.ui-button{min-height:44px;color:var(--island-ink);font:inherit;text-align:center;cursor:pointer;transition:color var(--app-motion-duration-fast) var(--app-motion-ease), background-color var(--app-motion-duration-fast) var(--app-motion-ease), border-color var(--app-motion-duration-fast) var(--app-motion-ease), box-shadow var(--app-motion-duration-fast) var(--app-motion-ease), transform var(--app-motion-duration-fast) var(--app-motion-ease);background:0 0;border:1px solid #0000;border-radius:14px;justify-content:center;align-items:center;gap:9px;padding:10px 16px;font-size:14px;font-weight:750;line-height:1.3;text-decoration:none;display:inline-flex}.ui-button:hover:not(:disabled){transform:translateY(-1px)}.ui-button:active:not(:disabled){transform:translateY(0)}.ui-button--primary{color:#fff;background:var(--app-accent)}.ui-button--primary:hover:not(:disabled){background:var(--app-accent-hover)}.ui-button--default{border-color:var(--island-border);color:var(--island-ink);background:var(--island-surface);box-shadow:var(--app-shadow-sm)}.ui-button--default:hover:not(:disabled){border-color:var(--app-border-hover);background:var(--island-surface-soft)}.ui-button--text,.ui-button--link{min-height:38px;color:var(--app-accent-pressed);border-color:#0000;padding:7px 10px}.ui-button--text:hover:not(:disabled),.ui-button--link:hover:not(:disabled){color:var(--app-accent);background:var(--app-accent-soft)}.ui-button--link{text-underline-offset:3px;text-decoration:underline}.ui-button--dashed{border-style:dashed;border-color:var(--island-border);color:var(--island-ink);background:var(--island-surface)}.ui-button--small{min-height:36px;padding:7px 12px;font-size:13px}.ui-button--large{min-height:52px;padding:13px 20px;font-size:15px}.ui-button--block{width:100%}.ui-button--danger{color:#fff;background:var(--app-error)}.ui-button--danger:hover:not(:disabled){background:var(--app-error-hover)}.ui-button--ghost{color:var(--app-accent);background:0 0;border-color:currentColor}.ui-button:disabled{color:var(--app-disabled);background:var(--app-disabled-bg);border-color:var(--island-border);box-shadow:none;cursor:not-allowed;opacity:.78}.ui-button--text:disabled,.ui-button--link:disabled{background:0 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10px;font-size:13px;font-weight:700;line-height:1.3;display:inline-flex;position:relative}.ui-radio-option:hover,.ui-checkbox-option:hover{color:var(--island-ink);background:var(--island-surface-soft)}.ui-radio-option.is-checked,.ui-checkbox-option.is-checked{color:var(--app-accent-pressed);background:var(--app-accent-soft);border-color:#e4e0ff}.ui-radio-option.is-disabled,.ui-checkbox-option.is-disabled{opacity:.62;cursor:not-allowed}.ui-radio-option input,.ui-checkbox-option input{opacity:0;width:100%;height:100%;cursor:inherit;margin:0;position:absolute;inset:0}.ui-radio-mark{background:var(--island-surface);border:1.5px solid #a9a5b8;border-radius:50%;flex:0 0 17px;width:17px;height:17px;display:inline-block;position:relative}.ui-radio-option.is-checked .ui-radio-mark{border-color:var(--app-accent)}.ui-radio-option.is-checked .ui-radio-mark:after{border-radius:inherit;background:var(--app-accent);content:"";position:absolute;inset:3px}.ui-radio-option input:focus-visible+.ui-radio-mark,.ui-checkbox-option input:focus-visible+.ui-checkbox-mark{outline:3px solid color-mix(in srgb, var(--app-accent) 40%, transparent);outline-offset:2px}.ui-checkbox-option{border-radius:12px}.ui-checkbox-mark{color:#fff;background:var(--island-surface);border:1.5px solid #a9a5b8;border-radius:6px;flex:0 0 19px;place-items:center;width:19px;height:19px;font-size:12px;font-weight:900;display:inline-grid}.ui-checkbox-option.is-checked .ui-checkbox-mark{border-color:var(--app-accent);background:var(--app-accent)}.ui-checkbox-mark:after{content:"";opacity:0;border:2px solid;border-top:0;border-left:0;width:5px;height:9px;transform:translateY(-1px)rotate(45deg)}.ui-checkbox-option.is-checked .ui-checkbox-mark:after{opacity:1}.ui-switch{min-height:32px;color:var(--island-ink);cursor:pointer;align-items:center;gap:9px;display:inline-flex;position:relative}.ui-switch 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color-mix(in srgb, var(--app-accent) 40%, transparent);outline-offset:3px}.ui-progress{align-items:center;gap:9px;min-width:0;display:flex}.ui-progress-track{background:var(--island-surface-tint);border-radius:999px;flex:auto;min-width:0;height:8px;overflow:hidden}.ui-progress--small .ui-progress-track{height:5px}.ui-progress--large .ui-progress-track{height:12px}.ui-progress-fill{border-radius:inherit;background:var(--app-accent);transform-origin:0;width:100%;height:100%;transition-property:transform;transition-timing-function:var(--app-motion-ease);display:block}.ui-progress-info{color:var(--island-muted);font-variant-numeric:tabular-nums;flex:none;font-size:12px}.ui-upload{max-width:100%;display:inline-flex}.ui-upload-input{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.ui-upload-trigger{border:1px solid 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.exploration-node-title,:root[data-theme=dark] .exploration-unit-node.is-complete .exploration-node-state{color:#d0ead0}:root[data-theme=dark] .exploration-map-note{color:var(--island-muted);background:var(--island-surface-soft)}:root[data-theme=dark] .achievement-summary-card{color:var(--island-ink);border-color:var(--island-border);background:var(--island-surface-soft)}:root[data-theme=dark] .achievement-summary-symbol{color:#c5e1b5;background:#3a5540;border-color:#58745b}:root[data-theme=dark] .achievement-summary-copy h2{color:#dcebdd}:root[data-theme=dark] .achievement-summary-copy>p,:root[data-theme=dark] .achievement-summary-next-label,:root[data-theme=dark] .achievement-summary-footnote{color:#b8c8ba}:root[data-theme=dark] .achievement-summary-copy>p strong{color:#c3e4c3}:root[data-theme=dark] .achievement-summary-track{background:#405248}:root[data-theme=dark] .achievement-page-heading h1{color:var(--island-ink)}:root[data-theme=dark] 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.difficulty-task-count{color:var(--app-accent-pressed);background:var(--app-accent-soft)}:root[data-theme=dark] .task-card{border-color:var(--island-border);background:var(--island-surface)}:root[data-theme=dark] .catalog-empty-note,:root[data-theme=dark] .task-track-empty{border-color:var(--island-border);background:var(--island-surface-soft)}:root{--island-content-width:clamp(1120px, 73vw, 1440px);font-family:var(--app-font-family);color:var(--island-ink);background:var(--island-paper);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-synthesis:none;text-rendering:optimizelegibility}*{box-sizing:border-box}body{min-width:0;min-height:100dvh;color:var(--island-ink);background:var(--island-paper);margin:0}button,input{font:inherit}.app-frame{min-height:100dvh}.app-frame main h1[data-route-focus=true]{width:fit-content;max-width:100%}.app-frame main h1[data-route-focus=true]:focus-visible{outline:2px solid 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17px;display:flex}.measurement-object-label{color:var(--island-muted);font-size:13px;font-weight:800}.measurement-object-shape{background:var(--app-accent);transform-origin:0;border-radius:999px;width:100%;min-width:4px;height:16px;display:block}.ruler-face{background:var(--island-surface-soft);border:1px