:root{color-scheme:light;--bg:#f4f6f8;--surface:#fff;--text:#20281f;--muted:#626d61;--accent:#507516;--line:#dde3d9;--soft:#f0f4e9;--error:#a33322;--focus:#507516}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.5}body[data-theme=dark]{color-scheme:dark;--bg:#111412;--surface:#1b1f1b;--text:#eef1e8;--muted:#acb6a6;--accent:#c4e99c;--line:#3c4638;--soft:#252e22;--error:#ffafa2;--focus:#d4ff63}a{color:var(--accent)}button,input,select{font:inherit}button,select,summary{cursor:pointer}button{border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);padding:12px 16px;min-height:44px}button:hover:not(:disabled){border-color:var(--accent);background:var(--soft)}button:disabled{opacity:.45;cursor:default}button:focus-visible,summary:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:3px}header{max-width:1180px;margin:auto;padding:28px 32px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-size:28px;font-weight:750;text-decoration:none;letter-spacing:-1px;color:var(--text)}.header-actions{display:flex;gap:20px;align-items:center}.services{position:relative;font-size:14px}.services nav{position:absolute;right:0;top:35px;width:240px;padding:12px;background:var(--surface);border:1px solid var(--line);border-radius:16px;z-index:5;box-shadow:0 12px 40px #0001}.services a{display:block;padding:8px}select{padding:8px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--text);max-width:100%;min-height:44px}main{max-width:1120px;margin:auto;padding:30px 24px 64px}.intro{margin-bottom:32px}.eyebrow{color:var(--accent);font-size:11px;font-weight:750;letter-spacing:2px}h1{font-size:clamp(30px,4vw,46px);letter-spacing:-1.8px;line-height:1.15;margin:14px 0}h2{font-size:22px;letter-spacing:-.5px;margin:0 0 24px}.intro>p:last-child{color:var(--muted);margin-top:16px}.calculator{display:grid;grid-template-columns:1.12fr 1fr;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--surface);box-shadow:0 12px 38px #1b331006}.workspace{padding:28px}.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:32px}.modes button{font-size:13px;padding:9px 6px;border-color:transparent;background:var(--bg)}.modes button[aria-pressed=true]{background:var(--soft);color:var(--accent);border-color:var(--accent);font-weight:700}.fields{display:grid;grid-template-columns:1fr 28px 1fr;align-items:end;gap:8px}.fields label{min-width:0;font-size:13px;font-weight:600}.input-wrap{position:relative;margin-top:8px}.input-wrap input{width:100%;min-width:0;border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:12px;padding:14px 30px 14px 14px;font-size:24px;font-variant-numeric:tabular-nums;min-height:60px}.input-wrap span{position:absolute;right:12px;top:19px;color:var(--muted)}input[aria-invalid=true]{border-color:var(--error)}.connector{align-self:end;text-align:center;padding-bottom:19px;color:var(--muted)}.muted{color:var(--muted)}.small{font-size:12px}.error{color:var(--error);font-size:13px;margin:0;overflow-wrap:anywhere}.error:not(:empty){margin:12px 0}.tools{display:flex;justify-content:space-between;align-items:center;gap:8px;margin:20px 0}.text-button{border:0;font-size:12px;padding:8px 0;color:var(--accent);background:transparent}.tools>div{display:flex;gap:16px}.settings{font-size:13px;border-top:1px solid var(--line);padding-top:16px}.settings summary{color:var(--muted);min-height:32px}.settings label{margin-right:12px}.answer{background:var(--soft);padding:32px;display:flex;flex-direction:column;min-width:0}.result-head{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:12px}.live{white-space:nowrap}.live i{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-right:4px}.result{font-size:clamp(38px,5vw,64px);line-height:1.2;letter-spacing:-2px;font-weight:650;margin:30px 0 0;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.answer>p{font-size:13px}.delta{font-size:14px;padding:12px 0;border-top:1px solid var(--line)}.formula{font-size:13px;overflow-wrap:anywhere;color:var(--muted);margin:12px 0 24px}.warning{color:var(--error)}.copy-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto}.copy-actions button{font-size:13px}.primary{background:#d4ff63;color:#20281f;border-color:#b4db52;font-weight:650}.primary:hover:not(:disabled){background:#c5f24e}.local-note{margin-top:18px;color:var(--muted);font-size:11px!important}#copy-status{min-height:18px;color:var(--accent);margin:8px 0 0}#reverse{margin:-12px 0 24px;font-size:13px}#reverse label{display:block;margin-bottom:6px}#reverse select{width:100%}.help{margin-top:44px}.help h2{font-size:18px;margin-bottom:16px}.help-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.help details{font-size:13px;color:var(--muted)}.help summary{color:var(--text);font-weight:550;min-height:44px}.help p{margin-top:12px}footer{max-width:1120px;margin:auto;padding:24px;border-top:1px solid var(--line);font-size:12px;color:var(--muted);display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}footer p{width:100%;margin:0;font-size:11px}.skip{position:absolute;top:-60px;background:var(--surface);padding:8px;z-index:10}.skip:focus{top:0}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}[hidden]{display:none!important}@media(max-width:760px){header{padding:20px;gap:12px}.brand{font-size:24px}.header-actions{gap:10px}.services{font-size:12px}.theme-label select{font-size:12px;width:102px}main{padding:20px 16px 40px}.intro{margin-bottom:24px}.calculator{grid-template-columns:1fr}.workspace,.answer{padding:24px}.modes{margin-bottom:24px}.answer{border-top:1px solid var(--line)}.result{font-size:48px}.help-grid{grid-template-columns:1fr;gap:8px}.fields{gap:5px;grid-template-columns:1fr 20px 1fr}.input-wrap input{font-size:22px}.intro>p:last-child{font-size:14px}}@media(max-width:360px){header{padding:16px 12px}.header-actions{gap:8px}.workspace,.answer{padding:18px}.modes button{font-size:12px}.tools{align-items:flex-start}.tools>div{gap:8px}.fields{grid-template-columns:1fr}.connector{display:none}.result{font-size:42px}.result-head{font-size:11px}}