:root{--bg:#f6f9ff;--card:#fff;--text:#162033;--muted:#64748b;--blue:#2563eb;--blue2:#1e40af;--green:#16a34a;--orange:#f59e0b;--violet:#7c3aed;--line:#dbe4f0;--soft:#eff6ff;--shadow:0 18px 45px rgba(30,64,175,.12)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;background:radial-gradient(circle at 8% 3%,#e0f2fe 0,transparent 24%),linear-gradient(135deg,#f8fbff,#eef6ff 52%,#f7fff4);color:var(--text)}a{color:#1d4ed8;text-decoration:none}p{line-height:1.78}.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;padding:16px 5%;background:rgba(255,255,255,.88);backdrop-filter:blur(13px);border-bottom:1px solid var(--line)}.brand{font-weight:950;font-size:23px;color:#0f172a}.brand span{text-transform:lowercase}.mainnav{display:flex;gap:18px}.mainnav a{font-weight:850;color:#334155}.menuBtn{display:none;background:#eff6ff;color:#1e40af;border:0;border-radius:14px;padding:10px 14px}.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:32px;padding:70px 5% 35px;align-items:center}.eyebrow{color:var(--blue);font-weight:950;text-transform:uppercase;letter-spacing:.08em;font-size:13px}.hero h1,.pagehead h1{font-size:clamp(36px,6vw,66px);line-height:1.02;margin:10px 0}.hero p,.lead,.pagehead p{font-size:19px;color:#475569}.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px}.btn,button{border:0;border-radius:16px;padding:14px 20px;font-weight:900;cursor:pointer}.primary{background:linear-gradient(135deg,var(--blue),var(--blue2));color:white}.ghost{background:white;color:#1e3a8a;border:1px solid var(--line)}.mathPanel,.calc-card,.note,.result-card,.article,.post-card,.cluster>div,.calc-ui,.adslot,.contactbox,.searchbox,.hub-card,.legal,.featured{background:var(--card);border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow)}.mathPanel{padding:34px}.formula,.badge{width:90px;height:90px;display:grid;place-items:center;border-radius:26px;background:#e0f2fe;color:#0369a1;font-size:46px;font-weight:950}.progress,.bar{height:14px;background:#e5e7eb;border-radius:99px;overflow:hidden}.progress span,.bar span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--green));width:50%}.section,.pagehead{padding:45px 5%}.section h2{font-size:36px}.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.calc-card{padding:24px;transition:.2s;color:var(--text);position:relative;overflow:hidden}.calc-card:before{content:"";position:absolute;right:-28px;top:-28px;width:110px;height:110px;border-radius:50%;background:#dbeafe;opacity:.55}.calc-card:hover{transform:translateY(-4px)}.calc-card .icon{font-size:24px;width:58px;height:58px;border-radius:20px;background:#eff6ff;color:var(--blue);display:grid;place-items:center;font-weight:950;position:relative}.calc-card small{color:var(--green);font-weight:900}.calc-card h3{margin-bottom:6px;position:relative}.calc-card p{color:var(--muted);position:relative}.split{display:grid;grid-template-columns:1fr .8fr;gap:24px}.check li{margin:10px 0}.note{padding:24px}.calculator{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;padding:25px 5%}.calc-ui{padding:26px}label{display:block;font-weight:850;margin:0 0 22px}input[type=range]{width:100%;accent-color:var(--blue);margin:12px 0}input,textarea,select{width:100%;padding:12px;border-radius:12px;border:1px solid var(--line);margin-top:6px;background:white}.result-card{padding:28px}.big{font-size:44px;font-weight:950;color:#0f766e;margin:15px 0}.mini{background:#ecfdf5;color:#166534;margin-top:18px}.content,.article{max-width:1060px;margin:auto}.content table,.article table{width:100%;border-collapse:collapse;background:white;border-radius:18px;overflow:hidden;margin:24px 0}.content th,.content td,.article th,.article td{border:1px solid var(--line);padding:14px;text-align:left}.faq details{background:white;border:1px solid var(--line);border-radius:16px;margin:10px 0;padding:16px}.interlinks,.toc,.filters{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.interlinks a,.toc a,.cluster a,.filterbtn{background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af;padding:10px 12px;border-radius:12px;font-weight:850}.filterbtn.active{background:#1d4ed8;color:white}.posts{padding:25px 5%;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.post-card{padding:22px}.post-card img,.featured img{width:100%;display:block;border-radius:18px;border:1px solid var(--line)}.post-card img{margin-bottom:16px}.article{padding:42px;margin-top:35px}.article h1{font-size:46px}.article p{font-size:18px;line-height:1.86}.article h2{margin-top:34px}.featured{margin:26px 0;overflow:hidden}.featured img{border-radius:0;border:0}.featured figcaption{padding:12px 18px;color:#64748b;font-size:14px}.callout{background:#ecfdf5;border:1px solid #bbf7d0;border-radius:18px;padding:18px;margin:24px 0}.cluster{padding:25px 5%;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.cluster>div{padding:24px;display:flex;flex-direction:column;gap:12px}.adslot{margin:20px 5%;padding:18px;text-align:center;color:#64748b;background:#fbfdff;border-style:dashed}.muted{color:#64748b}.contactbox,.legal{padding:28px;margin:24px auto;max-width:980px}.legal p{line-height:1.85}.searchbox{margin:20px 5%;padding:20px;display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}.hub{padding:25px 5%;display:grid;grid-template-columns:repeat(5,1fr);gap:18px}.hub-card{padding:22px}.hub-card h2{margin-top:0}.formula-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}.formula-strip div{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}.footer{margin-top:50px;padding:35px 5%;background:#0f172a;color:white;display:flex;justify-content:space-between;gap:24px}.footer p{color:#cbd5e1}.footlinks{display:flex;gap:14px;flex-wrap:wrap}.footlinks a{color:white}.admin{max-width:760px;margin:40px auto;background:white;border-radius:28px;padding:30px;box-shadow:var(--shadow)}
@media(max-width:1180px){.grid{grid-template-columns:repeat(3,1fr)}.hub{grid-template-columns:repeat(3,1fr)}}
@media(max-width:900px){.hero,.calculator,.split,.cluster,.searchbox{grid-template-columns:1fr}.grid,.posts,.hub,.formula-strip{grid-template-columns:repeat(2,1fr)}.mainnav{display:none}.menuBtn{display:block}.mainnav.open{display:flex;position:absolute;top:64px;left:5%;right:5%;background:white;border:1px solid var(--line);border-radius:18px;padding:18px;flex-direction:column}.footer{flex-direction:column}}
@media(max-width:560px){.grid,.posts,.hub,.formula-strip{grid-template-columns:1fr}.hero{padding-top:35px}.article h1{font-size:34px}.big{font-size:34px}.formula,.badge{width:70px;height:70px;font-size:32px}}

.section-head{max-width:980px;margin-bottom:24px}.home-search{margin-top:10px}.home-search input{font-size:17px}.hub-card p{color:var(--muted)}

.adslot:empty{display:none}

.hub-card img{width:100%;display:block;border-radius:18px;border:1px solid var(--line);margin-bottom:14px}.calculator + .adslot{margin-top:0}.section.content .featured{max-width:1060px;margin:0 auto 10px}