:root{--ink:#17202a;--muted:#617080;--line:#dfe6ec;--bg:#f7f9fb;--card:#fff;--accent:#146c5b;--accent2:#0f574a;--soft:#e9f4f0;--max:1120px}
*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}
a{color:inherit;text-decoration:none}.wrap{max-width:var(--max);margin:auto;padding:0 22px}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.nav{height:68px;display:flex;align-items:center;justify-content:space-between}.brand{font-weight:800;font-size:21px;letter-spacing:-.5px}.brand span{color:var(--accent)}nav{display:flex;gap:25px;font-size:14px;font-weight:650}nav a:hover,.text-link:hover{color:var(--accent)}
.hero{background:linear-gradient(180deg,#edf7f3,#f7f9fb);padding:86px 0 76px}.eyebrow{font-size:12px;letter-spacing:1.5px;font-weight:800;color:var(--accent);margin:0 0 8px}.hero h1{font-size:clamp(40px,6vw,68px);line-height:1.02;letter-spacing:-2.8px;max-width:760px;margin:0 0 22px}.lead{font-size:19px;color:var(--muted);max-width:720px}.narrow{max-width:700px}.hero-actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}.button{display:inline-block;padding:12px 18px;border-radius:9px;background:var(--accent);color:#fff;font-weight:750}.button.secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}.section{padding-top:62px;padding-bottom:62px}.section-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:24px}.section h2,.band h2{font-size:32px;letter-spacing:-1px;margin:0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px;transition:transform .15s,box-shadow .15s}.card:hover{transform:translateY(-2px);box-shadow:0 8px 25px #16202a12}.card h2,.card h3{margin:5px 0 8px}.card p{color:var(--muted);margin:0}.icon{font-size:27px;color:var(--accent)}.band{background:#172a27;color:#fff;padding:62px 0}.two-col{display:grid;grid-template-columns:1.3fr .7fr;gap:70px}.band p{color:#d2dfdc}.checklist{border-left:1px solid #ffffff33;padding-left:28px}.checklist p{margin:8px 0}.article-preview{max-width:760px}.text-link{color:var(--accent);font-weight:800}footer{background:#fff;border-top:1px solid var(--line);padding:38px 0 22px;color:var(--muted)}.footer-grid{display:flex;justify-content:space-between;gap:30px}.footer-grid>div:last-child{display:flex;gap:18px;flex-wrap:wrap}.copyright{font-size:12px;margin-top:25px;padding-top:18px;border-top:1px solid var(--line)}
.page{padding-top:62px;padding-bottom:80px}.page h1{font-size:48px;letter-spacing:-1.8px;line-height:1.1}.article{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px;max-width:820px}.article h2{margin-top:32px}.muted{color:var(--muted)}
.calculator-layout{display:grid;grid-template-columns:1fr .9fr;gap:22px;align-items:start}.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:25px}.panel h2{margin-top:0}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.field label{display:block;font-size:13px;font-weight:750;margin-bottom:6px}.field input,.field select{width:100%;padding:11px 12px;border:1px solid #cbd5dc;border-radius:8px;font:inherit;background:#fff}.field small{display:block;color:var(--muted);margin-top:4px}.calculate{border:0;background:var(--accent);color:#fff;border-radius:8px;padding:12px 17px;font-weight:800;font-size:15px;cursor:pointer;margin-top:18px}.result{background:var(--soft);border:1px solid #cde5dd;border-radius:12px;padding:20px;margin-top:18px}.result strong{font-size:30px;display:block;color:var(--accent2)}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mini{padding:12px;background:#fff;border-radius:9px}.mini b{display:block;font-size:18px}.note{font-size:13px;color:var(--muted)}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:18px}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f1f4f6;border-radius:8px;padding:13px;overflow:auto}
@media(max-width:760px){.grid,.calculator-layout,.two-col{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.hero{padding:62px 0}.hero h1{letter-spacing:-1.8px}.section-head,.footer-grid{display:block}.footer-grid>div:last-child{margin-top:20px}.nav{height:auto;padding-top:15px;padding-bottom:15px;align-items:flex-start}.nav nav{gap:13px}.page h1{font-size:38px}}