:root {
  --ground:#f4f1ec; --paper:#fffdf9; --ink:#27231f; --muted:#655d55;
  --line:#e4ddd2; --control-edge:#a2998e; --accent:#0d6656; --accent-hover:#084d41; --on-accent:#fffdf9;
  --select-bg:#e5dfd5; --select-bg-quiet:#eeebe5; --select-edge:#27231f;
  --notice-ink:#77501b; --notice-bg:#faf0dc; --notice-line:#c4a465;
  --danger:#9a302b; --danger-bg:#fff0ec; --danger-line:#cf9c92;
  --ok:#326444; --ok-bg:#eaf0e8; --ok-line:#a2b59e;
  --backdrop:#27231f66; --qr-dark:#27231f; --qr-light:#ffffff;
  /* Scientific composition keys; swatches are always paired with lipid names. */
  --lipid-1:#897d70; --lipid-2:#b89142; --lipid-3:#7d9aa9; --lipid-4:#8e9b70;
  --lipid-5:#a18cac; --lipid-6:#b17f8c; --lipid-7:#b58a70; --lipid-8:#7d9996;
  --page-width:1440px; --reading-width:760px; --gutter:24px;
  --radius:6px; --radius-control:5px; --radius-sm:4px;
  --font:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --serif:Charter,'Iowan Old Style','Sitka Text',Cambria,Georgia,serif;
}
*{box-sizing:border-box}html{color-scheme:light}body{margin:0;background:var(--ground);color:var(--ink);font:14px/1.5 var(--font)}button,input,select,textarea{font:inherit}button,a,summary{cursor:pointer}a{color:var(--accent);text-underline-offset:3px}button{transition:background .16s,color .16s,border-color .16s}button:disabled{cursor:not-allowed;opacity:.55}
input,select,textarea{width:100%;min-width:0;min-height:36px;padding:6px 9px;border:1px solid var(--control-edge);border-radius:var(--radius-control);background:var(--paper);color:var(--ink)}input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}textarea{resize:vertical}input[type=number]{appearance:textfield;-moz-appearance:textfield;font-variant-numeric:tabular-nums}input::-webkit-inner-spin-button,input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}input[type=checkbox]{width:18px;height:18px;min-height:0;accent-color:var(--select-edge);cursor:pointer;flex-shrink:0}
button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:3px}[tabindex='-1']:focus{outline:none}::selection{background:var(--select-bg);color:var(--ink)}
.site-header{background:var(--paper);border-bottom:1px solid var(--line)}.header-frame{max-width:calc(var(--page-width) + var(--gutter)*2);margin:auto;padding:0 var(--gutter);height:53px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;gap:8px;color:var(--ink);text-decoration:none;white-space:nowrap;font-size:17px;font-weight:650}.brand svg{width:27px;height:27px;fill:currentColor}.brand svg path{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}.brand-light{font-weight:400;margin-left:3px}.workspace-nav{display:flex;align-items:center;gap:5px;flex:1;min-width:0;height:100%;overflow-x:auto}.workspace-nav a{text-decoration:none;color:var(--muted);display:inline-flex;gap:7px;align-items:center;flex-shrink:0;min-height:36px;padding:6px 10px;font-size:13px;border:1px solid transparent;border-radius:var(--radius-control);white-space:nowrap}.workspace-nav a:hover{background:var(--select-bg-quiet);color:var(--ink)}.workspace-nav a.active{background:var(--select-bg);color:var(--ink);border-color:var(--select-edge)}/* Reference material, not a workspace tab: a quiet link rather than a pill. */.workspace-nav .method-link{margin-left:auto;color:var(--accent);text-decoration:underline;text-underline-offset:3px}.workspace-nav .method-link:hover,.workspace-nav .method-link.active{background:transparent;border-color:transparent;color:var(--accent-hover)}.workspace-nav .method-link.active{font-weight:600}.workspace-nav .saved-link{border-left:1px solid var(--line);border-radius:0;padding-left:16px}.workspace-nav .saved-link.active{border-radius:var(--radius-control);border-color:var(--select-edge)}.count{font-variant-numeric:tabular-nums;color:var(--muted)}.local-dot{display:inline-block;width:6px;height:6px;background:var(--ok);border-radius:50%;flex-shrink:0}
