/* Only the dedicated article template uses this namespace. */
.ai-feed-page {
  --ai-brand: var(--primary-color, #1E40AF); --ai-soft: #F8F9FA;
  --ai-text: #2D3748; --ai-muted: #718096; --ai-line: #E6E8EE;
  --ai-nav-height: 75px; --ai-gap: 56px; --ai-section-gap: 64px;
  --ai-radius: 12px; --ai-shadow: 0 4px 20px rgb(0 0 0 / 6%);
  max-width: 1216px; margin: 0 auto; padding: 24px 24px 64px;
  color: var(--ai-text); font-size: 16px; line-height: 1.8;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}
.ai-feed-page *, .ai-feed-page *::before, .ai-feed-page *::after { box-sizing: border-box; }
.ai-feed-page a { color: inherit; text-decoration: none; }
.ai-feed-page a:focus-visible, .ai-feed-page summary:focus-visible { outline: 2px solid var(--ai-brand); outline-offset: 4px; }
.ai-feed-page p { margin: 0 0 20px; font-size: inherit; line-height: inherit; }
.ai-feed-page h1, .ai-feed-page h2, .ai-feed-page h3 { color: var(--ai-text); font-weight: 700; line-height: 1.45; }
/* The shared site stylesheet sets a fixed height on every header element. */
.ai-feed-page header { position: static; height: auto; min-height: 0; width: auto; background: none; box-shadow: none; z-index: auto; }
.ai-feed-breadcrumb { display: flex; flex-wrap: wrap; gap: 10px; color: var(--ai-muted); font-size: 13px; margin-bottom: 34px; }
.ai-feed-layout { display: grid; grid-template-columns: minmax(0, 800px) minmax(260px, 312px); gap: var(--ai-gap); align-items: start; }
.ai-feed-main, .ai-feed-sidebar { min-width: 0; }
.ai-feed-main h1 { font-size: clamp(28px, 2.7vw, 38px); margin: 10px 0 20px; letter-spacing: -.6px; text-wrap: balance; }
.ai-feed-kicker { font-size: 12px !important; letter-spacing: 1px; color: var(--ai-brand); }
.ai-feed-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13px !important; color: var(--ai-muted); }
.ai-feed-cover { margin: 28px 0 36px; }
.ai-feed-cover img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 14px; }
.ai-feed-intro { font-size: 18px; margin-bottom: var(--ai-section-gap); }
.ai-feed-metrics { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); margin: 30px 0; }
.ai-feed-metrics > div { padding: 0 22px; border-left: 1px solid var(--ai-line); }
.ai-feed-metrics > div:first-child { padding-left: 0; border: 0; }
.ai-feed-metrics strong { display: block; color: var(--ai-brand); font-size: 32px; line-height: 1.3; font-variant-numeric: tabular-nums; }
.ai-feed-metrics strong span { font-size: 16px; margin-left: 3px; }
.ai-feed-metrics small { font-size: 13px; color: var(--ai-muted); }
.ai-feed-section { border-top: 1px solid var(--ai-line); padding-top: 32px; margin: var(--ai-section-gap) 0; scroll-margin-top: calc(var(--ai-nav-height) + 28px); }
.ai-feed-section-heading { display: flex; align-items: flex-start; gap: 20px; margin-bottom: 28px; }
.ai-feed-section-heading > span { flex: 0 0 auto; color: var(--ai-brand); font: 44px/1.25 Georgia, serif; }
.ai-feed-section-heading h2 { min-width: 0; flex: 1; font-size: 24px; margin: 0; white-space: normal; overflow-wrap: anywhere; }
.ai-feed-page h3 { font-size: 19px; margin: 32px 0 18px; }
.ai-feed-page blockquote { margin: 28px 0; padding: 18px 22px; border: 0; border-left: 3px solid var(--ai-brand); background: linear-gradient(90deg, rgb(30 64 175 / 5%), transparent); font-size: 17px; }
.ai-feed-page blockquote p:last-child { margin-bottom: 0; }
.ai-feed-preview { display: flex; flex-wrap: wrap; gap: 12px; margin: 26px 0; }
.ai-feed-preview a { flex: 1 1 200px; background: var(--ai-soft); padding: 12px 16px; color: var(--ai-brand); border-radius: 6px; font-size: 14px; }
.ai-feed-preview span { float: right; }
