@charset "UTF-8";
:root{--ink:#142d39;--muted:#586b73;--teal:#00766c;--mint:#b5f3d2;--paper:#f6f8f6;--line:#dbe4df;--white:#fff;--radius:18px;--shadow:0 12px 35px #142d3908}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;font-size:16px;line-height:1.65}a{color:var(--teal);text-underline-offset:4px}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible{outline:3px solid #dd8700;outline-offset:4px}input:focus,select:focus,textarea:focus{outline:3px solid #97dbc5;outline-offset:1px;border-color:var(--teal)}[hidden]{display:none!important}.wrap{max-width:1180px;margin:auto;padding:0 28px}.skip{position:fixed;z-index:20;top:-100px;left:16px;background:white;padding:12px}.skip:focus{top:12px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.header-inner{min-height:88px;display:flex;align-items:center;justify-content:space-between;gap:25px}.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink);font-size:23px;font-weight:800;letter-spacing:-1px}.brand-mark{width:38px;height:38px;background:var(--ink);color:var(--mint);display:grid;place-items:center;border-radius:10px;font-size:30px;font-weight:600}.brand small{font-size:12px;letter-spacing:0;border:1px solid var(--line);padding:2px 6px;margin-left:3px;color:var(--muted);font-weight:600}.main-nav{display:flex;gap:28px;align-items:center;flex-wrap:wrap}.main-nav a{font-size:14px;text-decoration:none;font-weight:650;color:var(--ink)}.main-nav a:hover{color:var(--teal)}.main-nav .nav-cta{border:1px solid var(--line);padding:9px 16px;border-radius:9px}
.hero{padding:56px 0 30px;display:grid;grid-template-columns:1.6fr 1fr;gap:54px;align-items:center}.eyebrow{font-size:12px;font-weight:750;letter-spacing:1.7px;text-transform:uppercase;color:var(--teal);margin:0 0 14px;display:flex;gap:9px;align-items:center}.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--teal)}h1,h2,h3{line-height:1.15;letter-spacing:-.035em}h1{font-size:clamp(36px,4.4vw,58px);margin:0 0 20px;font-weight:780}h1 em{color:var(--teal);font-style:normal}.hero p.lead{max-width:545px;font-size:18px;color:var(--muted);line-height:1.65;margin:0}.hero-note{border-radius:22px;background:var(--ink);padding:28px;color:white;position:relative;overflow:hidden;transform:rotate(1deg)}.hero-note:before{content:"";position:absolute;width:160px;height:160px;border:1px solid #ffffff16;border-radius:50%;right:-45px;top:-55px;box-shadow:0 0 0 25px #ffffff06,0 0 0 50px #ffffff04}.hero-note p{margin:0}.hero-note .tiny{color:#bccec9;letter-spacing:1.5px;font-size:12px;font-weight:650;text-transform:uppercase}.equation{font-size:32px;letter-spacing:-1px;font-weight:650;margin:17px 0!important}.equation strong{color:var(--mint);font-size:54px}.hero-note a{display:flex;justify-content:space-between;border-top:1px solid #ffffff26;padding-top:15px;color:var(--mint);text-decoration:none;font-size:14px}.search-shell{margin:12px 0 22px;max-width:100%;background:white;border:1px solid #c7d8d0;border-radius:13px;display:flex;align-items:center;padding:5px 12px 5px 20px;box-shadow:var(--shadow)}.search-shell span{font-size:25px;color:var(--teal);padding-right:12px}.search-shell input{border:0;background:transparent;flex:1;min-width:0;padding:13px 2px;font-size:17px;color:var(--ink)}.search-shell input:focus{outline:0}.search-shell:focus-within{outline:3px solid #97dbc5}.search-shell button{border:0;border-radius:7px;background:#edf3ef;color:var(--muted);padding:7px 12px}.filters{display:flex;gap:8px;flex-wrap:wrap;padding-bottom:30px;border-bottom:1px solid var(--line)}.filter{border:1px solid var(--line);border-radius:30px;background:transparent;padding:8px 15px;font-size:14px;color:var(--muted);font-weight:550}.filter[aria-pressed=true]{background:var(--ink);color:white;border-color:var(--ink)}.filter:hover{border-color:var(--teal)}.section{padding:36px 0}.