*,*::before,*::after{box-sizing:border-box}
:root{
  --ink:#1b1b19; --ink-2:#4a4a45; --ink-3:#78786f;
  --paper:#fbfaf7; --card:#ffffff; --line:#e2e0d8; --line-2:#cfccc0;
  --brand:#1f5136; --brand-2:#2c6b47; --brand-tint:#eaf1ec;
  --warn:#a8480f; --warn-tint:#fdf0e7;
  --bad:#a02a20; --bad-tint:#fbeeec;
  --ok:#1f6b3f; --ok-tint:#e9f4ee;
  --r:10px;
}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-variant-numeric:tabular-nums;
}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
a{color:var(--brand-2);text-underline-offset:2px}
a:hover{color:var(--brand)}
h1,h2,h3{line-height:1.25;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:1.85rem;font-weight:600}
h2{font-size:1.25rem;font-weight:600;margin-top:2em}
h3{font-size:1.02rem;font-weight:600;margin-top:1.6em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.25em}
li{margin:.35em 0}
strong{font-weight:600}
small{font-size:.82rem}

.topbar{background:var(--brand);color:#fff}
.topbar .wrap{display:flex;align-items:center;gap:14px;min-height:56px;flex-wrap:wrap}
.brand{font-weight:600;font-size:1.05rem;color:#fff;text-decoration:none;letter-spacing:-.01em}
.brand span{opacity:.6;font-weight:400}
.nav{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap}
.nav a{color:#dfe9e1;text-decoration:none;font-size:.9rem;padding:7px 10px;border-radius:6px;white-space:nowrap}
.nav a:hover,.nav a[aria-current]{background:#2c6b47;color:#fff}
@media(max-width:560px){
  /* six items: a deliberate 3 + 3 grid reads better than a 5 + 1 accidental wrap */
  .nav{width:100%;margin-left:0;display:grid;grid-template-columns:repeat(3,1fr);gap:2px}
  .nav a{font-size:.83rem;padding:6px 4px;text-align:center}
}

main{padding:32px 0 56px}
.lede{font-size:1.02rem;color:var(--ink-2);margin-bottom:1.4em}

.calc{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;margin:22px 0}
.calc h2{margin-top:0;font-size:1.1rem}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:560px){.grid{grid-template-columns:1fr}}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-size:.86rem;font-weight:500;color:var(--ink-2)}
.field .hint{font-size:.78rem;color:var(--ink-3);line-height:1.4}
input[type=number],select{
  font:inherit;font-size:16px;padding:9px 11px;border:1px solid var(--line-2);
  border-radius:8px;background:#fff;color:var(--ink);width:100%;-webkit-appearance:none;appearance:none
}
select{background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%2378786f' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 11px center;background-size:11px;padding-right:32px}
input:focus,select:focus{outline:2px solid var(--brand-2);outline-offset:1px;border-color:var(--brand-2)}
.btn{
  font:inherit;font-size:1rem;font-weight:500;padding:11px 22px;border:0;border-radius:8px;
  background:var(--brand);color:#fff;cursor:pointer;margin-top:18px;width:100%
}
.btn:hover{background:var(--brand-2)}
.btn.ghost{background:transparent;color:var(--brand);border:1px solid var(--line-2);width:auto;margin-left:8px}

.result{margin-top:20px;border-top:1px solid var(--line);padding-top:18px}
.result[hidden]{display:none}
.headline{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:4px}
.headline b{font-size:2rem;font-weight:600;letter-spacing:-.02em;color:var(--brand)}
.headline span{color:var(--ink-3);font-size:.9rem}
.rows{display:grid;gap:0;margin-top:14px;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.row{display:flex;justify-content:space-between;gap:12px;padding:9px 13px;font-size:.92rem;border-bottom:1px solid var(--line)}
.row:last-child{border-bottom:0}
.row:nth-child(odd){background:#fcfcf9}
.row b{font-weight:600}
.row.dim{color:var(--ink-2)}

.flag{display:flex;gap:9px;padding:11px 13px;border-radius:8px;font-size:.9rem;margin-top:14px;line-height:1.5}
.flag.ok{background:var(--ok-tint);color:#12482a}
.flag.warn{background:var(--warn-tint);color:#7a3309}
.flag.bad{background:var(--bad-tint);color:#7a1a13}
.flag .ico{font-weight:600;flex:none}

.note{font-size:.82rem;color:var(--ink-3);border-left:2px solid var(--line-2);padding-left:12px;margin:16px 0}

table{width:100%;border-collapse:collapse;font-size:.9rem;margin:16px 0}
.th-wrap,.tw{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:16px 0}
.tw table{margin:0;min-width:470px}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
th{font-weight:600;font-size:.82rem;color:var(--ink-2);text-transform:uppercase;letter-spacing:.04em}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}

.cards{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:22px 0}
@media(max-width:600px){.cards{grid-template-columns:1fr}}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:16px 18px;text-decoration:none;color:inherit;transition:border-color .12s}
.card:hover{border-color:var(--brand-2)}
.card b{display:block;font-weight:600;margin-bottom:3px;color:var(--brand)}
.card span{font-size:.88rem;color:var(--ink-2);line-height:1.5}

@media(max-width:560px){
  h1{font-size:1.5rem}
  h2{font-size:1.14rem}
  .lede{font-size:.97rem}
  main{padding:24px 0 44px}
  .calc{padding:17px 15px}
}

.faq{border-top:1px solid var(--line);padding-top:6px}
.faq details{border-bottom:1px solid var(--line);padding:12px 0}
.faq summary{font-weight:500;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+ ";color:var(--brand-2);font-weight:600}
.faq details[open] summary::before{content:"– "}
.faq p{margin:10px 0 0;font-size:.94rem;color:var(--ink-2)}

.crumbs{font-size:.82rem;color:var(--ink-3);margin-bottom:14px}
.crumbs a{color:var(--ink-3)}
.crumbs span{margin:0 6px;opacity:.5}

footer{border-top:1px solid var(--line);padding:26px 0 40px;font-size:.85rem;color:var(--ink-3)}
footer a{color:var(--ink-2);text-decoration:none;margin-right:16px;display:inline-block;margin-bottom:8px}
footer a:hover{color:var(--brand);text-decoration:underline}
footer p{margin:14px 0 0;font-size:.8rem;line-height:1.55}
footer .legal{margin-top:4px;padding-top:10px;border-top:1px solid var(--line);opacity:.85}
footer .legal a{font-size:.78rem;margin-right:14px;margin-bottom:4px}
.links{list-style:none;display:flex;flex-wrap:wrap;gap:6px 20px;padding:0;margin:8px 0 0}
.links a{font-size:.92rem}

.skip{position:absolute;left:-9999px}
.skip:focus{left:20px;top:8px;background:#fff;padding:8px 14px;z-index:9;border-radius:6px}