:root{--navy:#122236;--ink:#192b40;--muted:#536375;--orange:#ffad45;--line:#dce2e9;--paper:#f3f6f9}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:white;color:var(--ink);font-family:Inter,Arial,sans-serif;font-size:16px;line-height:1.6}a{color:inherit}header{max-width:1320px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:26px 48px;border-bottom:1px solid var(--line);gap:25px}.brand{text-decoration:none;display:flex;gap:12px;align-items:center;font-size:12px;letter-spacing:2px;line-height:1.35}.brand b{font-size:19px;letter-spacing:3px}.mark{display:block;background:var(--navy);color:white;width:44px;height:44px;text-align:center;font-size:32px;line-height:44px;font-weight:800;letter-spacing:-3px}.mark span{color:var(--orange);font-size:20px}nav{display:flex;gap:32px}nav a{text-decoration:none;font-size:14px;font-weight:600}nav a:hover,nav a:focus-visible{color:#9b5600}.header-note{font-size:12px;letter-spacing:1.2px;color:var(--muted)}main{max-width:1224px;padding:0 24px;margin:auto}.intro{padding:64px 0 48px;display:flex;justify-content:space-between;align-items:center}.eyebrow{font-family:monospace;font-size:12px;letter-spacing:1.8px;font-weight:bold;margin:0 0 14px;color:#586b80}h1{font-size:clamp(40px,5vw,66px);letter-spacing:-2.5px;line-height:1.07;margin:0 0 22px;font-weight:750}h1 span{color:#607c9b}.intro-copy{max-width:530px;margin:0;font-size:18px;color:var(--muted)}.intro-aside{border-left:3px solid var(--orange);padding:8px 0 8px 26px;margin-right:35px}.bench-label{font:12px monospace;letter-spacing:1.5px}.intro-aside p{font-size:18px;font-weight:600;line-height:1.8}.tiny{color:var(--muted);font-size:14px}.section-title{display:flex;align-items:end;justify-content:space-between;margin:0 0 24px;gap:18px}.section-title h2{font-size:27px;margin:0;letter-spacing:-.7px}.section-title>span{font:13px monospace;color:var(--muted)}.workbench{display:grid;grid-template-columns:280px 1fr;border:1px solid var(--line);border-radius:10px;overflow:hidden;box-shadow:0 12px 35px #12223608}.tool-list{background:var(--navy);padding:20px 12px;color:white}.group-label{font:11px monospace;letter-spacing:1.5px;color:#a5b8cd;padding:18px 12px 8px}.tool-button{width:100%;padding:12px;display:flex;align-items:center;gap:12px;background:transparent;border:0;border-radius:5px;color:#d7e2ee;text-align:left;cursor:pointer;font-size:14px;line-height:1.5}.tool-button:hover{background:#ffffff10}.tool-button.selected{background:#ffad45;color:#142338;font-weight:bold}.tool-num{font:12px monospace;opacity:.7}.calculator{padding:32px 38px}.calc-top{display:flex;justify-content:space-between;align-items:start;gap:16px}.calc-top h3{font-size:27px;letter-spacing:-.5px;margin:0;line-height:1.3}.free-tag{font:11px monospace;letter-spacing:1px;background:#eef3f8;border:1px solid var(--line);border-radius:3px;padding:5px 8px;white-space:nowrap}.calculator>p{margin:14px 0 25px;color:var(--muted)}.inputs{display:grid;grid-template-columns:1fr 1fr;gap:20px}label{display:flex;flex-direction:column;font-size:14px;font-weight:600;gap:7px}input,select{width:100%;font:16px Arial,sans-serif;border:1px solid #b8c5d2;background:white;border-radius:5px;padding:12px;color:var(--ink);min-width:0}input:focus,select:focus{outline:2px solid #df8a17;outline-offset:2px}.actions{display:flex;gap:20px;align-items:center;margin-top:24px}button{cursor:pointer}.primary{background:var(--navy);color:white;font-size:15px;font-weight:600;border:0;padding:13px 24px;border-radius:5px}.primary:hover{background:#284867}.reset{border:0;background:none;text-decoration:underline;color:var(--muted);font-size:14px;padding:8px}.result{margin:28px 0 20px;background:#edf3f9;border-left:3px solid #7b9bbd;padding:18px 22px;min-height:105px}.result-label{font:12px monospace;letter-spacing:1px;color:var(--muted)}.result-value{font-size:34px;font-weight:bold;letter-spacing:-1px;line-height:1.5}.result-small{font-size:14px;color:var(--muted)}.result.error{background:#fff0e8;border-color:#c25322}.result.error p{margin:5px 0}details{border-top:1px solid var(--line);padding-top:15px;font-size:14px}summary{cursor:pointer;font-weight:600}#formula{color:var(--muted);padding-top:8px}code{font-size:14px;background:#f3f5f7;padding:3px 5px;border-radius:3px;overflow-wrap:anywhere}.references{font-size:12px;color:var(--muted);margin-top:12px}.references a{margin-right:12px}#templates{padding:70px 0 52px}.template-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.template-card{border:1px solid