@layer properties;@layer theme,base,components,utilities;@layer theme{:root,:host{--font-sans: "Nunito Variable", ui-rounded, system-ui, sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--color-red-700: oklch(50.5% .213 27.518);--color-green-700: oklch(52.7% .154 150.069);--color-black: #000;--color-white: #fff;--spacing: .25rem;--text-sm: .875rem;--text-sm--line-height: calc(1.25 / .875);--text-lg: 1.125rem;--text-lg--line-height: calc(1.75 / 1.125);--text-xl: 1.25rem;--text-xl--line-height: calc(1.75 / 1.25);--text-2xl: 1.5rem;--text-2xl--line-height: calc(2 / 1.5);--text-3xl: 1.875rem;--text-3xl--line-height: 1.2 ;--ease-in-out: cubic-bezier(.4, 0, .2, 1);--default-transition-duration: .15s;--default-transition-timing-function: cubic-bezier(.4, 0, .2, 1);--default-font-family: var(--font-sans);--default-mono-font-family: var(--font-mono);--color-ink: #1e2440;--color-ink-soft: #5d6382;--color-paper: #fff8ee;--color-card: #ffffff;--color-line: #efe5d5;--color-brand: #ff7a45;--color-additive: #2f7de1;--color-additive-soft: #e4efff;--color-additive-ink: #1d4f94;--color-multiplicative: #8b5cf6;--color-multiplicative-soft: #efe9ff;--color-multiplicative-ink: #5b30c2;--color-word-problem: #ea8a0b;--color-word-problem-soft: #fff1d9;--color-word-problem-ink: #9a5200;--radius-card: 1.25rem;--shadow-card: 0 1px 0 rgb(30 36 64 / .06), 0 6px 18px -8px rgb(30 36 64 / .25)}}@layer base{*,:after,:before,::backdrop,::file-selector-button{box-sizing:border-box;margin:0;padding:0;border:0 solid}html,:host{line-height:1.5;-webkit-text-size-adjust:100%;tab-size:4;font-family:var(--default-font-family, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings, normal);font-variation-settings:var(--default-font-variation-settings, normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings, normal);font-variation-settings:var(--default-mono-font-variation-settings, normal);font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{display:block;vertical-align:middle}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea,::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;border-radius:0;background-color:transparent;opacity:1}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not (-webkit-appearance: -apple-pay-button)) or (contain-intrinsic-size: 1px){::placeholder{color:currentcolor}@supports (color: color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit,::-webkit-datetime-edit-year-field,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute-field,::-webkit-datetime-edit-second-field,::-webkit-datetime-edit-millisecond-field,::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]),::file-selector-button{appearance:button}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer utilities{.\@container{container-type:inline-size}.invisible{visibility:hidden}.visible{visibility:visible}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.static{position:static}.sticky{position:sticky}.end-1{inset-inline-end:calc(var(--spacing) * 1)}.isolate{isolation:isolate}.container{width:100%}@media(width>=40rem){.container{max-width:40rem}}@media(width>=48rem){.container{max-width:48rem}}@media(width>=64rem){.container{max-width:64rem}}@media(width>=80rem){.container{max-width:80rem}}@media(width>=96rem){.container{max-width:96rem}}.m-0{margin:0}.m-auto{margin:auto}.my-2{margin-block:calc(var(--spacing) * 2)}.mt-4{margin-top:calc(var(--spacing) * 4)}.mt-6{margin-top:calc(var(--spacing) * 6)}.mb-1{margin-bottom:var(--spacing)}.mb-3{margin-bottom:calc(var(--spacing) * 3)}.mb-4{margin-bottom:calc(var(--spacing) * 4)}.mb-8{margin-bottom:calc(var(--spacing) * 8)}.ml-6{margin-left:calc(var(--spacing) * 