/* Reading experience — desktop + mobile a11y */
:root {
  --bg: #f7f4ef;
  --ink: #1c1917;
  --muted: #78716c;
  --card: #fff;
  --accent: #0f766e;
  --warn: #b45309;
  --border: #e7e5e4;
  --focus: #2563eb;
}
* { box-sizing: border-box; }
body.rx-page {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}
body.font-sm { font-size: 15px; }
body.font-md { font-size: 17px; }
body.font-lg { font-size: 19px; }
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--focus); color: #fff; padding: 0.5rem 1rem; z-index: 10;
}
.skip-link:focus { left: 0; }
.rx-header, .rx-footer, .rx-main, .rx-layout { padding: 1rem 1.25rem; }
.brand-slogan { color: var(--muted); font-size: 0.9rem; }
.rx-layout {
  display: grid;
  grid-template-columns: minmax(180px, 240px) minmax(0, 1fr) minmax(180px, 260px);
  gap: 1rem;
  align-items: start;
}
.rx-toc, .rx-rail aside, .rx-card, .rx-article, .rx-media {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.85rem 1rem;
}
.rx-toc ol { padding-left: 1.1rem; }
.rx-toc a { color: var(--accent); text-decoration: none; }
.rx-toc a:focus, a:focus, button:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
.rx-summary { font-size: 1.05rem; color: #44403c; }
.rx-section { margin: 1rem 0; }
.rx-h { font-size: 1.2rem; scroll-margin-top: 4rem; }
.rx-p { scroll-margin-top: 4rem; }
.muted { color: var(--muted); }
.warn { color: var(--warn); font-weight: 600; }
.btn {
  appearance: none; border: 1px solid var(--accent); background: var(--accent);
  color: #fff; border-radius: 8px; padding: 0.45rem 0.9rem; cursor: pointer;
}
.rx-cards { list-style: none; padding: 0; display: grid; gap: 0.75rem; }
.rx-card .card-title { font-weight: 600; color: var(--ink); }
.badge {
  display: inline-block; margin-right: 0.35rem; padding: 0.1rem 0.45rem;
  border-radius: 999px; background: #ecfdf5; color: #065f46; font-size: 0.75rem;
}
.rx-banner {
  margin: 0 1.25rem; padding: 0.6rem 0.9rem; background: #fff7ed;
  border: 1px solid #fed7aa; border-radius: 8px;
}
.cover-ph {
  height: 140px; display: grid; place-items: center; background: #e7e5e4;
  border-radius: 8px; color: var(--muted);
}
.rx-search { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: end; margin-bottom: 1rem; }
.rx-search input {
  min-width: min(100%, 280px); padding: 0.45rem 0.6rem; border-radius: 8px; border: 1px solid var(--border);
}
.rx-notes.owner-only { border-color: #fca5a5; background: #fff1f2; }

@media (max-width: 900px) {
  .rx-layout { grid-template-columns: 1fr; }
  body.toc-collapsed-mobile .rx-toc ol { display: none; }
  body.toc-collapsed-mobile .rx-toc::after {
    content: "（小屏目录默认折叠；点击标题区链接仍可从验收入口进入锚点）";
    color: var(--muted); font-size: 0.85rem;
  }
}