body.app-loading button[onclick]{opacity:.55;cursor:wait;pointer-events:none}body.app-loading::after{content:'';position:fixed;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--brand,#0e6f68),transparent);animation:app-loading-bar 1s ease-in-out infinite;z-index:9999}@keyframes app-loading-bar {
    0% {
        transform: translateX(-100%)
    }
    100% {
        transform: translateX(100%)
    }
}:root{--brand:#0e6f68;--brand2:#0a544e;--brand-rgb:14 , 111 , 104;--green:#22c55e;--red:#ef4444;--yellow:#f59e0b;--orange:#f97316;--radius:12px;--radius-sm:10px;--font:'Inter' , system-ui , -apple-system , 'Segoe UI' , sans-serif;--font-serif:'Source Serif 4' , Georgia , 'Times New Roman' , serif;--safe-bottom:env(safe-area-inset-bottom,0)}*,*::before,*::after{box-sizing:border-box}body{font-family: var(--font);min-height:100vh;padding-bottom: calc(60px + var(--safe-bottom))}.view{display:none}.view.active{display:block;animation:view-enter .35s cubic-bezier(.16,1,.3,1)}@keyframes view-enter {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}@media (prefers-reduced-motion:reduce){.view.active{animation:none}*{scroll-behavior:auto!important}}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:1030;background:var(--bs-body-bg);border-top:1px solid var(--bs-border-color);display:flex;padding-bottom:var(--safe-bottom)}.bottom-nav .bn-item{flex:1;display:flex;flex-direction:column;align-items:center;padding:8px 4px;cursor:pointer;color:var(--bs-secondary-color);font-size:.62rem;font-weight:500;text-transform:uppercase;letter-spacing:.04em;border:none;background:none;transition:.15s;gap:2px;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.bottom-nav .bn-item i{font-size:1.3rem;line-height:1}.bottom-nav .bn-item.active{color:var(--brand)}.bottom-nav .bn-item .bn-badge{position:absolute;top:4px;right:calc(50% - 16px);background:var(--red);color:#fff;font-size:.55rem;padding:1px 4px;border-radius:99px;min-width:14px;text-align:center;line-height:1.4}@media (min-width:768px){.bottom-nav{display:none}}.top-nav{display:none}@media (min-width:768px){.top-nav{display:flex}body{padding-bottom:20px}}.desk-nav-tabs{display:none}@media (min-width:768px){.desk-nav-tabs{display:flex;gap:4px;align-items:center}}.desk-nav-tab{display:flex;align-items:center;gap:6px;padding:6px 14px;border-radius:8px;border:none;background:none;color:var(--bs-secondary-color);font-size:.85rem;font-weight:500;cursor:pointer;transition:background-color .15s , color .15s;white-space:nowrap}.desk-nav-tab:hover{background:var(--bs-tertiary-bg);color:var(--bs-body-color)}.desk-nav-tab.active{background:rgba(14,111,104,.12);color:var(--brand);font-weight:600}.desk-nav-tab .badge{font-size:.6rem;padding:2px 5px}.brand-home-link{border:none;background:none;padding:0;cursor:pointer;display:inline-flex;align-items:center;gap:0;transition:opacity .15s}.brand-home-link:hover{opacity:.8}.surface{background:var(--bs-body-bg);border:1px solid var(--bs-border-color);border-radius:var(--radius);transition:box-shadow .2s ease , border-color .2s ease}@media (hover:hover){.surface:hover{box-shadow:0 2px 14px rgba(0,0,0,.06)}}.surface-2{background:var(--bs-tertiary-bg);border:1px solid var(--bs-border-color);border-radius:var(--radius-sm)}.stat-card{border-radius:var(--radius-sm);padding:12px 10px;text-align:center;border:1px solid var(--bs-border-color);background:var(--bs-tertiary-bg);animation:stat-card-in .4s cubic-bezier(.16,1,.3,1) backwards}.stat-val{font-size:1.5rem;font-weight:800;line-height:1}.stat-lbl{font-size:.62rem;text-transform:uppercase;letter-spacing:.06em;color:var(--bs-secondary-color);margin-top:2px}.stat-card:nth-child(1) {animation-delay:.02s}.stat-card:nth-child(2) {animation-delay:.07s}.stat-card:nth-child(3) {animation-delay:.12s}.stat-card:nth-child(4) {animation-delay:.17s}@keyframes stat-card-in {
