/* Book and site typefaces (SIL Open Font License 1.1, see OFL.txt). Generated from Fontsource;
   url() paths are relative to this directory and rewritten by each builder. */
@font-face {
  font-family: 'Inter Tight';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('assets/fonts/inter-tight-greek-wght-normal.woff2') format('woff2');
  unicode-range: U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF;
}
@font-face {
  font-family: 'Inter Tight';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('assets/fonts/inter-tight-latin-ext-wght-normal.woff2') format('woff2');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: 'Inter Tight';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('assets/fonts/inter-tight-latin-wght-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Inter Tight';
  font-style: italic;
  font-display: swap;
  font-weight: 100 900;
  src: url('assets/fonts/inter-tight-greek-wght-italic.woff2') format('woff2');
  unicode-range: U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF;
}
@font-face {
  font-family: 'Inter Tight';
  font-style: italic;
  font-display: swap;
  font-weight: 100 900;
  src: url('assets/fonts/inter-tight-latin-ext-wght-italic.woff2') format('woff2');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: 'Inter Tight';
  font-style: italic;
  font-display: swap;
  font-weight: 100 900;
  src: url('assets/fonts/inter-tight-latin-wght-italic.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url('assets/fonts/jetbrains-mono-greek-wght-normal.woff2') format('woff2');
  unicode-range: U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF;
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url('assets/fonts/jetbrains-mono-latin-ext-wght-normal.woff2') format('woff2');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url('assets/fonts/jetbrains-mono-latin-wght-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: normal;
  font-display: swap;
  font-weight: 400;
  src: url('assets/fonts/instrument-serif-latin-ext-400-normal.woff2') format('woff2');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: normal;
  font-display: swap;
  font-weight: 400;
  src: url('assets/fonts/instrument-serif-latin-400-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: italic;
  font-display: swap;
  font-weight: 400;
  src: url('assets/fonts/instrument-serif-latin-ext-400-italic.woff2') format('woff2');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: italic;
  font-display: swap;
  font-weight: 400;
  src: url('assets/fonts/instrument-serif-latin-400-italic.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
/* Open LLM — site styles. No scripts, no remote resources. The @font-face rules for the
   self-hosted OFL fonts (assets/fonts/) are prepended by scripts/build-site.js from the same
   assets/fonts/fonts.css the book uses. */

:root {
  --paper: #f2efe8;
  --paper-2: #e9e5db;
  --ink: #0e1116;
  --muted: #5a5e66;
  --rule: rgb(14 17 22 / .14);
  --accent: #2847f0;
  --panel: #0e1116;
  --panel-ink: #ece8df;
  --panel-muted: #9a9ea6;
  --serif: "Instrument Serif", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Inter Tight", "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --pad: clamp(1.25rem, 4vw, 3.5rem);
  --max: 1360px;
  --ease: cubic-bezier(.2, .7, .1, 1);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0c0e12;
    --paper-2: #15181e;
    --ink: #ece8df;
    --muted: #9da1a9;
    --rule: rgb(236 232 223 / .14);
    --accent: #8ea4ff;
    --panel: #ece8df;
    --panel-ink: #0e1116;
    --panel-muted: #50545b;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 400 1.0625rem/1.6 var(--sans);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { color: var(--paper); background: var(--accent); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 2px; }
img { display: block; max-width: 100%; height: auto; }
em { font-style: italic; }
.mono { font-family: var(--mono); font-size: .75rem; font-weight: 450; letter-spacing: .02em; text-transform: uppercase; }

.skip-link { position: absolute; left: var(--pad); top: -4rem; z-index: 10; padding: .6rem 1rem; color: var(--paper); background: var(--ink); }
.skip-link:focus { top: 1rem; }

