:root {
  --paper: #faf6ef;
  --paper-2: #f3ece0;
  --card: #ffffff;
  --ink: #2a2431;
  --muted: #574f60;
  --line: #e4dccf;
  --brand: #5b3fd9;
  --on-brand: #fff;
  --brand-soft: #ece6ff;
  --llm: #c9c1d6;
  --slm: #a593e8;
  --xslm: #5b3fd9;
  --tiny: #e0892f;
  --code-bg: #231d2b;
  --code-bar: #362e41;
  --code-ink: #f1ecf7;
  --small: 0.9375rem;
  --measure: 70ch;
  --radius: 14px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17141c;
    --paper-2: #1e1a25;
    --card: #241f2c;
    --ink: #eee9f4;
    --muted: #bdb4c9;
    --line: #362f40;
    --brand: #a08bff;
    --on-brand: #17141c;
    --brand-soft: #2c2440;
    --llm: #5a5166;
    --slm: #7c68d6;
    --xslm: #a08bff;
    --code-bg: #0f0d13;
    --code-bar: #241f2c;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.65 var(--font);
}

a { color: var(--brand); text-underline-offset: 0.15em; }

p { text-wrap: pretty; }

code { font-family: var(--mono); font-size: var(--small); }

pre code { font-size: inherit; }

p code, li code, td code, .flow code {
  background: var(--brand-soft);
  padding: 0.1em 0.35em;
  border-radius: 6px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.wrap { max-width: 1080px; margin-inline: auto; padding-inline: 20px; }

section { padding-block: 64px; }

.band { background: var(--paper-2); }

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5em; text-wrap: balance; }

h2 { font-size: clamp(1.5rem, 3vw, 2rem); }

h3 { font-size: 1.25rem; }

.lead { color: var(--muted); max-width: var(--measure); margin-block: 0 24px; }

#origin p:not(.cite p) { max-width: var(--measure); }

/* top bar */
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.top-row { display: flex; align-items: center; gap: 24px; min-height: 56px; }

.brand { font-weight: 800; font-size: 1.2rem; text-decoration: none; letter-spacing: 0.02em; }

.nav { display: flex; gap: 18px; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }

.nav a { color: var(--muted); text-decoration: none; font-size: var(--small); padding-block: 8px; }

.nav a:hover { color: var(--brand); }

/* hero */
.hero { padding-block: 72px 64px; }

.eyebrow { color: var(--brand); font-weight: 700; font-size: var(--small); text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 12px; }

.hero h1 { font-size: clamp(2.6rem, 7vw, 4.4rem); letter-spacing: -0.02em; }

.hero h1 span { display: block; font-size: clamp(1.5rem, 3vw, 2rem); color: var(--muted); font-weight: 600; letter-spacing: 0; margin-top: 6px; }

.definition {
  margin-top: 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-inline-start: 6px solid var(--brand);
  border-radius: var(--radius);
  padding: 24px 28px;
  max-width: 780px;
  font-size: 1.15rem;
  box-shadow: 0 10px 30px rgb(40 20 80 / 0.06);
}

.definition p { margin: 0 0 10px; }

.definition p:last-child { margin-bottom: 0; }

.term { font-weight: 800; font-size: 1.25rem; }

.term span { font-weight: 400; color: var(--muted); font-size: var(--small); }

.coined { color: var(--muted); font-size: var(--small); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid var(--brand);
  text-decoration: none;
  font-weight: 700;
}

.btn.primary { background: var(--brand); color: var(--on-brand); }

.btn:hover { filter: brightness(1.08); }

/* size scale */
.scale { table-layout: fixed; margin-block-start: 24px; }

.scale th:nth-child(1) { width: 25%; }
.scale th:nth-child(2) { width: 30%; }
.scale th:nth-child(3), .scale th:nth-child(4) { width: 22.5%; }

.scale td { vertical-align: middle; }

.scale small { display: block; color: var(--muted); font-size: var(--small); line-height: 1.4; }

.scale-track {
  display: block;
  position: relative;
  height: 22px;
  background: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px calc(100% / 9));
  border-radius: 6px;
}

.scale-bar {
  position: absolute;
  inset-block: 0;
  inset-inline-start: var(--from);
  inline-size: calc(var(--to) - var(--from));
  min-inline-size: 8px;
  border-radius: 6px;
}

.llm .scale-bar { background: var(--llm); }
.slm .scale-bar { background: var(--slm); }
.xslm .scale-bar { background: var(--xslm); box-shadow: 0 0 0 3px var(--brand-soft); }
.tiny .scale-bar { background: var(--tiny); }
.xslm strong { color: var(--brand); }

.scale-ticks {
  display: block;
  position: relative;
  height: 1.4em;
  margin-block-start: 4px;
  font: 400 var(--small) var(--mono);
}

.scale-ticks span { position: absolute; }
.scale-ticks span:nth-child(2) { inset-inline-start: 33.3%; translate: -50%; }
.scale-ticks span:nth-child(3) { inset-inline-start: 66.7%; translate: -50%; }
.scale-ticks span:nth-child(4) { inset-inline-end: 0; }

/* tables */
.table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.table th, .table td { text-align: start; padding: 14px 16px; border-bottom: 1px solid var(--line); }