    from {
        opacity: 0;
        transform: scale(.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}@media (prefers-reduced-motion:reduce){.stat-card{animation:none}}.prog{height:8px;border-radius:99px;background:var(--bs-border-color);overflow:hidden;position:relative}.prog-bar{height:100%;border-radius:99px;background:var(--brand);transition:width .6s cubic-bezier(.16,1,.3,1);position:relative;overflow:hidden}.prog-bar::after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:none}@keyframes prog-shine {
    to {
        transform: translateX(100%);
    }
}@media (prefers-reduced-motion:reduce){.prog-bar::after{animation:none}.prog-bar{transition:none}}.mode-card{border:2px solid var(--bs-border-color);border-radius:var(--radius-sm);padding:14px 10px;cursor:pointer;text-align:center;transition:border-color .15s , background-color .15s , transform .12s;background:var(--bs-tertiary-bg);user-select:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.mode-card:active{transform:scale(.96)}@media (hover:hover){.mode-card:hover{border-color:var(--brand);transform:translateY(-2px)}}.mode-card.active{border-color:var(--brand);background:rgba(14,111,104,.08);animation:mode-card-pop .3s cubic-bezier(.34,1.56,.64,1)}.mode-card.exam-mode.active{border-color:var(--red);background:rgba(239,68,68,.07)}.mode-card .mode-icon{font-size:1.5rem;margin-bottom:4px}.mode-card .mode-title{font-size:.78rem;font-weight:600;line-height:1.2}.mode-card .mode-count{font-size:.65rem;color:var(--bs-secondary-color);margin-top:4px;display:block}.mode-card.active .mode-count{color:var(--brand)}@keyframes mode-card-pop {
    0% {
        transform: scale(1);
    }
    40% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}@media (prefers-reduced-motion:reduce){.mode-card.active{animation:none}}.cat-chip{display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:20px;font-size:.76rem;border:1.5px solid var(--bs-border-color);background:var(--bs-tertiary-bg);color:var(--bs-secondary-color);cursor:pointer;transition:border-color .12s , background-color .12s;user-select:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation}@media (hover:hover){.cat-chip:hover{border-color:var(--brand)}}.cat-chip.active{border-color:var(--brand);background:rgba(14,111,104,.1);color:var(--bs-body-color);font-weight:500}.option-btn{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:var(--bs-tertiary-bg);border:2px solid var(--bs-border-color);border-radius:var(--radius-sm);padding:13px 16px;margin:8px 0;color:var(--bs-body-color);font-size:.95rem;line-height:1.45;cursor:pointer;transition:border-color .15s , background-color .15s , transform .1s;min-height:48px;-webkit-tap-highlight-color:transparent;touch-action:manipulation;user-select:none}.option-btn:active{transform:scale(.985)}.option-btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.option-btn:focus:not(:focus-visible) {outline:none}@media (hover:hover){.option-btn:hover{border-color:var(--brand)}}.option-btn.selected{border-color:var(--brand);background:rgba(14,111,104,.1)}.option-btn.selected::after{content:"\f26a";font-family:"bootstrap-icons";margin-left:auto;flex-shrink:0;color:var(--brand);font-size:1.1rem}.option-btn.correct{border-color:var(--green);background:rgba(34,197,94,.1);color:var(--green);font-weight:600}.option-btn.wrong{border-color:var(--red);background:rgba(239,68,68,.1);color:var(--red)}.option-btn.missed{border-color:var(--yellow);background:rgba(245,158,11,.08);color:var(--yellow);font-weight:600;border-style:dashed}@media (min-width:768px){.option-btn{padding:15px 20px;font-size:1rem}}@media (hover:hover) and (min-width:768px){.option-btn:hover{box-shadow:0 2px 10px rgba(14,111,104,.12)}}.answer-ta{width:100%;min-height:120px;padding:14px;background:var(--bs-tertiary-bg);border:2px solid var(--bs-border-color);border-radius:var(--radius-sm);color:var(--bs-body-color);font-family: var(--font);font-size:.95rem;resize:vertical}.answer-ta:focus{outline:none;border-color:var(--brand)}.diff-btn{flex:1;padding:11px 6px;border-radius:8px;border:2px solid;font-size:.82rem;font-weight:600;cursor:pointer;transition:transform .1s , box-shadow .15s;text-align:center;min-height:44px;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.diff-btn:active{transform:scale(.97)}.diff-btn.easy{border-color:var(--green);color:var(--green);background:rgba(34,197,94,.08)}.diff-btn.medium{border-color:var(--yellow);color:var(--yellow);background:rgba(245,158,11,.08)}.diff-btn.hard{border-color:var(--red);color:var(--red);background:rgba(239,68,68,.08)}@media (hover:hover){.diff-btn:hover.easy{box-shadow:0 2px 8px rgba(34,197,94,.2)}.diff-btn:hover.medium{box-shadow:0 2px 8px rgba(245,158,11,.2)}.diff-btn:hover.hard{box-shadow:0 2px 8px rgba(239,68,68,.2)}}.q-card{border:1px solid var(--bs-border-color);border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:10px;cursor:pointer;transition:border-color .15s , box-shadow .15s , transform .1s;background:var(--bs-body-bg);-webkit-tap-highlight-color:transparent;touch-action:manipulation}.q-card:active{transform:scale(.99)}@media (hover:hover){.q-card:hover{border-color:var(--brand);box-shadow:0 4px 16px rgba(14,111,104,.15);transform:translateY(-1px)}}.q-card-text{font-size:.9rem;font-weight:500;margin-bottom:7px;line-height:1.45}.q-card-meta{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.touch-btn{min-height:44px;min-width:44px;-webkit-tap-highlight-color:transparent;touch-action:manipulation}@media (min-width:992px){#view-quiz .surface{padding:24px 28px!important}#view-quiz #q-text{font-size:1.05rem}}#view-quiz .surface.q-fade-out{opacity:0;transform:translateY(4px);transition:opacity .14s ease , transform .14s ease}#view-quiz .surface.q-fade-in{animation:q-fade-in-anim .25s ease-out}@keyframes q-fade-in-anim {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}@media (prefers-reduced-motion:reduce){#view-quiz .surface.q-fade-out{transition:none;opacity:1;transform:none}#view-quiz .surface.q-fade-in{animation:none}}.expl-panel{border:1px solid var(--bs-border-color);border-radius:var(--radius-sm);margin-top:16px;overflow:hidden}.expl-header{display:flex;align-items:center;justify-content:space-between;padding:11px 14px;background:rgba(14,111,104,.06);border-bottom:1px solid var(--bs-border-color);cursor:pointer}.expl-body{padding:18px;display:none;font-size:.9rem;line-height:1.78}.expl-body.open{display:block}.expl-body ul{padding-left:0;list-style:none;margin:4px 0 8px}.expl-body ul li{padding:3px 0 3px 16px;position:relative}.expl-body ul li::before{content:"›";position:absolute;left:0;color:var(--brand);font-weight:700}.expl-body strong{color:var(--bs-emphasis-color)}.expl-body em{color:#a78bfa}.diag-wrap{background:var(--bs-tertiary-bg);border:1px solid var(--bs-border-color);border-radius:var(--radius-sm);padding:16px;margin:14px 0;overflow-x:auto;text-align:center}.diag-wrap svg{max-width:100%;height:auto}#exam-timer{font-size:1.8rem;font-weight:900;font-family:monospace;color:var(--red)}#exam-timer.warning{animation:blink .8s infinite}@keyframes blink {
    50% {