/* Masthead */
.masthead {
  max-width: var(--max); margin: 0 auto; padding: 1.4rem var(--pad);
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem;
  border-bottom: 1px solid var(--rule);
}
.wordmark { justify-self: start; font: italic 400 1.6rem/1 var(--serif); text-decoration: none; letter-spacing: -.01em; }
.wordmark span { margin-left: .25rem; font: 600 .7rem/1 var(--mono); letter-spacing: .12em; font-style: normal; vertical-align: .45em; }
.masthead-meta { margin: 0; color: var(--muted); }
.masthead nav { justify-self: end; display: flex; gap: clamp(.9rem, 2vw, 1.8rem); }
.masthead nav a, .colophon nav a { position: relative; font-size: .9rem; font-weight: 500; text-decoration: none; }
.masthead nav a::after, .colophon nav a::after, .link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -.2em; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform .35s var(--ease);
}
.masthead nav a:hover::after, .colophon nav a:hover::after, .link:hover::after { transform: scaleX(1); transform-origin: left; }

/* Hero */
.hero {
  max-width: var(--max); margin: 0 auto; padding: clamp(3rem, 7vw, 6rem) var(--pad) clamp(3rem, 6vw, 5rem);
  display: grid; grid-template-columns: minmax(0, 1fr) clamp(200px, 23vw, 320px); column-gap: clamp(2rem, 5vw, 5rem);
}
.kicker { grid-column: 1 / -1; margin: 0 0 1.6rem; color: var(--muted); }
.display {
  grid-column: 1; grid-row: 2; margin: 0;
  font: 400 clamp(3.3rem, 8.4vw, 8.8rem)/.9 var(--serif); letter-spacing: -.035em;
}
.display em { color: var(--accent); }
.hero-foot { grid-column: 1; grid-row: 3; max-width: 40rem; padding-top: clamp(2rem, 4vw, 3.25rem); }
.lede { margin: 0 0 2rem; color: var(--muted); font-size: clamp(1.05rem, 1.4vw, 1.25rem); line-height: 1.55; text-wrap: pretty; }
.cta { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.75rem; }
.button {
  display: inline-flex; align-items: center; gap: .6rem; min-height: 3.1rem; padding: 0 1.4rem;
  color: var(--paper); background: var(--ink); border-radius: 999px;
  font-weight: 550; text-decoration: none; transition: background-color .3s var(--ease), gap .3s var(--ease);
}
.button:hover { background: var(--accent); gap: 1rem; }
.link { position: relative; display: inline-flex; align-items: baseline; gap: .45rem; font-weight: 550; text-decoration: none; }
.link .mono { color: var(--muted); font-size: .7rem; }
.cover { grid-column: 2; grid-row: 2 / span 2; align-self: end; margin: 0; }
.cover img {
  border-radius: 3px;
  box-shadow: 0 1px 1px rgb(0 0 0 / .08), 0 24px 48px -12px rgb(10 14 24 / .35);
  transform: rotate(2.2deg); transition: transform .6s var(--ease);
}
.cover:hover img { transform: rotate(0deg) translateY(-6px); }

/* Figures */
.figures { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }
.figures dl { margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--rule); }
.figures div { padding: 1.6rem 1.25rem 1.4rem; border-left: 1px solid var(--rule); }
.figures div:first-child { border-left: 0; padding-left: 0; }
.figures dt { color: var(--muted); }
.figures dd { margin: .5rem 0 0; font: 400 clamp(2.8rem, 6vw, 5.2rem)/1 var(--serif); letter-spacing: -.02em; font-variant-numeric: lining-nums tabular-nums; }

/* Sections */
section[id] { scroll-margin-top: 1.5rem; }
.contents, .made, .formats, .faq { max-width: var(--max); margin: 0 auto; padding: clamp(4.5rem, 10vw, 8.5rem) var(--pad) 0; }
.section-head { display: grid; grid-template-columns: minmax(8rem, 1fr) 3fr; column-gap: 2rem; align-items: baseline; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.section-head p:not(.label) { grid-column: 2; max-width: 38rem; margin: 1rem 0 0; color: var(--muted); }
.label { margin: 0; color: var(--muted); }
h2 { margin: 0; font: 400 clamp(2.4rem, 5.6vw, 5rem)/.98 var(--serif); letter-spacing: -.025em; text-wrap: balance; }
h2 em { color: var(--accent); }