.storage-banner{max-width:calc(var(--page-width) + var(--gutter)*2);margin:0 auto}.storage-banner:empty{display:none}.storage-banner.has-error{padding:10px var(--gutter);background:var(--danger-bg);color:var(--danger);border-bottom:1px solid var(--danger-line);font-size:13px}.storage-banner button{color:inherit;text-decoration:underline}.app-shell{margin:0}
.page{width:100%;max-width:calc(var(--page-width) + var(--gutter)*2);margin:auto;padding:24px var(--gutter) 12px}.page-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:20px}h1{font-family:var(--serif);font-size:1.8rem;font-weight:500;line-height:1.25;margin:0}h2{font-size:1.25rem;line-height:1.35;font-weight:600;margin:0}h3{font-size:1rem;line-height:1.4;font-weight:600;margin:0}.eyebrow{font-size:10px;letter-spacing:1.3px;font-weight:600;color:var(--muted);margin:0 0 6px}.subtitle{font-size:13px;color:var(--muted);margin:7px 0 0}
.button{display:inline-flex;align-items:center;justify-content:center;gap:7px;text-decoration:none;min-height:36px;padding:7px 12px;border:1px solid var(--control-edge);border-radius:var(--radius-control);font-size:13px;font-weight:550;line-height:1.4;background:var(--paper);color:var(--ink)}.button:hover{background:var(--select-bg-quiet)}.button.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}.button.primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.button.danger{color:var(--danger);border-color:var(--danger-line);background:var(--danger-bg)}.button.danger:hover{background:var(--danger);border-color:var(--danger);color:var(--on-accent)}.button-group{display:flex;gap:8px;flex-wrap:wrap}.text-button{border:0;background:transparent;color:var(--accent);text-decoration:underline;text-underline-offset:3px;min-height:36px;padding:6px 0;font-size:13px}.text-button:hover{color:var(--accent-hover)}
.workspace-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(330px,1fr);gap:20px;align-items:start}.editor,.results-column{min-width:0}.card,.result-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper)}.setup{padding:16px}.section-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:16px}.small{font-size:12px}.muted{color:var(--muted)}.field{display:block;font-size:13px;font-weight:500;color:var(--ink)}.field input,.field textarea,.field select{margin-top:5px;display:block;font-size:14px;font-weight:400}.setup-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 20px}.input-unit{position:relative}.input-unit input{padding-right:85px}.input-unit>span{position:absolute;right:10px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:12px;pointer-events:none}.input-note{color:var(--muted);font-size:12px;margin:12px 0 0}.composition{margin-top:20px;padding-top:16px;overflow:hidden}.composition .section-heading{margin:0 16px 12px}.section-description{font-size:13px;color:var(--muted);margin:0 16px 12px}.pill{font-size:12px;color:var(--muted);font-weight:400}
.tag{font-size:12px;border:1px solid var(--line);padding:2px 7px;border-radius:var(--radius-sm);color:var(--muted);background:var(--select-bg-quiet)}.tag-ok{color:var(--ok);background:var(--ok-bg);border-color:var(--ok-line)}.tag-warn{color:var(--notice-ink);background:var(--notice-bg);border-color:var(--notice-line)}.tag-danger{color:var(--danger);background:var(--danger-bg);border-color:var(--danger-line)}
