:root{
  --bg:#f5f6f8;--surface:#fff;--ink:#101828;--mut:#475467;--line:#e4e7ec;--line2:#d0d5dd;
  --brand:#1d4ed8;--brand-d:#1e40af;--brand-soft:#eff4ff;
  --ok:#067647;--ok-bg:#ecfdf3;--warn:#93370d;--warn-bg:#fffaeb;--bad:#b42318;--bad-bg:#fef3f2;
  --r:14px;--shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.08);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font:16px/1.6 var(--font);background:var(--bg);color:var(--ink);overflow-x:hidden}
img,svg{max-width:100%}
a{color:var(--brand)}a:hover{color:var(--brand-d)}
:focus-visible{outline:3px solid #84adff;outline-offset:2px;border-radius:6px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:10px 14px;border-radius:8px;z-index:100}.skip:focus{left:8px}

/* header */
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:700;font-size:17px;min-height:44px}
.brand:hover{color:var(--ink)}
.brand svg{flex:none}
.nav{display:flex;gap:4px;align-items:center}
.nav a{color:var(--mut);text-decoration:none;font-size:15px;font-weight:500;padding:10px 12px;border-radius:8px;min-height:44px;display:inline-flex;align-items:center}
.nav a:hover{background:var(--bg);color:var(--ink)}
.nav a.nav-cta{background:var(--brand);color:#fff}.nav a.nav-cta:hover{background:var(--brand-d);color:#fff}
@media(max-width:700px){.nav a.hide-m{display:none}.brand span.long{display:none}}

/* hero */
.hero{padding:44px 0 28px}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--brand);background:var(--brand-soft);padding:4px 10px;border-radius:99px;margin:0 0 14px}
h1{font-size:clamp(28px,5vw,44px);line-height:1.12;letter-spacing:-.02em;margin:0 0 14px;max-width:760px}
.lead{font-size:clamp(17px,2.2vw,20px);color:var(--mut);margin:0 0 18px;max-width:720px}
.chips{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.chips li{display:flex;align-items:center;gap:6px;font-size:14px;color:var(--mut);background:var(--surface);border:1px solid var(--line);padding:6px 12px;border-radius:99px}
.chips svg{color:var(--ok);flex:none}

/* cards */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--shadow)}
.card h2{font-size:20px;line-height:1.25;margin:0 0 4px;letter-spacing:-.01em}
.card .hint{color:var(--mut);font-size:14px;margin:0 0 14px}
section{margin:0 0 28px}
.sec-title{font-size:clamp(22px,3vw,28px);line-height:1.2;letter-spacing:-.015em;margin:0 0 6px}
.sec-sub{color:var(--mut);margin:0 0 16px;max-width:720px}
.calc{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:20px;align-items:start}
.results{position:sticky;top:76px}
@media(max-width:900px){.calc{grid-template-columns:1fr}.results{position:static}.card{padding:18px}}

/* form */
fieldset{border:0;margin:0 0 6px;padding:0;min-width:0}
legend{font-size:13px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--mut);padding:0;margin:14px 0 8px}
fieldset:first-of-type legend{margin-top:6px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:350px){.row2{grid-template-columns:1fr}}
.field{margin-bottom:10px;min-width:0;display:flex;flex-direction:column}
.field label{display:block;font-size:14px;font-weight:600;margin:0 0 5px}
.field .help{display:block;font-size:13px;color:var(--mut);margin-top:4px;line-height:1.35}
.ig{position:relative;display:flex;align-items:center}
.ig input{width:100%;min-height:48px;padding:10px 12px;font:inherit;font-size:16px;color:var(--ink);background:#fff;border:1px solid var(--line2);border-radius:10px;-moz-appearance:textfield;appearance:textfield}
.ig input::-webkit-outer-spin-button,.ig input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.ig input:hover{border-color:#98a2b3}
.ig input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px #d1e0ff}
.ig.pre input{padding-left:30px}.ig.suf input{padding-right:34px}
.ig .u{position:absolute;color:var(--mut);font-size:16px;pointer-events:none}
.ig.pre .u{left:12px}.ig.suf .u{right:12px}