.table th { background: var(--paper-2); font-size: var(--small); color: var(--muted); vertical-align: top; }

.table tr:last-child td { border-bottom: 0; }

.table .hl td { background: var(--brand-soft); }

.params { max-width: 760px; }

.params td:nth-child(2), .params td:nth-child(3), .params th:nth-child(3) { white-space: nowrap; }

.params td:nth-child(2):not(:last-child) { font-family: var(--mono); font-size: var(--small); }

.params td:last-child, .params th:last-child { text-align: end; font-variant-numeric: tabular-nums; }

/* cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-block: 8px 40px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.card p { margin: 0; }

.num, .step {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--brand);
  color: var(--on-brand);
  font-weight: 800;
  margin-bottom: 12px;
}

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }

.split ul { padding-inline-start: 20px; margin: 0; }

.split li { margin-bottom: 8px; }

/* pipeline */
.flow {
  list-style: none;
  padding: 0;
  margin: 28px 0 40px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.flow li {
  --pad: 22px;
  position: relative;
  display: grid;
  grid-template-columns: 34px 220px minmax(0, 1fr);
  gap: 0 20px;
  padding: var(--pad) 24px;
  border-bottom: 1px solid var(--line);
}

.flow li:last-child { border-bottom: 0; }

.flow li:not(:last-child)::after {
  content: "";
  position: absolute;
  inset-inline-start: calc(24px + 16px);
  top: calc(var(--pad) + 38px);
  bottom: calc(4px - var(--pad));
  width: 2px;
  background: var(--slm);
  z-index: 1;
}

.flow h3 { margin-bottom: 6px; }

.flow-name code { display: inline-block; margin-block-end: 4px; }

.flow p { margin: 0; max-width: var(--measure); }

.flow .step { margin-bottom: 0; }

.flow h4 { font-size: 1.25rem; line-height: 1.25; margin: 0 0 6px; }

.flow-name span { color: var(--muted); font-size: var(--small); }

.purpose { margin-block-end: 40px; }

.purpose > p { max-width: var(--measure); margin-block: 0 20px; }

.purpose .flow { margin: 0; }

/* code */
.code-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 500px), 1fr)); gap: 20px; }

.code { display: flex; flex-direction: column; margin: 0; position: relative; min-width: 0; }

.split > *, .code-grid > * { min-width: 0; }

.code figcaption {
  background: var(--code-bar);
  color: var(--code-ink);
  font-size: var(--small);
  font-weight: 700;
  line-height: 1.4;
  padding: 10px 84px 10px 18px;
  border-radius: 12px 12px 0 0;
}

.code pre {
  flex: 1;
  margin: 0;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 16px 18px;
  border-radius: 0 0 12px 12px;
  overflow-x: auto;
  font-size: var(--small);
  line-height: 1.6;
}

.code.out pre { color: #b9f0c9; }

.copy {
  position: absolute;
  top: 7px;
  inset-inline-end: 8px;
  border: 0;
  border-radius: 8px;
  padding: 4px 10px;
  background: rgb(255 255 255 / 0.16);
  color: var(--code-ink);
  font: 0.875rem var(--font);
  cursor: pointer;
}

.copy:hover { background: rgb(255 255 255 / 0.28); }

#run h3 { margin-top: 40px; }

.note { max-width: var(--measure); margin-block-end: 0; }

/* course steps */
.steps { columns: 2; column-gap: 40px; padding-inline-start: 22px; }

.steps li { margin-bottom: 8px; break-inside: avoid; }

/* origin */
.cite {
  margin: 20px 0 0;
  background: var(--card);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.cite figcaption { font-size: var(--small); font-weight: 700; color: var(--muted); }

.cite p { margin: 4px 0 0; font-family: var(--mono); font-size: var(--small); overflow-wrap: anywhere; }

/* footer */
.foot { border-top: 1px solid var(--line); padding-block: 28px; color: var(--muted); font-size: var(--small); }

.foot p { margin: 0 0 6px; }

@media (max-width: 860px) {
  .cards, .split { grid-template-columns: 1fr; }
  .flow li { grid-template-columns: 34px 170px minmax(0, 1fr); }
  .steps { columns: 1; }
}

@media (max-width: 760px) {
  .scale, .scale thead, .scale tbody, .scale tr, .scale td { display: block; width: auto; }
  .scale th { display: none; }
  .scale th.scale-col { display: block; width: auto; border-bottom: 0; }
  .scale tbody tr { display: grid; gap: 6px; padding: 14px 16px; border-top: 1px solid var(--line); }
  .scale td { padding: 0; border: 0; }
  .scale .hl { background: var(--brand-soft); }
  .scale .hl td { background: none; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  section { padding-block: 44px; }
  .nav {
    padding-inline-end: 24px;
    -webkit-mask-image: linear-gradient(to left, transparent, #000 24px);
    mask-image: linear-gradient(to left, transparent, #000 24px);
  }
  .flow li { --pad: 16px; grid-template-columns: 34px minmax(0, 1fr); gap: 8px 14px; padding-inline: 16px; }
  .flow li:not(:last-child)::after { inset-inline-start: calc(16px + 16px); }
  .flow p { grid-column: 2; }
  .table th, .table td { padding: 10px 12px; }
  .scale th.scale-col { padding: 12px 16px; }
  .scale td { padding: 0; }
}