.sim-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:35px 0 22px}.sim-heading .eyebrow{margin-bottom:13px}.sim-heading h1{font-size:43px;margin-bottom:9px}.sim-heading p{font-size:14px;margin:0}.sim-badge{display:flex;align-items:center;gap:8px;font-size:14px;color:#606b85}.sim-toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:15px 0}.sim-mode{display:flex;gap:3px;padding:4px;background:#e9edf9;border-radius:7px}.sim-mode button{background:transparent;border:0;border-radius:4px;padding:10px 22px;color:var(--body);font-size:14px}.sim-mode button[aria-pressed=true]{background:var(--green);color:white;box-shadow:0 2px 5px #15176310}.sim-actions,.chart-buttons{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.sim-actions button,.sim-actions a,.chart-buttons button,.chart-controls button,.sample-add button,.subtle-button{font:inherit;font-size:14px;color:var(--ink);border:1px solid #cfd5e6;background:#fff;border-radius:5px;padding:10px 13px;text-decoration:none;min-height:38px}.sim-actions a{background:transparent;border-color:transparent}.sim-status{font-size:14px;margin:13px 0;color:#626b84}.sim-error{background:#fff0e6;border-left:3px solid #b86031;color:#80391b;font-size:14px;line-height:1.6;padding:12px;margin:10px 0}.sim-workspace{display:grid;grid-template-columns:285px minmax(0,1fr);grid-template-areas:"controls chart" "controls sample";gap:22px;align-items:start}.sim-controls{grid-area:controls;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}.control-section{padding:21px;border-bottom:1px solid var(--line)}.control-section:last-child{border-bottom:0}.control-section h2{font-family:inherit;font-size:14px;font-weight:600;letter-spacing:-.1px;display:flex;gap:12px;margin-bottom:21px}.control-section h2 span{font-size:14px;color:#7b86a0;padding-top:3px}.control-section summary{font-size:14px;font-weight:500;line-height:1.5}.control-section[open]>summary{margin-bottom:18px}.field{display:block;font-size:14px;color:var(--ink);line-height:1.55;margin:15px 0 7px}.unit{font-weight:400;color:#535f80;margin-left:4px;font-size:14px}.field input,.field select,.range-control input[type=number],.sample-add select,.chart-controls select{border:1px solid #cbd2e5;background:#fcfcff;border-radius:5px;width:100%;padding:9px 10px;color:var(--ink);font:inherit;font-size:14px;min-height:39px;margin-top:6px}.field input:focus,.field select:focus{border-color:var(--green)}.field input[aria-invalid=true],.gradient-row input[aria-invalid=true]{border-color:#b86031;background:#fff5eb}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field-grid.thirds{grid-template-columns:repeat(3,1fr);gap:8px}.field-grid .field{min-width:0}.range-control{display:grid;grid-template-columns:minmax(0,1fr) 67px;gap:14px;align-items:center}.range-control input[type=range]{width:100%;accent-color:var(--green);height:24px;margin:0}.range-control input[type=number]{margin:0;padding:8px}.range-labels{display:flex;justify-content:space-between;color:#707b93;font-size:14px;margin:8px 0 19px}.field-note{font-size:14px!important;line-height:1.7;color:#606b85;margin:9px 0 0}.gradient-labels,.gradient-row{display:grid;grid-template-columns:1fr 1fr 28px;gap:7px;font-size:14px;align-items:center;margin-top:9px}.gradient-row input{width:100%;min-width:0;padding:8px 6px;border:1px solid #cbd2e5;border-radius:4px;font:inherit;font-size:14px;background:#fcfcff}.gradient-row button{border:0;background:none;font-size:19px;color:var(--body);min-height:38px}.subtle-button{margin-top:10px;background:#f8faff;font-size:14px}.check-field{font-size:14px;display:flex;gap:9px;align-items:center;margin:12px 0;line-height:1.5}.check-field input{accent-color:var(--green)}button:disabled{opacity:.45;cursor:not-allowed}input:disabled{opacity:.5}.sim-chart-panel{grid-area:chart;min-width:0;background:white;border:1px solid var(--line);border-radius:10px;padding:23px}.chart-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.chart-heading .eyebrow,.sample-heading .eyebrow{font-size:14px;letter-spacing:1.5px;margin:0 