.student-ws-player{position:relative;display:grid;width:100%;max-width:720px;margin-inline:auto;grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto minmax(0,1fr) auto;min-height:calc(100dvh - var(--ws-top, 96px) - var(--space-4) - env(safe-area-inset-bottom));grid-gap:var(--space-4);gap:var(--space-4)}.student-ws-player--empty{min-height:0;grid-template-rows:none;min-height:60dvh;padding:var(--space-6) var(--space-4);justify-items:center;align-content:center;text-align:center}.student-ws-player--empty p{max-width:40ch;margin:0;color:var(--fg-2)}.student-ws-player__head{display:flex;align-items:center;gap:var(--space-3)}.student-ws-player__title{min-width:0;flex:1 1 auto}.student-ws-player__title h2{margin:0;-webkit-line-clamp:2;font-size:var(--t-md);line-height:var(--lh-md)}.student-ws-player__title h2,.student-ws-player__title p{display:-webkit-box;overflow:hidden;-webkit-box-orient:vertical;overflow-wrap:anywhere}.student-ws-player__title p{margin:2px 0 0;-webkit-line-clamp:1;color:var(--fg-3);font-size:var(--t-sm)}.student-ws-player__exit{display:grid;width:44px;height:44px;flex:0 0 auto;border:1px solid var(--border-2);border-radius:var(--radius-md);background:var(--bg-surface);color:var(--fg-2);font:inherit;cursor:pointer;place-items:center}.student-ws-player__exit:hover{background:var(--purple-4);color:var(--fg-1)}.student-ws-player__exit:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-player__progress{height:6px;overflow:hidden;border-radius:var(--radius-pill);background:var(--purple-4)}.student-ws-player__progress span{display:block;width:100%;height:100%;border-radius:inherit;background:var(--brand-purple);transform:scaleX(var(--p,0));transform-origin:left center;transition:transform var(--dur-slow) var(--ease-standard)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;-webkit-clip-path:inset(50%);clip-path:inset(50%);white-space:nowrap}.student-ws-player__card{position:relative;display:grid;min-height:0;overflow-y:auto;align-content:center;grid-template-columns:minmax(0,1fr);grid-gap:var(--space-4);gap:var(--space-4);padding:var(--space-5);border:1px solid var(--border-2);border-radius:var(--radius-2xl);background:var(--bg-surface);touch-action:pan-y}.student-ws-player__nim-dock{position:relative;flex:0 0 auto}.student-ws-player__nim-ring{display:grid;width:48px;height:48px;padding:0;border:1px solid var(--border-2);border-radius:var(--radius-pill);background:var(--purple-3);cursor:pointer;place-items:center;transition:transform var(--dur-fast) var(--ease-standard)}.student-ws-player__nim-ring:active{transform:scale(.9)}.student-ws-player__nim-ring:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-player__nim-ring .nim-companion{width:40px;height:36px}.student-ws-player__nim-ring canvas{width:100%;height:100%}@media (prefers-reduced-motion:reduce){.student-ws-player__nim-ring{transition:none}}.student-ws-thought{position:absolute;right:0;bottom:calc(100% + 68px);z-index:41;width:min(320px,calc(100vw - var(--space-6)));pointer-events:none}.student-ws-thought__cloud{display:grid;grid-gap:var(--space-2);gap:var(--space-2);justify-items:start;padding:var(--space-4) var(--space-5);border:1px solid var(--purple-1);border-radius:32px;background:var(--purple-1);color:var(--fg-inverse);box-shadow:var(--shadow-card);pointer-events:auto;animation:student-ws-thought-pop var(--dur-base) var(--ease-enter) both;animation-delay:.24s}.student-ws-thought__cloud strong{font-size:var(--t-sm);color:var(--fg-inverse)}.student-ws-thought__cloud p{margin:0;color:var(--fg-inverse)}.student-ws-thought__cloud .btn--ghost,.student-ws-thought__cloud .btn--outline{border-color:color-mix(in srgb,var(--fg-inverse) 60%,transparent);color:var(--fg-inverse);background:transparent}.student-ws-thought__cloud .btn--ghost:hover,.student-ws-thought__cloud .btn--outline:hover{background:color-mix(in srgb,var(--fg-inverse) 16%,transparent)}.student-ws-thought__rungs{display:grid;grid-gap:var(--space-3);gap:var(--space-3);width:100%;max-height:46dvh;margin:0;padding:0;overflow-y:auto;list-style:none}.student-ws-thought__rung{display:grid;grid-gap:var(--space-1);gap:var(--space-1)}.student-ws-thought__rung+.student-ws-thought__rung{padding-top:var(--space-3);border-top:1px solid var(--border-2)}.student-ws-thought__count{font-size:var(--t-xs);color:color-mix(in srgb,var(--fg-inverse) 72%,transparent)}.student-ws-thought__rung strong{font-size:var(--t-sm);color:var(--fg-inverse)}.student-ws-thought__rung+.student-ws-thought__rung{border-top-color:color-mix(in srgb,var(--fg-inverse) 28%,transparent)}.student-ws-thought__more{display:flex;flex-wrap:wrap;gap:var(--space-2);width:100%}.student-ws-thought__dot{position:absolute;border:1px solid var(--border-2);border-radius:var(--radius-pill);background:var(--bg-surface);box-shadow:var(--shadow-card);animation:student-ws-thought-pop var(--dur-base) var(--ease-enter) both}.student-ws-thought__dot--1{right:16px;bottom:-62px;width:8px;height:8px}.student-ws-thought__dot--2{right:26px;bottom:-46px;width:13px;height:13px;animation-delay:80ms}.student-ws-thought__dot--3{right:38px;bottom:-26px;width:18px;height:18px;animation-delay:.16s}.student-ws-thought--speech .student-ws-speech--bare{position:static;width:100%}.student-ws-thought--speech .student-ws-speech__bubble{padding:0;border:none;border-radius:0;background:transparent;box-shadow:none}@keyframes student-ws-thought-pop{0%{opacity:0;transform:scale(.4)}to{opacity:1;transform:scale(1)}}@media (prefers-reduced-motion:reduce){.student-ws-player__nim-ask,.student-ws-thought__cloud,.student-ws-thought__dot{animation:none}}.student-ws-player__task{display:grid;grid-gap:var(--space-2);gap:var(--space-2)}.student-ws-player__prompt-fold{display:flex;align-items:baseline;gap:var(--space-1);padding:0;border:none;background:transparent;color:var(--fg-2);font:inherit;text-align:left;cursor:pointer}.student-ws-player__prompt-fold>:first-child{display:-webkit-box;overflow:hidden;-webkit-box-orient:vertical;-webkit-line-clamp:1;min-width:0;flex:1 1 auto}.student-ws-player__prompt-fold.is-open>:first-child{-webkit-line-clamp:unset}.student-ws-player__prompt-fold i{flex:none;translate:0 2px}.student-ws-player__prompt-fold:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px;border-radius:var(--radius-sm)}.student-ws-player__category{color:var(--fg-3);font-size:var(--t-xs,12px);letter-spacing:.04em}.student-ws-player__task h3{margin:0;font-size:var(--t-base);line-height:var(--lh-base);text-wrap:balance}.student-ws-player__task p{margin:0;color:var(--fg-2)}.student-ws-player__missing{margin:0;padding:var(--space-3) var(--space-4);border-radius:var(--radius-lg);background:var(--warning-surface);color:var(--warning-ink)}.student-ws-player__verdict{display:grid;grid-gap:var(--space-3);gap:var(--space-3);padding-top:var(--space-4);border-top:1px solid var(--border-1)}.student-ws-player__verdict strong{display:block;margin-bottom:var(--space-1)}.student-ws-player__verdict p{margin:0;color:var(--fg-2)}.student-ws-player__real-life{padding:var(--space-3);border-radius:var(--radius-lg);background:var(--purple-3)}.student-ws-player__no-trace{margin:var(--space-4) 0 0;padding:var(--space-3);border-radius:var(--radius-lg);background:var(--bg-muted);color:var(--fg-2)}.student-ws-player__walkthrough{justify-self:start}.student-ws-player__actions{position:-webkit-sticky;position:sticky;z-index:39;bottom:var(--space-4);display:flex;align-items:center;gap:var(--space-2);padding:var(--space-3) 0 var(--space-2);background:var(--bg-surface)}.student-ws-player__actions:before{position:absolute;right:0;bottom:100%;left:0;height:var(--space-6);background:linear-gradient(to bottom,hsla(0,0%,100%,0),var(--bg-surface));content:"";pointer-events:none}body.student-ws-immersed .student-bottom-nav{display:none}@media (max-width:900px){.student-ws-player__actions{bottom:calc(var(--space-3) + env(safe-area-inset-bottom))}}.student-ws-player__step{display:grid;width:48px;height:48px;flex:0 0 auto;border:1px solid var(--border-2);border-radius:var(--radius-lg);background:var(--bg-surface);color:var(--fg-2);cursor:pointer;place-items:center}.student-ws-player__step:hover:not(:disabled){background:var(--purple-3)}.student-ws-player__step:disabled{opacity:.35;cursor:default}.student-ws-player__step:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-player__main{flex:1 1 auto;justify-content:center}@media (min-width:901px){.student-ws-player__main{min-width:176px;flex:0 0 auto;margin-left:auto}}@media (max-width:360px){.student-ws-player__actions{flex-wrap:wrap}.student-ws-player__main{order:-1;flex:1 0 100%}}.student-ws-player__sheet-submit{width:100%;margin-bottom:var(--space-3);justify-content:center}.student-ws-player__confirm{display:grid;grid-gap:var(--space-3);gap:var(--space-3)}.student-ws-player__confirm h3{margin:0;font-size:var(--t-lg);line-height:var(--lh-lg)}.student-ws-player__confirm p{margin:0;color:var(--fg-2)}.student-ws-player__confirm-actions{display:grid;grid-gap:var(--space-2);gap:var(--space-2)}.student-ws-player__confirm-actions .btn{justify-content:center}@media (min-width:560px){.student-ws-player__confirm-actions{grid-template-columns:1fr 1fr}}.student-ws-player__sheet{position:fixed;z-index:40;inset:0}.student-ws-player__sheet-bg{position:absolute;inset:0;border:0;background:rgba(35,35,35,.35);cursor:pointer;animation:student-sheet-bg .24s var(--ease-standard) both}.student-ws-player__sheet-panel{position:absolute;right:0;bottom:0;left:0;max-height:78vh;padding:var(--space-4) var(--space-3) calc(var(--space-5) + env(safe-area-inset-bottom));overflow-y:auto;border-radius:var(--radius-2xl) var(--radius-2xl) 0 0;background:var(--bg-surface);animation:student-sheet-in var(--dur-slow) var(--ease-enter) both}@media (prefers-reduced-motion:reduce){.student-ws-player__sheet-panel{animation:student-sheet-bg .2s var(--ease-standard) both}}@media (min-width:760px){.student-ws-player__sheet-panel{top:50%;right:auto;bottom:auto;left:calc(var(--ws-actions-left, 0px) + var(--ws-actions-width, 100%) / 2);width:min(520px,var(--ws-actions-width,520px));padding-bottom:var(--space-4);border-radius:var(--radius-2xl);transform:translate(-50%,-50%);animation:student-sheet-center .32s var(--ease-enter) both}@keyframes student-sheet-center{0%{opacity:0;transform:translate(-50%,-46%) scale(.96)}}}.student-ws-player__sheet-title{margin:0 