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:20px}.section-head h2{font-size:25px;margin:0}.section-head p{margin:0;color:var(--muted);font-size:14px}.section-head a{font-size:14px;font-weight:650}.popular-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.popular-card{display:flex;align-items:center;gap:15px;background:#fff;border:1px solid var(--line);padding:18px;border-radius:12px;text-decoration:none;color:var(--ink);transition:transform .16s,border-color .16s}.popular-card:hover,.tool-card:hover{transform:translateY(-3px);border-color:#63a997}.tool-icon{display:grid;place-items:center;background:#edf5ef;color:var(--teal);width:45px;height:45px;border-radius:10px;font-size:19px;font-weight:700;flex-shrink:0;letter-spacing:-1px}.popular-card strong{font-size:16px;display:block}.popular-card small{display:block;color:var(--muted);font-size:12px}.arrow{margin-left:auto;color:var(--teal)}.directory{padding-top:16px}.category-section{padding:20px 0 30px}.category-title{display:flex;gap:12px;align-items:center;margin-bottom:18px}.category-title h3{font-size:21px;margin:0}.category-title span{font-size:12px;background:#e6ede8;color:var(--muted);padding:1px 8px;border-radius:15px}.category-title:after{content:"";height:1px;flex:1;background:var(--line);margin-left:10px}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.tool-card{display:flex;flex-direction:column;text-decoration:none;background:white;border:1px solid var(--line);border-radius:var(--radius);padding:24px;color:var(--ink);transition:transform .16s,border-color .16s}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.tool-card h4{font-size:18px;letter-spacing:-.4px;line-height:1.3;margin:0 0 9px}.tool-card p{font-size:14px;color:var(--muted);line-height:1.6;margin:0}.empty{background:white;padding:32px;border:1px solid var(--line);border-radius:var(--radius)}.trust-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding:30px 0 48px}.trust-strip div{border-top:2px solid var(--line);padding-top:17px}.trust-strip strong{display:block;font-size:15px}.trust-strip p{font-size:14px;color:var(--muted);margin:7px 0 0}.site-footer{background:var(--ink);color:#c5d3d3;padding:42px 0 25px}.footer-top{display:flex;justify-content:space-between;gap:40px;padding-bottom:26px}.site-footer .brand{color:white}.site-footer .brand-mark{background:#264752}.site-footer p{font-size:14px;max-width:380px;margin:14px 0}.footer-links{display:flex;gap:16px 24px;flex-wrap:wrap;max-width:460px;align-content:flex-start;padding-top:8px}.footer-links a{color:#d3e0dd;font-size:14px;text-decoration:none}.footer-bottom{display:flex;justify-content:space-between;gap:16px;border-top:1px solid #ffffff20;padding-top:20px;font-size:12px}.footer-bottom a{color:var(--mint)}
.breadcrumbs{font-size:13px;color:var(--muted);display:flex;gap:9px;flex-wrap:wrap;padding-top:26px;margin-bottom:27px}.breadcrumbs a{text-decoration:none}.page-intro{max-width:780px;margin-bottom:30px}.page-intro h1{font-size:clamp(32px,4vw,44px);margin-bottom:14px}.page-intro .lead{font-size:18px;color:var(--muted);margin:0}.calc-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:24px;align-items:start}.input-panel{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:30px;box-shadow:var(--shadow)}.panel-heading{margin:0 0 6px;font-size:20px}.field-note{font-size:13px;color:var(--muted);margin:0 0 25px}.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.field{min-width:0}.field.wide{grid-column:1/-1}.field label{display:block;font-size:14px;font-weight:650;line-height:1.4;margin-bottom:8px}.field input,.field select,.contact-form input,.contact-form textarea{width:100%;border:1px solid #b9cbc2;border-radius:8px;background:#fff;padding:12px;color:var(--ink);min-height:48px}.field input:disabled{opacity:.45}.form-actions{display:flex;gap:12px;margin-top:26px;align-items:center}.button{border:0;border-radius:9px;background:var(--teal);color:#fff;padding:12px 22px;font-weight:650;text-decoration:none;display:inline-block;line-height:1.5}.button:hover{background:#005e56}.button.secondary{border:1px solid var(--line);color:var(--ink);background:#fff}.error{background:#fff0eb;color:#972d14;border-left:3px solid #b94421;padding:12px 15px;font-size:14px;margin:20px 0 0}.result-panel{background:var(--ink);color:#fff;border-radius:var(--radius);padding:30px;position:sticky;top:24px}.result-panel h2{font-size:13px;text-transform:uppercase;letter-spacing:1.5px;color:#bad0cc;margin:0 0 22px}.primary-result .result-label{font-size:14px;color:#c4d5d0}.primary-result .result-value{font-size:clamp(29px,3.5vw,46px);line-height:1.2;letter-spacing:-1.2px;color:var(--mint);font-weight:700;overflow-wrap:anywhere;margin:10px 0 22px}.result-unit{font-size:17px;font-weight:450;letter-spacing:0;margin-left:7px}.result-row{display:flex;justify-content:space-between;gap:20px;padding:12px 0;border-top:1px solid #ffffff20;font-size:14px}.result-row span{color:#c4d5d0}.result-row strong{font-weight:600;text-align:right;overflow-wrap:anywhere}.result-note{font-size:13px;line-height:1.6;color:#c4d5d0;margin:17px 0 0}.result-empty{font-size:19px;color:#d4e6df}.local-note{font-size:12px;color:#bad0cc;border-top:1px