/* Isolated reading experience for /duan/**. */
body.duan-experience {
  --duan-bg: #faf8f4;
  --duan-bg-soft: #f3eee8;
  --duan-paper: #fffdf9;
  --duan-fg: #292724;
  --duan-muted: #79736d;
  --duan-subtle: #9d958c;
  --duan-line: #e1dad2;
  --duan-accent: #c45235;
  --duan-accent-soft: rgba(196, 82, 53, .1);
  --duan-sidebar: #242321;
  --duan-sidebar-fg: #f8f4ef;
  --duan-reading: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --duan-sans: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--duan-bg);
  color: var(--duan-fg);
  font-family: var(--duan-sans);
}

html.duan-dark body.duan-experience {
  --duan-bg: #1d1c1a;
  --duan-bg-soft: #272421;
  --duan-paper: #22201e;
  --duan-fg: #e9e4dd;
  --duan-muted: #aaa39a;
  --duan-subtle: #857f78;
  --duan-line: #3c3834;
  --duan-accent: #e0785b;
  --duan-accent-soft: rgba(224, 120, 91, .13);
  --duan-sidebar: #151412;
  --duan-sidebar-fg: #f8f4ef;
}

body.duan-experience .headband,
body.duan-experience .main > .column,
body.duan-experience > .footer,
body.duan-experience .back-to-top,
body.duan-experience .sidebar-toggle,
body.duan-experience .reading-progress-bar {
  display: none !important;
}

body.duan-experience .main {
  display: block;
  min-height: 100vh;
  padding: 0;
}

body.duan-experience .main-inner {
  box-sizing: border-box;
  margin: 0 0 0 280px;
  max-width: none;
  min-height: 100vh;
  padding: 44px clamp(28px, 6vw, 88px) 80px;
  width: auto;
}

body.duan-experience .post-block {
  background: transparent;
  box-shadow: none;
  margin: 0 auto;
  max-width: 840px;
  padding: 0;
}

body.duan-experience .post-header {
  border-bottom: 1px solid var(--duan-line);
  margin: 0 0 32px;
  padding: 18px 0 28px;
  text-align: left;
}

body.duan-experience .post-title {
  color: var(--duan-fg);
  font-family: var(--duan-reading);
  font-size: clamp(34px, 4vw, 50px);
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.25;
  margin: 0;
}

body.duan-experience .post-description {
  color: var(--duan-muted);
  font-family: var(--duan-reading);
  font-size: 16px;
  line-height: 1.9;
  margin-top: 14px;
  text-align: left;
}

body.duan-experience .breadcrumb {
  color: var(--duan-subtle);
  justify-content: flex-start;
  margin: 14px 0 0;
  padding: 0;
}

body.duan-experience .breadcrumb a,
body.duan-experience .post-body a {
  border-bottom-color: color-mix(in srgb, var(--duan-accent) 45%, transparent);
  color: var(--duan-accent);
}

body.duan-experience .post-body {
  color: var(--duan-fg);
  font-family: var(--duan-reading);
  font-size: 17px;
  line-height: 2;
  text-align: left;
}

body.duan-experience .post-body p {
  margin: 1.05em 0;
}

body.duan-experience .post-body h2,
body.duan-experience .post-body h3,
body.duan-experience .post-body h4 {
  color: var(--duan-fg);
  font-family: var(--duan-sans);
  font-weight: 750;
  line-height: 1.45;
  scroll-margin-top: 78px;
}

body.duan-experience .post-body h2 {
  border-bottom: 1px solid var(--duan-line);
  font-size: 25px;
  margin: 2.7em 0 1em;
  padding-bottom: .45em;
}

body.duan-experience .post-body h3 {
  color: var(--duan-accent);
  font-size: 19px;
  margin: 2.1em 0 .7em;
}

body.duan-experience .post-body blockquote {
  background: linear-gradient(105deg, var(--duan-accent-soft), transparent 85%);
  border-left: 3px solid var(--duan-accent);
  color: var(--duan-muted);
  margin: 1.45em 0;
  padding: 12px 18px;
}

body.duan-experience .post-body blockquote:first-child {
  background: var(--duan-bg-soft);
  border-left-color: var(--duan-line);
  font-family: var(--duan-sans);
  font-size: 13px;
  line-height: 1.7;
  margin-top: 0;
}

body.duan-experience .post-body strong { color: color-mix(in srgb, var(--duan-fg) 82%, var(--duan-accent)); }
body.duan-experience .post-body hr { background: var(--duan-line); height: 1px; margin: 3em 0; }
body.duan-experience .post-body table { border-color: var(--duan-line); font-family: var(--duan-sans); font-size: 14px; }
body.duan-experience .post-body th { background: var(--duan-bg-soft); }
body.duan-experience .post-body td,
body.duan-experience .post-body th { border-color: var(--duan-line); padding: 10px 12px; }