var(--space-2) var(--space-3);color:var(--fg-3);font-size:var(--t-sm)}.student-ws-player__modal{position:fixed;z-index:210;inset:0;display:grid;padding:var(--space-4);place-items:center}.student-ws-player__modal-bg{position:absolute;inset:0;border:0;background:rgba(35,35,35,.42);cursor:pointer}.student-ws-player__intro-bg{position:absolute;inset:0;background:color-mix(in srgb,var(--bg-surface) 78%,transparent);overscroll-behavior:contain;touch-action:none}.student-ws-player__intro{animation:none}.student-ws-player__modal-panel{position:relative;display:grid;width:min(420px,100%);max-height:calc(100dvh - var(--space-12));grid-gap:var(--space-3);gap:var(--space-3);padding:var(--space-5) var(--space-4) var(--space-4);overflow-y:auto;border-radius:var(--radius-2xl);background:var(--bg-surface);box-shadow:var(--shadow-card-hover);animation:student-modal-in var(--dur-base) var(--ease-standard) both}@keyframes student-modal-in{0%{opacity:0;transform:translateY(8px) scale(.98)}}.student-ws-player__modal-panel h3{margin:0;font-size:var(--t-lg);line-height:var(--lh-lg);text-align:center}.student-ws-player__modal-panel p{margin:0;color:var(--fg-2)}.student-ws-says{display:grid;grid-template-columns:56px minmax(0,1fr);align-items:start;grid-gap:var(--space-3);gap:var(--space-3);text-align:left}.student-ws-says--lg{grid-template-columns:84px minmax(0,1fr)}.student-ws-says__nim{width:56px;height:56px}.student-ws-says--lg .student-ws-says__nim{width:84px;height:84px}.student-ws-says__bubble{position:relative;display:grid;grid-gap:var(--space-2);gap:var(--space-2);padding:var(--space-3);border-radius:var(--radius-lg);background:var(--purple-3)}.student-ws-says__bubble:before{position:absolute;top:22px;left:-6px;width:12px;height:12px;border-radius:2px;background:var(--purple-3);content:"";transform:rotate(45deg)}.student-ws-says__caption{color:var(--fg-3);font-size:var(--t-xs,12px);letter-spacing:.04em}.student-ws-says__text{margin:0;color:var(--fg-1);line-height:var(--lh-base)}.student-ws-says__caret{display:inline-block;width:2px;height:1em;margin-left:2px;background:var(--brand-purple);vertical-align:-2px;animation:student-ws-says-caret 1s steps(2,start) infinite}@keyframes student-ws-says-caret{50%{opacity:0}}.student-ws-player__verdict .student-ws-says{margin-top:var(--space-1)}.student-ws-player__modal-step{min-height:84px;padding:var(--space-3);border-radius:var(--radius-lg);background:var(--purple-3);color:var(--fg-1)!important;line-height:var(--lh-base);animation:student-hint-step var(--dur-base) var(--ease-standard) both}@keyframes student-hint-step{0%{opacity:0;transform:translateY(6px)}}.student-ws-player__modal-actions{display:grid;grid-gap:var(--space-2);gap:var(--space-2)}.student-ws-player__modal-actions .btn,.student-ws-player__modal-panel>.btn{justify-content:center}@media (min-width:480px){.student-ws-player__modal-actions{grid-template-columns:1fr 1fr}}@media (prefers-reduced-motion:reduce){.student-ws-player__modal-panel,.student-ws-player__modal-step,.student-ws-says__caret{animation:none}}.student-ws-player__counter{display:inline-flex;min-height:44px;flex:0 0 auto;align-items:center;white-space:nowrap;gap:var(--space-1);padding:0 var(--space-3);border:1px solid var(--border-2);border-radius:var(--radius-pill);background:var(--bg-surface);color:var(--fg-1);font:inherit;font-weight:var(--fw-medium);cursor:pointer}.student-ws-player__counter:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-player__map{display:grid;grid-gap:var(--space-1);gap:var(--space-1);margin:0;padding:0;list-style:none}.student-ws-player__map button{display:flex;width:100%;min-height:44px;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-3);border:0;border-radius:var(--radius-md);background:transparent;color:var(--fg-1);font:inherit;text-align:left;cursor:pointer}.student-ws-player__map button:hover{background:var(--purple-3)}.student-ws-player__map button:focus-visible{outline:2px solid var(--brand-purple);outline-offset:-2px}.student-ws-player__map button.is-active{background:var(--purple-4);font-weight:var(--fw-medium)}.student-ws-player__map-num{display:grid;width:28px;height:28px;flex:0 0 28px;border-radius:50%;background:var(--bg-muted);color:var(--fg-3);font-size:var(--t-sm);place-items:center}.student-ws-player__map-title{min-width:0;flex:1 1 auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.student-ws-player__map-title span{display:block;color:var(--fg-3);font-size:var(--t-xs,12px);font-weight:var(--fw-regular,400)}.student-ws-player__map button.is-complete .student-ws-player__map-num{background:var(--success);color:var(--fg-inverse)}.student-ws-verdict__mistake{margin:0;padding:var(--space-3);border-radius:var(--radius-lg);background:var(--danger-surface);color:var(--fg-1)}.student-ws-choice{display:grid;grid-gap:var(--space-3);gap:var(--space-3)}.student-ws-choice__hint{margin:0;color:var(--fg-2);font-size:var(--t-sm)}.student-ws-choice__list{display:grid;grid-gap:var(--space-2);gap:var(--space-2);margin:0;padding:0;list-style:none}.student-ws-choice__option{display:flex;width:100%;min-height:56px;align-items:center;gap:var(--space-3);padding:var(--space-3);border:1px solid