:root{--primary:#344faf;--primary-hover:#293e8c;--on-primary:#fff;--accent:#344faf;--ink:#253049;--muted:#566179;--canvas:#edf0f8;--paper:#fcfcff;--line:#cdd5e5;--soft:#e0e6f5;--error:#9c352f;--error-bg:#fff0ed;--rail-bg:#243354;--rail-text:#d4dff4;--rail-muted:#bccce8;--rail-hover:#34466b;--rail-selected:#dce5ff;--rail-selected-ink:#24386f;--focus-outline:#a45f18;--input-line:#8b9bb5;--radius:12px;--space:24px;font-family:"Avenir Next",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;color:var(--ink);background:var(--canvas)}
:root[data-theme=sand]{--primary:#8e492e;--primary-hover:#703a26;--on-primary:#fffaf2;--accent:#8e492e;--ink:#403630;--muted:#6e5b4f;--canvas:#f1eae0;--paper:#fffaf2;--line:#d8cabe;--soft:#ecdfd1;--error:#a02f31;--error-bg:#fff0ea;--rail-bg:#3f322c;--rail-text:#efded0;--rail-muted:#d4bdae;--rail-hover:#584339;--rail-selected:#f2dfc9;--rail-selected-ink:#653d29;--focus-outline:#865614;--input-line:#ad9380}
:root[data-theme=midnight]{--primary:#a5baff;--primary-hover:#c2cfff;--on-primary:#19284f;--accent:#b1c4ff;--ink:#e2e8f3;--muted:#a6b3c9;--canvas:#151b27;--paper:#1e2736;--line:#3a465c;--soft:#2b3850;--error:#ffb1a5;--error-bg:#492d32;--rail-bg:#111722;--rail-text:#cad5ea;--rail-muted:#a6b3c9;--rail-hover:#25334b;--rail-selected:#344a7b;--rail-selected-ink:#edf1ff;--focus-outline:#edb57e;--input-line:#71809a}
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26px;font-size:12px;color:var(--muted)}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden;white-space:nowrap}.skip{position:fixed;left:16px;top:-100px;padding:12px;background:var(--paper);z-index:10}.skip:focus{top:12px}.noscript{padding:30px}.compact{margin-top:10px}.view-switch{display:flex;gap:18px;border-bottom:1px solid var(--line);margin:25px 0}.view-switch button{background:transparent;border:0;border-bottom:3px solid transparent;padding:12px 2px;font-size:14px;color:var(--muted)}.view-switch button[aria-pressed=true]{border-color:var(--primary);color:var(--ink)}.review-panel{padding-top:18px}.review-panel h3{margin-bottom:10px}.checkpoint{padding:18px 0;margin:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}.checkpoint strong{color:var(--ink)}.link-path{display:block;margin-top:8px;font-size:12px;overflow-wrap:anywhere;color:var(--muted)}.first-loop{color:var(--primary);font-size:13px;margin:25px 0 0}.studio-header{padding-bottom:12px}.studio-line{display:flex;gap:14px;font-size:13px;color:var(--muted);margin:22px 0}.studio-line span+span::before{content:'→';margin-right:14px;color:var(--accent)}.saved-note{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;padding:16px;background:var(--soft);border-radius:6px}.import-preview{margin-top:16px}.status-label{font-size:12px;color:var(--muted);margin-top:10px}.parked{display:inline-block;color:var(--muted);font-size:12px;margin-left:8px}
@media(max-width:1180px){.shell{grid-template-columns:215px minmax(0,1fr)}main{padding:36px 32px 50px}.topbar{padding:0 32px}.today-layout{grid-template-columns:minmax(0,1fr) 195px;gap:24px}.lesson-layout{grid-template-columns:minmax(0,1fr)}.lesson-aside{border-top:1px solid var(--line);padding-top:22px;display:grid;grid-template-columns:1fr 1fr;gap:22px}.lesson-aside .divider{display:none}.brand{margin-left:4px}.rail{padding-left:15px;padding-right:15px}}
@media(max-width:900px){.shell{grid-template-columns:180px minmax(0,1fr)}.rail{padding:26px 12px}.brand{gap:8px;font-size:19px}.brand-mark{width:29px;height:36px}.rail nav a{padding:11px 9px;font-size:12px;gap:7px}.rail nav a>span:first-child{width:18px}.today-layout{grid-template-columns:1fr}.loop-note{display:none}.next-session h2{max-width:24ch}.session-row .row-type{display:none}.topbar{padding:0 25px}main{padding:32px 25px 45px}.next-session,.lesson-pane{padding:25px}}
