*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#ffffff; --surface:#ffffff; --surface-2:#f7f8fa; --text:#16181d; --muted:#5b6270;
  --line:#e4e7ec; --line-soft:#eff1f5; --accent:#0b7a4b; --accent-dark:#065f39;
  --accent-soft:#e8f6ef; --radius:10px; --maxw:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:.01ms!important;transition-duration:.01ms!important}}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--accent-dark);text-underline-offset:2px}
a:hover{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px;top:0;background:#fff;padding:12px 18px;z-index:200;border:2px solid var(--accent)}
.skip:focus{left:8px;top:8px}

/* header */
.site-head{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:100}
.head-in{display:flex;align-items:center;gap:18px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.06rem;
  color:var(--text);text-decoration:none;letter-spacing:-.01em;flex:none}
.brand .mark{width:28px;height:28px;border-radius:7px;background:var(--accent);color:#fff;
  display:grid;place-items:center;font-size:.82rem;font-weight:800}
.nav{margin-left:auto;display:flex;gap:4px;align-items:center}
.nav a{color:var(--muted);text-decoration:none;font-size:.93rem;padding:8px 11px;border-radius:7px;white-space:nowrap}
.nav a:hover{background:var(--surface-2);color:var(--text)}
.nav a[aria-current="page"]{color:var(--accent-dark);font-weight:600}
.menu-btn{display:none;margin-left:auto;background:#fff;border:1px solid var(--line);
  border-radius:8px;padding:8px 12px;font:inherit;font-size:.9rem;cursor:pointer;color:var(--text)}
@media (max-width:860px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;flex-direction:column;
    align-items:stretch;gap:0;border-bottom:1px solid var(--line);padding:6px 14px 12px;
    box-shadow:0 12px 24px rgba(16,20,30,.07)}
  .nav.open{display:flex}
  .nav a{padding:11px 8px;font-size:1rem;border-bottom:1px solid var(--line-soft)}
  .nav a:last-child{border-bottom:0}
}

/* layout */
main{display:block;min-height:55vh}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px;align-items:start;
  padding:34px 0 56px}
.layout.full{grid-template-columns:minmax(0,1fr)}
@media (max-width:980px){.layout{grid-template-columns:minmax(0,1fr);gap:34px}}
.sidebar{position:sticky;top:84px;display:flex;flex-direction:column;gap:22px}
@media (max-width:980px){.sidebar{position:static}}

/* typography */
h1,h2,h3,h4{line-height:1.25;letter-spacing:-.018em;margin:0 0 .5em}
h1{font-size:2.18rem;font-weight:800;margin-bottom:.32em}
h2{font-size:1.42rem;font-weight:700;margin-top:2.1em;padding-top:.2em}
h3{font-size:1.12rem;font-weight:700;margin-top:1.7em}
@media (max-width:640px){body{font-size:16px}h1{font-size:1.72rem}h2{font-size:1.26rem}}
p{margin:0 0 1.05em}
.standfirst{font-size:1.1rem;color:var(--muted);margin-bottom:1.4em;line-height:1.6}
.meta-line{display:flex;flex-wrap:wrap;gap:8px 16px;font-size:.85rem;color:var(--muted);
  margin:0 0 26px;padding-bottom:16px;border-bottom:1px solid var(--line)}
article ul,article ol{margin:0 0 1.15em;padding-left:1.35em}
article li{margin-bottom:.5em}
article li::marker{color:var(--accent)}
strong{font-weight:650}
code{font-family:var(--mono);font-size:.88em;background:var(--surface-2);padding:.15em .4em;
  border-radius:5px;border:1px solid var(--line-soft)}
blockquote{margin:1.4em 0;padding:2px 0 2px 18px;border-left:3px solid var(--accent-soft);color:var(--muted)}
hr{border:0;border-top:1px solid var(--line);margin:2.4em 0}

/* breadcrumbs */
.crumbs{font-size:.84rem;color:var(--muted);margin:0 0 14px;display:flex;flex-wrap:wrap;gap:6px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--accent-dark);text-decoration:underline}
.crumbs span[aria-hidden]{opacity:.5}

/* formula / callout / example blocks */
.callout{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;margin:1.5em 0}
.callout p:last-child{margin-bottom:0}
.callout h3,.callout h4{margin-top:0;font-size:1rem}
.formula{background:var(--surface-2);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:var(--radius);padding:16px 20px;margin:1.4em 0;font-family:var(--mono);
  font-size:.94rem;line-height:1.75;overflow-x:auto;white-space:pre-wrap;word-break:break-word}
.note{border-left:3px solid var(--accent);background:var(--accent-soft);padding:14px 18px;
  border-radius:0 var(--radius) var(--radius) 0;margin:1.5em 0;font-size:.96rem}
.note p:last-child{margin-bottom:0}
.note strong:first-child{color:var(--accent-dark)}

