:root{--max: 820px;--ink: #1a1a1a;--muted: #555;--light: #777;--accent: #1a5e9a;--accent-dark: #154d80;--bg: #fff;--bg-alt: #f7f9fc;--border: #dde3ec;--radius: 6px;--shadow: 0 1px 4px rgba(0,0,0,.08)}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.65;background:var(--bg);font-size:16px}.container{max-width:var(--max);margin:0 auto;padding:1.5rem 1.1rem 3.5rem}.site-header{background:var(--bg);border-bottom:2px solid var(--accent);position:sticky;top:0;z-index:100}.site-header-inner{max-width:var(--max);margin:0 auto;padding:.65rem 1.1rem;display:flex;flex-wrap:wrap;align-items:center;gap:.75rem 1.5rem}.site-header .logo{font-weight:800;font-size:1.25rem;text-decoration:none;color:var(--accent);letter-spacing:-.5px;flex-shrink:0}.site-header nav{display:flex;flex-wrap:wrap;gap:.25rem .9rem;font-size:.92rem}.site-header nav a{color:var(--ink);text-decoration:none;padding:.25rem 0;border-bottom:2px solid transparent}.site-header nav a:hover{border-bottom-color:var(--accent);color:var(--accent)}a{color:var(--accent)}a:hover{color:var(--accent-dark)}h1{font-size:1.8rem;line-height:1.25;margin:.25rem 0 .75rem;font-weight:700}h2{font-size:1.2rem;font-weight:700;margin:2rem 0 .6rem;color:#111}h3{font-size:1rem;font-weight:600;margin:1.25rem 0 .35rem}p{margin:.6rem 0 .9rem}ul,ol{padding-left:1.4rem;margin:.5rem 0 1rem}li{margin-bottom:.3rem}.intro{font-size:1.05rem;color:var(--muted);margin-bottom:1.5rem;max-width:680px}.breadcrumb{font-size:.85rem;color:var(--light);margin-bottom:1.1rem}.breadcrumb a{color:var(--light)}.home-hero{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:1.6rem 1.4rem 1.4rem;margin-bottom:2rem}.home-hero h1{margin-top:0;font-size:1.75rem}.home-hero p{color:var(--muted);max-width:640px;margin-bottom:0}.calc-category{margin-bottom:2.5rem}.calc-category h2{font-size:1.05rem;text-transform:uppercase;letter-spacing:.05em;color:var(--light);border-bottom:1px solid var(--border);padding-bottom:.4rem;margin-bottom:.9rem}.calc-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.7rem}.calc-card{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:.85rem 1rem;text-decoration:none;color:var(--ink);transition:border-color .15s,box-shadow .15s;display:block}.calc-card:hover{border-color:var(--accent);box-shadow:var(--shadow);color:var(--accent)}.calc-card-title{font-weight:600;font-size:.95rem}.calc-card-desc{font-size:.82rem;color:var(--light);margin-top:.25rem;line-height:1.4}.why-strip{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:1.4rem;margin:2rem 0}.why-strip h2{margin-top:0}.why-list{list-style:none;padding:0;margin:.75rem 0 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.6rem}.why-list li{padding:.6rem .8rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);font-size:.9rem;margin:0}.why-list li:before{content:"✓ ";color:var(--accent);font-weight:700}.calculator-tool{border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem 1.4rem 1.4rem;margin:1.5rem 0;background:var(--bg-alt);box-shadow:var(--shadow)}.calc-fields{display:grid;gap:.7rem}.calc-fields label{display:flex;flex-direction:column;font-size:.9rem;font-weight:500;gap:.25rem;color:#333}.calc-fields input{padding:.5rem .65rem;border:1px solid var(--border);border-radius:4px;font-size:1rem;background:var(--bg)}.calc-fields input:focus{outline:2px solid var(--accent);border-color:var(--accent)}.calculator-tool button{margin-top:1.1rem;padding:.55rem 1.4rem;border:0;border-radius:4px;background:var(--accent);color:#fff;font-size:1rem;font-weight:600;cursor:pointer;letter-spacing:.01em}.calculator-tool