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var(--accent-line);background:var(--accent-soft)}.score-ribbon .game-session-time+div{border-left:0}.score-ribbon .game-session-time strong{font-variant-numeric:tabular-nums}.score-ribbon .game-session-time.is-low{border-color:var(--yellow-line);background:var(--yellow-soft);color:var(--warning-text)}.choice-game,.number-line-game,.array-builder-game,.memory-game,.combo-play,.combo-setup{width:min(980px,100% - 32px);margin:0 auto;padding:24px 0 56px}.number-line-stage{grid-template-columns:minmax(230px,.62fr) minmax(0,1.38fr);gap:18px;margin-top:20px;display:grid}.number-line-prompt,.number-line-board{border:1px solid var(--line);background:var(--white);border-radius:10px;min-width:0}.number-line-prompt{padding:28px}.number-line-equation{border:1px solid var(--accent-line);background:var(--accent-soft);border-radius:8px;place-items:center;min-height:112px;margin-top:28px;font-size:clamp(38px,6vw,58px);font-weight:850;display:grid}.number-line-prompt>p{color:var(--muted);margin:22px 0 0;font-size:15px;line-height:1.5}.number-line-prompt .question-progress strong{white-space:nowrap}.number-line-board{padding:24px 22px 18px;overflow:hidden}.number-line-scroll-hint{border:1px solid var(--yellow-line);background:var(--yellow-soft);min-height:40px;color:var(--warning-text);text-align:center;border-radius:7px;justify-content:center;align-items:center;gap:6px;margin:0 0 8px;padding:8px 12px;font-size:12px;display:flex}.number-line-scroll-hint svg{flex:none;width:20px;height:20px}.number-line-scroll-hint strong{font-weight:850}.number-line-scroll-controls{grid-template-columns:44px minmax(0,1fr) 44px;align-items:stretch;gap:8px;display:grid}.number-line-scroll-controls>button{border:1px solid var(--accent-line);background:var(--accent-soft);min-width:44px;min-height:44px;color:var(--accent);cursor:pointer;border-radius:8px;place-items:center;padding:0;display:grid}.number-line-scroll-controls>button:hover{border-color:var(--accent);background:var(--accent-soft)}.number-line-scroll-controls>button:focus-visible{outline:3px solid var(--focus-soft);outline-offset:2px}.number-line-scroll-controls>button svg{width:24px;height:24px}.number-line-scroll{overscroll-behavior-inline:contain;border:1px solid var(--surface-disabled);background:linear-gradient(90deg, var(--shadow-color), transparent 20px), linear-gradient(270deg, var(--shadow-color), transparent 20px), var(--accent-soft);scrollbar-color:var(--muted) var(--accent-soft);scrollbar-width:auto;scroll-snap-type:x proximity;touch-action:pan-x;border-radius:8px;width:100%;padding:10px 4px 12px;overflow-x:auto}.number-line-scroll:focus-visible{outline:3px solid var(--focus-soft);outline-offset:2px}.number-line-scroll::-webkit-scrollbar{height:12px}.number-line-scroll::-webkit-scrollbar-track{background:var(--accent-soft);border-radius:999px}.number-line-scroll::-webkit-scrollbar-thumb{border:2px solid var(--accent-soft);background:var(--muted);border-radius:999px}.number-line-track{grid-template-columns:repeat(var(--number-line-count), 64px);width:max-content;min-width:100%;padding:36px 8px 8px;display:grid;position:relative}.number-line-track:before{content:"";background:var(--accent);border-radius:999px;height:5px;position:absolute;top:54px;left:40px;right:40px}.number-line-tick{scroll-snap-align:center;width:64px;min-height:104px;color:var(--ink);cursor:pointer;background:0 0;border:0;padding:0;position:relative}.number-line-tick>span{z-index:1;background:var(--muted);border-radius:2px;width:3px;height:27px;position:absolute;top:44px;left:calc(50% - 1px)}.number-line-tick>strong{font-size:18px;transition:color .12s,transform .12s;position:absolute;inset:77px 0 auto}.number-line-tick>small{color:var(--muted);text-transform:uppercase;font-size:8px;font-weight:850;position:absolute;inset:98px 0 auto}.number-line-tick:hover:not(:disabled)>strong,.number-line-tick.is-selected>strong{color:var(--accent);transform:scale(1.16)}.number-line-tick:focus-visible>strong{color:var(--accent);transform:scale(1.16)}.number-line-tick:focus-visible{outline:2px solid var(--accent);outline-offset:-4px;border-radius:7px}.number-line-tick:disabled{opacity:1;cursor:default}.number-line-jumper{z-index:2;background:var(--yellow);width:34px;height:34px;color:var(--on-yellow);box-shadow:0 5px 0 var(--yellow);border-radius:50%;padding:7px;position:absolute;top:0;left:calc(50% - 17px)}.number-line-tick.is-correct .number-line-jumper{background:var(--green);color:var(--on-accent);box-shadow:0 5px 0 var(--green)}.number-line-feedback{min-height:44px;color:var(--muted);text-align:center;justify-content:center;align-items:center;gap:7px;margin:12px 0 0;font-size:13px;font-weight:750;display:flex}.number-line-feedback svg{width:18px}.number-line-feedback.is-correct{color:var(--success-text)}.number-line-feedback.is-incorrect{color:var(--danger-text)}.number-line-actions{justify-content:center;align-items:center;gap:8px;min-height:48px;display:flex}.number-line-actions button{justify-content:center;align-items:center;gap:7px;display:inline-flex}.number-line-actions button svg{width:17px}.number-line-actions .quiet-button:disabled{opacity:.45;cursor:default}.number-line-unavailable{border:1px solid var(--line);background:var(--white);text-align:center;border-radius:10px;justify-items:center;width:min(620px,100% - 32px);margin:52px auto;padding:42px;display:grid}.number-line-unavailable>svg{background:var(--green-soft);width:50px;height:50px;color:var(--green);border-radius:50%;padding:10px}.number-line-unavailable h1{margin:8px 0;font-size:32px}.number-line-unavailable>p:not(.eyebrow){max-width:460px;color:var(--muted);margin:0 0 22px;line-height:1.5}.flash-setup,.flash-play,.game-complete{width:min(960px,100% - 32px);margin:0 auto;padding:32px 0 60px}.flash-intro{align-items:center;gap:16px;margin-bottom:25px;display:flex}.flash-intro>span{background:var(--teal-soft);width:54px;height:54px;color:var(--teal-text);border-radius:8px;flex:none;place-items:center;display:grid}.flash-intro svg{width:25px;height:25px}.flash-intro h1,.game-complete h1{letter-spacing:0;margin:0;font-size:38px;line-height:1.08}.flash-intro p:last-child{color:var(--muted);margin:7px 0 0}.array-builder-stage{grid-template-columns:minmax(230px,.65fr) minmax(0,1.35fr);gap:18px;margin-top:20px;display:grid}.array-builder-prompt,.array-builder-workbench{border:1px solid var(--line);background:var(--white);border-radius:10px;min-width:0}.array-builder-prompt{padding:28px}.array-builder-equation{border:1px solid var(--lilac-line);background:var(--lilac-soft);min-height:112px;color:var(--blue-text);text-align:center;border-radius:8px;place-items:center;margin-top:28px;padding:12px;font-size:clamp(34px,5vw,52px);font-weight:850;display:grid}.array-builder-prompt>p{color:var(--muted);margin:22px 0 0;font-size:15px;line-height:1.5}.array-builder-workbench{padding:22px}.array-builder-board{border:2px solid var(--blue-line);background:var(--lilac-soft);border-radius:9px;align-content:center;place-items:center;gap:14px;min-height:238px;padding:18px;transition:border-color .15s,background .15s;display:grid}.array-builder-board.is-incorrect{border-color:var(--coral);background:var(--coral-soft)}.array-builder-board.is-correct{border-color:var(--green-line);background:var(--green-soft)}.array-builder-empty{color:var(--muted);text-align:center;justify-items:center;gap:8px;display:grid}.array-builder-empty