.ai-feed-steps { list-style: none; padding: 0; margin: 24px 0; counter-reset: reasoning; }
.ai-feed-steps li { position: relative; padding: 0 0 22px 42px; counter-increment: reasoning; }
.ai-feed-steps li::before { content: counter(reasoning); position: absolute; left: 0; top: 3px; width: 24px; height: 24px; background: var(--ai-brand); color: #fff; border-radius: 50%; text-align: center; font-size: 12px; line-height: 24px; z-index: 1; }
.ai-feed-steps li:not(:last-child)::after { content: ""; position: absolute; left: 11px; top: 30px; bottom: 2px; width: 1px; background: var(--ai-line); }
.ai-feed-steps p { margin: 0; }
.ai-feed-comparison { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; margin: 28px 0; }
.ai-feed-option { padding: 26px; border-radius: var(--ai-radius); background: var(--ai-soft); }
.ai-feed-option-strong { background: #fff; box-shadow: var(--ai-shadow); border-top: 3px solid var(--ai-brand); }
.ai-feed-option p { font-size: 15px; margin: 18px 0 0; }
.ai-feed-option:not(.ai-feed-option-strong) .ai-feed-kicker { color: var(--ai-muted); }
.ai-feed-highlight { font-size: 32px; line-height: 1.5; font-weight: 700; margin: 10px 0; font-variant-numeric: tabular-nums; }
.ai-feed-option-strong .ai-feed-highlight { color: var(--ai-brand); }
.ai-feed-highlight small { display: block; font-size: 13px; font-weight: 400; color: var(--ai-muted); }
.ai-feed-workflow { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 24px; list-style: none; padding: 0; margin: 30px 0; }
.ai-feed-workflow li { position: relative; padding: 18px 12px; background: var(--ai-soft); border-radius: 8px; }
.ai-feed-workflow p { margin: 0; font-size: 14px; }
.ai-feed-workflow li:not(:last-child)::after { content: "→"; position: absolute; right: -20px; top: 40%; color: var(--ai-brand); }
.ai-feed-zones { display: grid; gap: 14px; }
.ai-feed-zone { border-left: 3px solid; padding: 18px 20px; border-radius: 0 8px 8px 0; }
.ai-feed-zone p { margin: 0; }
.ai-feed-zone-green { border-color: #388568; background: #F0F8F4; }
.ai-feed-zone-yellow { border-color: #B58A2C; background: #FCF8EC; }
.ai-feed-zone-red { border-color: #B86666; background: #FCF3F3; }
.ai-feed-case { padding: 28px; background: #fff; border-radius: var(--ai-radius); box-shadow: var(--ai-shadow); }
.ai-feed-badge { display: inline-block; margin-bottom: 24px; border-radius: 30px; padding: 5px 12px; color: var(--ai-brand); background: rgb(30 64 175 / 6%); font-size: 13px; }
.ai-feed-case strong { color: var(--ai-brand); font-size: 18px; }
.ai-feed-case p:last-child { margin: 0; }
.ai-feed-signature { padding: 24px 0; border-top: 1px solid var(--ai-line); }
.ai-feed-copyright { color: var(--ai-muted); font-size: 13px !important; }
.ai-feed-related h2 { font-size: 22px; }
.ai-feed-related a { display: flex; justify-content: space-between; align-items: start; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--ai-line); }
.ai-feed-related time { flex: 0 0 auto; font-size: 12px; color: var(--ai-muted); }
.ai-feed-sticky { position: sticky; top: calc(var(--ai-nav-height) + 24px); max-height: calc(100dvh - var(--ai-nav-height) - 48px); overflow-y: auto; padding: 0 4px 8px; scrollbar-width: thin; }
.ai-feed-sidebar { align-self: stretch; }
.ai-feed-outline { margin-bottom: 28px; }
.ai-feed-outline summary { display: flex; justify-content: space-between; padding: 12px 0; font-size: 15px; font-weight: 600; list-style: none; cursor: pointer; }
.ai-feed-outline summary::-webkit-details-marker { display: none; }
.ai-feed-outline summary span { color: var(--ai-muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.ai-feed-outline progress { display: block; width: 100%; height: 3px; border: 0; appearance: none; background: var(--ai-line); }