0 9px}.chart-heading h2,.sample-heading h2{font-size:26px;margin:0}.chart-buttons{gap:5px}.chart-buttons button{font-size:14px;padding:8px 10px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:19px 0;margin:22px 0 10px}.metrics>div{border-right:1px solid var(--line);padding-left:7px}.metrics>div:last-child{border:0}.metrics span,.metrics small{display:block;font-size:14px;color:#596582;line-height:1.6}.metrics strong{font-size:23px;font-weight:500;letter-spacing:-.7px;display:block;margin:4px 0}.plot-wrap{position:relative;margin:10px -7px 0}.plot-wrap canvas{width:100%;height:330px;display:block;touch-action:pan-y}.plot-tooltip{position:absolute;top:10px;left:50px;max-width:80%;pointer-events:none;background:#151763;color:white;padding:9px 13px;border-radius:5px;font-size:14px;white-space:pre-line;line-height:1.6}.chart-controls{display:flex;justify-content:space-between;gap:14px;align-items:center;margin:5px 0 15px}.chart-controls label{font-size:14px;display:flex;gap:10px;align-items:center}.chart-controls select{font-size:14px;width:auto;min-height:35px;max-width:220px;margin:0}.zoom-controls{display:flex;gap:5px}.chart-controls button{min-width:35px;padding:5px 9px;min-height:35px}.plot-legend{display:flex;gap:17px;flex-wrap:wrap;font-size:14px;color:#5b6585}.plot-legend i{display:inline-block;width:15px;height:2px;background:#202396;vertical-align:middle;margin-right:5px}.plot-legend .selected-line{background:#d32f2f}.plot-legend .reference-line{background:#9299ae}.plot-legend .overlay-line{background:#6c84ae}.chart-note{font-size:14px;margin:15px 0 0;line-height:1.6}.derived-details{border-top:1px solid var(--line);margin-top:18px;padding-top:13px}.derived-details summary{font-size:14px;font-weight:400}.derived-details dl{display:grid;grid-template-columns:1fr auto;gap:10px;margin:17px 0 0;font-size:14px;line-height:1.5}.derived-details dt{color:var(--body)}.derived-details dd{margin:0;text-align:right;font-variant-numeric:tabular-nums}.sim-sample{grid-area:sample;min-width:0;background:white;border:1px solid var(--line);border-radius:10px;padding:23px}.sample-heading{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}.sample-heading h2{font-size:24px}.sample-heading h2 span{font-family:"Segoe UI",sans-serif;font-size:14px;background:#edf0fa;border-radius:4px;padding:3px 7px;margin-left:4px;vertical-align:middle}.sample-add{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.sample-add label{flex:1;min-width:160px}.sample-add select{margin:0;height:100%;font-size:14px}.sample-add button{font-size:14px}.table-scroll{overflow-x:auto;max-width:100%}.sample-table{border-collapse:collapse;font-size:14px;width:100%;font-variant-numeric:tabular-nums;white-space:nowrap}.sample-table th{text-align:right;color:#5d6783;font-weight:500;font-size:14px;padding:11px 7px;background:#f0f3fb;border-bottom:1px solid var(--line)}.sample-table th:first-child{text-align:left;border-radius:4px 0 0 4px}.sample-table td{border-bottom:1px solid #e4e8f2;padding:9px 7px;text-align:right}.sample-table td:first-child{text-align:left;max-width:190px}.compound-select{font:inherit;border:0;background:transparent;color:var(--ink);padding:5px 0;text-align:left;cursor:pointer;max-width:190px;overflow:hidden;text-overflow:ellipsis}.compound-select[aria-pressed=true]{font-weight:600;color:#d32f2f}.compound-select[aria-pressed=true]:before{content:"●";font-size:14px;margin-right:5px}.sample-table input{width:67px;padding:6px;border:1px solid #d5dbeb;border-radius:4px;background:#fcfcff;color:var(--ink);font:inherit;text-align:right;min-height:33px}.remove-compound,.edit-compound{border:0;background:transparent;color:#68718a;font-size:17px;padding:5px;min-height:33px;min-width:27px}.edit-compound{font-size:14px}.sim-notes{margin:45px 0 55px;max-width:880px}.sim-notes h2{font-size:31px}.sim-notes>p{font-size:14px}.sim-notes .details p{font-size:14px}dialog{border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--ink);max-width:590px;width:calc(100% - 