/* results */
.big{font-size:clamp(32px,6vw,44px);font-weight:800;letter-spacing:-.02em;line-height:1.1;margin:4px 0 2px;font-variant-numeric:tabular-nums}
.big.ok{color:var(--ok)}.big.warn{color:var(--warn)}.big.bad{color:var(--bad)}
.big.small{font-size:26px;color:var(--ink)}
.kv{color:var(--mut);font-size:14px;margin:0}
.res-block{padding:14px 0;border-top:1px solid var(--line)}.res-block:first-of-type{border-top:0;padding-top:4px}
.msg{background:var(--brand-soft);border:1px solid #c7d7fe;color:#1e2a5a;border-radius:10px;padding:12px 14px;font-size:15px;margin-top:6px}
.disclaimer{font-size:13px;color:var(--mut);margin:12px 0 0}

/* table */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -2px;border-radius:10px}
table{width:100%;border-collapse:collapse;font-size:15px;font-variant-numeric:tabular-nums}
th,td{padding:11px 10px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
th:last-child,td:last-child{text-align:center}
th{color:var(--mut);font-weight:600;font-size:13px;background:#f9fafb}
tbody tr:last-child td{border-bottom:0}
td.bad{color:var(--bad);font-weight:600}
.pill{display:inline-block;min-width:54px;text-align:center;padding:2px 10px;border-radius:99px;font-size:12px;font-weight:700;letter-spacing:.03em}
.p-ok{background:var(--ok-bg);color:var(--ok)}.p-warn{background:var(--warn-bg);color:var(--warn)}.p-bad{background:var(--bad-bg);color:var(--bad)}
@media(max-width:480px){.row2{gap:10px}.field label{font-size:13.5px}th,td{padding:10px 6px;font-size:14px}.pill{min-width:0;padding:2px 7px}th.opt-col,td.opt-col{display:none}}

/* how it's calculated */
pre.formula,.formula{font-family:var(--mono);font-size:14px;line-height:1.7;background:#0f172a;color:#e2e8f0;border-radius:12px;padding:16px 18px;overflow-x:auto;margin:12px 0;white-space:pre}
.steps{padding-left:20px;margin:8px 0}.steps li{margin-bottom:6px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:800px){.two{grid-template-columns:1fr}}
.tick{list-style:none;padding:0;margin:0}
.tick li{position:relative;padding-left:28px;margin-bottom:8px}
.tick li:before{content:"";position:absolute;left:0;top:5px;width:18px;height:18px;border-radius:50%;background:var(--ok-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.5l3 3 6-6.5' fill='none' stroke='%23067647' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/100% no-repeat}
.privacy{display:flex;gap:14px;align-items:flex-start;background:var(--ok-bg);border:1px solid #abefc6;border-radius:var(--r);padding:16px 18px}
.privacy svg{flex:none;color:var(--ok);margin-top:2px}.privacy p{margin:0}

/* about */
.about{display:flex;gap:16px;align-items:flex-start}
.avatar{flex:none;width:52px;height:52px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:20px}
.about p{margin:0 0 10px}.about p:last-child{margin:0}

/* kit offer */
.offer{border:1px solid #b2ccff;background:linear-gradient(180deg,#f5f8ff,#fff 60%)}
.offer-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:12px;margin-bottom:6px}
.price{font-size:38px;font-weight:800;letter-spacing:-.02em;line-height:1}
.price-note{display:block;font-size:14px;color:var(--mut);font-weight:500;letter-spacing:0;margin-top:4px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 22px;background:var(--brand);color:#fff;font-weight:700;font-size:16px;border-radius:10px;text-decoration:none;border:0;cursor:pointer}
.btn:hover{background:var(--brand-d);color:#fff}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--line2)}.btn.ghost:hover{background:var(--brand-soft);color:var(--brand-d)}
.secure{display:flex;align-items:center;gap:8px;color:var(--mut);font-size:14px;margin:12px 0 0}
.secure svg{flex:none}
.fine{font-size:14px;color:var(--mut);margin:10px 0 0}
@media(max-width:520px){.offer .btn{width:100%}}

