/* B7 reading integration: keep H01 intact while adding a catalog return and nav avoidance. */
.b0-reading-note {
  margin: 26px 0 0;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.72rem;
  line-height: 1.7;
}

.doc-body .source-note {
  margin-bottom: 28px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
}

.doc-body .numbered-block {
  margin-top: 30px;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 16px;
}

.doc-body .numbered-block > span {
  font-family: var(--reading);
  color: var(--faint);
}

.doc-body .numbered-block p {
  margin: 0;
}

.doc-body .numbered-block strong {
  color: var(--ink-strong);
}

.article-media {
  margin: 64px 0;
}

.article-media img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  filter: saturate(0.8);
}

.article-media figcaption {
  margin-top: 12px;
  color: var(--faint);
  font: 500 0.64rem/1.6 var(--mono);
}

.article-end {
  margin-top: 50px !important;
  color: var(--muted) !important;
  font-family: var(--mono) !important;
  font-size: 0.72rem !important;
}

.b0-material-gap {
  margin-top: 72px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.76rem;
  line-height: 1.8;
}

.reading-return {
  min-height: 44px;
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  text-decoration: none;
}

.reading-return:hover,
.reading-return:focus-visible {
  color: var(--ink-strong);
}

.reading-return-short {
  display: none;
}

.b0-desktop-nav,
.b0-mobile-nav {
  transition:
    opacity 180ms ease,
    transform 220ms ease;
}

body.is-global-nav-hidden .b0-desktop-nav {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -96px) !important;
}

body.is-global-nav-hidden .b0-mobile-nav {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-100%);
}

@media (min-width: 821px) {
  html {
    scroll-padding-top: 96px;
  }

  .doc-head {
    padding-top: 118px;
  }

  .rail {
    padding-top: 82px;
  }
}

@media (min-width: 821px) and (max-width: 1000px) {
  body {
    padding-top: 0;
  }

  .rail {
    position: fixed;
    z-index: 90;
    inset: 0 auto 0 0;
    width: 220px;
    height: auto;
    padding: 82px 22px 22px 26px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border: 0;
    background: transparent;
    backdrop-filter: none;
  }

  .rail-brand {
    display: flex;
  }

  .rail-toc {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
    margin: 0;
  }

  .rail-toc-label,
  .rail-readpct {
    display: block;
  }

  .rail-toc ol {
    display: grid;
    grid-auto-flow: row;
    justify-content: stretch;
    gap: 2px;
    overflow: visible;
  }

  .rail-toc a {
    min-height: 44px;
    padding: 9px 0;
    display: grid;
    gap: 9px;
    white-space: normal;
  }

  .rail-toc .toc-row {
    grid-template-columns: 18px 1fr;
  }

  .rail-toc .toc-num,
  .rail-toc .toc-track {
    display: block;
  }

  .rail-controls {
    margin: 0;
    padding-top: 24px;
  }

  .reading {
    padding: 0 30px 132px 238px;
  }
}

@media (max-width: 820px) {
  html {
    scroll-padding-top: 130px;
  }

  body {
    padding-top: 60px;
  }

  .rail {
    top: 60px;
    padding: 8px 14px;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 10px;
    transition:
      top 220ms ease,
      opacity 180ms ease,
      transform 220ms ease;
  }

  body.is-global-nav-hidden .rail {
    top: 0;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-100%);
  }

  .rail-brand {
    display: none;
  }

  .reading-return {
    margin: 0;
    padding: 0 8px;
    white-space: nowrap;
  }

  .reading-return-long {
    display: none;
  }

  .reading-return-short {
    display: inline;
  }

  .rail-toc {
    grid-column: 2;
  }

  .rail-controls {
    grid-column: 3;
  }

  .doc-head {
    padding-top: 52px;
  }
}

@media (max-width: 620px) {
  .doc-body .numbered-block {
    grid-template-columns: 26px 1fr;
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .b0-desktop-nav,
  .b0-mobile-nav,
  .rail {
    transition: none;
  }
}

/* F107: the author selected PingFang for prose after the F106 controlled
   comparison. F105 geometry and H01 navigation remain unchanged. */
body[data-reading-page="article"] {
  --reading: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --measure: 45rem;
  --body-size: 19px;
  --body-leading: 1.88;
}

body[data-reading-page="article"] .doc-title {
  font-size: clamp(30px, 2.8vw, 40px);
  line-height: 1.35;
  letter-spacing: -0.015em;
  text-wrap: balance;
  overflow-wrap: break-word;
}

body[data-reading-page="article"] .doc-kicker {
  margin-bottom: 18px;
  font-size: 11px;
  line-height: 1.5;
}

body[data-reading-page="article"] .doc-lead {
  margin-top: 20px;
  font-size: 17px;
  line-height: 1.8;
}

