:root{font-family:var(--font);font-size:16px;background:var(--ground);color:var(--ink)}
*{box-sizing:border-box}body{margin:0;background:var(--grain),radial-gradient(ellipse at 85% 30%,#fcf7e5,transparent 55%);min-height:100vh}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer;touch-action:manipulation}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #358270;outline-offset:4px}a{color:inherit}button{border:1px solid var(--edge);border-bottom:3px solid #ad9765;background:var(--grain),var(--paper);border-radius:10px;box-shadow:0 2px 2px #675b2a12}button:hover:not(:disabled){filter:brightness(1.035);transform:translateY(-1px)}button:active:not(:disabled){transform:translateY(2px);box-shadow:none}[hidden]{display:none!important}
.site-header{gap:16px}.brand{flex:1;font:800 1.3rem var(--font);text-decoration:none}.site-header nav{display:flex;align-items:center;gap:19px;font-size:12px}.site-header nav a{text-decoration:none}.site-header nav button{padding:8px 14px;font-size:13px;min-height:44px}main{max-width:1220px;padding:28px 34px 60px;margin:auto}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.eyebrow{font-size:10px;font-weight:800;letter-spacing:2px;text-transform:uppercase;color:#687853;margin:0 0 9px}h1,h2,h3,p{margin-top:0}h1{font:700 clamp(27px,3vw,38px)/1.08 var(--font);margin-bottom:9px}.page-heading p:not(.eyebrow){font-size:14px;margin:0;color:var(--muted)}.read-button{font-size:12px;font-weight:650;padding:12px 16px;background:var(--grain),#dfe8c8}.read-button span{margin-left:10px}
.calculator-layout{display:grid;grid-template-columns:minmax(280px,350px) minmax(0,1fr);gap:28px;align-items:start}.calculator{background:var(--grain),linear-gradient(120deg,#e3ce9d,#d6be8d);border:1px solid #bca272;border-bottom:8px solid #a98c5a;border-radius:20px 24px 17px 21px;padding:19px;box-shadow:inset 0 2px #fff3cd,0 5px 0 #c5ac795e,0 13px 23px #675b3021}.machine-heading{display:flex;justify-content:space-between;align-items:center;gap:5px;min-height:24px;font-size:11px;letter-spacing:.5px;font-weight:750;margin-bottom:12px}.paper-flower{color:#69844e;font-size:22px}.machine-heading button{padding:3px 6px;font-size:10px;letter-spacing:0}.display-panel{background:linear-gradient(150deg,#365d4e,#294a3f);color:#fff9e6;border:2px solid #274739;border-radius:11px 13px 9px 10px;box-shadow:inset 0 2px 8px #1b312454;padding:17px 15px 13px;min-height:149px;overflow-wrap:anywhere}.equation{font-size:16px;line-height:1.4;min-height:23px;margin:0 0 5px;color:#d2dfbd}.display-panel output{display:block;font-size:clamp(32px,4vw,52px);line-height:1.15;font-weight:750;letter-spacing:-1px;text-align:right;font-variant-numeric:tabular-nums}.display-panel output.long-value{font-size:27px}.repeat-hint{margin:10px 0 0;font-size:11px;line-height:1.4;color:#e0e6c8;min-height:16px}.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-top:16px}.keypad button{font-size:25px;min-width:0;height:57px;font-weight:650;background:var(--grain),linear-gradient(#fff9e8,#f3e6c8);border-radius:9px 12px 8px 10px;border-bottom-width:4px;box-shadow:inset 0 2px #fffcf2,0 2px 1px #6b4d2420}.keypad .utility{font-size:20px;background:var(--grain),#eadbb8}.keypad .clear{color:#974b3f;background:var(--grain),#ecc8ad}.keypad .operation{background:var(--grain),#dce6bf;color:#3e643d}.keypad .operation[aria-pressed=true]{background:#a8c797;outline:2px solid #577b4d;outline-offset:-3px}.keypad .equals{grid-column:span 2;background:var(--grain),var(--gold);border-color:#b4964d;color:#38543a;font-size:32px}.quick-starts{margin-top:18px}.quick-starts>span{display:block;font-size:10px;font-weight:800;letter-spacing:.8px;margin-bottom:8px}.quick-starts>div{display:flex;gap:6px}.quick-starts button{flex:1;padding:7px 3px;font-size:10px;border-radius:7px;background:#f7edce}.quick-starts b{display:block;font-size:16px;margin-top:2px}.club-controls{display:flex;align-items:center;justify-content:space-between;margin:12px 2px 0;gap:10px;font-size:15px}.club-controls button{width:40px;height:36px;font-size:20px}
