/* Distill-inspired typography for a single research blog post.
   Uses a centered text column with figures that can break out to wider
   widths. No frameworks, vanilla CSS. */

:root {
  --text-color: #181818;
  --text-muted: #5b5b5b;
  --link-color: #1f6feb;
  --rule-color: #e6e6e6;
  --bg-color: #ffffff;
  --accent: #c7541d;     /* warm orange used sparingly */
  --accent-2: #1f6feb;
  --code-bg: #f6f8fa;
  --pull-bg: #fafafa;
  --col-text: 700px;     /* main reading column */
  --col-figure: 1024px;  /* wider figure column */
  --col-bleed: 1240px;   /* full-bleed cap */
}

* { box-sizing: border-box; }

html { font-size: 17px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: "Source Serif Pro", "Source Serif 4", "EB Garamond",
    "Iowan Old Style", "Apple Garamond", Georgia, Cambria, "Times New Roman",
    Times, serif;
  font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
  color: var(--text-color);
  background: var(--bg-color);
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

/* Top brand strip */
.topbar {
  border-bottom: 1px solid var(--rule-color);
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 13px;
  color: var(--text-muted);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar a { color: inherit; text-decoration: none; }
.topbar a:hover { color: var(--text-color); }

.topbar .kicker {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-color);
}

/* Main layout: grid with three column tracks (margin, text, margin)
   that figures can opt out of with explicit grid-column rules. */
.article {
  display: grid;
  grid-template-columns:
    minmax(24px, 1fr)
    min(var(--col-text), calc(100% - 48px))
    minmax(24px, 1fr);
  row-gap: 0;
}

.article > * { grid-column: 2; }

.article > .wide {
  grid-column: 1 / -1;
  justify-self: center;
  width: min(var(--col-figure), 100% - 48px);
}

.article > .bleed {
  grid-column: 1 / -1;
  justify-self: center;
  width: min(var(--col-bleed), 100% - 24px);
}

/* Title block */
.title-block {
  padding: 72px 0 32px;
  border-bottom: 1px solid var(--rule-color);
  margin-bottom: 36px;
}

.title-block h1 {
  font-family: "Source Serif Pro", Georgia, serif;
  font-weight: 700;
  font-size: 44px;
  line-height: 1.12;
  margin: 0 0 18px;
  letter-spacing: -0.01em;
}

.title-block .subtitle {
  font-size: 20px;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.45;
  margin: 0 0 28px;
}

.byline {
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 13.5px;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 24px 40px;
}

.byline .label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
  color: #999;
  display: block;
  margin-bottom: 4px;
}

.byline .value { color: var(--text-color); }

/* TLDR / abstract callout */
.tldr {
  margin: 24px 0 40px;
  padding: 20px 24px;
  background: var(--pull-bg);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
  font-size: 16.5px;
}

.tldr .label {
  display: inline-block;
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

/* Headings */
h2 {
  font-family: "Source Serif Pro", Georgia, serif;
  font-size: 30px;
  line-height: 1.2;
  font-weight: 700;
  margin: 64px 0 14px;
  letter-spacing: -0.005em;
}

h3 {
  font-family: "Source Serif Pro", Georgia, serif;
  font-size: 22px;
  line-height: 1.25;
  font-weight: 700;
  margin: 40px 0 10px;
}

h4 {
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  margin: 28px 0 6px;
  color: var(--text-color);
}

p {
  margin: 0 0 18px;
  font-size: 17.5px;
  line-height: 1.65;
}

a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid rgba(31,111,235,0.25);
  transition: border-color 0.15s;
}
a:hover { border-bottom-color: var(--link-color); }

em { font-style: italic; }
strong { font-weight: 700; }

ul, ol {
  margin: 0 0 22px;
  padding-left: 24px;
  font-size: 17.5px;
}
li { margin: 4px 0; line-height: 1.6; }

blockquote {
  margin: 24px 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--rule-color);
  color: var(--text-muted);
  font-style: italic;
  font-size: 18px;
  line-height: 1.55;
}

/* Code */
code, .mono {
  font-family: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 16px 18px;
  border-radius: 4px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.5;
  margin: 22px 0;
}
pre code { background: transparent; padding: 0; }

/* Figures */
figure {
  margin: 38px 0 38px;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

figcaption {
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 14px;
  text-align: left;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

figcaption strong { color: var(--text-color); }

/* Tables */
.tbl-wrap { margin: 24px 0; overflow-x: auto; }
table.data {
  border-collapse: collapse;
  width: 100%;
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}
table.data th, table.data td {
  padding: 8px 12px;
  text-align: right;
  border-bottom: 1px solid var(--rule-color);
}
table.data th:first-child, table.data td:first-child {
  text-align: left;
}
table.data th {
  border-bottom: 1.5px solid var(--text-color);
  font-weight: 700;
  color: var(--text-color);
}
table.data tr.highlight td {
  background: rgba(199,84,29,0.06);
}
table.data td.best { font-weight: 700; }

