:root{--teal:#087d76;--dark:#123b44;--muted:#52727a;--soft:#f4f8f7;--line:#e1ecea;--white:#fff;--warn:#fff8e8}
*{box-sizing:border-box}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:1.75}a{color:var(--teal)}.site-head{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.head-in{max-width:1100px;margin:auto;min-height:68px;padding:10px 20px;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{font-size:20px;font-weight:900;text-decoration:none;color:var(--dark)}.brand span{color:var(--teal)}.nav{display:flex;gap:18px;flex-wrap:wrap}.nav a{text-decoration:none;font-weight:800;font-size:14px}.wrap{max-width:940px;margin:0 auto;padding:28px 20px 60px}.crumb{font-size:13px;color:var(--muted);margin-bottom:20px}.crumb a{text-decoration:none;font-weight:700}.hero,.content{background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:0 12px 35px rgba(18,59,68,.05)}.hero{padding:34px}.content{padding:34px;margin-top:18px}.topic{display:inline-flex;gap:8px;align-items:center;background:#eef6f5;border:1px solid #d8e6e4;border-radius:999px;padding:8px 14px;color:var(--teal);font-weight:800;font-size:14px;margin-bottom:16px}h1{font-size:clamp(30px,5vw,46px);line-height:1.12;letter-spacing:-.03em;margin:0 0 14px}h3{font-size:25px;line-height:1.28;margin:38px 0 12px}h4{font-size:19px;line-height:1.35;margin:24px 0 8px}.lead{font-size:18px;color:var(--muted);margin:0}.meta{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px;font-size:13px;color:var(--muted)}.content p,.content li{color:#365a62}.content li{margin:7px 0}.formula{background:var(--soft);border:1px solid #d0e2df;border-left:5px solid var(--teal);padding:16px 18px;border-radius:14px;font-weight:850;margin:15px 0}.example{background:#f7fbfa;border:1px solid var(--line);border-radius:16px;padding:18px;margin:18px 0}.cta{background:linear-gradient(135deg,#087d76,#06655f);color:#fff;border-radius:20px;padding:24px;margin:30px 0}.cta h4{margin:0 0 8px;color:#fff;font-size:22px}.cta p{color:#eef8f7;margin:0 0 16px}.cta a{display:inline-block;background:#fff;color:#087d76;text-decoration:none;padding:11px 17px;border-radius:12px;font-weight:900}.notice{background:var(--warn);border:1px solid #f1d89a;border-radius:16px;padding:16px 18px;color:#765b1e;margin:28px 0}.faq details{border-top:1px solid var(--line);padding:14px 0}.faq summary{font-weight:800;cursor:pointer}.refs{background:var(--soft);border-radius:18px;padding:22px;margin-top:34px}.refs li{margin:12px 0}.related{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.related a{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;text-decoration:none;font-weight:800}.site-foot{background:#123b44;color:#d7edea;padding:30px 20px}.foot-grid{max-width:940px;margin:auto;display:grid;grid-template-columns:1.2fr 1fr 1.3fr;gap:28px}.site-foot h4{color:#fff;margin-top:0}.site-foot a{color:#fff}.site-foot p{margin:0}.foot-links{display:grid;gap:7px}.foot-links a{text-decoration:none}.foot-bottom{max-width:940px;margin:24px auto 0;border-top:1px solid rgba(255,255,255,.15);padding-top:16px;font-size:13px;color:#bdd7d4}
@media(max-width:760px){.head-in{align-items:flex-start;flex-direction:column}.nav{gap:10px}.hero,.content{padding:23px}.wrap{padding-top:18px}.foot-grid{grid-template-columns:1fr}.related{grid-template-columns:1fr}}