/* Joyous Brands · AI learning series. Palette and type match the joyousbrands.com homepage. */
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500;600&display=swap');
:root {
  --bg: #FAF9F7;
  --surface: #ffffff;
  --ink: #1A1A18;
  --ink-2: #3A3A38;
  --rule: #E8E6DF;
  --accent: #D85A30;
  --accent-ink: #ffffff;
  --accent-hover: #C24A23;
  --code-bg: #f2f0ea;
  --max: 1120px;
  --prose: 70ch;

  /* tokens the diagrams use */
  --cds-text-primary: var(--ink);
  --cds-text-secondary: var(--ink-2);
  --cds-text-tertiary: #8A8985;
  --cds-chart-axis: #b9b5ab;
  --cds-chart-grid: #e8e5dd;
  --cds-surface-primary: var(--surface);
  --cds-surface-secondary: #f4f2ec;
  --cds-border-primary: var(--rule);
  --cds-chart-categorical-1: #D85A30;
  --cds-chart-categorical-2: #1D9E75;
  --cds-chart-categorical-3: #4a6fa5;
  --cds-chart-categorical-4: #a3812c;
  --cds-chart-categorical-5: #8a5a9e;
  --cds-chart-categorical-6: #4f8a8b;
  --cds-chart-positive: #2f7d4a;
  --cds-chart-negative: #b3423a;
  --cds-chart-neutral: #8a877f;
  --cds-chart-status-good: #2f7d4a;
  --cds-chart-status-warning: #b07d12;
  --cds-chart-status-critical: #b3423a;
  --cds-chart-reference-tint: #ece9e1;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161614;
    --surface: #1e1e1b;
    --ink: #ecebe6;
    --ink-2: #aeaba3;
    --rule: #34332f;
    --accent: #E8825C;
    --accent-ink: #1A1A18;
    --accent-hover: #F09A78;
    --code-bg: #24241f;
    --cds-text-tertiary: #85827a;
    --cds-chart-axis: #6c6a63;
    --cds-chart-grid: #2e2d29;
    --cds-surface-secondary: #252521;
    --cds-chart-categorical-1: #E8825C;
    --cds-chart-categorical-2: #5CC8A0;
    --cds-chart-categorical-3: #8fb0e0;
    --cds-chart-categorical-4: #d9b65e;
    --cds-chart-categorical-5: #c39ad6;
    --cds-chart-categorical-6: #86c2c3;
    --cds-chart-positive: #74c08f;
    --cds-chart-negative: #e8857d;
    --cds-chart-status-good: #74c08f;
    --cds-chart-status-warning: #e0b04c;
    --cds-chart-status-critical: #e8857d;
    --cds-chart-reference-tint: #2b2a26;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 16px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.7 "DM Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
/* Homepage headings: DM Serif Display, single weight, slightly tight. */
h1, h2, h3 { font-family: "DM Serif Display", Georgia, serif; font-weight: 400; color: var(--ink); }
h1 em, h2 em, .brand em { color: var(--accent); font-style: italic; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

.site-head { border-bottom: 1px solid var(--rule); background: var(--surface); }
.head-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; flex-wrap: wrap; }
.brand { font-family: "DM Serif Display", Georgia, serif; font-size: 22px; font-weight: 400; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.crumbs { display: flex; gap: 8px; flex-wrap: wrap; font-size: 14px; color: var(--ink-2); }
.crumbs a { color: var(--ink-2); }
.site-foot { border-top: 1px solid var(--rule); margin-top: 64px; padding: 24px 0; font-size: 14px; color: var(--ink-2); }
.site-foot a { color: var(--ink-2); }

/* index */
.hero { padding: 48px 0 16px; max-width: 760px; }
.hero h1 { font-size: clamp(36px, 5.5vw, 56px); line-height: 1.08; letter-spacing: -0.015em; margin: 0 0 16px; }
.lede { font-size: 18px; font-weight: 300; color: var(--ink-2); max-width: var(--prose); }
.jump { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.series { padding: 40px 0 8px; border-top: 1px solid var(--rule); margin-top: 32px; }
.series h2 { font-size: clamp(28px, 3.6vw, 40px); line-height: 1.15; letter-spacing: -0.01em; margin: 4px 0 12px; }
.series h3 { margin: 28px 0 8px; font-size: 22px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.22em; font-size: 11px; font-weight: 500; color: var(--accent); margin: 0; }
.how { padding-left: 20px; max-width: var(--prose); }
.how li { margin: 4px 0; }
.button { display: inline-block; background: var(--accent); color: var(--accent-ink); padding: 10px 18px; border-radius: 999px; text-decoration: none; font-weight: 500; letter-spacing: 0.02em; margin-top: 8px; }
.button:hover { background: var(--accent-hover); }
table.toc td:first-child { white-space: nowrap; font-weight: 600; }

