/* Scoped styles: the exercise inherits the site's editorial type and palette. */
.operating-lab{--lab-line:rgba(23,61,58,.2);--lab-muted:#566a60;color:var(--ink,#173d3a)}
.lab-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:32px;margin-bottom:18px}
.lab-heading .eyebrow{color:var(--ochre,#9f5432);margin-bottom:14px}
.lab-heading h2{max-width:700px;font-size:clamp(27px,2.9vw,38px);line-height:1.4}
.lab-sample-tag{flex-shrink:0;font-size:10px;letter-spacing:.3px;padding:8px 11px;border:1px solid var(--lab-line);margin-top:5px;line-height:1.6}
.lab-intro{max-width:720px;color:var(--lab-muted);font-size:14px;line-height:1.9;margin-bottom:30px}
.lab-layout{display:grid;grid-template-columns:1.05fr 1fr;border:1px solid var(--lab-line)}
.lab-inputs{min-width:0;padding:30px 32px;margin:0}
.lab-pane-title{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:14px}
.lab-pane-title h3{font-family:var(--sans,sans-serif);font-size:13px;font-weight:500;line-height:1.6}
.lab-reset{border:0;background:transparent;font-size:11px;line-height:1.6;padding:8px 0 8px 8px;white-space:nowrap;min-height:38px;color:var(--ochre,#9f5432);text-decoration:underline;text-underline-offset:4px}
.lab-reset span{display:inline-block;margin-left:4px;text-decoration:none}
.lab-input-note{color:var(--lab-muted);font-size:11px;line-height:1.9;margin:0 0 19px}
.lab-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 24px}
.lab-field{min-width:0}
.lab-field label{display:flex;flex-wrap:wrap;justify-content:space-between;gap:3px 8px;font-size:12px;line-height:1.65;margin-bottom:8px}
.lab-field label span{font-size:10px;color:var(--lab-muted);white-space:nowrap}
.lab-field input{display:block;width:100%;min-width:0;padding:10px 12px;border:1px solid var(--lab-line);border-radius:0;background:#ffffff50;color:var(--ink,#173d3a);font-family:var(--mono,monospace);font-size:21px;line-height:1.4;min-height:49px;font-variant-numeric:tabular-nums}
.lab-field input:hover{border-color:#6d8278}
.lab-field input:focus-visible,.lab-reset:focus-visible,.lab-details summary:focus-visible{outline:2px solid var(--ochre,#9f5432);outline-offset:4px}
.lab-field input[aria-invalid=true]{border-color:var(--ochre,#9f5432);background:#9f543209}
.lab-realization-note{font-size:11px;color:var(--lab-muted);line-height:1.85;margin:18px 0 22px}
.lab-details{border-top:1px solid var(--lab-line)}
.lab-details summary{display:flex;align-items:center;justify-content:space-between;gap:24px;list-style:none;cursor:pointer;font-size:12px;font-weight:500;padding:17px 0;line-height:1.7;min-height:48px}
.lab-details summary::-webkit-details-marker{display:none}
.lab-details summary>span{font-size:18px;font-weight:400;flex-shrink:0;transition:transform .15s}
.lab-details[open] summary>span{transform:rotate(45deg)}
.lab-cost-details .lab-fields{padding:6px 0 20px}
.lab-cost-details>.lab-input-note{margin-bottom:0}
.lab-error,.lab-no-script{font-size:12px;line-height:1.85;color:var(--ochre,#9f5432);margin:18px 0 0;border-left:2px solid currentColor;padding-left:13px}
.lab-results{min-width:0;padding:31px 34px;background:#e7e9df;border-left:1px solid var(--lab-line);align-self:stretch}
.lab-live-label{font-family:var(--mono,monospace);font-size:9px;letter-spacing:1px;color:var(--lab-muted);white-space:nowrap}
.lab-contribution-pair{display:grid;grid-template-columns:minmax(0,1fr) 22px minmax(0,1fr);gap:12px;align-items:center;padding:25px 0 28px}
.lab-result-label{font-size:11px;display:block;line-height:1.7}
.lab-contribution-pair strong{font-family:var(--serif,Georgia,serif);font-size:clamp(28px,2.9vw,42px);font-weight:400;line-height:1.5;display:block;letter-spacing:-1px;overflow-wrap:anywhere;font-variant-numeric:lining-nums tabular-nums}
