*{box-sizing:border-box}:root{color-scheme:light;--ink:#183b3f;--muted:#5e7375;--line:#cddcda;--paper:#fff;--green:#216b62}body{margin:0;background:#f4f6f1;color:var(--ink);font-family:ui-rounded,"Avenir Next",system-ui,sans-serif;line-height:1.45}button,input,select{font:inherit}button,select,input{min-height:48px}button{border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-weight:650;padding:.65rem .8rem;cursor:pointer;touch-action:manipulation}button:disabled{opacity:.4;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid #bc6a22;outline-offset:3px}button:hover:not(:disabled){filter:brightness(0.96)}.shell{max-width:760px;margin:auto;padding:18px 20px 0}header{padding:4px 0 14px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;width:fit-content}.brand b{display:grid;place-items:center;width:44px;height:44px;background:var(--ink);color:#fff;border-radius:13px;font-size:33px;line-height:1;position:relative}.brand b span{font-size:18px;position:absolute;right:4px;top:1px;color:#f5c677}.brand strong{display:block;font-size:15px}.brand small{display:block;font-size:12px;color:var(--muted)}h1{font-size:clamp(25px,4.2vw,34px);letter-spacing:-0.04em;line-height:1.1;margin:0 0 8px}.quiet{color:var(--muted);font-size:14px;margin:4px 0 12px}.intro{margin-bottom:12px}.settings{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;background:white;border:1px solid var(--line);border-radius:17px;padding:14px}.mode-label{display:flex;flex-direction:column;font-size:12px;font-weight:700;gap:4px}.settings select{background:#f5f8f5;border:1px solid var(--line);border-radius:10px;padding:6px 10px;color:var(--ink);font-size:15px}.operands{display:flex;align-items:center;gap:8px;align-self:end}.operand input{width:72px;border:1px solid var(--line);border-radius:10px;padding:6px;text-align:center;font-size:22px;font-weight:700;color:var(--ink);background:#fff}.operand input::-webkit-inner-spin-button{appearance:none}.times{font-size:24px}.apply{background:#ecf3ef}.phases{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin:18px 0}.phases button{font-size:13px;padding:.5rem 3px;border-color:transparent;background:transparent}.phases .active{background:var(--ink);color:#fff}.stage-heading h2{font-size:21px;margin:14px 0 5px;letter-spacing:-0.02em}.stage-heading p{min-height:21px}.content{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;margin-bottom:16px}.area-block{margin:auto;max-width:520px}.dimension{font-size:14px;font-weight:650;text-align:center}.area-frame{height:210px;margin:14px auto;padding:1px}.area-frame svg{display:block;width:100%;height:100%;overflow:visible}.parts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:18px}.part{border:2px solid transparent;border-radius:12px;background:var(--part);font-size:clamp(14px,3vw,18px);padding:10px 3px;min-height:54px}.part.selected{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}.zero-note{margin:8px 0 0;text-align:center;font-size:12px}.calculation{padding-top:16px;text-align:center}.row-sum{font-size:18px;margin:6px 0}.total{font-size:clamp(21px,4vw,28px);font-weight:750;padding-top:10px;border-top:1px solid var(--line);margin-top:12px}.compact .area-frame{height:140px}.stack-card{min-height:280px;display:grid;place-items:center}.stack{width:min(100%,360px)}.stack-line{display:grid;grid-template-columns:minmax(0,1fr) 100px;align-items:center;gap:14px;padding:5px 0}.stack-number{font:700 clamp(27px,6vw,40px) / 1.4 ui-monospace,SFMono-Regular,Consolas,monospace;text-align:right;font-variant-numeric:tabular-nums;white-space:pre}.stack-label{font-size:13px;color:var(--muted)}.rule .stack-number{border-bottom:2px solid var(--ink);padding-bottom:5px}.stack-total{color:var(--green)}.controls{display:grid;grid-template-columns:1fr 1fr 1.16fr;gap:8px;position:sticky;bottom:0;z-index:3;background:#f4f6f1ee;backdrop-filter:blur(10px);padding:12px 0 max(12px,env(safe-area-inset-bottom));margin-top:16px}.controls button{padding:10px 2px;font-size:14px;min-height:52px}.primary{background:var(--green);color:white;border-color:var(--green)}.new-example{border-color:#82a79f;background:#e1eee7}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:420px){.shell{padding:15px 12px 0}header{padding-bottom:12px}.settings{padding:12px;gap:12px}.mode-label{width:100%}.settings select{width:100%}.operands{width:100%;justify-content:center}.operand input{width:68px}.area-frame{height:180px}.content{padding:14px 12px}.phases{gap:2px}.phases button{font-size:12px}.stack-line{grid-template-columns:minmax(0,1fr) 88px;gap:12px}.controls{gap:6px}.controls button{font-size:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}.number-editor{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.number-editor summary{min-height:48px;padding:12px 14px;font-weight:700;cursor:pointer;font-size:16px;touch-action:manipulation}.number-editor summary:focus-visible{outline:3px solid #bc6a22;outline-offset:-3px}.number-editor .settings{border:0;border-top:1px solid var(--line);border-radius:0}.number-editor[open] summary{background:#edf3ef}@media(max-height:650px) and (max-width:420px){header{padding-bottom:8px}.intro{display:none}.area-frame{height:150px}.stage-heading p{font-size:13px}.phases{margin:12px 0}.stage-heading h2{font-size:20px}}