.mascot{display:block;margin:0 auto;user-select:none;-webkit-user-drag:none;filter:var(--mascot-figure)}.mascot--idle{animation:mascot-idle 2.6s ease-in-out infinite}@keyframes mascot-idle{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.mascot--correct{animation:mascot-correct .5s cubic-bezier(.34,1.56,.64,1)}@keyframes mascot-correct{0%{transform:translateY(0) scale(1)}40%{transform:translateY(-22px) scale(1.08)}to{transform:translateY(0) scale(1)}}.mascot--wrong{animation:mascot-wrong .45s ease-in-out}@keyframes mascot-wrong{0%,to{transform:translate(0) rotate(0)}20%{transform:translate(-8px) rotate(-6deg)}40%{transform:translate(7px) rotate(5deg)}60%{transform:translate(-5px) rotate(-3deg)}80%{transform:translate(3px) rotate(2deg)}}.mascot--celebrate{animation:mascot-celebrate .9s ease-in-out infinite}@keyframes mascot-celebrate{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-16px) rotate(-8deg)}50%{transform:translateY(0) rotate(0)}75%{transform:translateY(-16px) rotate(8deg)}}@media (prefers-reduced-motion: reduce){.mascot--idle,.mascot--correct,.mascot--wrong,.mascot--celebrate{animation:none}}.question-image-wrap{position:relative;display:flex;justify-content:center;margin:4px 0 20px}.question-image{max-width:220px;width:100%;height:auto;filter:drop-shadow(var(--shadow-sign))}.question-image.skeleton{aspect-ratio:1;height:auto}.question-image-wrap--embedded{position:relative;display:flex;justify-content:center;margin:0;line-height:0}.question-image--embedded{width:100%;height:auto;display:block}.question-image--embedded.skeleton{aspect-ratio:4 / 3;height:auto}.question-image:active{transform:scale(.955);filter:drop-shadow(var(--shadow-sign-press))}.question-image--embedded:active{transform:scale(.985);filter:brightness(.93)}.question-image.skeleton:active,.question-image--embedded.skeleton:active{transform:none;filter:none}@media (prefers-reduced-motion: reduce){.question-image:active,.question-image--embedded:active{transform:none}.image-lightbox{animation-name:fade-in}}.image-lightbox{max-width:92vw;max-height:85vh;width:auto;height:auto;border-radius:var(--radius-lg);filter:var(--shadow-lightbox);animation:pop-in .2s cubic-bezier(.34,1.56,.64,1)}.confetti-wrap{position:absolute;inset:0;overflow:hidden;pointer-events:none;z-index:5;perspective:600px}.confetti-piece{position:absolute;top:-10px;border-radius:2px;opacity:0;animation-name:confetti-fall;animation-timing-function:cubic-bezier(.35,0,.65,1);animation-fill-mode:forwards}.confetti-piece:nth-child(3n){border-radius:50%}@keyframes confetti-fall{0%{transform:translate(0) rotate3d(1,0,.35,0);opacity:0}1%{opacity:1}22%{transform:translate(calc(var(--drift) * .55),58px) rotate3d(1,0,.35,calc(var(--rotate) * .8))}45%{transform:translate(calc(var(--drift) * -.25),118px) rotate3d(1,0,.35,calc(var(--rotate) * 1.7))}68%{transform:translate(calc(var(--drift) * .9),180px) rotate3d(1,0,.35,calc(var(--rotate) * 2.5))}78%{opacity:1}to{transform:translate(var(--drift),260px) rotate3d(1,0,.35,calc(var(--rotate) * 