body[data-reading-page="article"] .doc-meta {
  margin-top: 26px;
  line-height: 1.6;
}

body[data-reading-page="article"] .doc-meta dl {
  gap: 10px 24px;
}

body[data-reading-page="article"] .doc-meta dt {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

body[data-reading-page="article"] .doc-meta dd {
  font-size: 13px;
}

body[data-reading-page="article"] .doc-head {
  padding-bottom: 34px;
}

body[data-reading-page="article"] .doc-body {
  font-family: var(--reading);
  font-size: var(--body-size);
  line-height: var(--body-leading);
  overflow-wrap: break-word;
}

body[data-reading-page="article"] .doc-body section {
  padding-top: 64px;
}

body[data-reading-page="article"] .doc-body > section:first-child {
  padding-top: 46px;
}

body[data-reading-page="article"] .doc-body p {
  letter-spacing: 0;
  text-align: left;
}

body[data-reading-page="article"] .doc-body p + p {
  margin-top: 1.2em;
}

body[data-reading-page="article"] .doc-body :is(h2, h3, h4) {
  margin: 2.1em 0 0.85em;
  font-family: var(--reading);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0;
  color: var(--ink-strong);
  text-wrap: pretty;
}

body[data-reading-page="article"] .doc-body h2 {
  font-size: 26px;
}

body[data-reading-page="article"] .doc-body h3 {
  font-size: 21px;
}

body[data-reading-page="article"] .doc-body h4 {
  font-size: 18.5px;
}

body[data-reading-page="article"] .doc-body .sec-head {
  margin-top: 0;
}

body[data-reading-page="article"] .doc-body strong {
  font-weight: 700;
  color: var(--ink-strong);
}

/* Lists and the original numbered paragraphs share the prose rhythm. */
body[data-reading-page="article"] .doc-body :is(ul, ol) {
  margin: 1.2em 0;
  padding-left: 1.45em;
}

body[data-reading-page="article"] .doc-body li {
  padding-left: 0.2em;
  font-size: inherit;
  line-height: inherit;
}

body[data-reading-page="article"] .doc-body li + li {
  margin-top: 0.45em;
}

body[data-reading-page="article"] .doc-body .numbered-block {
  margin-top: 1.2em;
  grid-template-columns: 1.4em minmax(0, 1fr);
  gap: 14px;
}

body[data-reading-page="article"] .doc-body .numbered-block + p {
  margin-top: 1.2em;
}

body[data-reading-page="article"] .doc-body blockquote:not(.pull) {
  margin: 1.35em 0;
  padding-left: 1em;
  border-left: 1px solid var(--line);
}

/* The source date precedes a hidden duplicate title in imported articles.
   Keep it visible and readable as metadata, without treating it as a pull quote. */
body[data-reading-page="article"] .doc-body > section > blockquote:first-child:has(+ .repeated-title) {
  margin: 0 0 24px;
  padding: 0;
  border: 0;
}

body[data-reading-page="article"] .doc-body > section > blockquote:first-child:has(+ .repeated-title) p,
body[data-reading-page="article"] .doc-body .source-note {
  font-family: var(--reading);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0;
  color: var(--muted);
}

@media (min-width: 1001px) {
  body[data-reading-page="article"] .rail-toc .toc-row {
    min-width: 0;
  }

  body[data-reading-page="article"] .rail-toc .toc-text {
    white-space: normal;
    overflow-wrap: break-word;
  }
}

@media (max-width: 820px) {
  body[data-reading-page="article"] {
    --body-size: 18px;
    --body-leading: 1.85;
  }

  body[data-reading-page="article"] .doc-head {
    padding-top: 36px;
    padding-bottom: 28px;
  }

  body[data-reading-page="article"] .doc-title {
    font-size: 30px;
  }

  body[data-reading-page="article"] .doc-lead {
    margin-top: 16px;
    font-size: 16px;
  }

  body[data-reading-page="article"] .doc-meta {
    margin-top: 22px;
  }

  body[data-reading-page="article"] .doc-meta dl {
    gap: 8px 20px;
  }

  body[data-reading-page="article"] .doc-body section {
    padding-top: 48px;
  }

  body[data-reading-page="article"] .doc-body > section:first-child {
    padding-top: 34px;
  }

  body[data-reading-page="article"] .doc-body h2 {
    font-size: 23px;
  }

  body[data-reading-page="article"] .doc-body h3 {
    font-size: 20px;
  }
}

@media (max-width: 620px) {
  body[data-reading-page="article"] .reading {
    padding-inline: 22px;
  }
}

@media (max-width: 359px) {
  body[data-reading-page="article"] .reading {
    padding-inline: 18px;
  }

  body[data-reading-page="article"] .doc-title {
    font-size: 28px;
  }
}