/* Article-only owner. These four pages replace guides.css/article-content.css with this file.
   Shared desktop-shell and mobile-topbar remain the existing site's components. */
:root {
  color-scheme: light;
  --guide-white: #fff;
  --guide-ink: #17354e;
  --guide-muted: #53697b;
  --guide-blue: #329bfa;
  --guide-link: #166db8;
  --guide-pale: #f6f8fa;
  --guide-line: #e1e6ee;
  --guide-surface: var(--guide-white);
  --guide-surface-subtle: var(--guide-pale);
  --guide-text: var(--guide-ink);
  --guide-border: var(--guide-line);
  --guide-space-0: 0px;
  --guide-space-4: 4px;
  --guide-space-8: 8px;
  --guide-space-12: 12px;
  --guide-space-16: 16px;
  --guide-space-20: 20px;
  --guide-space-24: 24px;
  --guide-space-32: 32px;
  --guide-space-40: 40px;
  --guide-space-48: 48px;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--guide-surface); color: var(--guide-text); font: 400 16px/1.75 "Site Noto", "Microsoft YaHei", sans-serif; font-synthesis: none; }
a { color: inherit; text-decoration: none; touch-action: manipulation; }
button, input { font: inherit; }
button { cursor: pointer; }
[hidden] { display: none; }
img { display: block; max-width: 100%; }
h1, h2, p { margin: 0; }
.ui-icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.ui-icon { width: 20px; height: 20px; }
.sr-only, .skip-link { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.skip-link:focus { width: auto; height: auto; clip-path: none; z-index: 100; background: var(--guide-surface); padding: var(--guide-space-12); }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible { outline: 2px solid var(--guide-link); outline-offset: 4px; }
.guide-main { width: min(1240px, calc(100% - 96px)); padding-right: calc(var(--guide-space-40) * 2); margin: var(--guide-space-24) auto var(--guide-space-48); }
.reading { display: grid; grid-template-columns: 224px minmax(0, 760px); column-gap: var(--guide-space-40); max-width: 1024px; margin: var(--guide-space-32) auto var(--guide-space-48); align-items: start; }
.reading-heading { grid-column: 2; min-width: 0; padding-bottom: var(--guide-space-24); margin-bottom: var(--guide-space-24); border-bottom: 1px solid var(--guide-border); }
.reading-heading .category { display: block; color: var(--guide-muted); font-size: 14px; line-height: 24px; margin-bottom: var(--guide-space-16); }
.reading h1 { color: var(--guide-text); font-size: 32px; font-weight: 500; line-height: 1.5; text-wrap: balance; }
.reading-title-term { white-space: nowrap; }
.intro { margin-top: var(--guide-space-20); color: var(--guide-muted); font-size: 16px; line-height: 28px; }
.reading-actions { display: flex; flex-wrap: wrap; gap: var(--guide-space-8) var(--guide-space-32); margin-top: var(--guide-space-16); }
.reading-actions a { display: inline-flex; align-items: center; min-height: 44px; color: var(--guide-link); text-decoration: underline; text-underline-offset: 4px; font-size: 15px; }
.reading-toc { grid-column: 1; grid-row: 1 / 3; position: sticky; top: var(--guide-space-24); align-self: start; padding: var(--guide-space-24) var(--guide-space-16); background: var(--guide-surface-subtle); border-radius: 6px; }
.reading-toc-title { font-size: 15px; font-weight: 500; margin: 0 var(--guide-space-8) var(--guide-space-12); }
.reading-toc ol { list-style: none; padding: 0; margin: 0; }
.reading-toc a { position: relative; display: flex; align-items: baseline; gap: var(--guide-space-8); min-height: 44px; padding: var(--guide-space-8); color: var(--guide-muted); font-size: 14px; line-height: 24px; }
.reading-toc-number { flex: none; font-variant-numeric: tabular-nums; }
.reading-toc a[aria-current="location"] { color: var(--guide-link); font-weight: 500; }
.reading-toc a[aria-current="location"]::before { content: ""; position: absolute; left: -16px; top: 12px; bottom: 12px; width: 3px; background: var(--guide-blue); border-radius: 2px; }
.reading-body { grid-column: 2; min-width: 0; overflow-wrap: break-word; }
.reading-body section { margin: 0 0 var(--guide-space-40); scroll-margin-top: var(--guide-space-24); }
.reading-body h2 { position: relative; padding-left: var(--guide-space-16); margin-bottom: var(--guide-space-16); color: var(--guide-text); font-size: 22px; font-weight: 500; line-height: 34px; text-wrap: pretty; }
.reading-body h2::before { content: ""; position: absolute; width: 4px; height: 22px; top: 6px; left: 0; background: var(--guide-blue); border-radius: 2px; }
.reading-body h2:focus-visible { outline: 2px solid var(--guide-link); outline-offset: 4px; }
.reading-body p { margin: 0 0 var(--guide-space-16); font-size: 16px; line-height: 28px; }
.reading-body p:last-child { margin-bottom: 0; }
.reading-body strong { font-weight: 500; }
.reading-body a, .read-link { color: var(--guide-link); text-decoration: underline; text-underline-offset: 4px; }
