:root{--color-primary: #1cb0f6;--color-primary-dark: #006590;--color-primary-container: #1cb0f6;--color-on-primary: #ffffff;--color-secondary: #78c800;--color-secondary-dark: #3d6a00;--color-secondary-container: #a2f641;--color-on-secondary: #ffffff;--color-tertiary: #ff9600;--color-tertiary-dark: #8c5000;--color-tertiary-container: #f18e00;--color-on-tertiary: #ffffff;--color-error: #ba1a1a;--color-error-container: #ffdad6;--color-on-error: #ffffff;--color-background: #fbf9f9;--color-surface: #fbf9f9;--color-surface-low: #f5f3f3;--color-surface-high: #e9e8e7;--color-surface-highest: #e3e2e2;--color-surface-white: #ffffff;--color-on-surface: #1b1c1c;--color-on-surface-variant: #3e4850;--color-outline: #6e7881;--color-outline-variant: #bdc8d2;--font-family: "Quicksand", sans-serif;--font-size-display1: 32px;--font-size-display2: 28px;--font-size-headline: 24px;--font-size-body-lg: 20px;--font-size-body-md: 18px;--font-size-body-sm: 16px;--font-size-label: 14px;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-gutter: 20px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--btn-3d-offset: 4px;--btn-3d-offset-active: 0px;--nav-height: 72px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;height:100dvh;overflow:hidden}body{font-family:var(--font-family);font-size:var(--font-size-body-md);color:var(--color-on-surface);background:var(--color-background);-webkit-font-smoothing:antialiased;overscroll-behavior:none}#root{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;background:var(--color-surface-highest)}.app-shell{position:relative;width:100%;max-width:430px;height:100%;height:100dvh;display:flex;flex-direction:column;background:var(--color-background);overflow:hidden}.screen-wrap{flex:1;min-height:0;min-width:0;display:flex;flex-direction:column;overflow:hidden}.screen{flex:1;overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;padding-bottom:calc(var(--nav-height) + env(safe-area-inset-bottom,0px));padding-top:env(safe-area-inset-top,0px)}.screen-content{padding:var(--space-lg) var(--space-gutter)}.material-symbols-rounded{font-variation-settings:"FILL" 1,"wght" 600,"GRAD" 0,"opsz" 24;font-size:24px;line-height:1;-webkit-user-select:none;user-select:none;vertical-align:middle}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);font-family:var(--font-family);font-weight:700;font-size:var(--font-size-body-md);border:none;cursor:pointer;text-decoration:none;outline:none;border-radius:var(--radius-lg);padding:0 var(--space-xl);height:56px;min-width:80px;transition:transform 80ms ease,box-shadow 80ms ease;position:relative;box-shadow:0 var(--btn-3d-offset) 0 0 #00000040;-webkit-user-select:none;user-select:none}.btn:active{transform:translateY(var(--btn-3d-offset));box-shadow:0 0 #00000040}.btn-primary{background:var(--color-primary);color:var(--color-on-primary);box-shadow:0 4px #0d8cc4}.btn-primary:active{transform:translateY(4px);box-shadow:none}.btn-success{background:var(--color-secondary);color:var(--color-on-secondary);box-shadow:0 4px #559200}.btn-success:active{transform:translateY(4px);box-shadow:none}.btn-action{background:var(--color-tertiary);color:var(--color-on-tertiary);box-shadow:0 4px #c47300}.btn-action:active{transform:translateY(4px);box-shadow:none}.btn-ghost{background:var(--color-surface-white);color:var(--color-primary-dark);border:2px solid var(--color-outline-variant);box-shadow:0 4px 0 0 var(--color-surface-high)}.btn-ghost:active{transform:translateY(4px);box-shadow:none}.btn-full{width:100%;border-radius:var(--radius-lg)}.btn-sm{height:40px;font-size:var(--font-size-label);padding:0 var(--space-md)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none!important;box-shadow:none!important;pointer-events:none}.card{background:var(--color-surface-white);border-radius:var(--radius-lg);border:2px solid var(--color-surface-highest);padding:var(--space-lg)}.card-blue{border-color:var(--color-primary);background:#e8f7fe}.card-green{border-color:var(--color-secondary);background:#f0fde0}.progress-track{width:100%;height:20px;background:var(--color-surface-high);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:var(--color-secondary);border-radius:var(--radius-full);transition:width .4s ease}.feedback-bar{position:fixed;bottom:var(--nav-height);left:50%;transform:translate(-50%);width:100%;max-width:430px;padding:var(--space-md) var(--space-gutter);display:flex;align-items:center;justify-content:space-between;gap:var(--space-md);z-index:200;animation:slideUp .25s ease}.feedback-bar.success{background:var(--color-secondary);color:var(--color-on-secondary)}.feedback-bar.error{background:var(--color-error-container);color:var(--color-error)}@keyframes slideUp{0%{transform:translate(-50%) translateY(100%)}to{transform:translate(-50%) translateY(0)}}.mascot-bubble{display:flex;align-items:flex-start;gap:var(--space-md);background:#e8f7fe;border:2px