.learning-shell .level-switch{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 24px}.learning-shell .level-switch a{border:1px solid var(--border);border-radius:8px;min-height:42px;padding:7px 14px;font-size:15px;color:var(--muted);background:white}.learning-shell .level-switch a[aria-current=page]{color:var(--purple);border-color:#d6bef4;background:var(--lavender);font-weight:700}.learning-shell .topic-card[hidden]{display:none}.learning-shell .reading-column article[data-current]{display:block!important}.learning-shell .reading-column article[hidden]{display:none!important}.learning-shell .reading-column article>.breadcrumb,.learning-shell .reading-column article>.grade-switch,.learning-shell .reading-column article>.on-page{display:none!important}.learning-shell .reading-column article>.hero{margin:0!important;border:0!important}.learning-shell .reading-column article>.hero h1{font-size:40px!important;line-height:1.2!important}.learning-shell .reading-column article>.hero p{font-size:18px!important;line-height:1.7!important;color:var(--muted)!important;max-width:100%!important}.learning-shell .reading-column .guide-section[hidden]{display:none!important}.learning-shell .reading-column .guide-section,.learning-shell .reading-column .section-heading{max-width:100%;min-width:0}.learning-shell .reading-column .guide-section h2{font-size:28px!important;line-height:1.25!important}.learning-shell .reading-column .keyword-section dl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.learning-shell .reading-column .keyword-section dl>div{padding:15px;border-radius:10px;background:var(--lavender)}.learning-shell .reading-column .keyword-section dt{font-size:17px;font-weight:700}.learning-shell .reading-column .keyword-section dd{margin:6px 0 0;font-size:16px;line-height:1.6;color:var(--muted)}.learning-shell .reading-column button,.learning-shell .reading-column select,.learning-shell .reading-column input{max-width:100%;min-height:44px;font-size:16px!important}.learning-shell .reading-column button{white-space:normal}.learning-shell .reading-column img,.learning-shell .reading-column svg{max-width:100%}.learning-shell .reading-column svg text{letter-spacing:normal}.learning-shell .reading-column [class*="scroll"]{max-width:100%;overflow-x:auto}.learning-shell .reading-column table{max-width:100%}.learning-shell .reading-column .on-page{display:none}.learning-shell .reading-column .standalone-sheet{display:none!important}.learning-shell .reading-column .p3-reference,.learning-shell .reading-column .p3-activity{max-width:100%;min-width:0}.learning-shell .reading-column .section-heading{display:block}.learning-shell .reading-column .section-heading h2{margin:16px 0}.learning-shell .topic-rail nav a{font-size:14px;line-height:1.45}.learning-shell .reading-column .guide-section .guide-section{display:block!important}.learning-shell .hub-footer{clear:both}.learning-shell .added-levels{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:18px 0 36px}.learning-shell .added-level{display:flex;align-items:flex-start;gap:18px;padding:24px;border:1px solid var(--border);border-radius:14px;background:white;transition:border-color .2s}.learning-shell .added-level:hover{border-color:var(--purple)}.learning-shell .added-level .level-number{font-size:24px;padding:8px 12px}.learning-shell .added-level h2{margin:0 0 8px;font-size:23px}.learning-shell .added-level p{font-size:16px;margin:0 0 7px;line-height:1.5}.learning-shell .added-level div>span{font-size:14px;color:var(--purple)}.learning-shell .added-level>svg{margin-left:auto;color:var(--purple)}.learning-shell .reading-column [class*="model"],.learning-shell .reading-column [class*="panel"],.learning-shell .reading-column [class*="activity"]{min-width:0}@media(max-width:1100px){.learning-shell .reading-column article>.hero{padding-bottom:24px!important}.learning-shell .reader-layout{grid-template-columns:190px minmax(0,1fr)}}@media(max-width:760px){.learning-shell .level-switch{gap:6px}.learning-shell .level-switch a{font-size:14px;padding:7px 10px}.learning-shell .reading-column article>.hero h1{font-size:34px!important}.learning-shell .reading-column .guide-section h2{font-size:26px!important}.learning-shell .reading-column .keyword-section dl{grid-template-columns:1fr}.learning-shell .reading-column .guide-section{overflow-wrap:anywhere}.learning-shell .reading-column .p3-reference,.learning-shell .reading-column .p3-activity{padding:14px!important}.learning-shell .reading-column .section-heading{display:block}.learning-shell .added-levels{grid-template-columns:1fr}.learning-shell .added-level{padding:20px}.learning-shell .reading-column [class*="actions"],.learning-shell .reading-column [class*="controls"],.learning-shell .reading-column [class*="tabs"]{flex-wrap:wrap}.learning-shell :where(.reading-column [class*="activity"])>svg{min-width:0;width:100%}.learning-shell .reading-column table td,.learning-shell .reading-column table th{padding:8px;font-size:14px}.learning-shell .reading-column .p3-intro-grid,.learning-shell .reading-column .p3-reference-grid{grid-template-columns:1fr}}.learning-shell .added-level:last-child:nth-child(odd){grid-column:1/-1}.learning-shell .hub-tools-section{margin:42px 0}.learning-shell .hub-tools-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.learning-shell .hub-tools-grid>a{display:flex;flex-direction:column;padding:24px;border:1px solid var(--border);border-radius:14px;background:white}.learning-shell .hub-tools-grid>a:hover{border-color:var(--purple)}.learning-shell .hub-tools-grid h3{font-size:23px;margin:0 0 12px}.learning-shell .hub-tools-grid p{font-size:17px;margin:0 0 20px;line-height:1.65}.learning-shell .hub-tools-grid span{display:flex;align-items:center;gap:8px;font-size:15px;color:var(--purple);font-weight:700;margin-top:auto}.learning-shell .all-tools-link{display:inline-flex;align-items:center;gap:8px;font-size:16px;color:var(--purple);margin-top:20px}@media(max-width:850px){.learning-shell .hub-tools-grid{grid-template-columns:1fr}}/* Shared topic navigation: decorative icons never replace the topic name. */.learning-shell .topic-rail nav a>.topic-icon,.learning-shell .topic-rail nav a>svg,.learning-shell .topic-rail nav a>.symbol{width:26px;height:26px;flex:0 0 26px;align-self:center}.learning-shell .topic-rail nav a>.symbol{font-size:16px;text-align:center;display:grid;place-items:center}.learning-shell .topic-rail .topic-nav-label{min-width:0;overflow-wrap:normal}