span{color:var(--blue-text);letter-spacing:8px;font-size:36px}.array-builder-empty strong{font-size:13px}.array-builder-dots{grid-template-columns:repeat(var(--array-columns), 14px);gap:4px;display:grid}.array-builder-dots span{background:var(--lilac);width:14px;height:14px;box-shadow:0 2px 0 var(--shadow-color);border-radius:50%}.array-builder-board.is-correct .array-builder-dots span{background:var(--green)}.array-builder-picker{border:0;margin:18px 0 0;padding:0}.array-builder-picker legend{color:var(--muted);text-transform:uppercase;margin-bottom:8px;font-size:10px;font-weight:850}.array-builder-picker>div{grid-template-columns:repeat(6,minmax(0,1fr));gap:7px;display:grid}.array-builder-picker button{border:2px solid var(--line-strong);background:var(--paper);cursor:pointer;border-radius:7px;min-width:0;min-height:48px;padding:0;font-size:18px;font-weight:850}.array-builder-picker button:hover:not(:disabled),.array-builder-picker button.is-selected{border-color:var(--lilac);background:var(--lilac-soft);color:var(--lilac-text)}.array-builder-picker button.is-wrong{border-color:var(--coral);background:var(--coral-soft);color:var(--danger-text);animation:.36s shake}.array-builder-picker button.is-correct{border-color:var(--green);background:var(--green-soft);color:var(--success-text)}.array-builder-picker button:disabled{opacity:.62;cursor:default}.array-builder-picker button.is-correct:disabled{opacity:1}.array-builder-feedback{min-height:42px;color:var(--muted);text-align:center;justify-content:center;align-items:center;gap:7px;margin:10px 0 0;font-size:12px;font-weight:750;display:flex}.array-builder-feedback svg{width:17px}.array-builder-feedback.is-incorrect{color:var(--danger-text)}.array-builder-feedback.is-correct{color:var(--success-text)}.array-builder-actions{justify-content:center;min-height:48px;display:flex}.array-builder-actions button{justify-content:center;align-items:center;gap:7px;min-width:150px;display:inline-flex}.array-builder-actions button:disabled{opacity:.45;cursor:default}.array-builder-actions svg{width:17px}.array-builder-unavailable{border:1px solid var(--line);background:var(--white);text-align:center;border-radius:10px;justify-items:center;width:min(620px,100% - 32px);margin:52px auto;padding:42px;display:grid}.array-builder-unavailable-symbol{background:var(--lilac-soft);min-width:74px;min-height:50px;color:var(--lilac);border-radius:25px;place-items:center;padding:8px 12px;font-size:20px;font-weight:850;display:grid}.array-builder-unavailable h1{margin:8px 0;font-size:32px}.array-builder-unavailable>p:not(.eyebrow){max-width:460px;color:var(--muted);margin:0 0 22px}@media (max-width:820px){.array-builder-stage{grid-template-columns:1fr}.array-builder-prompt{padding:22px}.array-builder-prompt>p{margin-top:14px}.array-builder-equation{min-height:88px;margin-top:18px}}@media (max-width:640px){.array-builder-game{width:calc(100% - 28px);padding-top:18px}.array-builder-stage{gap:12px}.array-builder-prompt,.array-builder-workbench{border-radius:8px;padding:16px}.array-builder-equation{min-height:76px;font-size:34px}.array-builder-prompt>p{font-size:13px}.array-builder-board{min-height:210px;padding:14px 8px}.array-builder-dots{grid-template-columns:repeat(var(--array-columns), 12px);gap:3px}.array-builder-dots span{width:12px;height:12px}.array-builder-picker>div{grid-template-columns:repeat(4,minmax(0,1fr))}.array-builder-picker button{min-height:50px}.array-builder-feedback{min-height:48px}.array-builder-actions button{width:100%}.array-builder-unavailable{margin:28px auto;padding:28px 18px}.array-builder-unavailable