solid var(--color-primary);border-radius:var(--radius-lg);padding:var(--space-md);font-size:var(--font-size-body-sm);color:var(--color-primary-dark)}.mascot-bubble .mascot-icon{width:40px;height:40px;border-radius:50%;background:var(--color-primary);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff}.ks-toggle{display:flex;gap:var(--space-xs);background:var(--color-surface-high);border-radius:var(--radius-full);padding:4px}.ks-toggle-btn{flex:1;height:36px;font-family:var(--font-family);font-weight:700;font-size:var(--font-size-label);border:none;background:transparent;border-radius:var(--radius-full);cursor:pointer;color:var(--color-on-surface-variant);transition:background .2s,color .2s}.ks-toggle-btn.active{background:var(--color-primary);color:var(--color-on-primary)}.bottom-nav{height:calc(var(--nav-height) + env(safe-area-inset-bottom,0px));padding-bottom:env(safe-area-inset-bottom,0px);background:var(--color-surface-white);border-top:2px solid var(--color-surface-highest);display:flex;align-items:flex-start;padding-top:8px;flex-shrink:0}.nav-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;background:none;border:none;cursor:pointer;padding:4px 0;color:var(--color-outline);font-family:var(--font-family);font-size:11px;font-weight:700;letter-spacing:.04em;transition:color .15s}.nav-item.active{color:var(--color-primary)}.nav-item .material-symbols-rounded{font-size:26px;font-variation-settings:"FILL" 0,"wght" 400,"GRAD" 0,"opsz" 24}.nav-item.active .material-symbols-rounded{font-variation-settings:"FILL" 1,"wght" 600,"GRAD" 0,"opsz" 24}.screen-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-gutter);background:var(--color-surface-white);border-bottom:2px solid var(--color-surface-highest)}.streak-badge{display:inline-flex;align-items:center;gap:4px;background:#fff3e0;border:2px solid var(--color-tertiary);border-radius:var(--radius-full);padding:4px 12px;font-weight:700;font-size:var(--font-size-body-md);color:var(--color-tertiary-dark)}.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-sm)}.key{height:64px;font-family:var(--font-family);font-size:var(--font-size-body-lg);font-weight:700;background:var(--color-surface-white);border:2px solid var(--color-surface-highest);border-radius:var(--radius-lg);cursor:pointer;color:var(--color-on-surface);transition:transform 80ms,box-shadow 80ms;box-shadow:0 4px 0 0 var(--color-surface-high);display:flex;align-items:center;justify-content:center}.key:active{transform:translateY(4px);box-shadow:none}.key.key-action{background:var(--color-primary);color:#fff;border-color:var(--color-primary-dark);box-shadow:0 4px #0d8cc4}.key.key-zero{grid-column:span 2}.key:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}.key:disabled:active{transform:none;box-shadow:none}.counter-display{background:var(--color-primary);border-radius:var(--radius-xl);color:#fff;text-align:center;padding:var(--space-xl);box-shadow:0 6px #0d8cc4}.counter-display .counter-number{font-size:72px;font-weight:700;line-height:1}.counter-display .counter-word{font-size:var(--font-size-headline);font-weight:600;margin-top:var(--space-sm);opacity:.9}.word-display{background:var(--color-surface-white);border:2px solid var(--color-surface-highest);border-radius:var(--radius-xl);padding:var(--space-lg) var(--space-xl);text-align:center;min-height:80px;display:flex;flex-direction:column;align-items:center;justify-content:center}.word-display .number-value{font-size:48px;font-weight:700;color:var(--color-primary);line-height:1}.word-display .number-words{font-size:var(--font-size-body-lg);font-weight:600;color:var(--color-on-surface);margin-top:var(--space-sm);overflow-wrap:anywhere;word-break:break-word;white-space:normal}.choices{display:flex;flex-direction:column;gap:var(--space-sm)}.choice-btn{width:100%;text-align:left;background:var(--color-surface-white);border:2px solid var(--color-surface-highest);border-radius:var(--radius-lg);padding:var(--space-md) var(--space-lg);font-family:var(--font-family);font-size:var(--font-size-body-lg);font-weight:600;cursor:pointer;color:var(--color-on-surface);display:flex;align-items:center;gap:var(--space-md);transition:border-color .15s,background .15s;box-shadow:0 3px 0 0 var(--color-surface-highest)}.choice-btn:active{transform:translateY(3px);box-shadow:none}.choice-btn.selected{border-color:var(--color-primary);background:#e8f7fe}.choice-btn.correct{border-color:var(--color-secondary);background:#f0fde0}.choice-btn.incorrect{border-color:var(--color-error);background:var(--color-error-container)}.choice-label{width:36px;height:36px;border-radius:50%;background:var(--color-surface-high);display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0;font-size:var(--font-size-body-sm)}.choice-btn.selected .choice-label{background:var(--color-primary);color:#fff}.choice-btn.correct .choice-label{background:var(--color-secondary);color:#fff}.choice-btn.incorrect .choice-label{background:var(--color-error);color:#fff}.path-item{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md);background:var(--color-surface-white);border-radius:var(--radius-lg);border:2px solid var(--color-surface-highest);box-shadow:0 3px 0 0 var(--color-surface-high);cursor:pointer}.path-item.locked{opacity:.5;cursor:not-allowed}.path-item .path-icon{width:48px;height:48px;border-radius:var(--radius-md);background:var(--color-primary-container);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--color-on-primary)}.path-item.locked .path-icon{background:var(--color-surface-high);color:var(--color-outline)}.path-item.completed .path-icon{background:var(--color-secondary)}.objects-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:var(--space-sm);padding:var(--space-md);background:var(--color-surface-low);border-radius:var(--radius-lg);border:2px solid var(--color-surface-highest);min-height:120px}.counter-object{width:48px;height:48px;border-radius:50%;background:var(--color-primary-container);display:flex;align-items:center;justify-content:center;font-size:24px;animation:popIn .2s ease}@keyframes popIn{0%{transform:scale(0)}to{transform:scale(1)}}.text-display{font-size:var(--font-size-display1);font-weight:700;line-height:1.2}.text-headline{font-size:var(--font-size-headline);font-weight:700}.text-body-lg{font-size:var(--font-size-body-lg);font-weight:500}.text-label{font-size:var(--font-size-label);font-weight:700;letter-spacing:.08em;text-transform:uppercase}.flex{display:flex}.flex-col{display:flex;flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-sm{gap:var(--space-sm)}.gap-md{gap:var(--space-md)}.gap-lg{gap:var(--space-lg)}.mt-sm{margin-top:var(--space-sm)}.mt-md{margin-top:var(--space-md)}.mt-lg{margin-top:var(--space-lg)}.mt-xl{margin-top:var(--space-xl)}.text-center{text-align:center}.color-primary{color:var(--color-primary)}.color-success{color:var(--color-secondary-dark)}.color-muted{color:var(--color-on-surface-variant)}.pv-units-area{display:flex;flex-wrap:wrap;gap:6px;padding:var(--space-md);background:var(--color-surface-low);border-radius:var(--radius-lg);border:2px solid var(--color-surface-highest);min-height:100px;align-items:center;justify-content:center}.pv-layout{display:flex;gap:var(--space-md);background:var(--color-surface-low);border-radius:var(--radius-lg);border:2px solid var(--color-surface-highest);padding:var(--space-md);min-height:160px}.pv-section{flex:1;display:flex;flex-direction:column;align-items:center;gap:var(--space-sm)}.pv-label{font-size:var(--font-size-label);font-weight:700;text-transform:uppercase;letter-spacing:.06em}.pv-tens-row{flex:1;display:flex;flex-wrap:wrap;gap:4px;justify-content:center;align-items:flex-end}.pv-tens-rod{display:flex;flex-direction:column;gap:1px;animation:popIn .15s ease}.pv-tens-sq{width:12px;height:12px;background:var(--color-primary);border-radius:1px}.pv-units-row{flex:1;display:flex;flex-wrap:wrap;gap:6px;justify-content:center;align-items:flex-start;max-width:140px}.pv-unit-sq{width:28px;height:28px;background:var(--color-tertiary);border-radius:var(--radius-sm);box-shadow:0 2px #c47300;animation:popIn .15s ease}.pv-divider{width:2px;background:var(--color-surface-highest);border-radius:var(--radius-full);align-self:stretch}@keyframes slideUpSimple{0%{transform:translateY(100%)}to{transform:translateY(0)}}@media screen and (max-height: 500px){:root{--nav-height: 0px}.app-shell{flex-direction:row;max-width:100%}.bottom-nav{order:-1;flex-direction:column;width:60px;height:100%;border-top:none;border-right:2px solid var(--color-surface-highest);padding:8px 0;flex-shrink:0;align-items:center;justify-content:center;gap:0}.nav-item{width:100%;padding:8px 0;font-size:9px;gap:2px}.feedback-bar{left:60px;right:0;width:auto;max-width:none;transform:none;bottom:0;animation:slideUpSimple .25s ease}.screen-header{padding:6px var(--space-gutter)}.counter-display{padding:var(--space-sm) var(--space-lg)}.counter-display .counter-number{font-size:44px}.counter-display .counter-word{font-size:var(--font-size-body-sm);margin-top:2px}.word-display{padding:var(--space-sm) var(--space-md);min-height:52px}.word-display .number-value{font-size:28px}.word-display .number-words{font-size:var(--font-size-label);margin-top:2px}.key{height:40px;font-size:var(--font-size-body-sm)}.choice-btn{padding:var(--space-sm) var(--space-md);font-size:var(--font-size-body-md)}.mascot-bubble{padding:var(--space-sm)}.pv-units-area,.pv-layout{min-height:60px;padding:var(--space-sm)}.landscape-2col{display:grid!important;grid-template-columns:1fr 1fr;gap:var(--space-md)!important}.words-landscape{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md);align-items:start}.words-landscape .keypad{margin-top:0}}