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(max-width: 800px){.hardware-page{--hardware-scene-height: clamp(180px, 32svh, 280px)}.hardware-world{bottom:auto;height:var(--hardware-scene-height);z-index:2;background:var(--bg)}.hardware-world:after{content:"";position:absolute;top:100%;width:100%;height:20px;background:linear-gradient(var(--bg),transparent);pointer-events:none}.hardware-view--tour .hardware-loading{right:0}.hardware-view--tour .hardware-scene-mount{-webkit-mask-image:none;mask-image:none}.hardware-story__section{min-height:calc(100svh - var(--navbar-height));padding:calc(var(--hardware-scene-height) + 24px) var(--spacing-5) 100px;align-items:flex-start}.hardware-story__content{width:100%;max-width:560px;padding:24px;margin-inline:auto}.hardware-story__hero .hardware-story__content{padding-block:24px}.hardware-back{margin-bottom:12px}.hardware-story h1{font-size:clamp(36px,7.5vw,52px)}.hardware-story h2{font-size:28px}.hardware-hero__meta{margin-top:22px}.hardware-lab-link{top:calc(var(--navbar-height) + 8px);left:var(--spacing-5);font-size:9px;gap:8px;padding:6px 10px}html.hardware-story-active{scroll-padding-top:var(--navbar-height)}.hardware-view:not(.hardware-view--tour) .hardware-scene-mount{bottom:62px}.hardware-tour__nav{bottom:12px;max-width:calc(100vw - 20px);width:560px;justify-content:space-between;gap:0;padding:5px;overflow-x:auto;scrollbar-width:none}.hardware-tour__nav :is(button,a){flex-shrink:0;padding:10px 5px;font-size:9px}.hardware-tour__nav :is(button,a) span{display:none}.hardware-pin button{font-size:8px;padding:7px 8px;top:-10px;max-width:calc(50vw - 44px);width:max-content;white-space:normal}.hardware-card{grid-template-columns:160px 1fr;padding:20px;gap:20px}.hardware-card__footer{flex-wrap:wrap;gap:12px}}@media (max-width: 520px){.hardware-card{grid-template-columns:1fr;gap:6px}.hardware-view--preview{height:190px}.hardware-card .skill-card__title{font-size:23px}.hardware-story__content{padding:20px}.hardware-chapter__heading{gap:8px}.hardware-view:not(.hardware-view--tour):not(.hardware-view--preview){height:320px}}.hardware-topic-start{display:inline-flex;align-items:center;min-height:44px;color:var(--acc2);font-size:12px;white-space:nowrap}.hardware-topic-start:hover{text-decoration:underline}.activity-page{display:grid;grid-template-columns:76px 1fr;height:100vh;overflow:hidden;background:var(--bg)}.activity-rail{display:flex;flex-direction:column;align-items:center;gap:22px;padding:22px 0;background:var(--bg2);border-right:1px solid var(--line)}.activity-rail__back{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-md);border:1px solid var(--line);color:var(--tx2);transition:background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast)}.activity-rail__back:hover{background:var(--surf2);border-color:var(--acc);color:var(--tx)}.activity-main{display:flex;flex-direction:column;min-width:0;min-height:0;height:100%}.activity-rail{overflow-y:auto}.activity-topbar{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-6);flex-wrap:wrap;padding:var(--spacing-5) var(--spacing-8);border-bottom:1px solid var(--line)}.activity-topbar__meta{display:flex;align-items:center;gap:var(--spacing-3);font-size:.8125rem;color:var(--tx3);white-space:nowrap}.activity-topbar__time{font-family:var(--font-mono)}.activity-topbar__rule{width:1px;height:16px;background:var(--line)}.activity-main>.seg-tabs{display:none;margin:var(--spacing-4) var(--spacing-8) 0}.activity-content{flex:1;display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-6);padding:26px var(--spacing-8);min-height:0}.activity-content[data-apply-type=bloch]{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}.activity-read,.activity-apply{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius-xl);background:var(--surf);min-width:0;overflow:hidden}.activity-apply{border-color:var(--accline)}.activity-read__inner,.activity-apply__inner{display:flex;flex-direction:column;gap:var(--spacing-5);padding:28px 30px;min-height:0;flex:1;overflow-y:auto}.activity-read__tab,.activity-apply__tab{display:flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:var(--text-xs);font-weight:var(--font-semibold);letter-spacing:.16em;color:var(--acc)}.activity-apply__tab{color:var(--warn)}.activity-apply__type{margin-left:auto;font-weight:var(--font-normal);letter-spacing:normal;color:var(--tx3)}.activity-read__content{display:flex;flex-direction:column;gap:var(--spacing-5)}.activity-read__title{margin:0;font-size:2.125rem;line-height:1.15;letter-spacing:-.02em}.activity-read__text{margin:0;max-width:var(--measure);font-size:var(--text-base);line-height:var(--leading-prose);color:var(--tx2);text-wrap:pretty}.activity-read__text