.duan-article-nav { border-top: 1px solid var(--duan-line); display: grid; font-family: var(--duan-sans); gap: 10px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 50px; padding-top: 20px; }
.duan-article-nav a { background: var(--duan-paper); border: 1px solid var(--duan-line) !important; border-radius: 8px; color: var(--duan-fg) !important; min-width: 0; padding: 11px 12px; text-decoration: none; }
.duan-article-nav a:hover { border-color: var(--duan-accent) !important; }
.duan-article-nav small { color: var(--duan-subtle); display: block; font-size: 10px; margin-bottom: 4px; }
.duan-article-nav span { display: block; font-size: 11px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.duan-nav-home { text-align: center; }

.duan-reading-progress {
  background: transparent;
  height: 3px;
  left: 0;
  pointer-events: none;
  position: fixed;
  right: 0;
  top: 0;
  z-index: 1002;
}
.duan-reading-progress span { background: var(--duan-accent); display: block; height: 100%; transform-origin: left; width: 0; }

.duan-library-sidebar {
  background: var(--duan-sidebar);
  bottom: 0;
  color: var(--duan-sidebar-fg);
  display: flex;
  flex-direction: column;
  left: 0;
  position: fixed;
  top: 0;
  width: 280px;
  z-index: 1000;
}

.duan-sidebar-head { border-bottom: 1px solid color-mix(in srgb, var(--duan-sidebar-fg) 14%, transparent); padding: 22px 18px 18px; }
.duan-sidebar-brand { align-items: center; color: inherit !important; display: flex; font-size: 15px; font-weight: 700; gap: 10px; letter-spacing: .05em; text-decoration: none; }
.duan-seal { border: 1px solid var(--duan-accent); border-radius: 50%; color: var(--duan-accent); display: grid; font-family: var(--duan-reading); font-size: 16px; height: 31px; place-items: center; width: 31px; }
.duan-sidebar-close { display: none; }

.duan-search-box { align-items: center; border: 1px solid color-mix(in srgb, var(--duan-sidebar-fg) 18%, transparent); border-radius: 7px; display: grid; gap: 6px; grid-template-columns: 16px 1fr 24px; margin: 12px 12px 7px; padding: 0 8px; }
.duan-search-box input { background: transparent; border: 0; color: inherit; font: inherit; font-size: 13px; height: 38px; min-width: 0; outline: 0; padding: 0; }
.duan-search-box input::placeholder { color: color-mix(in srgb, var(--duan-sidebar-fg) 55%, transparent); }
.duan-search-box button { background: none; border: 0; color: inherit; cursor: pointer; font-size: 18px; opacity: 0; }
.duan-search-box:focus-within { border-color: var(--duan-accent); }
.duan-search-box:focus-within button { opacity: .6; }
.duan-search-status { color: color-mix(in srgb, var(--duan-sidebar-fg) 58%, transparent); font-size: 11px; min-height: 16px; padding: 0 17px 5px; }

.duan-catalog { flex: 1; overflow-y: auto; padding: 2px 9px 18px; scrollbar-color: color-mix(in srgb, var(--duan-sidebar-fg) 22%, transparent) transparent; scrollbar-width: thin; }
.duan-catalog details { margin: 1px 0; }
.duan-catalog summary { align-items: center; border-radius: 6px; color: color-mix(in srgb, var(--duan-sidebar-fg) 78%, transparent); cursor: pointer; display: flex; font-size: 13px; font-weight: 650; gap: 7px; list-style: none; padding: 8px 9px; }
.duan-catalog summary::-webkit-details-marker { display: none; }
.duan-catalog summary:hover { background: color-mix(in srgb, var(--duan-sidebar-fg) 7%, transparent); color: var(--duan-sidebar-fg); }
.duan-catalog summary::before { content: "›"; transition: transform .2s; }
.duan-catalog details[open] summary::before { transform: rotate(90deg); }
.duan-category-count { font-size: 10px; margin-left: auto; opacity: .55; }
.duan-catalog-list { border-left: 1px solid color-mix(in srgb, var(--duan-sidebar-fg) 18%, transparent); margin: 0 0 6px 13px; padding-left: 9px; }
.duan-catalog-list a { border-left: 2px solid transparent; border-radius: 0 5px 5px 0; color: color-mix(in srgb, var(--duan-sidebar-fg) 62%, transparent) !important; display: block; font-size: 12px; line-height: 1.45; margin: 1px 0; overflow: hidden; padding: 5px 7px; text-decoration: none; text-overflow: ellipsis; white-space: nowrap; }
.duan-catalog-list a:hover { background: color-mix(in srgb, var(--duan-sidebar-fg) 7%, transparent); color: var(--duan-sidebar-fg) !important; }
.duan-catalog-list a.is-active { background: var(--duan-accent-soft); border-left-color: var(--duan-accent); color: var(--duan-accent) !important; font-weight: 650; }
.duan-loading { font-size: 12px; opacity: .6; padding: 12px; }

