@font-face { font-family: "Noto Sans"; src: url("/fonts/NotoSans-Regular.woff") format("woff"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Noto Sans"; src: url("/fonts/NotoSans-Bold.woff") format("woff"); font-weight: 700; font-display: swap; }
@font-face { font-family: "Caveat"; src: url("/fonts/Caveat-Bold.woff") format("woff"); font-weight: 700; font-display: swap; }

/* Manim palette from the video explainers */
:root {
  color-scheme: dark;
  --ground: #0e1116;
  --panel: #151a22;
  --line: #2a313d;
  --ink: #ece9e1;
  --muted: #a3aab7;
  --blue: #58c4dd;
  --yellow: #f7d96f;
  --green: #83c167;
  --red: #fc6255;
  --purple: #b189f5;
  --board: #213429;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  /* footer pinned to the bottom on short pages */
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--ground);
  color: var(--ink);
  font-family: "Noto Sans", system-ui, sans-serif;
  font-size: 1.0625rem;
  font-size-adjust: from-font;
  line-height: 1.6;
}

a { color: var(--blue); text-underline-offset: 0.18em; }
a:hover { color: var(--yellow); }

.wrap { width: min(100% - 2rem, 44rem); margin-inline: auto; }

/* chalkboard header, like the jingle card */
.board {
  background: radial-gradient(ellipse at 50% 40%, #2f4a3c 0%, var(--board) 60%, #18261e 100%);
  border-bottom: 0.6rem solid #6b4a2e;
  box-shadow: inset 0 0 4rem rgb(0 0 0 / 0.5);
  padding-block: 2.5rem 2rem;
  text-align: center;
}
.chalk {
  font-family: "Caveat", "Comic Sans MS", cursive;
  font-weight: 700;
  line-height: 1;
  margin: 0;
  color: #f2efe6;
  text-wrap: balance;
}
.chalk .big { display: block; font-size: clamp(3.5rem, 2rem + 8vw, 6rem); color: var(--yellow); }
.chalk .top { display: block; font-size: clamp(2.25rem, 1.5rem + 4vw, 3.5rem); }
.chalk .by { display: block; font-size: clamp(1.75rem, 1.25rem + 2.5vw, 2.5rem); margin-top: 0.4rem; }
.underline { display: block; width: 12rem; height: 0.9rem; margin: 0.25rem auto 0; }

.crumbs { font-size: 0.9rem; color: var(--muted); padding-block: 1rem 0; }
.crumbs a { color: var(--muted); }

h1, h2, h3 { line-height: 1.2; text-wrap: balance; }
h1 { font-size: clamp(2rem, 1.4rem + 3vw, 2.75rem); color: var(--yellow); margin: 1.5rem 0 0.5rem; }
.lead { color: var(--muted); margin-top: 0; text-wrap: pretty; }

main { flex: 1; padding-bottom: 3rem; }

/* numbered lesson points */
.point { border-top: 1px solid var(--line); padding-block: 1.5rem; }
.point h2 { display: flex; gap: 0.75rem; align-items: baseline; font-size: 1.35rem; margin: 0 0 0.5rem; }
.point h2 .n {
  flex: none;
  font-family: "Caveat", cursive;
  font-size: 2.2rem;
  line-height: 1;
  color: var(--yellow);
}
.point p, .point li { text-wrap: pretty; max-width: 68ch; }
.point ul { padding-left: 1.2rem; }

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.75rem 0; padding: 0; list-style: none; }
.chips li {
  border: 2px solid var(--c, var(--blue));
  background: color-mix(in srgb, var(--c, var(--blue)) 15%, transparent);
  border-radius: 0.5rem;
  padding: 0.1rem 0.6rem;
  font-weight: 700;
}
.note { color: var(--muted); font-size: 0.9rem; }

.steps { counter-reset: s; list-style: none; padding: 0; display: grid; gap: 0.5rem; }
.steps li { counter-increment: s; display: flex; gap: 0.6rem; align-items: baseline; }
.steps li::before { content: counter(s) "."; color: var(--purple); font-weight: 700; }

blockquote {
  margin: 0.75rem 0;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--yellow);
  background: var(--panel);
  text-wrap: pretty;
}
blockquote footer { color: var(--muted); font-size: 0.9rem; margin-top: 0.4rem; }

.remember {
  margin-block: 2rem;
  padding: 1.25rem 1.25rem 1.4rem;
  border: 3px solid var(--yellow);
  border-radius: 0.25rem;
}
.remember strong { display: block; color: var(--red); font-size: 0.85rem; letter-spacing: 0.08em; text-transform: uppercase; }
.remember p { margin: 0.4rem 0 0; font-size: 1.3rem; font-weight: 700; text-wrap: balance; }

.next { color: var(--muted); }
.next b { color: var(--ink); }

.sources { font-size: 0.9rem; color: var(--muted); border-top: 1px solid var(--line); padding-top: 1rem; }
.sources ul { padding-left: 1.2rem; }

/* lesson list */
.lessons { list-style: none; padding: 0; display: grid; gap: 0.75rem; margin-top: 1.5rem; }
.lessons a {
  display: flex; gap: 1rem; align-items: baseline;
  padding: 1rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  text-decoration: none;
  color: var(--ink);
}
.lessons a:hover { border-color: var(--yellow); color: var(--ink); }
.lessons .n { font-family: "Caveat", cursive; font-size: 2rem; line-height: 1; color: var(--yellow); flex: none; }
.lessons .t { font-weight: 700; display: block; }
.lessons .d { color: var(--muted); font-size: 0.95rem; }
.soon { color: var(--muted); font-size: 0.95rem; margin-top: 1rem; }

footer.site { border-top: 1px solid var(--line); padding-block: 1.5rem; color: var(--muted); font-size: 0.9rem; }

/* nested umbrellas: AI ⊃ ML ⊃ LLM */
.nest { margin: 1rem 0; font-weight: 700; }
.nest div { border: 2px solid var(--c); border-radius: 0.75rem; padding: 0.5rem 0.75rem 0.75rem; color: var(--c); }
.nest div div { margin-top: 0.5rem; }
.nest span { display: block; font-weight: 400; font-size: 0.85rem; color: var(--muted); }

/* worked example: next-token probabilities */
.example { background: var(--panel); border: 1px solid var(--line); border-radius: 0.5rem; padding: 1rem; margin: 1rem 0; }
.example .prompt { font-size: 1.15rem; margin: 0 0 0.75rem; }
.example .prompt b { color: var(--yellow); }
.bars { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.35rem; }
.bars li { display: grid; grid-template-columns: 4.5rem 1fr 3rem; gap: 0.5rem; align-items: center; font-size: 0.95rem; }
.bars .bar { height: 0.8rem; border-radius: 0.4rem; background: var(--blue); width: var(--p); }
.bars li:first-child .bar { background: var(--yellow); }
.bars .p { color: var(--muted); text-align: right; }

dl.glossary { display: grid; gap: 0.6rem; }
dl.glossary dt { font-weight: 700; color: var(--yellow); }
dl.glossary dd { margin: 0; text-wrap: pretty; }

.quiz details { background: var(--panel); border: 1px solid var(--line); border-radius: 0.5rem; padding: 0.75rem 1rem; margin-bottom: 0.5rem; }
.quiz summary { cursor: pointer; font-weight: 700; }
.quiz details[open] summary { color: var(--yellow); margin-bottom: 0.4rem; }