3.2));opacity:0}}@media (prefers-reduced-motion: reduce){.confetti-wrap{display:none}}.avatar-wrap{position:relative;display:inline-flex;align-items:flex-end;justify-content:center;border-radius:var(--radius-md, 16px);background:linear-gradient(180deg,color-mix(in srgb,var(--tg-secondary-bg) 88%,white 12%) 0%,var(--tg-secondary-bg) 58%,color-mix(in srgb,var(--tg-secondary-bg) 90%,black 10%) 100%);box-shadow:inset 0 1px color-mix(in srgb,white 32%,transparent),inset 0 0 0 1px color-mix(in srgb,var(--tg-hint) 22%,transparent),var(--shadow-soft);flex-shrink:0}.avatar-img{width:100%;height:100%;border-radius:inherit;object-fit:contain;object-position:bottom;transition:filter .2s ease,opacity .2s ease}.avatar-accessory{position:absolute;top:-2px;right:-4px;line-height:1;filter:var(--shadow-accessory)}.avatar-lock{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:1.2em;filter:var(--shadow-accessory)}.avatar-ring{box-shadow:inset 0 1px color-mix(in srgb,white 32%,transparent),0 0 0 3px var(--tg-link),0 0 12px color-mix(in srgb,var(--tg-link) 45%,transparent)}:root{--tg-bg: var(--tg-theme-bg-color, #ffffff);--tg-text: var(--tg-theme-text-color, #222222);--tg-hint: var(--tg-theme-hint-color, #6b6b6b);--tg-link: var(--tg-theme-link-color, #2481cc);--tg-button: var(--tg-theme-button-color, #2481cc);--tg-button-text: var(--tg-theme-button-text-color, #ffffff);--tg-secondary-bg: var(--tg-theme-secondary-bg-color, #f0f0f0);--color-correct: #58cc02;--color-correct-dark: #4aa802;--color-wrong: #ff6b6b;--color-wrong-dark: #e85555;--color-xp: #ffc800;--color-streak: #ff9600;--color-heart: #ff5a5f;--color-gold: #ffb300;--color-confetti-pink: #ff6bcb;--color-silver: #c3ccd6;--color-bronze: #cd8544;--exam-accent: #4ec6e0;--exam-accent-bg: #d8f2fa;--exam-accent-text: #177087;--exam-accent-ring: #1f8fae;--border-subtle: color-mix(in srgb, var(--tg-hint) 55%, transparent);--border-control: color-mix(in srgb, var(--tg-text) 50%, transparent);--switch-track: #c6c6c6;--switch-groove: rgba(0, 0, 0, .12);--switch-knob-shadow: rgba(0, 0, 0, .25);--segmented-groove: rgba(0, 0, 0, .1);--switch-on: color-mix(in srgb, var(--color-correct) 60%, var(--tg-text));--progress-groove: rgba(0, 0, 0, .13);--feedback-correct-text: #276b00;--feedback-wrong-text: #b71c1c;--penalty-points-text: #7a5600;--xp-text: #7a5600;--penalty-points-mix: 34%;--topic-percent-mix: 30%;--readiness-delta-mix: 30%;--readiness-delta-down-mix: 22%;--check-ok-mix: 30%;--check-fail-mix: 22%;--error-panel-mix: 22%;--question-tint-mix: 18%;--question-done-mix: 18%;--fs-caption: 13px;--fs-body: 16px;--fs-badge: 18px;--fs-hero: 22px;--app-zoom: 1;--radius-sm: 12px;--radius-md: 16px;--radius-lg: 20px;--radius-xl: 24px;--shadow-soft: 0 2px 6px rgba(0, 0, 0, .07), 0 1px 2px rgba(0, 0, 0, .05);--shadow-card: 0 3px 10px rgba(0, 0, 0, .08);--shadow-modal: 0 14px 36px rgba(0, 0, 0, .2), 0 4px 10px rgba(0, 0, 0, .1);--modal-hairline: rgba(0, 0, 0, .05);--shadow-sign: 