var(--border-2);border-radius:var(--radius-lg);background:var(--bg-surface);color:var(--fg-1);font:inherit;text-align:left;cursor:pointer}.student-ws-choice__option:hover:not(:disabled){border-color:var(--brand-purple)}.student-ws-choice__option:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-choice__option.is-selected{border-color:var(--brand-purple);background:var(--purple-4)}.student-ws-choice__option.is-correct{border-color:var(--success);background:var(--success-surface)}.student-ws-choice__option.is-wrong{border-color:var(--danger);background:var(--danger-surface)}.student-ws-choice__marker{display:grid;width:28px;height:28px;flex:0 0 28px;border-radius:var(--radius-sm);background:var(--purple-4);color:var(--brand-purple);font-weight:var(--fw-medium);place-items:center}.student-ws-choice__text{min-width:0;overflow-wrap:anywhere}.student-ws-pairs{display:grid;grid-gap:var(--space-3);gap:var(--space-3)}.student-ws-pairs__hint{margin:0;color:var(--fg-3);font-size:var(--t-sm)}.student-ws-pairs__field{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);grid-template-rows:repeat(var(--pairs-rows,1),minmax(52px,auto));grid-gap:var(--space-2) var(--space-8);gap:var(--space-2) var(--space-8)}.student-ws-pairs__lines{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}.student-ws-pairs__lines path{fill:none;stroke:var(--brand-purple);stroke-linecap:round;stroke-width:3;cursor:pointer;pointer-events:stroke}.student-ws-pairs__lines path.is-correct{stroke:var(--success)}.student-ws-pairs__lines path.is-wrong{stroke:var(--danger)}.student-ws-pairs__lines path.is-dragging{stroke:var(--brand-purple-hover,var(--brand-purple));stroke-dasharray:6 6;pointer-events:none}.student-ws-pairs__column{display:grid;grid-row:1/-1;grid-template-rows:subgrid;grid-gap:var(--space-2);gap:var(--space-2);margin:0;padding:0;list-style:none}.student-ws-pairs__column>li{display:grid}.student-ws-pairs__cell{position:relative;z-index:2;display:flex;width:100%;min-height:52px;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);border:1px solid var(--border-2);border-radius:var(--radius-lg);background:var(--bg-surface);color:var(--fg-1);font:inherit;overflow-wrap:break-word;-webkit-hyphens:auto;hyphens:auto;hyphenate-limit-chars:6 3 3;text-wrap:pretty;text-align:left;touch-action:none;cursor:pointer}.student-ws-pairs__column--right .student-ws-pairs__cell{padding-left:var(--space-4)}.student-ws-pairs__cell span{min-width:0}[data-size=long],[data-size=verylong]{font-size:var(--t-sm);line-height:var(--lh-sm);-webkit-hyphens:auto;hyphens:auto;hyphenate-limit-chars:6 3 3;text-wrap:pretty;overflow-wrap:break-word}.student-ws-choice__option[data-size=verylong],.student-ws-pairs__cell[data-size=verylong]{align-items:flex-start}.student-ws-pairs__cell img{max-width:100%;height:auto;border-radius:var(--radius-md)}.student-ws-pairs__cell:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-pairs__cell:hover:not(:disabled){border-color:var(--brand-purple-hover,var(--brand-purple))}.student-ws-pairs__cell.is-active{border-color:var(--brand-purple);background:var(--purple-4)}.student-ws-pairs__cell.is-tied{border-color:var(--brand-purple)}.student-ws-pairs__cell.is-wrong{border-color:var(--danger)}.student-ws-pairs__dot{position:absolute;top:50%;width:12px;height:12px;margin-top:-6px;border:2px solid var(--brand-purple);border-radius:50%;background:var(--purple-4)}.student-ws-pairs__column .student-ws-pairs__dot{right:-7px}.student-ws-pairs__column--right .student-ws-pairs__dot{right:auto;left:-7px}.student-ws-pairs__cell.is-tied .student-ws-pairs__dot{background:var(--brand-purple)}.student-ws-pairs__made{display:grid;grid-gap:var(--space-2);gap:var(--space-2);margin:0;padding:0;list-style:none}.student-ws-pairs__made li{display:flex;min-height:44px;align-items:center;justify-content:space-between;gap:var(--space-2);padding:var(--space-2) var(--space-3);border-radius:var(--radius-lg);background:var(--purple-3)}.student-ws-pairs__made li.is-wrong{background:var(--danger-surface)}.student-ws-pairs__made li>span{min-width:0;overflow-wrap:anywhere}.student-ws-pairs__made button{display:grid;width:44px;height:44px;flex:0 0 44px;border:0;border-radius:50%;background:transparent;color:var(--fg-2);cursor:pointer;place-items:center}.student-ws-pairs__made button:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-keypad{display:grid;grid-gap:var(--space-2);gap:var(--space-2);width:100%;max-width:320px;margin-top:var(--space-2)}.student-ws-keypad__digits{display:grid;grid-template-columns:repeat(5,1fr);grid-gap:var(--space-2);gap:var(--space-2)}.student-ws-keypad__signs{display:flex;flex-wrap:wrap;gap:var(--space-2)}.student-ws-keypad__key{min-width:44px;min-height:44px;padding:0 var(--space-2);border:1px solid var(--border-2);border-radius:var(--radius-lg);background:var(--bg-surface);color:var(--fg-1);font-size:var(--t-base);line-height:var(--lh-base);font-weight:var(--fw-medium);cursor:pointer;transition:background var(--dur-fast) var(--ease-enter),border-color