/* Static SEO pages: lesson articles, lesson index, glossary (generated by seo/plugin.ts). */
:root {
  --bg: #f4f7f9; --panel: #fff; --panel-2: #eef3f6; --text: #13232e; --muted: #5b6f7c;
  --line: #d8e1e7; --accent: #0e7490; --accent-2: #f59e0b; --ok: #16a34a;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b141a; --panel: #121e26; --panel-2: #192833; --text: #e3edf2; --muted: #8ea3b0;
    --line: #26394a; --accent: #22b8cf; --accent-2: #fbbf24; --ok: #4ade80;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text); line-height: 1.75; font-size: 16px;
  font-family: system-ui, -apple-system, 'Segoe UI', 'Hiragino Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}
a { color: var(--accent); }
.s-top {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; padding: 10px 16px;
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.s-brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 18px; text-decoration: none; }
.s-nav { display: flex; gap: 14px; flex: 1; }
.s-nav a { text-decoration: none; font-weight: 600; color: var(--text); }
.s-langs { font-size: 14px; color: var(--muted); }
.s-main { max-width: 760px; margin: 0 auto; padding: 20px 16px 40px; }
.s-crumbs { font-size: 13px; color: var(--muted); }
.s-crumbs a { color: var(--muted); }
.s-kicker { margin: 16px 0 0; color: var(--accent); font-weight: 700; }
h1 { margin: 4px 0 8px; font-size: clamp(26px, 6vw, 36px); line-height: 1.25; }
h2 { margin: 32px 0 8px; font-size: 22px; }
h3 { margin: 0 0 6px; font-size: 18px; }
.s-lead { font-size: 18px; color: var(--muted); margin: 0 0 16px; }
.s-cta {
  display: inline-block; margin: 6px 0; padding: 10px 18px; border-radius: 999px;
  background: var(--accent); color: #fff; font-weight: 700; text-decoration: none;
}
.s-step { margin: 14px 0; padding: 14px 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.s-step p { margin: 0; }
.s-fig { display: block; width: 100%; height: auto; margin: 6px 0 10px; border-radius: 10px; background: var(--panel-2); }
.s-quiz { margin-top: 10px; padding: 8px 12px; border-radius: 10px; background: var(--panel-2); font-size: 15px; }
.s-quiz ul { margin: 4px 0 0; padding-left: 20px; }
.s-quiz li.ok { font-weight: 700; }
.s-quiz li span { color: var(--ok); font-size: 13px; }
.s-pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.s-toc { padding-left: 22px; }
.s-toc li { margin: 8px 0; }
.s-toc a { display: flex; flex-direction: column; text-decoration: none; }
.s-toc span { color: var(--muted); font-size: 14px; }
.s-gloss dt { margin-top: 14px; font-weight: 800; }
.s-gloss dt small { margin-left: 10px; font-weight: 400; color: var(--muted); font-size: 13px; }
.s-gloss dd { margin: 2px 0 0; }
.s-foot { max-width: 760px; margin: 0 auto; padding: 16px 16px 40px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); }
@media (max-width: 600px) {
  .s-nav { order: 3; flex-basis: 100%; gap: 16px; }
  .s-nav a { white-space: nowrap; }
  .s-langs { margin-left: auto; }
}
.s-quiz .s-q { margin: 2px 0 0; font-weight: 600; }