6)}.block{display:block}.contents{display:contents}.flex{display:flex}.grid{display:grid}.hidden{display:none}.inline{display:inline}.inline-flex{display:inline-flex}.table{display:table}.h-full{height:100%}.w-full{width:100%}.min-w-0{min-width:0px}.flex-1{flex:1}.shrink{flex-shrink:1}.shrink-0{flex-shrink:0}.grow{flex-grow:1}.transform{transform:var(--tw-rotate-x, ) var(--tw-rotate-y, ) var(--tw-rotate-z, ) var(--tw-skew-x, ) var(--tw-skew-y, )}.resize{resize:both}.list-decimal{list-style-type:decimal}.flex-col{flex-direction:column}.flex-row{flex-direction:row}.flex-row-reverse{flex-direction:row-reverse}.flex-wrap{flex-wrap:wrap}.items-center{align-items:center}.justify-center{justify-content:center}.justify-end{justify-content:flex-end}.gap-0\.5{gap:calc(var(--spacing) * .5)}.gap-2{gap:calc(var(--spacing) * 2)}.gap-3{gap:calc(var(--spacing) * 3)}.self-center{align-self:center}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.rounded{border-radius:.25rem}.border{border-style:var(--tw-border-style);border-width:1px}.border-b-2{border-bottom-style:var(--tw-border-style);border-bottom-width:2px}.border-black{border-color:var(--color-black)}.border-green-700{border-color:var(--color-green-700)}.border-red-700{border-color:var(--color-red-700)}.bg-transparent{background-color:transparent}.bg-white{background-color:var(--color-white)}.p-0{padding:0}.text-center{text-align:center}.font-mono{font-family:var(--font-mono)}.text-2xl{font-size:var(--text-2xl);line-height:var(--tw-leading, var(--text-2xl--line-height))}.text-3xl{font-size:var(--text-3xl);line-height:var(--tw-leading, var(--text-3xl--line-height))}.text-lg{font-size:var(--text-lg);line-height:var(--tw-leading, var(--text-lg--line-height))}.text-sm{font-size:var(--text-sm);line-height:var(--tw-leading, var(--text-sm--line-height))}.text-xl{font-size:var(--text-xl);line-height:var(--tw-leading, var(--text-xl--line-height))}.text-green-700{color:var(--color-green-700)}.text-ink-soft{color:var(--color-ink-soft)}.text-red-700{color:var(--color-red-700)}.uppercase{text-transform:uppercase}.underline{text-decoration-line:underline}.opacity-100{opacity:100%}.shadow{--tw-shadow: 0 1px 3px 0 var(--tw-shadow-color, rgb(0 0 0 / .1)), 0 1px 2px -1px var(--tw-shadow-color, rgb(0 0 0 / .1));box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.ring{--tw-ring-shadow: var(--tw-ring-inset, ) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color, currentcolor);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.outline{outline-style:var(--tw-outline-style);outline-width:1px}.blur{--tw-blur: blur(8px);filter:var(--tw-blur, ) var(--tw-brightness, ) var(--tw-contrast, ) var(--tw-grayscale, ) var(--tw-hue-rotate, ) var(--tw-invert, ) var(--tw-saturate, ) var(--tw-sepia, ) var(--tw-drop-shadow, )}.filter{filter:var(--tw-blur, ) var(--tw-brightness, ) var(--tw-contrast, ) var(--tw-grayscale, ) var(--tw-hue-rotate, ) var(--tw-invert, ) var(--tw-saturate, ) var(--tw-sepia, ) var(--tw-drop-shadow, )}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease, var(--default-transition-timing-function));transition-duration:var(--tw-duration, var(--default-transition-duration))}.ease-in-out{--tw-ease: var(--ease-in-out);transition-timing-function:var(--ease-in-out)}@media(width>=40rem){.sm\:hidden{display:none}}}@font-face{font-family:Nunito Variable;font-style:normal;font-display:swap;font-weight:200 1000;src:url("./media/nunito-cyrillic-ext-wght-normal-MF3U6A5A.woff2") format("woff2-variations");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Nunito Variable;font-style:normal;font-display:swap;font-weight:200 