button:hover{background:var(--accent-dark)}.calculator-tool output{display:block;margin-top:1rem;font-weight:700;font-size:1.15rem;color:var(--accent);min-height:1.5em;padding:.5rem .7rem;background:var(--bg);border:1px solid var(--border);border-radius:4px}.content-section{border-top:1px solid var(--border);padding-top:1.4rem;margin-top:1.6rem}.formula-box{background:var(--bg-alt);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius);padding:.9rem 1.1rem;margin:.9rem 0 1.1rem;font-family:Courier New,Courier,monospace;font-size:.97rem;overflow-x:auto}.faq{border-top:1px solid var(--border);padding-top:1.4rem;margin-top:1.6rem}.faq-item{border-bottom:1px solid var(--border);padding-bottom:.9rem;margin-bottom:.9rem}.faq-item:last-child{border-bottom:none}.faq-item h3{font-size:1rem;margin:0 0 .35rem;color:#111}.faq-item p{margin:0;font-size:.95rem;color:var(--muted)}.related{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.1rem;margin-top:2rem}.related h2{margin-top:0;font-size:1rem;color:var(--light);text-transform:uppercase;letter-spacing:.05em}.related ul{list-style:none;padding:0;margin:.5rem 0 0;display:flex;flex-wrap:wrap;gap:.5rem}.related ul li{margin:0}.related ul li a{display:inline-block;padding:.35rem .75rem;background:var(--bg);border:1px solid var(--border);border-radius:20px;font-size:.88rem;text-decoration:none;color:var(--accent)}.related ul li a:hover{background:var(--accent);color:#fff}.inline-disclaimer{border:1px solid #e8c44a;background:#fffdf0;border-radius:var(--radius);padding:.75rem 1rem;font-size:.85rem;color:#5a4f00;margin-top:1.5rem}.inline-disclaimer strong{color:#3d3500}.calc-list-hub{list-style:none;padding:0;margin:1rem 0}.calc-list-hub li{border-bottom:1px solid var(--border);padding:.75rem 0}.calc-list-hub li:last-child{border-bottom:none}.calc-list-hub a{font-weight:600;text-decoration:none;font-size:1rem}.calc-list-hub a:hover{text-decoration:underline}.calc-list-hub .calc-list-desc{font-size:.9rem;color:var(--muted);display:block;margin-top:.15rem}.guide-section{border:1px solid var(--border);border-radius:var(--radius);padding:1.2rem 1.3rem;margin-bottom:1.4rem;background:var(--bg)}.guide-section h2{margin-top:0}.guide-section .tool-link{display:inline-block;margin-top:.5rem;font-size:.9rem;font-weight:600}.content-page h2{border-bottom:1px solid var(--border);padding-bottom:.4rem}.content-page section{margin-bottom:1.8rem}.site-footer{border-top:2px solid var(--border);background:var(--bg-alt);margin-top:3rem;padding:2rem 1.1rem 1.5rem}.site-footer-inner{max-width:var(--max);margin:0 auto}.footer-nav{display:flex;flex-wrap:wrap;gap:2rem 3rem;margin-bottom:1.5rem}.footer-col{display:flex;flex-direction:column;gap:.35rem;min-width:120px}.footer-col h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.07em;color:var(--light);margin:0 0 .4rem}.footer-col a{font-size:.9rem;color:var(--ink);text-decoration:none}.footer-col a:hover{color:var(--accent)}.footer-bottom{border-top:1px solid var(--border);padding-top:1rem;display:flex;flex-wrap:wrap;gap:.5rem;justify-content:space-between;align-items:baseline}.copyright{color:var(--light);font-size:.82rem}.footer-links{display:flex;gap:1rem;flex-wrap:wrap}.footer-links a{font-size:.82rem;color:var(--light)}@media (max-width: 600px){h1{font-size:1.5rem}.home-hero{padding:1.1rem}.calc-card-grid{grid-template-columns:1fr 1fr}.why-list{grid-template-columns:1fr}.site-header nav{font-size:.85rem;gap:.2rem .7rem}}@media (max-width: 400px){.calc-card-grid{grid-template-columns:1fr}}