solid #ffffff20;margin:22px 0 0;padding-top:15px}.content-layout{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:44px;padding:44px 0}.article h2,.info-page h2{font-size:24px;margin:0 0 16px}.article p{color:var(--muted);margin:0 0 18px}.formula{padding:20px;background:#e8f1eb;border-left:3px solid var(--teal);border-radius:0 10px 10px 0;line-height:1.8;color:var(--ink)!important;font-family:ui-monospace,Consolas,monospace;font-size:14px;overflow-wrap:anywhere}.example{padding:23px;background:white;border:1px solid var(--line);border-radius:14px;margin:26px 0}.example h3{font-size:18px;margin:0 0 12px}.example p{margin:0}.faq h2{font-size:23px;margin:0 0 18px}.faq details{border-bottom:1px solid var(--line);padding:17px 0}.faq summary{font-weight:650;font-size:15px;cursor:pointer}.faq details p{font-size:14px;color:var(--muted);margin:12px 0 2px}.related{padding:4px 0 50px}.related h2{font-size:25px}.info-page{max-width:800px;padding:42px 0 70px}.info-page h1{font-size:42px}.info-page p,.info-page li{color:var(--muted)}.info-page section{margin-top:30px}.info-page .updated{font-size:13px}.contact-form{background:white;border:1px solid var(--line);padding:26px;border-radius:15px;margin-top:25px}.contact-form label{display:block;font-size:14px;font-weight:650;margin:15px 0 7px}.contact-form textarea{min-height:150px;resize:vertical}.contact-form .button{margin-top:18px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.no-script{padding:18px;background:#fff0da;border:1px solid #ddc59b;border-radius:10px;margin:20px 0}.source{font-size:13px}.back-top{font-size:14px}
@media(min-width:1400px){.hero{padding-top:65px}.tool-card{min-height:210px}}
@media(max-width:900px){.hero{gap:25px;grid-template-columns:1.5fr 1fr}.hero-note{padding:20px}.equation{font-size:25px}.equation strong{font-size:40px}.tool-grid{grid-template-columns:repeat(2,1fr)}.popular-grid{grid-template-columns:repeat(2,1fr)}.calc-layout{grid-template-columns:1fr 1fr}.fields{grid-template-columns:1fr}.field{grid-column:1/-1}.input-panel,.result-panel{padding:23px}.content-layout{gap:28px}.main-nav{gap:16px}}
@media(max-width:640px){.wrap{padding:0 20px}.header-inner{padding-top:16px;padding-bottom:16px;min-height:0;flex-wrap:wrap;gap:15px}.brand{font-size:21px}.main-nav{width:100%;justify-content:space-between;gap:10px}.main-nav .nav-cta{padding:0;border:0}.main-nav a{font-size:13px}.hero{display:block;padding:34px 0 15px}.hero-note{display:none}.hero h1{font-size:39px}.hero p.lead{font-size:16px}.search-shell{margin-top:8px;padding-left:13px}.search-shell input{font-size:16px}.search-shell button{font-size:13px;padding:6px 9px}.filters{gap:7px;padding-bottom:24px}.filter{font-size:12px;padding:7px 11px}.section{padding:28px 0}.section-head h2{font-size:22px}.section-head{align-items:flex-start;flex-wrap:wrap}.popular-grid{gap:10px}.popular-card{padding:13px;gap:9px}.popular-card .tool-icon{width:32px;height:32px;font-size:14px;border-radius:7px}.popular-card strong{font-size:14px}.popular-card small{font-size:11px}.popular-card .arrow{display:none}.tool-grid{grid-template-columns:1fr}.tool-card{padding:21px}.card-top{margin-bottom:13px}.tool-card h4{font-size:18px}.trust-strip{grid-template-columns:1fr;gap:18px;padding-bottom:32px}.footer-top{flex-direction:column;gap:14px}.footer-bottom{flex-direction:column;font-size:12px}.calc-layout,.content-layout{grid-template-columns:1fr}.result-panel{position:static}.page-intro{margin-bottom:23px}.page-intro .lead{font-size:16px}.fields{gap:18px}.input-panel{padding:23px}.form-actions{flex-wrap:wrap}.content-layout{padding-top:34px;gap:20px}.primary-result .result-value{font-size:37px}.info-page{padding-top:30px}.info-page h1{font-size:34px}.contact-form{padding:20px}.breadcrumbs{font-size:12px;margin-bottom:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;transform:none!important}}
@media print{.site-header,.site-footer,.filters,.search-shell,.form-actions,.related,.contact-form{display:none}.wrap{max-width:none;padding:0}.result-panel{background:white;color:#142d39;border:1px solid #ccc;position:static}.result-panel *{color:#142d39!important}.calc-layout,.content-layout{display:block}.result-panel,.input-panel{margin-bottom:20px}.field input,.field select{border:0}.hero-note{display:none}body{background:white}}

@media(max-width:360px){.popular-grid{grid-template-columns:1fr}.popular-card .arrow{display:block}.hero h1{font-size:34px}}