em{color:var(--tx);font-style:italic}.activity-read__image{margin:0;display:flex;flex-direction:column;gap:9px}.activity-read__image img,.activity-read__lottie{width:100%;border-radius:var(--radius-lg);background:var(--inset);border:1px solid var(--line);padding:var(--spacing-3)}.activity-read__caption{margin:0;font-size:.8125rem;line-height:1.5;color:var(--tx3)}.activity-apply__content{display:flex;flex-direction:column;gap:var(--spacing-4);flex:1;min-height:0}.activity-apply__instruction{margin:0;font-size:var(--text-base);line-height:1.65;color:var(--tx);text-wrap:pretty}@media (max-width: 1024px){.activity-page{height:auto;min-height:100vh;overflow:visible}.activity-main{height:auto;min-height:0}.activity-read__inner,.activity-apply__inner{overflow-y:visible}.activity-content,.activity-content[data-apply-type=bloch]{grid-template-columns:1fr}.activity-main>.seg-tabs{display:inline-flex}.activity-read,.activity-apply{display:none}.activity-read.active,.activity-apply.active{display:flex}}@media (max-width: 720px){.activity-page{grid-template-columns:56px 1fr}.activity-topbar,.activity-content{padding-inline:var(--spacing-5)}.activity-main>.seg-tabs{margin-inline:var(--spacing-5)}.footer-nav{padding-inline:var(--spacing-5)}.activity-read__inner,.activity-apply__inner{padding:var(--spacing-5)}.activity-read__title{font-size:1.75rem}.footer-nav .segments{display:none}}.activity-apply__exercise{display:flex;flex-direction:column;gap:1.5rem}.activity-apply__dropzones{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}.dropzone{background:transparent;display:flex;flex-direction:column;align-items:center}.dropzone__drop-area{width:100%;min-height:80px;border:2px dashed var(--overlay-med);border-radius:10px;display:flex;align-items:center;justify-content:center;transition:all .15s ease;background:var(--overlay-soft);padding:.5rem}.dropzone.dragover .dropzone__drop-area{border-color:var(--color-primary);background:rgba(var(--color-primary-rgb),.08)}.dropzone.correct .dropzone__drop-area{border-color:var(--color-success);background:var(--color-success-soft)}.dropzone.incorrect .dropzone__drop-area{border-color:var(--color-error);background:var(--color-error-soft)}.activity-apply__quiz-visual{position:relative;display:flex;justify-content:center;align-items:center;margin:.5rem 0}.activity-apply__quiz-img{max-width:100%;height:auto;max-height:180px}@media (min-width: 768px){.activity-apply__quiz-img{max-height:160px}}.dropzone__drop-area{width:100%;min-height:90px;border:2px dashed rgba(var(--color-primary-rgb),.5);border-radius:8px;display:flex;align-items:center;justify-content:center;transition:all .15s ease;background:rgba(var(--color-primary-rgb),.05);padding:.5rem}.activity-apply__draggables{display:flex;gap:.75rem;padding:.75rem;background:var(--overlay-soft);border:1px solid var(--overlay-med);border-radius:10px;justify-content:center;flex-wrap:wrap}.draggable{background:var(--overlay-soft);border:2px solid var(--overlay-med);border-radius:6px;padding:.5rem;cursor:grab;transition:all .15s ease;display:inline-flex;align-items:center;justify-content:center;min-width:100px;min-height:80px}.draggable:hover{border-color:rgba(var(--color-primary-rgb),.5);transform:translateY(-2px);box-shadow:0 4px 12px rgba(var(--color-primary-rgb),.15)}.draggable.dragging{opacity:.5;cursor:grabbing}.draggable.correct{border-color:var(--color-success);box-shadow:0 0 0 2px #2dd4a733}.draggable.incorrect{border-color:var(--color-error);box-shadow:0 0 0 2px #f2555a33}.draggable__img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;pointer-events:none}.dropzone__drop-area .draggable{margin:0;min-width:100px;min-height:80px}.activity-apply__actions{display:flex;justify-content:flex-end;gap:.75rem;margin-top:.5rem}.activity-apply__btn{padding:.625rem 1.5rem;border-radius:8px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .15s ease;border:none}.activity-apply__btn:disabled{opacity:.5;cursor:not-allowed}.activity-apply__btn--reset{background:transparent;color:var(--color-text-default);border:1px