:root{--ink:#202521;--muted:#5e6860;--paper:#f7f4ec;--panel:#fffdf7;--line:#d8d2c3;--orange:#e65f2b;--orange-dark:#b94319;--green:#235b48;--green-soft:#dcebe1;--yellow:#f4c95d;--shadow:0 12px 30px rgba(42,45,38,.09);--radius:10px;--mono:"IBM Plex Mono","Courier New",monospace;--sans:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.6}a{color:var(--green);text-decoration-thickness:1.5px;text-underline-offset:3px}a:hover{color:var(--orange-dark)}img,svg{max-width:100%}button,input,select{font:inherit}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;background:#fff;padding:10px;z-index:99}.site-header{border-bottom:1px solid var(--line);background:rgba(247,244,236,.96);position:sticky;top:0;z-index:20}.nav-shell{max-width:1180px;margin:auto;min-height:70px;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;gap:11px;min-width:max-content;color:var(--ink);font-weight:850;text-decoration:none;letter-spacing:-.03em}.brand-mark{width:34px;height:34px;border:3px solid var(--ink);display:grid;place-items:center;background:var(--yellow);box-shadow:4px 4px 0 var(--orange);font-family:var(--mono);font-size:15px}.nav-links{display:flex;align-items:center;gap:24px}.nav-links a{text-decoration:none;font-weight:680;color:var(--ink)}.nav-links a[aria-current="page"]{color:var(--orange-dark)}.nav-toggle{display:none;background:none;border:1px solid var(--line);padding:8px 10px}.container{width:min(1180px,calc(100% - 48px));margin-inline:auto}.hero{padding:78px 0 58px;border-bottom:1px solid var(--line);background:linear-gradient(115deg,rgba(244,201,93,.18),transparent 48%),repeating-linear-gradient(0deg,transparent 0 39px,rgba(35,91,72,.045) 40px)}.eyebrow{font:700 .78rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--orange-dark)}h1,h2,h3{line-height:1.13;letter-spacing:-.035em;margin-top:0}h1{font-size:clamp(2.45rem,6vw,5.3rem);max-width:900px;margin-bottom:22px}h2{font-size:clamp(1.75rem,3.2vw,2.7rem)}h3{font-size:1.22rem}.lede{font-size:clamp(1.05rem,2vw,1.3rem);max-width:720px;color:var(--muted)}.hero-actions,.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.button{display:inline-flex;align-items:center;justify-content:center;border:2px solid var(--ink);background:var(--orange);color:#fff;padding:11px 18px;font-weight:780;text-decoration:none;box-shadow:4px 4px 0 var(--ink);cursor:pointer}.button:hover{background:var(--orange-dark);color:#fff}.button.secondary{background:var(--panel);color:var(--ink)}.workbench-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:50px}.workbench-strip div{background:var(--panel);padding:20px}.workbench-strip strong{font:750 .85rem var(--mono);display:block}.section{padding:64px 0}.section.alt{background:#eeeadf;border-block:1px solid var(--line)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:30px}.section-head p{max-width:620px;color:var(--muted);margin:0}.tool-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.tool-card{border:1px solid var(--line);background:var(--panel);padding:26px;position:relative;box-shadow:5px 5px 0 rgba(32,37,33,.1)}.tool-card:before{content:attr(data-no);position:absolute;right:18px;top:16px;font:700 .75rem var(--mono);color:#8c8c80}.tool-card p{color:var(--muted)}.tool-card a{font-weight:800}.tag{font:700 .72rem var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--orange-dark)}.category-list{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line)}.category-list a{padding:22px 15px;background:var(--panel);border-right:1px solid var(--line);text-decoration:none;font-weight:760;text-align:center}.category-list a:last-child{border:0}.page-hero{padding:48px 0 34px;border-bottom:1px solid var(--line)}.page-hero h1{font-size:clamp(2.2rem,5vw,4rem);margin-bottom:16px}.breadcrumbs{font:650 .8rem var(--mono);margin-bottom:22px;color:var(--muted)}.breadcrumbs