var(--line);padding:24px;border-radius:7px;display:flex;flex-direction:column;align-items:start}.file-type{font:12px monospace;color:var(--muted);letter-spacing:1px;border-bottom:2px solid var(--orange);padding-bottom:6px}.template-card h3{font-size:19px;line-height:1.35;margin:18px 0 8px}.template-card p{font-size:14px;color:var(--muted);margin:0 0 24px;flex:1}.download{font-size:14px;font-weight:600;text-decoration:none;background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:8px 14px}.download:hover{background:#e2eaf3}.template-note{font-size:14px;color:var(--muted);margin-top:20px}.method{background:var(--navy);color:white;display:grid;grid-template-columns:1fr 1fr;padding:46px;gap:65px;margin-bottom:50px;border-radius:8px}.method .eyebrow{color:var(--orange)}.method h2{font-size:30px;line-height:1.25;margin:0 0 20px;letter-spacing:-.8px}.method p{color:#bccbdd;font-size:15px}.method-items>div{position:relative;padding-left:40px;margin-bottom:25px}.method-items>div:last-child{margin-bottom:0}.method-items span{position:absolute;left:0;top:4px;color:var(--orange);font:13px monospace}.method-items h3{font-size:17px;margin:0}.method-items p{margin:6px 0 0;font-size:14px}footer{max-width:1224px;margin:auto;border-top:1px solid var(--line);padding:27px 24px;display:flex;justify-content:space-between;gap:25px;align-items:center;font-size:12px;color:var(--muted)}footer p{margin:0}.footer-brand{font-size:13px;letter-spacing:1px;font-weight:bold;text-decoration:none;color:var(--ink)}:focus-visible{outline:2px solid #e38b16;outline-offset:4px}@media(max-width:900px){.header-note{display:none}.intro-aside{margin-right:0}.workbench{grid-template-columns:230px 1fr}.calculator{padding:25px}.template-grid{grid-template-columns:repeat(2,1fr)}.method{gap:30px;padding:30px}}@media(max-width:650px){header{padding:20px;gap:15px}nav{gap:16px}nav a{font-size:13px}.brand{font-size:10px}.brand b{font-size:15px}.mark{width:36px;height:36px;line-height:36px;font-size:28px}main{padding:0 18px}.intro{padding:36px 0}.intro-aside{display:none}h1{font-size:46px}.intro-copy{font-size:16px}.section-title{align-items:start;flex-direction:column;gap:6px}.workbench{display:block}.tool-list{display:flex;gap:6px;overflow:auto;padding:12px}.group-label{display:none}.tool-button{width:auto;flex-shrink:0;padding:10px 12px}.tool-num{display:none}.calculator{padding:24px 18px}.calc-top h3{font-size:24px}.free-tag{font-size:10px}.inputs{gap:15px}.result-value{font-size:30px}.template-grid{grid-template-columns:1fr}#templates{padding-top:42px}.method{display:block;padding:25px}.method-items{margin-top:30px}footer{flex-wrap:wrap;padding:24px 18px}footer p{width:100%;order:3}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Compact calculator-first layout and touch navigation */
.intro{padding:28px 0 24px}.intro h1{font-size:clamp(28px,3.2vw,42px);letter-spacing:-1px;line-height:1.2;margin-bottom:12px}.intro-copy{max-width:800px;font-size:16px}.tool-directory{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-bottom:26px}.tool-directory a{padding:12px 14px;border:1px solid var(--line);border-radius:6px;text-decoration:none;font-size:14px;font-weight:600;line-height:1.4}.tool-directory a:hover{background:#edf3f9;border-color:#7b9bbd}.tool-directory span{display:block;color:var(--muted);font-size:12px;font-weight:400;margin-top:4px}.worked-example{border-top:1px solid var(--line);margin-top:22px;padding-top:16px}.worked-example h4{margin:0 0 8px;font-size:16px}.worked-example p{margin:6px 0;font-size:14px;color:var(--muted)}.page-link{display:inline-block;margin:14px 0;font-size:14px}.result-value{overflow-wrap:anywhere}.brand{flex-shrink:0}nav a{min-height:44px;display:inline-flex;align-items:center}.inputs input,.inputs select{min-height:46px}code{overflow-wrap:anywhere}body{overflow-wrap:break-word}
@media(max-width:900px){.tool-directory{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:650px){header{flex-wrap:wrap;padding:16px 18px;gap:10px}nav{width:100%;justify-content:space-between;gap:10px}.brand{font-size:12px}.brand b{font-size:18px}.intro{padding:24px 0 18px}.intro h1{font-size:30px}.tool-directory{gap:8px;margin-bottom:22px}.tool-directory a{font-size:14px;padding:10px}.tool-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));overflow:visible}.tool-button{width:100%;white-space:normal;font-size:14px;min-height:48px}.inputs{grid-template-columns:1fr}.calc-top h3{font-size:23px}.section-title h2{font-size:24px}.result-value{font-size:28px}}