0 3px 6px rgba(0, 0, 0, .16);--shadow-sign-press: 0 1px 3px rgba(0, 0, 0, .22);--shadow-app-column: 0 0 40px rgba(0, 0, 0, .15);--mascot-figure: drop-shadow(0 5px 8px rgba(0, 0, 0, .18));--shadow-accessory: drop-shadow(0 1px 1px rgba(0, 0, 0, .35));--shadow-badge: drop-shadow(0 2px 3px rgba(0, 0, 0, .3));--shadow-lightbox: drop-shadow(0 8px 30px rgba(0, 0, 0, .4));--btn-lip: rgba(0, 0, 0, .22)}@media (prefers-color-scheme: dark){:root{--tg-bg: var(--tg-theme-bg-color, #17212b);--tg-text: var(--tg-theme-text-color, #f1f1f1);--tg-hint: var(--tg-theme-hint-color, #8a99a5);--tg-link: var(--tg-theme-link-color, #6ab7ff);--tg-button: var(--tg-theme-button-color, #5288c1);--tg-button-text: var(--tg-theme-button-text-color, #ffffff);--tg-secondary-bg: var(--tg-theme-secondary-bg-color, #232e3c);--border-subtle: color-mix(in srgb, var(--tg-hint) 40%, transparent);--border-control: color-mix(in srgb, var(--tg-text) 50%, transparent);--switch-on: var(--color-correct);--shadow-soft: 0 2px 6px rgba(0, 0, 0, .35), 0 1px 2px rgba(0, 0, 0, .25);--shadow-card: 0 3px 10px rgba(0, 0, 0, .4);--shadow-modal: 0 16px 44px rgba(0, 0, 0, .62), 0 4px 12px rgba(0, 0, 0, .45);--modal-hairline: rgba(255, 255, 255, .18);--shadow-sign: 0 3px 6px rgba(0, 0, 0, .8);--shadow-sign-press: 0 1px 3px rgba(0, 0, 0, .95);--shadow-app-column: 0 0 40px rgba(0, 0, 0, .75);--mascot-figure: drop-shadow(0 0 3px rgba(255, 255, 255, .45)) drop-shadow(0 5px 8px rgba(0, 0, 0, .5));--shadow-accessory: drop-shadow(0 0 2px rgba(255, 255, 255, .45)) drop-shadow(0 1px 1px rgba(0, 0, 0, .6));--shadow-badge: drop-shadow(0 0 3px rgba(255, 255, 255, .45)) drop-shadow(0 2px 3px rgba(0, 0, 0, .55));--shadow-lightbox: drop-shadow(0 0 10px rgba(255, 255, 255, .45)) drop-shadow(0 8px 30px rgba(0, 0, 0, .55));--btn-lip: rgba(255, 255, 255, .14);--switch-track: #45525f;--switch-groove: rgba(0, 0, 0, .2);--switch-knob-shadow: rgba(0, 0, 0, .45);--segmented-groove: rgba(0, 0, 0, .4);--progress-groove: rgba(0, 0, 0, .35);--feedback-correct-text: #7ee02e;--feedback-wrong-text: #ff9494;--penalty-points-text: #ffd166;--xp-text: #ffd166;--penalty-points-mix: 20%;--topic-percent-mix: 14%;--readiness-delta-mix: 14%;--readiness-delta-down-mix: 14%;--check-ok-mix: 14%;--check-fail-mix: 14%;--error-panel-mix: 14%;--question-tint-mix: 10%;--question-done-mix: 14%}}html[data-theme=light]{color-scheme:light;--tg-bg: #ffffff;--tg-text: #222222;--tg-hint: #6b6b6b;--tg-link: #2481cc;--tg-button: #2177bb;--tg-button-text: #ffffff;--tg-secondary-bg: #f0f0f0;--border-subtle: color-mix(in srgb, var(--tg-hint) 38%, transparent);--border-control: color-mix(in srgb, var(--tg-text) 50%, transparent);--switch-on: color-mix(in srgb, var(--color-correct) 60%, var(--tg-text));--shadow-soft: 0 2px 6px rgba(0, 0, 0, .07), 0 1px 2px rgba(0, 0, 0, .05);--shadow-card: 0 3px 10px rgba(0, 0, 0, .08);--shadow-modal: 0 14px 36px rgba(0, 0, 0, .2), 0 4px 10px rgba(0, 0, 0, .1);--modal-hairline: rgba(0, 0, 0, .05);--shadow-sign: 0 3px 6px