.duan-current-toc { border-bottom: 1px solid color-mix(in srgb, var(--duan-sidebar-fg) 12%, transparent); display: none; margin: 0 12px 5px; max-height: 190px; overflow: auto; padding: 4px 3px 10px; }
.duan-current-toc.has-items { display: block; }
.duan-current-toc strong { color: var(--duan-accent); display: block; font-size: 10px; letter-spacing: .12em; padding: 4px 3px 6px; }
.duan-current-toc a { color: color-mix(in srgb, var(--duan-sidebar-fg) 64%, transparent) !important; display: block; font-size: 11px; line-height: 1.4; overflow: hidden; padding: 3px; text-decoration: none; text-overflow: ellipsis; white-space: nowrap; }
.duan-current-toc a:hover { color: var(--duan-sidebar-fg) !important; }

.duan-search-result { border-bottom: 1px solid color-mix(in srgb, var(--duan-sidebar-fg) 10%, transparent); color: inherit !important; display: block; padding: 9px 8px; text-decoration: none; }
.duan-search-result b { color: var(--duan-sidebar-fg); display: block; font-size: 12px; }
.duan-search-result small { color: var(--duan-accent); font-size: 10px; }
.duan-search-result p { color: color-mix(in srgb, var(--duan-sidebar-fg) 58%, transparent); font-size: 10px; line-height: 1.45; margin: 4px 0 0; }

.duan-sidebar-foot { align-items: center; border-top: 1px solid color-mix(in srgb, var(--duan-sidebar-fg) 14%, transparent); display: flex; font-size: 11px; justify-content: space-between; padding: 13px 18px; }
.duan-sidebar-foot a { color: color-mix(in srgb, var(--duan-sidebar-fg) 65%, transparent) !important; text-decoration: none; }
.duan-sidebar-foot button { background: none; border: 1px solid color-mix(in srgb, var(--duan-sidebar-fg) 22%, transparent); border-radius: 5px; color: inherit; cursor: pointer; font-size: 10px; padding: 4px 7px; }

.duan-mobile-bar,
.duan-drawer-overlay { display: none; }

/* Knowledge-base landing page. */
body.duan-home-page .post-header { display: none; }
.duan-home-hero { padding: 34px 0 42px; text-align: center; }
.duan-home-kicker { color: var(--duan-accent); font-size: 11px; font-weight: 700; letter-spacing: .28em; }
.duan-home-title { color: var(--duan-fg); font-family: var(--duan-reading); font-size: clamp(40px, 7vw, 68px); font-weight: 700; letter-spacing: .22em; line-height: 1.25; margin: 15px 0 20px; }
.duan-home-quote { color: var(--duan-muted); font-family: var(--duan-reading); font-size: 17px; line-height: 2; margin: 0 auto; max-width: 710px; }
.duan-home-meta { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 24px; }
.duan-home-meta a,
.duan-home-meta span { background: var(--duan-paper); border: 1px solid var(--duan-line); border-radius: 8px; color: var(--duan-muted) !important; font-family: var(--duan-sans); font-size: 12px; padding: 8px 13px; text-decoration: none; }

.duan-category-grid { display: grid; gap: 12px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 8px 0 48px; }
.duan-category-card { align-items: center; background: var(--duan-paper); border: 1px solid var(--duan-line); border-radius: 10px; color: inherit !important; display: grid; gap: 14px; grid-template-columns: 48px 1fr; min-height: 100px; padding: 16px; text-decoration: none; transition: border-color .2s, transform .2s, box-shadow .2s; }
.duan-category-card:hover { border-color: var(--duan-accent); box-shadow: 0 10px 28px rgba(60, 46, 35, .08); transform: translateY(-2px); }
.duan-card-glyph { background: var(--duan-accent-soft); border-radius: 10px; color: var(--duan-accent); display: grid; font-family: var(--duan-reading); font-size: 22px; height: 48px; place-items: center; width: 48px; }
.duan-card-title { align-items: center; display: flex; font-family: var(--duan-sans); font-size: 17px; font-weight: 750; justify-content: space-between; }
.duan-card-count { color: var(--duan-accent); font-size: 11px; }
.duan-card-description { color: var(--duan-muted); font-family: var(--duan-sans); font-size: 12px; line-height: 1.6; margin-top: 5px; }

