:root{color-scheme:dark;--bg:#101923;--panel:#152638;--line:#34495b;--muted:#bed0df;--blue:#0964b8;--red:#e84e3b;--amber:#ffc966;--cyan:#86cdfd}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:#eaf0f5;font:16px/1.5 Arial,Helvetica,sans-serif}header{position:sticky;top:0;z-index:10;border-bottom:1px solid var(--line);background:#101923f5;display:flex;align-items:center;justify-content:space-between;gap:22px;padding:14px max(24px,calc((100vw - 1380px)/2))}header img{display:block;width:210px;max-width:42vw}header nav{display:flex;gap:24px;flex-wrap:wrap}a{color:#bce1ff}header a{color:#fff;font-weight:700;text-decoration:none}main{max-width:1380px;margin:auto;padding:24px}.page-title{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px}.eyebrow{color:var(--cyan);font-size:13px;font-weight:700;letter-spacing:.08em;margin:0 0 8px}h1{font-size:clamp(25px,3.1vw,36px);line-height:1.15;margin:0 0 9px}h2{font-size:18px;margin:0 0 16px}.intro{color:var(--muted);margin:0}button{font:inherit;color:#fff;background:#1b344b;border:1px solid #64849d;border-radius:4px;padding:11px 15px;min-height:44px;cursor:pointer}button:hover{background:#234b6b}:is(input,select,button,a,summary):focus-visible{outline:3px solid var(--cyan);outline-offset:3px}.summary{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);margin-bottom:24px}.summary>div{padding:14px 22px;background:var(--panel);min-width:0}.summary .total{background:#07599e;border-bottom:3px solid var(--red)}.summary span{display:block;font-size:14px}.summary strong{font-size:clamp(23px,2.3vw,32px);line-height:1.5;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.summary strong small{font-size:16px;font-weight:400}.workspace{display:grid;grid-template-columns:350px minmax(0,1fr);gap:24px}.inputs{background:var(--panel);border:1px solid var(--line);padding:20px;margin-bottom:16px}.inputs h2{color:var(--cyan);font-size:15px;display:flex;gap:12px}.inputs h2 span{color:#fff;font-size:18px}label{display:block;font-size:14px;font-weight:700;min-width:0;margin-bottom:12px}label>span{float:right;color:var(--muted);font-weight:400}input,select{width:100%;display:block;min-height:46px;border:1px solid #607c91;border-radius:3px;background:#0f1c28;color:#fff;font:16px Arial,Helvetica,sans-serif;padding:10px;margin-top:6px}input:invalid{border-color:#f5a577}.fields{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}.help{color:var(--muted);font-size:14px;line-height:1.5;margin:6px 0 12px}.help:last-child{margin-bottom:0}fieldset{border:0;border-top:1px solid #405769;margin:8px 0 0;padding:10px 0 0;min-width:0}legend{color:var(--amber);font-size:14px;font-weight:700;padding:0 10px 0 0}.output{min-width:0}.drawing,.breakdown{border:1px solid var(--line);background:#122232;margin-bottom:18px}.drawing-title{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:16px 20px;border-bottom:1px solid var(--line);flex-wrap:wrap}.drawing-title h2{margin:0}.drawing-title>span{font-size:13px;color:var(--muted)}svg{width:100%;display:block;overflow:visible}svg text{font-family:Arial,Helvetica,sans-serif}.drawing p{font-size:14px;color:var(--muted);padding:0 20px 16px;margin:0}.breakdown{padding:20px}.table-scroll{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:14px;font-variant-numeric:tabular-nums}th,td{padding:10px 8px;border-bottom:1px solid var(--line)}th{color:var(--muted);font-weight:400}td{font-weight:700}.working{font-size:16px;color:var(--amber);line-height:1.7}.result-note{color:var(--muted);font-size:14px;border-left:3px solid var(--amber);padding:0 0 0 14px}.method-notes{border-top:1px solid var(--line);padding-top:16px;font-size:14px;color:var(--muted)}summary{cursor:pointer;min-height:44px;font-size:16px;color:#fff;font-weight:700}.error{background:#442820;border:1px solid #e88766;padding:20px;margin-bottom:18px}.error ul{margin:8px 0 0;padding-left:20px}.error li{margin:10px 0}.error strong{color:#ffcfb9}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}footer{border-top:1px solid var(--line);padding:24px;text-align:center;font-size:14px;color:var(--muted)}footer a{display:inline-block;margin-left:16px}[hidden]{display:none!important}@media(max-width:900px){.workspace{grid-template-columns:300px minmax(0,1fr);gap:16px}.inputs{padding:16px}.page-title{align-items:flex-start;flex-direction:column}.summary>div{padding:12px 14px}}@media(max-width:720px){header{padding:12px 16px}header nav{gap:4px;font-size:14px;flex-direction:column;align-items:flex-end}main{padding:20px 14px}.workspace{grid-template-columns:1fr}.summary{grid-template-columns:1fr 1fr;gap:1px}.summary .total{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center}.summary strong{font-size:25px}.summary span{font-size:13px}.summary>div{padding:10px 14px}#calculator{display:grid;gap:12px}.inputs{margin-bottom:0}.drawing-title{padding:14px}.drawing p{padding:0 14px 14px;font-size:14px}.breakdown{padding:14px}.drawing-title>span{font-size:12px}footer a{display:block;margin:8px 0 0}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s}}