.ai-feed-outline progress::-webkit-progress-bar { background: var(--ai-line); }
.ai-feed-outline progress::-webkit-progress-value { background: var(--ai-brand); }
.ai-feed-outline progress::-moz-progress-bar { background: var(--ai-brand); }
.ai-feed-outline nav { padding-top: 14px; }
.ai-feed-outline nav a { display: flex; gap: 12px; padding: 11px 12px; border-left: 2px solid transparent; font-size: 14px; color: var(--ai-muted); }
.ai-feed-outline nav a span { font-variant-numeric: tabular-nums; font-size: 12px; }
.ai-feed-outline nav a[aria-current] { color: var(--ai-brand); border-color: var(--ai-brand); background: var(--ai-soft); font-weight: 600; }
.ai-feed-contact { padding: 24px; background: var(--ai-soft); border-radius: var(--ai-radius); }
.ai-feed-contact h2 { font-size: 21px; margin: 14px 0; }
.ai-feed-contact p { font-size: 14px; color: var(--ai-muted); }
.ai-feed-contact a { display: flex; justify-content: space-between; color: white; background: var(--ai-brand); border-radius: 6px; padding: 12px; font-size: 14px; }
.ai-feed-contact small { display: block; font-size: 12px; color: var(--ai-muted); margin-top: 14px; }
.ai-feed-mobile-toc { display: none; }
/* Retain the site's phone/WeChat/back-to-top controls; reserve a right-hand gutter. */
html.has-ai-feed-reader #backTop { right: 8px; top: auto; bottom: 20px; transform: none; }
@media (min-width: 1024px) and (max-width: 1343px) {
  .ai-feed-page { margin-left: 24px; margin-right: 72px; padding-left: 0; padding-right: 0; --ai-gap: 32px; }
  .ai-feed-layout { grid-template-columns: minmax(0,1fr) 280px; }
}
@media (max-width: 1023px) {
  .ai-feed-page { padding: 18px 24px 48px; --ai-section-gap: 52px; }
  .ai-feed-layout { display: block; }
  .ai-feed-sidebar { display: none; }
  .ai-feed-mobile-toc:not(:empty) { display: block; position: sticky; top: var(--ai-nav-height); z-index: 90; background: #fff; box-shadow: 0 4px 12px rgb(0 0 0 / 4%); margin-bottom: 24px; }
  .ai-feed-mobile-toc .ai-feed-outline { margin: 0; padding: 0 12px; }
  .ai-feed-outline summary::after { content: "⌄"; color: var(--ai-muted); }
  .ai-feed-outline[open] summary::after { content: "⌃"; }
  .ai-feed-outline nav { max-height: 45vh; overflow-y: auto; }
  .ai-feed-section { scroll-margin-top: calc(var(--ai-nav-height) + 80px); }
  .ai-feed-contact { margin: 24px 0; }
  .ai-feed-workflow { grid-template-columns: 1fr; gap: 24px; }
  .ai-feed-workflow li:not(:last-child)::after { content: "↓"; right: auto; left: 50%; top: auto; bottom: -24px; }
  html.has-ai-feed-reader #backTop { right: 4px; bottom: 12px; }
  html.has-ai-feed-reader #backTop .ft-tel, html.has-ai-feed-reader #backTop .ft-qq { display: block; }
}
@media (max-width: 599px) {
  .ai-feed-page { padding-left: 18px; padding-right: 48px; }
  .ai-feed-section-heading { gap: 12px; }
  .ai-feed-section-heading > span { font-size: 36px; }
  .ai-feed-section-heading h2 { font-size: 22px; }
  .ai-feed-intro { font-size: 17px; }
  .ai-feed-comparison { grid-template-columns: 1fr; }
  .ai-feed-metrics > div { padding: 0 10px; }
  .ai-feed-metrics strong { font-size: 32px; }
  .ai-feed-metrics small { font-size: 12px; }
  .ai-feed-case { padding: 20px; }
  .ai-feed-related a { display: block; }
  .ai-feed-related time { display: block; margin-top: 6px; }
}
@media (prefers-reduced-motion: reduce) { .ai-feed-page { scroll-behavior: auto; } }
@media print { .ai-feed-sidebar,.ai-feed-mobile-toc { display:none!important; } .ai-feed-layout{display:block;} .ai-feed-page{max-width:none;padding:0;} }