:root{color-scheme:dark;--bg:#0b1720;--panel:#142630;--line:#314c58;--text:#edf6f6;--muted:#acc1ca;--mint:#8ee4c7}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:radial-gradient(ellipse at top right,#193c40 0,transparent 45%),var(--bg);color:var(--text);font:16px/1.65 system-ui,sans-serif}header{max-width:1240px;margin:auto;padding:26px 28px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}a{color:var(--mint);text-underline-offset:4px}header a{text-decoration:none}header nav{display:flex;gap:24px;font-size:.88rem}.logo{display:flex;align-items:center;gap:12px;font-size:25px;font-weight:800;color:var(--text);letter-spacing:-1px}main{max-width:1184px;margin:auto;padding:0 28px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(38px,6vw,66px);line-height:1.1;letter-spacing:-2.4px;margin-bottom:22px}h1 span{color:var(--mint)}h2{font-size:clamp(24px,3vw,32px);line-height:1.25;letter-spacing:-.8px}h3{font-size:23px;line-height:1.25;margin-bottom:14px}.intro{display:flex;gap:60px;padding:64px 0 46px;align-items:center}.intro>div:first-child{flex:1}.lead{color:var(--muted);max-width:660px;font-size:17px}.eyebrow{font-size:11px;font-weight:800;letter-spacing:2px;color:var(--mint);margin-bottom:13px}.meta{display:flex;flex-wrap:wrap;gap:18px;color:var(--muted);font-size:12px}.math-art{width:220px;flex-shrink:0;aspect-ratio:1;display:flex;flex-direction:column;align-items:center;justify-content:center;border:1px solid #426461;border-radius:50%;transform:rotate(-7deg);box-shadow:0 0 0 16px #8ee4c704,0 0 0 34px #8ee4c702;color:#a8d6cc}.math-art strong{font-size:70px;color:var(--mint);font-family:Georgia,serif}.math-art span{font-size:12px}.calculator{padding:30px;border:1px solid #45665f;border-radius:24px;background:linear-gradient(145deg,#183139,#13252e);box-shadow:0 20px 60px #0002;scroll-margin-top:24px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:20px}.section-head a{font-size:13px}.selector{max-width:680px;display:grid;gap:7px;font-size:13px;margin:6px 0 26px}input,select,button{font:inherit}input,select{width:100%;min-height:49px;padding:12px 14px;background:#0d1e28;color:var(--text);border:1px solid #49616e;border-radius:10px}input:focus-visible,select:focus-visible,button:focus-visible,a:focus-visible{outline:3px solid var(--mint);outline-offset:3px}button{cursor:pointer;min-height:44px;padding:10px 16px;border-radius:10px;border:1px solid #4a6672;background:#1b333e;color:var(--text);font-weight:650}button:hover{background:#2a4752}button.primary{background:var(--mint);color:#0b292c;border-color:var(--mint)}button.primary:hover{background:#b6f3df}.calc-layout{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start}.fields{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:grid;gap:7px;min-width:0;font-size:13px}.field-input{display:flex;gap:7px}.field-input input{min-width:0}.field-input select{width:107px;flex-shrink:0}.field-wide{grid-column:1/-1}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.hint{font-size:12px;color:var(--muted);margin:13px 0 0}.result{background:#0b1c25;border:1px solid #35565f;border-radius:16px;padding:23px;min-height:170px;overflow-wrap:anywhere}.answer{font-size:clamp(25px,4vw,37px);color:var(--mint);font-weight:750;line-height:1.3;margin:10px 0 18px}.result .formula{font-size:17px}.result ul{padding-left:18px;font-size:12px;color:var(--muted)}.result .work{border-top:1px solid var(--line);padding-top:14px;font-size:14px}.result .error{color:#ffc0b8;margin:10px 0}.result dl{display:grid;grid-template-columns:1fr 1.2fr;gap:8px 12px;font-size:13px}.result dt{color:var(--muted)}.result dd{margin:0}.calc-note{font-size:13px;color:#b9ccc8;margin:23px 0 0;padding-top:18px;border-top:1px solid #36565b}.collection{padding:55px 0 0}.collection>label{display:block;font-size:13px;color:var(--muted);margin:18px 0 8px}.collection>input{padding:17px 19px;font-size:16px}.search-row{display:flex;align-items:end;gap:20px;flex-wrap:wrap;margin:18px 0 26px}.search-row label{font-size:12px;display:grid;gap:6px;max-width:260px;flex:1}.search-row p{font-size:13px;color:var(--muted);margin:auto 