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auto;width:2em;height:2em;border-radius:999px;background:#111827;color:#fff}.dt-guided-expression{display:inline-flex;align-items:center;justify-content:center;gap:clamp(8px,1.2vw,14px);font-size:clamp(1.35rem,3.2vw,2.45rem);font-weight:950;line-height:1;white-space:nowrap}.dt-guided-expression--stacked{display:grid;gap:clamp(8px,1.1vw,12px)}.dt-guided-expression--stacked span{display:inline-flex;align-items:center;justify-content:center;gap:clamp(8px,1.1vw,12px)}.dt-guided-derived{display:inline-grid;place-items:center;min-width:2.2ch;font-weight:950}.dt-guided-input{width:clamp(50px,6vw,72px);height:clamp(44px,5.5vw,62px);font-size:clamp(1.2rem,2.8vw,2rem)}.dt-guided-submit{grid-column:1 / -1;justify-self:center;min-height:clamp(42px,5.4vw,54px)}.dt-check-card{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:clamp(10px,1.7vw,18px);min-height:clamp(64px,8.8vw,86px);padding:clamp(8px,1.4vw,14px) 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#dc262661}.dt-check-expression{justify-self:start;min-width:0;font-size:clamp(1.8rem,5vw,3.4rem);font-weight:950;line-height:1;white-space:nowrap}.dt-check-controls{display:inline-flex;align-items:center;gap:clamp(6px,1vw,10px);white-space:nowrap}.dt-check-btn{display:inline-grid;place-items:center;width:clamp(42px,6vw,62px);height:clamp(42px,6vw,62px);padding:0;border:none;border-radius:999px;background:#ffffff8c;font-size:clamp(1.55rem,4vw,2.6rem);font-weight:950;line-height:1;cursor:pointer}.dt-check-btn.is-check{color:#16a34a}.dt-check-btn.is-x{color:#dc2626}.dt-check-btn:disabled{opacity:.45;cursor:default}.dt-check-card.is-current .dt-check-btn{background:#fff}.dt-check-card.is-selected .dt-check-btn{background:#ffffffad}.dt-check-btn.is-selected-answer{background:#fff;transform:scale(1.08);box-shadow:0 0 0 3px #0f172a38}.dt-bond-list{display:flex;flex-wrap:wrap;gap:6px}.dt-bond-row{display:inline-flex;align-items:center;gap:6px;padding:5px 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.dt-equation-text{font-size:clamp(1.8rem,4.4vw,3rem);margin-bottom:2px}.dt-question-card.has-inline-whiteboard .dt-word-problem{font-size:clamp(.92rem,1.7vw,1.12rem);margin-bottom:2px}.dt-inline-whiteboard{flex:1 1 auto;width:min(100%,1080px);min-height:clamp(360px,58vh,680px);margin:4px auto 0;overflow:hidden;--game-drawing-board-height: 100%;--game-drawing-board-min-height: 0}.dt-inline-whiteboard[hidden]{display:none}.dt-inline-whiteboard .game-drawing-board{width:100%;height:100%;min-height:0;grid-template-columns:1fr;grid-template-rows:auto minmax(0,1fr);gap:4px;overflow:hidden}.dt-inline-whiteboard .game-drawing-board__toolbar{flex-direction:row;flex-wrap:wrap;justify-content:center;padding:4px;gap:4px;order:1}.dt-inline-whiteboard .game-drawing-board__button{min-width:30px;min-height:30px;padding:2px;border-radius:8px;font-size:1rem}.dt-inline-whiteboard .game-drawing-board__surface{box-shadow:none;min-height:0;order:2}.dt-question-card[data-phase=scaffolded] 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.dt-division-trail-marker{background:#22c55e2e;color:#bbf7d0c2}.dt-division-trail-body{display:flex;gap:6px;align-items:baseline;min-width:0}.dt-division-trail-prompt{font-size:.78rem;font-weight:700;line-height:1.35;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.dt-division-trail-answer{color:#d8b4fed1;font-size:.78rem}.dt-answer-form{display:flex;gap:10px;justify-content:center;align-items:stretch}.dt-level3-options{display:grid;grid-template-columns:1fr;gap:10px;margin-top:12px;width:min(100%,360px);margin-inline:auto}.dt-level3-option{padding:12px 14px;border:1px solid rgba(255,255,255,.16);border-radius:12px;background:#ffffff14;color:#fff;font-size:.95rem;font-weight:700;cursor:pointer;transition:transform .15s ease,background .15s