.cs-plan-note{margin:0 0 1.4rem;color:var(--muted,#b8bdc8);max-width:70rem;line-height:1.6}
.cs-plan-field{margin:1.1rem 0 1.7rem}.cs-plan-field>.field{margin-bottom:.45rem}.cs-plan-field>button{font-size:.85rem;padding:.4rem .7rem}.cs-field-note{border-left:3px solid #bba4fa;padding:.2rem 1rem 1rem;margin-top:.75rem;background:#222735;border-radius:0 8px 8px 0}.cs-field-note textarea.long{min-height:85px}.cs-field-note small{font-weight:400;line-height:1.5}.cs-save button:disabled{opacity:.6;cursor:wait}
.cs-plan-layout{display:grid;grid-template-columns:minmax(220px,300px) minmax(0,1fr);gap:2rem;align-items:start}
.cs-plan-outline{display:flex;flex-direction:column;gap:1rem;max-height:75vh;overflow:auto;padding-right:.5rem}
.cs-plan-outline button{text-align:left;width:100%;white-space:normal;line-height:1.4}
.cs-plan-section{display:flex;flex-direction:column;gap:.3rem;border-top:1px solid #353a46;padding-top:.8rem}
.cs-plan-section>button:first-child{font-weight:600}
.cs-plan-section>button:not(:first-child){padding-left:1.4rem;font-size:.92rem}
.cs-plan-detail{min-width:0;max-width:960px;padding:1.4rem;border:1px solid #353a46;border-radius:16px;background:#161b25}
.cs-plan-detail h2{margin:0 0 1.4rem}.cs-plan-detail .field{margin:1rem 0}
.cs-plan-detail textarea.long{min-height:110px;resize:vertical;line-height:1.6}
.cs-plan-tabs{display:flex;gap:.45rem;flex-wrap:wrap;margin:1.2rem 0}
.cs-plan-children{display:flex;flex-direction:column;gap:.45rem;margin:2rem 0}
.cs-plan-children button{text-align:left;white-space:normal}.cs-instructions{max-width:850px}.cs-instructions details{margin:1rem 0;padding:1rem;border:1px solid #424855;border-radius:10px}.cs-instructions p{line-height:1.6}
@media(max-width:760px){.cs-plan-layout{grid-template-columns:1fr;gap:1rem}.cs-plan-outline{max-height:280px}.cs-plan-detail{padding:1rem}.cs-plan-tabs button{flex:1 1 110px}.cs-plan-detail textarea.long{min-height:160px}}
.cs-plan-update{padding:1rem 1.25rem;margin:1rem 0;border:1px solid var(--line,#d5d0c6);border-radius:12px;background:var(--surface,#1b2030)}
.cs-plan-update h2{margin-top:0;font-size:1.15rem}.cs-plan-update details{margin:.75rem 0;max-height:24rem;overflow:auto}.cs-update-change{padding:.75rem 0;border-bottom:1px solid var(--line,#d5d0c6)}.cs-update-change p{white-space:pre-wrap;overflow-wrap:anywhere}
/* D-130: one persistent student page beside compact contextual controls. */
.cs-plan-workspace,.cs-live-workspace{max-width:none;padding:20px 28px 32px}
.cs-plan-workspace .cs-header h1,.cs-live-workspace .cs-header h1{font-size:24px;letter-spacing:-.4px}
.cs-plan-workspace .cs-plan-layout,.cs-live-workspace .cs-plan-layout{grid-template-columns:minmax(290px,30%) minmax(0,1fr);gap:24px}
.cs-plan-detail,.cs-lesson-editor{max-height:calc(100vh - 110px);overflow:auto;min-width:0;padding:16px;scrollbar-gutter:stable}
.cs-plan-detail{max-width:none}.cs-lesson-editor{background:#161b25;border:1px solid #353a46;border-radius:16px}
.cs-plan-picker{padding:8px 0 16px;border-bottom:1px solid #353a46;margin-bottom:16px}
.cs-plan-picker summary,.cs-plan-children summary,.cs-plan-tools summary{cursor:pointer;font-weight:600;font-size:14px}
.cs-plan-picker .cs-plan-outline{max-height:45vh;margin-top:14px}.cs-plan-detail .cs-plan-field{margin:12px 0}.cs-plan-tabs{gap:4px;margin:12px 0}.cs-plan-tabs button{font-size:13px;padding:8px 10px}.cs-plan-detail textarea.long{min-height:90px;max-height:35vh}.cs-plan-detail h2{font-size:20px}
.cs-plan-preview{min-width:0;position:sticky;top:20px;border:1px solid #404650;border-radius:16px;overflow:hidden;background:#f4efe4;color:#26221b;max-height:calc(100vh - 105px);overflow-y:auto;color-scheme:light;--ink:#26221b;--muted:#5a5346;--paper:#f4efe4;--surface:#fbf8f1;--line:#ded5c0;--green:#0c4e54;--soft:#f3e9d2;--error:#a03332;--success:#e3eee5}
