:root{
  --paper:#f7f6f3;
  --card:#fff;
  --ink:#101418;
  --ink2:#39424c;
  --muted:#6d7883;
  --line:#e4e1d9;
  --line2:#cfcabc;
  --accent:#0b6b4f;
  --accent-ink:#07513c;
  --accent-soft:#e7f1ed;
  --alert:#a3341c;
  --shadow:0 1px 2px rgba(16,20,24,.04), 0 12px 32px -16px rgba(16,20,24,.18);
  --r:14px;
  --sp:8px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

*{box-sizing:border-box}
[hidden]{display:none !important}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font:400 16px/1.6 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-feature-settings:"cv05" 1,"ss01" 1;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{margin:0;letter-spacing:-.02em;line-height:1.15;font-weight:600}
p{margin:0}
a{color:inherit}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- top bar ---------- */
.bar{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px clamp(16px,4vw,40px);
  background:rgba(247,246,243,.86);
  backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line);
}
.mark{display:flex;align-items:baseline;gap:7px;text-decoration:none;font-size:15px}
.mark-a{
  font-weight:700;letter-spacing:.06em;font-size:11px;
  background:var(--ink);color:var(--paper);
  padding:3px 6px;border-radius:5px;
}
.mark-b{color:var(--muted);letter-spacing:-.01em}
.bar-right{display:flex;align-items:center;gap:18px}
.chip{
  font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--accent-ink);background:var(--accent-soft);
  border:1px solid #cfe3db;border-radius:999px;padding:3px 9px;font-weight:600;
}
.bar-link{font-size:13.5px;color:var(--muted);text-decoration:none;border-bottom:1px solid transparent;padding-bottom:1px}
.bar-link:hover{color:var(--ink);border-color:var(--line2)}
.mini{
  display:none;align-items:center;
  font-variant-numeric:tabular-nums;font-weight:700;font-size:14.5px;
  letter-spacing:-.01em;color:var(--accent-ink);
  background:var(--accent-soft);border:1px solid #cfe3db;border-radius:999px;
  padding:4px 11px;
}

/* ---------- shell ---------- */
main{max-width:1160px;margin:0 auto;padding:clamp(24px,4vw,52px) clamp(16px,4vw,40px) 80px}
html{scroll-behavior:smooth}
[id]{scroll-margin-top:72px}

.head{max-width:720px;margin-bottom:clamp(24px,3vw,36px)}
h1{font-size:clamp(30px,4.4vw,46px);letter-spacing:-.035em}
.dek{margin-top:12px;color:var(--ink2);font-size:clamp(15px,1.5vw,17px);line-height:1.6;max-width:62ch}

.grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:clamp(24px,3.4vw,56px);align-items:start}

/* ---------- form ---------- */
.form{display:flex;flex-direction:column;gap:2px}
.block{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:20px clamp(16px,2vw,22px);
  margin-bottom:12px;
}
.block-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.block-head h2{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
.hint{font-size:12px;color:var(--muted)}
.blocknote{font-size:12.5px;color:var(--muted);margin:-4px 0 14px;line-height:1.5}

.seg{display:inline-flex;background:#f1efe9;border-radius:9px;padding:3px;gap:2px}
.seg-opt{position:relative;cursor:pointer}
.seg-opt input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}
.seg-opt span{
  display:block;padding:5px 13px;border-radius:7px;font-size:13px;color:var(--ink2);
  transition:background .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease);
}
.seg-opt input:checked+span{background:var(--card);color:var(--ink);box-shadow:0 1px 2px rgba(16,20,24,.12);font-weight:600}
.seg-opt input:focus-visible+span{outline:2px solid var(--accent);outline-offset:2px}

.row{display:grid;grid-template-columns:1fr;gap:14px}
.row.two{grid-template-columns:1fr 1fr}
.row+.row{margin-top:14px}

.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.lab{font-size:12.5px;color:var(--ink2);font-weight:500}
.inp{
  display:flex;align-items:center;gap:2px;
  background:#fbfaf7;border:1px solid var(--line2);border-radius:9px;
  padding:0 12px;height:46px;
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease),background .16s var(--ease);
}
.inp:focus-within{border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(11,107,79,.12)}
.inp .cur{color:var(--muted);font-size:15px}
.inp.is-pct .cur{display:none}
.inp input{
  flex:1;min-width:0;border:0;background:transparent;outline:0;
  font:inherit;font-size:16px;font-variant-numeric:tabular-nums;
  color:var(--ink);padding:0;height:100%;
}
.inp input::placeholder{color:#a8b0b8}
.inp input[aria-invalid="true"]{color:var(--alert)}
.field:has(input[aria-invalid="true"]) .inp{border-color:var(--alert);box-shadow:0 0 0 3px rgba(163,52,28,.1)}