.table-scroll{overflow-x:auto;max-width:100%;position:relative}table{width:100%;border-collapse:collapse;text-align:left;font-variant-numeric:tabular-nums}th,td{padding:8px 10px}th{font-size:12px;color:var(--muted);font-weight:550;background:var(--select-bg-quiet);border-block:1px solid var(--line);white-space:nowrap}td{border-bottom:1px solid var(--line);font-size:13px}.composition{container-type:inline-size}.input-table{table-layout:fixed}.input-table th:nth-child(1){width:27%}.input-table th:nth-child(2){width:14%}.input-table th:nth-child(3){width:29%}.input-table th:nth-child(4){width:25%}.input-table th:last-child{width:5%}.input-table td{vertical-align:top}.input-table input{font-size:13px;padding:6px}.lipid-name{display:flex;align-items:center;gap:6px}.lipid-name input{font-weight:550;min-width:0}.lipid-dot{display:inline-block;width:7px;height:7px;border-radius:50%;flex-shrink:0}.stock-input{display:flex;align-items:center;border:1px solid var(--control-edge);border-radius:var(--radius-control);background:var(--paper);min-height:36px}.stock-input input{flex:1;width:55%;min-width:0;border:0;margin:0;background:transparent}.stock-input select{width:65px;flex-shrink:0;font-size:12px;border:0;margin:0;padding:6px 2px;background:transparent}.remove-lipid{display:inline-grid;place-items:center;width:28px;height:28px;min-height:0;margin-top:4px;border:0;border-radius:6px;background:transparent;color:var(--muted);font-size:18px;line-height:1;padding:0}.remove-lipid:hover:not(:disabled){color:var(--danger);background:var(--select-bg-quiet)}.composition>.text-button{margin:4px 16px}.composition-bar{display:flex;height:6px;gap:2px;margin:6px 16px 0;border-radius:var(--radius-sm);overflow:hidden}.composition-bar>span{min-width:2px}.composition-legend{display:flex;gap:6px 14px;flex-wrap:wrap;margin:10px 16px 16px;font-size:12px;color:var(--muted)}.composition-legend .lipid-dot{margin-right:5px}
.details-card{margin-top:20px}.details-card summary{padding:12px 16px;display:flex;align-items:center;justify-content:space-between;font-size:14px;list-style:none}.details-card summary::-webkit-details-marker{display:none}.details-card[open] summary{border-bottom:1px solid var(--line)}.details-card[open] summary>span{transform:rotate(45deg)}.detail-fields{display:grid;grid-template-columns:1fr 2fr;gap:20px;padding:16px}.save-strip{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-top:12px}.save-strip p{color:var(--muted);font-size:12px;margin:0}
.result-card{padding:16px}.result-header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:12px;gap:12px}.result-header h2{margin:0}.result-hero{padding:16px 0}.result-hero-label{font-size:13px;color:var(--muted)}.result-hero>div{display:flex;align-items:baseline;gap:8px;margin-top:3px}.result-hero strong{font-size:32px;font-weight:550;line-height:1.25;font-variant-numeric:tabular-nums}.result-hero>div>span{font-size:15px;color:var(--muted)}.result-hero p{font-size:12px;color:var(--muted);margin:5px 0 0}.result-metrics{display:grid;grid-template-columns:1fr 1fr;gap:12px}.result-metrics>div{border-left:1px solid var(--line);padding-left:10px}.result-metrics span{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}.result-metrics strong{font-size:14px;font-weight:550;font-variant-numeric:tabular-nums}.result-divider{height:1px;background:var(--line);margin:16px 0}.pipetting-title{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:4px}.pipetting-title>span{font-size:12px;color:var(--muted)}.pipetting-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}.pipetting-row>span{display:flex;align-items:center;gap:8px;overflow-wrap:anywhere;min-width:0}.pipetting-row strong{font-size:15px;font-weight:550;font-variant-numeric:tabular-nums;white-space:nowrap}.tiny-flag{color:var(--notice-ink);margin-left:5px}.ethanol-row{display:flex;justify-content:space-between;gap:12px;margin-top:12px;padding:10px;background:var(--select-bg-quiet);border:1px