/* LM2LM project page.
   Tokens first: two text colours, one accent, two radii, three font stacks.
   Everything below uses these; add a new value here before using it. */

:root{
  --bg:#f7f7f4;
  --surface:#fff;
  --ink:#1a211e;
  --muted:#5a655f;
  --line:#dcdfd8;
  --accent:#5863d8;       /* fills: LM2LM bars, selected states */
  --accent-text:#414dc0;  /* links and accented numbers */
  --bar:#848f88;          /* baseline bars */
  --track:#e9ebe6;        /* bar lanes and grid lines */
  --radius:6px;
  --radius-sm:3px;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --serif:Charter,"Bitstream Charter","Sitka Text",Cambria,Georgia,serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --measure:38rem;
  /* results chart geometry; app.js reads --row */
  --row:40px;
  --label:200px;
  --score:70px;
}

/* Base */

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%}
h1,h2,h3,h4,p,figure,dl,dd,ol,ul,pre{margin:0}
h1,h2{font-family:var(--serif);font-weight:400;letter-spacing:-.012em;text-wrap:balance}
h1{font-size:clamp(34px,5vw,58px);line-height:1.08}
h2{font-size:clamp(25px,2.9vw,32px);line-height:1.22}
h3{font-size:17px;font-weight:650;line-height:1.35}
strong{font-weight:650}
sup{font-size:.68em;line-height:0;margin-left:1px}
a{color:var(--accent-text);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:color-mix(in srgb,currentColor 40%,transparent)}
a:hover{text-decoration-color:currentColor}
button{font:inherit;color:inherit;cursor:pointer}
button,a{-webkit-tap-highlight-color:transparent}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
figcaption,.note{font-size:14.5px;line-height:1.55;color:var(--muted)}

.wrap{max-width:1160px;margin-inline:auto;padding-inline:40px}
.skip-link{position:absolute;left:10px;top:-60px;padding:12px;background:var(--surface);z-index:10}
.skip-link:focus{top:10px}

/* Header */

.site-header{display:flex;justify-content:space-between;align-items:center;gap:24px;height:64px;border-bottom:1px solid var(--line)}
.wordmark{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:650;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.wordmark svg{width:26px;height:26px;stroke:var(--accent);stroke-width:1.8;fill:none;overflow:visible}
.site-header nav{display:flex;align-items:center;gap:26px;font-size:15px}
.site-header nav a{color:var(--ink);text-decoration:none}
.site-header nav a:hover{color:var(--accent-text)}
.site-header nav .nav-lab{color:var(--muted)}
.paper-button{border:1px solid var(--line);border-radius:var(--radius);padding:6px 14px;background:var(--surface)}

/* Title block */

.hero{padding-top:64px;padding-bottom:44px}
.hero h1{max-width:17em;margin-bottom:28px}
.authors{font-size:17px;line-height:1.7;max-width:52rem}
.authors a{color:var(--ink);text-decoration-color:var(--line)}
.authors a:hover{color:var(--accent-text)}
.affiliations{display:flex;flex-wrap:wrap;gap:2px 20px;margin-top:8px;font-size:15px;color:var(--muted)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,480px);gap:28px 64px;align-items:start;margin-top:36px}
.lede{font-size:20px;line-height:1.55;max-width:40rem}

/* Headline numbers, beside the summary */
.key-results figcaption{margin-bottom:10px}
.key-results table{font-size:15.5px}
.key-results th,.key-results td{padding:10px}
.key-results th{line-height:1.3}
.key-results tbody th{white-space:normal}
.key-results thead th{vertical-align:top}
.key-results small{display:block;margin-top:2px;font-size:13px;font-weight:400;color:var(--muted)}
.key-results .ours{color:var(--accent-text);font-weight:650}
.key-results .note{margin-top:10px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}

.button{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--ink);padding:8px 16px;font-size:15px;font-weight:500;line-height:1.5;text-decoration:none}
.button:hover{border-color:var(--ink)}
.button.primary{background:var(--ink);border-color:var(--ink);color:#fff}
.button.primary:hover{background:#34403a}

.film{padding-bottom:64px}
.film-intro{max-width:46rem;margin-bottom:20px}
.film-frame{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--bg)}
.film-frame video{width:100%;aspect-ratio:16/9}
.film figcaption{margin-top:12px}

/* Sections: a label in the left rail, content in a readable column */

.section{display:grid;grid-template-columns:150px minmax(0,1fr);column-gap:56px;padding-block:64px;border-top:1px solid var(--line)}
.rail{position:sticky;top:24px;align-self:start;padding-top:9px;font-size:15px;font-weight:650;line-height:1.4}
.content{min-width:0}
.content>*+*{margin-top:20px}
.content>p,.content>h3,.content>ol,.content>ul,.content>dl{max-width:var(--measure)}
.content>h2{max-width:48rem}
.content>h3{margin-top:40px}
.content>h3+p{margin-top:8px}
.content>.note{margin-top:14px}
.content>figure,.content>.table-scroll{margin-top:32px}
.nowrap{white-space:nowrap}