/* Interactive widget container */
.widget {
  margin: 38px auto;
  background: #fcfcfc;
  border: 1px solid var(--rule-color);
  border-radius: 6px;
  padding: 22px 24px 26px;
}
.widget .widget-title {
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 4px;
}
.widget .widget-sub {
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 16px;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px 28px;
  font-family: -apple-system, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 13.5px;
  margin-bottom: 18px;
}
.controls label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.controls .lbl {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-weight: 500;
}
.controls .lbl .val {
  font-family: "JetBrains Mono", monospace;
  font-size: 12.5px;
  color: var(--accent);
  font-weight: 700;
}
.controls input[type=range] {
  width: 100%;
  accent-color: var(--accent);
}
.controls .preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.controls button.preset {
  font-family: -apple-system, "Inter", sans-serif;
  font-size: 12px;
  padding: 5px 10px;
  border-radius: 4px;
  border: 1px solid var(--rule-color);
  background: white;
  cursor: pointer;
  color: var(--text-color);
}
.controls button.preset:hover {
  background: #f0f0f0;
  border-color: #bcbcbc;
}
.controls button.preset.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.plot-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: center;
}
.plot-row > div { min-width: 0; }

.plot-row svg, .plot-single svg { display: block; max-width: 100%; height: auto; }
.widget svg { display: block; max-width: 100%; height: auto; }

.legend {
  font-family: -apple-system, "Inter", sans-serif;
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}
.legend .item { display: flex; align-items: center; gap: 6px; }
.legend .swatch {
  display: inline-block;
  width: 14px;
  height: 3px;
  border-radius: 1px;
  vertical-align: middle;
}
.legend .swatch.square { height: 12px; width: 12px; }

/* Side-by-side example cards */
.example-card {
  border: 1px solid var(--rule-color);
  border-radius: 6px;
  padding: 16px 18px;
  margin: 14px 0;
  background: #fcfcfc;
}
.example-card .ctx {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
  background: white;
  border: 1px solid var(--rule-color);
  border-radius: 4px;
  padding: 10px 12px;
  margin-bottom: 12px;
}
.example-card .ctx .chosen {
  background: rgba(31,111,235,0.18);
  border-radius: 2px;
  padding: 0 2px;
  font-weight: 700;
  color: var(--accent-2);
}
.example-card .ctx .post-dim { color: #b5b5b5; }
.example-card .meta {
  font-family: -apple-system, "Inter", sans-serif;
  font-size: 12.5px;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}
.example-card .meta b { color: var(--text-color); font-weight: 700; }
.example-card .topk-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.example-card .topk h5 {
  font-family: -apple-system, "Inter", sans-serif;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 6px;
}
.example-card .topk table {
  width: 100%;
  border-collapse: collapse;
  font-family: "JetBrains Mono", monospace;
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}
.example-card .topk td {
  padding: 3px 6px;
  border-bottom: 1px dotted var(--rule-color);
}
.example-card .topk td.tok { color: var(--text-color); }
.example-card .topk td.bar {
  width: 100%;
  position: relative;
  padding-right: 6ch;
}
.example-card .topk td.bar .barfill {
  position: absolute;
  inset: 4px 6ch 4px 0;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(31,111,235,0.20), rgba(31,111,235,0.45));
}
.example-card .topk td.bar .barfill.warp {
  background: linear-gradient(90deg, rgba(199,84,29,0.22), rgba(199,84,29,0.55));
}
.example-card .topk td.bar .pcnt {
  position: absolute;
  right: 0; top: 0; bottom: 0;
  display: flex;
  align-items: center;
  padding: 0 4px;
  color: var(--text-color);
  font-size: 11.5px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  background: #fcfcfc;
  border-radius: 2px;
}

/* Variant chooser */
.variant-tabs {
  display: flex;
  gap: 6px;
  margin: 10px 0 14px;
  font-family: -apple-system, "Inter", sans-serif;
  font-size: 13px;
}
.variant-tabs button {
  border: 1px solid var(--rule-color);
  background: white;
  color: var(--text-color);
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
}
.variant-tabs button.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Footnotes / refs */
.refs ol { padding-left: 22px; }
.refs li { margin-bottom: 6px; font-size: 14.5px; line-height: 1.5; color: var(--text-muted); }
.refs li a { color: var(--link-color); }
.refs li .ttl { color: var(--text-color); }

/* KaTeX small tweak: math doesn't need to inherit the serif italic shape */
.katex { font-size: 1.02em; }
.katex-display { margin: 18px 0; }

/* Footer */
.site-footer {
  margin-top: 80px;
  border-top: 1px solid var(--rule-color);
  padding: 30px 0 60px;
  font-family: -apple-system, "Inter", sans-serif;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

/* Responsive */
@media (max-width: 720px) {
  html { font-size: 16px; }
  .title-block h1 { font-size: 32px; }
  .title-block .subtitle { font-size: 17px; }
  h2 { font-size: 24px; margin-top: 48px; }
  h3 { font-size: 19px; }
  .plot-row { grid-template-columns: 1fr; }
  .example-card .topk-row { grid-template-columns: 1fr; }
  .controls { grid-template-columns: 1fr; }
}