solid var(--line);border-radius:var(--radius-sm);font-size:14px}.ethanol-row strong{font-variant-numeric:tabular-nums;font-weight:550}.solvent-dot{display:inline-block;width:7px;height:7px;border:1px solid var(--muted);border-radius:50%;margin-right:7px}.result-total{display:flex;justify-content:space-between;font-size:14px;padding:12px 0}.result-total strong{font-variant-numeric:tabular-nums;font-weight:600}.export-button{width:100%}.export-button>span{font-size:12px;color:var(--muted);margin-left:auto}.print-button{width:100%;border:0;background:transparent;color:var(--accent);min-height:36px;padding:6px;font-size:13px;text-decoration:underline;text-underline-offset:3px}.precision-note{font-size:12px;color:var(--muted);margin:6px 0 0}
.messages{display:grid;gap:10px;margin-top:12px}.messages:empty{display:none}.message{font-size:13px;padding:12px;border:1px solid var(--notice-line);border-radius:var(--radius);background:var(--notice-bg);color:var(--notice-ink);overflow-wrap:anywhere}.message strong{display:block;margin-bottom:4px;font-weight:600}.message.error{border-color:var(--danger-line);background:var(--danger-bg);color:var(--danger)}.result-footnote{padding:12px 0;color:var(--muted)}.result-footnote p{margin:0;font-size:12px}.amounts-card{margin-top:20px;padding-top:16px;overflow:hidden}.amounts-card .section-heading{margin:0 16px 12px}.amounts-table{min-width:480px}.amounts-table td:not(:first-child),.amounts-table th:not(:first-child){text-align:right}.amounts-table .lipid-dot{margin-right:8px}
footer{max-width:calc(var(--page-width) + var(--gutter)*2);margin:auto;padding:20px var(--gutter);color:var(--muted);font-size:12px;display:flex;justify-content:space-between;align-items:center;gap:12px}.offline-status{font-size:12px;color:var(--muted)}.prose-page{display:grid;grid-template-columns:240px minmax(0,var(--reading-width));gap:0 32px;justify-content:center}.prose-page>.eyebrow,.prose-page>h1,.prose-page>.subtitle,.prose-page>.prose{grid-column:2}.prose-page>.subtitle{margin-bottom:20px}.reading-toc{grid-column:1;grid-row:1 / span 5;align-self:start;position:sticky;top:24px;padding:4px 0}.reading-toc strong{font-size:10px;letter-spacing:1.3px;color:var(--muted);text-transform:uppercase}.reading-toc a{display:block;color:var(--muted);text-decoration:none;padding:7px 0;font-size:13px}.reading-toc a:hover{color:var(--accent);text-decoration:underline}.prose{padding:20px}.prose h2{margin:28px 0 12px;scroll-margin-top:20px}.prose h2:first-child{margin-top:0}.prose p{font-size:14px;line-height:1.8;margin:0 0 16px}.prose .formula{font:13px/1.7 Consolas,monospace;padding:12px;background:var(--select-bg-quiet);border:1px solid var(--line);border-radius:var(--radius-sm);overflow-wrap:anywhere}body[data-view=method] footer{max-width:calc(1032px + var(--gutter)*2);padding-left:calc(var(--gutter) + 272px)}
.storage-note{font-size:13px;color:var(--muted);margin:12px 0 20px}.danger-strip{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:20px;padding:14px 16px;border:1px solid var(--danger-line);border-radius:var(--radius);background:var(--danger-bg)}.danger-strip strong{display:block;font-size:14px;font-weight:600;color:var(--danger)}.danger-strip p{margin:4px 0 0;font-size:12px;color:var(--muted);max-width:52ch}.danger-strip .button{flex-shrink:0;background:var(--paper)}.saved-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}.saved-card{padding:16px;min-width:0}.saved-card h2{overflow-wrap:anywhere;padding-bottom:12px;border-bottom:1px solid var(--line)}.saved-card p{font-size:13px;color:var(--muted);overflow-wrap:anywhere}.saved-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.saved-actions .delete-recipe{color:var(--danger)}.empty-state{padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);grid-column:1 / -1}.empty-state p{font-size:14px;color:var(--muted)}.