.8rem,4vw,2.5rem)}
.learning-access form{display:grid;gap:.55rem;margin:1.4rem 0}
.learning-access label{font-weight:600}.learning-access input{width:100%;min-height:44px;border:1px solid var(--muted);padding:.55rem .75rem;background:var(--raised);color:var(--ink)}
.learning-access button{justify-self:start;min-height:44px;background:var(--forest);color:white;border:1px solid var(--forest);padding:.55rem 1rem;font-weight:600;cursor:pointer}.learning-access button:hover{background:var(--dark)}

/* Workbook-led lessons use one teaching column, including the full-width exhibits. */
.lr-visual .lr-modebar { margin-bottom: 1rem; }
.lr-visual h1 { font-size: clamp(1.9rem, 3vw, 2.75rem); }
.lr-visual .lr-deck { margin-bottom: 1rem; }
.lr-working-files { padding: .9rem 1rem; background: var(--raised); border: 1px solid var(--line); }
.lr-working-files h2 { font-size: 1.1rem; margin: 0; }
.lr-working-files .lr-quick { border: 0; margin: .5rem 0; }
.lr-working-files .lr-quick ul { gap: .35rem .8rem; }
.lr-working-files .lr-quick a { padding: .45rem .6rem; border-left: 2px solid var(--line); }
.lr-working-files .lr-quick li:first-child a { border-color: var(--forest); background: var(--soft); }
.lr-working-files .lr-quick li:first-child span { color: var(--forest); }
.lr-working-files p { margin: .5rem 0 .15rem; font-size: .93rem; }
.lr-working-files small, .lr-model-checks small { display: block; color: var(--muted); line-height: 1.45; }
main .lr-orientation { margin: 1rem 0 1.45rem; }
main .lr-build-steps { max-width: none; margin: 0; padding-left: 1.65rem; }
main .lr-build-steps > li { margin: 0; padding: .9rem 0 1.15rem .15rem; border-top: 1px solid var(--line); scroll-margin-top: 1rem; }
.lr-build-steps > li::marker { font: 500 .91rem var(--mono); }
.lr-build-steps h3 { font-size: clamp(1.1rem, 2vw, 1.32rem); line-height: 1.35; }
.lr-build-steps h3 a { color: inherit; text-decoration: none; }
.lr-build-steps h3 a:hover, .lr-build-steps h3 a:focus-visible { text-decoration: underline; }
.lr-build-steps p { margin: .35rem 0 .6rem; }
.lr-build-steps li > :last-child { margin-bottom: 0; }
.lr-build-steps .lr-step-source, .lr-build-steps .lr-step-example, .lr-build-steps .lr-step-warning { font-size: .9rem; }
.lr-step-source { color: var(--muted); }
.lr-step-source strong, .lr-step-example strong, .lr-step-warning strong { margin-right: .3rem; }
.lr-step-warning { border-left: 2px solid var(--line); padding-left: .65rem; }
.lr-formula { display: block; margin: .6rem 0; padding: .55rem .75rem; background: var(--soft); color: var(--dark); white-space: pre-wrap; overflow-wrap: anywhere; }
.lr-formula code { font: 400 .875rem/1.5 var(--mono); }
.lr-table-wrap { width: fit-content; max-width: 100%; overflow-x: auto; margin: .7rem 0; border: 1px solid var(--line); }
.lr-table-wrap table { border-collapse: collapse; font-size: .9rem; line-height: 1.45; font-variant-numeric: tabular-nums; }
.lr-table-wrap th, .lr-table-wrap td { padding: .44rem .7rem; text-align: left; vertical-align: top; }
.lr-table-wrap th { color: var(--forest); background: var(--soft); }
.lr-table-wrap td { border-top: 1px solid var(--line); background: var(--raised); }
.lr-step-figure { margin: .85rem 0; border: 1px solid var(--line); background: var(--raised); break-inside: avoid; }
.lr-step-figure .lr-figure-state { margin: 0; padding: .42rem .75rem; max-width: none; border-bottom: 1px solid var(--line); color: var(--muted); font-size: .8rem; }
.lr-step-figure img { display: block; max-width: 100%; height: auto; margin: 0 auto; }
.lr-step-figure figcaption { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; column-gap: .8rem; padding: .2rem .75rem; border-top: 1px solid var(--line); font-size: .87rem; line-height: 1.45; }
.lr-step-figure figcaption span { max-width: 67ch; }
.lr-step-figure figcaption a { display: inline-flex; align-items: center; min-height: 44px; }
.lr-model-checks { border-top: 2px solid var(--forest); padding-top: 1rem; margin: .9rem 0 1.25rem; }
.lr-model-checks h2 { margin-bottom: .35rem; }
.lr-model-checks > p { margin: .35rem 0 .75rem; }
main .lr-model-checks ul { list-style: none; max-width: none; margin: 0 0 .6rem; padding: 0; }