        opacity: .35
    }
}.cat-tree-item{display:flex;align-items:center;gap:8px;padding:8px 10px 8px 22px;border-radius:8px;cursor:pointer;font-size:.8rem;transition:background-color .12s;min-height:40px}.cat-tree-item:hover{background:var(--bs-tertiary-bg)}.cat-tree-item.active{background:rgba(14,111,104,.12);color:var(--brand);font-weight:500}.cat-tree-group-header{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;cursor:pointer;font-size:.8rem;font-weight:600;color:var(--bs-secondary-color);transition:background-color .12s , color .12s;min-height:40px}.cat-tree-group-header:hover{background:var(--bs-tertiary-bg);color:var(--bs-body-color)}.cat-tree-children{display:none}.cat-tree-children.open{display:block}.browser-sidebar{position:sticky;top:80px;max-height:calc(100vh - 100px);overflow-y:auto;scrollbar-width:thin}.modal-option{display:flex;align-items:flex-start;gap:10px;padding:10px 13px;border-radius:8px;margin-bottom:7px;font-size:.9rem;line-height:1.5}.modal-option.correct{background:rgba(34,197,94,.08);border:1px solid rgba(34,197,94,.25)}.modal-option.wrong{background:rgba(239,68,68,.05);border:1px solid rgba(239,68,68,.15)}.streak-pill{background:rgba(245,158,11,.12);border:1px solid rgba(245,158,11,.3);color:var(--yellow);border-radius:99px;padding:3px 11px;font-size:.78rem;font-weight:600;white-space:nowrap;animation:streak-breathe 2.4s ease-in-out infinite}@keyframes streak-breathe {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(245, 158, 11, 0);
    }
    50% {
        box-shadow: 0 0 0 4px rgba(245, 158, 11, .08);
    }
}@media (prefers-reduced-motion:reduce){.streak-pill{animation:none}}.sr-badge{background:rgba(14,111,104,.15);color:#a78bfa;border:1px solid rgba(14,111,104,.3);border-radius:99px;padding:1px 8px;font-size:.68rem}.model-badge{font-size:.62rem;padding:1px 6px;border-radius:4px;background:var(--bs-tertiary-bg);color:var(--bs-secondary-color)}.cached-ok{color:var(--green);font-size:.72rem}.flashcard-scene{perspective:1000px;width:100%;max-width:480px;margin:0 auto;height:280px}.flashcard{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,0,.2,1) , filter .55s ease;cursor:pointer;-webkit-tap-highlight-color:transparent}.flashcard:active{filter:brightness(.97)}.flashcard.flipped{transform:rotateY(180deg)}@media (prefers-reduced-motion:reduce){.flashcard{transition:none}}.flashcard-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:18px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:28px 24px;text-align:center;border:1.5px solid var(--bs-border-color);box-shadow:0 4px 24px rgba(0,0,0,.18)}.flashcard-front{background:var(--bs-body-bg)}.flashcard-back{background:var(--bs-tertiary-bg);transform:rotateY(180deg)}.flashcard-term{font-size:1.3rem;font-weight:800;line-height:1.25;margin-bottom:10px}.flashcard-hint{font-size:.78rem;color:var(--bs-secondary-color);margin-top:8px}.flashcard-def{font-size:.88rem;line-height:1.65;overflow-y:auto;max-height:200px}.flashcard-cat{font-size:.65rem;text-transform:uppercase;letter-spacing:.08em;color:var(--brand);font-weight:600;margin-bottom:12px}.fc-swipe-hint{font-size:.72rem;color:var(--bs-secondary-color);text-align:center;margin-top:12px}.fc-rating{display:flex;gap:10px;justify-content:center;margin-top:14px}.fc-rating .btn{flex:1;max-width:120px;min-height:44px}.btn{transition:transform .1s ease , box-shadow .15s ease , background-color .15s ease , border-color .15s ease;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.btn:active{transform:scale(.97)}@media (prefers-reduced-motion:reduce){.btn{transition:background-color .15s ease , border-color .15s