.sel{position:relative;display:block}
.sel select{
  appearance:none;-webkit-appearance:none;width:100%;height:46px;
  border:1px solid var(--line2);border-radius:9px;background:#fbfaf7;
  padding:0 34px 0 12px;font:inherit;font-size:15px;color:var(--ink);
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.sel select:focus{outline:0;border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(11,107,79,.12)}
.sel:after{
  content:"";position:absolute;right:13px;top:50%;width:7px;height:7px;
  border-right:1.6px solid var(--muted);border-bottom:1.6px solid var(--muted);
  transform:translateY(-70%) rotate(45deg);pointer-events:none;
}

.note{font-size:11.5px;color:var(--muted);line-height:1.45}
.err{font-size:11.5px;color:var(--alert)}

.check{display:flex;gap:9px;align-items:flex-start;margin-top:14px;font-size:13.5px;color:var(--ink2);cursor:pointer}
.check input{margin:3px 0 0;accent-color:var(--accent);width:15px;height:15px}

.toggle{
  font:inherit;font-size:12.5px;color:var(--accent-ink);background:none;border:0;
  padding:2px 0;cursor:pointer;border-bottom:1px dashed #b6cfc5;
}
.toggle:hover{border-bottom-style:solid}

.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:6px;padding:4px 2px}
.btn{
  font:inherit;cursor:pointer;border-radius:10px;border:1px solid transparent;
  transition:transform .12s var(--ease),background .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn.primary{
  background:var(--ink);color:var(--paper);font-weight:600;font-size:15px;
  padding:13px 22px;letter-spacing:-.01em;
}
.btn.primary:hover{background:#1c242c}
.btn.quiet{background:transparent;border-color:var(--line2);color:var(--ink2);padding:12px 16px;font-size:14px}
.btn.quiet:hover{border-color:var(--muted);color:var(--ink)}
.kbd-hint{font-size:12px;color:var(--muted)}
kbd{
  font:inherit;font-size:11px;border:1px solid var(--line2);border-bottom-width:2px;
  border-radius:4px;padding:1px 5px;background:#fff;color:var(--ink2);
}

/* ---------- result stub ---------- */
.out{position:sticky;top:78px}
.stub{
  position:relative;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r);box-shadow:var(--shadow);
  padding:26px clamp(16px,2vw,24px) 20px;
  overflow:hidden;
}
.perf{
  position:absolute;inset:0 0 auto 0;height:9px;
  background:
    radial-gradient(circle at 6px -1px, transparent 6px, var(--card) 6.5px) 0 0/14px 9px repeat-x,
    var(--paper);
  border-bottom:1px dashed var(--line2);
}
.stub-head{display:flex;justify-content:space-between;align-items:baseline;margin:12px 0 2px}
.stub-label{font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
.stub-freq{font-size:12px;color:var(--muted)}
.big{
  font-size:clamp(38px,4.6vw,52px);font-weight:600;letter-spacing:-.035em;
  font-variant-numeric:tabular-nums;line-height:1.05;margin:2px 0 16px;
  transition:color .2s var(--ease);
}
.big.flash{color:var(--accent)}

.strip{display:flex;height:8px;border-radius:99px;overflow:hidden;background:#efece4;margin-bottom:8px}
.strip span{display:block;height:100%;transition:flex-grow .35s var(--ease)}
.strip .s1{background:#222a31}
.strip .s2{background:#c9c2b2}
.strip .s3{background:var(--accent)}
.strip-key{display:flex;gap:14px;font-size:11.5px;color:var(--muted);margin-bottom:18px;flex-wrap:wrap}
.strip-key span{display:flex;align-items:center;gap:5px}
.strip-key i{width:7px;height:7px;border-radius:2px;display:block}
.strip-key .k1{background:#222a31}.strip-key .k2{background:#c9c2b2}.strip-key .k3{background:var(--accent)}

.facts{display:grid;grid-template-columns:1fr 1fr;gap:14px 14px;margin:0 0 16px;padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.facts dt{font-size:11.5px;color:var(--muted);letter-spacing:.02em}
.facts dd{margin:2px 0 0;font-size:18px;font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:-.012em}
.facts div:nth-child(-n+2) dd{font-size:21px}

.lines{width:100%;border-collapse:collapse;font-size:13.5px}
.lines tr{border-bottom:1px solid #f0ede6}
.lines tr:last-child{border-bottom:0}
.lines td{padding:7px 0;vertical-align:baseline}
.lines td:first-child{color:var(--ink2)}
.lines td:last-child{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.lines tr.gross td{color:var(--ink);font-weight:600;padding-top:2px}
.lines tr.neg td:last-child{color:var(--alert)}
.lines tr.net td{font-weight:700;color:var(--ink);padding-top:11px;border-top:1px solid var(--line)}
.lines tr.sub td:first-child{padding-left:12px;font-size:12.5px;color:var(--muted)}