rgba(0, 0, 0, .16);--shadow-sign-press: 0 1px 3px rgba(0, 0, 0, .22);--shadow-app-column: 0 0 40px rgba(0, 0, 0, .15);--mascot-figure: drop-shadow(0 5px 8px rgba(0, 0, 0, .18));--shadow-accessory: drop-shadow(0 1px 1px rgba(0, 0, 0, .35));--shadow-badge: drop-shadow(0 2px 3px rgba(0, 0, 0, .3));--shadow-lightbox: drop-shadow(0 8px 30px rgba(0, 0, 0, .4));--btn-lip: rgba(0, 0, 0, .22);--switch-track: #c6c6c6;--switch-groove: rgba(0, 0, 0, .12);--switch-knob-shadow: rgba(0, 0, 0, .25);--segmented-groove: rgba(0, 0, 0, .1);--progress-groove: rgba(0, 0, 0, .13);--feedback-correct-text: #276b00;--feedback-wrong-text: #b71c1c;--penalty-points-text: #7a5600;--xp-text: #7a5600;--penalty-points-mix: 34%;--topic-percent-mix: 30%;--readiness-delta-mix: 30%;--readiness-delta-down-mix: 22%;--check-ok-mix: 30%;--check-fail-mix: 22%;--error-panel-mix: 22%;--question-tint-mix: 18%;--question-done-mix: 18%}html[data-theme=dark]{color-scheme:dark;--tg-bg: #17212b;--tg-text: #f1f1f1;--tg-hint: #8a99a5;--tg-link: #6ab7ff;--tg-button: #4979ac;--tg-button-text: #ffffff;--tg-secondary-bg: #232e3c;--border-subtle: color-mix(in srgb, var(--tg-hint) 40%, transparent);--border-control: color-mix(in srgb, var(--tg-text) 50%, transparent);--switch-on: var(--color-correct);--shadow-soft: 0 2px 6px rgba(0, 0, 0, .35), 0 1px 2px rgba(0, 0, 0, .25);--shadow-card: 0 3px 10px rgba(0, 0, 0, .4);--shadow-modal: 0 16px 44px rgba(0, 0, 0, .62), 0 4px 12px rgba(0, 0, 0, .45);--modal-hairline: rgba(255, 255, 255, .18);--shadow-sign: 0 3px 6px rgba(0, 0, 0, .8);--shadow-sign-press: 0 1px 3px rgba(0, 0, 0, .95);--shadow-app-column: 0 0 40px rgba(0, 0, 0, .75);--mascot-figure: drop-shadow(0 0 3px rgba(255, 255, 255, .45)) drop-shadow(0 5px 8px rgba(0, 0, 0, .5));--shadow-accessory: drop-shadow(0 0 2px rgba(255, 255, 255, .45)) drop-shadow(0 1px 1px rgba(0, 0, 0, .6));--shadow-badge: drop-shadow(0 0 3px rgba(255, 255, 255, .45)) drop-shadow(0 2px 3px rgba(0, 0, 0, .55));--shadow-lightbox: drop-shadow(0 0 10px rgba(255, 255, 255, .45)) drop-shadow(0 8px 30px rgba(0, 0, 0, .55));--btn-lip: rgba(255, 255, 255, .14);--switch-track: #45525f;--switch-groove: rgba(0, 0, 0, .2);--switch-knob-shadow: rgba(0, 0, 0, .45);--segmented-groove: rgba(0, 0, 0, .4);--progress-groove: rgba(0, 0, 0, .35);--feedback-correct-text: #7ee02e;--feedback-wrong-text: #ff9494;--penalty-points-text: #ffd166;--xp-text: #ffd166;--penalty-points-mix: 20%;--topic-percent-mix: 14%;--readiness-delta-mix: 14%;--readiness-delta-down-mix: 14%;--check-ok-mix: 14%;--check-fail-mix: 14%;--error-panel-mix: 14%;--question-tint-mix: 10%;--question-done-mix: 14%}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--tg-bg);color:var(--tg-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-tap-highlight-color:transparent}@media (min-width: 640px){body{background:var(--tg-secondary-bg)}#root{max-width:480px;margin:0 auto;min-height:100%;background:var(--tg-bg);box-shadow:var(--shadow-app-column)}}::selection{background:color-mix(in