/* Neuro Notes — single stylesheet. Design borrows the Gas Notes recipe:
   one narrow column, big serif body text, sans headings, a coloured sticky header,
   rounded callouts, and a dark mode driven purely by prefers-color-scheme. */

:root {
  --accent: #5b4bb5;
  --accent-dark: #3f3488;
  --accent-soft: #ede9fb;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #666666;
  --rule: #cfcfcf;
  --rule-soft: #e6e6e6;
  --card: #f6f5fb;
  --green: #2e9e5b;
  --red: #d64541;
  --yellow: #e0a800;
  --link: var(--accent);
  --link-hover: var(--accent-dark);
  --serif: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, Menlo, Consolas, "DejaVu Sans Mono", monospace;
  --wrap: 800px;
  --radius: 0.7rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #4a3f99;
    --accent-dark: #6a5ccf;
    --accent-soft: #2a2545;
    --bg: #111517;
    --fg: #f2f2f2;
    --muted: #a7a7a7;
    --rule: #3a3f44;
    --rule-soft: #262b2f;
    --card: #1a1f24;
    --link: #a99bf5;
    --link-hover: #c6bbff;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.5;
}

.wrapped {
  width: calc(100vw - 2rem);
  max-width: var(--wrap);
  margin: 0 auto;
}

/* ---- Text ---- */
p, li, dt, dd, label, input, table, pre, summary {
  font-size: 1.25rem;
  line-height: 1.55;
}
@media (min-width: 600px) {
  p, li, dt, dd, label, input, table, pre, summary { font-size: 1.35rem; }
}
li > p { margin: 0.3em 0; }
code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--rule-soft);
  padding: 0.1em 0.35em;
  border-radius: 0.3em;
}
pre {
  overflow-x: auto;
  padding: 1rem;
  background: var(--rule-soft);
  border-radius: var(--radius);
}
pre code { background: none; padding: 0; }

a { color: var(--link); }
a:hover { color: var(--link-hover); text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--sans);
  line-height: 1.2;
  clear: both;
  overflow-wrap: anywhere;
}
h1 { font-size: 2.1rem; margin: 1.2em 0 0.4em; }
main > article > h1:first-of-type,
main > article > .breadcrumb + h1 { margin-top: 0.8em; }
main h1 { border-bottom: 2px solid var(--rule); padding-bottom: 0.25em; }
h2 { font-size: 1.6rem; margin: 1.6em 0 0.5em; }
h3 { font-size: 1.25rem; margin: 1.4em 0 0.4em; }
h2 a.headerlink, h3 a.headerlink { display: none; }

.lede { color: var(--muted); font-style: italic; margin-top: 0; }
.muted { color: var(--muted); font-size: 1rem; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2em 0; }

blockquote {
  margin: 1em 0;
  padding: 0 1rem;
  border-left: 3px solid var(--rule);
  color: var(--muted);
}

/* ---- Tables ---- */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
  border: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 1.05rem;
}
th, td { padding: 0.6rem 0.75rem; text-align: left; vertical-align: top; border: 1px solid var(--rule); }
th { background: var(--accent); color: #fff; font-weight: bold; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 1em 0; }
.table-scroll table { margin: 0; min-width: 100%; }
.table-scroll td, .table-scroll th { min-width: 7rem; }

/* ---- Admonitions (markdown `!!! note "Title"`) ---- */
.admonition {
  background: var(--accent);
  color: #fff;
  border-radius: 1.2rem;
  padding: 0.6rem 1.4rem;
  margin: 1.2em 0;
  font-family: var(--sans);
}
.admonition p { font-size: 1.15rem; }
.admonition a { color: #fff; }
.admonition code { background: rgba(255, 255, 255, 0.2); }
.admonition-title { font-weight: bold; margin: 0.4em 0 0.2em; }
.admonition-title::before { content: "💡 "; }
.admonition.tip { background: var(--green); }
.admonition.tip .admonition-title::before { content: "✅ "; }
.admonition.warning { background: var(--yellow); color: #111; }
.admonition.warning a { color: #111; }
.admonition.warning .admonition-title::before { content: "⚠️ "; }
.admonition.danger { background: var(--red); }
.admonition.danger .admonition-title::before { content: "🚨 "; }
.admonition.todo { background: var(--card); color: var(--fg); border: 2px dashed var(--rule); }
.admonition.todo a { color: var(--link); }
.admonition.todo .admonition-title::before { content: "📝 "; }