.stub-foot{display:flex;align-items:center;gap:10px;margin-top:14px;padding-top:14px;border-top:1px dashed var(--line2)}
.btn.copy{
  background:var(--accent-soft);border:1px solid #cfe3db;color:var(--accent-ink);
  font-size:13px;font-weight:600;padding:9px 14px;border-radius:9px;
}
.btn.copy:hover{background:#dcece6}
.btn.copy.done{background:var(--accent);border-color:var(--accent);color:#fff}
.copy-note{font-size:12px;color:var(--accent-ink);opacity:0;transition:opacity .2s var(--ease)}
.copy-note.on{opacity:1}

.fine{font-size:11.5px;color:var(--muted);margin-top:12px;line-height:1.55;padding:0 2px}

/* ---------- prose ---------- */
.prose{max-width:none;margin-top:clamp(48px,6vw,84px)}
.prose h2{font-size:clamp(20px,2.4vw,26px);margin:44px 0 12px;max-width:34ch}
.prose h2:first-child{margin-top:0}
.prose p{color:var(--ink2);font-size:15.5px;margin-bottom:14px;max-width:68ch}
.prose table{width:100%;border-collapse:collapse;font-size:13.5px;margin:6px 0 8px}
.prose table.src{table-layout:fixed}
.src th:nth-child(1){width:30%}
.src th:nth-child(2){width:24%}
.src th:nth-child(3){width:29%}
.src th:nth-child(4){width:17%}
.src th{
  text-align:left;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
  font-weight:600;padding:0 10px 8px 0;border-bottom:1px solid var(--line2);
}
.src td{padding:9px 10px 9px 0;border-bottom:1px solid var(--line);color:var(--ink2);vertical-align:top}
.src td:nth-child(2){font-variant-numeric:tabular-nums;color:var(--ink)}
.src td:last-child{white-space:nowrap;color:var(--muted);font-size:12.5px}

.callout{
  border-left:3px solid var(--accent);background:#fff;border-radius:0 10px 10px 0;
  padding:14px 16px;font-size:14px;color:var(--ink2);margin:18px 0 8px;line-height:1.6;max-width:78ch;
}
.callout b{color:var(--ink);display:block;margin-bottom:4px}

.steps{padding-left:0;list-style:none;counter-reset:s;margin:0 0 8px;max-width:78ch}
.steps li{
  counter-increment:s;position:relative;padding-left:34px;margin-bottom:12px;
  font-size:14.5px;color:var(--ink2);line-height:1.6;
}
.steps li:before{
  content:counter(s);position:absolute;left:0;top:1px;
  width:22px;height:22px;border-radius:50%;background:var(--accent-soft);color:var(--accent-ink);
  font-size:11.5px;font-weight:700;display:flex;align-items:center;justify-content:center;
}
.steps b{color:var(--ink)}

.faq{margin-top:4px;border-top:1px solid var(--line);max-width:84ch}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  cursor:pointer;list-style:none;padding:14px 26px 14px 0;position:relative;
  font-size:15px;font-weight:550;color:var(--ink);
}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{
  content:"";position:absolute;right:4px;top:22px;width:7px;height:7px;
  border-right:1.6px solid var(--muted);border-bottom:1.6px solid var(--muted);
  transform:rotate(45deg);transition:transform .18s var(--ease);
}
.faq details[open] summary:after{transform:rotate(-135deg)}
.faq p{padding:0 26px 14px 0;margin:0;font-size:14.5px;color:var(--ink2)}

.foot{margin-top:64px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:12.5px;line-height:1.65}
.foot-src{margin-top:6px;color:#8a949d}

:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .grid{grid-template-columns:1fr}
  .form{display:contents}
  .pay-block{order:1}
  .out{position:static;order:2;margin-bottom:8px}
  .form .block:not(.pay-block){order:3}
  .form .actions{order:4}
  .mini{display:inline-flex}
  .stub{padding:20px 16px 16px}
  .prose{margin-top:40px}
}
@media (max-width:560px){
  .bar{padding:11px 14px}
  .bar-link{display:none}
  main{padding:20px 14px 64px}
  .row.two{grid-template-columns:1fr}
  .block{padding:16px 14px;border-radius:12px}
  .facts{grid-template-columns:1fr 1fr;gap:10px}
  .big{font-size:40px}
  .src td:last-child{display:none}
  .src th:last-child{display:none}
  .src th:nth-child(1){width:30%}
  .src th:nth-child(2){width:34%}
  .src th:nth-child(3){width:36%}
  .actions{gap:8px}
  .btn.primary{flex:1;text-align:center;padding:14px 16px}
  .kbd-hint{display:none}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.001ms !important;animation-duration:.001ms !important}
}