var(--dur-fast) var(--ease-enter)}.student-ws-keypad__key:hover{background:var(--purple-4);border-color:var(--brand-purple)}.student-ws-keypad__key:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-keypad__key--sign,.student-ws-keypad__key--word{background:var(--grey-2)}.student-ws-keypad__key--word{font-size:var(--t-sm)}.student-ws-keypad__key--layer{border-color:var(--brand-purple);background:var(--purple-4);color:var(--brand-purple)}.student-ws-keypad__key--layer.is-open{background:var(--brand-purple);color:var(--white)}.student-ws-keypad__signs--more{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));margin-top:6px}.student-ws-keypad__signs--more .student-ws-keypad__key{min-width:0;padding:0}.student-ws-keypad__key--back{margin-left:auto}.student-ws-examples__keypad{list-style:none;margin-top:var(--space-3)}@media 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var(--brand-purple);outline-offset:2px}.student-ws-player__hint{margin:0;padding:var(--space-3);border-radius:var(--radius-lg);background:var(--purple-3);color:var(--fg-2)}.student-ws-binary{overflow-x:clip}.student-ws-binary__deck{position:relative;height:232px}.student-ws-binary__card{position:absolute;top:0;right:0;left:0;display:grid;height:186px;align-content:center;padding:var(--space-5);border:1px solid var(--border-2);border-radius:var(--radius-2xl);background:var(--bg-surface);box-shadow:var(--shadow-card);touch-action:none;-webkit-user-select:none;-moz-user-select:none;user-select:none;transition:transform var(--dur-base) var(--ease-standard)}.student-ws-binary__card:not(.is-top){opacity:.55}.student-ws-binary__card.is-top{cursor:-webkit-grab;cursor:grab}.student-ws-binary__card p{font-size:var(--t-md);line-height:var(--lh-md)}.student-ws-binary__stamp{position:absolute;top:var(--space-4);padding:var(--space-1) 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16px)}.student-ws-draw__point:after{position:absolute;top:50%;left:50%;width:7px;height:7px;border:2px solid var(--bg-surface);border-radius:var(--radius-pill);background:var(--brand-purple);content:"";translate:-50% -50%}.student-ws-draw__point:active:not(:disabled){cursor:-webkit-grabbing;cursor:grabbing}.student-ws-draw__point:focus-visible{outline:2px solid var(--brand-purple);outline-offset:2px}.student-ws-draw__hint{margin:0;color:var(--fg-3);font-size:var(--t-sm);text-align:center}.student-ws-draw__undo{min-height:44px;padding:0 var(--space-3);border:1px solid 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(prefers-reduced-motion:reduce){.student-ws-scale__beam{transition:none}}.student-ws-compare-wrap{display:grid;grid-gap:var(--space-3);gap:var(--space-3);min-width:0}.student-ws-compare__counter{margin:0;color:var(--fg-3);font-size:var(--t-xs);letter-spacing:.04em}.student-ws-compare__nav{display:flex;justify-content:space-between;gap:var(--space-2)}.student-ws-compare__nav button{min-height:44px;padding:0 var(--space-4);border:2px solid var(--brand-purple);border-radius:var(--radius-pill);background:var(--purple-4);color:var(--brand-purple);font:inherit;font-weight:var(--fw-medium);cursor:pointer;transition:transform var(--dur-fast) var(--ease-standard),background-color var(--dur-fast) var(--ease-standard)}.student-ws-compare__nav button:active:not(:disabled){transform:scale(.96);background:var(--purple-5)}.student-ws-compare__nav button:disabled{border-color:var(--border-2);background:var(--bg-surface);color:var(--fg-3);cursor:default}@media (prefers-reduced-motion:reduce){.student-ws-compare__nav button{transition:none}.student-ws-compare__nav button:active:not(:disabled){transform:none}}.student-ws-examples li.is-fraction{align-items:center}.student-ws-fraction{display:flex;align-items:center;gap:var(--space-1);justify-content:flex-end}.student-ws-fraction.is-wrong{padding:var(--space-1);border-radius:var(--radius-md);background:var(--danger-surface)}.student-ws-fraction__whole{width:3ch;min-height:44px;padding:0;border:1px solid var(--border-2);border-radius:var(--radius-md);background:var(--bg-surface);color:var(--fg-1);font:inherit;text-align:center}.student-ws-fraction__stack{display:grid;grid-gap:3px;gap:3px;justify-items:stretch}.student-ws-fraction__stack input{width:4ch;min-height:44px;padding:0;border:1px solid var(--border-2);border-radius:var(--radius-md);background:var(--bg-surface);color:var(--fg-1);font:inherit;text-align:center}.student-ws-fraction__stack i{display:block;width:100%;height:2px;margin-block:1px;background:var(--fg-1)}.student-ws-fraction-field{display:grid;grid-gap:var(--space-2);gap:var(--space-2);justify-items:end}.student-ws-fraction-field .student-ws-keypad{width:100%}.student-ws-fraction__stack input[data-active=true],.student-ws-fraction__whole[data-active=true]{border-color:var(--brand-purple);box-shadow:0 0 0 2px var(--purple-4)}.student-ws-bar{display:inline-flex;align-items:center;gap:2px}.student-ws-bar i{display:block;width:10px;height:26px;border:1px solid var(--purple-4);border-radius:3px;background:var(--bg-surface)}.student-ws-bar i.is-filled{border-color:var(--brand-purple);background:var(--brand-purple)}.student-ws-bar b{margin-left:var(--space-1);color:var(--fg-2);font-size:var(--t-xs);font-weight:var(--fw-regular)}.student-ws-examples__expression{display:inline-flex;align-items:center;gap:var(--space-1);flex-wrap:wrap}.student-ws-examples__expression b{color:var(--fg-2);font-weight:var(--fw-medium)}.student-ws-draw__live{display:flex;align-items:center;justify-content:center;gap:var(--space-3)}.student-ws-draw__fraction{display:grid;justify-items:center;color:var(--brand-purple);font-size:var(--t-lg);font-weight:var(--fw-medium);line-height:1.1}.student-ws-draw__fraction