:root{color-scheme:dark;--bg:#0b1016;--panel:#121a24;--soft:#182330;--text:#e9eef3;--muted:#a3b0c0;--border:#314052;--accent:#b9ed91;--warn:#f6c77e;--red:#ffb5b5;--blue:#a9caff;font-family:"Segoe UI",system-ui,sans-serif}
    *{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.55}a{color:var(--blue);text-underline-offset:4px}header,main,footer{max-width:1160px;margin:auto;padding:24px}header{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;border-bottom:1px solid var(--border)}nav{display:flex;gap:20px}.brand{color:var(--text);letter-spacing:2px;font-weight:600;text-decoration:none}.eyebrow{color:var(--accent);font-size:12px;letter-spacing:1.5px;text-transform:uppercase}h1{font-size:clamp(28px,4vw,44px);line-height:1.15;font-weight:600;margin:12px 0 18px;max-width:800px}h2{font-size:23px;line-height:1.25;margin:0 0 16px}h3{font-size:17px;margin:20px 0 10px}p{margin:12px 0}.intro{max-width:850px;color:var(--muted);font-size:18px}.fact{border-left:3px solid var(--accent);padding:12px 18px;margin:28px 0;background:var(--panel)}.muted,small{color:var(--muted)}section{margin:38px 0}.preset-row{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}button,input{font:inherit}button{cursor:pointer;color:var(--text);background:var(--soft);border:1px solid var(--border);border-radius:4px;padding:10px 14px;min-height:44px}button[aria-pressed=true]{color:#172412;background:var(--accent);border-color:var(--accent)}button:hover{filter:brightness(1.12)}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}.calculator{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:28px;align-items:start}.inputs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}label{display:flex;flex-direction:column;gap:6px;font-size:14px}input{width:100%;min-width:0;color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:3px;padding:10px 12px;min-height:44px;font-size:16px;font-variant-numeric:tabular-nums}fieldset{padding:0;border:0;margin:0 0 24px;min-width:0}legend{font-weight:600;margin-bottom:12px}.results{background:var(--panel);border:1px solid var(--border);padding:24px;border-radius:4px}.result-main{font-variant-numeric:tabular-nums;font-size:42px;font-weight:600;line-height:1.2;margin:8px 0}.result-unit{font-size:16px;font-weight:400;color:var(--muted)}dl{margin:20px 0 0}dl div{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--border);padding:11px 0}dt{color:var(--muted)}dd{margin:0;white-space:nowrap;font-variant-numeric:tabular-nums}.timebar{display:flex;height:18px;gap:2px;margin:16px 0 8px;overflow:hidden}.timebar span{min-width:0}.timebar .search{background:var(--blue)}.timebar .work{background:var(--accent)}.timebar .extra{background:var(--warn)}.legend{display:flex;flex-wrap:wrap;gap:14px;font-size:12px;color:var(--muted)}.legend i{display:inline-block;width:9px;height:9px;margin-right:5px}.warning{color:var(--warn)}.error{color:var(--red)}.note{font-size:14px;color:var(--muted)}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:15px}th,td{padding:14px 12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}th{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.6px}td:first-child{min-width:165px}td p{margin:0 0 7px}.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.step{padding-top:18px;border-top:2px solid var(--border)}.step strong{color:var(--accent);font-size:14px}.step h3{margin:8px 0}.draft{white-space:pre-wrap;background:var(--panel);border:1px solid var(--border);padding:20px;line-height:1.65}details{padding:16px 0;border-top:1px solid var(--border)}summary{cursor:pointer;font-weight:500;min-height:32px}.sources{padding-left:20px}.sources li{margin:10px 0}footer{color:var(--muted);font-size:13px;border-top:1px solid var(--border)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
    @media(max-width:800px){.calculator{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.results{padding:20px}.intro{font-size:16px}header,main,footer{padding:20px}.result-main{font-size:36px}}
    @media(max-width:430px){.inputs{grid-template-columns:1fr}header,main,footer{padding:18px}nav{gap:16px;font-size:14px}.preset-row button{flex:1 1 140px}td,th{padding:12px 8px}}
    @media print{body{background:white;color:black}header,button,.preset-row{display:none}.calculator{display:block}.results,.fact,.draft{background:white;color:black}a{color:black}input{color:black;background:white}section{break-inside:avoid}}
.result-heading{margin-top:0}.legend-search{background:var(--blue)}.legend-work{background:var(--accent)}.legend-extra{background:var(--warn)}