@media(max-width:650px){.shell{display:block}.rail{height:auto;position:static;padding:20px 18px 12px}.brand{margin:0 0 21px;font-size:21px}.brand small{font-size:11px}.brand-mark{width:32px;height:37px}.rail nav{display:flex;gap:6px;overflow-x:auto;padding:2px 1px 8px;scrollbar-width:thin}.rail nav a{flex-shrink:0;padding:9px 11px;gap:6px;font-size:12px;min-height:40px}.rail nav a>span:first-child{display:none}.rail-foot{display:none}.topbar{height:54px;padding:0 20px;font-size:11px}#save-status{font-size:11px}.storage-alert{padding:15px 20px}main{padding:29px 20px 45px}h1{font-size:28px}.intro{font-size:14px;margin-bottom:24px}.next-session{padding:25px 22px}.next-session h2{font-size:26px;margin-top:18px}.next-session .description{font-size:14px}.session-meta{gap:9px 12px;font-size:11px}.actions{gap:10px}.next-session .actions .primary{width:100%}.session-heading h1{font-size:24px}.session-heading .btn{font-size:12px;padding:9px 10px}.session-heading{gap:12px}.steps li{font-size:10px;padding-top:9px}.lesson-pane{padding:23px 19px}.lesson-pane h2{font-size:21px}.prompt{font-size:16px}.choice{font-size:14px;padding:13px 12px}.lesson-aside{display:block}.lesson-aside>div+div{margin-top:24px}.form-grid{grid-template-columns:1fr;gap:0}.session-row{gap:12px;padding:18px 0}.session-row h3{font-size:14px}.session-row .btn{font-size:12px;padding:9px 11px}.session-row p{font-size:12px}.footer{padding:0 20px 24px}.section-heading h2{font-size:18px}.section-heading a{font-size:12px}.trace{padding:18px 14px}.trace pre{font-size:13px}.timer time{font-size:24px;min-width:85px}.history-entry dl{grid-template-columns:1fr;gap:6px}.history-entry dd{margin-bottom:12px}.history-entry summary{font-size:15px}.studio-line{font-size:11px;gap:9px}.studio-line span+span::before{margin-right:9px}.filterbar button{font-size:12px;padding:8px 10px}.notebook-section{padding-top:22px}.note{padding:15px;font-size:13px}}
@media(prefers-reduced-motion:no-preference){html[data-motion=full] .choice,html[data-motion=full] .btn,html[data-motion=full] .rail nav a{transition:background-color 160ms ease-out,border-color 160ms ease-out}}
@media print{.rail,.topbar,.footer,.actions{display:none}.shell{display:block}main{padding:0;max-width:none}.lesson-pane{border:0}.workspace{background:var(--paper)}}
/* Finish review: all mobile destinations remain visible and stages stay legible. */
@media(max-width:650px){.rail nav{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;overflow:visible;padding:0}.rail nav a{grid-column:span 2;justify-content:center;min-height:44px;font-size:12px;padding:9px 6px}.rail nav a:nth-child(n+4){grid-column:span 3}.rail nav .count{margin-left:2px}.steps{margin:24px 0}.steps li:not([aria-current=step]){display:none}.steps li[aria-current=step]{font-size:14px;display:flex;align-items:center;gap:12px;padding-top:12px}.steps li[aria-current=step]::after{content:'of 5 stages';font-size:12px;font-weight:400;color:var(--muted);margin-left:auto}.studio-line{flex-wrap:wrap}.view-switch{gap:14px;flex-wrap:wrap}.view-switch button{min-height:44px}.filterbar button{min-height:44px}.session-row .btn{min-height:44px}.check{min-height:32px}.check input{margin-top:2px}}

/* September refinement: a working notebook with visible track identity. */

.brand{margin-left:0;gap:11px}.brand-icon{width:48px;height:48px;object-fit:cover;border-radius:10px;flex-shrink:0}.brand small{color:var(--rail-muted)}.brand-mark{letter-spacing:0}