i{display:block;width:100%;min-width:28px;height:2px;margin-block:3px;background:var(--fg-2)}.student-ws-draw__fraction span{color:var(--fg-1)}.student-ws-draw__short{color:var(--fg-2);font-size:var(--t-base)}.student-ws-draw__short b{color:var(--brand-purple);font-weight:var(--fw-medium)}.student-ws-draw__frame{position:relative;display:block;width:100%;max-width:100%;touch-action:none}.student-ws-draw__cells{position:absolute;inset:0;display:grid}.student-ws-draw__cells button{border:0;background:transparent;cursor:pointer;transition:background-color var(--dur-fast) var(--ease-standard)}.student-ws-draw__cells button.is-filled{background:var(--purple-4)}.student-ws-draw__cells button:focus-visible{outline:2px solid var(--brand-purple);outline-offset:-2px}@media (min-width:901px){.student-ws-scale,.student-ws-scale__signs{max-width:480px;margin-inline:auto}}.student-ws-table-wrap{display:grid;grid-gap:var(--space-2);gap:var(--space-2);min-width:0}.student-ws-table :is(th,td).is-sticky{position:-webkit-sticky;position:sticky;left:0;z-index:1;background:var(--bg-surface);box-shadow:1px 0 0 var(--border-1)}.student-ws-table th.is-sticky{z-index:2;background:var(--bg-muted)}.student-ws-table input.is-active{border-color:var(--brand-purple);background:var(--info-surface)}.student-ws-table__nav{display:flex;align-items:center;justify-content:space-between;gap:var(--space-2);color:var(--fg-3);font-size:var(--t-sm)}.student-ws-table__nav button{min-height:44px;padding:0 var(--space-3);border:1px solid var(--border-2);border-radius:var(--radius-md);background:var(--bg-surface);color:var(--brand-purple);font:inherit;cursor:pointer}.student-ws-letters-wrap{display:grid;grid-gap:var(--space-3);gap:var(--space-3);min-width:0}.student-ws-fill__letters,.student-ws-letters-wrap>.student-ws-letters__choices{position:-webkit-sticky;position:sticky;bottom:0;z-index:1;padding:var(--space-2) 0;background:var(--bg-surface);box-shadow:0 -1px 0 var(--border-1)}.student-ws-letters>li.is-active{border-color:var(--brand-purple)}.student-ws-draw__actions{display:flex;flex-wrap:wrap;gap:var(--space-2);justify-content:center}.student-ws-odd{display:grid;grid-gap:var(--space-3);gap:var(--space-3);min-width:0}.student-ws-odd__row{display:flex;flex-wrap:wrap;gap:var(--space-2);margin:0;padding:0;list-style:none}.student-ws-odd__card{position:relative;min-height:56px;padding:var(--space-2) var(--space-4);border:1px solid var(--border-2);border-radius:var(--radius-lg);background:var(--bg-surface);color:var(--fg-1);font:inherit;font-size:var(--t-base);cursor:pointer;transition:transform var(--dur-fast) var(--ease-standard),opacity var(--dur-base) var(--ease-standard),color var(--dur-base) var(--ease-standard)}.student-ws-odd__card:active:not(:disabled){transform:scale(.97)}.student-ws-odd__card.is-correct{border-color:var(--success);background:var(--success-surface)}.student-ws-odd__card.is-out{color:var(--fg-3);opacity:.55}.student-ws-odd__strike{position:absolute;inset:var(--space-2);background:linear-gradient(to top right,transparent calc(50% - 1.5px),var(--fg-2) calc(50% - 1.5px),var(--fg-2) calc(50% + 1.5px),transparent calc(50% + 1.5px));-webkit-clip-path:inset(0 100% 0 0);clip-path:inset(0 100% 0 0);transition:-webkit-clip-path var(--dur-base) var(--ease-standard);transition:clip-path var(--dur-base) var(--ease-standard);transition:clip-path var(--dur-base) var(--ease-standard),-webkit-clip-path var(--dur-base) var(--ease-standard);pointer-events:none}.student-ws-odd__card.is-out .student-ws-odd__strike{-webkit-clip-path:inset(0);clip-path:inset(0)}.student-ws-odd__hint{margin:0;color:var(--fg-3);font-size:var(--t-sm)}@media (prefers-reduced-motion:reduce){.student-ws-odd__card,.student-ws-odd__strike{transition:none}.student-ws-odd__card:active:not(:disabled){transform:none}}.student-ws-paper-attach{display:grid;grid-gap:var(--space-2);gap:var(--space-2);justify-items:start}.student-ws-paper-attach--primary{width:100%;padding:var(--space-2) 0}.student-ws-paper-attach__lead{margin:0 0 var(--space-1);color:var(--fg-2);font-size:var(--t-sm);line-height:var(--lh-sm)}.student-ws-paper-attach__toggle{min-height:44px;padding:0;border:0;background:transparent;color:var(--fg-3);font:inherit;font-size:var(--t-sm);text-decoration:underline;text-underline-offset:3px;cursor:pointer}.student-ws-paper-attach__toggle:hover{color:var(--brand-purple)}.student-ws-paper-attach__row{display:flex;gap:var(--space-3);align-items:center;justify-content:space-between;width:100%}.student-ws-paper-attach__hint{color:var(--fg-2);font-size:var(--t-sm);line-height:var(--lh-sm)}.student-ws-paper-attach__camera{display:grid;flex:0 0 auto;place-items:center;inline-size:44px;block-size:44px;border:1.5px solid var(--purple-4);border-radius:var(--radius-pill);background:var(--bg-surface);cursor:pointer;transition:background-color var(--dur-fast) var(--ease-standard),border-color var(--dur-fast) var(--ease-standard)}.student-ws-paper-attach__camera:hover{background:var(--purple-4);border-color:var(--brand-purple)}.student-ws-paper-attach__camera .ic{background:var(--brand-purple)}.student-ws-paper-shot{display:grid;grid-template-columns:auto 1fr auto auto;grid-gap:var(--space-2);gap:var(--space-2);align-items:center;width:100%;padding:var(--space-2);border:1px solid var(--border-2);border-radius:var(--radius-xl);background:var(--bg-surface)}.student-ws-paper-shot__image,.student-ws-paper-shot__stub{display:grid;place-items:center;inline-size:56px;block-size:56px;border-radius:var(--radius-lg);background:var(--grey-2);object-fit:cover}.student-ws-paper-shot__meta{display:grid;min-width:0}.student-ws-paper-shot__meta strong{font-size:var(--t-sm)}.student-ws-paper-shot__meta small{overflow:hidden;color:var(--fg-3);font-size:var(--t-xs);text-overflow:ellipsis;white-space:nowrap}.student-ws-paper-shot.is-failed .student-ws-paper-shot__meta small{overflow:visible;text-overflow:clip;white-space:normal}.student-ws-paper-shot.is-failed .student-ws-paper-shot__meta strong{color:var(--danger)}.student-ws-paper-shot__again{min-height:44px;padding:0 var(--space-2);border:0;background:transparent;color:var(--brand-purple);font:inherit;font-size:var(--t-sm);cursor:pointer}.student-ws-paper-shot__drop{display:grid;place-items:center;inline-size:44px;block-size:44px;border:0;border-radius:var(--radius-pill);background:transparent;color:var(--fg-3);font:inherit;cursor:pointer}.student-ws-paper-shot__drop:hover{background:var(--grey-2);color:var(--fg-1)}@media (max-width:420px){.student-ws-paper-shot{grid-template-columns:auto 1fr auto}.student-ws-paper-shot__again{grid-column:2/-1;justify-self:start}}@media (prefers-reduced-motion:reduce){.student-ws-paper-attach__camera{transition:none}.student-ws-paper-attach__camera:hover{transform:none}}.student-ws-chart{display:grid;grid-gap:var(--space-2);gap:var(--space-2)}.student-ws-chart__switch,.student-ws-table__view{display:flex;flex-wrap:wrap;gap:var(--space-2)}.student-ws-chart__switch button,.student-ws-table__view button{min-height:44px;padding:0 var(--space-3);border:1px solid var(--border-2);border-radius:var(--radius-md);background:var(--bg-surface);color:var(--fg-1);font:inherit;font-size:var(--t-sm);cursor:pointer}.student-ws-chart__switch button.is-active,.student-ws-table__view button[aria-pressed=true]{border-color:var(--brand-purple);color:var(--brand-purple);box-shadow:inset 0 0 0 1px var(--brand-purple)}.student-ws-chart__bars{display:flex;align-items:flex-end;gap:var(--space-2);height:min(200px,26dvh);margin:0;padding:0;overflow-x:auto;list-style:none}.student-ws-chart__bars>li{display:flex;flex:1 0 44px;height:100%}.student-ws-chart__bar{display:grid;width:100%;height:100%;padding:0;border:0;background:transparent;font:inherit;cursor:pointer;grid-template-rows:1fr auto;align-items:end;grid-gap:var(--space-1);gap:var(--space-1)}.student-ws-chart__column{position:relative;display:grid;align-self:stretch;width:100%;height:100%;place-items:end center}.student-ws-chart__column:before{content:"";position:absolute;inset-inline:0;bottom:0;height:100%;transform:scaleY(var(--fill,0));transform-origin:bottom;border-radius:8px 8px 0 0;background:linear-gradient(180deg,var(--brand-purple),var(--purple-2));transition:transform var(--dur-slow) var(--ease-standard)}.student-ws-chart__bar.is-active .student-ws-chart__column:before{background:linear-gradient(180deg,var(--purple-2),var(--brand-purple));box-shadow:0 0 0 2px var(--brand-purple)}.student-ws-chart__bar.is-hidden-value .student-ws-chart__column:before{border:2px dashed var(--purple-4);background:var(--bg-surface)}.student-ws-chart__bar.is-hidden-value i{position:relative;margin-bottom:var(--space-1);color:var(--fg-3);font-style:normal}.student-ws-chart__label{color:var(--fg-2);font-size:var(--t-xs);overflow-wrap:anywhere}.student-ws-chart__read{margin:0;color:var(--fg-2);font-size:var(--t-sm)}@media (prefers-reduced-motion:reduce){.student-ws-chart__column:before{transition:none}}.student-ws-plot{width:100%;max-width:420px;height:auto;margin-inline:auto}.student-ws-plot__axis{stroke:var(--purple-4);stroke-width:1.5}.student-ws-plot__line{stroke:var(--brand-purple);stroke-width:2;stroke-linejoin:round;stroke-linecap:round}.student-ws-plot__point circle{fill:var(--bg-surface);stroke:var(--brand-purple);stroke-width:2;cursor:pointer}.student-ws-plot__point.is-active circle{fill:var(--brand-purple)}.student-ws-plot__point.is-hidden-value circle{stroke-dasharray:3 3}.student-ws-plot__point:focus-visible circle{stroke:var(--fg-1)}.student-ws-plot__gap{stroke:var(--purple-4);stroke-width:2;stroke-dasharray:4 4}.student-ws-plot__point.is-hidden-value.is-active .student-ws-plot__gap{stroke:var(--brand-purple)}.student-ws-block-graphic__row{display:flex;flex-wrap:wrap;gap:var(--space-2)}.student-ws-board__probe{stroke:var(--orange-3)}.student-ws-board__probe-node{cursor:pointer}.student-ws-board__probe-node circle:last-child{fill:var(--bg-surface);stroke:var(--purple-5);transition:r var(--dur-fast) var(--ease-standard),stroke var(--dur-fast) var(--ease-standard)}.student-ws-board__probe-node.is-picked circle:last-child{fill:var(--orange-2);stroke:var(--orange-3)}.student-ws-board__probe-node:focus-visible{outline:none}.student-ws-board__probe-node:focus-visible