:root{--ink:#172033;--muted:#667085;--line:#e5e7eb;--bg:#fff;--soft:#f6f8fb;--brand:#2563eb;--brand2:#1d4ed8;--ok:#087443;--radius:18px}*{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;color:var(--ink);background:var(--bg);line-height:1.6}a{color:inherit;text-decoration:none}.wrap{max-width:1120px;margin:auto;padding:0 22px}.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:10}.nav{height:70px;display:flex;align-items:center;justify-content:space-between}.brand{font-size:1.25rem;font-weight:850;letter-spacing:-.04em}.brand span{color:var(--brand)}nav{display:flex;gap:24px;font-size:.95rem;color:#475467}nav a:hover{color:var(--brand)}.hero{padding:82px 0 74px;background:linear-gradient(180deg,#eff6ff 0,#fff 100%)}.hero h1{font-size:clamp(2.5rem,6vw,4.8rem);line-height:1.02;letter-spacing:-.055em;max-width:850px;margin:10px 0 22px}.lead{font-size:1.18rem;color:var(--muted);max-width:750px}.eyebrow{font-size:.76rem;letter-spacing:.14em;font-weight:800;color:var(--brand);margin:0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border:1px solid #cfd6e1;border-radius:12px;background:#fff;font-weight:750}.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}.section{padding:72px 0}.soft{background:var(--soft)}.section h2{font-size:2rem;letter-spacing:-.035em;margin:4px 0 10px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:25px}.search{width:min(320px,100%);padding:12px 14px;border:1px solid #d0d5dd;border-radius:12px;font:inherit}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:#fff;transition:.18s;display:block}.card:hover{transform:translateY(-2px);border-color:#b8c7e8;box-shadow:0 10px 28px #10182812}.card b{display:block;font-size:1.05rem;margin-bottom:5px}.card span{display:block;color:var(--muted);font-size:.92rem}.two{display:grid;grid-template-columns:1.2fr .8fr;gap:60px}.feature-list{display:grid;gap:12px}.feature-list div{padding:18px;border:1px solid var(--line);border-radius:14px;background:#fff}.feature-list b,.feature-list span{display:block}.feature-list span{color:var(--muted);font-size:.9rem}.faq{display:grid;gap:10px;max-width:850px}.faq details{border:1px solid var(--line);padding:16px 18px;border-radius:12px}.faq summary{font-weight:750;cursor:pointer}footer{border-top:1px solid var(--line);padding:38px 0 22px;color:var(--muted)}.footer{display:flex;justify-content:space-between;gap:30px}.footer>div:last-child{display:flex;gap:18px;align-items:start}.copyright{font-size:.82rem;margin-top:28px;padding-top:18px;border-top:1px solid var(--line)}.tool-page{padding:55px 0}.tool-layout{display:grid;grid-template-columns:1fr 1.1fr;gap:30px;align-items:start}.calculator,.info{border:1px solid var(--line);border-radius:20px;background:#fff;padding:25px;box-shadow:0 8px 30px #10182808}.calculator h1{font-size:2.2rem;line-height:1.1;margin:0 0 8px;letter-spacing:-.04em}.muted{color:var(--muted)}label{font-weight:700;font-size:.9rem;display:block;margin:14px 0 6px}input,select{width:100%;padding:11px 12px;border:1px solid #cfd5df;border-radius:10px;font:inherit;background:#fff}.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.course{display:grid;grid-template-columns:1.4fr .8fr .8fr 42px;gap:8px;margin-bottom:9px;align-items:end}.remove{border:1px solid #ddd;background:#fff;border-radius:9px;height:42px;cursor:pointer}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.result{margin-top:20px;padding:18px;border-radius:14px;background:#eff6ff;border:1px solid #bfdbfe}.result strong{font-size:2rem;display:block;color:var(--brand2)}.notice{padding:13px 15px;border-radius:11px;background:#fff7ed;border:1px solid #fed7aa;color:#7c2d12;font-size:.9rem}.info h2{font-size:1.35rem}.info p,.info li{color:#475467}.breadcrumbs{font-size:.85rem;color:var(--muted);margin-bottom:20px}.article{max-width:850px}.article h1{font-size:2.7rem;line-height:1.1;letter-spacing:-.04em}.article h2{margin-top:35px}.article p,.article li{color:#475467}.contact-box{max-width:700px}.hidden{display:none}@media(max-width:850px){.grid{grid-template-columns:repeat(2,1fr)}.two,.tool-layout{grid-template-columns:1fr}.hero{padding:60px 0}.section{padding:52px 0}}@media(max-width:600px){.grid{grid-template-columns:1fr}.nav{height:auto;padding-top:16px;padding-bottom:16px;align-items:flex-start}.nav nav{gap:12px;font-size:.85rem}.hero h1{font-size:2.7rem}.section-head{align-items:stretch;flex-direction:column}.course{grid-template-columns:1fr 1fr 1fr 38px}.course input{min-width:0}.footer{flex-direction:column}.footer>div:last-child{flex-wrap:wrap}.row{grid-template-columns:1fr}}