.lab-result-unit{display:block;font-size:9px;color:var(--lab-muted);margin-top:1px}
.lab-result-arrow{font-size:19px;color:var(--lab-muted);text-align:center}
.lab-after strong{color:var(--ochre,#9f5432)}
.lab-ledger{margin:0;border-top:1px solid var(--lab-line)}
.lab-ledger>div{display:flex;justify-content:space-between;gap:20px;align-items:baseline;padding:10px 0;border-bottom:1px solid var(--lab-line);font-size:12px;line-height:1.7}
.lab-ledger dt{font-weight:400}
.lab-ledger dd{margin:0;font-family:var(--mono,monospace);font-size:13px;text-align:right;overflow-wrap:anywhere;min-width:0;font-variant-numeric:tabular-nums}
.lab-ledger .lab-ledger-total{padding:13px 0;font-weight:500}
.lab-ledger-total dd{font-size:18px;color:var(--ochre,#9f5432)}
.lab-payback{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:22px 0 0}
.lab-payback p{margin:4px 0 0;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.lab-payback strong{font-family:var(--serif,Georgia,serif);font-size:43px;font-weight:400;line-height:1.35}
.lab-payback p>span{font-size:11px}
.lab-no-payback .lab-payback strong{font-size:30px;color:var(--ochre,#9f5432)}
.lab-investment{font-size:10px;color:var(--lab-muted);text-align:right;line-height:1.8;min-width:0}
.lab-investment b{display:block;color:var(--ink,#173d3a);font:13px var(--mono,monospace);margin-top:6px;overflow-wrap:anywhere}
.lab-result-note{font-size:11px;color:var(--lab-muted);line-height:1.9;margin:18px 0 0;max-width:440px}
.lab-negative{color:var(--ochre,#9f5432)!important}
.lab-invalid .lab-results{opacity:.75}
.lab-method{margin-top:18px}
.lab-method summary{font-size:12px}
.lab-method-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:55px;padding:10px 0 6px}
.lab-method h3{font-family:var(--sans,sans-serif);font-weight:500;font-size:12px;margin-bottom:13px}
.lab-method ol{margin:0;padding-left:18px}
.lab-method li,.lab-method p{font-size:11px;line-height:1.95;color:var(--lab-muted);margin:0 0 9px}
.lab-method li{padding-left:3px}
@media(max-width:1000px){.lab-layout{grid-template-columns:1fr 1fr}.lab-inputs,.lab-results{padding:25px}.lab-fields{gap:18px}.lab-sample-tag{font-size:9px;max-width:180px}.lab-contribution-pair{gap:8px}.lab-contribution-pair strong{font-size:32px}.lab-heading{gap:25px}.lab-method-grid{gap:35px}}
@media(max-width:760px){.lab-heading{display:block}.lab-sample-tag{display:inline-block;max-width:none;margin-top:18px}.lab-heading h2{font-size:29px}.lab-intro{font-size:13px;margin-bottom:24px}.lab-layout{grid-template-columns:1fr}.lab-results{border-left:0;border-top:1px solid var(--lab-line)}.lab-contribution-pair strong{font-size:40px}.lab-method-grid{grid-template-columns:1fr;gap:20px}.lab-fields{gap:20px 25px}.lab-payback{gap:20px}.lab-result-note{max-width:none}}
@media(max-width:420px){.lab-inputs,.lab-results{padding:22px 19px}.lab-pane-title{gap:12px}.lab-pane-title h3{font-size:12px}.lab-reset{font-size:10px}.lab-fields{gap:18px 16px}.lab-field label{font-size:11px;display:block;min-height:36px}.lab-field label span{display:block;font-size:9px}.lab-field input{font-size:20px;padding:9px 10px}.lab-contribution-pair{gap:8px;grid-template-columns:minmax(0,1fr) 16px minmax(0,1fr)}.lab-contribution-pair strong{font-size:31px;letter-spacing:-.6px}.lab-result-label{font-size:10px}.lab-live-label{font-size:8px}.lab-ledger>div{font-size:11px;gap:15px}.lab-payback strong{font-size:38px}.lab-no-payback .lab-payback strong{font-size:25px}.lab-investment{font-size:9px}.lab-investment b{font-size:12px}}
@media print{.lab-reset{display:none}.lab-layout{break-inside:avoid}.lab-results{background:transparent}}