.math-room{min-height:569px;border:1px solid #c7b68d;border-bottom:5px solid #b9a071;border-radius:17px 24px 15px 21px;background:var(--grain),radial-gradient(ellipse at 50% 75%,#eef0d8,transparent 80%),#fcf6e3;box-shadow:inset 0 3px #fffbed,0 10px 17px #7b6b4220;padding:25px 25px 18px;position:relative;overflow:hidden}.math-room-heading{display:flex;justify-content:space-between;align-items:center;gap:15px}.math-room h2{font:700 27px/1.17 var(--font);margin-bottom:10px;overflow-wrap:anywhere}.room-spark{font-size:30px;color:#c4a452}.calculation-explanation{font-size:14px;line-height:1.55;color:var(--muted);margin-bottom:20px;min-height:23px}.math-picture{min-height:330px;display:grid;align-items:center}.welcome-picture{text-align:center;max-width:370px;margin:auto;color:#6f795b}.welcome-picture>span{font:700 65px var(--font);color:#c9bb89;text-shadow:1px 2px #fff8e4}.welcome-picture p{font-size:15px;line-height:1.6;margin:15px 0}.calc-message{font-size:12px;line-height:1.45;margin:15px 0 0;min-height:17px;color:#526b47}.calc-message.error{padding:11px;background:#f5ddd0;border:1px solid #d6a992;border-radius:8px;color:#803c30}
.club-room{margin-top:32px}.club-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.club-heading h2{font:700 27px var(--font);margin-bottom:16px}.club-heading>p{font-size:12px;line-height:1.6;color:var(--muted);text-align:right}.club-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.club-button{position:relative;display:grid;grid-template-columns:75px 1fr;align-items:center;gap:8px;padding:12px 13px;text-align:left;border-radius:13px 18px 12px 16px;background:var(--grain),#f6eed2;border-bottom-width:5px;min-width:0}.club-button svg{display:block;width:75px;height:82px}.club-button strong{display:block;font:700 19px/1.15 var(--font)}.club-formula{display:block;font-size:11px;line-height:1.45;margin-top:6px;overflow-wrap:anywhere}.club-button[aria-pressed=true]{background:var(--grain),#dfe8c1;outline:3px solid #76905a;outline-offset:2px}.grown-up-notes{border-top:1px solid #a7af8647;margin-top:30px;padding-top:17px;color:#637354;font-size:12px;line-height:1.6}.grown-up-notes summary{cursor:pointer;font-weight:700;margin-bottom:12px}.grown-up-notes p{max-width:900px;margin:9px 0}
.math-visual{text-align:center;min-width:0}.math-pieces{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px}.math-piece{min-width:0;flex:0 1 160px}.math-piece svg{max-width:100%;width:100%;max-height:210px;display:block;margin:auto;overflow:visible}.math-sign{font-size:24px;font-weight:700;color:#81915f}.math-caption{font-size:13px;line-height:1.5;margin:9px 0;color:#4d6647}.math-explanation{font-size:13px;line-height:1.55;margin:15px 0;color:#657354}.math-visual>svg{max-width:100%;max-height:295px;height:auto;display:block;margin:auto;overflow:visible}.club-proof{border-top:1px dashed #b6bb97;margin-top:17px;padding-top:13px}.club-proof svg{max-width:100%;max-height:160px}.math-lots{display:flex;justify-content:center;flex-wrap:wrap;gap:9px}.math-lot{max-width:130px}.math-result{margin-top:13px}.math-visual .math-piece:only-child{flex-basis:230px}svg text{font-family:ui-rounded,system-ui,sans-serif}
.math-piece{margin:0}.math-lots{display:block}.math-equation{display:none}.math-formula{font-weight:750;font-size:19px;margin:5px 0 16px;overflow-wrap:anywhere}.math-repeat-pack,.math-divisor{display:flex;flex-direction:column;justify-content:center;max-width:170px;font-size:14px;padding:12px;background:#e4eacb;border:1px dashed #98a477;border-radius:10px}.math-divisor strong{font-size:25px}.math-repeat-pack p{font-size:11px;line-height:1.5;margin:6px 0 0}.math-cube-layers{margin-top:16px}.math-club>.math-piece{max-width:270px;margin:auto}.math-exact-note{overflow-wrap:anywhere}.calc-message:not(.error){position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip-path:inset(50%)}