h1{font-family:inherit;font-weight:600;font-size:36px;letter-spacing:-.025em;line-height:1.2;text-wrap:pretty}.next-session h2{font-family:inherit;font-weight:600;font-size:32px;max-width:23ch}.intro{line-height:1.6}.page-kicker{font-size:13px;color:var(--muted);margin-bottom:12px}.page-top{display:flex;justify-content:space-between;align-items:flex-start;gap:24px}.page-top .intro{margin-bottom:25px}.page-tools{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:flex-end;padding-top:6px;font-size:13px}.library-count{flex-shrink:0;color:var(--muted);font-size:12px;padding-top:10px}.topbar-tools{display:flex;align-items:center;gap:17px}.topbar-tools .text-button{font-size:11px;text-decoration:none;min-height:36px}.backup-link{font-size:12px}.topbar #save-status{padding-left:15px;border-left:1px solid var(--line)}.btn,.button-link{padding:11px 16px;border-radius:8px;font-weight:600}.btn.primary,.button-link.primary{background:var(--primary);color:var(--on-primary)}.btn:hover:not(:disabled),.button-link:hover{border-color:var(--input-line)}.btn.primary:hover,.button-link.primary:hover{background:var(--primary-hover);border-color:var(--primary-hover);color:var(--on-primary)}.action-arrow{display:inline-block}.text-button:hover{color:var(--primary-hover)}.rail nav a{border-radius:8px}.next-session{padding:34px}.next-session .pill{background:transparent;padding:0;font-weight:600}.next-session .actions{margin-top:26px}.next-session .fine{max-width:55ch}.loop-note li{padding-bottom:27px}.session-row{padding:22px 0;gap:22px}.session-row h3{font-size:17px;font-weight:600}.session-row p{font-size:13px;max-width:65ch}.session-row .row-type{width:120px;min-width:120px;font-size:11px;line-height:1.5}.session-row .btn{min-width:91px}.filterbar{padding-bottom:22px;margin:3px 0 0;gap:8px;border-bottom:1px solid var(--line)}.filterbar button{border-radius:8px;background:transparent;color:var(--muted);font-size:13px;padding:10px 13px;display:inline-flex;gap:12px;align-items:center;min-height:44px}.filterbar button[aria-pressed=true]{background:var(--primary);color:var(--on-primary)}.filter-count{font-variant-numeric:tabular-nums;font-size:11px;opacity:.8}.track-context{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:28px 0 20px}.track-context h2{font-size:22px}.track-context p{font-size:14px;color:var(--muted);margin-top:8px;max-width:57ch}.search-form{display:flex;gap:8px;align-items:center}.search-form input[type=search]{margin:0;border:1px solid var(--input-line);background:var(--paper);color:var(--ink);font-size:14px;border-radius:8px;padding:11px 13px;min-width:0;width:100%;min-height:44px}.track-context .search-form{min-width:285px;max-width:350px}.search-form .btn{font-size:13px;padding:10px 13px;flex-shrink:0}.result-heading{display:flex;align-items:center;justify-content:space-between;min-height:40px;gap:12px;font-size:12px;color:var(--muted)}.shared-foundations{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:23px 0;margin-top:16px}.shared-foundations h3{font-size:15px}.shared-foundations p,.capstone-link p{font-size:13px;color:var(--muted);margin-top:6px}.shared-foundations .button-link{flex-shrink:0}.capstone-link{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-top:20px;padding:25px 0;border-top:1px solid var(--line)}.capstone-link h2{font-size:17px;letter-spacing:-.015em}.capstone-link a{font-size:13px;flex-shrink:0}.session-tools{display:flex;align-items:center;gap:18px;flex-shrink:0}.session-heading h1{font-size:31px}.progress-track{height:3px;background:var(--line);margin-top:28px;overflow:hidden}.progress-ink{display:block;height:100%;width:100%;background:var(--primary);transform-origin:left center;transform:scaleX(.2)}.steps{margin-top:0}.steps li{border:0}.steps li.done{color:var(--primary)}.lesson-pane{background:var(--paper)}.choice{font-size:15px}.choice:hover{border-color:var(--primary)}.notebook-meta{display:flex;gap:20px;flex-wrap:wrap;padding:0 0 23px;margin-bottom:27px;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}.notebook-meta