/* Article-only navigation. A real grid column reserves space for the TOC;
 * widening a fixed rail outside the old centered #main would cover the text.
 */
#wrapper.post-page-wrapper {
  /* clip, unlike hidden, does not create a scroll container that traps sticky. */
  overflow: visible;
  overflow-x: clip;
}

/* Override the theme's #main > * padding without giving display a stronger
 * selector than the desktop grid rule below. Keep both display rules scoped
 * consistently so the sidebar always has its own column when it is sticky.
 */
#main.post-page-main > .post-content-shell { padding: 0; }
.post-page-main .post-content-shell { display: block; }
.post-page-main .post-toc-sidebar {
  display: block;
  position: static;
  inset: auto;
  width: auto;
  min-width: 0;
  max-height: none;
  margin: 20px 20px 0;
  overflow: visible;
  z-index: auto;
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
.post-page-main .post-toc-sidebar[hidden] { display: none !important; }
.post-page-main .post-toc-card {
  display: block;
  padding: 0;
  border: 1px solid #dce4e7;
  border-radius: 8px;
  background: #f8fafb;
  box-shadow: none;
  backdrop-filter: none;
}
.post-page-main .post-toc-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  margin: 0;
  padding: 12px 14px;
  color: #263b46;
  font: inherit;
  font-weight: 600;
  letter-spacing: normal;
  list-style: none;
  cursor: pointer;
}
.post-page-main .post-toc-title::-webkit-details-marker { display: none; }
.post-page-main .post-toc-toggle-label { color: #657780; font-size: 12px; font-weight: 400; }
.post-page-main .post-toc-toggle-label::after { content: "展开 ＋"; }
.post-page-main .post-toc-card[open] .post-toc-toggle-label::after { content: "收起 −"; }
.post-page-main .post-toc-nav {
  min-height: 0;
  max-height: min(52vh, 420px);
  padding: 0 8px 4px;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: #aebfc7 transparent;
}
.post-page-main .post-toc-list { margin: 0; padding: 0; list-style: none; }
.post-page-main .post-toc-item { margin: 0; padding: 0; }
.post-page-main .post-toc-item[data-depth="1"] { padding-left: 12px; }
.post-page-main .post-toc-item[data-depth="2"] { padding-left: 24px; }
.post-page-main .post-toc-link {
  display: block;
  min-width: 0;
  margin: 2px 0;
  padding: 8px 10px;
  border: 0;
  border-radius: 4px;
  color: #4b606b;
  font: inherit;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: normal;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: normal;
  text-decoration: none;
  transform: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.post-page-main .post-toc-link:hover { background: #eaf0f4; color: #254d64; transform: none; }
.post-page-main .post-toc-link.is-active {
  background: #e3f0f5;
  color: #125879;
  font-weight: 500;
  box-shadow: inset 3px 0 0 #3786a9;
}
.post-page-main .post-toc-top-button {
  display: block;
  position: static;
  width: auto;
  max-width: calc(100% - 24px);
  height: auto;
  min-height: 36px;
  margin: 8px 12px 12px auto;
  padding: 6px 10px;
  border: 1px solid #d2dee4;
  border-radius: 4px;
  background: #fff;
  color: #4c6675;
  box-shadow: none;
  font: inherit;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: normal;
  text-transform: none;
  cursor: pointer;
  transform: none;
}
.post-page-main .post-toc-top-button:hover { background: #eaf0f4; color: #254d64 !important; box-shadow: none; transform: none; }
.post-page-main :is(.post-toc-title, .post-toc-nav, .post-toc-link, .post-toc-top-button):focus-visible { outline: 2px solid #3786a9; outline-offset: 2px; }

@media (min-width: 1180px) {
  #main.post-page-main.has-post-toc,
  #wrapper.post-page-wrapper.has-post-toc > #nav {
    width: calc(100% - 48px);
    max-width: calc(72rem + 340px);
  }
  .post-page-main .post-content-shell.has-post-toc {
    display: grid;
    grid-template-columns: calc(clamp(280px, 22vw, 320px) + 20px) minmax(0, 1fr);
    align-items: start;
  }
  .post-page-main .post-toc-sidebar {
    position: sticky;
    top: 24px;
    align-self: start;
    margin: 24px 0 24px 20px;
  }
  .post-page-main .post-toc-nav {
    max-height: calc(100vh - 160px);
    max-height: calc(100dvh - 160px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .post-page-main .post-toc-link { transition: none; }
}