:root {
  color-scheme: dark;
  --bg: #16121f;
  --panel: #221b31;
  --text: #efeaff;
  --muted: #beb5d3;
  --accent: #b5a3ff;
  --gold: #f0a13c;
  --line: #453854;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.7 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { color: var(--text); }
:focus-visible { outline: 2px solid #75e5c6; outline-offset: 3px; }
[id] { scroll-margin-top: 1.25rem; }
.frame { width: min(100% - 2rem, 64rem); margin-inline: auto; }
.site-nav, .site-footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem 1.5rem;
  padding-block: 1rem;
}
.site-nav .brand { color: var(--text); font-weight: 750; text-decoration: none; }
.site-nav .brand span { color: var(--accent); }
.hero {
  background: linear-gradient(140deg, #2a2044, var(--bg) 74%);
  border-block: 1px solid var(--line);
  padding-block: clamp(2.5rem, 6vw, 5.25rem);
}
.part-number, .chapter-number {
  margin: 0 0 .4rem;
  color: var(--gold);
  font-size: .83rem;
  font-weight: 750;
  letter-spacing: .09em;
  text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.2; }
h1 { margin: 0; max-width: 19ch; font-size: clamp(2.4rem, 7vw, 4.3rem); }
h2 { margin: 0 0 1rem; font-size: clamp(1.7rem, 4vw, 2.25rem); }
h3 { margin: 1.75rem 0 .65rem; font-size: 1.2rem; }
p { margin-block: .75rem; }
.lead { max-width: 56ch; color: var(--muted); font-size: 1.14rem; }
.primary-link {
  display: inline-block;
  margin-top: .6rem;
  padding: .52rem .9rem;
  border-radius: .5rem;
  background: #4b2fd6;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}
.primary-link:hover { background: #5a3de7; }
.reading-layout {
  display: grid;
  grid-template-columns: minmax(11rem, 14rem) minmax(0, 44rem);
  align-items: start;
  gap: 2rem clamp(1.5rem, 4vw, 3.5rem);
  padding-block: 2rem 3rem;
}
.contents {
  position: sticky;
  top: 1rem;
  padding: .9rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: var(--panel);
}
.contents h2 { font-size: 1.07rem; margin: .15rem 0 .55rem; }
.contents ol { margin: 0; padding-left: 1.35rem; }
.contents a { display: block; padding-block: .24rem; }
.chapter + .chapter { margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.sequence { font-weight: 700; }
.note, .listen, .practice {
  margin: 1.1rem 0;
  padding: .85rem 1rem;
  background: var(--panel);
  border-radius: .65rem;
}
.note, .practice { border-inline-start: .22rem solid var(--gold); }
.listen { border: 1px solid var(--line); }
.listen strong { display: block; }
.listen audio { display: block; width: min(100%, 25rem); margin-top: .65rem; }
.note p:last-child, .practice p:last-child, details p:last-child { margin-bottom: 0; }
.practice h3 { margin: 0 0 .55rem; font-size: 1.05rem; }
.practice ol { padding-left: 1.35rem; margin-block: .4rem; }
summary { color: var(--accent); cursor: pointer; padding-block: .2rem; }
table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .96rem; }
caption { text-align: left; font-weight: 700; margin-bottom: .35rem; }
th, td { padding: .42rem .6rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
thead th { background: var(--panel); }
.sources { border-top: 1px solid var(--line); padding-top: 1.25rem; margin-top: 2rem; color: var(--muted); }
.sources h2 { font-size: 1.15rem; }
.sources ul { padding-left: 1.35rem; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
@media (max-width: 760px) {
  .reading-layout { grid-template-columns: minmax(0, 1fr); }
  .contents { position: static; }
}
@media (max-width: 380px) {
  th, td { padding-inline: .3rem; font-size: .875rem; }
}