a{margin-left:auto}.notebook-layout{display:grid;grid-template-columns:minmax(220px,280px) minmax(0,1fr);gap:35px}.note-index{min-width:0}.note-index h2{font-size:18px}.note-index .section-heading{align-items:center;margin-bottom:15px}.note-index .section-heading .text-button{margin-left:auto;font-size:13px}.note-filter{font-size:12px!important;margin-top:13px!important}.note-filter select{font-size:14px;padding:9px 10px}.note-list{margin-top:18px;border-top:1px solid var(--line)}.note-select{width:100%;display:flex;flex-direction:column;gap:8px;text-align:left;padding:18px 12px;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink);line-height:1.45}.note-select[aria-pressed=true]{background:var(--soft)}.note-select strong{font-size:15px;font-weight:600;overflow-wrap:anywhere}.note-topic,.note-stamp{font-size:11px;color:var(--muted)}.note-preview{font-size:12px;color:var(--muted);overflow-wrap:anywhere}.note-index .empty{font-size:13px;padding:24px 4px}.note-index .empty h3{font-size:15px}.note-paper{padding:27px 30px 24px;background:var(--paper);border:1px solid var(--line);border-radius:12px;min-width:0}.note-paper h2{font-size:20px}.note-paper .section-heading{align-items:center;margin:0}.note-paper .section-heading .fine{margin:0;font-size:11px}.note-paper label.field{font-size:13px}.note-paper .form-grid{gap:14px}.note-paper textarea{min-height:200px;background:transparent;line-height:1.75}.note-paper .actions{margin-top:20px}.note-paper .feedback:empty{display:none}.note-paper input,.note-paper textarea,.note-paper select{font-size:15px}.notebook-boundary{font-size:12px;color:var(--muted);padding-top:22px;margin-top:22px;border-top:1px solid var(--line);line-height:1.65}.revision-history{padding-top:20px;margin-top:20px;border-top:1px solid var(--line);font-size:13px}.revision-history summary{cursor:pointer;min-height:32px}.revision-history article{padding:15px 0;border-top:1px solid var(--line);margin-top:15px}.revision-history h3{font-size:14px;margin:7px 0}.preserve-lines{white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px}.notebook-portable{margin-top:34px;padding-top:25px;border-top:1px solid var(--line)}.notebook-portable h2{font-size:17px}.notebook-portable p{margin:10px 0;font-size:13px;color:var(--muted);max-width:90ch}.notebook-portable a{font-size:13px}.notebook-section{max-width:860px}.notebook-section input[type=text]{font-size:16px}.notebook-section h2{margin-bottom:15px}.topbar{background:var(--canvas)}
@media(max-width:1180px){.notebook-layout{grid-template-columns:230px minmax(0,1fr);gap:24px}.note-paper{padding:24px}.track-context{align-items:flex-start}.track-context .search-form{min-width:245px}.library-count{display:none}.page-tools{max-width:230px}.topbar-tools{gap:12px}.notebook-layout .form-grid{grid-template-columns:1fr;gap:0}}
@media(max-width:900px){.track-context{display:block}.track-context .search-form{max-width:none;margin-top:20px}.notebook-layout{grid-template-columns:1fr}.note-index .note-list{max-height:285px;overflow:auto}.note-select{padding-left:15px}.notebook-layout .form-grid{grid-template-columns:1fr 1fr;gap:15px}.page-top{display:block}.page-tools{max-width:none;justify-content:flex-start;padding:0;margin:0 0 23px}.topbar-tools{gap:11px}.topbar #save-status{padding:0;border:0}.topbar .backup-link{display:none}.topbar{height:auto;min-height:65px;padding-top:10px;padding-bottom:10px}.topbar-tools{flex-wrap:wrap;justify-content:flex-end;row-gap:0}.topbar-tools #save-status{width:100%;text-align:right}.shared-foundations,.capstone-link{align-items:flex-start;flex-direction:column;gap:15px}.session-tools{flex-direction:column;align-items:flex-end;gap:4px}.brand-icon{width:38px;height:38px}.brand{font-size:18px}}
