/* Grasphouse — Anthropic research-publication palette on a long-form editorial layout.
   Palette tokens from the Anthropic design system; type set in that system's own
   named fallbacks (Source Serif, Inter, JetBrains Mono) since the Anthropic faces
   are not publicly distributed. */
:root{
  /* Anthropic tokens */
  --slate-dark:#141413; --slate-medium:#3d3d3a; --cloud-dark:#87867f;
  --cloud-medium:#b0aea5; --stone:#cccbc8; --oat-warm:#e3dacc; --manilla:#f5e3c7;
  --ivory-medium:#f0eee6; --ivory-light:#faf9f5; --clay:#d97757; --clay-deep:#c6613f;
  /* roles */
  --bg:var(--ivory-medium); --surface:var(--ivory-light); --panel:var(--oat-warm);
  --ink:var(--slate-dark); --body:var(--slate-medium);
  --muted:#605e55;                 /* darkened cloud: 5.6:1 on ivory, AA for small text */
  --rule:var(--stone); --rule-strong:var(--cloud-dark);
  --accent:var(--clay); --accent-deep:var(--clay-deep);
  --serif:"Source Serif 4","Source Serif Pro",Georgia,Charter,serif;
  --sans:Inter,system-ui,Arial,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace;
  --measure:760px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--body);
     font-family:var(--serif);font-size:20px;line-height:1.6;
     font-optical-sizing:auto;-webkit-font-smoothing:antialiased}
main{max-width:var(--measure);margin:0 auto;padding:76px 24px 120px}

/* ---- chrome (sans, per the system: sans is reserved for UI at 12–16px) ---- */
.meta{font-family:var(--sans);font-size:15px;letter-spacing:-.005em;color:var(--muted);
      margin:0 0 20px;line-height:1.4}
.meta a{color:var(--muted);text-decoration:none;border-bottom:1px solid var(--stone)}
.meta a:hover{color:var(--accent-deep);border-bottom-color:var(--accent-deep)}

/* ---- display + headings: serif at scale, editorial voice ---- */
h1{font-family:var(--serif);font-weight:400;font-size:52px;line-height:1.1;letter-spacing:-.01em;
   color:var(--ink);margin:0 0 14px}
h1 + .deck{font-size:22px;line-height:1.45;color:var(--muted);margin:0 0 22px;font-weight:400}
h2{font-family:var(--serif);font-weight:600;font-size:31px;line-height:1.25;letter-spacing:-.005em;
   color:var(--ink);margin:56px 0 14px}
h3{font-family:var(--serif);font-weight:600;font-size:24px;line-height:1.3;color:var(--ink);
   margin:36px 0 10px}
h2 .anchor,h3 .anchor{font-family:var(--sans);font-weight:400;color:var(--cloud-medium);
   text-decoration:none;font-size:.52em;margin-left:.4em;vertical-align:.18em;opacity:0;
   transition:opacity .15s}
h2:hover .anchor,h3:hover .anchor{opacity:1}
h2 .anchor:hover,h3 .anchor:hover{color:var(--accent-deep)}

/* ---- body ---- */
p{margin:0 0 20px}
strong,b{color:var(--ink);font-weight:600}
em{font-style:italic}
a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--cloud-dark)}
a:hover{color:var(--accent-deep);border-bottom-color:var(--accent-deep)}
hr{border:0;border-top:1px solid var(--rule);margin:44px 0}
ul,ol{padding-left:1.25em;margin:0 0 20px}
li{margin:0 0 8px;line-height:1.55}
li strong{color:var(--ink)}
blockquote{margin:20px 0;padding-left:20px;border-left:2px solid var(--oat-warm);color:var(--muted)}

/* ---- code ---- */
code{font-family:var(--mono);font-size:.82em;background:var(--oat-warm);padding:.1em .34em;
     border-radius:3px;color:var(--ink)}
pre{font-family:var(--mono);font-size:16px;line-height:1.4;background:var(--surface);
    border:1px solid var(--rule);border-radius:8px;padding:18px 20px;overflow-x:auto;
    margin:22px 0;color:var(--body)}
pre code{background:none;padding:0;font-size:1em;color:inherit}

