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components{.btn{justify-content:center;align-items:center;gap:var(--space-2);min-block-size:var(--control-h);padding-block:var(--space-1);padding-inline:var(--control-px);border-radius:var(--radius);color:var(--color-text);font-size:var(--font-size-base);text-align:center;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background-color var(--dur-fast), border-color var(--dur-fast), color var(--dur-fast), box-shadow var(--dur-fast), translate var(--dur-fast) var(--ease-out);background:0 0;border:2px solid #0000;font-weight:700;line-height:1.2;text-decoration:none;display:inline-flex}.btn:hover{text-decoration:none}.btn--primary{background:var(--color-primary);color:var(--color-on-primary);box-shadow:var(--shadow-press)}.btn--primary:hover:not([disabled]){background:var(--color-primary-hover);color:var(--color-on-primary)}.btn--danger{--press-color:color-mix(in srgb, var(--color-danger) 55%, var(--gray-950));--shadow-press:0 var(--press-depth) 0 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0}.btn--ghost:hover:not([disabled]){background:var(--color-primary-bg);color:var(--color-primary)}.btn--sm{min-block-size:var(--control-h-sm);padding-inline:var(--space-3);font-size:var(--font-size-sm);border-radius:var(--radius-sm)}.btn--lg{min-block-size:var(--control-h-lg);padding-inline:var(--space-6);font-size:var(--font-size-lg)}.btn--icon{inline-size:var(--control-h);padding-inline:0}.btn--icon.btn--sm{inline-size:var(--control-h-sm)}.btn--icon.btn--lg{inline-size:var(--control-h-lg)}.btn--block{inline-size:100%;display:flex}.btn[disabled],.btn[aria-busy=true]{opacity:.55;cursor:not-allowed;box-shadow:none;translate:none}.btn[aria-busy=true]{cursor:progress}a.btn[disabled]{pointer-events:none}.btn .btn__spinner{border-width:2px;border-color:currentColor;border-block-start-color:#0000;block-size:1em;inline-size:1em;display:inline-block}.card{background:var(--color-surface);color:var(--color-text);border:1px solid 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var(--ease-out)}.avatar{--avatar-size:2.5rem;inline-size:var(--avatar-size);block-size:var(--avatar-size);border-radius:var(--radius-full);object-fit:cover;background:var(--color-primary-bg);color:var(--color-primary);font-size:calc(var(--avatar-size) * .4);text-transform:uppercase;-webkit-user-select:none;user-select:none;flex:none;place-items:center;font-weight:800;line-height:1;display:inline-grid;overflow:hidden}.avatar--sm{--avatar-size:2rem}.avatar--lg{--avatar-size:3.5rem}.skeleton{inline-size:var(--sk-w,100%);block-size:var(--sk-h,1rem);border-radius:var(--radius-sm);background:linear-gradient(90deg, color-mix(in srgb, var(--color-text) 8%, transparent) 25%, color-mix(in srgb, var(--color-text) 3%, transparent) 50%, color-mix(in srgb, var(--color-text) 8%, transparent) 75%);background-size:200% 100%;animation:1.4s ease-in-out infinite 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var(--gray-950));grid-area:icon;place-items:center;display:grid}.stat-card__label{font-size:var(--font-size-sm);color:var(--color-text-muted);grid-area:label;font-weight:600}.stat-card__value{font-size:var(--font-size-2xl);grid-area:value;font-weight:800;line-height:1.1}.stat-card__trend{font-size:var(--font-size-xs);color:var(--color-text-muted);grid-area:trend;font-weight:700}.stat-card__trend--up{color:var(--color-success)}.stat-card__trend--down{color:var(--color-danger)}details.dropdown{display:inline-block;position:relative}summary.dropdown__trigger{cursor:pointer;list-style:none}summary.dropdown__trigger::-webkit-details-marker{display:none}.dropdown[open]>.dropdown__trigger{border-color:var(--color-primary);color:var(--color-primary)}.dropdown__menu{z-index:30;min-inline-size:12rem;max-inline-size:calc(100vw - 2 * var(--space-4));padding:var(--space-1);background:var(--color-surface-raised);border:1px solid 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0;border:0;font-weight:500;text-decoration:none;display:flex}.dropdown__item:hover,.dropdown__item:focus-visible{background:var(--color-primary-bg);color:var(--color-text)}.dropdown__item:focus-visible{outline-offset:-3px}.pagination{align-items:center;gap:var(--space-1);flex-wrap:wrap;display:flex}.pagination__item{justify-content:center;align-items:center;gap:var(--space-1);min-inline-size:var(--control-h-sm);min-block-size:var(--control-h-sm);padding-inline:var(--space-2);border-radius:var(--radius-sm);color:var(--color-text-secondary);font-size:var(--font-size-sm);cursor:pointer;transition:background-color