@media(max-width:650px){h1{font-size:31px}.brand{font-size:21px;margin-bottom:18px}.brand-icon{width:44px;height:44px}.rail{padding-top:17px}.topbar{min-height:57px}.topbar-tools .text-button{min-height:28px;font-size:11px}.topbar #breadcrumb{max-width:45%;line-height:1.5}.topbar #save-status{font-size:10px}main{padding-top:28px}.next-session{padding:25px 22px}.next-session h2{font-size:28px}.page-kicker{font-size:12px;margin-bottom:10px}.filterbar{display:grid;grid-template-columns:1fr 1fr;gap:7px;padding-bottom:22px}.filterbar button{font-size:12px;min-height:49px;justify-content:space-between;text-align:left;padding:10px 11px}.filterbar .filter-count{font-size:11px}.track-context{padding-top:23px}.track-context h2{font-size:21px}.track-context p{font-size:14px}.track-context .search-form{min-width:0}.search-form input[type=search]{font-size:16px}.session-row{padding:20px 0;gap:13px}.session-row h3{font-size:16px}.session-row p{font-size:13px}.session-row .btn{font-size:13px;min-width:78px;padding:10px 12px}.row-type{display:none}.session-heading h1{font-size:27px}.session-tools .text-button{font-size:12px}.session-tools{max-width:100px}.session-heading .eyebrow{font-size:10px;margin-bottom:10px}.steps{margin-top:0;margin-bottom:24px}.steps li[aria-current=step]{font-size:14px;padding-top:11px}.progress-track{margin-top:24px}.note-paper{padding:22px 18px}.note-paper .section-heading{flex-direction:column;align-items:flex-start;gap:6px}.notebook-layout .form-grid{grid-template-columns:1fr;gap:0}.note-paper input,.note-paper textarea,.note-paper select{font-size:16px}.notebook-meta{gap:10px 20px;margin-bottom:22px;font-size:12px}.notebook-meta a{margin-left:0}.note-index .note-list{max-height:220px}.page-tools{gap:18px}.page-tools .btn{font-size:13px}.note-paper textarea{min-height:185px}.note-stamp,.note-topic{font-size:12px}.note-preview{font-size:13px}.note-paper .fine{font-size:12px}.note-paper .btn.primary{flex:1}.view-switch{gap:8px 16px}.footer{line-height:1.6}}

input,textarea,select{font-weight:400}.note-paper .field{font-weight:600}.note-paper .field input,.note-paper .field textarea,.note-paper .field select{font-weight:400}.session-tools{flex-wrap:wrap;max-width:300px}.session-tools .text-button{line-height:1.4;text-align:right}
@media(max-width:650px){.session-tools{max-width:105px}}

/* Palette controls stay visible on every route, with complete light and dark surfaces. */
.theme-control{display:flex;align-items:center;gap:8px;white-space:nowrap;font-size:12px}.theme-control select{margin:0;width:108px;font-size:12px;padding:8px 10px;min-height:36px;border-color:var(--line);border-radius:7px}.topbar-tools{gap:14px}.topbar{background:var(--canvas)}.btn.primary:hover:not(:disabled),.button-link.primary:hover{color:var(--on-primary)}.filterbar button[aria-pressed=true]{color:var(--on-primary)}.btn:disabled{opacity:.55}.rail nav a[aria-current=page]{color:var(--rail-selected-ink)}.rail .count{background:var(--rail-selected);color:var(--rail-selected-ink)}.skip{background:var(--paper)}.theme-control select:focus-visible{outline-offset:2px}
@media(max-width:1180px){.topbar{flex-wrap:wrap;padding-top:12px;padding-bottom:12px;height:auto;row-gap:7px}.topbar-tools{margin-left:auto}.topbar #save-status{border:0;padding:0}.topbar .backup-link{display:none}}
@media(max-width:900px){.topbar-tools #save-status{width:auto}.topbar #breadcrumb{font-size:11px}.topbar-tools{justify-content:flex-start}.theme-control select{width:100px}}
@media(max-width:650px){.rail nav{grid-template-columns:repeat(3,minmax(0,1fr))}.rail nav a,.rail nav a:nth-child(n+4){grid-column:auto}.topbar #breadcrumb{max-width:100%;width:100%}.topbar-tools{width:100%;justify-content:space-between;gap:9px;flex-wrap:wrap}.theme-control{font-size:11px;gap:5px}.theme-control select{width:97px;min-height:38px;font-size:12px}.topbar #save-status{font-size:10px}.topbar-tools .text-button{min-height:38px}.topbar{padding-bottom:12px}.rail nav a{font-size:11px}.brand{margin-bottom:15px}h1{font-size:29px}}