/* mobile sticky result */
.minibar{display:none}
@media(max-width:900px){
  .minibar{position:fixed;left:0;right:0;bottom:0;z-index:30;background:#fff;border-top:1px solid var(--line2);box-shadow:0 -4px 12px rgba(16,24,40,.08);padding:8px 16px calc(8px + env(safe-area-inset-bottom));display:flex;justify-content:space-between;align-items:center;gap:12px;transform:translateY(110%);transition:transform .2s}
  .minibar.show{transform:none}
  .minibar b{font-size:20px;font-variant-numeric:tabular-nums}
  .minibar a{min-height:44px;display:inline-flex;align-items:center;font-weight:600;font-size:15px}
}

/* footer */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:32px 0 40px;margin-top:40px;font-size:14px;color:var(--mut)}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:24px}
@media(max-width:700px){.foot{grid-template-columns:1fr}}
.site-footer h3{font-size:13px;letter-spacing:.04em;text-transform:uppercase;color:var(--ink);margin:0 0 8px}
.site-footer a{color:var(--mut)}.site-footer a:hover{color:var(--brand)}
.site-footer ul{list-style:none;margin:0;padding:0}.site-footer li a{display:inline-block;padding:7px 0;min-height:36px}
.site-footer p{margin:0 0 8px}
.legal{border-top:1px solid var(--line);margin-top:20px;padding-top:16px;font-size:13px}

/* article */
.article{max-width:740px;margin:0 auto;padding:36px 20px 20px}
.article h1{font-size:clamp(28px,5vw,40px);margin-bottom:10px}
.byline{color:var(--mut);font-size:15px;margin:0 0 26px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.article h2{font-size:clamp(21px,3vw,26px);line-height:1.25;margin:34px 0 10px;letter-spacing:-.01em}
.article p,.article li{font-size:18px;line-height:1.7}
.article li{margin-bottom:6px}
.article table{font-size:16px;margin:0}
.article .table-scroll{border:1px solid var(--line);background:#fff;margin:14px 0 18px}
.article td{white-space:normal}
.article th:last-child,.article td:last-child{text-align:right}
.article pre{font-family:var(--mono);font-size:14px;line-height:1.7;background:#0f172a;color:#e2e8f0;border-radius:12px;padding:16px 18px;overflow-x:auto}
.article pre code{font-family:inherit}
.callout{background:var(--brand-soft);border:1px solid #c7d7fe;border-radius:var(--r);padding:18px 20px;margin:28px 0}
.callout p{margin:0 0 12px;font-size:17px}.callout p:last-child{margin:0}
.article hr{border:0;border-top:1px solid var(--line);margin:28px 0}
.note-box{font-size:15px;color:var(--mut);background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:24px 0}
.note-box p{font-size:15px;margin:0 0 6px}

/* download page */
.dl{max-width:640px;margin:0 auto;padding:40px 20px}
.dl .card{padding:28px}
.dl h1{font-size:30px}
.dl ul{padding-left:20px}
@media print{.site-header,.minibar,.nav{display:none}}
.minibar .ok{color:var(--ok)}.minibar .warn{color:var(--warn)}.minibar .bad{color:var(--bad)}
.sr{position:absolute;left:-999px;width:1px;height:1px;overflow:hidden}
@media(max-width:480px){.formula,pre.formula{font-size:12.5px;padding:14px}}
.article th{white-space:normal;vertical-align:bottom}
@media(max-width:560px){.article table{font-size:14.5px}.article th,.article td{padding:9px 7px}}
.article td,.article th{line-height:1.4}