/* ---- tables: tone shifts and hairlines, no elevation ---- */
table{border-collapse:collapse;width:100%;font-size:17px;margin:26px 0}
th{font-family:var(--sans);font-weight:600;font-size:15px;letter-spacing:-.005em;text-align:left;
   padding:10px 14px;border-bottom:1px solid var(--rule-strong);color:var(--ink);background:none}
td{padding:10px 14px;border-bottom:1px solid var(--rule);color:var(--body);vertical-align:top}
td strong{color:var(--ink)}
table a{color:var(--ink)}

/* ---- figures ---- */
figure{margin:32px 0}
figure img{width:100%;height:auto;display:block;border:1px solid var(--rule);border-radius:12px}
figcaption{font-family:var(--sans);font-size:15px;letter-spacing:-.005em;color:var(--muted);
           margin-top:10px;line-height:1.45}

/* ---- contents ---- */
.toc{font-family:var(--sans);font-size:15px;letter-spacing:-.005em;color:var(--muted);margin:0 0 40px}
.toc summary{cursor:pointer;font-weight:600;color:var(--ink);list-style:none;margin-bottom:4px}
.toc summary::-webkit-details-marker{display:none}
.toc summary::before{content:"\25B8";color:var(--cloud-dark);display:inline-block;
  font-size:1.3em;line-height:1;vertical-align:-.06em;margin-right:.42em}
.toc[open] summary::before{content:"\25BE";font-size:1.3em;line-height:1;vertical-align:-.06em;margin-right:.42em}
.toc ul{list-style:none;padding-left:0;margin:10px 0 0}
.toc ul ul{padding-left:1.15em;margin:3px 0}
.toc li{margin:3px 0;line-height:1.45}
.toc a{color:var(--muted);border-bottom:0}
.toc a:hover{color:var(--accent-deep)}
.toc .appendix{margin-top:10px;padding-top:8px;border-top:1px solid var(--rule)}
/* end-of-section link back to the Contents list (contents.js opens it) */
.back-to-contents{font-family:var(--sans);font-size:14px;letter-spacing:-.005em;text-align:right;margin:28px 0 0}
.back-to-contents a{display:inline-block;padding:12px 0 12px 12px;margin:-12px 0;color:var(--muted);border-bottom:0}
.back-to-contents a:hover{color:var(--accent-deep)}
#contents{scroll-margin-top:24px}

/* ---- side note: the demo-footer style, reusable as a standalone callout ---- */
.note{font-family:var(--sans);font-size:15px;letter-spacing:-.005em;line-height:1.5;
      color:var(--muted);background:var(--surface);border:1px solid var(--rule);
      border-radius:12px;padding:14px 18px;margin:26px 0}
.note strong{color:var(--ink)}
.mut{color:var(--muted);font-size:17px}
.goal{color:var(--muted);font-style:italic;margin:2px 0 14px}
.colophon{font-family:var(--sans);font-size:15px;letter-spacing:-.005em;color:var(--muted)}
kbd{font-family:var(--mono);font-size:.78em;background:var(--surface);border:1px solid var(--rule);
    border-bottom-width:2px;border-radius:4px;padding:.08em .4em;color:var(--ink)}