/* part pages */
.part-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 48px; padding-top: 32px; }
.part-nav { position: sticky; top: 16px; align-self: start; font-size: 14px; }
.part-nav-title { font-weight: 600; margin: 0 0 8px; line-height: 1.35; }
.part-nav-title a { color: var(--ink); text-decoration: none; }
.part-nav ol { list-style: none; padding: 0; margin: 0; border-left: 1px solid var(--rule); }
.part-nav li a { display: block; padding: 4px 12px; color: var(--ink-2); text-decoration: none; margin-left: -1px; border-left: 2px solid transparent; }
.part-nav li a:hover { color: var(--ink); }
.part-nav li[aria-current="page"] a { color: var(--accent); border-left-color: var(--accent); font-weight: 600; }
@media (max-width: 860px) {
  .part-layout { grid-template-columns: 1fr; gap: 16px; padding-top: 20px; }
  .part-nav { position: static; }
  .part-nav ol { display: flex; flex-wrap: wrap; gap: 4px; border: 0; }
  .part-nav li a { border: 1px solid var(--rule); border-radius: 999px; padding: 2px 10px; margin: 0; }
  .part-nav li[aria-current="page"] a { border-color: var(--accent); }
}

.prose { max-width: var(--prose); min-width: 0; }
.prose h1 { font-size: clamp(32px, 4.8vw, 46px); line-height: 1.12; letter-spacing: -0.015em; margin: 6px 0 20px; }
.prose h2 { font-size: 30px; line-height: 1.2; letter-spacing: -0.01em; margin: 44px 0 12px; padding-top: 8px; }
.prose h3 { font-size: 22px; margin: 28px 0 8px; }
.prose p, .prose li { overflow-wrap: anywhere; }
.prose li > p { margin: 4px 0; }
.prose ul, .prose ol { padding-left: 22px; }
.prose code { font: 0.88em/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
.prose pre { background: var(--code-bg); border: 1px solid var(--rule); border-radius: 8px; padding: 14px 16px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; font-size: 14px; }
.prose blockquote { margin: 16px 0; padding: 4px 16px; border-left: 3px solid var(--accent); color: var(--ink-2); }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 32px 0; }

.table-wrap { overflow-x: auto; margin: 16px 0; border: 1px solid var(--rule); border-radius: 8px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 9px 12px; border-bottom: 1px solid var(--rule); }
tr:last-child td { border-bottom: 0; }
th { font-weight: 600; background: var(--cds-surface-secondary); }

.fig { margin: 20px 0; padding: 12px; border: 1px solid var(--rule); border-radius: 10px; background: var(--surface); overflow-x: auto; }
.fig-svg { display: block; width: 100%; height: auto; min-width: 520px; font-family: inherit; }

.math-block { overflow-x: auto; overflow-y: hidden; margin: 16px 0; padding: 4px 0; }

.byline { font-size: 14px; color: var(--ink-2); margin: -8px 0 24px; }
.hero .byline { margin: 0 0 16px; }
.byline a { color: var(--ink-2); }

/* ad slots: hidden until ads.js turns them on */
.ad-slot { display: none; }
.ad-slot.ad-on { display: block; margin: 32px 0; padding: 8px 0 12px; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); min-height: 120px; }
.ad-label { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--cds-text-tertiary); margin-bottom: 6px; }

.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--rule); }
.pager a { display: block; padding: 12px 14px; border: 1px solid var(--rule); border-radius: 8px; text-decoration: none; color: var(--ink); background: var(--surface); font-weight: 600; font-size: 15px; }
.pager a span { display: block; font-size: 12px; font-weight: 500; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.06em; }
.pager a:hover { border-color: var(--accent); }
.pager .next { text-align: right; }
@media (max-width: 520px) { .pager { grid-template-columns: 1fr; } .pager .next { text-align: left; } }

/* runnable Python examples (py-runner.js) */
.py-run { margin: 16px 0; }
.py-run pre { margin: 0; }
.py-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 8px; }
.py-btn { font: 500 14px/1 "DM Sans", ui-sans-serif, system-ui, sans-serif; padding: 8px 14px; border-radius: 999px; border: 1px solid var(--rule); background: var(--surface); color: var(--ink); cursor: pointer; }
.py-btn:hover { border-color: var(--accent); }
.py-btn-run { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.py-btn-run:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.py-btn:disabled { opacity: 0.6; cursor: progress; }
.py-btn[hidden] { display: none; }
.py-status { font-size: 13px; color: var(--ink-2); }
.py-editor { display: block; width: 100%; min-height: 200px; resize: vertical; font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; tab-size: 4; background: var(--code-bg); color: var(--ink); border: 1px solid var(--accent); border-radius: 8px; padding: 14px 16px; white-space: pre; overflow: auto; }
.py-out { margin-top: 8px !important; max-height: 420px; overflow: auto; background: var(--surface) !important; font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: pre-wrap; }
.py-out .py-stderr { color: var(--cds-chart-negative); }
.py-jump { font-weight: 500; white-space: nowrap; }
.py-out { scroll-margin-top: 16px; }
.py-out:focus { outline: none; }
.py-out.py-flash { animation: py-flash 1.6s ease-out; }
@keyframes py-flash { from { box-shadow: 0 0 0 3px var(--accent); } to { box-shadow: 0 0 0 3px transparent; } }
@media (prefers-reduced-motion: reduce) { .py-out.py-flash { animation: none; } }