ease}.btn:active{transform:none}}.glossar-letter-header{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--brand);padding:6px 0 2px;margin-top:12px;border-bottom:1px solid var(--bs-border-color)}.glossar-item{padding:12px 0;border-bottom:1px solid var(--bs-border-color);cursor:pointer;transition:padding-left .15s ease}@media (hover:hover){.glossar-item:hover{padding-left:6px}}.glossar-term{font-weight:600;font-size:.92rem;margin-bottom:3px}.glossar-short{font-size:.8rem;color:var(--bs-secondary-color);line-height:1.45}.glossar-expand{display:none;margin-top:10px;font-size:.85rem;line-height:1.7;overflow:hidden}.glossar-expand.open{display:block;animation:glossar-reveal .25s cubic-bezier(.16,1,.3,1)}@keyframes glossar-reveal {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}@media (prefers-reduced-motion:reduce){.glossar-expand.open{animation:none}}.glossar-alpha-nav{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:12px}.glossar-alpha-btn{width:30px;height:30px;border-radius:6px;border:1px solid var(--bs-border-color);background:var(--bs-tertiary-bg);font-size:.78rem;font-weight:600;cursor:pointer;transition:background-color .12s , color .12s;display:flex;align-items:center;justify-content:center;-webkit-tap-highlight-color:transparent}.glossar-alpha-btn:hover,.glossar-alpha-btn.active{background:var(--brand);color:#fff;border-color:var(--brand)}.chat-msg{max-width:85%;padding:10px 14px;border-radius:12px;font-size:.88rem;line-height:1.6}.chat-msg.user{background:rgba(14,111,104,.12);border:1px solid rgba(14,111,104,.2);align-self:flex-end}.chat-msg.bot{background:var(--bs-tertiary-bg);border:1px solid var(--bs-border-color);align-self:flex-start}.chat-msg.typing{opacity:.6;font-style:italic}.chat-chip-btn{cursor:pointer;transition:background-color .1s}@media (hover:hover){.chat-chip-btn:hover{background:rgba(14,111,104,.2)!important}}.icb-item{display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:7px;margin-bottom:3px;cursor:pointer;border:1px solid transparent;transition:background-color .12s , border-color .12s;font-size:.78rem}.icb-item:hover{background:var(--bs-tertiary-bg);border-color:currentColor!important}.icb-item.active{background:rgba(14,111,104,.08)}.icb-code{font-family:monospace;font-size:.68rem;flex-shrink:0;font-weight:600}.icb-name{flex-grow:1}.tts-btn{padding:4px 8px;line-height:1;border-radius:6px}.tts-btn.active{background:var(--brand);color:#fff;border-color:var(--brand)}.tts-btn i{font-size:.9rem}.status-dot{display:inline-block;width:9px;height:9px;border-radius:50%}.fade-btn{transition:opacity .15s;opacity:.75}.fade-btn:hover{opacity:1}@media (max-width:575px){.container-xl{padding-left:12px;padding-right:12px}.q-card{padding:12px 13px}h5{font-size:1rem}}.empty-state{text-align:center;padding:40px 20px;color:var(--bs-secondary-color);animation:stat-card-in .4s cubic-bezier(.16,1,.3,1)}.empty-state i{font-size:2.2rem;opacity:.4;display:block;margin-bottom:10px}@media (prefers-reduced-motion:reduce){.empty-state{animation:none}}#daily-banner{border-left:4px solid currentColor}.q-card-skeleton{border:1px solid var(--bs-border-color);border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:10px;background:var(--bs-body-bg)}.skel-line{height:12px;border-radius:6px;margin-bottom:8px;background:linear-gradient(90deg,var(--bs-tertiary-bg) 25%,var(--bs-border-color) 37%,var(--bs-tertiary-bg) 63%);background-size:400% 100%;animation:skel-shimmer 1.4s ease-in-out infinite}.skel-line-wide{width:85%}.skel-line-narrow{width:45%;height:9px;margin-bottom:0}@keyframes skel-shimmer {
    0% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
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