0 10px}.search-row button{margin-left:auto}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.card{background:var(--panel);padding:26px;border:1px solid var(--line);border-top:3px solid #84bdad;border-radius:18px;min-width:0;display:flex;flex-direction:column;scroll-margin-top:24px}.card p{color:var(--muted);font-size:14px}.formula{font:600 21px/1.5 ui-monospace,monospace;color:#dff6ed;overflow-wrap:anywhere;padding:14px;background:#0c1e27;border-radius:10px;margin-bottom:18px}.card .example{border-left:3px solid #7bc3ab;padding:10px 13px;background:#10212a;color:#cde5e2}.card .pitfall{font-size:12px;color:#e2c7a1}.card button{align-self:start;margin-top:auto}.card a{font-size:11px;margin-top:12px}.no-results{grid-column:1/-1;padding:30px;border:1px dashed var(--line);border-radius:14px;color:var(--muted)}footer{border-top:1px solid var(--line);margin-top:50px;padding:27px 0 36px;color:#93adb7;font-size:12px}@media(max-width:800px){.math-art{display:none}.calc-layout{grid-template-columns:1fr}.cards{grid-template-columns:1fr 1fr}.section-head{align-items:start}.section-head a{max-width:120px}}@media(max-width:580px){header{padding:19px 18px;align-items:start}.logo{font-size:20px}.logo img{width:29px;height:29px}header nav{flex-direction:column;gap:5px;font-size:11px;align-items:end}main{padding:0 18px}.intro{padding:36px 0 28px}h1{letter-spacing:-1.5px}.calculator{padding:20px 16px;border-radius:18px}.section-head{display:block}.section-head a{display:inline-block;max-width:none;margin-bottom:20px}.fields{grid-template-columns:1fr}.field-wide{grid-column:auto}.cards{grid-template-columns:1fr}.search-row{gap:12px}.search-row label{flex-basis:100%;max-width:none}.search-row button{margin-left:0}.card{padding:22px}.result{padding:18px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{header nav,.math-art,.actions,.card button{display:none}body{background:white;color:black}.calculator,.card,.result{background:white;color:black;box-shadow:none;break-inside:avoid}.cards{display:block}.card{margin:16px 0}.card p,.hint,.lead,.calc-note{color:#333}.formula{background:#eee;color:black}.answer{color:black}}

/* Flexible net trade table */
.trade-shortcut{font-size:14px}.trade-layout{grid-template-columns:1fr}.trade-fields{display:block}.trade-scroll{overflow-x:auto;margin-top:24px;border:1px solid var(--line);border-radius:12px}.trade-table{border-collapse:collapse;width:100%;min-width:540px;table-layout:fixed}.trade-table caption{text-align:left;padding:14px 16px;color:var(--muted);font-size:12px;background:#0c1e27}.trade-table th,.trade-table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}.trade-table thead th{font-size:12px;color:var(--mint);background:#0c1e27}.trade-table th:first-child{width:42%}.trade-table th{font-size:13px;font-weight:500}.trade-table input{min-height:42px;padding:9px 10px;font-size:14px}.trade-table input::placeholder{color:#89a0aa;font-size:12px}.trade-total{background:#8ee4c708}.trade-total th{font-weight:750;color:#d8f3e9}.trade-derived{display:block;font-size:12px;color:var(--mint);margin-top:6px;overflow-wrap:anywhere}.trade-derived[hidden]{display:none}.trade-layout .result{max-width:none}.trade-layout .result details{margin-top:20px}.trade-layout .result summary{cursor:pointer;color:var(--mint)}.trade-layout .result ol{font-size:13px;color:var(--muted);padding-left:23px}.trade-layout .result li{margin:9px 0}@media(max-width:580px){.trade-table th,.trade-table td{padding:9px}.trade-fields .actions{gap:8px}.trade-fields .actions button{font-size:12px}.trade-scroll{margin-left:-5px;margin-right:-5px}}@media print{.trade-table input{border:1px solid #ccc;color:black;background:white}.trade-derived{color:black}.trade-scroll{overflow:visible}.trade-table{min-width:0}.trade-shortcut{display:none}}

.data-input{display:grid;grid-template-columns:minmax(70px,1fr) minmax(150px,1.6fr)}.data-input select{width:100%}.result details summary{cursor:pointer;color:var(--mint);font-size:13px}.result details{margin-top:18px}.result details dl{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}