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);max-width:min(90vw,600px);z-index:20;background:var(--ink);color:var(--paper);border:1px solid var(--ink);border-radius:var(--radius);padding:12px 16px;font-size:14px}.toast-action{margin-left:12px;min-height:0;padding:2px 4px;border:0;background:transparent;color:inherit;font:inherit;font-weight:650;text-decoration:underline;text-underline-offset:3px;cursor:pointer}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}
html{scrollbar-gutter:stable}.table-scroll:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.workspace-nav{overflow-y:hidden;scrollbar-width:none}.workspace-nav::-webkit-scrollbar{display:none}.toc-link{display:block;width:100%;text-align:left;border:0;background:transparent;color:var(--muted);padding:7px 0;font-size:13px;line-height:1.5}.toc-link:hover{color:var(--accent);text-decoration:underline;text-underline-offset:3px}.skip-link:focus{position:absolute;top:6px;left:var(--gutter);z-index:30;width:auto;height:auto;margin:0;clip:auto;padding:8px 12px;background:var(--paper);color:var(--ink);border:1px solid var(--select-edge);border-radius:var(--radius-control)}
@media(max-width:1100px){.header-frame{gap:18px}.workspace-nav{gap:2px}.workspace-nav a{padding-inline:7px;font-size:12px}}
@media(max-width:900px){.workspace-grid{grid-template-columns:1fr}.header-frame{gap:14px}.prose-page{grid-template-columns:1fr}.prose-page>.eyebrow,.prose-page>h1,.prose-page>.subtitle,.prose-page>.prose{grid-column:1}.reading-toc{grid-column:1;grid-row:4;position:static;margin:0 0 20px;border-bottom:1px solid var(--line);padding-bottom:12px}.reading-toc a{display:inline-block;margin-right:16px}body[data-view=method] footer{max-width:calc(var(--page-width) + var(--gutter)*2);padding-left:var(--gutter)}}
@media(max-width:600px){:root{--gutter:16px}.header-frame{gap:12px}.brand{font-size:15px;gap:5px}.brand svg{width:23px;height:23px}.workspace-nav a{min-height:40px;font-size:13px}.page{padding-top:20px}.page-heading{flex-wrap:wrap;gap:12px}.page-heading .button-group{width:100%}.setup-grid{gap:12px}input,select,textarea,.field input,.field select,.field textarea,.input-table input{font-size:16px}input,select,.button,.stock-input{min-height:40px}.field{font-size:12px}.input-unit>span{font-size:11px;right:7px}.input-unit input{padding-right:67px}.section-heading{align-items:flex-start}.section-heading>.small{max-width:130px;text-align:right}.save-strip p{max-width:190px}.detail-fields{grid-template-columns:1fr}.saved-list{grid-template-columns:minmax(0,1fr)}.prose{padding:16px}footer{align-items:flex-start;flex-direction:column;gap:5px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{body{background:var(--paper);font-size:12px}.site-header,.storage-banner,.page-heading>.button,.save-strip,.details-card,.export-button,.print-button,footer,.toast,.remove-lipid,.text-button,.reading-toc{display:none!important}.page{padding:0;max-width:none;display:block}.workspace-grid,.results-column{display:block}.editor{margin-bottom:16px}.result-card,.card,.message{break-inside:avoid;margin-bottom:12px}.result-card{color:var(--ink)}.result-hero{padding:10px 0}.result-hero strong{font-size:26px}.result-divider{margin-block:10px}.pipetting-row{padding-block:6px}.input-table{min-width:0}.page-heading{margin-bottom:16px}input,select,textarea{border:0!important;min-height:0;padding:3px!important}th{background:var(--paper)}}