:root{--green:#16a34a;--darkgreen:#15803d;--tint:#f0fdf4;--bg:#f8fafc;--surface:#fff;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;color-scheme:light}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:16px/1.6 system-ui,-apple-system,Segoe UI,Arial,sans-serif}a{color:inherit;text-decoration:none}a:hover{color:var(--darkgreen)}button,input,textarea{font:inherit}button,a,input,textarea{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #86efac;outline-offset:4px}.wrap{width:min(1120px,100%);padding:0 20px;margin:auto}.top{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.head{height:74px;display:flex;align-items:center;gap:32px}.logo{display:flex;align-items:center;gap:9px;font-size:26px;font-weight:800;letter-spacing:-1px;white-space:nowrap}.logo svg{color:var(--green)}.nav{margin-left:auto;display:flex;align-items:center;gap:24px;font-size:14px;font-weight:600}.theme{border:1px solid var(--line);background:var(--surface);color:var(--ink);width:36px;height:36px;border-radius:9px}.search{position:relative}.head .search{margin-left:auto;width:340px}.search input{width:100%;border:1px solid var(--line);border-radius:9px;background:var(--bg);padding:10px 38px;color:var(--ink);font-size:14px;outline:none}.search input:focus{border-color:var(--green);box-shadow:0 0 0 3px #16a34a15}.search:before{content:'⌕';position:absolute;left:13px;top:5px;font-size:24px;color:var(--muted)}.search kbd{position:absolute;right:12px;top:11px;color:var(--muted);font:12px system-ui;border:1px solid var(--line);border-radius:4px;padding:0 5px}.categorybar{border-bottom:1px solid var(--line);background:var(--surface)}.categorylinks{display:flex;gap:23px;overflow:auto;white-space:nowrap;font-size:13px;padding-top:11px;padding-bottom:11px;scrollbar-width:none}.categorylinks a.active{color:var(--darkgreen);font-weight:700}.hero{text-align:center;padding:44px 0 32px}.eyebrow{display:inline-flex;align-items:center;gap:7px;padding:4px 10px;border:1px solid #bbf7d0;border-radius:100px;background:var(--tint);color:var(--darkgreen);font-size:12px;font-weight:600}.hero h1{font-size:40px;line-height:1.2;letter-spacing:-1.6px;margin:17px 0 14px}.hero h1 span{color:var(--darkgreen)}.hero p{color:var(--muted);max-width:650px;margin:0 auto 20px;font-size:16px}.hero .search{max-width:610px;margin:22px auto 16px}.hero .search input{background:var(--surface);padding-top:16px;padding-bottom:16px;font-size:16px;box-shadow:0 3px 9px #0f172a05}.hero .search:before{top:10px}.hero .search kbd{top:18px}.proof{display:flex;justify-content:center;gap:24px;font-size:12px;color:var(--muted)}.proof span:before{content:'✓';color:var(--green);margin-right:6px}.section{margin:22px 0 36px}.section-head{display:flex;align-items:center;gap:13px;margin-bottom:17px}.icon{flex-shrink:0;width:43px;height:43px;display:grid;place-items:center;font:24px Georgia,serif;border-radius:11px;background:var(--tint);color:var(--darkgreen)}h2{font-size:22px;letter-spacing:-.4px;line-height:1.35;margin:0}h3{font-size:16px;line-height:1.4;margin:0}.section-head p{font-size:13px;color:var(--muted);margin:2px 0 0}.section-head .view{margin-left:auto;font-size:13px;font-weight:600;color:var(--darkgreen);white-space:nowrap}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.calc-card{display:flex;align-items:flex-start;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:17px;min-height:126px;transition:transform .15s,border-color .15s,box-shadow .15s}.calc-card:hover{transform:translateY(-2px);border-color:#86efac;box-shadow:0 6px 16px #0f172a07;color:var(--ink)}.calc-card .icon{width:35px;height:35px;font-size:21px;border-radius:9px}.calc-card p{font-size:13px;line-height:1.55;color:var(--muted);margin:6px 0 0}.smalltag{font-size:10px;font-weight:600;color:var(--darkgreen);background:var(--tint);border-radius:4px;padding:2px 5px;margin-left:5px;vertical-align:middle}.popular{padding-top:7px}.popular .section-head{margin-bottom:14px}.popular .grid{grid-template-columns:repeat(4,minmax(0,1fr))}.popular .calc-card{display:block;min-height:166px}.popular .icon{margin-bottom:12px}.divider{border:0;border-top:1px solid var(--line);margin:35px 0}.category-directory{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin:20px 0 36px}.category-tile{border:1px solid var(--line);border-radius:9px;background:var(--surface);padding:13px 4px;text-align:center;font-size:12px;font-weight:600}.category-tile b{font:23px Georgia;color:var(--darkgreen);display:block;margin-bottom:6px}.category-tile:hover{border-color:var(--green)}.breadcrumb{display:flex;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--muted);margin:24px 0 17px}.page-title{font-size:32px;letter-spacing:-1px;line-height:1.2;margin:0 0 22px}.page-lead{color:var(--muted);margin:-8px 0 24px}.panel{padding:22px;background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:0 1px 3px #0f172a04}.calculator{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}.field{margin-bottom:20px}.field