var(--dur-fast), color var(--dur-fast);background:0 0;border:2px solid #0000;font-weight:700;text-decoration:none;display:inline-flex}.pagination__item:hover:not([disabled],[aria-current=page]){background:var(--color-primary-bg);color:var(--color-primary)}.pagination__item[aria-current=page]{background:var(--color-primary);color:var(--color-on-primary);box-shadow:0 min(3px, 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var(--dur-fast), box-shadow var(--dur-fast), translate var(--dur-fast);display:flex;position:relative}.answer-option:hover:not(:has(:disabled)){border-color:var(--color-primary)}label.answer-option:active:not(:has(:disabled)){box-shadow:0 1px 0 var(--color-border);translate:0 2px}.answer-option__input{clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;block-size:1px;inline-size:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.answer-option__letter{border:2px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);block-size:2rem;inline-size:2rem;color:var(--color-text-secondary);font-size:var(--font-size-sm);flex:none;place-items:center;font-weight:800;display:grid}.answer-option__text{flex:1;min-inline-size:0}.answer-option:has(.answer-option__input:checked){background:var(--color-primary-bg);border-color:var(--color-primary);box-shadow:0 3px 0 var(--color-primary)}.answer-option:has(.answer-option__input:checked) .answer-option__letter{background:var(--color-primary);border-color:var(--color-primary);color:var(--color-on-primary)}.answer-option:has(:focus-visible){outline:3px solid var(--color-focus);outline-offset:2px}.answer-option.answer-option--correct{background:var(--color-success-bg);border-color:var(--color-success);box-shadow:0 3px 0 var(--color-success)}.answer-option.answer-option--correct .answer-option__letter{background:var(--color-success);border-color:var(--color-success);color:var(--color-on-primary)}.answer-option.answer-option--incorrect{background:var(--color-danger-bg);border-color:var(--color-danger);box-shadow:0 3px 0 var(--color-danger)}.answer-option.answer-option--incorrect .answer-option__letter{background:var(--color-danger);border-color:var(--color-danger);color:var(--color-on-primary)}.answer-option:has(:disabled){cursor:default}.answer-option:has(:disabled):not(.answer-option--correct,.answer-option--incorrect){opacity:.7}.spinner{border:3px solid 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var(--color-border);margin-block-start:var(--space-8);padding-block-start:var(--space-6)}.exam-list__catalog .page-header__title{align-items:center;gap:var(--space-2);display:flex}.exam-card{gap:var(--space-3);flex-direction:column;display:flex}.exam-card__head{justify-content:space-between;align-items:flex-start;gap:var(--space-2);display:flex}.exam-card__title{font-size:var(--font-size-base);margin:0;line-height:1.3}.exam-card__type{align-self:flex-start}.exam-card__stats{gap:var(--space-4);color:var(--color-text-secondary);font-size:var(--font-size-sm);flex-wrap:wrap;display:flex}.exam-card__meta{align-items:center;gap:var(--space-1);color:var(--color-text-secondary);font-size:var(--font-size-sm);display:inline-flex}.exam-card__cta{align-self:flex-end;margin-block-start:auto}.exam-detail__breadcrumb{align-items:center;gap:var(--space-2);font-size:var(--font-size-sm);color:var(--color-text-muted);flex-wrap:wrap;display:flex}.exam-detail__breadcrumb 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.avatar{background:var(--color-surface);color:var(--color-duel)}.challenge-card__vs{justify-content:center;align-items:center;gap:var(--space-3);min-inline-size:0;display:flex}.challenge-card__duel-foot{justify-content:space-between;align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.challenge-form__back{align-items:center;gap:var(--space-1);color:var(--color-text-muted);font-size:var(--font-size-sm);margin-block-end:var(--space-2);text-decoration:none;display:inline-flex}.challenge-form__back:hover{color:var(--color-primary)}.challenge-form__card{gap:var(--space-8);display:grid}.challenge-form__section{gap:var(--space-4);border:0;min-inline-size:0;margin:0;padding:0;display:grid}.challenge-form__legend{float:inline-start;inline-size:100%;font-size:var(--font-size-lg);margin-block-end:var(--space-4);padding:0;font-weight:700}.challenge-form__legend+*{clear:both}.challenge-form__grid{gap:var(--space-3);grid-template-columns:repeat(auto-fill,minmax(11rem,1fr));display:grid}.challenge-form__grid--types{grid-template-columns:repeat(auto-fit,minmax(15rem,1fr))}.challenge-form__option,.challenge-form__trigger{align-items:center;gap:var(--space-3);min-inline-size:0;padding:var(--space-3) 