:root{--ink:#13222b;--muted:#60717b;--blue:#0a80bb;--blue2:#085f8d;--ice:#eef8fc;--line:#dce8ed;--white:#fff;--shadow:0 12px 30px rgba(10,48,68,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.65}.wrap{width:min(1160px,calc(100% - 40px));margin:auto}
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.head-inner{min-height:74px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;white-space:nowrap}.brand-mark{width:42px;height:42px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(145deg,var(--blue),#51b8df);color:#fff;font-weight:900;letter-spacing:-1px}.brand strong{display:block;font-size:16px;line-height:1.05}.brand small{display:block;font-size:11px;letter-spacing:.18em;color:var(--blue);margin-top:4px}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px}.nav>a,.dropdown button{border:0;background:none;color:var(--ink);text-decoration:none;font:inherit;font-size:14px;padding:12px 10px;cursor:pointer}.dropdown{position:relative}.drop{display:none;position:absolute;top:100%;left:0;min-width:245px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:8px}.dropdown:hover .drop,.dropdown:focus-within .drop{display:block}.drop a{display:block;text-decoration:none;color:var(--ink);padding:9px 11px;border-radius:8px;font-size:14px}.drop a:hover{background:var(--ice);color:var(--blue2)}.nav .shop{background:var(--ink);color:#fff;border-radius:9px;padding:10px 14px;margin-left:6px}.menu-toggle{display:none;margin-left:auto;border:0;background:none;font-size:26px}
.hero{background:linear-gradient(125deg,#f7fcfe 0%,#e8f6fb 58%,#d9f0f8 100%);border-bottom:1px solid var(--line)}.hero-inner{padding:82px 0 74px;max-width:900px;margin-left:auto;margin-right:auto;text-align:center}.eyebrow{font-weight:800;letter-spacing:.16em;font-size:12px;color:var(--blue);margin:0 0 12px}.hero h1{font-size:clamp(38px,6vw,68px);line-height:1.02;letter-spacing:-.045em;margin:0}.lead{font-size:clamp(18px,2.3vw,23px);color:var(--muted);max-width:790px;margin:24px auto 0}
.content{padding:68px 0 90px}.content>section{margin:0 0 72px}.content h2{font-size:clamp(28px,4vw,42px);line-height:1.12;letter-spacing:-.03em;margin:0 0 20px}.content h3{font-size:21px;margin:0 0 8px}.content p{font-size:17px;color:#41545e}.content ul{padding-left:22px}.content li{margin:8px 0;color:#41545e}
.choice-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:-20px!important}.choice{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:.2s}.choice:hover{transform:translateY(-3px);border-color:#a8d6e8}.choice span{font-size:12px;font-weight:800;letter-spacing:.15em;color:var(--blue)}.choice h2{font-size:24px;margin:14px 0 10px}.choice p{font-size:15px;margin:0}
.split{display:grid;grid-template-columns:1.4fr .8fr;gap:44px;align-items:start}.feature{background:#f8fbfc;border-radius:24px;padding:38px}.info-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:var(--shadow)}.info-card strong{font-size:19px}.info-card ul{margin-bottom:0}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.card{border:1px solid var(--line);border-radius:16px;padding:22px;background:#fff;text-decoration:none;color:var(--ink)}.card p{font-size:15px;margin:0}.card:hover{border-color:#abd8e9}
.buttons{display:flex;flex-wrap:wrap;gap:10px;margin-top:25px}.btn{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;padding:13px 19px;border-radius:9px;font-weight:750;font-size:15px}.btn:hover{background:var(--blue2)}.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn.light{background:#fff;color:var(--ink)}.text-link{color:var(--blue2);font-weight:700;text-decoration:none}
.cta{background:var(--ink);color:#fff;padding:42px;border-radius:22px}.cta h2,.cta p{color:#fff}.cta .eyebrow{color:#70caef}
.comparison{display:grid;grid-template-columns:1fr 1fr;gap:18px}.comparison>div{padding:30px;border:1px solid var(--line);border-radius:18px}.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.product{border:1px solid var(--line);border-radius:18px;padding:28px}.product>span{font-size:11px;font-weight:850;letter-spacing:.14em;color:var(--blue)}
.specs{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.specs>div{border:1px solid var(--line);border-radius:13px;padding:18px}.specs span{display:block;color:var(--muted);font-size:13px}.specs strong{display:block;margin-top:4px}
