*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:#1f2937;background:#f8fafc;line-height:1.65}a{color:#075985}header,footer{background:#0f172a;color:#fff;padding:1rem 5vw}header a,footer a{color:#bae6fd}.nav{display:flex;gap:1rem;flex-wrap:wrap;align-items:center}.brand{font-weight:800;font-size:1.2rem;margin-right:auto}.wrap{max-width:1100px;margin:auto;padding:2rem 5vw}.hero{background:#e0f2fe;padding:3rem 5vw}.hero h1{max-width:800px;font-size:clamp(2rem,5vw,3.5rem);line-height:1.1}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}.card{background:#fff;border:1px solid #dbeafe;border-radius:12px;padding:1.2rem;box-shadow:0 2px 8px #0f172a12}.notice{border-left:4px solid #0284c7;background:#f0f9ff;padding:1rem;margin:1rem 0}.muted{color:#64748b}.sources{font-size:.92rem;border-top:1px solid #cbd5e1;margin-top:2rem;padding-top:1rem}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;background:#fff}th,td{border:1px solid #cbd5e1;padding:.65rem;text-align:left;vertical-align:top}th{background:#e0f2fe}label{display:block;font-weight:700;margin:.6rem 0 .2rem}input,select,button{font:inherit;padding:.6rem;border:1px solid #94a3b8;border-radius:6px}button{background:#0369a1;color:#fff;cursor:pointer}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}.result{font-size:1.4rem;font-weight:800;background:#ecfeff;padding:1rem;margin-top:1rem}.skip{position:absolute;left:-9999px}.skip:focus{left:1rem;top:1rem;background:#fff;padding:.5rem}