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var(--dur-fast);display:flex}.challenge-form__option:hover,.challenge-form__trigger:hover{border-color:var(--color-primary)}.challenge-form__option[aria-pressed=true],.challenge-form__trigger[aria-expanded=true],.challenge-form__trigger[data-filled]{border-color:var(--color-primary);background:var(--color-primary-bg)}.challenge-form__option--duel[aria-pressed=true]{border-color:var(--color-duel);background:var(--color-duel-bg)}.challenge-form__option-title{flex:1;min-inline-size:0;font-weight:700}.challenge-form__trigger{justify-content:space-between;inline-size:100%}.challenge-form__trigger[aria-expanded=true]>.lucide-chevron-down{transform:rotate(180deg)}.challenge-form__dropdown{position:relative}.challenge-form__exam{align-items:center;gap:var(--space-3);min-inline-size:0;display:flex}.challenge-form__exam-text{gap:var(--space-1);flex:1;min-inline-size:0;display:grid}.challenge-form__exam-title{font-weight:600}.challenge-form__exam-meta{color:var(--color-text-muted);font-size:var(--font-size-sm);font-weight:400}.challenge-form__menu{z-index:30;background:var(--color-surface-raised);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-lg);position:absolute;inset-block-start:calc(100% + var(--space-1));inset-inline:0;overflow:hidden}.challenge-form__search{padding:var(--space-3);border-block-end:1px solid var(--color-border)}.challenge-form__list{max-block-size:18rem;overflow-y:auto}.challenge-form__item{align-items:center;gap:var(--space-3);inline-size:100%;padding:var(--space-3) var(--space-4);color:var(--color-text);text-align:start;cursor:pointer;background:0 0;border:0;display:flex}.challenge-form__item:hover,.challenge-form__item:focus-visible{background:var(--color-primary-bg)}.challenge-form__item:focus-visible{outline-offset:-3px}.challenge-form__item[aria-pressed=true]{background:var(--color-primary-bg);color:var(--color-primary)}.challenge-form__none{padding:var(--space-6);text-align:center;color:var(--color-text-muted);margin:0}.challenge-form__foot{padding:var(--space-2) var(--space-4);border-block-start:1px solid var(--color-border);color:var(--color-text-muted);font-size:var(--font-size-sm);text-align:center;margin:0}.challenge-form__actions{border-block-start:1px solid var(--color-border);justify-content:center;padding-block-start:var(--space-6);display:flex}@media (prefers-reduced-motion:reduce){.challenges__live-dot{animation:none}}.duel{gap:var(--space-6);flex-direction:column;max-inline-size:56rem;margin-inline:auto;display:flex}.duel__header{justify-content:space-between;align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.duel__title{align-items:center;gap:var(--space-2);font-size:var(--font-size-2xl);margin:0;display:flex}.duel__live{border-radius:var(--radius-full);background:var(--color-duel);flex:none;block-size:.75rem;inline-size:.75rem;animation:1.2s ease-in-out infinite duel-live}@keyframes duel-live{50%{opacity:.35}}.duel__id{color:var(--color-text-muted);font-family:var(--font-mono);font-size:var(--font-size-sm)}.duel__stage{text-align:center}.duel__stage>p{margin:0}.duel__stage-label{color:var(--color-duel);font-size:var(--font-size-xs);letter-spacing:.08em;text-transform:uppercase;font-weight:800}.duel__stage-title{font-size:var(--font-size-lg);font-weight:700}.duel__stage-meta{color:var(--color-text-muted);font-size:var(--font-size-sm)}.duel__arena{place-items:center;gap:var(--space-3);grid-template-columns:minmax(0,1fr);display:grid}.duel__arena>:not(.duel__vs){inline-size:100%}@media (width>=640px){.duel__arena{gap:var(--space-6);grid-template-columns:minmax(0,1fr) auto minmax(0,1fr)}}.duel__vs{border-radius:var(--radius-full);background:var(--color-duel);block-size:3.5rem;inline-size:3.5rem;color:var(--color-on-primary);box-shadow:0 4px 0 color-mix(in srgb, var(--color-duel) 