.reader { display: grid; grid-template-columns: 1fr; gap: 0; }
@media (min-width: 1080px) {
  .reader { grid-template-columns: 1fr 248px; gap: 56px; align-items: start; }
}

.reader__main { min-width: 0; max-width: var(--measure); }

.reader__head { margin-bottom: 34px; }
.breadcrumb { display: flex; align-items: center; gap: 10px; font-size: var(--fs-sm); color: var(--muted); margin-bottom: 18px; }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb span { color: var(--faint); }
.reader__title { font-size: var(--fs-h1); margin-bottom: 14px; }
.reader__lead { font-family: var(--serif); font-style: italic; font-size: var(--fs-lead); color: var(--muted); max-width: 60ch; margin-bottom: 18px; }
.reader__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; color: var(--faint); font-size: var(--fs-sm); }

/* ── Tabs (Конспект / Саммари) ──────────────────────────────── */
.tabs { display: inline-flex; gap: 4px; padding: 5px; border-radius: 999px; border: 1px solid var(--line-soft); background: var(--panel); margin: 28px 0 8px; }
.tab {
  position: relative;
  padding: 9px 22px;
  border-radius: 999px;
  font-size: var(--fs-sm); font-weight: 600;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}
.tab.is-active { color: var(--void); }
.tab__bg {
  position: absolute; inset: 0; z-index: -1;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--gold-bright), var(--gold-deep));
  opacity: 0; transform: scale(0.9);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
.tab.is-active .tab__bg { opacity: 1; transform: scale(1); }

.tab-panel { display: none; }
.tab-panel.is-active { display: block; animation: tab-in 0.5s var(--ease-out); }

/* ── Prose typography ───────────────────────────────────────── */
.prose { font-size: 1.075rem; line-height: 1.82; color: var(--text); }
.prose > * + * { margin-top: 1.15em; }
.prose h2 {
  font-size: var(--fs-h2);
  margin: 2em 0 0.7em;
  padding-top: 0.4em;
  scroll-margin-top: 90px;
  position: relative;
}
.prose h2::before {
  content: "";
  position: absolute; top: -0.1em; left: 0;
  width: 42px; height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}
.prose h3 { font-size: var(--fs-h3); margin: 1.6em 0 0.5em; color: var(--gold-bright); scroll-margin-top: 90px; }
.prose p { color: var(--text); }
.prose strong { color: var(--ink); font-weight: 700; }
.prose em { color: var(--gold-bright); }
.prose a { color: var(--gold); border-bottom: 1px solid var(--gold-dim); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: 0.5em 0; }
.prose li::marker { color: var(--gold); }
.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 24px;
  border-left: 2px solid var(--gold);
  color: var(--muted); font-style: italic; font-family: var(--serif);
}
.prose code {
  font-family: ui-monospace, monospace; font-size: 0.9em;
  padding: 2px 7px; border-radius: 6px;
  background: var(--panel-hi); color: var(--gold-bright);
}
.prose hr { border: none; height: 1px; background: var(--line); margin: 2.4em 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: var(--fs-sm); }
.prose th, .prose td { padding: 10px 14px; border-bottom: 1px solid var(--line-soft); text-align: left; }
.prose th { color: var(--gold); font-family: var(--sans); }

/* Drop cap on the first paragraph of each panel */
.prose--lead > p:first-of-type::first-letter {
  font-family: var(--serif);
  font-size: 3.4em;
  float: left;
  line-height: 0.8;
  padding: 0.08em 0.12em 0 0;
  color: var(--gold-bright);
  text-shadow: 0 0 30px rgba(201, 169, 106, 0.4);
}

/* ── Sticky table of contents ───────────────────────────────── */
.toc { position: sticky; top: 40px; display: none; }
@media (min-width: 1080px) { .toc { display: block; } }
.toc__title { font-size: var(--fs-xs); letter-spacing: 0.22em; text-transform: uppercase; color: var(--faint); margin-bottom: 14px; }
.toc__list { display: flex; flex-direction: column; gap: 2px; border-left: 1px solid var(--line-soft); }
.toc__link {
  padding: 7px 0 7px 16px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: var(--fs-sm); color: var(--muted); line-height: 1.4;
  transition: color 0.25s, border-color 0.25s;
}
.toc__link:hover { color: var(--text); }
.toc__link.is-active { color: var(--gold); border-left-color: var(--gold); }
.toc__link--sub { padding-left: 30px; font-size: var(--fs-xs); }

/* ── Prev / next + mark read ────────────────────────────────── */
.reader__actions { margin: 40px 0 8px; }
.lesson-nav {
  display: grid; gap: 14px; margin-top: 48px;
  grid-template-columns: 1fr 1fr;
  padding-top: 28px; border-top: 1px solid var(--line-soft);
}
.lesson-nav__link {
  display: flex; flex-direction: column; gap: 4px;
  padding: 18px 22px; border-radius: var(--r);
  border: 1px solid var(--line-soft);
  transition: border-color 0.3s, transform 0.3s, background 0.3s;
}
.lesson-nav__link:hover { border-color: var(--gold-dim); transform: translateY(-3px); background: var(--panel); }
.lesson-nav__link--next { text-align: right; align-items: flex-end; }
.lesson-nav__dir { font-size: var(--fs-xs); letter-spacing: 0.16em; text-transform: uppercase; color: var(--gold); }
.lesson-nav__name { font-family: var(--serif); color: var(--ink); }
.lesson-nav__spacer { }

@media (max-width: 620px) { .lesson-nav { grid-template-columns: 1fr; } }