:root{color-scheme:light;--ink:#172f3e;--muted:#526674;--line:#dbe5e8;--accent:#087f7b;--paper:#fff;--wash:#f2f7f7;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--wash);color:var(--ink);line-height:1.65}a{color:var(--accent);text-underline-offset:3px}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}header{max-width:1120px;margin:auto;padding:26px 24px;display:flex;justify-content:space-between;align-items:center;gap:16px}.brand{font-size:14px;font-weight:750;letter-spacing:.05em;color:var(--ink);text-decoration:none}.edition{color:var(--muted);font-size:12px}main{max-width:1120px;margin:0 auto;padding:12px 24px 90px}.eyebrow{font-size:12px;letter-spacing:.12em;color:var(--accent);font-weight:750;margin:14px 0 8px}h1{font-size:clamp(28px,4.8vw,44px);letter-spacing:-.055em;line-height:1.25;margin:0 0 16px;max-width:870px}.intro{color:var(--muted);max-width:780px;font-size:16px;margin:0 0 30px}.workspace{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);gap:24px;align-items:start}.panel{background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:28px}.panel h2,.reference h2{margin:0 0 20px;font-size:18px;letter-spacing:-.025em}.row{margin-bottom:20px}.row label{display:block;font-size:14px;font-weight:650;margin-bottom:7px}.input-pair{display:grid;grid-template-columns:minmax(0,1fr) minmax(110px,145px);gap:9px}input,select{min-width:0;width:100%;min-height:48px;border:1px solid #a9bdc5;border-radius:9px;padding:10px 12px;color:var(--ink);background:white}input{font-variant-numeric:tabular-nums}select{padding-right:7px}.field-note{font-size:12px;color:var(--muted);margin:5px 0 0}.condition{display:flex;align-items:flex-start;gap:10px;font-size:13px;margin:16px 0}.condition input{min-height:22px;width:22px;flex-shrink:0;margin:2px 0}.actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}button{border:1px solid var(--line);border-radius:9px;background:white;color:var(--ink);min-height:44px;padding:10px 16px;font-weight:650}.primary{background:var(--accent);border-color:var(--accent);color:white;flex:1;min-width:150px}button:hover{filter:brightness(.96)}.output-panel{position:sticky;top:20px;overflow-wrap:anywhere;background:#133843;color:#eefafa;border-color:#133843}.output-panel h2{color:#a9d5d7;margin-bottom:14px}.result-caption{font-size:13px;color:#bcdadd;margin:0 0 18px}.number{font-size:clamp(26px,3.1vw,40px);font-weight:750;line-height:1.35;font-variant-numeric:tabular-nums;letter-spacing:-.035em}.result-unit{font-size:16px;color:#bcdadd;display:block;margin:6px 0 22px;min-height:26px}.output-panel label{display:block;font-size:12px;margin-bottom:6px;color:#bcdadd}.output-panel select{margin-bottom:8px}.status{font-size:13px;min-height:44px;margin:18px 0 0;color:#c5dee1}.status.error{color:#ffb3a6}.status.success{color:#99ebd2}.status.notice{color:#ffe0a0}.copy{background:transparent;color:#e8f7f6;border-color:#48747f;margin-top:14px}.formula{border-top:1px solid #42626d;margin-top:24px;padding-top:20px}.formula p{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:16px;white-space:pre-wrap;overflow-wrap:anywhere;margin:8px 0}.formula span{font-size:11px;color:#bcdadd;letter-spacing:.08em}.local-note{font-size:12px;color:var(--muted);margin:15px 0 0}.reference{margin-top:28px;background:white;border:1px solid var(--line);border-radius:20px;padding:26px;overflow-wrap:anywhere}.reference p,.reference li{font-size:14px}.reference ul{padding-left:20px}.reference h3{font-size:14px;margin:24px 0 8px}.reference details{margin-top:18px}.reference summary{cursor:pointer;color:var(--accent);font-size:14px;min-height:44px;display:flex;align-items:center}.reference .small{font-size:12px;color:var(--muted)}footer{max-width:1120px;padding:0 24px 65px;margin:0 auto;color:var(--muted);font-size:12px}.more-apps{position:fixed;right:16px;bottom:12px;z-index:10;font-size:11px;color:#64748b;text-decoration:none;padding:10px 12px;border-radius:8px;background:rgba(255,255,255,.94);min-height:40px;display:flex;align-items:center}.more-apps:hover{text-decoration:underline}:focus-visible{outline:3px solid #06a7a1;outline-offset:3px}.skip{position:absolute;left:-9999px}.skip:focus{left:15px;top:10px;background:white;padding:10px;z-index:50}[hidden]{display:none!important}
@media(max-width:720px){header{padding:20px 18px}.edition{font-size:11px}main{padding:8px 16px 70px}.workspace{grid-template-columns:1fr;gap:18px}.panel{padding:22px 20px;border-radius:16px}.output-panel{position:static}.reference{padding:22px 20px}.input-pair{grid-template-columns:minmax(0,1fr) 115px}.actions{gap:8px}h1{font-size:30px}.number{font-size:34px}.intro{font-size:14px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* Static language navigation; native language names remain visible without JS. */
header{flex-wrap:wrap}.language-links{max-width:1120px;margin:0 auto 18px;padding:0 24px;display:flex;flex-wrap:wrap;gap:8px}.language-links a{display:flex;align-items:center;min-height:40px;padding:6px 12px;border:1px solid var(--line);border-radius:8px;text-decoration:none;font-size:13px;background:white}.language-links a[aria-current=page]{background:var(--accent);color:white;border-color:var(--accent)}h1,.intro,.edition,.row label,button{overflow-wrap:anywhere}button{max-width:100%}@media(max-width:720px){.language-links{padding:0 16px;margin-bottom:20px;gap:6px}.language-links a{padding:6px 10px}h1{letter-spacing:-.025em}}