srgb,var(--tg-link) 30%,transparent);color:var(--tg-text)}button{font-family:inherit;font-size:inherit;cursor:pointer;color:inherit;background:none;border:none;user-select:none;-webkit-user-select:none;transition:transform .16s cubic-bezier(.34,1.4,.64,1),opacity .12s ease}.knowledge-body,.sign-card__body{user-select:text;-webkit-user-select:text}button:active:not(:disabled){transform:scale(.96)}@media (hover: hover) and (pointer: fine){button:hover:not(:active):not(:disabled){transform:translateY(-1px)}}button:focus-visible{outline:3px solid var(--tg-link);outline-offset:2px}.app-shell{display:flex;flex-direction:column;height:100vh;height:100dvh;height:var(--app-vh, 100dvh);transition:height .22s ease-out;padding-top:calc(env(safe-area-inset-top) + var(--tg-content-safe-area-top, 0px));box-sizing:border-box}.app-content{flex:1;min-height:0;overflow-y:auto;zoom:var(--app-zoom);padding:16px}.btn-primary{background:var(--tg-button);color:var(--tg-button-text);border:none;border-radius:var(--radius-md);padding:15px 20px;font-size:16px;font-weight:700;width:100%;box-shadow:0 4px 0 var(--btn-lip),var(--shadow-soft);transition:transform .16s cubic-bezier(.34,1.4,.64,1)}.btn-primary:active:not(:disabled){box-shadow:0 1px 0 var(--btn-lip);transform:translateY(3px)}.btn-primary:disabled{opacity:.5;box-shadow:none}.btn-danger{background:color-mix(in srgb,var(--color-wrong) 72%,black)}.btn-success{background:color-mix(in srgb,var(--color-correct) 66%,black)}.btn-secondary{background:var(--tg-secondary-bg);color:var(--tg-text);border:none;border-radius:var(--radius-md);padding:13px 18px;font-size:var(--fs-body);font-weight:600;box-shadow:0 4px color-mix(in srgb,var(--tg-hint) 26%,transparent),var(--shadow-soft);transition:transform .16s cubic-bezier(.34,1.4,.64,1)}.btn-secondary:active:not(:disabled){transform:translateY(3px);box-shadow:0 1px color-mix(in srgb,var(--tg-hint) 26%,transparent);background:color-mix(in srgb,var(--tg-secondary-bg) 80%,black 6%)}.btn-secondary:disabled{opacity:.5;box-shadow:none}.btn-secondary--copied{background:color-mix(in srgb,var(--color-correct) 66%,black);color:var(--tg-button-text)}.vote-btn{padding:9px 14px;font-size:16px;min-height:44px;display:inline-flex;align-items:center;justify-content:center}.btn-secondary.vote-btn--chosen,.btn-secondary.vote-btn--chosen:disabled{opacity:1;background:color-mix(in srgb,var(--tg-link) 16%,var(--tg-secondary-bg));box-shadow:0 0 0 2px var(--tg-link),var(--shadow-soft)}.btn-secondary.vote-btn--muted,.btn-secondary.vote-btn--muted:disabled{opacity:.35}.btn-compact{font-size:var(--fs-caption);padding:9px 16px}.btn-secondary--quiet{font-size:var(--fs-caption);color:color-mix(in srgb,var(--tg-text) 66%,transparent)}.card{background:var(--tg-secondary-bg);color:var(--tg-text);border-radius:var(--radius-lg);padding:15px 17px;margin-bottom:10px;box-shadow:var(--shadow-card);transition:transform .16s