60%, var(--gray-950));place-items:center;font-weight:800;display:grid}.duel__actions{align-items:center;gap:var(--space-3);flex-direction:column;display:flex}.duel__notice{color:var(--color-text-secondary);text-align:center;margin:0;font-weight:700}.duel__forfeit:hover:not([disabled]){background:var(--color-danger-bg);color:var(--color-danger)}.duel__rules{padding:var(--space-4) 0 0;border-block-start:1px dashed var(--color-border);color:var(--color-text-muted);font-size:var(--font-size-sm);text-align:center;margin:0;list-style:none}.duel-player{align-items:center;gap:var(--space-2);text-align:center;transition:border-color var(--dur-base), box-shadow var(--dur-base);border-width:2px;flex-direction:column;display:flex}.duel-player>*{max-inline-size:100%;margin:0}.duel-player[data-highlighted=true]{border-color:var(--color-success);box-shadow:0 0 0 4px var(--color-success-bg), var(--shadow-sm)}.duel-player__avatar{--avatar-size:4.5rem}.duel-player[data-rival=true] .duel-player__avatar{background:var(--color-duel-bg);color:var(--color-duel)}.duel-player__name{font-size:var(--font-size-lg)}.duel-player__handle{color:var(--color-text-muted);font-size:var(--font-size-sm)}.duel-score{gap:var(--space-2);inline-size:100%;flex-direction:column;margin-block-start:var(--space-2);display:flex}.duel-score>p{margin:0}.duel-score__value{font-size:var(--font-size-3xl);font-weight:800;line-height:1.1}.duel-score--rival .progress{--progress-color:var(--color-duel)}.duel-score__details{justify-content:center;gap:var(--space-4);font-weight:700;display:flex}.duel-score__details>span,.duel-score__time{justify-content:center;align-items:center;gap:var(--space-1);display:inline-flex}.duel-score__correct{color:var(--color-success)}.duel-score__wrong{color:var(--color-danger)}.duel-score__time{color:var(--color-text-muted);font-size:var(--font-size-sm)}.duel-countdown{z-index:60;background:color-mix(in srgb, var(--gray-950) 88%, transparent);place-items:center;display:grid;position:fixed;inset:0}.duel-countdown__number{color:var(--white);text-shadow:0 0 2rem var(--color-duel);font-size:clamp(5rem,3rem + 12vw,9rem);font-weight:800;line-height:1}.duel-result{--result-color:var(--color-warning);--result-bg:var(--color-warning-bg);gap:var(--space-6);padding:var(--card-pad);background:var(--result-bg);border:2px solid color-mix(in srgb, var(--result-color) 35%, transparent);border-radius:var(--radius-lg);flex-direction:column;display:flex;position:relative}.duel-result[data-result=win]{--result-color:var(--color-success);--result-bg:var(--color-success-bg)}.duel-result[data-result=lose]{--result-color:var(--color-danger);--result-bg:var(--color-danger-bg)}.duel-result__close{position:absolute;inset-block-start:var(--space-3);inset-inline-end:var(--space-3)}.duel-result__header{align-items:center;gap:var(--space-3);text-align:center;flex-direction:column;display:flex}.duel-result__icon{border-radius:var(--radius-full);background:var(--color-surface);block-size:5rem;inline-size:5rem;color:var(--result-color);box-shadow:var(--shadow-md);place-items:center;display:grid}.duel-result__title{font-size:var(--font-size-4xl);color:var(--result-color);margin:0}.duel-result__actions{justify-content:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.duel-waiting{align-items:center;gap:var(--space-4);text-align:center;flex-direction:column;max-inline-size:28rem;margin-inline:auto;display:flex}.duel-waiting>*{margin:0}.duel-waiting>.card{inline-size:100%}.duel-waiting__title{font-size:var(--font-size-3xl)}.duel-waiting__label{justify-content:center;align-items:center;gap:var(--space-2);font-size:var(--font-size-base);color:var(--color-text-secondary);margin:0;display:flex}.duel-waiting__opponent{border-style:dashed}.duel-waiting__playing{margin:var(--space-2) 0 0;color:var(--color-warning);font-weight:700}.friends{max-inline-size:50rem;margin-inline:auto}.friends__list{gap:var(--space-3);flex-direction:column;display:flex}.friends__row{align-items:center;gap:var(--space-4);padding:var(--space-4);display:flex}.friends__row[data-tone=pending]{border-inline-start:4px solid var(--color-warning)}.friends__row[data-tone=sent]{border-style:dashed}.friends__avatar{flex:none;display:inline-flex;position:relative}.friends__avatar .avatar{--avatar-size:3rem}.friends__presence{border-radius:var(--radius-full);border:2px solid 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