:root{--bg:#f7f9f9;--surface:#fff;--text:#172326;--muted:#53656a;--line:#d8e1e2;--teal:#087f75;--teal-dark:#05645d;--teal-soft:#e8f6f4;--amber:#9a5b00;--amber-soft:#fff5df;--blue:#075ea8;--danger:#a12828;--radius:8px;--shadow:0 8px 24px #17232612;color:var(--text);background:var(--bg);letter-spacing:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;line-height:1.55}a{color:var(--blue);text-underline-offset:3px}button,input,select{font:inherit;min-height:44px;color:var(--text);background:#fff;border:1px solid #9aabad;border-radius:6px}input,select{width:100%;padding:.65rem .75rem}button{cursor:pointer;padding:.65rem 1rem;font-weight:700}.primary{background:var(--teal);border-color:var(--teal);color:#fff}.primary:hover{background:var(--teal-dark)}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline-offset:2px;outline:3px solid #f2a900}.shell{width:min(1100px,100% - 2rem);margin-inline:auto}.site-header{border-bottom:1px solid var(--line);background:#fff}.nav{justify-content:space-between;align-items:center;gap:1rem;min-height:64px;display:flex}.brand{color:var(--text);font-weight:800;text-decoration:none}.nav nav,.footer-grid nav{flex-wrap:wrap;gap:1rem;display:flex}.nav nav a{color:var(--muted);font-weight:650;text-decoration:none}.skip-link{z-index:10;background:#fff;padding:.7rem;position:absolute;top:-5rem;left:1rem}.skip-link:focus{top:1rem}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.language-control select{width:auto;min-width:150px;padding:.4rem 2rem .4rem .6rem}.hero{padding:2rem 0 1rem}.hero h1{max-width:820px;margin:0 0 .65rem;font-size:clamp(2rem,5vw,3.25rem);line-height:1.08}.lede{color:var(--muted);max-width:760px;margin:0;font-size:1.08rem}.calculator{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);margin:1.25rem 0 2rem;padding:clamp(1rem,3vw,1.5rem)}.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.field label,.field-label{margin-bottom:.35rem;font-weight:700;display:block}.hint{color:var(--muted);margin:.25rem 0;font-size:.88rem}.span-2{grid-column:1/-1}.controls{flex-wrap:wrap;align-items:center;gap:.75rem;margin-top:1rem;display:flex}.check{align-items:center;gap:.55rem;min-height:44px;display:flex}.check input{width:20px;min-height:20px}.result{background:var(--teal-soft);border-left:4px solid var(--teal);border-radius:4px;min-height:172px;margin-top:1.25rem;padding:1rem 1.25rem}.result h2{color:var(--teal-dark);margin:0;font-size:1rem}.result-main{margin:.35rem 0;font-size:clamp(1.75rem,5vw,2.5rem);font-weight:850;line-height:1.15}.metrics{flex-wrap:wrap;gap:1.5rem;display:flex}.metric strong{font-size:1.15rem;display:block}.error{color:var(--danger);font-weight:650}.notice{background:var(--amber-soft);border-left:4px solid var(--amber);padding:.8rem 1rem}.section{border-top:1px solid var(--line);padding:2.5rem 0}.section h2{margin-top:0;font-size:clamp(1.5rem,4vw,2rem)}.prose{max-width:760px}.cards{grid-template-columns:repeat(3,1fr);gap:1rem;display:grid}.card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:1rem}.card h3{margin-top:0}.examples button{color:var(--teal-dark);background:#fff;border-color:#82aaa6}.timeline{grid-template-columns:auto 1fr auto;align-items:center;gap:.75rem;margin:1rem 0;display:grid}.timeline-line{background:var(--teal);border-radius:8px;height:8px}.row{grid-template-columns:120px 1fr 1fr 1fr auto;gap:.5rem;margin-bottom:.6rem;display:grid}footer{border-top:1px solid var(--line);color:var(--muted);background:#edf2f2;margin-top:3rem;padding:2rem 0}.footer-grid{justify-content:space-between;gap:2rem;display:flex}.footer-grid p{margin:.25rem 0}@media (max-width:720px){.nav{flex-direction:column;align-items:flex-start;padding:.8rem 0}.nav nav{font-size:.9rem}.grid,.grid-3,.cards{grid-template-columns:1fr}.row{grid-template-columns:1fr 1fr}.row button{grid-column:2}.footer-grid{flex-direction:column}.hero{padding-top:1.4rem}}@media (max-width:360px){.shell{width:min(100% - 1rem,1100px)}.calculator{padding:.8rem}.controls button{width:100%}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media (forced-colors:active){.result,.notice{border:2px solid canvastext}}