/* ---- Badges ---- */
.badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15em 0.6em;
  border-radius: 1em;
  margin: 0 0 0.5em;
  vertical-align: middle;
}
.badge.draft { background: var(--yellow); color: #111; }

/* ---- Images ---- */
main img { max-width: 100%; height: auto; display: block; margin: 1em auto; border-radius: var(--radius); }
figure { margin: 1.5em 0; }
figcaption { font-family: var(--sans); font-size: 0.95rem; color: var(--muted); text-align: center; }
.image-50 { width: 50%; }
.image-75 { width: 75%; }

/* ---- Header / nav ---- */
header {
  background: var(--accent);
  font-family: var(--sans);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}
#navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.2rem;
}
#site-title {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.5rem;
  white-space: nowrap;
}
#navbar-right { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; justify-content: flex-end; }
#navbar-right a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  font-size: 1rem;
  white-space: nowrap;
  padding: 0.3em 0;
  border-bottom: 2px solid transparent;
}
#navbar-right a:hover, #navbar-right a[aria-current="page"] { border-bottom-color: #fff; }
@media (max-width: 480px) {
  #site-title { font-size: 1.25rem; }
  #navbar-right { gap: 0.8rem; }
  #navbar-right a { font-size: 0.9rem; }
}

/* ---- Home cards ---- */
.cards { display: grid; gap: 1rem; margin: 1.5em 0 2.5em; }
.card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.1rem 1.3rem;
  background: var(--card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--fg);
  font-family: var(--sans);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
  transition: transform 120ms ease, box-shadow 120ms ease;
}
.card:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12); color: var(--fg); }
.card-emoji { font-size: 2.4rem; line-height: 1; }
.card-body { display: flex; flex-direction: column; gap: 0.3rem; }
.card-body strong { font-size: 1.3rem; }
.card-cta { color: var(--link); font-weight: bold; margin-top: 0.3rem; }

/* ---- Section index ---- */
.chapter-group h3 { margin-top: 1.4em; border-bottom: 1px solid var(--rule-soft); padding-bottom: 0.2em; }
.chapter-list { padding-left: 1.4em; }
.chapter-list li { margin: 0.5em 0; }
.chapter-list a { font-family: var(--sans); font-weight: bold; text-decoration: none; }
.chapter-list a:hover { text-decoration: underline; }
.chapter-desc { display: block; color: var(--muted); font-size: 1.05rem; }
.chapter-list .badge { margin: 0 0 0 0.4em; }

/* ---- Chapter chrome ---- */
.breadcrumb { font-family: var(--sans); font-size: 1rem; margin: 1.2em 0 0; }
.breadcrumb a { text-decoration: none; }
.toc {
  font-family: var(--sans);
  background: var(--card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  margin: 1.2em 0 1.8em;
}
.toc summary { cursor: pointer; font-weight: bold; font-size: 1rem; }
.toc ol { margin: 0.5em 0 0.3em; padding-left: 1.4em; }
.toc li { font-size: 1.05rem; margin: 0.25em 0; }
.toc a { text-decoration: none; }

.pagination {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 3em 0 1em;
  font-family: var(--sans);
}
.pill {
  display: inline-block;
  padding: 0.6em 1.2em;
  border-radius: 2em;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  box-shadow: 0 2px 0 var(--accent-dark);
}
.pill:hover { color: #fff; text-decoration: none; background: var(--accent-dark); }
.pill.next { margin-left: auto; }

/* ---- Footer ---- */
footer {
  margin-top: 3em;
  padding: 1.5em 0 2em;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
}
footer p { font-size: 1rem; margin: 0.4em 0; }

/* ---- Print ---- */
@media print {
  .noprint { display: none !important; }
  body { font-size: 11pt; }
  .admonition { border: 1px solid #000; background: none !important; color: #000 !important; }
}