.cs-preview-top{display:flex;align-items:center;gap:12px;justify-content:space-between;padding:12px 20px;background:#222735;color:#e9edf2;font-size:13px}.cs-preview-top span{color:#bcc4d0}.cs-preview-top button{color:inherit;background:transparent}
.cs-preview-ribbon{display:flex;gap:8px;padding:12px 20px;overflow-x:auto;border-bottom:1px solid #d7d9cd;white-space:nowrap}.cs-preview-ribbon button{flex-shrink:0;font-size:13px}
.reader-overview{padding:30px clamp(20px,4vw,64px);min-height:420px;overflow-wrap:anywhere}.reader-overview h1{font-size:clamp(25px,3vw,40px);line-height:1.2;margin:32px 0 20px}.reader-overview h2{font-size:24px}.reader-breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-size:13px}.reader-breadcrumbs button{border:0;background:none;color:inherit;padding:3px;text-align:left;font-size:13px}.reader-overview-contents{display:flex;flex-direction:column;gap:6px;margin-top:28px}.reader-overview-contents button{text-align:left}.cs-preview-empty{padding:0 30px 24px;color:#646a60;font-size:14px}.reader-overview .reader-text,.reader-overview .reader-teaching{font-size:18px;line-height:1.7;white-space:pre-wrap}
.cs-live-workspace .cs-cascade{padding-top:14px}.cs-live-workspace .cs-form{padding:0;border:0;background:transparent}.cs-live-workspace .cs-selected{margin:8px 0}.cs-live-workspace .cs-selected h2{font-size:20px}.cs-live-workspace .cs-section{margin:8px 0}.cs-live-workspace .cs-section-body{padding:12px 0}.cs-live-workspace .cs-section summary{font-size:15px}.cs-live-workspace .studio-grid{display:block}.cs-live-workspace .cs-header{align-items:center}.cs-live-workspace .cs-save{font-size:13px}.cs-live-workspace textarea{max-width:100%}.cs-map{max-width:800px}.cs-map details{margin:12px 0}.cs-map button{display:block;text-align:left;margin:8px 0}.cs-plan-tools{margin-top:20px}.cs-plan-tools>button{margin-top:12px}.cs-plan-update{padding:10px;font-size:13px}
@media(max-width:800px){.cs-plan-workspace,.cs-live-workspace{padding:12px}.cs-plan-workspace .cs-plan-layout,.cs-live-workspace .cs-plan-layout{display:flex;flex-direction:column;gap:16px}.cs-plan-preview{position:static;order:-1;width:100%;max-height:52vh}.cs-plan-detail,.cs-lesson-editor{width:100%;box-sizing:border-box;max-height:none}.cs-header{flex-direction:column;gap:8px}.reader-overview{min-height:220px;padding:18px}.reader-overview h1{margin:18px 0}.cs-preview-top{flex-wrap:wrap}.cs-plan-tabs button{flex:0 1 auto}}
.cs-live-workspace .build-grid,.cs-live-workspace .grid-two{display:block}.cs-live-workspace .build-grid>.item-list{max-height:220px;overflow:auto}.cs-live-workspace .reader-layout{display:block}.cs-live-workspace .reader-question-panel{min-width:0}.cs-live-workspace .cs-form .field{margin:12px 0}.cs-live-workspace .cs-form textarea{min-height:90px}.cs-live-workspace .cs-form .build-grid{gap:12px}
.cs-plan-preview .cs-preview-top button{color:#e9edf2}

/* Compact workspace shared by plans and lessons. */
.cs-workspace.cs-plan-workspace,.cs-workspace.cs-live-workspace{padding:16px 24px 24px;max-width:1800px}
.cs-header{align-items:center;gap:16px;min-height:48px}.cs-header h1{font-size:20px!important;letter-spacing:-.3px}.cs-location{display:block;font-size:12px;color:var(--muted);max-width:60ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cs-save{padding:0;flex-wrap:nowrap}.cs-save>button{white-space:nowrap}.cs-menu{position:relative;order:3}.cs-menu>summary{cursor:pointer;padding:10px;border:1px solid var(--line);border-radius:6px;list-style:none}.cs-menu[open]{z-index:10}.cs-menu[open]>button{display:block;min-width:180px;width:100%;text-align:left;background:var(--surface)!important}.cs-menu[open]{background:var(--surface);border:1px