/* tables */
.table-wrap{overflow-x:auto;margin:1.5em 0;border:1px solid var(--line);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;font-size:.94rem;background:#fff}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line-soft)}
th{background:var(--surface-2);font-weight:650;font-size:.86rem;letter-spacing:.01em;
  text-transform:uppercase;color:var(--muted);white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
td:not(:first-child),th:not(:first-child){text-align:right}
.table-wrap.text-left td,.table-wrap.text-left th{text-align:left}

/* calculator */
.calc-card{border:1px solid var(--line);border-radius:14px;background:#fff;
  box-shadow:0 1px 3px rgba(16,20,30,.05);overflow:hidden;margin:0 0 30px}
.calc-card > form{padding:22px}
.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:16px 18px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field > label{font-size:.88rem;font-weight:600;color:var(--text)}
.in{display:flex;align-items:stretch;border:1px solid var(--line);border-radius:9px;
  background:#fff;overflow:hidden}
.in:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.in input,.in select{border:0;background:transparent;padding:10px 12px;font:inherit;font-size:.98rem;
  width:100%;min-width:0;color:var(--text);appearance:none;border-radius:9px}
.in select{cursor:pointer;background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M1 1.5 6 6.5l5-5'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center;background-size:11px;padding-right:32px}
.in input:focus,.in select:focus{outline:none}
.in .unit{flex:none;display:grid;place-items:center;padding:0 12px;background:var(--surface-2);
  border-left:1px solid var(--line);font-size:.84rem;color:var(--muted);white-space:nowrap}
.help{font-size:.79rem;color:var(--muted);margin:0;line-height:1.45}
.calc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.btn{font:inherit;font-size:.95rem;font-weight:600;padding:11px 22px;border-radius:9px;border:1px solid transparent;
  cursor:pointer;background:var(--accent);color:#fff;transition:background .15s}
.btn:hover{background:var(--accent-dark)}
.btn.ghost{background:#fff;color:var(--muted);border-color:var(--line)}
.btn.ghost:hover{background:var(--surface-2);color:var(--text)}
.result{border-top:1px solid var(--line);background:var(--surface-2);padding:22px}
.result[hidden]{display:none}
.result .primary{display:flex;flex-direction:column;gap:2px;margin-bottom:4px}
.result .primary .lbl{font-size:.83rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-weight:600}
.result .primary .val{font-size:2.15rem;font-weight:800;letter-spacing:-.025em;color:var(--accent-dark);
  line-height:1.15;word-break:break-word}
.result .primary .note{font-size:.93rem;color:var(--muted)}
.result .rows{list-style:none;margin:16px 0 0;padding:14px 0 0;border-top:1px solid var(--line)}
.result .rows li{display:flex;justify-content:space-between;gap:16px;padding:6px 0;font-size:.95rem;margin:0}
.result .rows li span:first-child{color:var(--muted)}
.result .rows li span:last-child{font-weight:650;text-align:right;font-variant-numeric:tabular-nums}
.result .err{color:#b42318;font-weight:600;font-size:.96rem;margin:0}
.result .rows li.sub span:first-child{padding-left:14px;font-size:.9rem;opacity:.85}

/* cards / listings */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(272px,1fr));gap:16px;margin:1.6em 0}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;background:#fff;
  text-decoration:none;color:inherit;display:flex;flex-direction:column;transition:border-color .15s,box-shadow .15s}
.card:hover{border-color:var(--accent);box-shadow:0 4px 14px rgba(16,20,30,.07)}
.card h3{margin:0 0 6px;font-size:1.01rem;color:var(--text);font-weight:680}
.card p{margin:0;font-size:.89rem;color:var(--muted);line-height:1.55}
.card .tag{font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--accent-dark);
  font-weight:700;margin-bottom:8px}
.linklist{list-style:none;padding:0;margin:1.2em 0;display:grid;
  grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:2px 24px}
.linklist li{margin:0;border-bottom:1px solid var(--line-soft)}
.linklist a{display:block;padding:9px 2px;text-decoration:none;color:var(--text);font-size:.94rem}
.linklist a:hover{color:var(--accent-dark)}

/* hero */
.hero{padding:52px 0 8px;border-bottom:1px solid var(--line)}
.hero h1{font-size:2.5rem;max-width:20ch}
.hero p{font-size:1.14rem;color:var(--muted);max-width:62ch;margin-bottom:1.5em}
@media (max-width:640px){.hero{padding:34px 0 6px}.hero h1{font-size:1.85rem}.hero p{font-size:1.02rem}}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;padding-bottom:36px}
.btn-lg{padding:13px 26px;font-size:1rem;text-decoration:none;display:inline-block}
.section-head{margin:46px 0 4px}
.section-head h2{margin-top:0}
.section-head p{color:var(--muted);margin-bottom:0}

/* sidebar widgets */
.widget{border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;background:#fff}
.widget h2,.widget h3{margin:0 0 12px;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;
  color:var(--muted);font-weight:700}
.widget ul{list-style:none;margin:0;padding:0}
.widget li{margin:0 0 1px}
.widget a{display:block;padding:6px 0;font-size:.92rem;text-decoration:none;color:var(--text);
  border-bottom:1px solid var(--line-soft)}
.widget li:last-child a{border-bottom:0}
.widget a:hover{color:var(--accent-dark)}