/* ---- live demo widgets ---- */
.demo{border:1px solid var(--rule);border-radius:16px;margin:30px 0;background:var(--surface);
      overflow:hidden}
.demo .dt,.demo .demo-title{font-family:var(--sans);background:var(--oat-warm);padding:11px 18px;
      font-size:15px;font-weight:600;letter-spacing:-.005em;color:var(--ink);
      border-bottom:1px solid var(--rule)}
.demo .live,.demo-live{float:right;color:var(--accent-deep);font-weight:600;font-size:14px}
.demo .db,.demo-body{display:flex;gap:16px;padding:18px;flex-wrap:wrap;position:relative}
.demo .code,.demo-code{flex:1 1 250px;margin:0;font-family:var(--mono);font-size:13.5px;
      line-height:1.75;background:var(--bg);border:1px solid var(--rule);border-radius:8px;
      padding:14px 16px;overflow-x:auto;color:var(--body)}
.demo .sw,.demo-stage-wrap{flex:1.35 1 310px;min-width:280px}
canvas.stage,#stage{width:100%;height:auto;display:block;background:var(--surface);
      border:1px solid var(--rule);border-radius:8px;touch-action:none}
.lit{padding:0 3px;border-radius:3px;border:1px solid var(--accent);background:rgba(217,119,87,.14);
     color:var(--accent-deep);font-weight:600;cursor:ew-resize;user-select:none}
.lit.active{background:rgba(217,119,87,.24)}
.word{border-bottom:1px dotted var(--cloud-dark);cursor:help}
.dn,.demo-note{font-family:var(--sans);border-top:1px solid var(--rule);padding:13px 18px 15px;
     font-size:15px;letter-spacing:-.005em;color:var(--muted);line-height:1.5;background:var(--bg)}
.demo-cards,.grid{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap}
.card,.btn{font-family:var(--sans);font-size:14px;letter-spacing:-.005em;text-align:left;
     background:var(--bg);border:1px solid var(--rule);border-radius:12px;padding:9px 13px;
     cursor:pointer;color:var(--muted);white-space:nowrap}
.card{flex:1}
.card b{display:block;font-size:15px;color:var(--ink);font-weight:600}
.card.sel,.btn.sel{background:rgba(217,119,87,.10);border-color:var(--accent);color:var(--accent-deep)}
.card.sel b{color:var(--accent-deep)}
.card.reset{flex:0 0 auto}
.btn{font-weight:600;margin:5px 7px 0 0;color:var(--ink);flex:0 0 auto}
.btn:hover,.card:hover{border-color:var(--cloud-dark)}
.card:focus-visible,.btn:focus-visible{outline:2px solid var(--accent-deep);outline-offset:2px}
.grid canvas{background:var(--surface);border:1px solid var(--rule);border-radius:6px;cursor:pointer}
.tip{position:absolute;background:var(--ink);color:var(--ivory-light);font-family:var(--sans);
     font-size:14px;padding:8px 12px;border-radius:8px;max-width:260px;pointer-events:none;
     display:none;z-index:5;line-height:1.4}
.panel{font-family:var(--mono);font-size:14px;background:var(--bg);border:1px solid var(--rule);
     border-radius:8px;padding:10px 12px;margin-top:10px;color:var(--ink)}
input[type=range]{width:100%;accent-color:#d97757}
.sw .row{display:flex;gap:10px;align-items:center;margin-top:10px}

@media (max-width:760px){
  main{padding:44px 18px 80px}
  body{font-size:18px}
  h1{font-size:38px} h2{font-size:27px} h3{font-size:21px}
  h1 + .deck{font-size:19px}
}

/* demos and figures may breathe wider than the text measure */
@media (min-width:920px){
  .demo{margin-left:-52px;margin-right:-52px}
  .demo .code,.demo-code{font-size:13px}
}

/* bracketed source + demo links, under the deck */
.pagelinks{font-family:var(--sans);font-size:15px;letter-spacing:-.005em;margin:0 0 22px;color:var(--cloud-dark)}
.pagelinks a{color:var(--accent-deep);border-bottom:0;text-decoration:none}
.pagelinks a:hover{text-decoration:underline;text-underline-offset:3px}
.pagelinks .sep{display:inline-block;width:.5em}