32px);padding:25px;max-height:90vh;overflow:auto}dialog::backdrop{background:#15173880}.dialog-heading{display:flex;justify-content:space-between;align-items:start;gap:20px}.dialog-heading h2{font-size:29px}.dialog-heading button{background:none;border:0;font-size:25px;color:var(--ink)}.coefficient-set{margin:22px 0;border:1px solid var(--line);border-radius:7px;padding:12px}.coefficient-set legend{font-size:14px;padding:0 8px}.coefficient-set .field{font-size:14px;margin-top:5px}#custom-form .button{margin-top:10px}.sim-actions button:hover,.chart-buttons button:hover,.subtle-button:hover,.sample-add button:hover{background:#eef1fc}
@media(min-width:1350px){body:has(#sim-app) .wrap{max-width:1380px}.sim-workspace{grid-template-columns:310px minmax(0,1fr)}.plot-wrap canvas{height:355px}}
@media(max-width:1100px){.sim-workspace{grid-template-columns:260px minmax(0,1fr);gap:16px}.control-section{padding:18px}.sim-chart-panel,.sim-sample{padding:18px}.metrics strong{font-size:20px}.chart-buttons{margin-top:3px}.sim-actions{gap:5px}.sim-actions button,.sim-actions a{padding:9px}.chart-controls{flex-wrap:wrap}}
@media(max-width:850px){.sim-workspace{grid-template-columns:minmax(0,1fr);grid-template-areas:"chart" "controls" "sample"}.sim-controls{display:grid;grid-template-columns:1fr 1fr;align-items:start}.sim-controls>.control-section:first-child{grid-row:span 2}.sim-heading{align-items:start;flex-direction:column;gap:12px;padding-top:28px}.sim-heading h1{font-size:37px}.sim-toolbar{align-items:start;flex-wrap:wrap}.sim-actions{flex:1;justify-content:flex-end}.plot-wrap canvas{height:300px}.metrics strong{font-size:24px}.chart-heading{flex-wrap:nowrap}.sim-chart-panel,.sim-sample{padding:22px}}
@media(max-width:550px){.sim-heading h1{font-size:34px}.sim-controls{display:block}.sim-toolbar{gap:10px}.sim-actions{justify-content:start;flex:1 0 100%}.sim-actions button,.sim-actions a{font-size:14px;min-height:40px}.sim-mode{width:100%}.sim-mode button{flex:1;min-height:40px}.sim-chart-panel,.sim-sample{padding:16px}.chart-heading{align-items:start;flex-direction:column}.chart-buttons{width:100%}.chart-buttons button{flex:1;padding:9px 5px;min-height:40px}.metrics{grid-template-columns:1fr 1fr;gap:15px;margin-top:17px}.metrics>div:nth-child(2){border:0}.metrics span,.metrics small{font-size:14px}.plot-wrap canvas{height:260px}.chart-controls{gap:10px}.chart-controls select{max-width:190px}.chart-controls button{min-width:40px;min-height:40px}.plot-legend{gap:10px}.sample-heading h2{font-size:22px}.sample-add{gap:6px}.sample-add label{flex-basis:100%}.sample-add button{flex:1;min-height:40px}.control-section{padding:20px}.sim-status{line-height:1.6}.sim-notes{margin-top:32px}.sim-notes h2{font-size:28px}.range-control{grid-template-columns:minmax(0,1fr) 80px}.field input,.field select,.range-control input[type=number],.sample-add select{font-size:16px;min-height:42px}.field{font-size:14px}.field-note{font-size:14px!important}.gradient-row input{font-size:16px}.sample-table{font-size:14px}.sample-table input{font-size:16px;width:76px}.coefficient-set .field input{font-size:14px}.sim-badge{font-size:14px}}
@media print{.header,.footer,.sim-controls,.sim-toolbar,.sim-actions,.chart-buttons,.sample-add,.sim-notes,.subtle-button,.remove-compound,.edit-compound{display:none!important}.sim-workspace{display:block}.sim-chart-panel,.sim-sample{break-inside:avoid;margin-bottom:20px}.table-scroll{overflow:visible}}

.table-scroll{position:relative}.sim-mobile-nav{display:none}#conditions,#chromatogram-heading,#sample-heading{scroll-margin-top:65px}
@media(max-width:850px){.sim-mobile-nav{display:flex;position:sticky;top:0;z-index:3;gap:5px;background:var(--paper);padding:8px 0;margin-bottom:14px;border-bottom:1px solid var(--line)}.sim-mobile-nav a{flex:1;text-align:center;padding:12px 4px;background:#edf0fa;border-radius:4px;font-size:14px;text-decoration:none}}

/* Clear section hierarchy and readable working text. */
.sim-heading{padding:25px 0 18px}.sim-heading h1{margin:0}