solid #e6d8b6;border-radius:14px;padding:17px 10px 10px}.ruler-ticks{align-items:end;display:grid}.ruler-tick{color:var(--island-muted);justify-items:center;gap:4px;font-size:10px;display:grid}.ruler-tick i{background:#9e9a86;width:1px;height:10px}.ruler-tick i.is-major{background:#727a77;width:2px;height:20px}.ruler-unit{color:#9a8967;text-align:right;margin-top:5px;font-size:13px}.measurement-slider-label{color:var(--island-muted);margin:0;font-size:14px;font-weight:700}.measurement-stepper{justify-content:center;align-items:center;gap:18px;min-height:58px;display:flex}.measurement-stepper .ui-button{width:50px;min-width:50px;height:50px;padding:0}.measurement-value{min-width:112px;color:var(--island-ink);text-align:center;font-size:20px;font-weight:800}.measurement-slider-ends{color:var(--island-muted);justify-content:space-between;font-size:13px;display:flex}.arithmetic-expression{border:1px solid var(--island-border);color:var(--island-ink);background:var(--island-surface-soft);letter-spacing:.05em;text-align:center;border-radius:18px;padding:20px 15px;font-size:clamp(30px,7vw,42px);font-weight:900}.place-value-board{border:1px dashed var(--app-border-hover);background:var(--island-surface-soft);border-radius:18px;flex-wrap:wrap;justify-content:center;gap:11px;padding:15px;display:flex}.place-number{background:var(--island-surface-tint);border-radius:12px;justify-items:center;gap:7px;min-width:90px;padding:8px;display:grid}.place-number-value{color:var(--app-accent-pressed);font-size:18px;font-weight:900}.place-digit-grid{gap:6px;display:flex}.place-digit-grid span{background:var(--island-surface);border-radius:8px;justify-items:center;min-width:38px;padding:4px;display:grid}.place-digit-grid small{color:#8792a1;font-size:13px}.place-digit-grid strong{color:var(--island-ink);font-size:15px}.arithmetic-answer-label{color:var(--island-muted);font-size:14px;font-weight:800}.arithmetic-answer-row{align-items:center;gap:10px;display:flex}.arithmetic-answer-input{width:min(100%,240px)}.arithmetic-answer-input .ui-input{text-align:center;font-size:26px;font-weight:800}.arithmetic-answer-row span{color:#8a95a3;font-size:13px}.arithmetic-keyboard-hint{color:#8390a0;margin:-9px 0 0;font-size:13px}.calculation-steps{color:var(--island-muted);background:var(--island-surface-soft);border-radius:16px;padding:15px 18px;line-height:1.7}.calculation-steps strong{color:var(--app-accent-pressed)}.calculation-steps ol{gap:5px;margin:8px 0 0;padding-left:21px;display:grid}@media (width<=420px){.ruler-face{padding-inline:6px}.ruler-tick{font-size:10px}.ruler-tick i{height:8px}.ruler-tick i.is-major{height:15px}.measurement-slider-ends{font-size:13px}.place-value-board{justify-content:stretch;gap:7px;padding:10px 7px}.place-number{flex:70px;min-width:68px;padding:7px 3px}.arithmetic-answer-input .ui-input{font-size:23px}}.earned-star{width:70px;height:70px;color:var(--island-ink);background:var(--island-sun);border:3px solid #ffffffe6;border-radius:50%;place-items:center;margin:18px auto 4px;display:grid}.finish-actions{flex-wrap:wrap;gap:10px;display:flex}.summary-kindness{color:#7a8797;margin:24px 0 0;font-size:13px;line-height:1.6}.summary-achievement{color:#53765b;background:var(--app-accent-soft);border:1px solid #c6dfbb;border-radius:20px;justify-items:center;gap:7px;width:min(100%,390px);margin:18px auto 4px;padding:16px 20px;display:grid}.summary-achievement>span:first-child{letter-spacing:.06em;font-size:13px;font-weight:900}.summary-achievement strong{color:#315e41;font-size:19px}.summary-achievement p{color:#647b68;margin:0;font-size:13px;line-height:1.6}.game-shell>.hero-guide--compact{margin:14px 0 0}.session-finish-card .hero-guide{box-sizing:border-box}@media (width<=600px){.game-shell>.hero-guide--compact{width:100%}.session-finish-card .hero-guide{text-align:left}}@media (width<=1024px){.order-controls .order-control{width:48px;height:48px}.category-choice{min-height:48px}}.match-choice>span{overflow-wrap:anywhere;min-width:0}.match-choice small{white-space:nowrap;flex:none}.app-global-header{z-index:20;border-bottom:1px solid var(--app-line);background:var(--island-surface);width:100%;position:relative}.textbook-migration-notice{width:min(var(--island-content-width), calc(100% - 36px));border:1px solid var(--app-line);color:var(--island-ink);background:var(--island-surface);border-radius:16px;justify-content:space-between;align-items:center;gap:16px;margin:14px auto 0;padding:12px 16px;display:flex}.textbook-migration-notice p{margin:0;line-height:1.5}@media (width<=560px){.textbook-migration-notice{flex-direction:column;align-items:flex-start;width:calc(100% - 24px)}}.app-global-header-inner{width:min(var(--island-content-width), calc(100% - 36px));justify-content:space-between;align-items:center;min-height:70px;margin:0 auto;display:flex}.app-brand-link{min-width:0;color:var(--island-ink);align-items:center;gap:10px;font-size:19px;font-weight:900;text-decoration:none;display:inline-flex}.app-brand-link img{object-fit:cover;border-radius:13px;width:42px;height:42px;display:block}.app-brand-link:focus-visible{outline:3px solid var(--app-accent);outline-offset:4px;border-radius:10px}.app-navigation-trigger{min-width:48px;min-height:44px}.app-navigation-layer{z-index:100;position:fixed;inset:0}.app-navigation-backdrop{background:#110d257a;animation:.18s ease-out both app-navigation-backdrop-in;position:absolute;inset:0}.app-navigation-drawer{width:min(360px,100vw - 20px);height:100dvh;padding:max(20px, env(safe-area-inset-top)) 22px max(22px, env(safe-area-inset-bottom));border-left:1px solid var(--island-border);color:var(--island-ink);background:var(--island-surface);border-radius:24px 0 0 24px;flex-direction:column;animation:.22s cubic-bezier(.4,0,.2,1) both app-navigation-drawer-in;display:flex;position:absolute;top:0;right:0;box-shadow:-14px 0 38px #1b163f33}.app-navigation-heading{border-bottom:1px solid var(--app-line);justify-content:space-between;align-items:center;gap:12px;padding-bottom:20px;display:flex}.app-navigation-heading h2{color:var(--island-ink);margin:0;font-size:20px;font-weight:900}.app-navigation-close{min-width:48px;min-height:48px}.app-navigation-list{gap:8px;padding-top:22px;display:grid}.app-navigation-item{text-align:left;width:100%;min-height:48px;font-size:15px;font-weight:800;justify-content:flex-start!important;padding:10px 14px!important}.app-navigation-item[aria-current=page]{text-decoration:underline;-webkit-text-decoration-color:var(--app-accent);text-decoration-color:var(--app-accent);text-underline-offset:5px}.app-navigation-item:focus-visible,.app-navigation-close:focus-visible,.app-navigation-trigger:focus-visible{outline:3px solid var(--app-accent);outline-offset:3px}.app-navigation-settings{border-top:1px solid var(--app-line);margin-top:auto;padding-top:18px}@keyframes app-navigation-backdrop-in{0%{opacity:0}to{opacity:1}}@keyframes app-navigation-drawer-in{0%{opacity:.72;transform:translate(24px)}to{opacity:1;transform:translate(0)}}@media (width<=700px){.app-global-header-inner{width:calc(100% - 28px);min-height:62px}.app-brand-link{gap:8px;font-size:17px}.app-brand-link img{border-radius:12px;width:38px;height:38px}.app-navigation-drawer{width:min(360px,100vw - 12px);padding-inline:18px}}@media (prefers-reduced-motion:reduce){.app-navigation-backdrop,.app-navigation-drawer{animation:none}}