h1{font-size:27px}}@media (prefers-reduced-motion:reduce){.array-builder-picker button.is-wrong{animation:none}}.flash-settings-grid{border-block:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.game-settings-readonly{border:1px solid var(--yellow-line);background:var(--yellow-soft);color:var(--warning-text);border-radius:6px;align-items:center;gap:9px;padding:11px 12px;display:flex}.game-settings-readonly svg{flex:none;width:18px;height:18px}.game-settings-readonly strong,.game-settings-readonly small{display:block}.game-settings-readonly strong{font-size:10px}.game-settings-readonly small{margin-top:2px;font-size:8px}.flash-setting{border:0;border-bottom:1px solid var(--line);min-width:0;margin:0;padding:20px}.flash-setting:nth-child(odd):not(.is-wide){border-right:1px solid var(--line)}.flash-setting.is-wide{grid-column:1/-1}.flash-setting legend{justify-content:space-between;align-items:center;gap:8px;width:100%;padding:0;font-size:12px;font-weight:850;display:flex}.flash-setting-lock{color:var(--muted);text-transform:uppercase;align-items:center;gap:4px;font-size:9px;font-weight:800;display:inline-flex}.flash-setting-lock svg{width:12px;height:12px}.operation-picker{grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin-top:12px;display:grid}.operation-picker button{border:1px solid var(--line);background:var(--white);min-width:0;min-height:62px;color:var(--muted);cursor:pointer;border-radius:6px;justify-content:center;align-items:center;gap:8px;display:flex}.operation-picker button strong{font-size:24px}.operation-picker button span{font-size:11px;font-weight:800}.operation-picker button.is-active{border-color:var(--green);background:var(--green-soft);color:var(--green)}.operation-picker button:disabled,.flash-segments button:disabled,.family-picker button:disabled{cursor:not-allowed;opacity:.7}.flash-segments{border:1px solid var(--line);background:var(--paper);border-radius:7px;grid-template-columns:repeat(4,minmax(0,1fr));gap:3px;min-height:48px;margin-top:12px;padding:3px;display:grid}.flash-segments.is-five{grid-template-columns:repeat(5,minmax(0,1fr))}.flash-segments button{min-width:0;min-height:40px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:5px;padding:0 7px;font-size:11px;font-weight:800}.flash-segments button.is-active{background:var(--ink);color:var(--on-accent)}.custom-deck-size{color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-top:10px;font-size:10px;font-weight:800;display:flex}.custom-deck-size input{border:1px solid var(--line-strong);background:var(--white);border-radius:6px;width:80px;min-height:40px;padding:6px 9px}.flash-toggle-setting{border-bottom:1px solid var(--line);grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:6px 14px;min-height:88px;padding:18px 20px;display:grid}.flash-toggle-setting:nth-of-type(odd){border-right:1px solid var(--line)}.flash-toggle-setting>div strong,.flash-toggle-setting>div span{display:block}.flash-toggle-setting>div strong{font-size:12px}.flash-toggle-setting>div span{color:var(--muted);margin-top:4px;font-size:10px;line-height:1.35}.flash-toggle-setting .flash-setting-lock{grid-column:1}.flash-toggle-setting>.setting-switch{grid-area:1/2/span 2}.family-picker{grid-template-columns:repeat(12,minmax(0,1fr));gap:6px;margin-top:12px;display:grid}.family-picker button{aspect-ratio:1;border:1px solid var(--line);background:var(--white);min-width:0;min-height:40px;color:var(--muted);cursor:pointer;border-radius:6px;font-weight:850}.family-picker button.is-active{border-color:var(--teal-line);background:var(--teal-soft);color:var(--teal-text)}.flash-message{color:var(--danger-text);text-align:center;margin:14px 0 