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(max-width:900px){.quick-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:1fr}.lesson-tools{grid-template-columns:repeat(2,minmax(0,1fr));position:static}.admin-shell{grid-template-columns:1fr}.admin-sidebar{height:auto;position:static}.admin-nav{grid-template-columns:repeat(5,minmax(0,1fr));overflow-x:auto}.admin-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-simple-grid{grid-template-columns:1fr}}@media (max-width:720px){.container-shell{width:min(100% - 1.25rem,1160px)}.desktop-nav{display:none}.mobile-nav{display:block}.mobile-nav summary{cursor:pointer;border:1px solid #cdd1d5;border-radius:.8rem;place-items:center;width:2.75rem;height:2.75rem;list-style:none;display:grid}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-nav-menu{width:min(18rem,100vw - 1.3rem);box-shadow:var(--shadow);background:#fff;border:1px solid #d7d9d8;border-radius:1rem;gap:.25rem;padding:.6rem;display:grid;position:absolute;top:4.5rem;right:.65rem}.hero-grid{grid-template-columns:1fr}.hero-note{max-width:32rem;transform:none}.class-grid,.lesson-grid,.simple-section-grid{grid-template-columns:1fr}.simple-section-card{min-height:8rem}.quick-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid,.form-grid{grid-template-columns:1fr}.form-field--full{grid-column:auto}.admin-grid{grid-template-columns:1fr}.admin-nav{grid-template-columns:repeat(2,minmax(8rem,1fr))}.data-row{grid-template-columns:1fr}}@media (max-width:430px){.brand-name span{font-size:.85rem}.brand-name small{font-size:.56rem}.search-form{display:grid}.search-form label{min-height:2.7rem}.quick-grid{grid-template-columns:1fr}.section-heading,.footer-bottom,.admin-topbar{flex-direction:column;align-items:flex-start}.lesson-tools{grid-template-columns:1fr}.chapter-row{grid-template-columns:auto 1fr}.chapter-row>:last-child{grid-column:2}.motivation{grid-template-columns:1fr}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media print{body{color:#000;background:#fff;font-size:11pt}.site-header,.site-footer,.lesson-tools,.no-print,.quiz button{display:none!important}.container-shell{width:100%}.page-hero{padding:0 0 1rem}.content-block,.quiz{break-inside:avoid;box-shadow:none;color:#000;background:#fff;border-color:#bbb}a{text-decoration:none}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}