:root{--ink:#253a32;--muted:#626b62;--paper:#f7f5ee;--card:#fffefa;--line:#dddcd1;--gold:#8b6934;--green:#243d35;--soft:#edf0e8}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--green);text-underline-offset:4px}a:hover{color:#775625}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #a57836;outline-offset:4px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.2}h1,h2{font-family:Georgia,"Times New Roman",serif;font-weight:400}h1{font-size:clamp(2rem,3.8vw,3.7rem);letter-spacing:-.035em;margin-bottom:24px}h2{font-size:clamp(1.65rem,2.4vw,2.25rem);letter-spacing:-.02em;margin-bottom:20px}h3{font-size:1.1rem;margin:24px 0 12px}p{margin-bottom:20px}small{font-size:.75rem}em{font-style:normal;color:#826638}button:disabled{cursor:default;opacity:.5}[hidden]{display:none!important}.site-header{border-bottom:1px solid var(--line);background:var(--card)}.header-inner{max-width:1200px;margin:auto;padding:24px 32px;display:flex;gap:30px;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:14px;text-decoration:none;font-family:Georgia,serif;font-size:1.25rem;line-height:1.3;white-space:nowrap}.brand small{display:block;letter-spacing:.17em;font:9px/2 system-ui,sans-serif;margin-top:5px}.brand-mark{border:1px solid #b9a989;width:50px;height:50px;display:grid;place-items:center;font-size:20px;letter-spacing:-2px;border-radius:50%}.menu{display:flex;gap:8px;flex-wrap:wrap}.menu a{padding:10px 12px;font-size:.82rem;font-weight:600;text-decoration:none;border-radius:5px}.menu a:hover,.menu a[aria-current]{background:var(--soft)}.maincontainer{max-width:1200px;margin:auto;padding:40px 32px 60px;min-height:70vh}.hero{display:grid;grid-template-columns:1.5fr 1fr;align-items:center;gap:60px;padding:16px 0 48px}.eyebrow{font-size:.66rem;font-weight:700;letter-spacing:.17em;color:var(--gold);display:block;margin-bottom:16px}.lead{font-size:1.08rem;color:var(--muted);max-width:620px;line-height:1.75}.hero-links{display:flex;gap:28px;flex-wrap:wrap;font-size:.85rem;font-weight:600}.hero-links a:first-child{text-decoration:none}.hero-links span{margin-left:16px}.roman-art{position:relative;isolation:isolate;min-height:280px;border:1px solid #d9d6c8;border-radius:140px 140px 6px 6px;background:linear-gradient(135deg,#ece9dc,#f5f3e9 55%,#e5e7dd);display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden;color:#68755c}.art-caption{font-size:9px;letter-spacing:.32em;margin-bottom:15px}.art-number{font:clamp(2rem,4vw,3.9rem)/1 Georgia,serif;letter-spacing:-.06em;color:#3d5041}.art-number>span{color:#9c8252}.art-line{width:48px;height:1px;background:#a59774;margin:18px 0 10px}.art-value{font:16px Georgia,serif;letter-spacing:.22em}.pillars{position:absolute;bottom:-15px;inset-inline:25px;display:flex;justify-content:space-around;opacity:.1;z-index:-1}.pillars i{display:block;width:36px;height:180px;border-top:8px double #647255;border-bottom:8px double #647255;background:repeating-linear-gradient(90deg,transparent 0 5px,#647255 6px 8px)}.tool-layout{display:grid;grid-template-columns:minmax(0,1.9fr) minmax(260px,1fr);gap:28px;align-items:stretch}.converter{background:var(--card);border:1px solid var(--line);border-top:3px solid var(--green);border-radius:8px;padding:30px;box-shadow:0 8px 24px #28372e06;scroll-margin-top:20px}.converter-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}.converter-heading .eyebrow{margin:0}.free-badge{font-size:.65rem;background:var(--soft);color:#476347;padding:4px 8px;border-radius:20px;white-space:nowrap}.converter h2{font-size:1.8rem;margin-bottom:24px}.converter label{display:block;font-size:.85rem;font-weight:600;margin-bottom:9px}.input-row{display:flex;gap:10px}.input-row input{border:1px solid #bfc4b8;background:#fff;border-radius:5px;min-width:0;width:100%;padding:12px 14px;font-size:1.1rem;color:var(--ink)}.input-row input[aria-invalid=true]{border-color:#a43124}.btn{border:1px solid var(--green);background:var(--green);color:#fff;border-radius:5px;padding:12px 