.sim-workspace{grid-template-columns:330px minmax(0,1fr)}
.control-section{padding:20px}
.control-section h2{background:#151763;color:#fff;margin:-20px -20px 20px;padding:15px 20px;font-size:18px;line-height:1.4;align-items:center;gap:12px}
.control-section h2 span{color:#d9ddff;font-size:14px;padding:0;font-weight:500}
.sim-chart-panel,.sim-sample{--panel-padding:22px;padding:var(--panel-padding);overflow:hidden}
.chart-heading,.sample-heading{background:#151763;color:#fff;margin:calc(-1 * var(--panel-padding)) calc(-1 * var(--panel-padding)) 20px;padding:14px var(--panel-padding);gap:14px;flex-wrap:wrap}
.chart-heading h2,.sample-heading h2{font-family:inherit;font-size:20px;font-weight:600;letter-spacing:-.3px;line-height:1.4}
.chart-heading .section-number,.sample-heading h2 .section-number{font-family:inherit;font-size:14px;color:#d9ddff;font-weight:500;background:none;padding:0;margin:0 10px 0 0;vertical-align:baseline}
.sample-heading h2 #compound-count{font-size:14px;color:#fff;background:#ffffff26;padding:3px 7px}
.chart-buttons button,.sample-heading>.subtle-button{background:#ffffff12;color:#fff;border-color:#898dd0;font-size:14px;margin:0;min-height:40px}
.chart-buttons button:hover,.sample-heading>.subtle-button:hover{background:#ffffff26}
.field,.control-section summary,.check-field,.chart-controls label,.derived-details summary{font-size:15px}
.field input,.field select,.range-control input[type=number],.sample-add select,.chart-controls select,.gradient-row input,.sample-table input{font-size:16px;min-height:42px}
.range-control{grid-template-columns:minmax(0,1fr) 82px}
.metrics{margin-top:0;border-top:0}.metrics strong{font-size:27px}
.metrics span,.metrics small{font-size:14px}.metrics>div{padding-left:5px}
.sample-table{font-size:15px}.sample-table th{font-size:14px}.sample-table input{width:82px}
.compound-select[aria-pressed=true]:before{font-size:8px}
.chart-controls select{max-width:270px}.chart-controls{flex-wrap:wrap}
.sim-notes{margin-top:30px}.sim-notes .details summary{font-size:16px}.sim-notes .details p{font-size:15px}
.plot-wrap canvas{height:355px}
@media(max-width:1150px){.sim-workspace{grid-template-columns:305px minmax(0,1fr)}.metrics{grid-template-columns:1fr 1fr;gap:16px}.metrics>div:nth-child(2){border:0}}
@media(max-width:950px){.sim-workspace{grid-template-columns:minmax(0,1fr);grid-template-areas:"chart" "controls" "sample"}.sim-controls{display:grid;grid-template-columns:1fr 1fr;align-items:start}.sim-controls>.control-section:first-child{grid-row:span 2}}
@media(max-width:550px){.sim-controls{display:block}.sim-chart-panel,.sim-sample{--panel-padding:16px}.chart-heading,.sample-heading{align-items:stretch;flex-direction:column}.chart-heading h2,.sample-heading h2{font-size:18px}.chart-buttons{flex-wrap:wrap}.chart-buttons button{flex:1 1 auto;font-size:14px;padding:8px}.sample-heading>.subtle-button{align-self:start}.chart-controls label{flex-wrap:wrap}.chart-controls select{font-size:15px;max-width:100%}.metrics strong{font-size:25px}.plot-wrap canvas{height:290px}.sim-badge{font-size:14px}.sim-toolbar .sim-actions{gap:7px}.sim-actions button,.sim-actions a{font-size:14px}.sim-notes .details p{font-size:15px}}

/* Shared typography for all four numbered section headers at every screen size. */
.control-section h2,.chart-heading h2,.sample-heading h2{font-family:inherit;font-size:20px;font-weight:600;letter-spacing:-.3px;line-height:1.4}

.control-section .sim-mode{display:flex;width:100%;margin-bottom:20px}.control-section .sim-mode button{flex:1;min-width:0;min-height:42px}.sim-toolbar{justify-content:flex-end}

/* Supporting results stay compact beneath the plot. */
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px 20px;margin:16px 0 0;padding:14px 0 0;border-top:1px solid var(--line)}.metrics>div{display:flex;flex-wrap:wrap;align-content:start;align-items:baseline;gap:2px 8px;padding:0;border:0}.metrics span{font-size:14px}.metrics strong{font-size:16px;font-weight:600;line-height:1.4;margin:0}.metrics small{flex-basis:100%;font-size:14px;line-height:1.4}.metrics+.derived-details{margin-top:14px}
