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1fr}.leitner-boxes{grid-template-columns:1fr}.stat-number{font-size:1.6rem}.review-word{font-size:1.5rem}}@keyframes cardFlip{0%{transform:rotateY(0)}to{transform:rotateY(180deg)}}.flip-card{perspective:1000px}.flip-card-inner{transition:transform .6s;transform-style:preserve-3d}.flip-card.flipped .flip-card-inner{transform:rotateY(180deg)}.categories-slider-container{position:relative;margin:1rem auto;max-width:100%;overflow:hidden}.categories-slider{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;gap:1rem;padding:.5rem .75rem;-webkit-overflow-scrolling:touch;scrollbar-width:none;-ms-overflow-style:none}.categories-slider::-webkit-scrollbar{display:none}.category-slide{scroll-snap-align:start;flex:0 0 auto;padding:0;background:transparent;border:none}.category-card{display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:.75rem;background:var(--card-bg);border-radius:1rem;border:2px solid transparent;transition:all .3s 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ease;z-index:10;box-shadow:var(--shadow-sm)}.slider-nav.prev{left:-12px}.slider-nav.next{right:-12px}.slider-nav:hover{background:var(--primary);color:#fff;transform:translateY(-50%) scale(1.05)}.slider-nav:active{transform:translateY(-50%) scale(.95)}@media(min-width:1280px){.category-slide{width:calc(12.5% - .875rem);min-width:110px;max-width:130px}.category-image{width:100%;height:auto;aspect-ratio:1 / 1}.categories-slider-container:hover .slider-nav{display:flex}}@media(min-width:1024px)and (max-width:1279px){.category-slide{width:calc(14.285% - .857rem);min-width:100px;max-width:120px}.category-card{padding:.6rem}.categories-slider-container:hover .slider-nav{display:flex}}@media(min-width:769px)and (max-width:1023px){.category-slide{width:calc(16.666% - .833rem);min-width:90px;max-width:110px}.category-card{padding:.6rem .4rem}}@media(min-width:481px)and (max-width:768px){.category-slide{width:calc(25% - .75rem);min-width:85px;max-width:100px}.slider-nav{display:flex;opacity:.6;width:30px;height:30px}.slider-nav.prev{left:-8px}.slider-nav.next{right:-8px}}@media(min-width:481px)and (max-width:768px){.slider-nav{opacity:.8}}@media(max-width:480px){.category-slide{width:calc(33.333% - .667rem);min-width:80px;max-width:95px}.slider-nav{display:flex;opacity:.7;width:28px;height:28px;font-size:1rem}.slider-nav.prev{left:-6px}.slider-nav.next{right:-6px}}@media(max-width:380px){.category-slide{width:calc(50% - .5rem);min-width:70px;max-width:85px}.category-name{font-size:.65rem}}.category-card:active{transform:scale(.96);transition:transform .08s linear}body.dark .category-card{background:var(--card-bg)}body.dark .slider-nav{background:var(--card-bg);border-color:var(--border);color:var(--primary)}body.dark .slider-nav:hover{background:var(--primary);color:#fff}.category-image{background:var(--border)}.category-image{object-fit:cover;object-position:center}@media(min-width:1024px){.categories-slider{justify-content:flex-start}}.category-name a{text-decoration:none;color:inherit}.category-name a:hover{text-decoration:none}.mobile-tab-bar{display:none}@media(max-width:768px){:root{--mobile-tab-bar-offset: calc(3.65rem + env(safe-area-inset-bottom, 0px)) }html:has(.mobile-tab-bar){overflow-x:clip}body:has(.mobile-tab-bar){overflow-x:clip;padding-bottom:var(--mobile-tab-bar-offset)}body:has(.site-footer):has(.mobile-tab-bar){min-width:0}body:has(.site-footer):has(.mobile-tab-bar) .site-footer,body:has(.site-footer):has(.mobile-tab-bar) .header,body:has(.site-footer):has(.mobile-tab-bar) .container,body:has(.site-footer):has(.mobile-tab-bar) main{min-width:0;max-width:100%}.mobile-tab-bar{--tab-index: 0;display:block;position:fixed;inset-inline:0;bottom:0;z-index:1000;width:100%;max-width:100%;box-sizing:border-box;padding:.4rem max(.5rem,env(safe-area-inset-left,0px)) calc(.5rem + env(safe-area-inset-bottom,0px)) max(.5rem,env(safe-area-inset-right,0px));pointer-events:none;overflow:hidden;contain:layout style;animation:mobileTabBarEnter .45s cubic-bezier(.22,1,.36,1) both}.mobile-tab-bar[data-active=home]{--tab-index: 0}.mobile-tab-bar[data-active=vocabulary]{--tab-index: 1}.mobile-tab-bar[data-active=auth]{--tab-index: 2}@keyframes mobileTabBarEnter{0%{opacity:0;transform:translateY(100%)}to{opacity:1;transform:translateY(0)}}.mobile-tab-bar__surface{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:stretch;width:100%;max-width:28rem;margin:0 auto;padding:.3rem;border-radius:1.1rem;background:color-mix(in srgb,var(--card-bg) 92%,transparent);border:1px solid color-mix(in srgb,var(--border) 85%,transparent);box-shadow:0 -2px 16px #0f172a1a;-webkit-backdrop-filter:blur(14px) saturate(1.15);backdrop-filter:blur(14px) saturate(1.15);pointer-events:auto;overflow:hidden;isolation:isolate}html.dark .mobile-tab-bar__surface,body.dark .mobile-tab-bar__surface{background:color-mix(in srgb,var(--card-bg) 82%,#0f172a);box-shadow:0 -2px 20px #00000059}.mobile-tab-bar__indicator{position:absolute;top:.3rem;left:.3rem;width:calc((100% - .6rem) / 3);height:calc(100% - .6rem);border-radius:.85rem;background:linear-gradient(145deg,var(--primary) 0%,var(--primary-dark) 100%);box-shadow:0 2px 10px #8b5cf659;transform:translate(calc(var(--tab-index) * 100%));transition:transform .38s cubic-bezier(.34,1.35,.64,1);z-index:0;pointer-events:none}.mobile-tab-bar__item{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.15rem;min-width:0;padding:.5rem .2rem .4rem;text-decoration:none;color:var(--text-muted);font-size:clamp(.58rem,2.6vw,.68rem);font-weight:600;letter-spacing:.01em;border-radius:.85rem;-webkit-tap-highlight-color:transparent;touch-action:manipulation;user-select:none;transition:color .25s ease}.mobile-tab-bar__item:nth-child(2){grid-column:1;grid-row:1}.mobile-tab-bar__item:nth-child(3){grid-column:2;grid-row:1}.mobile-tab-bar__item:nth-child(4){grid-column:3;grid-row:1}.mobile-tab-bar__item.is-active{color:#fff}.mobile-tab-bar__icon{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:1.25rem;height:1.25rem;transition:transform .3s cubic-bezier(.34,1.35,.64,1)}.mobile-tab-bar__icon svg{width:100%;height:100%}.mobile-tab-bar__item.is-active .mobile-tab-bar__icon{transform:translateY(-1px) scale(1.06)}.mobile-tab-bar__label{display:block;max-width:100%;line-height:1.1;text-align:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mobile-tab-bar__label-short{display:none}@media(max-width:360px){.mobile-tab-bar__label-full{display:none}.mobile-tab-bar__label-short{display:block}}@media(prefers-reduced-motion:reduce){.mobile-tab-bar{animation:none}.mobile-tab-bar__indicator{transition:transform .12s ease}.mobile-tab-bar__item.is-active .mobile-tab-bar__icon{transform:none}}}