@media(min-width:721px) and (max-height:850px){main{padding-top:18px}.page-heading{margin-bottom:17px}h1{font-size:30px}.calculator{padding:14px}.machine-heading{margin-bottom:7px;min-height:20px}.display-panel{min-height:114px;padding:11px 13px}.display-panel output{font-size:40px}.repeat-hint{margin-top:6px}.keypad{gap:7px;margin-top:11px}.keypad button{height:44px;font-size:23px}.keypad .equals{font-size:28px}.quick-starts{margin-top:12px}.quick-starts button{padding:5px}.quick-starts b{display:inline;margin-left:3px;font-size:14px}.math-room{min-height:475px}.math-picture{min-height:285px}}
@media(max-width:1000px){.club-buttons{grid-template-columns:repeat(2,1fr)}.calculator-layout{gap:20px;grid-template-columns:310px minmax(0,1fr)}.math-room{padding:21px 17px}.math-piece{flex-basis:125px}.brand{font-size:20px}}
@media(max-width:720px){.site-header{gap:12px}.brand{font-size:1.15rem}.site-header nav{margin-left:auto;gap:14px}.page-heading{margin-bottom:19px;align-items:end}.page-heading .eyebrow{font-size:9px;letter-spacing:1.5px}.page-heading h1{font-size:28px}.page-heading p:not(.eyebrow){font-size:12px}.read-button{font-size:10px;padding:9px;max-width:96px;flex:none}.read-button span{display:none}main{padding:22px 17px 40px}.calculator-layout{grid-template-columns:minmax(0,1fr);gap:22px}.calculator{width:100%;max-width:430px;margin:auto;padding:16px}.display-panel{min-height:127px}.display-panel output{font-size:44px}.keypad{gap:9px;margin-top:13px}.keypad button{height:54px}.quick-starts{margin-top:14px}.quick-starts>div button{font-size:12px}.quick-starts b{display:inline;margin-left:3px}.math-room{min-height:380px;padding:21px 17px}.math-picture{min-height:220px}.math-room h2{font-size:25px}.math-piece{flex-basis:130px}.club-heading{align-items:start;gap:12px}.club-heading h2{font-size:24px}.club-heading>p{max-width:160px;font-size:11px}.club-buttons{gap:11px}.club-button{grid-template-columns:1fr;text-align:center;justify-items:center;padding:9px;gap:1px}.club-button svg{width:70px;height:75px}.club-button strong{font-size:19px}.club-formula{font-size:11px}.math-pieces{gap:8px}.math-sign{font-size:20px}.calculation-explanation{font-size:13px}.math-explanation{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

.math-lot-equation{gap:16px}.math-lot-sum,.math-negated-sum{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;min-width:0}.math-lot-sum{flex:1 1 240px}.math-lot-sum .math-piece{flex:0 1 130px}.math-negated-sum{border-left:2px solid #81915f;border-right:2px solid #81915f;border-radius:14px;padding:0 8px;flex:1}.math-lot-answer{display:flex;align-items:center;justify-content:center;gap:14px;flex:0 1 190px;min-width:0}.math-lot-answer>.math-sign{color:#3e643d;font-size:34px}.math-lot-answer>.math-piece{flex:0 1 130px}.math-lot-sum>.math-sign{font-size:24px}
@media(max-width:720px){.math-lot-sum{flex-basis:100%}.math-lot-sum .math-piece{flex-basis:92px}.math-lot-answer{flex-basis:150px}.math-lot-answer>.math-piece{flex-basis:92px}}

.picture-zoom{display:flex;align-items:center;justify-content:center;gap:7px;flex-wrap:wrap;margin:0 0 16px}.picture-zoom button{font-size:12px;min-height:44px;padding:7px 10px}.picture-zoom output{font-size:12px;min-width:40px}.math-block-viewport{width:100%;margin-inline:auto;max-height:330px;overflow:auto;border-radius:10px;overscroll-behavior:contain}.math-block-viewport:focus-visible{outline:2px solid #358270;outline-offset:2px}.math-piece .math-block-viewport svg{width:calc(min(100%, var(--fit-width, 480px)) * var(--block-zoom,1));max-width:none;max-height:none;height:auto}.math-visual[data-kind="number"]>.math-piece:has(.math-block-viewport){width:100%;max-width:480px;margin:auto}.math-club>.math-piece:has(.math-block-viewport){max-width:440px}.math-piece:has(.math-block-viewport){flex-basis:190px}.large-fraction-parts{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px}.large-fraction-parts>svg{max-width:90px!important}