/* Homepage: a brief intro, then posts grouped by month, month in the left margin.
   Layout after the Transformer Circuits index; palette and type are the site's own. */
.home .home-header,.home main{max-width:var(--measure);margin-inline:auto;padding-inline:24px}
.home .home-header{padding-top:76px}
.home .wordmark{display:inline-flex;align-items:center;gap:.015em;font-size:52px;letter-spacing:-.025em;border:0;line-height:1.1}
.home .brand-mark{width:.72em;height:.72em;flex:none;overflow:visible;margin-top:.025em}
.home .brand-name{white-space:nowrap;font-weight:600}
.home .wordmark:hover{color:var(--ink)}
.home main{padding-top:28px;padding-bottom:96px}
.home h1{font-size:26px;font-weight:400;line-height:1.4;letter-spacing:0;color:var(--muted);margin:0 0 16px}
.home .home-intro p{font-size:20px;margin:0}
.home .entries{margin-top:16px}
.home .month{position:relative;padding-top:50px}
.home .month h2{font-family:var(--sans);font-size:12px;font-weight:400;letter-spacing:.06em;text-transform:uppercase;line-height:1.4;color:var(--muted);margin:0 0 16px;padding-bottom:8px;border-bottom:1px solid var(--rule)}
.home .month>ul{list-style:none;padding:0;margin:0}
.home .entry{position:relative;display:flow-root;margin:0}
.home .entry+.entry{margin-top:22px;padding-top:22px;border-top:1px solid var(--rule)}
.home .entry .thumb{float:right;width:220px;height:auto;margin:0 0 12px 28px;padding:8px;background:var(--surface);border:1px solid var(--rule);border-radius:8px}
.home .entry .title{display:block;font-family:var(--serif);font-weight:600;font-size:26px;line-height:1.25;letter-spacing:-.005em;color:var(--ink);border:0}
.home .entry .title::after{content:"";position:absolute;inset:-6px -10px}
.home .entry:hover .title{color:var(--accent-deep)}
.home .entry .tag{display:block;font-family:var(--sans);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:8px 0 4px}
.home .entry p{font-size:17px;line-height:1.55;color:var(--body);margin:0}
/* appendices: a layer under their post, as compact one-line rows */
.home .entry .appendices{position:relative;z-index:1;clear:both;list-style:none;margin:16px 0 0 24px;padding:0}
.home .appendices li{position:relative;margin:0;padding:12px 0;border-top:1px solid var(--rule);font-size:16px;line-height:1.5;color:var(--body)}
.home .appendices a{display:inline-block;padding:11px 0;margin:-11px 6px -11px 0;font-family:var(--sans);font-size:15px;font-weight:500;letter-spacing:-.01em;color:var(--ink);border:0}
.home .appendices a::after{content:"";position:absolute;inset:0}
.home .appendices li:hover a{color:var(--accent-deep)}
.home .entry:has(.appendices:hover) .title{color:var(--ink)}
@media(min-width:1100px){
 .home .month h2{position:absolute;left:-160px;top:58px;width:136px;margin:0;padding:0;border:0}
}
.home a:focus-visible{outline:2px solid var(--accent-deep);outline-offset:5px}
.home .skip-link{position:absolute;top:8px;left:16px;transform:translateY(-160%);background:var(--surface);padding:8px 16px;font-family:var(--sans);font-size:14px;z-index:10}
.home .skip-link:focus{transform:translateY(0)}
@media(max-width:760px){
 .home .home-header,.home main{padding-inline:18px}
 .home .home-header{padding-top:44px}
 .home .wordmark{font-size:38px}
 .home h1{font-size:22px}
 .home .home-intro p{font-size:18px}
 .home .month{padding-top:40px}
 .home .entry .title{font-size:21px}
 .home .entry .thumb{width:128px;margin-left:16px;padding:5px}
 .home .entry p{font-size:16px}
 .home .entry .appendices{margin-left:16px}
}

/* The G rests resolved. On load, and again on hover or keyboard focus (logo.js),
   a loose stroke settles into its crossbar. The load play is what phones see. */
.home .brand-mark{transform:perspective(180px) rotateX(var(--logo-rx,0deg)) rotateY(var(--logo-ry,0deg));transition:transform .5s ease}
.home .brand-insight{transform-origin:38px 28px}
.home .brand-insight.settle{animation:g-settle .9s cubic-bezier(.22,1,.36,1) .3s both}
.home .brand-insight.replay{animation-duration:.7s;animation-delay:0s}
@keyframes g-settle{from{transform:translate(1px,-8px) rotate(-42deg)}to{transform:none}}
@media(prefers-reduced-motion:reduce){
 .home .brand-mark{transform:none;transition:none}
 .home .brand-insight.settle{animation:none}
}