/* Contents index */
.index { list-style: none; margin: 0; padding: 0; border-bottom: 1px solid var(--rule); }
.index li { border-top: 1px solid var(--rule); }
.index a {
  display: grid; grid-template-columns: minmax(8rem, 1fr) 1.6fr 1.4fr 2rem; column-gap: 2rem; align-items: baseline;
  padding: 1.35rem 0; text-decoration: none; transition: background-color .35s var(--ease);
}
.index .num { color: var(--muted); font: italic 400 1.5rem/1 var(--serif); }
.index .title { font: 400 clamp(1.6rem, 2.8vw, 2.35rem)/1.05 var(--serif); letter-spacing: -.015em; transition: transform .45s var(--ease), color .35s var(--ease); }
.index .desc { color: var(--muted); font-size: .95rem; line-height: 1.5; }
.index .go { justify-self: end; color: var(--muted); font-size: 1.2rem; transition: transform .45s var(--ease), color .35s var(--ease); }
.index a:hover .title, .index a:focus-visible .title { color: var(--accent); transform: translateX(.6rem); }
.index a:hover .go, .index a:focus-visible .go { color: var(--accent); transform: translate(2px, -2px); }

/* Labs panel */
.labs {
  width: min(100% - 2 * var(--pad), var(--max) - 2 * var(--pad));
  margin: clamp(4.5rem, 10vw, 8.5rem) auto 0;
  padding: clamp(2.5rem, 6vw, 5.5rem) clamp(1.25rem, 5vw, 4.5rem);
  color: var(--panel-ink); background: var(--panel); border-radius: clamp(10px, 2vw, 22px);
}
.labs .section-head p:not(.label), .labs .label { color: var(--panel-muted); }
.labs h2 em { color: inherit; font-style: italic; opacity: .72; }
.lab-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); column-gap: 3rem; font-size: .85rem; text-transform: none; letter-spacing: 0; }
.lab-list li { border-top: 1px solid color-mix(in srgb, var(--panel-ink) 16%, transparent); }
.lab-list a { display: flex; gap: 1.4rem; padding: 1rem 0; text-decoration: none; transition: padding-left .4s var(--ease); }
.lab-list span { color: var(--panel-muted); min-width: 1.6rem; }
.lab-list a:hover { padding-left: .6rem; }
.lab-list a:hover span { color: inherit; }

/* How it was made */
.made { display: grid; grid-template-columns: minmax(8rem, 1fr) 3fr; column-gap: 2rem; }
.made .label { grid-column: 1; }
.statement { grid-column: 2; font-size: clamp(2.6rem, 6.6vw, 6.2rem); line-height: .95; }
.made-body { grid-column: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem 2.5rem; margin-top: clamp(2rem, 4vw, 3rem); color: var(--muted); }
.made-body p { margin: 0; }
.made-body .links { grid-column: 1 / -1; display: flex; gap: 2rem; color: var(--ink); }

/* Formats */
.format-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--rule); }
.format {
  display: flex; flex-direction: column; gap: .7rem; padding: 1.8rem 1.6rem 2.2rem 0; text-decoration: none;
  border-bottom: 1px solid var(--rule); transition: background-color .35s var(--ease);
}
.format + .format { padding-left: 1.6rem; border-left: 1px solid var(--rule); }
.format .mono { color: var(--muted); }
.format strong { font: 400 2rem/1.05 var(--serif); letter-spacing: -.015em; transition: color .3s var(--ease); }
.format span:last-child { color: var(--muted); font-size: .95rem; }
.format:hover strong { color: var(--accent); }
.fineprint { margin: 1.4rem 0 0; color: var(--muted); text-transform: none; letter-spacing: 0; }