.steps,.findings{padding-left:1.3em;display:grid;gap:10px}
.steps li{padding-left:4px}
.steps li::marker,.findings li::marker{color:var(--muted)}

/* Secondary evidence, folded away until asked for */

.more{border-block:1px solid var(--line)}
.content>.more{margin-top:28px}
.more summary{padding-block:12px;font-size:15.5px;font-weight:500;cursor:pointer}
.more summary:hover{color:var(--accent-text)}
.more>figure{margin-block:10px 24px}

/* Method figure */

.method-figure img{width:100%;height:auto;border:1px solid var(--line);border-radius:var(--radius)}
.method-figure figcaption{margin-top:12px}
.diagram-scroll{overflow-x:auto;overscroll-behavior-inline:contain}
.scroll-hint{display:none;font-size:14.5px;color:var(--muted);margin-bottom:8px}

/* Results chart */

.benchmark{border-top:1px solid var(--ink);padding-top:20px}
.benchmark-top{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px 24px}
.controls{display:flex;flex-wrap:wrap;gap:10px}
.segmented{display:inline-flex;border:1px solid var(--line);border-radius:var(--radius);padding:2px;background:var(--surface)}
.segmented button{border:0;background:transparent;border-radius:var(--radius-sm);padding:6px 12px;font-size:14px;line-height:1.4;color:var(--muted)}
.segmented button:not(.active):hover{color:var(--ink)}
.segmented button.active{background:var(--ink);color:#fff}

.chart-head{display:grid;grid-template-columns:var(--label) 1fr var(--score);margin-top:24px;padding-bottom:10px;border-bottom:1px solid var(--line);font-size:13.5px;line-height:1.4;color:var(--muted)}
.results-chart{position:relative;height:calc(var(--row)*7);margin-top:6px}
.chart-grid{position:absolute;left:var(--label);right:var(--score);top:0;bottom:0;pointer-events:none}
.chart-grid i{position:absolute;top:0;bottom:0;border-left:1px solid var(--track)}
.chart-grid i.zero{border-color:var(--bar)}
.chart-row{position:absolute;left:0;right:0;top:0;height:var(--row);display:grid;grid-template-columns:var(--label) 1fr var(--score);align-items:center;transition:transform 1s cubic-bezier(.25,.75,.2,1)}
.model-label{min-width:0;padding-right:12px;font-size:15px;line-height:1.3}
.method-name{display:block}
.bar-lane{position:relative;height:22px}
.bar{position:absolute;top:0;left:50%;width:0;height:100%;display:flex;align-items:center;overflow:hidden;background:var(--bar);border-radius:var(--radius-sm);transition:left 1s cubic-bezier(.25,.75,.2,1),width 1s cubic-bezier(.25,.75,.2,1)}
/* The comparison written inside LM2LM's bar; a narrow bar clips the trailing words, never the ratio. */
.bar-note{padding-inline:8px;font-size:13px;font-style:normal;line-height:1;color:#fff;white-space:nowrap}
.bar-note b{font-weight:650}
.chart-score{text-align:right;font-size:15px;font-variant-numeric:tabular-nums}
.chart-row.ours .bar{background:var(--accent)}
.chart-row.ours .method-name,.chart-row.ours .chart-score{font-weight:650}
.chart-axis{position:relative;height:22px;margin-left:var(--label);margin-right:var(--score);font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
.chart-axis span{position:absolute;transform:translateX(-50%)}

/* Line charts drawn from the paper's figure data (app.js builds the SVG) */

.chart-figure{border-top:1px solid var(--ink);padding-top:16px}
.chart-figure figcaption{margin-top:12px;max-width:46rem}
.legend{display:flex;flex-wrap:wrap;gap:6px 22px;padding:0;list-style:none;font-size:14.5px;color:var(--muted)}
.legend li{display:flex;align-items:center;gap:8px}
.legend li::before{content:"";width:20px;border-top:3px solid var(--bar)}
.legend .s-ours::before{border-color:var(--accent)}
.legend .s-ink::before{border-color:var(--ink)}
.panels{display:grid;gap:24px 32px;margin-top:18px}
.panels.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.panel{min-width:0;max-width:520px}
.panel h4{margin-bottom:6px;font-size:14.5px;font-weight:650;line-height:1.35}
.panel h4 small{margin-left:6px;font-size:13px;font-weight:400;color:var(--muted)}
.chart-svg{display:block;width:100%;height:auto;overflow:visible}
.chart-svg text{font-size:13px;fill:var(--muted);font-variant-numeric:tabular-nums}
.chart-svg .grid{stroke:var(--track)}
.chart-svg .vline{stroke:var(--bar);stroke-dasharray:1 4;stroke-linecap:round}
.chart-svg .ref{stroke:var(--bar);stroke-dasharray:5 4}
.chart-svg .line{fill:none;stroke:var(--bar);stroke-width:2.25;stroke-linejoin:round;stroke-linecap:round}
.chart-svg .whisker{stroke:var(--bar);stroke-width:1.25;opacity:.5}
.chart-svg .dot{fill:var(--bar);stroke:var(--bg);stroke-width:1.5}
.chart-svg .s-ours .line,.chart-svg .s-ours .whisker{stroke:var(--accent)}
.chart-svg .s-ours .dot{fill:var(--accent)}
.chart-svg .s-ink .line{stroke:var(--ink)}
.chart-svg .s-ink .dot{fill:var(--ink)}
.chart-svg .mark{fill:var(--ink);font-weight:600;paint-order:stroke;stroke:var(--bg);stroke-width:3px;stroke-linejoin:round}
.chart-svg .mark.ours{fill:var(--accent-text)}

