.ink-calculator-modal{position:fixed;inset:0;z-index:100;background:rgba(12,31,26,.18);display:grid;align-items:end;justify-items:center;padding:16px;overscroll-behavior:contain}
.ink-calculator{position:relative;isolation:isolate;width:min(100%,390px);max-height:calc(100dvh - 24px);overflow:visible;background:#fffdf8;border-radius:18px;padding:14px;box-shadow:0 18px 50px rgba(0,0,0,.28);transform-origin:right bottom;pointer-events:auto}
.ink-calculator::before{content:"";position:absolute;inset:0;z-index:-1;border-radius:inherit;background:#fffdf8;pointer-events:auto}
.ink-calculator-close{position:absolute;z-index:2;right:-7px;top:-18px;width:34px;height:34px;border:2px solid #fffdf8;border-radius:50%;background:#405d51;color:#fff;font-size:1.25rem;font-weight:700;box-shadow:0 3px 9px rgba(0,0,0,.24)}
.ink-calculator-display{display:block;box-sizing:border-box;width:100%;height:46px;min-height:46px;max-height:116px;overflow-y:auto;border:2px solid #91ab9f;border-radius:12px;background:#f6faf7;color:#17251f;padding:7px 9px;font:700 1.15rem/1.45 "Cambria Math","Yu Gothic UI",sans-serif;white-space:pre-wrap;overflow-wrap:anywhere}
.math-stacked-fraction{display:inline-flex;vertical-align:middle;flex-direction:column;align-items:stretch;min-width:1.25em;margin:0 .1em;font-size:90%;line-height:1;text-align:center}.math-stacked-fraction>span:first-child{padding:0 .14em .08em;border-bottom:1.5px solid currentColor}.math-stacked-fraction>span:last-child{padding:.08em .14em 0}
.ink-calculator-keys{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin-top:8px}
.ink-calculator-keys button{min-width:0;height:48px;border:1px solid #cad8d1;border-radius:10px;background:#fff;color:#17342c;font-size:1.12rem;font-weight:750;touch-action:manipulation}
.ink-calculator-keys .operator{background:#eef7f3}.ink-calculator-keys .utility{background:#f7efe8;font-size:.9rem}.ink-calculator-keys .small-key{font-size:.82rem}
.ink-calculator-keys .variable-key{font-family:"Times New Roman","Cambria Math",serif;font-size:1.45rem;font-style:italic;font-weight:700}
.ink-calculator-error{position:absolute;z-index:5;left:12px;right:12px;bottom:14px;margin:0;padding:8px 10px;border-radius:9px;background:rgba(255,244,238,.96);box-shadow:0 2px 10px rgba(70,31,20,.18);color:#a23d2c;font-size:.85rem;font-weight:700;text-align:center;pointer-events:none}.ink-calculator-error:empty{display:none}
.ink-calculator-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:7px}
.ink-calculator-actions button{position:relative;z-index:2;height:52px;border:0;border-radius:12px;font-weight:800;font-size:1.05rem}
.ink-calculator-calculate{background:#e8f0f8;color:#225981}.ink-calculator-transfer{background:#e77c35;color:#fff}
.ink-calculator-settings{margin:18px 0;padding:14px;border:1px solid #cbd9d2;border-radius:14px}.ink-calculator-settings legend{font-weight:800;color:#17342c}.ink-calculator-settings p{margin:10px 0 0;color:#586760;font-size:.9rem}
.guide-category{margin:0 0 22px;padding:12px;background:#f4f8f6;border:1px solid #d5e2dc;border-radius:18px}.guide-category-title{margin:0 0 12px;padding:0 4px 9px;border-bottom:2px solid #a9c5b8;color:#17342c;font-size:1.2rem}.guide-category>.guide-group{margin:10px 0;background:#fff}
.guide-toc{margin:0 0 20px;padding:14px;background:#fff8ee;border:1px solid #ead3b7;border-radius:18px}.guide-toc h2{margin:0 0 10px;color:#70451f;font-size:1.2rem}.guide-toc div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.guide-toc button{min-height:44px;padding:8px;border:1px solid #dfc09c;border-radius:10px;background:#fff;color:#5c4027;font-weight:700;text-align:left}.guide-category{scroll-margin-top:10px}@media(max-width:420px){.guide-toc div{grid-template-columns:1fr}}
@media(min-width:650px){.ink-calculator-modal{justify-items:end;padding:24px}.ink-calculator{margin:0}}
@media(max-width:649px){.ink-calculator-modal{padding:22px 6px 0}.ink-calculator{padding:10px;border-radius:16px 16px 0 0;transform-origin:center bottom}.ink-calculator-close{right:-2px;top:-18px}.ink-calculator-keys{gap:4px;margin-top:5px}.ink-calculator-keys button{height:42px}.ink-calculator-actions{gap:6px;margin-top:5px}.ink-calculator-actions button{height:46px}.ink-calculator-error{bottom:8px}}
@media(orientation:landscape) and (pointer:coarse){.ink-calculator-modal{align-items:start;justify-items:end;padding:0}.ink-calculator{box-sizing:border-box;display:flex;flex-direction:column;height:100dvh;max-height:100dvh;border-radius:16px 0 0 16px;transform-origin:right top}.ink-calculator-close{left:-38px;right:auto;top:50%;transform:translateY(-50%)}.ink-calculator-actions{margin-top:auto}.ink-calculator-error{bottom:8px}}
@media(orientation:landscape) and (pointer:coarse){body.scratch-fullscreen-active .ink-calculator-modal{background:transparent;pointer-events:none}body.scratch-fullscreen-active .ink-calculator{pointer-events:auto}}