/* Complete selectable surfaces: every theme remaps the same semantic roles. */
:root[data-theme=violet]{--primary:#6942b5;--primary-hover:#553292;--on-primary:#fff;--accent:#6942b5;--ink:#2d2540;--muted:#625876;--canvas:#f1eef8;--paper:#fdfcff;--line:#d8d1e8;--soft:#e9e3f6;--error:#9f323b;--error-bg:#fff0f1;--rail-bg:#32254f;--rail-text:#e9ddff;--rail-muted:#cdbde8;--rail-hover:#46356a;--rail-selected:#ebe1ff;--rail-selected-ink:#4a257f;--focus-outline:#a65d16;--input-line:#9689ac}
:root[data-theme=rose]{--primary:#a43c5b;--primary-hover:#842c48;--on-primary:#fff;--accent:#a43c5b;--ink:#402831;--muted:#755963;--canvas:#f8eef1;--paper:#fffafb;--line:#ead1d9;--soft:#f6e3e9;--error:#9d3036;--error-bg:#fff0f1;--rail-bg:#572a3a;--rail-text:#ffe4ed;--rail-muted:#ebbdca;--rail-hover:#73384d;--rail-selected:#ffe0e9;--rail-selected-ink:#7b2441;--focus-outline:#875e12;--input-line:#b88e9b}
:root[data-theme=graphite]{--primary:#273b57;--primary-hover:#1c2d45;--on-primary:#fff;--accent:#273b57;--ink:#222a33;--muted:#5c6672;--canvas:#eef0f2;--paper:#fdfdfd;--line:#d2d7dd;--soft:#e1e6eb;--error:#9c352f;--error-bg:#fff0ed;--rail-bg:#1d252e;--rail-text:#e0e5eb;--rail-muted:#bfc8d1;--rail-hover:#313d49;--rail-selected:#dce4ec;--rail-selected-ink:#25394f;--focus-outline:#95630f;--input-line:#8a96a3}

/* The rail collapses in flow; its controlled links are removed from sight and the tab order. */
:root{--rail-width:238px}
:root[data-rail=collapsed]{--rail-width:72px}
.shell{grid-template-columns:var(--rail-width) minmax(0,1fr)}
.rail-top{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}
.rail-top .brand{flex:1;min-width:0;margin:0 0 30px}
.rail-toggle-text{display:none}.rail-toggle{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-width:44px;min-height:44px;padding:8px;border:1px solid transparent;border-radius:8px;background:transparent;color:var(--rail-text);font:600 11px "Avenir Next",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;white-space:nowrap}
.rail-toggle:hover{background:var(--rail-hover)}
.rail-toggle:focus-visible{outline:3px solid var(--focus-outline);outline-offset:3px}
.rail-toggle>span:first-child{font-size:17px;line-height:1}
:root[data-rail=collapsed] .rail{padding:20px 12px 18px}
:root[data-rail=collapsed] .rail-top{flex-direction:column;align-items:center;justify-content:center}
:root[data-rail=collapsed] .rail-top .brand{flex:none;width:48px;justify-content:center;margin:0}
:root[data-rail=collapsed] .brand-copy,:root[data-rail=collapsed] .rail-toggle-text,:root[data-rail=collapsed] .rail nav,:root[data-rail=collapsed] .rail-foot{display:none}
:root[data-rail=collapsed] .rail-toggle{margin-top:18px}
:root[data-rail=collapsed] #focus-dock{left:calc(var(--rail-width) + 48px)}
@media(min-width:901px){:root[data-rail=collapsed] main{max-width:none}}
@media(max-width:900px){:root[data-rail=collapsed] #focus-dock{left:calc(var(--rail-width) + 25px)}}
@media(max-width:650px){.rail-top .brand{margin-bottom:15px}.rail-toggle{min-height:38px;font-size:11px}:root[data-rail=collapsed] .rail{padding:13px 18px 12px}:root[data-rail=collapsed] .rail-top{flex-direction:row;justify-content:space-between}:root[data-rail=collapsed] .rail-toggle{margin-top:0}:root[data-rail=collapsed] #focus-dock{left:12px;right:12px}}

.pack-current h2{max-width:30ch}.pack-current h2,.pack-preview h3,.session-row h3,.lesson-pane p,.intro{overflow-wrap:anywhere}.pack-preview{margin-top:22px}.pack-preview ul{line-height:1.8;padding-left:22px}