.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;min-width:680px;border:1px solid var(--line)}th,td{padding:16px;text-align:left;border-bottom:1px solid var(--line)}th{background:var(--ice)}td:first-child{font-weight:750}
footer{background:#0e1b22;color:#c7d3d9;padding:55px 0 22px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}.footer-grid>div{display:flex;flex-direction:column;gap:8px}.footer-grid a{color:#c7d3d9;text-decoration:none;font-size:14px}.footer-grid strong{color:#fff}.footer-brand strong{color:#fff}.footer-brand small{color:#62c3e9}.copyright{border-top:1px solid #24353d;margin-top:34px;padding-top:18px;font-size:13px;color:#82959e}
@media(max-width:980px){.menu-toggle{display:block}.nav{display:none;position:absolute;left:0;right:0;top:74px;background:#fff;border-bottom:1px solid var(--line);padding:12px 20px;flex-direction:column;align-items:stretch}.nav.open{display:flex}.dropdown button,.nav>a{text-align:left;width:100%}.drop{display:block!important;position:static;box-shadow:none;border:0;border-left:2px solid var(--line);border-radius:0;margin-left:10px;padding-left:8px}.nav .shop{margin-left:0}.choice-grid,.cards{grid-template-columns:1fr 1fr}.split{grid-template-columns:1fr}.specs{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.wrap{width:min(100% - 28px,1160px)}.hero-inner{padding:58px 0}.content{padding-top:44px}.choice-grid,.cards,.comparison,.product-grid,.specs,.footer-grid{grid-template-columns:1fr}.feature,.cta{padding:26px}.content>section{margin-bottom:52px}.brand strong{font-size:14px}.brand-mark{width:38px;height:38px}}

.editorial-image{margin:0 0 70px}.editorial-image img{display:block;width:100%;aspect-ratio:16/7;object-fit:cover;border-radius:22px;border:1px solid var(--line);background:#eef5f8}.toc-panel{background:#f8fbfc;border:1px solid var(--line);border-radius:20px;padding:30px}.toc-links{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px}.toc-links a{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px;text-decoration:none;color:var(--ink);font-size:14px;font-weight:700}.note{background:#eef8fc;border-left:4px solid var(--blue);padding:18px 20px;border-radius:8px;margin:24px 0}.formula-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:25px 0}.formula-grid>div{border:1px solid var(--line);border-radius:14px;padding:20px}.formula-grid span{display:block;font-size:13px;color:var(--muted)}.formula-grid strong{display:block;font-size:22px;margin-top:4px}.big-formula{font-size:22px!important;font-weight:800;color:var(--ink)!important;background:var(--ice);padding:20px;border-radius:12px}.check-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.check-grid>div{border:1px solid var(--line);border-radius:10px;padding:14px;font-weight:650}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:28px 0 20px}.calc-grid label{font-weight:750;font-size:14px}.calc-grid input,.calc-grid select{display:block;width:100%;margin-top:7px;padding:12px;border:1px solid #cddde4;border-radius:9px;background:#fff;color:var(--ink);font:inherit}.calc-result{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px;padding:24px;border-radius:18px;background:#102630;color:#fff}.calc-result span{display:block;color:#9fc1d0;font-size:13px}.calc-result strong{display:block;font-size:24px;margin-top:5px}.calc-result p{grid-column:1/-1;color:#d8e7ed;margin:8px 0 0;font-size:14px}.example-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.example{border:1px solid var(--line);border-radius:16px;padding:24px}.example>span{font-size:11px;letter-spacing:.14em;color:var(--blue);font-weight:850}.example>strong{display:block;font-size:19px;margin:14px 0}.small,.disclaimer{font-size:14px!important;color:var(--muted)!important}.contact-card{border:1px solid var(--line);border-radius:18px;padding:28px;background:#f8fbfc}.footer-cta{font-weight:800;color:#fff!important;margin-top:4px}@media(max-width:900px){.toc-links,.calc-grid,.check-grid,.example-grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.toc-links,.calc-grid,.check-grid,.example-grid,.formula-grid{grid-template-columns:1fr}.calc-result{grid-template-columns:1fr}.calc-result p{grid-column:1}.editorial-image img{aspect-ratio:4/3}}

.sources{border-top:1px solid var(--line);padding-top:36px}.sources ul{margin:0}.sources a{color:var(--blue2);word-break:break-word}
.editorial-image figcaption{text-align:center;font-size:13px;color:var(--muted);margin-top:8px}