1000;src:url("./media/nunito-cyrillic-wght-normal-KKO5CHEH.woff2") format("woff2-variations");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}@font-face{font-family:Nunito Variable;font-style:normal;font-display:swap;font-weight:200 1000;src:url("./media/nunito-vietnamese-wght-normal-BXDRYU5N.woff2") format("woff2-variations");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Nunito Variable;font-style:normal;font-display:swap;font-weight:200 1000;src:url("./media/nunito-latin-ext-wght-normal-VPKFC542.woff2") format("woff2-variations");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Nunito Variable;font-style:normal;font-display:swap;font-weight:200 1000;src:url("./media/nunito-latin-wght-normal-LTD77BFG.woff2") format("woff2-variations");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}[data-category=additive]{--cat: var(--color-additive);--cat-soft: var(--color-additive-soft);--cat-ink: var(--color-additive-ink)}[data-category=multiplicative]{--cat: var(--color-multiplicative);--cat-soft: var(--color-multiplicative-soft);--cat-ink: var(--color-multiplicative-ink)}[data-category=word-problem]{--cat: var(--color-word-problem);--cat-soft: var(--color-word-problem-soft);--cat-ink: var(--color-word-problem-ink)}html,body{height:100%}body{margin:0;background:var(--color-paper);color:var(--color-ink);font-family:var(--font-sans);font-size:1.0625rem;line-height:1.5;touch-action:manipulation;-webkit-font-smoothing:antialiased}h1{font-size:1.75rem;font-weight:800;line-height:1.2;margin:.5rem 0 1rem}h2{font-size:1.375rem;font-weight:800;line-height:1.25;margin:.5rem 0 .75rem}h3{font-size:1.125rem;font-weight:700;margin:.5rem 0}p{margin:0 0 .75rem}.num{font-variant-numeric:tabular-nums;font-weight:800;letter-spacing:.02em}.btn{text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:.4rem;min-height:2.75rem;padding:0 1.1rem;border-radius:999px;font-weight:800;font-size:1rem;border:2px solid transparent;cursor:pointer;transition:transform 80ms ease,background-color .12s ease,box-shadow .12s ease;-webkit-tap-highlight-color:transparent}.btn:active{transform:scale(.96)}.btn:disabled{opacity:.45;cursor:default;transform:none}.btn:focus-visible{outline:3px solid var(--color-brand);outline-offset:2px}.btn-primary{background:var(--cat, var(--color-brand));color:#fff;box-shadow:0 3px #0000002e}.btn-outline{background:#fff;color:var(--cat-ink, var(--color-ink));border-color:var(--cat, var(--color-line))}.btn-ghost{background:transparent;color:inherit}.btn-round{width:3.25rem;height:3.25rem;min-height:0;padding:0;border-radius:999px;background:#fff;color:var(--color-ink);border-color:var(--color-line);box-shadow:0 2px #1e244014}.card{background:var(--color-card);border-radius:var(--radius-card);box-shadow:var(--shadow-card)}.spinner{width:2rem;height:2rem;border-radius:999px;border:4px solid var(--color-line);border-top-color:var(--color-brand);animation:spin .8s linear infinite}.overlay-backdrop{background:#1e24408c;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.fly-in-right{animation:fly-in-right .35s ease-out}.fly-out-left{animation:fly-out-left .35s ease-in forwards}.scale-in{animation:scale-in .22s cubic-bezier(.34,1.56,.64,1)}@keyframes fly-in-right{0%{transform:translate(60%);opacity:0}to{transform:translate(0);opacity:1}}@keyframes fly-out-left{0%{transform:translate(0);opacity:1}to{transform:translate(-60%);opacity:0}}@keyframes scale-in{0%{transform:scale(.6);opacity:0}to{transform:scale(1);opacity:1}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:1ms!important;transition-duration:1ms!important}}.level-section{margin:0 0 2rem;padding:1.25rem 1rem .5rem;border-radius:var(--radius-card);background:var(--cat-soft);scroll-margin-top:5rem}.level-section>h2{display:flex;align-items:center;gap:.6rem;margin:0 0 1rem;color:var(--cat-ink)}.level-section>h2:before{content:"";width:.9rem;height:.9rem;border-radius:999px;background:var(--cat)}@property --tw-rotate-x{syntax: "*"; inherits: false;}@property --tw-rotate-y{syntax: "*"; inherits: false;}@property --tw-rotate-z{syntax: "*"; inherits: false;}@property --tw-skew-x{syntax: "*"; inherits: false;}@property --tw-skew-y{syntax: "*"; inherits: false;}@property --tw-border-style{syntax: "*"; inherits: false; initial-value: solid;}@property --tw-shadow{syntax: "*"; inherits: false; initial-value: 0 0 #0000;}@property --tw-shadow-color{syntax: "*"; inherits: false;}@property --tw-shadow-alpha{syntax: "<percentage>"; inherits: false; initial-value: 100%;}@property --tw-inset-shadow{syntax: "*"; inherits: false; initial-value: 0 0 #0000;}@property --tw-inset-shadow-color{syntax: "*"; inherits: false;}@property --tw-inset-shadow-alpha{syntax: "<percentage>"; inherits: false; initial-value: 100%;}@property --tw-ring-color{syntax: "*"; inherits: false;}@property --tw-ring-shadow{syntax: "*"; inherits: false; initial-value: 0 0 #0000;}@property --tw-inset-ring-color{syntax: "*"; inherits: false;}@property --tw-inset-ring-shadow{syntax: "*"; inherits: false; initial-value: 0 0 #0000;}@property --tw-ring-inset{syntax: "*"; inherits: false;}@property --tw-ring-offset-width{syntax: "<length>"; inherits: false; initial-value: 0px;}@property --tw-ring-offset-color{syntax: "*"; inherits: false; initial-value: #fff;}@property --tw-ring-offset-shadow{syntax: "*"; inherits: false; initial-value: 0 0 #0000;}@property --tw-outline-style{syntax: "*"; inherits: false; initial-value: solid;}@property --tw-blur{syntax: "*"; inherits: false;}@property --tw-brightness{syntax: "*"; inherits: false;}@property --tw-contrast{syntax: "*"; inherits: false;}@property --tw-grayscale{syntax: "*"; inherits: false;}@property --tw-hue-rotate{syntax: "*"; inherits: false;}@property --tw-invert{syntax: "*"; inherits: false;}@property --tw-opacity{syntax: "*"; inherits: false;}@property --tw-saturate{syntax: "*"; inherits: false;}@property --tw-sepia{syntax: "*"; inherits: false;}@property --tw-drop-shadow{syntax: "*"; inherits: false;}@property --tw-drop-shadow-color{syntax: "*"; inherits: false;}@property --tw-drop-shadow-alpha{syntax: "<percentage>"; inherits: false; initial-value: 100%;}@property --tw-drop-shadow-size{syntax: "*"; inherits: false;}@property --tw-ease{syntax: "*"; inherits: false;}@keyframes spin{to{transform:rotate(360deg)}}@layer properties{@supports ((-webkit-hyphens: none) and (not (margin-trim: block))) or ((-moz-orient: inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-rotate-x: initial;--tw-rotate-y: initial;--tw-rotate-z: initial;--tw-skew-x: initial;--tw-skew-y: initial;--tw-border-style: solid;--tw-shadow: 0 0 #0000;--tw-shadow-color: initial;--tw-shadow-alpha: 100%;--tw-inset-shadow: 0 0 #0000;--tw-inset-shadow-color: initial;--tw-inset-shadow-alpha: 100%;--tw-ring-color: initial;--tw-ring-shadow: 0 0 #0000;--tw-inset-ring-color: initial;--tw-inset-ring-shadow: 0 0 #0000;--tw-ring-inset: initial;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-offset-shadow: 0 0 #0000;--tw-outline-style: solid;--tw-blur: initial;--tw-brightness: initial;--tw-contrast: initial;--tw-grayscale: initial;--tw-hue-rotate: initial;--tw-invert: initial;--tw-opacity: initial;--tw-saturate: initial;--tw-sepia: initial;--tw-drop-shadow: initial;--tw-drop-shadow-color: initial;--tw-drop-shadow-alpha: 100%;--tw-drop-shadow-size: initial;--tw-ease: initial}}}