:root{--teal:#087d76;--teal-dark:#06655f;--dark:#123b44;--muted:#52727a;--soft:#f4f8f7;--line:#e1ecea;--white:#fff;--warn:#fff8e8;--warn-line:#f1d89a}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--dark);background:#f8faf9;line-height:1.65}a{color:var(--teal)}
.site-head{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}.head-in{max-width:1180px;margin:auto;min-height:74px;padding:10px 22px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--dark);min-width:max-content}.brand-mark{width:42px;height:42px;border-radius:14px;background:#0a8d84;color:#fff;display:grid;place-items:center;font-size:23px;font-weight:900}.brand-copy strong{display:block;font-size:19px;line-height:1.05}.brand-copy strong span{color:var(--teal)}.brand-copy small{display:block;margin-top:4px;font-size:10px;letter-spacing:.14em;color:#6d858b;font-weight:800}.desktop-nav{display:flex;align-items:center;gap:18px;margin-left:auto}.desktop-nav a{text-decoration:none;font-weight:780;color:var(--dark);font-size:14px}.desktop-nav a:hover{color:var(--teal)}.menu-toggle{display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;align-items:center;justify-content:center;flex-direction:column;gap:5px}.menu-toggle span{width:20px;height:2px;background:var(--dark);border-radius:4px}.wrap{max-width:1000px;margin:0 auto;padding:26px 20px 64px}.crumb{display:flex;gap:8px;flex-wrap:wrap;color:var(--muted);font-size:13px;margin-bottom:18px}.crumb a{text-decoration:none;font-weight:750}.hero{background:#fff;border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:0 12px 35px rgba(18,59,68,.05)}.topic{display:inline-flex;align-items:center;gap:9px;background:#eef6f5;border:1px solid #d8e6e4;border-radius:999px;padding:7px 13px;color:var(--teal);font-weight:850;font-size:13px;margin-bottom:14px}.topic-icon{font-size:17px}.hero h1{margin:0 0 10px;font-size:clamp(30px,5vw,46px);line-height:1.1;letter-spacing:-.03em}.hero p{margin:0;color:var(--muted);font-size:17px}.educational{margin-top:17px;background:var(--warn);border:1px solid var(--warn-line);border-radius:14px;padding:13px 15px;color:#765b1e;font-size:13px;font-weight:650}.tool-shell{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:18px;margin-top:18px}.tool-card,.result-card,.editorial{background:#fff;border:1px solid var(--line);border-radius:22px;padding:26px}.tool-card h2,.result-card h2{margin:0 0 18px;font-size:22px}.field{margin:0 0 16px}.field label{display:block;font-size:13px;font-weight:850;color:var(--dark);margin-bottom:7px}.field input,.field select{width:100%;min-height:48px;border:1px solid #cfe1df;border-radius:12px;padding:10px 12px;background:#fff;color:var(--dark);font:inherit;font-size:15px;outline:none}.field input:focus,.field select:focus{border-color:#75b5af;box-shadow:0 0 0 3px rgba(8,125,118,.09)}.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.btn{width:100%;border:0;border-radius:13px;padding:13px 16px;background:var(--teal);color:#fff;font:inherit;font-weight:900;cursor:pointer}.btn:hover{background:var(--teal-dark)}.reset{margin-top:9px;background:#fff;color:var(--teal);border:1px solid #cfe1df}.reset:hover{background:var(--soft)}.result-card{background:linear-gradient(180deg,#fff,#f7fbfa)}.result-empty{color:#7c9499;font-size:14px}.result-main{font-size:38px;line-height:1;font-weight:950;color:var(--teal);letter-spacing:-.03em;margin:8px 0}.result-unit{font-size:14px;color:var(--muted);font-weight:750}.result-note{margin-top:14px;padding:13px 14px;border-radius:13px;background:#eef6f5;color:#365a62;font-size:13px}.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:14px}.result-item{padding:12px;border:1px solid var(--line);background:#fff;border-radius:12px}.result-item small{display:block;color:var(--muted);font-size:11px}.result-item strong{display:block;margin-top:3px;color:var(--dark);font-size:16px}.error{color:#a33d35;background:#fff1ef;border:1px solid #f0c9c4;border-radius:12px;padding:11px 13px;font-size:13px}.editorial{margin-top:18px}.editorial h2{font-size:25px;margin:34px 0 10px}.editorial h2:first-child{margin-top:0}.editorial h3{font-size:19px;margin:24px 0 8px}.editorial p,.editorial li{color:#365a62}.editorial li{margin:7px 0}.formula{padding:15px 17px;border-left:5px solid var(--teal);background:var(--soft);border-radius:13px;font-weight:850;color:var(--dark);margin:12px 0}.refs{background:var(--soft);border-radius:17px;padding:20px;margin-top:28px}.refs h2{margin-top:0}.refs li{margin:12px 0}.refs a{font-weight:800}.faq details{border-top:1px solid var(--line);padding:13px 0}.faq summary{font-weight:850;cursor:pointer}.site-foot{background:#123b44;color:#d7edea;padding:34px 20px}.foot-grid{max-width:1100px;margin:auto;display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:34px}.site-foot h3{margin:0 0 10px;color:#fff;font-size:16px}.site-foot p{margin:0;color:#bdd7d4;font-size:13px}.site-foot a{color:#fff}.foot-links{display:grid;gap:7px}.foot-note{font-size:12px;color:#bdd7d4}.mobile-overlay,.mobile-drawer{display:none}
@media(max-width:800px){.desktop-nav{display:none}.menu-toggle{display:flex}.head-in{padding:9px 15px}.brand-mark{width:40px;height:40px}.brand-copy strong{font-size:18px}.wrap{padding:18px 14px 54px}.hero,.tool-card,.result-card,.editorial{padding:20px;border-radius:18px}.hero h1{font-size:33px}.tool-shell{grid-template-columns:1fr}.row{grid-template-columns:1fr}.foot-grid{grid-template-columns:1fr;gap:24px}.mobile-overlay{display:block;position:fixed;inset:0;background:rgba(13,42,49,.52);opacity:0;pointer-events:none;z-index:80;transition:.2s}.mobile-overlay.is-open{opacity:1;pointer-events:auto}.mobile-drawer{display:flex;position:fixed;top:0;right:0;bottom:0;width:min(91vw,420px);background:#fff;z-index:90;transform:translateX(102%);transition:.23s;flex-direction:column;box-shadow:-18px 0 44px rgba(18,59,68,.18)}.mobile-drawer.is-open{transform:translateX(0)}.drawer-head{display:flex;align-items:center;gap:11px;padding:18px;border-bottom:1px solid var(--line)}.drawer-close{margin-left:auto;border:0;background:transparent;font-size:34px;color:#587279}.drawer-list{padding:18px;overflow:auto;display:grid;gap:9px}.drawer-list a{display:flex;align-items:center;gap:11px;border:1px solid #d8e6e4;border-radius:15px;padding:12px 13px;text-decoration:none;color:var(--dark);font-weight:800}.drawer-list a span:first-child{width:38px;height:38px;border-radius:12px;background:#eef6f5;display:grid;place-items:center}.result-main{font-size:34px}}