label{font-size:14px;font-weight:600;display:block;margin-bottom:7px}.control{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}.control:focus-within{border-color:var(--green);box-shadow:0 0 0 3px #16a34a15}.control input,.control textarea{background:var(--surface);color:var(--ink);border:0;outline:0;padding:12px;width:100%;min-width:0;font-size:16px}.control textarea{min-height:125px;resize:vertical}.unit{border-left:1px solid var(--line);padding:0 12px;display:grid;place-items:center;font-size:12px;white-space:nowrap;color:var(--muted);background:var(--bg)}.field small{font-size:12px;color:var(--muted);display:block;margin-top:5px}.result-heading{font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin:0 0 15px}.primary{background:linear-gradient(120deg,#16a34a,#15803d);color:white;border-radius:11px;padding:18px 20px;margin-bottom:10px}.primary span{font-size:13px}.primary strong{display:block;font-size:32px;line-height:1.35;letter-spacing:-.5px;overflow-wrap:anywhere}.primary small{font-size:12px;opacity:.85}.result-row{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding:14px 0;font-size:14px}.result-row:last-child{border:0}.result-row strong{text-align:right}.reset-row{border-top:1px solid var(--line);padding-top:15px;display:flex;justify-content:flex-end}.btn{background:var(--surface);border:1px solid var(--line);color:var(--ink);border-radius:7px;padding:7px 13px;font-size:13px}.btn:hover{background:var(--tint)}.error{color:#dc2626;font-size:13px}.error:empty{display:none}.intro{margin:25px 0;color:var(--muted)}.intro p{margin:10px 0}.content-panel{margin:20px 0}.content-panel h2{margin-bottom:15px}.content-panel p,.content-panel li{font-size:15px;line-height:1.8}.formula{border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:17px;font:15px/1.6 ui-monospace,SFMono-Regular,monospace;overflow-wrap:anywhere}.content-panel ul{padding-left:20px}.example{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:16px}.example ul{margin:6px 0}.faq details{padding:15px 0;border-bottom:1px solid var(--line)}.faq details:last-child{border:0}.faq summary{font-weight:600;font-size:15px;cursor:pointer}.faq p{color:var(--muted)}.notice{font-size:12px;color:var(--muted)}.text-page{max-width:820px;margin:35px auto 60px}.text-page h1{font-size:32px}.text-page h2{margin-top:25px}.empty{text-align:center;padding:45px 20px;border:1px dashed var(--line);border-radius:12px;color:var(--muted)}.count{font-size:13px;color:var(--muted);margin:14px 0}.aboutblock{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:26px;margin:40px 0}.aboutblock p{color:var(--muted);font-size:14px;line-height:1.8}footer{background:var(--surface);border-top:1px solid var(--line);margin-top:44px;padding:35px 0 20px}.footergrid{display:grid;grid-template-columns:2fr 2fr 1fr;gap:48px}.footergrid .logo{font-size:24px}.footergrid p{font-size:13px;color:var(--muted)}.footergrid h3{font-size:14px;margin-bottom:14px}.footerlinks{display:grid;grid-template-columns:1fr 1fr;gap:7px 15px;font-size:13px}.footerlinks.single{grid-template-columns:1fr}.copyright{border-top:1px solid var(--line);margin-top:25px;padding-top:17px;color:var(--muted);font-size:12px}.hidden{display:none!important}.skip{position:absolute;top:-80px;left:10px;z-index:100;background:var(--surface);padding:10px}.skip:focus{top:10px}[data-theme=dark]{--bg:#0e1625;--surface:#162133;--ink:#e2e8f0;--muted:#a1b0c4;--line:#2d3b50;--darkgreen:#4ade80;--tint:#153927;color-scheme:dark}@media(max-width:960px){.head{gap:20px}.nav{gap:15px}.head .search{width:250px}.popular .grid{grid-template-columns:repeat(2,minmax(0,1fr))}.category-directory{grid-template-columns:repeat(7,1fr)}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:640px){.wrap{padding:0 16px}.head{height:65px;gap:10px}.logo{font-size:23px}.head .search{display:none}.nav{margin-left:auto;gap:14px}.nav .desktop{display:none}.categorylinks{gap:20px}.hero{padding:31px 0 22px}.hero h1{font-size:32px;letter-spacing:-1px}.hero p{font-size:14px}.proof{gap:8px;flex-wrap:wrap}.proof span{font-size:11px}.category-directory{grid-template-columns:repeat(4,1fr);gap:7px}.category-tile{font-size:11px}.category-tile b{font-size:22px}.grid{grid-template-columns:1fr}.popular .calc-card{padding:15px;min-height:180px}.popular h3{font-size:14px}.popular p{font-size:12px}.section-head{gap:10px}.section-head h2{font-size:19px}.section-head p{font-size:12px}.section-head .view{font-size:12px}.calculator{grid-template-columns:1fr}.page-title{font-size:27px}.panel{padding:18px}.footergrid{grid-template-columns:1fr 1fr;gap:25px}.footergrid>div:first-child{grid-column:1/-1}.footerlinks{grid-template-columns:1fr}.page-lead{font-size:14px}}@media print{header,.categorybar,footer,.reset-row{display:none}.calculator{grid-template-columns:1fr 1fr}.primary{color:black;background:white;border:1px solid #bbb}body{background:white;color:black}.panel{break-inside:avoid}}
