:root{--bg:#f6f8fb;--ink:#172033;--muted:#5d6b7e;--nav:#10243e;--accent:#18a0a8;--accent2:#f4a62a;--card:#fff;--line:#dce4ee;--soft:#eaf6f6;--max:1460px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.64}a{color:#086d79}a:hover{text-decoration-thickness:2px}.wrap{width:min(var(--max),calc(100% - 32px));margin:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:#fff;padding:10px;z-index:50}.top{background:var(--nav);color:#fff;border-bottom:4px solid var(--accent)}.top .inner{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:13px;color:#fff;text-decoration:none}.brand img{width:48px;height:48px}.brand strong{display:block;font-size:1.02rem}.brand span{display:block;font-size:.82rem;opacity:.8}.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.nav .inner{display:flex;gap:4px;flex-wrap:wrap;align-items:center}.nav a{padding:12px 11px;text-decoration:none;font-weight:650;color:#24364d;border-bottom:3px solid transparent}.nav a:hover,.nav a[aria-current=page]{border-color:var(--accent)}.hero{background:linear-gradient(135deg,#10243e 0%,#173b58 58%,#0d6870 100%);color:#fff;padding:54px 0}.hero-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:38px;align-items:center}.hero h1{font-size:clamp(2.1rem,4.5vw,4rem);line-height:1.04;margin:.2rem 0 1rem}.hero p{font-size:1.08rem;color:#dceaf2;max-width:820px}.hero img{width:100%;height:auto;max-height:360px}.kicker{display:inline-block;font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;font-weight:800;color:#9de3e6}.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 17px;border-radius:10px;background:var(--accent);color:#fff;text-decoration:none;font-weight:750}.btn.alt{background:#fff;color:#18354f}.section{padding:42px 0}.section h2{font-size:clamp(1.55rem,2.5vw,2.25rem);margin:0 0 12px}.lede{font-size:1.08rem;color:var(--muted);max-width:950px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:18px;margin-top:22px}.card{background:var(--card);border:1px solid var(--line);border-radius:15px;padding:22px;box-shadow:0 6px 20px rgba(19,42,67,.045)}.card h3{margin:.1rem 0 .6rem;line-height:1.25}.card p{color:var(--muted);margin:.4rem 0}.badge{display:inline-block;padding:4px 8px;border-radius:999px;background:var(--soft);color:#0d6870;font-size:.75rem;font-weight:750}.main{padding:36px 0}.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:30px}.article{background:#fff;border:1px solid var(--line);border-radius:15px;padding:clamp(22px,4vw,44px)}.article h1{font-size:clamp(2rem,4vw,3.2rem);line-height:1.1;margin-top:.25rem}.article h2{margin-top:2rem;line-height:1.2}.article h3{margin-top:1.5rem}.article li{margin:.45rem 0}.aside .card{position:sticky;top:70px}.note{border-left:5px solid var(--accent);background:var(--soft);padding:14px 16px;margin:20px 0;border-radius:8px}.warn{border-left-color:var(--accent2);background:#fff7e8}.formula{background:#14263c;color:#fff;padding:16px;border-radius:10px;overflow:auto;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.toolbox{background:#fff;border:1px solid var(--line);border-radius:15px;padding:24px;margin-top:22px}.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:15px}.field label{display:block;font-weight:700;margin-bottom:5px}.field input,.field select,.field textarea{width:100%;padding:11px;border:1px solid #bac8d8;border-radius:8px;font:inherit;background:#fff}.actions{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.actions button{border:0;border-radius:9px;padding:11px 16px;background:var(--accent);color:#fff;font-weight:750;cursor:pointer}.actions button.secondary{background:#e7edf4;color:#1d324a}.result{background:#eef7f8;border:1px solid #b7dfe2;border-radius:10px;padding:17px;min-height:58px}.result strong{font-size:1.18rem}.tablewrap{overflow:auto}table{width:100%;border-collapse:collapse;margin:18px 0}th,td{padding:10px;border:1px solid var(--line);text-align:left}th{background:#eef3f8}.checklist label{display:flex;gap:10px;align-items:flex-start;margin:10px 0;padding:10px;background:#f8fafc;border:1px solid var(--line);border-radius:8px}.footer{background:#10243e;color:#d6e0ea;margin-top:48px;padding:34px 0}.footer a{color:#bdecef}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}.small{font-size:.88rem;color:var(--muted)}.footer .small{color:#aebdca}.crumb{font-size:.9rem;color:var(--muted);margin-bottom:12px}.tool-list{columns:2;column-gap:28px}.tool-list li{break-inside:avoid;margin:.45rem 0}@media(max-width:900px){.hero-grid,.layout,.footer-grid{grid-template-columns:1fr}.aside .card{position:static}.hero img{max-width:620px}.tool-list{columns:1}}@media(max-width:650px){.wrap{width:min(var(--max),calc(100% - 22px))}.top .inner{min-height:70px}.brand span{display:none}.nav{position:static}.nav .inner{overflow-x:auto;flex-wrap:nowrap}.nav a{white-space:nowrap}.article{padding:20px}.hero{padding:36px 0}.fields{grid-template-columns:1fr}}