:root{--paper:#f5f3ec;--ink:#293b33;--muted:#5f695b;--line:#dedfd5;--green:#253d35;--green-light:#dbe3d4;--clay:#ae553b;--white:#fffef9;--radius:14px}
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.site-header{height:88px;width:min(1320px,calc(100% - 80px));margin:auto;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:24px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:21px;letter-spacing:-.9px;text-decoration:none;white-space:nowrap}.brand svg{width:34px;height:34px}.brand-light{font-weight:400}.site-header nav{display:flex;gap:32px;font-size:13px}.site-header nav a{text-decoration:none;position:relative}.site-header nav a:hover{color:var(--clay)}.site-header nav .active:after{content:"";position:absolute;bottom:-32px;height:2px;left:0;right:0;background:var(--clay)}.header-note{font-size:12px;display:flex;gap:8px;align-items:center;color:var(--muted)}.status-dot{height:6px;width:6px;background:#6f875e;display:inline-block;border-radius:100%;flex-shrink:0}
.hero{position:relative;padding-top:43px;padding-bottom:35px}.eyebrow{display:flex;align-items:center;gap:9px;font-size:10px;letter-spacing:2px;font-weight:700;color:var(--clay)}.eyebrow>span{height:5px;width:20px;background:var(--clay)}h1,h2,h3,p{margin-top:0}h1{font-size:61px;line-height:1.08;letter-spacing:-3px;margin:17px 0 18px;font-weight:500}h1 em{font-family:Georgia,'Times New Roman',serif;font-weight:400;color:var(--clay)}.hero-copy{font-size:15px;line-height:1.65;color:var(--muted);margin:0}.hero-stamp{position:absolute;right:25px;top:64px;width:150px;height:150px;border:1px solid #b7bbae;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;transform:rotate(10deg);gap:4px;color:var(--muted)}.hero-stamp:after{content:"";position:absolute;inset:6px;border:1px dashed #c4c7ba;border-radius:50%}.hero-stamp span{font-size:8px;letter-spacing:1.6px}.hero-stamp svg{width:56px;height:56px}
.workspace{display:grid;grid-template-columns:1.1fr 1fr;align-items:start;border:1px solid #d8dccf;border-radius:var(--radius);overflow:hidden;background:var(--white);box-shadow:0 12px 36px #283d3205}.input-panel{padding:29px 32px 22px;min-width:0}.panel-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px;gap:12px}.panel-heading>div,.result-heading{display:flex;align-items:center;gap:11px}.panel-heading h2,.result-heading h2{font-size:17px;letter-spacing:-.3px;margin:0;font-weight:500}.step-tag{font-family:Georgia,serif;color:var(--muted);font-size:12px;border:1px solid #d7ddce;border-radius:50%;width:25px;height:25px;display:flex;align-items:center;justify-content:center}.unit-toggle{display:flex;border:1px solid var(--line);padding:3px;border-radius:7px;margin:0;gap:0}.unit-toggle input,.shape-picker input{position:absolute;width:1px;height:1px;opacity:0}.unit-toggle label{cursor:pointer}.unit-toggle span{display:block;padding:4px 10px;font-size:11px;border-radius:4px;white-space:nowrap}.unit-toggle input:checked+span{background:var(--green);color:white}.unit-toggle input:focus-visible+span,.shape-picker input:focus-visible+span{outline:3px solid var(--clay);outline-offset:3px}
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.trust-strip{display:flex;justify-content:center;gap:38px;padding:20px 0;border-bottom:1px solid var(--line);font-size:10px;color:var(--muted)}.trust-strip>span{display:flex;align-items:center;gap:8px}.trust-strip svg{width:16px;height:16px;stroke:#77896d;fill:none;stroke-width:1.2}.notice{padding:20px;background:#fff1df}.guide-section{padding:75px 0 0}.section-intro{display:flex;justify-content:space-between;gap:50px;margin-bottom:30px;align-items:flex-end}.section-intro h2,.reference-copy h2,.example-section h2,.faq-section h2{font-size:34px;line-height:1.17;font-weight:400;letter-spacing:-1.2px;margin:13px 0 0}.section-intro>p{max-width:330px;font-size:13px;color:var(--muted);margin:0}.guide-cards{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:8px;overflow:hidden}.guide-cards article{padding:27px 27px 23px}.guide-cards article+article{border-left:1px solid var(--line)}.guide-number{font-size:9px;color:var(--muted);letter-spacing:1.3px}.guide-cards h3{font-size:17px;font-weight:500;letter-spacing:-.3px;margin:16px 0 12px}.guide-cards p{font-size:12px;color:var(--muted);line-height:1.8;margin-bottom:16px}.formula{background:#eaece2;padding:10px 9px;border-radius:4px;font-family:'Courier New',monospace;font-size:11px;color:#4a6248;white-space:nowrap}.guide-cards .small-copy{font-size:10px;color:var(--muted);margin-top:13px;margin-bottom:0}.reference-section{display:grid;grid-template-columns:1fr 1.2fr;gap:80px;padding-block:70px;border-bottom:1px solid var(--line)}.reference-copy>p{font-size:13px;color:var(--muted);margin:20px 0}.arrow-link{font-size:11px;text-decoration:none;border-bottom:1px solid #bac2b0;padding-bottom:5px}.arrow-link span{padding-left:6px;color:var(--clay)}.table-shell table{width:100%;border-collapse:collapse;text-align:left;font-size:12px}.table-shell th{font-weight:500}.table-shell thead th{font-size:9px;letter-spacing:.7px;text-transform:uppercase;color:var(--muted);padding:10px 14px;border-bottom:1px solid #bfc8b6}.table-shell tbody td,.table-shell tbody th{padding:13px 14px;border-bottom:1px solid var(--line)}.table-shell tbody td:last-child{font-weight:600}.table-shell .highlight-row{background:#e9eddc}.highlight-row th>span{font-size:7px;letter-spacing:.7px;color:var(--muted);margin-left:8px}.table-shell>p{font-size:10px;color:var(--muted);margin:13px 0 0}
.example-section{margin-block:55px;background:#ede6d7;border:1px solid #e3dccd;border-radius:10px;padding:40px 45px;display:grid;grid-template-columns:1.2fr 1fr;gap:80px;align-items:center}.example-section p{font-size:13px;color:var(--muted);margin-top:18px}.example-section p strong{font-weight:500;color:var(--ink)}.primary-button{display:inline-flex;gap:32px;align-items:center;border:1px solid var(--green);border-radius:5px;padding:11px 16px;font-size:11px;color:var(--green);background:transparent;margin-top:5px}.primary-button:hover{background:var(--green);color:white}.example-math{background:#f8f5ed;padding:27px;border-radius:5px;transform:rotate(-2deg);box-shadow:0 3px 12px #6a604009}.example-math>span{font-size:8px;letter-spacing:1.5px;color:var(--muted)}.example-math>p{font-family:Georgia,serif;color:var(--ink);font-size:23px;margin:10px 0 18px}.example-math hr{border:0;border-top:1px solid #d8ddca;margin-bottom:17px}.example-math>div{display:flex;justify-content:space-between;gap:12px;font-size:11px;margin-top:9px}.example-math strong{font-weight:500}.example-math>div:last-child{color:var(--clay)}.faq-section{display:grid;grid-template-columns:1fr 1.4fr;gap:65px;padding-block:30px 65px}.faq-section>div>p{font-size:13px;color:var(--muted);margin-top:20px}.faq-list details{border-bottom:1px solid var(--line)}.faq-list details:first-child{border-top:1px solid var(--line)}.faq-list summary{font-size:13px;padding:17px 26px 17px 0;position:relative;cursor:pointer;list-style:none}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary:after{content:"+";position:absolute;right:4px;top:13px;color:var(--muted);font-size:19px;font-weight:400}.faq-list details[open] summary:after{content:"−"}.faq-list p{font-size:12px;color:var(--muted);padding-right:18px;margin:0 0 20px;line-height:1.85}.method-section{border-top:1px solid var(--line);padding-block:30px;color:var(--muted);max-width:1160px}.method-section h2{font-size:14px;font-weight:500;color:var(--muted)}.method-section p{font-size:11px;line-height:1.85;max-width:880px;margin-bottom:10px}.method-section .small-copy{font-size:10px}.site-footer{border-top:1px solid var(--line);padding-block:24px 32px;display:flex;justify-content:space-between;align-items:center;gap:24px}.site-footer .brand{font-size:16px;letter-spacing:-.6px}.site-footer>p{font-family:Georgia,serif;font-style:italic;font-size:12px;margin:0;color:var(--muted)}.site-footer>div{display:flex;gap:20px;font-size:10px;color:var(--muted)}.site-footer a{text-decoration:none}.privacy-content{max-width:760px;padding-block:60px}.privacy-content h1{font-size:45px}.privacy-content h2{font-size:22px;margin-top:30px}.privacy-content p{color:#63715d}
@media(min-width:1400px){.hero{padding-top:50px;padding-bottom:40px}}
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@media(max-width:370px){.site-header nav{gap:12px}.brand{font-size:16px}.brand svg{width:24px}.input-panel{padding:21px 17px}.panel-heading h2{font-size:15px}.result-panel{padding-inline:21px}.hero h1{font-size:42px}.shape-picker{gap:7px}.shape-picker label>span{font-size:10px}.hint-inline{font-size:10px}.result-heading h2{font-size:14px}.total-label{font-size:8px}.unit-toggle span{padding:4px 8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
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