/* Tables, ruled like a paper's */

.table-scroll{overflow-x:auto}
.table-figure figcaption{margin-bottom:10px}
.table-figure .note{margin-top:10px}
table{width:100%;border-collapse:collapse;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);font-size:15px;font-variant-numeric:tabular-nums}
th,td{padding:9px 12px;text-align:right;vertical-align:baseline;white-space:nowrap;border-bottom:1px solid var(--line)}
th:first-child,td:first-child{text-align:left;padding-left:0}
th:last-child,td:last-child{padding-right:0}
tbody tr:last-child>*{border-bottom:0}
thead th{font-size:13.5px;font-weight:600;color:var(--muted)}
tbody th{font-weight:400}
td.text,th.text{text-align:left}
tbody th .method-name{display:inline}
tr.ours>*{font-weight:650}
tr.group>th{padding-top:18px;font-size:13.5px;font-weight:600;color:var(--muted)}
tfoot>tr>*{font-weight:650;border-top:1px solid var(--ink);border-bottom:0}

/* Small bar lists: transfer, calibration ablation, cost */

.bar-figure{max-width:var(--measure)}
.bar-figure figcaption{margin-bottom:14px}
.bars{display:grid;gap:14px}
.mini-bar-label{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:6px;font-size:15.5px;line-height:1.35}
.mini-bar-label>span{min-width:0}
.mini-bar-label small{margin-left:8px;font-size:13px;font-weight:400;color:var(--muted)}
.mini-bar-label b{flex:none;font-weight:500;font-variant-numeric:tabular-nums}
.mini-bar-lane{height:10px;background:var(--track);border-radius:var(--radius-sm);overflow:hidden}
.mini-bar-lane i{display:block;min-width:3px;height:100%;background:var(--bar);border-radius:var(--radius-sm)}
.mini-bar-row.ours .mini-bar-lane i{background:var(--accent)}
.mini-bar-row.ours .mini-bar-label,.mini-bar-row.ours .mini-bar-label b{font-weight:650}

/* Cost: one row per approach. Each source of feedback is a pair of columns, a count and what it cost,
   under one spanning header, so the pairing is read from position. */
.compare-table{max-width:var(--measure)}
.compare-table thead th{text-align:center;vertical-align:bottom;white-space:normal}
.compare-table thead th,.compare-table td:nth-child(2),.compare-table td:nth-child(4){padding-left:32px}
.compare-table td.none{text-align:center;color:var(--muted)}

/* Citation */

.bibtex{max-width:48rem;padding:18px 20px;overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);font:13.5px/1.6 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere}
.cite-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
#copy-status{font-size:14.5px;color:var(--muted)}

footer{display:flex;align-items:center;gap:24px;padding-block:28px 36px;border-top:1px solid var(--line);font-size:14.5px;color:var(--muted)}
footer a{color:var(--muted)}
footer .footer-brand{font-weight:650;color:var(--ink);text-decoration:none}
footer p{margin-left:auto}

/* Narrower screens */

@media (max-width:1000px){
  :root{--label:176px;--score:62px}
  .hero-grid{grid-template-columns:1fr}
  .key-results{max-width:560px}
  .panels.two{grid-template-columns:1fr}
  .section{grid-template-columns:120px minmax(0,1fr);column-gap:40px}
}

@media (max-width:820px){
  .wrap{padding-inline:24px}
  .site-header nav{gap:18px}
  .nav-section{display:none}
  .hero{padding-top:44px;padding-bottom:36px}
  .lede{font-size:18.5px}
  .film{padding-bottom:48px}
  .section{grid-template-columns:1fr;padding-block:48px}
  .rail{position:static;padding-top:0;margin-bottom:10px;font-size:14.5px;color:var(--muted)}
}

@media (max-width:640px){
  :root{--label:128px;--score:54px;--row:48px}
  body{font-size:16px}
  .authors{font-size:16px}
  .lede{font-size:18px}
  .scroll-hint{display:block}
  .bar-note span{display:none}
  .panel{max-width:440px}
  .key-results th,.key-results td{padding:9px 6px}
  .compare-table table{font-size:14px}
  .compare-table thead th,.compare-table td:nth-child(2),.compare-table td:nth-child(4){padding-left:12px}
  .method-figure img{width:920px;max-width:none}
  .model-label{font-size:14.5px;padding-right:10px}
  .chart-head>span:nth-child(2){padding-right:8px}
  .benchmark-top{align-items:flex-start}
  footer{flex-wrap:wrap;gap:8px 20px}
}

@media (max-width:480px){
  .wrap{padding-inline:20px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}