a{color:inherit}.calculator-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(290px,.65fr);gap:28px;align-items:start}.calc-panel,.result-panel{border:1px solid var(--line);background:var(--panel);padding:28px;box-shadow:var(--shadow)}.calc-panel h2,.result-panel h2{font-size:1.35rem}.field-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:1/-1}.field label{font-weight:740}.field small{color:var(--muted);line-height:1.35}.field input,.field select{width:100%;min-height:46px;border:1px solid #99998f;background:#fff;padding:9px 11px;border-radius:2px}.field input:focus,.field select:focus{outline:3px solid rgba(230,95,43,.23);border-color:var(--orange)}.result-panel{position:sticky;top:94px;border-top:6px solid var(--green)}.result-value{font:750 clamp(1.9rem,4vw,3rem) var(--mono);color:var(--green);overflow-wrap:anywhere;margin:8px 0}.result-detail{padding:14px 0;border-top:1px dashed var(--line);margin-top:15px}.result-detail p{margin:6px 0}.error{color:#a02016;font-weight:700;min-height:1.5em}.formula,.note{background:var(--green-soft);border-left:4px solid var(--green);padding:16px 18px;margin:22px 0}.content{max-width:780px}.content h2{margin-top:42px}.content li+li{margin-top:8px}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.related a{border:1px solid var(--line);padding:16px;background:var(--panel);font-weight:720}.site-footer{border-top:1px solid var(--line);padding:40px 0 24px;background:#292f2a;color:#eef0e9}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}.site-footer a{color:#eef0e9}.site-footer ul{list-style:none;padding:0;margin:8px 0}.site-footer li{margin:6px 0}.fine-print{border-top:1px solid #4e554f;margin-top:28px;padding-top:20px;color:#bfc7bf;font-size:.85rem}.utility-bar{font:650 .76rem var(--mono);padding:7px 0;background:#292f2a;color:#d8ddd6;text-align:center}.tool-index{display:grid;grid-template-columns:220px 1fr;gap:34px}.tool-nav{position:sticky;top:96px;align-self:start}.tool-nav a{display:block;padding:8px 0;border-bottom:1px solid var(--line)}.tool-group{margin-bottom:40px}.tool-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.tool-list a{background:var(--panel);border:1px solid var(--line);padding:18px;text-decoration:none}.kicker{font:700 .8rem var(--mono);color:var(--orange-dark)}
.nav-toggle{min-height:44px;padding-inline:12px}.button{min-height:48px}.calculator-layout{gap:32px}.calc-panel{border-top:6px solid var(--yellow)}.calc-panel h2,.result-panel h2{font:750 .84rem var(--mono);letter-spacing:.1em;text-transform:uppercase}.field input,.field select{min-height:48px}.result-panel{background:#f6fbf7}.result-panel .eyebrow{margin-bottom:2px}.tool-list a{border-left:4px solid var(--green)}.tool-list a:hover{border-left-color:var(--orange);background:#fffaf0}
@media(max-width:800px){.nav-toggle{display:block}.nav-links{display:none;position:absolute;top:70px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);padding:18px 24px;flex-direction:column;align-items:flex-start}.nav-links.open{display:flex}.workbench-strip,.footer-grid{grid-template-columns:1fr}.calculator-layout,.tool-index{grid-template-columns:1fr}.result-panel,.tool-nav{position:static}.category-list{grid-template-columns:1fr 1fr}.category-list a{border-bottom:1px solid var(--line)}.tool-grid,.related{grid-template-columns:1fr}.hero{padding-top:54px}}
@media(max-width:520px){.container{width:min(100% - 28px,1180px)}.nav-shell{padding:0 14px}.brand{font-size:.98rem}.brand-mark{width:31px;height:31px}.field-grid,.tool-list{grid-template-columns:1fr}.field.full{grid-column:auto}.calc-panel,.result-panel{padding:20px}.category-list{grid-template-columns:1fr}.section{padding:48px 0}.page-hero{padding-top:34px}h1{font-size:2.5rem}.workbench-strip{margin-top:34px}}
@media print{.site-header,.utility-bar,.site-footer,.breadcrumbs,.button-row{display:none}.result-panel{position:static}.calculator-layout{display:block}.calc-panel{margin-bottom:20px}body{background:#fff}}