@media(max-width:1150px){.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}}
.metrics{border-bottom:0}

.plot-cursor{position:absolute;width:1px;background:rgba(140,140,140,.45);pointer-events:none}.plot-cursor[hidden]{display:none}#chromatogram{cursor:grab}#chromatogram.is-panning{cursor:grabbing}
.plot-slot{display:flow-root;min-width:0;overflow:visible}
@media(max-width:550px){
  .plot-wrap.is-mobile-docked{position:fixed;top:0;left:0;right:0;margin:0;padding:6px 8px 12px;background:#fff;border-bottom:1px solid #cbd2e5;box-shadow:0 4px 14px #15176320;z-index:60}
  .plot-wrap.is-mobile-docked canvas{height:clamp(160px,27vh,230px)}
  .sim-controls,.sim-sample,html.mobile-plot-docked :is(input,select,button,summary){scroll-margin-top:calc(clamp(160px,27vh,230px) + 30px)}
}
@media print{.plot-slot{height:auto!important}.plot-wrap.is-mobile-docked{position:relative!important;box-shadow:none}}
/* Contextual help stays small beside labels; the popover uses the browser top layer. */
#sim-app .help-button,#custom-form .help-button{display:inline-flex;align-items:center;justify-content:center;vertical-align:middle;flex:0 0 24px;width:24px;min-width:24px;height:24px;min-height:24px;padding:0;margin:0 0 0 5px;border:1px solid #9aa3bd;border-radius:50%;background:transparent;color:#596582;font:600 14px/1 "Segoe UI",sans-serif;cursor:pointer}
#sim-app .help-button:hover,#custom-form .help-button:hover{background:#e8ecf8;color:#151763}
.help-button:focus-visible{outline:2px solid #202396;outline-offset:2px}
.help-pair{display:inline-flex;align-items:center;gap:0;min-width:0}
.sim-mode>.help-pair{flex:1}.sim-mode>.help-pair>[data-mode]{padding:10px 8px;flex:1}.sim-mode>.help-pair>.help-button{margin-right:4px}
.field>.help-button{margin-bottom:3px!important}.chart-heading .help-button,.sample-heading .help-button{color:white!important;border-color:#aab0d7!important}
.metrics .help-button{flex-basis:24px!important}.gradient-labels{align-items:center}.gradient-labels .help-button{margin-left:auto!important}
.control-help{position:fixed;inset:auto;margin:0;width:min(360px,calc(100vw - 24px));max-height:min(420px,calc(100dvh - 24px));box-sizing:border-box;overflow:auto;padding:18px;border:1px solid #b9c2da;border-radius:10px;background:#fff;color:#303951;box-shadow:0 8px 30px #15176330;font:15px/1.6 "Segoe UI",sans-serif}
.help-heading{display:flex;align-items:start;justify-content:space-between;gap:16px;color:#151763}.help-heading strong{font-size:17px}.help-close{flex-shrink:0;background:transparent;border:0;color:#596582;font-size:24px;line-height:1;width:28px;height:28px;cursor:pointer}.control-help p{margin:12px 0 0;font-size:15px;line-height:1.6}
@media print{.help-button,.control-help{display:none!important}}
.metrics .metric-value{display:inline-flex;align-items:baseline;gap:5px;white-space:nowrap}.metrics .metric-value small{flex-basis:auto}
.sim-notes .model-equation{padding:12px 16px;background:#eef1fa;border-radius:5px;line-height:1.9;overflow-x:auto;font-size:16px}.model-equation sub,.model-equation sup{line-height:0}
.display-options{display:flex;flex-wrap:wrap;gap:10px 22px;margin:12px 0}.display-option{display:inline-flex;align-items:center;gap:7px;font-size:14px;white-space:nowrap;cursor:pointer}.display-option input{width:16px;height:16px;accent-color:#202396}.sim-toolbar>.display-option{margin-right:auto}.hide-control-help .help-button{display:none!important}.resolution-select{font:inherit;color:#202396;border:0;border-bottom:1px dotted #7b85ad;background:transparent;padding:5px;cursor:pointer}.resolution-select:hover,.resolution-select:focus-visible{background:#e8ecf8}.sample-table tr.resolution-pair{background:#f2edfa}.plot-legend .comparison-line{background:#8550b4}
#time-details .check-field{align-items:flex-start;line-height:1.5}.sampling-warning{border-left:3px solid #b67425;background:#fff4df;padding:12px 16px;color:#714412;font-size:15px}