circle:last-child{stroke:var(--brand-purple);stroke-width:3}@media (prefers-reduced-motion:reduce){.student-ws-board__probe-node circle:last-child{transition:none}}.student-ws-spot{position:fixed;inset:0;z-index:90}.student-ws-spot__veil{inset:0;background:color-mix(in srgb,var(--fg-1) 20%,transparent)}.student-ws-spot__ring,.student-ws-spot__veil{position:fixed;animation:student-ws-spot-in var(--dur-base) var(--ease-enter) both}.student-ws-spot__ring{border:2px solid var(--brand-purple);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand-purple) 28%,transparent);pointer-events:none}.student-ws-spot__say{position:fixed;left:50%;display:grid;grid-gap:var(--space-3);gap:var(--space-3);justify-items:start;width:min(320px,calc(100vw - var(--space-6)));padding:var(--space-4);border-radius:24px;background:var(--purple-1);color:var(--fg-inverse);box-shadow:var(--shadow-card);transform:translateX(-50%);animation:student-ws-spot-in var(--dur-base) var(--ease-enter) both}.student-ws-spot__say p{margin:0;color:var(--fg-inverse)}.student-ws-spot__foot{display:flex;align-items:center;gap:var(--space-3);width:100%}.student-ws-spot__count{font-size:var(--t-xs);color:color-mix(in srgb,var(--fg-inverse) 72%,transparent)}@keyframes student-ws-spot-in{0%{opacity:0}to{opacity:1}}@media (prefers-reduced-motion:reduce){.student-ws-spot__ring,.student-ws-spot__say,.student-ws-spot__veil{animation:none}}[data-filled=no].is-missing{border-color:var(--brand-purple);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand-purple) 24%,transparent);animation:student-ws-missing var(--dur-slow) var(--ease-enter) 2}@keyframes student-ws-missing{0%,to{transform:translateX(0)}25%{transform:translateX(-3px)}75%{transform:translateX(3px)}}@media (prefers-reduced-motion:reduce){[data-filled=no].is-missing{animation:none}}.student-ws-player__solution{padding:var(--space-3);border:1px solid var(--border-2);border-radius:var(--radius-lg)}.student-ws-invite{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3) var(--space-4);border:1px solid var(--purple-4);border-radius:var(--radius-lg);background:var(--purple-3);animation:student-ws-invite-in var(--dur-base) var(--ease-enter) both}.student-ws-invite strong{display:block;font-size:var(--t-sm)}.student-ws-invite p{margin:0;color:var(--fg-2);font-size:var(--t-sm);line-height:var(--lh-sm)}@keyframes student-ws-invite-in{0%{opacity:0;transform:translateY(6px)}}@media (prefers-reduced-motion:reduce){.student-ws-invite{animation:none}}.student-join-switch{display:grid;grid-gap:var(--space-2);gap:var(--space-2);padding:var(--space-4);border:1px solid var(--border-2);border-radius:var(--radius-lg);background:var(--bg-muted)}.student-join-switch p{margin:0;font-size:var(--t-sm);line-height:var(--lh-sm);color:var(--fg-2)}.student-join-switch__actions{display:flex;flex-wrap:wrap;gap:var(--space-2)}.student-ws-player__to-answer{position:-webkit-sticky;position:sticky;bottom:8px;z-index:3;display:inline-flex;align-items:center;gap:6px;align-self:center;min-height:44px;margin-top:var(--space-2);padding:0 18px;border:0;border-radius:999px;background:var(--brand-purple);color:var(--white);font:inherit;font-size:var(--t-sm);box-shadow:0 10px 24px rgba(20,9,58,.18);cursor:pointer;animation:ws-to-answer-in .22s var(--ease-standard) both}@keyframes ws-to-answer-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){.student-ws-player__to-answer{animation:none}}.student-ws-draw__targets{position:absolute;pointer-events:none;overflow:visible}.student-ws-draw__targets circle,.student-ws-draw__targets line,.student-ws-draw__targets path{fill:none;stroke:var(--brand-purple);stroke-width:2;stroke-linecap:round;opacity:.5;animation:student-ws-target-pulse 1.9s var(--ease-standard) infinite}.student-ws-draw__targets .is-taken{opacity:.16;animation:none}@keyframes student-ws-target-pulse{0%,to{opacity:.34;stroke-width:2}50%{opacity:.72;stroke-width:3}}@media (prefers-reduced-motion:reduce){.student-ws-draw__targets circle,.student-ws-draw__targets line,.student-ws-draw__targets path{animation:none;opacity:.45}}.student-ws-draw__arcs{position:absolute;pointer-events:none}.student-ws-draw__arcs path{fill:none;stroke:var(--brand-purple);stroke-width:3;stroke-linecap:round}.student-ws-draw__arcs circle{fill:var(--brand-purple)}.student-ws-draw__link polygon,.student-ws-draw__link polyline{stroke:var(--brand-purple);stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}.student-ws-draw__link{position:absolute;pointer-events:none;color:var(--brand-purple)}.student-ws-draw__link line{stroke:var(--brand-purple);stroke-width:2.5;stroke-linecap:round}.student-ws-figure{display:grid;grid-gap:var(--space-1);gap:var(--space-1);margin:0;justify-items:center}.student-ws-figure svg{width:100%;max-width:320px;max-height:30dvh}.student-ws-figure__line{fill:none;stroke:var(--fg-1);stroke-width:2;stroke-linejoin:round}.student-ws-figure__hint{fill:none;stroke:var(--fg-3);stroke-width:1.5}.student-ws-figure__dot{fill:var(--fg-1)}.student-ws-figure__text{fill:var(--fg-1);font-size:15px;font-weight:var(--fw-medium)}.student-ws-figure__vertex{fill:var(--fg-2);font-size:14px}.student-ws-figure__note{color:var(--fg-3);font-size:var(--t-sm);text-align:center}