/* FAQ */
.faq-list { margin-left: calc((100% - 2rem) / 4 + 2rem); border-bottom: 1px solid var(--rule); }
details { border-top: 1px solid var(--rule); }
summary {
  display: flex; justify-content: space-between; gap: 1rem; padding: 1.25rem 0; cursor: pointer; list-style: none;
  font: 400 1.55rem/1.2 var(--serif);
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font: 300 1.4rem/1 var(--sans); color: var(--muted); transition: transform .35s var(--ease); }
details[open] summary::after { transform: rotate(45deg); }
details p { max-width: 44rem; margin: 0 0 1.5rem; color: var(--muted); }
details a { color: var(--ink); }
code { font: 450 .85em var(--mono); padding: .1em .35em; border-radius: 4px; background: var(--paper-2); }

/* Colophon */
.colophon { max-width: var(--max); margin: clamp(5rem, 11vw, 9rem) auto 0; padding: 0 var(--pad) 2rem; overflow: hidden; }
.giant { margin: 0; padding-bottom: .12em; font: italic 400 clamp(6rem, 25vw, 22rem)/.9 var(--serif); letter-spacing: -.05em; white-space: nowrap; }
.giant span { font: 600 .16em/1 var(--mono); font-style: normal; letter-spacing: .1em; vertical-align: .5em; margin-left: .15em; color: var(--accent); }
.colophon-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; margin-top: 2rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .85rem; }
.colophon-row p { margin: 0; }
.colophon nav { display: flex; gap: 1.5rem; }

/* 404 */
.notfound { max-width: var(--max); margin: 0 auto; padding: clamp(5rem, 14vw, 11rem) var(--pad); }
.notfound .display { font-size: clamp(3rem, 9vw, 8rem); margin: 1rem 0 2rem; }

/* Motion: a short entrance for the opening view, and rows that settle as they scroll in. */
@media (prefers-reduced-motion: no-preference) {
  .reveal { animation: rise .9s var(--ease) both; }
  .hero .reveal:nth-child(2) { animation-delay: .06s; }
  .hero-foot .lede { animation-delay: .18s; }
  .hero-foot .cta { animation-delay: .26s; }
  .cover.reveal { animation-delay: .34s; }
  @keyframes rise { from { opacity: 0; transform: translateY(18px); } }
  @supports (animation-timeline: view()) {
    .index li, .lab-list li, .format, .figures div {
      animation: settle linear both; animation-timeline: view(); animation-range: entry 0% entry 70%;
    }
    @keyframes settle { from { opacity: 0; transform: translateY(14px); } }
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0s !important; }
  .cover img { transform: none; }
}

/* Adaptation */
@media (max-width: 960px) {
  .index a { grid-template-columns: 3.5rem 1fr 2rem; row-gap: .4rem; }
  .index .desc { grid-column: 2; grid-row: 2; }
  .index .go { grid-column: 3; grid-row: 1; }
  .section-head, .made { grid-template-columns: 1fr; }
  .section-head p:not(.label), .statement, .made-body, .made .label { grid-column: 1; }
  h2 { margin-top: .9rem; }
  .faq-list { margin-left: 0; }
}
@media (max-width: 760px) {
  .masthead { grid-template-columns: 1fr auto; }
  .masthead-meta { display: none; }
  .hero { grid-template-columns: 1fr; }
  .cover { grid-column: 1; grid-row: auto; width: min(68%, 300px); margin-top: 2.5rem; }
  .figures dl { grid-template-columns: repeat(2, 1fr); }
  .figures div:nth-child(3) { border-left: 0; padding-left: 0; }
  .figures div:nth-child(n + 3) { border-top: 1px solid var(--rule); }
  .lab-list, .made-body, .format-grid { grid-template-columns: 1fr; }
  .format + .format { padding-left: 0; border-left: 0; }
}
@media (max-width: 420px) {
  .masthead nav a:nth-child(n + 3) { display: none; }
}