/* FAQ */
.faq{margin:2.2em 0 0}
.faq details{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:10px;background:#fff}
.faq summary{padding:14px 18px;font-weight:650;cursor:pointer;list-style:none;font-size:.99rem;
  display:flex;justify-content:space-between;gap:14px;align-items:flex-start}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent);font-weight:700;font-size:1.2rem;line-height:1;flex:none}
.faq details[open] summary::after{content:"\2212"}
.faq .ans{padding:0 18px 16px;color:var(--muted);font-size:.96rem}
.faq .ans p:last-child{margin-bottom:0}

/* toc */
.toc{border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;margin:0 0 30px;background:var(--surface-2)}
.toc h2{margin:0 0 10px;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.toc ol{margin:0;padding-left:1.15em;font-size:.93rem}
.toc li{margin-bottom:5px}
.toc a{text-decoration:none;color:var(--text)}
.toc a:hover{color:var(--accent-dark);text-decoration:underline}

/* search */
.search{position:relative;margin:0 0 6px}
.search input{width:100%;padding:11px 14px;font:inherit;font-size:.96rem;border:1px solid var(--line);
  border-radius:9px;background:#fff;color:var(--text)}
.search input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.search-out{list-style:none;margin:8px 0 0;padding:0}
.search-out li{border-bottom:1px solid var(--line-soft)}
.search-out a{display:block;padding:8px 2px;text-decoration:none;font-size:.93rem;color:var(--text)}
.search-out a:hover{color:var(--accent-dark)}
.search-out .none{padding:8px 2px;color:var(--muted);font-size:.9rem}

/* ads: zero reserved space until a slot is configured */
.ad{margin:26px 0;text-align:center}
.ad:empty{display:none;margin:0}
.ad-label{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:#9aa1ad;margin:0 0 4px}

/* disclaimer strip */
.disclaimer{border:1px solid var(--line);border-left:3px solid #d0a215;background:#fffdf5;
  border-radius:0 var(--radius) var(--radius) 0;padding:15px 18px;margin:2.6em 0 0;font-size:.9rem;color:#5c5326}
.disclaimer p:last-child{margin-bottom:0}
.disclaimer strong{color:#7a6a15}

/* related */
.related{margin-top:2.6em;padding-top:1.6em;border-top:1px solid var(--line)}
.related h2{margin-top:0;font-size:1.1rem}

/* footer */
.site-foot{border-top:1px solid var(--line);background:var(--surface-2);padding:44px 0 28px;margin-top:20px;font-size:.92rem}
.foot-grid{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:30px}
@media (max-width:820px){.foot-grid{grid-template-columns:1fr 1fr;gap:26px}}
@media (max-width:480px){.foot-grid{grid-template-columns:1fr}}
.foot-grid h2{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 12px;font-weight:700}
.foot-grid ul{list-style:none;margin:0;padding:0}
.foot-grid li{margin-bottom:7px}
.foot-grid a{color:var(--muted);text-decoration:none}
.foot-grid a:hover{color:var(--accent-dark);text-decoration:underline}
.foot-blurb{color:var(--muted);max-width:42ch;margin:0}
.foot-brand{font-weight:700;color:var(--text);margin:0 0 10px;font-size:1rem}
.foot-bottom{margin-top:34px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);
  font-size:.85rem;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between}
.foot-bottom p{margin:0}

/* consent banner */
#consent{position:fixed;left:0;right:0;bottom:0;z-index:300;background:#fff;
  border-top:1px solid var(--line);box-shadow:0 -6px 28px rgba(16,20,30,.10);padding:18px 0}
#consent[hidden]{display:none}
.consent-in{display:flex;gap:22px;align-items:center;flex-wrap:wrap}
.consent-in p{margin:0;font-size:.89rem;color:var(--muted);flex:1 1 380px;line-height:1.55}
.consent-btns{display:flex;gap:9px;flex-wrap:wrap;flex:none}
.consent-btns button{font:inherit;font-size:.88rem;font-weight:600;padding:9px 18px;border-radius:8px;cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--text)}
.consent-btns button.pri{background:var(--accent);color:#fff;border-color:var(--accent)}
.consent-btns button.pri:hover{background:var(--accent-dark)}
.consent-btns button:not(.pri):hover{background:var(--surface-2)}

/* forms (contact) */
.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:16px;max-width:560px}
.form-row label{font-size:.88rem;font-weight:600}
.form-row input,.form-row textarea,.form-row select{font:inherit;font-size:.97rem;padding:10px 12px;
  border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--text);width:100%}
.form-row textarea{min-height:150px;resize:vertical}
.form-row input:focus,.form-row textarea:focus,.form-row select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.hp{position:absolute;left:-9999px}

.pill{display:inline-block;font-size:.73rem;text-transform:uppercase;letter-spacing:.05em;font-weight:700;
  color:var(--accent-dark);background:var(--accent-soft);padding:3px 9px;border-radius:20px;margin-bottom:12px}
.count{font-variant-numeric:tabular-nums}