cubic-bezier(.34,1.4,.64,1)}button.card:active:not(:disabled){transform:scale(.98);box-shadow:var(--shadow-soft)}.card-title{font-size:var(--fs-body);font-weight:800;line-height:1.25;margin-bottom:8px}.card-desc{font-size:var(--fs-caption);line-height:1.5;color:var(--tg-hint);margin-bottom:10px}.action-tile{display:flex;align-items:center;gap:10px;width:100%;border:none;text-align:left;background:linear-gradient(135deg,color-mix(in srgb,var(--tg-button) 16%,var(--tg-secondary-bg)),color-mix(in srgb,var(--tg-button) 5%,var(--tg-secondary-bg)))}.action-tile>strong{flex:1;min-width:0;line-height:1.3}.smart-review-card{background:color-mix(in srgb,var(--color-xp) 12%,var(--tg-secondary-bg))}.smart-review-card__desc{color:color-mix(in srgb,var(--tg-text) 66%,transparent)}.action-tile>strong:first-letter{font-size:1.5em}.action-tile:after{content:"›";flex-shrink:0;margin-left:auto;font-size:22px;line-height:1;opacity:.55;transition:transform .16s cubic-bezier(.34,1.4,.64,1)}button.action-tile:active:not(:disabled):after{transform:translate(3px)}.alert-badge{border-radius:999px;padding:2px 10px;font-size:13px;background:color-mix(in srgb,var(--color-wrong) 72%,black);color:#fff}.offline-badge{display:inline-flex;align-items:center;border-radius:999px;padding:4px 12px;font-size:var(--fs-caption);font-weight:600;color:var(--tg-hint);background:var(--tg-secondary-bg);box-shadow:inset 0 0 0 1px var(--border-subtle)}.switch-toggle{appearance:none;-webkit-appearance:none;flex-shrink:0;position:relative;width:50px;height:30px;margin:0;border-radius:999px;background:var(--switch-track);box-shadow:inset 0 2px 4px var(--switch-groove);cursor:pointer}.switch-toggle:before{content:"";position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;background:#fff;box-shadow:0 2px 4px var(--switch-knob-shadow);transition:transform .26s cubic-bezier(.34,1.4,.64,1),width .14s ease}.switch-toggle:checked{background:var(--switch-on)}.switch-toggle:checked:before{transform:translate(20px)}.switch-toggle:active:not(:disabled):before{width:28px}.switch-toggle:checked:active:not(:disabled):before{transform:translate(16px)}.switch-toggle:disabled{opacity:.5;cursor:default}.switch-toggle:focus-visible{outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--tg-link) 25%,transparent),inset 0 2px 4px var(--switch-groove)}input:not([type=checkbox]):not([type=radio]):not([type=file]):focus,textarea:not(.mentor-input):focus,select:focus{outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--tg-link) 25%,transparent)}.search-input{width:100%;box-sizing:border-box;margin-bottom:14px;min-height:44px;padding:10px 14px;font-size:var(--fs-body);border-radius:var(--radius-sm);border:1.5px solid var(--border-control);background:var(--tg-bg);color:var(--tg-text)}.search-input:focus{border-color:var(--tg-link)}.form-field{width:100%;box-sizing:border-box;min-height:44px;padding:10px 12px;font-size:var(--fs-body);line-height:1.2;font-family:inherit;border-radius:var(--radius-sm);border:1.5px solid 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