19px;white-space:nowrap;font-size:.87rem;font-weight:600;text-decoration:none;display:inline-block}.btn:hover{background:#355548;color:#fff}.btn span{margin-left:12px}.field-help{font-size:.72rem;line-height:1.6;color:var(--muted);margin:10px 0}.examples{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:.72rem;color:var(--muted)}.examples button{border:1px solid var(--line);background:transparent;border-radius:4px;padding:4px 10px;color:var(--ink);min-height:32px}.examples button:hover{background:var(--soft)}.error{color:#a12e22;font-size:.85rem;margin:0}.error:not(:empty){margin:14px 0}.result-box{margin-top:20px;padding:19px 22px;background:var(--soft);border:1px solid #dbe0d3;border-radius:5px;min-height:142px}.result-box .eyebrow{color:#51644c;font-size:.61rem;margin-bottom:4px}.result-box output{display:block;font:2.35rem/1.3 Georgia,serif;overflow-wrap:anywhere;max-height:220px;overflow:auto}.result-box p{font-size:.75rem;color:#52634d;margin:8px 0 0;overflow-wrap:anywhere}.result-actions{display:flex;gap:10px;justify-content:space-between;flex-wrap:wrap;align-items:center;margin-top:12px;font-size:.72rem;min-height:35px}.text-button{border:0;padding:6px 0;background:none;color:var(--green);text-decoration:underline;text-underline-offset:4px}.reference-card{background:#eeeee4;border:1px solid #dfdfd2;border-radius:8px;padding:30px}.reference-card h2{font-size:1.6rem}.reference-card>p{font-size:.8rem;color:var(--muted)}.symbols{margin:0}.symbols>div{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #d7d9cc;padding:5px 8px}.symbols dt{font:1.2rem Georgia,serif}.symbols dt a{text-decoration:none;display:block;min-width:50px}.symbols dd{font-size:.85rem;font-variant-numeric:tabular-nums;margin:0}.reference-note{margin:18px 0 0;line-height:1.6}.topic-links{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:28px 0 0}.topic-links a{display:flex;align-items:center;gap:12px;padding:18px 2px;border-bottom:1px solid var(--line);font-size:.79rem;text-decoration:none;line-height:1.5}.topic-links span{color:#a08e69;font-family:Georgia,serif}.topic-links b{margin-left:auto;font-weight:400}.article-section{margin-top:64px;scroll-margin-top:24px}.article-section>p{max-width:900px;color:#4e594f}.rule-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin:32px 0}.rule-grid article{border-top:1px solid #c7cbbb;padding-top:22px}.rule-number{font:1.8rem Georgia,serif;color:#9b814d}.rule-grid h3{margin-top:14px}.rule-grid p{font-size:.9rem;color:#5d675b}.number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden;margin:24px 0}.number-grid a{display:flex;justify-content:space-between;gap:10px;background:var(--card);padding:13px 20px;text-decoration:none}.number-grid a:hover{background:var(--soft)}.number-grid span{color:var(--muted);font-size:.8rem}.number-grid strong{font:1.2rem Georgia,serif}.year-callout{display:flex;gap:30px;justify-content:space-between;align-items:center;background:var(--green);color:#fff;padding:36px 40px;border-radius:8px;margin-top:55px}.year-callout .eyebrow{color:#d4c5a0}.year-callout h2{margin-bottom:12px}.year-callout p{font-size:.9rem;color:#d0d9cc}.year-callout a{color:#f3ebd8;font-size:.8rem}.year-callout .year-roman{font:clamp(2rem,4vw,3.3rem) Georgia,serif;text-decoration:none}.faq details{border-bottom:1px solid var(--line);padding:18px 0}.faq summary{cursor:pointer;font-weight:600;font-size:.95rem}.faq details p{margin:16px 0 4px;max-width:900px;color:var(--muted);font-size:.9rem}.site-footer{max-width:1136px;margin:auto;padding:35px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:30px;font-size:.75rem;color:var(--muted)}.site-footer>div:last-child{display:flex;gap:10px;flex-direction:column;text-align:right}.footer-brand{font:1.25rem Georgia,serif;text-decoration:none}.site-footer p{margin:10px 0}.breadcrumb{display:flex;gap:12px;flex-wrap:wrap;font-size:.73rem;color:var(--muted);margin-bottom:28px}.page-intro{max-width:840px;margin:12px 0 30px}.page-intro h1{font-size:clamp(2rem,3.4vw,3rem)}.maincontainer>.converter{max-width:820px}.dresult{font:clamp(2rem,5vw,3.8rem)/1.25 