solid var(--overlay-med)}.activity-apply__btn--reset:not(:disabled):hover{background:var(--overlay-soft);border-color:var(--overlay-med);color:var(--color-text-stronger)}.activity-apply__btn--submit{background:var(--color-primary);color:#fff;border:1px solid var(--color-primary)}.activity-apply__btn--submit:not(:disabled):hover{background:var(--color-primary-dark);border-color:var(--color-primary-dark)}.activity-apply__feedback-card{margin-top:2rem;padding:1.5rem;border-radius:12px;border:1px solid var(--overlay-med);background:rgba(var(--color-primary-rgb),.08);display:none}.activity-apply__feedback-card[data-state=success],.activity-apply__feedback-card[data-state=error]{display:block}.activity-apply__feedback-card[data-state=success],.activity-apply__feedback-card[data-state=error]{background:rgba(var(--color-primary-rgb),.08);border-color:rgba(var(--color-primary-rgb),.2)}.feedback-card__header{display:flex;align-items:center;gap:.75rem;margin-bottom:.75rem}.feedback-card__icon{width:32px;height:32px;display:flex;align-items:center;justify-content:center}.feedback-card__icon svg{width:100%;height:100%}[data-state=success] .feedback-card__icon{color:var(--color-success)}[data-state=error] .feedback-card__icon{color:var(--color-error)}.feedback-card__title{font-size:1.25rem;font-weight:500;color:var(--color-text-stronger);margin:0}.feedback-card__text{font-size:.95rem;color:var(--color-text-default);line-height:1.6;margin:0 0 1.25rem}.feedback-card__text em{font-style:italic;color:var(--color-text-default)}.feedback-card__actions{display:flex;gap:.75rem}.feedback-card__btn{display:inline-flex;align-items:center;justify-content:center;padding:.625rem 1.25rem;border-radius:8px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .15s ease;border:none}.feedback-card__btn--outline{background:transparent;color:var(--color-text-default);border:1px solid rgba(var(--color-primary-rgb),.5)}.feedback-card__btn--outline:hover{background:rgba(var(--color-primary-rgb),.1);border-color:var(--color-primary);color:var(--color-text-stronger)}.feedback-card__btn--primary{background:var(--color-primary);color:#fff}.feedback-card__btn--primary:hover{background:var(--color-primary-dark)}.activity-tabs{display:flex;border-bottom:1px solid var(--overlay-soft);padding:0 1rem;background:var(--color-surface-dark)}@media (min-width: 1024px){.activity-tabs{display:none}}.activity-tab{display:flex;align-items:center;gap:.5rem;padding:1rem 1.5rem;font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-default);border:none;background:transparent;cursor:pointer;position:relative;transition:color .15s ease}.activity-tab svg{width:14px;height:14px}.activity-tab:hover{color:var(--color-text-stronger)}.activity-tab.active{color:var(--color-primary)}.activity-tab.active:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--color-primary)}@media (max-width: 1023px){.activity-read,.activity-apply{display:none}.activity-read.active,.activity-apply.active{display:flex}.activity-content{grid-template-columns:1fr}}@media (max-width: 768px){.activity-sidebar{width:52px;padding:1rem .5rem}.activity-main{margin-left:52px}.activity-step__check{width:14px;height:14px}.activity-apply__dropzones{grid-template-columns:1fr;gap:1rem}.activity-apply__quiz-img{max-height:150px}}.activity-apply__slider-container{display:flex;flex-direction:column;gap:1.5rem;padding:1.5rem;background:var(--color-surface-default);border-radius:12px;border:1px solid var(--overlay-med)}.activity-apply__slider-visual{display:flex;justify-content:center;align-items:center;min-height:200px;overflow:hidden}.activity-apply__slider-img{max-width:100%;max-height:300px;object-fit:contain;transition:transform .3s ease}.activity-apply__lottie-visual{display:flex;justify-content:center;align-items:center;min-height:200px;width:100%;max-width:440px;margin:0 auto}.activity-apply__lottie-visual svg{width:100%;height:auto}.activity-read__lottie-wrapper{position:relative;background:#0000004d;border-radius:.75rem;overflow:visible;margin:1.5rem 0}.activity-read__lottie{width:100%;display:flex;justify-content:center;align-items:center;border-radius:.75rem .75rem 0 0;overflow:hidden}.activity-read__lottie svg{width:100%;height:auto;max-height:300px}.activity-read__controls{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;opacity:0;transition:opacity .2s ease;z-index:100}.activity-read__lottie-wrapper:hover .activity-read__controls{opacity:1}.lottie-play-btn{width:48px;height:48px;min-width:48px;min-height:48px;border-radius:50%;border:none;background:var(--color-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;opacity:.9;z-index:101;position:relative}.lottie-play-btn:hover{opacity:1;transform:scale(1.05);background:var(--color-primary-dark)}.lottie-play-btn svg{width:24px;height:24px;color:#fff;fill:#fff}.lottie-scrubber{position:absolute;bottom:0;left:1rem;right:1rem;height:20px;transform:translateY(50%)}.lottie-scrubber__track{position:absolute;top:50%;left:0;right:0;height:4px;background:rgba(var(--color-primary-rgb),.3);border-radius:2px;transform:translateY(-50%)}.lottie-scrubber__progress{height:100%;background:var(--color-primary);border-radius:2px;width:0%;transition:width .05s linear}.lottie-scrubber__thumb{position:absolute;top:50%;left:0%;width:14px;height:14px;background:var(--color-primary);border-radius:50%;transform:translate(-50%,-50%);transition:left .05s linear;pointer-events:none}.lottie-scrubber__input{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer;margin:0}.activity-read__caption{text-align:center;font-size:.875rem;font-style:italic;color:var(--color-text-secondary);padding:1.25rem 1rem .75rem;margin:0}.activity-apply__slider-controls{padding:.5rem 0}.activity-apply__slider-track{position:relative;padding:1rem 0;--fill-percent: 0%}.activity-apply__slider-track:before{content:"";position:absolute;top:50%;left:0;transform:translateY(-50%);height:2px;width:var(--fill-percent);background:var(--color-primary);border-radius:1px;z-index:1;pointer-events:none}.slider-marker{position:absolute;top:50%;transform:translateY(-50%);width:1px;height:8px;background:var(--overlay-med);z-index:3;pointer-events:none;left:50%}.slider-marker:nth-child(n+3){display:none}.activity-apply__slider{position:relative;width:100%;height:2px;border-radius:1px;background:var(--overlay-med);outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none;z-index:2;cursor:pointer}.activity-apply__slider::-webkit-slider-runnable-track{height:2px;border-radius:1px;background:transparent}.activity-apply__slider::-moz-range-track{height:2px;border-radius:1px;background:transparent}.activity-apply__slider::-moz-range-progress{height:2px;border-radius:1px;background:var(--color-primary)}.activity-apply__slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:1.125rem;height:1.125rem;border-radius:50%;background:var(--color-primary);border:2px solid var(--color-primary);cursor:pointer;transition:all .15s ease;margin-top:-.5rem}.activity-apply__slider::-webkit-slider-thumb:hover{background:var(--color-primary-dark);border-color:var(--color-primary-dark)}.activity-apply__slider::-webkit-slider-thumb:active{background:var(--color-primary-dark);border-color:var(--color-primary-dark)}.activity-apply__slider::-moz-range-thumb{width:1.125rem;height:1.125rem;border-radius:50%;background:var(--color-primary);border:2px solid var(--color-primary);cursor:pointer;transition:all .15s ease}.activity-apply__slider::-moz-range-thumb:hover{background:var(--color-primary-dark);border-color:var(--color-primary-dark)}.activity-apply__placeholder{display:flex;flex-direction:column;gap:1.5rem;padding:2rem;background:rgba(var(--color-primary-rgb),.05);border-radius:12px;border:1px dashed rgba(var(--color-primary-rgb),.3);text-align:center}.activity-apply__placeholder p{color:var(--color-text-default);font-size:.95rem}.activity-apply__placeholder .activity-apply__actions{justify-content:center}.slider-stages{position:relative;display:grid}.slider-stage{grid-area:1 / 1;margin:0;display:flex;flex-direction:column;align-items:center;gap:.5rem;opacity:0;visibility:hidden;transition:opacity .26s ease}.slider-stage[data-active]{opacity:1;visibility:visible}.slider-stage img{width:100%;max-width:22rem;height:auto}.slider-stage figcaption{font-family:var(--font-mono, ui-monospace, monospace);font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;color:var(--color-text-subtle)}@media (prefers-reduced-motion: reduce){.slider-stage{transition:none}}.dropzone__label{display:block;margin-top:.5rem;text-align:center;font-family:var(--font-mono, ui-monospace, monospace);font-size:.6875rem;letter-spacing:.1em;color:var(--color-text-subtle)}.activity-read__svg-inner{display:block;width:100%}.activity-read__svg-inner