/* Claude Code Nano — handout styling. CS61A-ish: one readable text column,
   monospace code, distinct callout boxes. Light/dark aware. Self-contained. */

:root {
  --bg: #fbfaf7;
  --fg: #1c1b19;
  --muted: #5f5c55;
  --faint: #8a867d;
  --rule: #e4e1d8;
  --link: #9a3b1b;
  --link-hover: #c04a22;
  --code-bg: #f1efe8;
  --code-fg: #2a2822;
  --pre-bg: #262421;
  --pre-fg: #eceae3;
  --hint-bg: #edf3f6;
  --hint-bar: #3f7d9c;
  --hint-fg: #223540;
  --warn-bg: #fdf1ea;
  --warn-bar: #c2622f;
  --warn-fg: #4a2c17;
  --note-bg: #f2f0ea;
  --note-bar: #9a968b;
  --note-fg: #34322c;
  --details-bg: #f4f2ec;
  --details-border: #dcd8cd;
  --table-head: #efece4;
  --accent: #9a3b1b;
  --maxw: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16151a;
    --fg: #e4e2dc;
    --muted: #a8a49b;
    --faint: #7d7970;
    --rule: #302e33;
    --link: #e0995f;
    --link-hover: #f0b47f;
    --code-bg: #26242b;
    --code-fg: #e9d9c6;
    --pre-bg: #0f0e12;
    --pre-fg: #e6e3db;
    --hint-bg: #172a33;
    --hint-bar: #4f97b8;
    --hint-fg: #cfe6ef;
    --warn-bg: #2e1d13;
    --warn-bar: #d67c44;
    --warn-fg: #f0d3bf;
    --note-bg: #211f26;
    --note-bar: #6b6760;
    --note-fg: #ceccc4;
    --details-bg: #1e1c22;
    --details-border: #35323a;
    --table-head: #201e25;
    --accent: #e0995f;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
    "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

/* ---- top bar ---- */
.topbar {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: baseline;
  justify-content: space-between;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.8rem;
}
.brand a { color: var(--fg); font-weight: 700; text-decoration: none; letter-spacing: -0.01em; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--link-hover); }
.crumbs .dot { color: var(--faint); }

/* ---- text column ---- */
.handout {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.4rem 1.25rem 4rem;
}

h1, h2, h3, h4, h5, h6 {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  line-height: 1.2;
  color: var(--fg);
  scroll-margin-top: 3.5rem;
}
h1 {
  font-size: 2.1rem;
  margin: 0 0 0.4rem;
  letter-spacing: -0.015em;
}
h2 {
  font-size: 1.5rem;
  margin: 2.6rem 0 0.9rem;
  padding-bottom: 0.3rem;
  border-bottom: 2px solid var(--rule);
}
h3 {
  font-size: 1.18rem;
  margin: 1.9rem 0 0.6rem;
  color: var(--accent);
}
h4 { font-size: 1.02rem; margin: 1.4rem 0 0.5rem; }

p { margin: 0.85rem 0; }
p.lede { font-size: 1.12rem; color: var(--fg); margin: 1rem 0 1.2rem; }
.tag { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.62em; text-transform: uppercase; letter-spacing: 0.06em; background: var(--accent); color: var(--bg); padding: 0.12em 0.5em; border-radius: 999px; vertical-align: middle; font-weight: 700; }

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--link-hover); }

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

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.2rem 0;
}
hr.end-rule { margin-top: 3rem; }

/* ---- code ---- */
code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.86em;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 0.1em 0.36em;
  border-radius: 4px;
  word-break: break-word;
}
pre {
  background: var(--pre-bg);
  color: var(--pre-fg);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  margin: 1.1rem 0;
  line-height: 1.5;
  font-size: 0.82rem;
  -webkit-overflow-scrolling: touch;
}
pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
  border-radius: 0;
  word-break: normal;
}

/* ---- callouts (blockquotes) ---- */
.callout {
  margin: 1.2rem 0;
  padding: 0.85rem 1.1rem;
  border-left: 4px solid var(--note-bar);
  border-radius: 0 6px 6px 0;
  background: var(--note-bg);
  color: var(--note-fg);
  font-size: 0.95rem;
}
.callout p { margin: 0; }
.callout.hint { border-left-color: var(--hint-bar); background: var(--hint-bg); color: var(--hint-fg); }
.callout.warn { border-left-color: var(--warn-bar); background: var(--warn-bg); color: var(--warn-fg); }
.callout code { background: rgba(128,128,128,0.16); }

/* ---- tables ---- */
.table-wrap { overflow-x: auto; margin: 1.3rem 0; -webkit-overflow-scrolling: touch; }
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
th, td {
  border: 1px solid var(--rule);
  padding: 0.5rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
thead th { background: var(--table-head); font-weight: 700; }
td code, th code { font-size: 0.82em; }

/* ---- lists ---- */
ul, ol { margin: 0.85rem 0; padding-left: 1.6rem; }
li { margin: 0.4rem 0; }
li > ul, li > ol { margin: 0.4rem 0; }

/* ---- appendix spoiler details ---- */
details.appendix-item {
  border: 1px solid var(--details-border);
  border-radius: 8px;
  background: var(--details-bg);
  margin: 0.9rem 0;
  padding: 0 1.1rem;
  scroll-margin-top: 3.5rem;
}
details.appendix-item[open] { padding-bottom: 0.4rem; }
details.appendix-item > summary {
  cursor: pointer;
  padding: 0.85rem 0;
  font-weight: 700;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92rem;
  color: var(--accent);
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
}
details.appendix-item > summary::-webkit-details-marker { display: none; }
details.appendix-item > summary::before {
  content: "\25B8";  /* right triangle */
  color: var(--faint);
  font-size: 0.8em;
  transition: transform 0.15s ease;
  display: inline-block;
}
details.appendix-item[open] > summary::before { transform: rotate(90deg); }
details.appendix-item > summary:hover { color: var(--link-hover); }
.appendix-body { border-top: 1px solid var(--details-border); padding-top: 0.3rem; margin-bottom: 0.4rem; }
.appendix-body > :first-child { margin-top: 0.6rem; }

/* ---- page nav ---- */
.pagenav {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
}
.pagenav a { color: var(--link); text-decoration: none; }
.pagenav a:hover { color: var(--link-hover); text-decoration: underline; }
.pagenav .dot { color: var(--faint); }

@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .handout { padding: 1.8rem 1rem 3rem; }
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.3rem; }
}