main .lr-model-checks li { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; margin: 0; gap: .15rem .5rem; padding: .65rem .75rem; background: var(--raised); border-block-start: 1px solid var(--line); }
.lr-model-checks li:last-child { border-block-end: 1px solid var(--line); }
.lr-check-name span { display: block; color: var(--muted); font-size: .8rem; }
.lr-check-value { color: var(--dark); font: 500 1.05rem var(--mono); }
.lr-model-checks li p { grid-column: 1 / -1; margin: 0; font-size: .9rem; }
.lr-lesson-detail { border-top: 1px solid var(--line); }
.lr-lesson-detail summary { display: flex; align-items: center; gap: .6rem; }
.lr-lesson-detail .lr-diagnosis { margin: 0 0 .75rem; }
.lr-lesson-detail .lr-diagnosis div { border: 0; padding: .3rem 0; }
.lr-visual .lr-finish { margin-top: 1.3rem; }
.lr-choice-layout { padding-bottom: 2rem; }
.lr-choice-layout main { max-width: none; padding: 0; }
.lr-choice-intro { max-width: 65ch; margin-bottom: 1.15rem; }
.lr-choice-intro h1 { font-size: clamp(1.85rem, 3.3vw, 2.75rem); max-width: none; }
.lr-choice-intro p { margin: .35rem 0; }
.lr-choice-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .85rem; }
.lr-choice { min-width: 0; display: flex; flex-direction: column; align-items: flex-start; padding: clamp(.9rem, 2vw, 1.35rem); background: var(--raised); border: 1px solid var(--line); border-top: 3px solid var(--line); }
.lr-choice-guided { border-top-color: var(--forest); }
.lr-choice h2 { font-size: clamp(1.22rem, 2.2vw, 1.55rem); margin: 0; }
main .lr-choice-time { margin: .25rem 0; color: var(--forest); font-size: .85rem; font-weight: 600; }
main .lr-choice-copy { margin: .42rem 0 .95rem; }
.lr-choice .lr-button { margin-top: auto; overflow-wrap: anywhere; }
main .lr-choice-note { max-width: 80ch; margin: 1rem 0; font-size: .93rem; }
.lr-choice-prerequisites { margin-top: 1rem; }
.lr-choice-layout .lr-sidebar { position: static; max-height: none; overflow: visible; padding: 0; scrollbar-gutter: auto; }
.lr-choice-layout .lr-outline { border-top: 1px solid var(--line); }
.lr-choice-layout .lr-shared { margin-top: 0; border-top: 0; }
.lr-choice-layout .lr-outline-body { max-width: 44rem; }
.lr-build-steps .lr-relationship { font-size: 1.02rem; font-weight: 600; color: var(--dark); margin: .7rem 0 .3rem; }
.lr-relationship + .lr-formula { margin-top: .3rem; }
.lr-formula-label { display: block; font: 400 .8rem/1.45 Switzer,Arial,sans-serif; color: var(--muted); margin-bottom: .12rem; }
.lr-step-detail { border-block: 1px solid var(--line); margin: .55rem 0; }
.lr-step-detail summary { display: flex; align-items: center; gap: .4rem; font-size: .9rem; }
@media(max-width:700px) {
  .lr-choice-grid { grid-template-columns: minmax(0,1fr); gap: .55rem; }
  .lr-choice { padding: .8rem .9rem; border-top-width: 1px; border-left-width: 3px; }
  .lr-choice-guided { border-top-color: var(--line); border-left-color: var(--forest); }
  main .lr-choice-copy { margin: .2rem 0 .55rem; }
}
@media(max-width:880px){.lr-layout{grid-template-columns:minmax(0,1fr);gap:1.3rem}.lr-sidebar{position:static;max-height:none;overflow:visible;padding:0;scrollbar-gutter:auto}.lr-outline-body{padding:.2rem .25rem .8rem}.lr-shared{margin-top:0;border-top:0}.lr-timed-outline{padding:.55rem 0}.lr-timed-outline .lr-case-title,.lr-timed-outline>.lr-eyebrow,.lr-timed-outline>.lr-back{display:none}.lr-timed-outline .lr-lesson-list{display:flex;flex-wrap:wrap;gap:.5rem 1rem;margin:0}.lr-timed-outline .lr-lesson-list a{border-bottom:0}.lr-modebar{margin-bottom:1rem}.lr-header-inner{min-height:3.5rem}main{max-width:none}}
@media(max-width:560px){.lr-header-inner{gap:.6rem}.lr-header-label{display:none}.lr-header nav{gap:.7rem}.lr-track-choice{align-items:flex-start;flex-direction:column}.lr-file{align-items:flex-start;flex-direction:column;gap:.35rem}.lr-paging{gap:.55rem}.lr-paging a{font-size:.88rem}.lr-section{padding-top:.95rem}main li{margin-block:.6rem}}
@media print{.lr-header nav,.lr-sidebar,.lr-modebar,.lr-finish,.lr-paging,.lr-footer,.lr-skip,.lr-button,.lr-return{display:none!important}.lr-layout{display:block}.lr-wrap,.lr-header-inner{padding:0}.lr-header{border:0}body{background:white;color:black}main{max-width:none}.lr-example,.lr-file{break-inside:avoid}h1,h2,h3{break-after:avoid}.lr-section{margin-top:1rem}}