ease}.dt-level3-option:hover{transform:translateY(-1px);background:#60b9ff2e}.dt-question-card[data-phase=division] .dt-level3-options{display:flex;justify-content:center;gap:12px;width:min(100%,320px)}.dt-question-card[data-phase=division] .dt-level3-option{display:inline-grid;place-items:center;width:clamp(72px,18vw,92px);height:clamp(64px,15vw,82px);padding:0;border-radius:16px;font-size:clamp(1.2rem,3vw,1.65rem);font-weight:900}.dt-question-card[data-phase=division] .dt-split-option{display:inline-flex;width:auto;min-width:min(30vw,220px);height:auto;min-height:clamp(64px,9vw,84px);padding:8px 18px;border-radius:7px;font-size:clamp(1.8rem,4.8vw,3.2rem)}.dt-level3-actions{display:flex;justify-content:center;margin-top:12px}.dt-question-card.has-inline-whiteboard .dt-level3-actions{justify-content:flex-end;margin:0 auto 4px;width:min(100%,820px)}.dt-question-card.has-inline-whiteboard .dt-hint-btn{padding:5px 10px;font-size:.8rem}.dt-question-card.has-inline-whiteboard .dt-answer-form{margin:0 auto 2px}.dt-question-card.has-inline-whiteboard .dt-answer-input{min-width:0;width:min(42vw,180px)}.dt-hint-btn,.dt-hint-close{padding:10px 16px;border:1px solid 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ease}.dt-submit-btn{padding:12px 24px;border:none;border-radius:12px;background:linear-gradient(135deg,#5b7fff,#3a5fcc);color:#fff;font-size:1rem;font-weight:700;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}.dt-submit-btn:hover{transform:translateY(-1px);box-shadow:0 6px 20px #5a7fff4d}.dt-feedback{margin:12px 0 0;font-size:.95rem;font-weight:600;min-height:1.4em;line-height:1.5}.dt-feedback-actions{display:flex;justify-content:center;margin-top:14px}.dt-feedback-next{min-width:140px}.dt-feedback.correct{color:#8fec8f}.dt-feedback.wrong{color:#ff8a9a}.dt-doors{display:flex;align-items:flex-end;justify-content:center;gap:clamp(12px,4vw,40px);padding:0 16px 16px;width:100%;max-width:900px;flex:0 0 auto;min-height:50%;max-height:75%;z-index:5;position:relative}.dt-door-wrapper{flex:0 0 auto;cursor:pointer;transition:transform .3s ease,filter .2s ease;position:relative}.dt-door-wrapper:hover{transform:scale(1.06);filter:brightness(1.15)}.dt-door-wrapper.selected{animation:doorPulse .5s ease}.dt-door-wrapper.opening{animation:doorOpen .8s ease forwards}.dt-door-img{width:100%;height:100%;object-fit:contain;display:block;filter:drop-shadow(0 8px 24px rgba(0,0,0,.5))}.dt-door-label{position:absolute;bottom:4px;left:50%;transform:translate(-50%);font-size:.8rem;font-weight:700;color:#ffffffd9;white-space:nowrap;text-shadow:0 1px 4px rgba(0,0,0,.8)}.dt-prize-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;z-index:30;background:#000000d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);gap:20px;padding:16px 8px}.dt-prize-img{max-width:min(300px,60vw);max-height:min(300px,40vh);object-fit:contain;animation:prizeAppear .8s cubic-bezier(.34,1.56,.64,1) forwards;filter:drop-shadow(0 0 40px rgba(255,215,0,.4))}.dt-prize-text{font-size:clamp(1.4rem,4vw,2rem);font-weight:800;color:#ffd97a;text-align:center}.dt-prize-stats{font-size:.95rem;color:#ffffffb3}.dt-prize-actions{display:flex;gap:12px;margin-top:8px}.dt-play-again,.dt-go-home{padding:12px 28px;border:none;border-radius:12px;font-size:1rem;font-weight:700;cursor:pointer;transition:transform .15s ease}.dt-play-again{background:linear-gradient(135deg,#5b7fff,#3a5fcc);color:#fff}.dt-go-home{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#e2e8f0}.dt-play-again:hover,.dt-go-home:hover{transform:translateY(-2px)}.dt-start-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;z-index:25;background:#000c;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);gap:16px;text-align:center;padding:24px}.dt-start-title{font-size:clamp(2rem,6vw,3.2rem);font-weight:900;color:#ffd97a;margin:0;text-shadow:0 4px 20px rgba(255,215,0,.3)}.dt-start-desc{font-size:clamp(.95rem,2.5vw,1.15rem);color:#ffffffbf;max-width:400px;line-height:1.5;margin:0}.dt-start-btn{margin-top:8px;padding:14px 