:root {
  --bg: #f6f4ef; --panel: #ffffff; --panel-2: #f0ede5; --text: #1c2233; --muted: #6b7082; --border: #e2ded4;
  --accent: #e08a00; --accent-soft: #fdf0d9; --link: #2b3a67; --info: #2f7fd1;
  --font: system-ui, -apple-system, "Segoe UI", "Nirmala UI", Roboto, "Noto Sans", "Noto Sans Devanagari", "Noto Sans Bengali",
    "Noto Sans Tamil", "Noto Sans Telugu", "Noto Sans Kannada", "Noto Sans Malayalam", "Noto Sans Gujarati", "Noto Sans Gurmukhi",
    "Noto Sans Oriya", "Noto Nastaliq Urdu", sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1526; --panel: #172036; --panel-2: #1d2842; --text: #e8eaf2; --muted: #97a0b8; --border: #2a3654;
    --accent: #f5a524; --accent-soft: #3a2e14; --link: #f5c46a; --info: #7dd3fc;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1526; --panel: #172036; --panel-2: #1d2842; --text: #e8eaf2; --muted: #97a0b8; --border: #2a3654;
  --accent: #f5a524; --accent-soft: #3a2e14; --link: #f5c46a; --info: #7dd3fc;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.6; }
a { color: var(--link); }
main { max-width: 820px; margin: 0 auto; padding: 8px 16px 40px; }
.top { display: flex; flex-wrap: wrap; gap: 8px 16px; justify-content: space-between; align-items: center; padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--panel); }
.brand { font-weight: 700; text-decoration: none; color: var(--text); }
.app-link { font-size: 0.9rem; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 8px 0; }
h2 { margin-top: 0; }
.lead { font-size: 1.1rem; color: var(--muted); }
.muted { color: var(--muted); }
.crumbs { margin-top: 12px; font-size: 0.9rem; }
.courses, .chapters { list-style: none; padding: 0; display: grid; gap: 12px; }
.courses a, .chapters a { display: grid; gap: 2px; padding: 14px 16px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--text); }
.courses a:hover, .chapters a:hover { border-color: var(--accent); }
.pair { font-size: 1.2rem; }
.toc { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 12px 16px 12px 36px; }
.lesson { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 20px; margin: 20px 0; }
.lesson section { margin-top: 20px; }
.md { overflow-x: auto; }
.md table { border-collapse: collapse; margin: 12px 0; font-size: 0.93rem; }
.md th, .md td { border: 1px solid var(--border); padding: 6px 10px; text-align: start; vertical-align: top; }
.md th { background: var(--panel-2); }
.takeaways { background: var(--accent-soft); border-radius: 10px; padding: 12px 16px; }
.takeaways h3 { margin: 0 0 4px; font-size: 1rem; }
.target { font-weight: 600; overflow-wrap: anywhere; }
.target.big { font-size: 1.25rem; }
.pron { color: var(--info); font-style: italic; }
.say { border: 1px solid var(--border); background: var(--panel-2); color: var(--text); border-radius: 999px; width: 2em; height: 2em; font-size: 0.8rem; cursor: pointer; vertical-align: middle; }
.say:hover { border-color: var(--accent); }
.vocab { display: grid; gap: 10px; margin: 0; }
.vocab > div { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: 4px 16px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.vocab dd { margin: 0; }
.tag { font-size: 0.8rem; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 0 6px; }
.example { margin-top: 6px; padding-inline-start: 10px; border-inline-start: 3px solid var(--accent-soft); }
.lines { list-style: none; padding: 0; display: grid; gap: 10px; }
.lines li { display: grid; grid-template-columns: 7em minmax(0, 1fr); gap: 10px; }
.speaker { font-weight: 600; color: var(--muted); overflow-wrap: anywhere; }
.pitfalls { padding-inline-start: 20px; }
.pitfalls li { margin-bottom: 10px; }
.quiz > li { margin-bottom: 14px; }
.quiz p { margin: 4px 0; }
details summary { cursor: pointer; color: var(--link); }
.pager { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 16px; }
footer { max-width: 820px; margin: 0 auto; padding: 16px; font-size: 0.85rem; color: var(--muted); border-top: 1px solid var(--border); }
@media (max-width: 600px) {
  .vocab > div, .lines li { grid-template-columns: minmax(0, 1fr); }
  h1 { font-size: 1.5rem; }
  .lesson { padding: 16px; }
}