0;font-size:11px;font-weight:800}.flash-start-button{min-width:260px;margin:22px auto 0;display:flex}.flash-play{flex-direction:column;align-items:center;min-height:calc(100svh - 122px);display:flex}.flash-play-toolbar{justify-content:space-between;align-items:center;gap:14px;width:min(680px,100%);min-height:55px;margin-bottom:18px;display:flex}.flash-play-toolbar>div{flex:1;min-width:0}.flash-play-toolbar span{color:var(--muted);font-size:11px;font-weight:800}.flash-progress-track{background:var(--surface-disabled);border-radius:4px;width:100%;height:7px;margin-top:7px;overflow:hidden}.flash-progress-track i{border-radius:inherit;background:var(--teal);height:100%;transition:width .18s;display:block}.flash-card-stack{place-items:center;width:min(480px,100% - 26px);min-height:270px;display:grid;position:relative}.flash-card-stack>i{border:1px solid var(--teal-line);background:var(--teal-soft);border-radius:8px;width:calc(100% - 34px);height:220px;position:absolute}.flash-card-stack>i:first-child{transform:translate(-14px,6px)rotate(-2.5deg)}.flash-card-stack>i:nth-child(2){transform:translate(14px,6px)rotate(2.5deg)}.flash-practice-card{z-index:2;border:2px solid var(--teal-line);background:var(--white);width:calc(100% - 18px);height:238px;box-shadow:0 12px 0 var(--shadow-color), 0 20px 36px var(--shadow-color);text-align:center;border-radius:8px;flex-direction:column;justify-content:center;align-items:center;padding:28px;display:flex}.flash-practice-card.operation-subtraction{border-color:var(--coral-line)}.flash-practice-card.operation-multiplication{border-color:var(--yellow-line)}.flash-practice-card.operation-division{border-color:var(--blue-line)}.flash-practice-card.is-revealed{background:var(--green-soft);border-color:var(--green-line);animation:.34s both flash-card-reveal}.flash-practice-card.is-revealed.result-incorrect{background:var(--coral-soft);border-color:var(--coral-line)}.flash-practice-card.is-revealed.result-shown{background:var(--yellow-soft);border-color:var(--yellow-line)}.flash-practice-card>span{color:var(--muted);text-transform:uppercase;margin-bottom:20px;font-size:10px;font-weight:850}.flash-practice-card>strong{letter-spacing:0;font-size:56px;line-height:1}.flash-practice-card>small{color:var(--muted);margin-top:20px;font-size:13px;font-weight:750}.flash-practice-card.is-revealed>span{color:var(--success-text);margin-bottom:14px;font-size:16px}.flash-practice-card.is-revealed.result-incorrect>span{color:var(--danger-text)}.flash-practice-card.is-revealed.result-shown>span{color:var(--warning-text)}.flash-practice-card.is-revealed>strong{font-size:72px}.flash-practice-card.is-revealed>small{color:var(--ink);margin-top:18px;font-size:20px;font-weight:800}@keyframes flash-card-reveal{0%{opacity:.55;transform:rotateY(80deg)scale(.98)}to{opacity:1;transform:rotateY(0)scale(1)}}.flash-answer-choices{grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;width:min(520px,100%);margin-top:24px;display:grid}.flash-answer-choices button{border:1px solid var(--line-strong);background:var(--white);min-width:0;min-height:66px;box-shadow:0 4px 0 var(--surface-disabled);cursor:pointer;border-radius:7px;font-size:23px;font-weight:850}.flash-answer-choices button:hover{border-color:var(--teal-line);background:var(--teal-soft)}.flash-typed-answer{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:10px;width:min(420px,100%);margin-top:24px;display:grid}.flash-typed-answer label{color:var(--muted);gap:6px;font-size:10px;font-weight:800;display:grid}.flash-typed-answer input{border:1px solid var(--line-strong);background:var(--white);border-radius:7px;width:100%;min-height:58px;padding:8px 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