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minmax(0,1fr)}.study-rail{display:none}}@media (width<=860px){.topbar{grid-template-columns:38px 1fr 1fr;gap:15px;padding:0 16px}.mobile-nav-button{display:block}.header-progress{display:none}.workspace{display:block}.sidebar{z-index:40;width:284px;transition:left .25s;position:fixed;top:76px;bottom:0;left:-295px;overflow-y:auto;box-shadow:12px 0 30px #00000024}.sidebar.open{left:0}.lesson-hero{grid-template-columns:1fr}.hero-visual{max-width:560px}}@media (width<=620px){.topbar{height:auto;min-height:76px}.brand b{font-size:14px}.brand small{display:none}.search-wrap input{font-size:12px}.lesson-hero,.content-section{padding-left:20px;padding-right:20px}.lesson-hero{min-height:0;padding-top:40px;padding-bottom:42px}.hero-copy h1{font-size:36px}.hero-copy>p{font-size:14px}.concept-visual,.formula-poster{height:220px;box-shadow:12px 14px 0 color-mix(in srgb, var(--accent) 22%, #efeadf)}.goal-grid{grid-template-columns:1fr}.knowledge-card{grid-template-columns:1fr;gap:5px;padding:21px}.formula-box,.pitfall{flex-direction:column;align-items:flex-start;gap:8px}.answer-box{grid-template-columns:1fr}.lesson-footer{flex-direction:column;align-items:flex-start;gap:20px;padding-left:20px;padding-right:20px}.lesson-footer button{width:100%}.state-node{width:62px;height:62px}.state-node.n1{left:calc(50% - 31px)}.state-arrow.a01{left:29%}.state-arrow.a12{right:27%}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important}}