36px;border:none;border-radius:14px;background:linear-gradient(135deg,#ffd97a,#e5a830);color:#2a2a3d;font-size:1.1rem;font-weight:800;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease;box-shadow:0 8px 30px #ffd70040}.dt-start-btn:hover{transform:translateY(-2px);box-shadow:0 12px 40px #ffd70059}.dt-coin-pop{position:fixed;top:40%;left:50%;transform:translate(-50%);font-size:1.8rem;font-weight:900;color:#ffd97a;text-shadow:0 0 12px rgba(255,215,0,.6);pointer-events:none;z-index:100;opacity:0}.dt-coin-pop-anim{animation:coinPopUp 1.2s ease-out forwards}@keyframes coinPopUp{0%{opacity:1;transform:translate(-50%) scale(1)}60%{opacity:1;transform:translate(-50%,-60px) scale(1.3)}to{opacity:0;transform:translate(-50%,-100px) scale(.8)}}.dt-advance-toast{position:fixed;top:20%;left:50%;transform:translate(-50%);padding:16px 28px;border-radius:14px;background:linear-gradient(135deg,#1a2e4a,#0f1a2e);border:2px solid #5b7fff;box-shadow:0 0 30px #5b7fff66;color:#fff;font-size:1.1rem;font-weight:700;text-align:center;z-index:100;pointer-events:none;opacity:0}.dt-advance-toast-anim{animation:advanceToastAnim 3s ease-out forwards}@keyframes advanceToastAnim{0%{opacity:0;transform:translate(-50%,20px) scale(.8)}10%{opacity:1;transform:translate(-50%) scale(1.05)}20%{transform:translate(-50%) scale(1)}80%{opacity:1}to{opacity:0;transform:translate(-50%,-20px)}}.dt-prize-coins{font-size:1.1rem;font-weight:700;color:#ffd97a;text-align:center}.dt-prize-keep-release{display:flex;gap:12px;justify-content:center}.dt-keep-btn,.dt-release-btn{padding:10px 22px;border:none;border-radius:10px;font-size:.95rem;font-weight:700;cursor:pointer;transition:transform .15s ease}.dt-keep-btn{background:linear-gradient(135deg,#ffd97a,#e5a830);color:#2a2a3d}.dt-release-btn{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#e2e8f0}.dt-keep-btn:hover,.dt-release-btn:hover{transform:translateY(-2px)}.dt-keep-btn:disabled,.dt-release-btn:disabled{opacity:.7;cursor:default;transform:none}.dt-cavern-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;z-index:35;background:#000000d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);padding:16px;overflow-y:auto;-webkit-overflow-scrolling:touch}.dt-cavern-panel{max-width:500px;width:100%;max-height:80vh;overflow-y:auto;background:linear-gradient(135deg,#3a3a5c,#2a2a3d);border:1px solid rgba(255,215,0,.2);border-radius:16px;padding:24px;box-shadow:0 20px 60px #00000080}.dt-cavern-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.dt-cavern-header h2{font-size:1.3rem;color:#ffd97a;margin:0}.dt-cavern-close{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);border-radius:8px;color:#e2e8f0;font-size:1.1rem;padding:6px 10px;cursor:pointer}.dt-cavern-close:hover{background:#fff3}.dt-cavern-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:12px}.dt-cavern-item{width:100%;aspect-ratio:1;object-fit:contain;border-radius:10px;background:#ffffff0d;border:1px solid rgba(255,215,0,.15);padding:6px}.dt-cavern-empty{text-align:center;color:#ffffff80;font-size:.9rem;padding:24px 0}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-5px)}80%{transform:translate(5px)}}@keyframes doorPulse{0%{transform:scale(1)}50%{transform:scale(1.12)}to{transform:scale(1)}}@keyframes doorOpen{0%{transform:scaleX(1);opacity:1}50%{transform:scaleX(.05);opacity:.6}to{transform:scaleX(0);opacity:0}}@keyframes prizeAppear{0%{transform:scale(0) rotate(-20deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}@media(max-width:600px){.dt-split-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.dt-doors{gap:10px}.dt-question-card{padding:20px 16px}.dt-answer-form{flex-direction:column;align-items:center}.dt-submit-btn{width:100%}}@media(max-height:500px){.dt-doors{min-height:45%;max-height:65%}.dt-question-card{padding:16px}}