svg{display:block;width:100%;height:auto;color:var(--tx)}[data-zone][data-aimed=true]{outline:2px solid var(--acc);outline-offset:3px}[data-draggable][data-dragging=true]{opacity:.6}.activity-read__video-el{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--plate);padding:var(--spacing-3)}.activity-read__missing-panel{display:flex;align-items:center;justify-content:center;min-height:120px;padding:var(--spacing-5);border:1px dashed var(--line);border-radius:var(--radius-lg);background:var(--inset);color:var(--tx2);font-size:var(--text-sm);text-align:center}qourse-model,.model-view{display:block}.model-view__frame{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--inset)}.model-view__poster{display:block;width:100%;height:auto}.model-view__poster--missing{display:flex;align-items:center;justify-content:center;min-height:200px;padding:var(--spacing-5);color:var(--tx2);font-size:var(--text-sm);text-align:center}.model-view__surface{position:relative;display:block;width:100%;aspect-ratio:4 / 3;touch-action:none;cursor:grab}.model-view__surface:active{cursor:grabbing}.model-view__canvas{display:block;width:100%;height:100%}.model-view__loading{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;margin:0;color:var(--tx2);font-size:var(--text-sm)}.model-view__bar{display:flex;align-items:center;gap:var(--spacing-4);flex-wrap:wrap;margin-top:var(--spacing-3)}.model-view__toggle{min-height:44px}.model-view__hint,.model-view__status,.model-view__note{margin:0;max-width:var(--measure);font-size:.8125rem;line-height:1.5;color:var(--tx3)}.model-view__status{min-height:0}.model-view__note{padding:var(--spacing-5);color:var(--tx2);text-align:center}.activity-read__math{margin:1.25rem 0;padding:0;border:1px solid var(--line);border-radius:8px;background:var(--surf)}.activity-read__math-summary{display:flex;align-items:center;min-height:44px;padding:0 1rem;color:var(--tx2, var(--tx));font-family:var(--font-sans);font-size:.875rem;cursor:pointer}.activity-read__math-body{padding:0 1rem 1rem;overflow-x:auto;color:var(--tx)}.activity-read__math-body .katex{color:var(--tx)}.lab-page{flex:1;display:flex;flex-direction:column;gap:30px;max-width:var(--container-2xl);width:100%;margin:0 auto;padding:44px var(--gutter) 52px}.lab-head{display:flex;align-items:flex-end;justify-content:space-between;gap:var(--spacing-10);flex-wrap:wrap}.lab-head__id{display:flex;flex-direction:column;gap:var(--spacing-3)}.lab-head__id h1{margin:0}.lab-head__id p{margin:0;max-width:var(--measure);font-size:var(--text-base);line-height:1.65;color:var(--tx2);text-wrap:pretty}.lab-head__count{flex:none;display:flex;flex-direction:column;gap:var(--spacing-1);padding:var(--spacing-4) var(--spacing-5);border-radius:12px;background:var(--surf);border:1px solid var(--line)}.lab-head__count-value{font-family:var(--font-mono);font-size:1.375rem;font-weight:var(--font-semibold);color:var(--tx)}.lab-head__count-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--tx3)}.lab-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:var(--spacing-4)}.lab-card{display:flex;flex-direction:column;gap:var(--spacing-3);padding:var(--spacing-6);border-radius:var(--radius-xl);background:var(--surf);border:1px solid var(--line);text-decoration:none;transition:border-color var(--transition-fast),background-color var(--transition-fast)}.lab-card:hover{border-color:var(--accline)}.lab-card--solved{border-color:color-mix(in srgb,var(--ok) 45%,transparent)}.lab-card__head{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-3)}.lab-card__eyebrow{font-family:var(--font-mono);font-size:11px;font-weight:var(--font-medium);letter-spacing:.16em;color:var(--warn)}.lab-card--solved .lab-card__eyebrow{color:var(--tx3)}.lab-card__solved{display:inline-flex;align-items:center;gap:var(--spacing-1);font-size:var(--text-xs);font-weight:var(--font-semibold);color:var(--ok)}.lab-card__title{margin:0;font-size:1.1875rem;line-height:1.25;color:var(--tx)}.lab-card__where{font-size:.8125rem;color:var(--tx3)}.lab-card__chips{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-2);margin-top:var(--spacing-1)}.lab-card__chip{display:flex;flex-direction:column;gap:3px;padding:9px var(--spacing-3);border-radius:var(--radius-md);background:var(--inset);border:1px solid 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