:root{--blue:#2563eb;--blue-dark:#1e40af;--ink:#172033;--muted:#5b6475;--line:#dbe3ef;--soft:#f4f7fb;--white:#fff;--success:#0f766e;--radius:18px;--shadow:0 12px 35px rgba(35,61,110,.11);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--soft);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;line-height:1.6;background:linear-gradient(180deg,#eff6ff 0,#f8fafc 420px,#fff 100%)}a{color:var(--blue-dark);text-underline-offset:3px}a:hover{text-decoration-thickness:2px}button,input,select{font:inherit}.skip-link{position:absolute;left:-9999px;top:0}.skip-link:focus{left:1rem;top:1rem;z-index:10;background:#fff;padding:.7rem 1rem;border:2px solid var(--blue)}.site-header{background:#fff;border-bottom:1px solid var(--line)}.nav{max-width:1160px;margin:auto;padding:.85rem 1.25rem;display:flex;gap:1.25rem;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;color:var(--ink);text-decoration:none}.brand img{display:block;width:163px;height:40px;object-fit:contain;object-position:left center}.nav-links{display:flex;gap:1.1rem;align-items:center}.nav-links a{text-decoration:none;font-weight:650;color:#364154}.nav-links .button{color:#fff}.container{width:min(1160px,calc(100% - 2rem));margin:auto}.hero{padding:4rem 0 2.5rem;text-align:center}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-weight:800;color:var(--blue-dark);font-size:.76rem}.hero h1{font-size:clamp(2rem,5vw,3.7rem);line-height:1.08;max-width:900px;margin:.6rem auto 1rem;letter-spacing:-.035em}.hero p{max-width:760px;margin:0 auto;color:var(--muted);font-size:clamp(1rem,2vw,1.2rem)}.tool-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,.82fr);gap:1.5rem;align-items:start;margin-bottom:3rem}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(1.1rem,3vw,2rem)}.card h2,.card h3{line-height:1.25;margin-top:0}.form-grid{display:grid;grid-template-columns:1fr minmax(130px,.65fr);gap:1rem}.field{display:flex;flex-direction:column;gap:.4rem;margin-bottom:1rem}.field label,.field legend{font-weight:750}.field small,.hint{color:var(--muted)}input,select{min-height:48px;width:100%;border:1px solid #aeb9c9;border-radius:10px;padding:.65rem .75rem;background:#fff;color:var(--ink)}input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid rgba(37,99,235,.35);outline-offset:2px;border-color:var(--blue)}.preset-row{display:flex;flex-wrap:wrap;gap:.55rem;margin:.25rem 0 1rem}.preset{border:1px solid #afbdd0;background:#fff;border-radius:999px;padding:.5rem .75rem;cursor:pointer;color:#30405a}.preset:hover{background:#eff6ff;border-color:#60a5fa}.button{display:inline-flex;justify-content:center;align-items:center;border:0;border-radius:11px;padding:.8rem 1.05rem;background:var(--blue);color:#fff;text-decoration:none;font-weight:800;cursor:pointer}.button:hover{background:var(--blue-dark)}.button.secondary{background:#e8efff;color:var(--blue-dark)}.error{min-height:1.5rem;color:#b42318;font-weight:650}.result-primary{background:linear-gradient(135deg,#eff6ff,#eefdf9);border:1px solid #b9d8f6;border-radius:14px;padding:1.15rem;margin-bottom:1rem}.result-label{display:block;color:var(--muted);font-weight:700;font-size:.9rem}.result-time{display:block;font-size:clamp(1.8rem,5vw,2.8rem);font-weight:850;line-height:1.15;color:#15366b;margin:.15rem 0}.result-range{font-size:1.05rem;font-weight:750;color:var(--success)}.facts{display:grid;grid-template-columns:1fr 1fr;gap:.8rem}.fact{padding:.8rem;border-radius:12px;background:var(--soft)}.fact strong{display:block;font-size:1.1rem}.formula{overflow-wrap:anywhere;background:#172033;color:#f8fafc;padding:.85rem;border-radius:10px;font:500 .9rem/1.5 ui-monospace,SFMono-Regular,Menlo,monospace}.content{max-width:850px;margin:0 auto 4rem}.content section{padding:1.2rem 0;border-top:1px solid var(--line)}.content h2{font-size:clamp(1.45rem,3vw,2rem);line-height:1.2}.content h3{font-size:1.15rem}.example-table{width:100%;border-collapse:collapse;background:#fff}.example-table th,.example-table td{border:1px solid var(--line);padding:.75rem;text-align:left}.example-table th{background:#edf4ff}.callout{border-left:4px solid var(--blue);background:#eff6ff;padding:1rem 1.1rem;border-radius:0 12px 12px 0}.cta{margin:2rem 0;background:#172b4d;color:#fff;border-radius:var(--radius);padding:clamp(1.25rem,4vw,2.2rem);display:flex;justify-content:space-between;align-items:center;gap:1.5rem}.cta h2{margin:0 0 .4rem}.cta p{margin:0;color:#d7e2f3}.footer{border-top:1px solid var(--line);background:#fff;padding:2rem 0;color:var(--muted)}.footer-inner{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}.noscript{background:#fff4e5;border:1px solid #f5c77d;padding:1rem;border-radius:10px}.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:780px){.tool-grid{grid-template-columns:1fr}.nav-links a:not(.button){display:none}.hero{padding-top:2.6rem}.form-grid{grid-template-columns:1fr}.facts{grid-template-columns:1fr}.cta{align-items:flex-start;flex-direction:column}.cta .button{width:100%}}@media(max-width:390px){.container{width:min(100% - 1rem,1160px)}.card{padding:1rem}.nav{padding:.7rem .75rem}.hero h1{font-size:2rem}.preset{font-size:.9rem}.result-time{font-size:1.75rem}.example-table{font-size:.88rem}.example-table th,.example-table td{padding:.5rem}}