.duan-home-section { border-top: 1px solid var(--duan-line); padding: 30px 0 10px; scroll-margin-top: 70px; }
.duan-home-section h2 { align-items: baseline; border: 0 !important; display: flex; font-size: 24px !important; justify-content: space-between; margin: 0 0 16px !important; padding: 0 !important; }
.duan-home-section h2 span { color: var(--duan-subtle); font-size: 11px; font-weight: 500; }
.duan-home-list { display: grid; gap: 8px 22px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0 0 24px; padding: 0; }
.duan-home-list li { border-bottom: 1px dashed var(--duan-line); list-style: none; min-width: 0; }
.duan-home-list a { color: var(--duan-fg) !important; display: block; font-family: var(--duan-sans); font-size: 13px; overflow: hidden; padding: 8px 2px; text-decoration: none; text-overflow: ellipsis; white-space: nowrap; }
.duan-home-list a:hover { color: var(--duan-accent) !important; }

.duan-book-grid { display: grid; gap: 18px; grid-template-columns: repeat(6, minmax(0, 1fr)); margin: 12px 0 36px; }
.duan-book { color: var(--duan-muted) !important; font-family: var(--duan-sans); font-size: 10px; line-height: 1.35; text-align: center; text-decoration: none; }
.duan-book img { aspect-ratio: 3/4; border-radius: 5px; box-shadow: 0 8px 22px rgba(49, 37, 27, .13); display: block; margin-bottom: 8px; object-fit: cover; transition: transform .2s; width: 100%; }
.duan-book:hover img { transform: translateY(-3px); }
.duan-home-source { color: var(--duan-subtle); font-family: var(--duan-sans); font-size: 11px; text-align: center; }

@media (max-width: 1024px) {
  body.duan-experience .main-inner { margin-left: 0; padding: 78px clamp(20px, 6vw, 56px) 70px; }
  .duan-mobile-bar { align-items: center; backdrop-filter: blur(12px); background: color-mix(in srgb, var(--duan-bg) 90%, transparent); border-bottom: 1px solid var(--duan-line); display: flex; height: 58px; justify-content: space-between; left: 0; padding: 0 14px; position: fixed; right: 0; top: 0; z-index: 998; }
  .duan-mobile-brand { color: var(--duan-fg) !important; font-size: 13px; font-weight: 700; letter-spacing: .04em; text-decoration: none; }
  .duan-icon-button { background: var(--duan-paper); border: 1px solid var(--duan-line); border-radius: 8px; color: var(--duan-muted); cursor: pointer; font-size: 18px; height: 38px; width: 38px; }
  .duan-library-sidebar { box-shadow: 12px 0 40px rgba(0, 0, 0, .2); transform: translateX(-105%); transition: transform .28s ease; width: min(330px, 90vw); z-index: 1001; }
  .duan-nav-open .duan-library-sidebar { transform: translateX(0); }
  .duan-drawer-overlay { background: rgba(0, 0, 0, .42); bottom: 0; display: block; left: 0; opacity: 0; pointer-events: none; position: fixed; right: 0; top: 0; transition: opacity .25s; z-index: 1000; }
  .duan-nav-open .duan-drawer-overlay { opacity: 1; pointer-events: auto; }
  .duan-sidebar-head { align-items: center; display: flex; justify-content: space-between; }
  .duan-sidebar-close { background: none; border: 0; color: inherit; cursor: pointer; display: block; font-size: 26px; }
  body.duan-experience .post-header { padding-top: 4px; }
}

@media (max-width: 700px) {
  body.duan-experience .main-inner { padding-left: 18px; padding-right: 18px; }
  body.duan-experience .post-title { font-size: 34px; }
  body.duan-experience .post-description { font-size: 14px; }
  body.duan-experience .post-body { font-size: 16px; line-height: 1.9; }
  body.duan-experience .post-body h2 { font-size: 22px; }
  .duan-home-hero { padding-top: 12px; }
  .duan-home-title { font-size: 43px; letter-spacing: .12em; }
  .duan-home-quote { font-size: 15px; }
  .duan-category-grid,
  .duan-home-list { grid-template-columns: 1fr; }
  .duan-book-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .duan-article-nav { grid-template-columns: 1fr; }
  .duan-nav-home { text-align: left; }
}