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@media(max-width:480px){.shell{width:calc(100% - 28px)}.header-inner{flex-wrap:wrap;padding:15px 0 0;gap:7px}.brand-mark{width:35px;height:42px}.brand-sub{font-size:10px}.brand strong{font-size:15px}nav{width:100%;justify-content:space-between;gap:20px}nav a{min-height:42px;font-size:12px;padding:0 4px}.hero{padding:31px 0 22px}.hero h1{font-size:2.65rem;margin-bottom:18px}.hero .eyebrow{font-size:9px;letter-spacing:.065em;line-height:1.7;margin-bottom:16px}.hero .lead{font-size:14px;line-height:1.8}.section-head{margin-top:11px}.section-head h2{font-size:18px}.modes{grid-template-columns:1fr;gap:9px}.mode{padding:15px 17px;min-height:112px}.mode-meta{display:flex;margin-bottom:6px;font-size:9px}.mode>strong{font-size:17px;margin-bottom:3px}.mode-desc{font-size:12px}.mode-arrow{display:block;bottom:17px;right:17px;font-size:18px}.mode-desc{max-width:90%}.topic-grid{grid-template-columns:1fr}.topic-option,.topic-option:last-child{grid-column:auto;min-height:85px}.topic-option strong{font-size:13px}.topic-option small{font-size:11px}.level-switch button{padding:12px;font-size:12px}.level-switch small{font-size:10px}.start-row{flex-direction:column;align-items:stretch;text-align:center}.start-row .primary{min-height:49px}.learning-note ol{grid-template-columns:1fr;gap:0}.learning-note li{margin-bottom:19px}.learning-note li span{font-size:12px}.resume{flex-wrap:wrap;gap:10px}.resume>div{flex-basis:100%}.mode-description{padding:22px}.mode-description h2{font-size:24px}.round-heading .text-button{font-size:11px}.round-heading .eyebrow{font-size:10px}.task-panel{padding:21px 18px;border-radius:12px}.task-panel h1{font-size:1.4rem;margin-bottom:19px}.task-kicker{font-size:9px}.stem{font-size:15px;line-height:1.85}.answer-fields{grid-template-columns:1fr;gap:19px}.answer-field label:not(.choice),.answer-field legend{font-size:13px}.choice{padding:12px;font-size:13px}.task-actions .primary,.task-actions .secondary{flex:1;min-height:48px;font-size:12px;padding:10px 12px}.hint-area{padding:6px 14px}.hint-area p{font-size:12px}.solution ol{font-size:13px;padding-left:18px}.graph{padding:6px;margin:18px 0 23px}.graph-candidates>div{display:block}.graph-candidates>div>strong{margin-bottom:5px}.graph-candidates svg{max-height:250px}.task-footer .secondary{font-size:12px}.page-heading h1{font-size:2.4rem}.summary-banner{gap:24px;padding:19px}.summary-banner strong{font-size:25px}.summary-row{grid-template-columns:1fr 88px;gap:12px}.summary-row>div:first-child{gap:8px}.summary-row strong{font-size:12px}.summary-count{font-size:10px}.status{font-size:10px}.next-focus{padding:23px}.next-focus h2{font-size:24px}.info-card{padding:22px}.info-card h2{font-size:17px}.task-nav{gap:4px}.task-nav button{min-width:0;padding:9px 5px;gap:2px}.task-nav button>span:first-child{font-size:11px}.task-nav .nav-check{font-size:9px}.brand-sub span{padding:0 3px}}
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