solid var(--line);border-radius:6px}.cs-plan-workspace .cs-plan-layout,.cs-live-workspace .cs-plan-layout{grid-template-columns:minmax(320px,1fr) minmax(0,2fr);gap:20px}.cs-plan-detail,.cs-lesson-editor{max-height:calc(100dvh - 105px);border-radius:10px;padding:16px;background:#1b2029}.cs-plan-preview{top:16px;max-height:calc(100dvh - 105px);border-radius:10px}.cs-plan-picker{padding:0 0 12px;margin-bottom:12px}.cs-tree{max-height:29vh;overflow:auto;margin-top:12px}.cs-tree-row{display:flex;align-items:center;padding-left:calc(var(--depth)*12px);min-width:0}.cs-tree-toggle,.cs-tree-spacer{flex:0 0 30px;width:30px;height:36px}.cs-tree-toggle{padding:3px!important}.cs-tree-name{flex:1;min-width:0;text-align:left;padding:8px!important;font-size:13px;line-height:1.35;white-space:normal;overflow-wrap:anywhere}.cs-tree-name.selected{background:#35465b!important;box-shadow:inset 3px 0 #abc3e1;color:#fff!important}.cs-mobile-tabs{display:none}.cs-stage-footer{position:sticky;bottom:-16px;background:#1b2029;border-top:1px solid var(--line);padding:14px 0 6px;margin-top:20px}.cs-stage-footer>button{width:100%;white-space:normal}.cs-stage-footer .cs-note{font-size:12px;margin:8px 0}.cs-plan-detail .field,.cs-form .field{font-size:14px!important}.cs-plan-detail input,.cs-plan-detail textarea,.cs-form input,.cs-form textarea{font-size:15px!important;padding:10px!important}.cs-plan-tools{border-top:1px solid var(--line);padding-top:12px}.cs-selected>span{font-size:12px}.cs-selected h2{font-size:18px!important}.cs-plan-tabs{border-bottom:1px solid var(--line);padding-bottom:12px}.cs-section{border:0;background:none}.cs-section>summary{padding:10px 0;min-height:40px}.cs-form .panel{padding:12px}.cs-tree-toggle:focus-visible,.cs-tree-name:focus-visible{outline-offset:-2px}.cs-save .cs-note{font-size:12px}
@media(max-width:800px){
 .cs-workspace.cs-plan-workspace,.cs-workspace.cs-live-workspace{padding:12px}
 .cs-header{flex-direction:row;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:12px}.cs-header>div:first-child{flex:1;min-width:0}.cs-header h1{font-size:18px!important}.cs-location{max-width:42vw}.cs-save{max-width:none;gap:4px;justify-content:flex-end}.cs-save>button{padding:8px;font-size:13px}.cs-save .cs-note{max-width:60px;line-height:1.25}.cs-menu>summary{font-size:13px;padding:8px}.cs-menu[open]{position:absolute;right:12px;top:12px}
 .cs-mobile-tabs{display:flex;gap:4px;margin:0 0 12px;padding:4px;background:#232a35;border-radius:8px}.cs-mobile-tabs button{flex:1;padding:10px;border:0;background:transparent}.cs-mobile-tabs button[aria-pressed=true]{background:#40566d;color:#fff}
 .cs-plan-workspace .cs-plan-layout,.cs-live-workspace .cs-plan-layout{display:block}
 .cs-plan-layout[data-pane=edit]>.cs-plan-preview{display:none}
 .cs-plan-layout[data-pane=preview]>.cs-plan-detail,.cs-plan-layout[data-pane=preview]>.cs-lesson-editor{display:none}
 .cs-plan-preview{position:static;max-height:none;overflow:visible;width:100%;order:0}.cs-plan-detail,.cs-lesson-editor{max-height:none;padding:14px;width:100%}.cs-tree{max-height:32vh}.cs-stage-footer{position:static}.cs-preview-top{padding:10px 12px}.cs-preview-ribbon{padding:10px 12px}.reader-overview{padding:18px}.cs-plan-preview .reader-layout{display:block}
}
.cs-tree-name{justify-content:flex-start}.cs-selected h2{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.cs-selected{margin-bottom:0}.cs-lesson-editor>.cs-plan-picker{margin-bottom:10px}.reader-quick-check{margin:20px 0;padding:16px;border:1px solid var(--line);border-radius:10px}.reader-quick-check h2{font-size:20px}.reader-quick-choices{display:flex;flex-direction:column;gap:8px}.reader-quick-choices button{text-align:left;justify-content:flex-start;white-space:normal}