Georgia,serif;overflow-wrap:anywhere;background:var(--soft);border:1px solid #dbe0d3;padding:25px;border-radius:6px;margin-bottom:30px;max-height:320px;overflow:auto}.halfdetail{max-width:900px}.halfdetail h1{font-size:clamp(2rem,3.3vw,3rem)}.info{border-top:1px solid var(--line);padding-top:28px;margin-top:35px}.info h2{font-size:1.6rem}.contenttop{margin:24px 0}.clear{clear:both}table{border-collapse:collapse;width:100%;margin:20px 0 30px;font-size:.9rem;table-layout:fixed}td,th{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);overflow-wrap:anywhere}th{background:#e7eadd;font-weight:600}tr:nth-child(even){background:#f0f1e9}td strong{font-weight:600}caption{text-align:left;font-size:.8rem;color:var(--muted);padding-bottom:10px}.current-year{outline:2px solid #a28a55;outline-offset:-2px}.ad-slot{margin:40px 0 0;min-height:300px;text-align:center;border-top:1px solid var(--line);contain:layout}.ad-label{display:block;font-size:10px;letter-spacing:.1em;color:var(--muted);padding:10px}.adsbygoogle{min-height:250px}.skip-link{position:absolute;top:-100px;left:16px;background:#fff;padding:10px;z-index:100}.skip-link:focus{top:10px}.year-links{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.year-links a{background:var(--soft);padding:10px 15px;border:1px solid var(--line);border-radius:4px}.detail-links{display:flex;gap:15px;flex-wrap:wrap;margin:24px 0}.extension-note{background:#eee7d8;border-left:3px solid #a38750;padding:14px 18px;font-size:.9rem}
@media(max-width:1000px){.header-inner{flex-direction:column;gap:15px;align-items:flex-start}.hero{gap:30px}.maincontainer{padding-top:30px}.site-footer{margin:0 32px}.menu{gap:3px}.menu a:first-child{padding-left:0}.tool-layout{grid-template-columns:minmax(0,1.65fr) minmax(240px,1fr)}.converter,.reference-card{padding:24px}.input-row{flex-wrap:wrap}.input-row .btn{width:100%}}
@media(max-width:700px){.header-inner{padding:18px 20px;gap:12px}.brand-mark{width:42px;height:42px}.brand{font-size:1.13rem}.menu{display:grid;grid-template-columns:1fr 1fr;gap:2px 12px;width:100%}.menu a{padding:8px!important;font-size:.74rem}.maincontainer{padding:28px 20px 40px}.hero{display:block;padding:0 0 30px}.hero-copy h1{font-size:2.3rem}.hero .eyebrow{font-size:.58rem}.lead{font-size:1rem}.roman-art{display:none}.hero-links{gap:18px;font-size:.78rem}.tool-layout{grid-template-columns:1fr;gap:20px}.converter,.reference-card{padding:22px 18px}.converter h2{font-size:1.65rem}.free-badge{font-size:.6rem}.converter-heading .eyebrow{font-size:.59rem}.reference-card h2{margin-bottom:10px}.symbols{display:grid;grid-template-columns:repeat(7,1fr);gap:3px}.symbols>div{flex-direction:column;padding:5px 0;gap:8px;border-bottom:0}.symbols dt a{min-width:0}.symbols dd{font-size:.7rem}.reference-card .reference-note{border-top:1px solid var(--line);padding-top:15px}.reference-note br{display:none}.topic-links{grid-template-columns:1fr;gap:0;margin-top:16px}.topic-links a{padding:16px 0}.article-section{margin-top:42px}.rule-grid{grid-template-columns:1fr;gap:12px}.rule-grid article{padding-top:16px}.rule-grid p{margin-bottom:12px}.number-grid{grid-template-columns:repeat(4,1fr)}.number-grid a{flex-direction:column;gap:2px;padding:10px 12px}.year-callout{padding:25px;flex-direction:column;align-items:flex-start;gap:10px}.year-callout .year-roman{font-size:2.4rem}.site-footer{margin:0 20px;flex-direction:column;padding:28px 0;gap:18px}.site-footer>div:last-child{text-align:left}.breadcrumb{font-size:.69rem;gap:8px}.ad-slot{min-height:300px}td,th{padding:10px 9px;font-size:.82rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* The heading slot is mobile-only; reserve its space before AdSense loads. */
.ad-slot-mobile{display:none}
.ad-slot-content{margin-bottom:40px}
.after-ad-heading{margin-top:40px}
@media(max-width:767px){.ad-slot-mobile{display:block;min-height:138px;margin:24px 0;border-bottom:1px solid var(--line)}.ad-slot-mobile .ad-label{padding:7px 0;font-size:10px}.ad-slot-mobile .adsbygoogle{min-height:0}}