.reading-body ul, .reading-body ol { padding-left: var(--guide-space-24); margin: 0; }
.reading-body li { padding-left: var(--guide-space-4); margin: 0 0 var(--guide-space-12); }
.guide-comparison { margin: var(--guide-space-20) 0; }
.reading-comparison { width: 100%; border-collapse: collapse; table-layout: fixed; color: var(--guide-text); font-size: 15px; line-height: 26px; font-variant-numeric: tabular-nums; }
.reading-comparison th, .reading-comparison td { vertical-align: top; padding: var(--guide-space-12) var(--guide-space-16); border-bottom: 1px solid var(--guide-border); text-align: left; overflow-wrap: break-word; }
.reading-comparison th { font-weight: 500; }
.reading-comparison thead th { background: var(--guide-surface-subtle); border-top: 1px solid var(--guide-border); }
.reading-comparison thead th:first-child { width: 128px; }
.reading-comparison td { color: var(--guide-muted); }
.comparison-term { display: none; }
.comparison-value { min-width: 0; }
.reading-end { margin-top: var(--guide-space-32); padding-top: var(--guide-space-16); border-top: 1px solid var(--guide-border); }
.read-link { display: inline-flex; align-items: center; min-height: 44px; font-weight: 500; }
.guide-arrow { width: 18px; height: 18px; fill: currentColor; vertical-align: middle; margin-left: var(--guide-space-8); }
.guide-arrow.reverse { transform: rotate(180deg); margin: 0 var(--guide-space-8) 0 0; }
.guide-cta { max-width: 1024px; margin: auto; padding: var(--guide-space-24) var(--guide-space-32); background: var(--guide-surface-subtle); border-radius: 6px; display: flex; align-items: center; justify-content: space-between; gap: var(--guide-space-24); }
.guide-cta h2 { font-size: 20px; line-height: 30px; font-weight: 500; margin-bottom: var(--guide-space-8); }
.guide-cta p { color: var(--guide-muted); font-size: 15px; }
.cta-actions { display: flex; align-items: center; flex-wrap: wrap; gap: var(--guide-space-12) var(--guide-space-24); }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; padding: var(--guide-space-8) var(--guide-space-24); border: 0; border-radius: 6px; font-size: 15px; font-weight: 500; }
.button.primary { background: #0084ff; color: var(--guide-white); }
.guide-mobile-nav { display: none; }
.mobile-guide-footer { max-width: 720px; margin: auto; padding: var(--guide-space-20) var(--guide-space-20) var(--guide-space-32); border-top: 1px solid var(--guide-border); color: var(--guide-muted); font-size: 13px; }
.mobile-guide-footer > a { display: inline-flex; align-items: center; min-height: 44px; margin-right: var(--guide-space-16); }
.mobile-guide-footer p { margin-top: var(--guide-space-12); }
@media (hover: hover) and (pointer: fine) {
  .reading-toc a:hover { color: var(--guide-link); background: var(--guide-white); text-decoration: underline; text-underline-offset: 4px; }
  .reading-actions a:hover, .reading-body a:hover, .read-link:hover { color: var(--guide-ink); text-decoration-thickness: 2px; }
  .button.primary:hover { background: var(--guide-link); }
}
.reading-toc a:active { background: var(--guide-line); }
.reading-actions a:active, .reading-body a:active { color: var(--guide-ink); }
.button.primary:active { background: var(--guide-ink); }
@media (max-width: 1000px) {
  .reading { grid-template-columns: minmax(0, 760px); max-width: 760px; }
  .reading-heading, .reading-body { grid-column: 1; }
  .reading-toc { position: static; grid-column: 1; grid-row: auto; margin-bottom: var(--guide-space-32); }
  .reading-toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--guide-space-4) var(--guide-space-12); }
  .reading-toc a[aria-current="location"]::before { display: none; }
  .guide-cta { align-items: flex-start; flex-wrap: wrap; }
}
body[data-reading-view="mobile"] .guide-main { width: 100%; max-width: 720px; padding: var(--guide-space-20); margin: 0 auto var(--guide-space-24); }
body[data-reading-view="mobile"] .reading { display: block; margin: 0; }
body[data-reading-view="mobile"] .reading-heading { border: 0; padding-bottom: 0; margin-bottom: var(--guide-space-20); }
body[data-reading-view="mobile"] .reading-heading .category { margin-bottom: var(--guide-space-8); font-size: 13px; }
body[data-reading-view="mobile"] .reading h1 { font-size: 22px; line-height: 32px; }
body[data-reading-view="mobile"] .intro { margin-top: var(--guide-space-12); }
body[data-reading-view="mobile"] .reading-actions { gap: 0 var(--guide-space-20); margin-top: var(--guide-space-12); }
body[data-reading-view="mobile"] .reading-actions a { font-size: 14px; }
body[data-reading-view="mobile"] .reading-toc { position: static; padding: var(--guide-space-16) var(--guide-space-12); margin-bottom: var(--guide-space-32); }
body[data-reading-view="mobile"] .reading-toc-title { margin-bottom: var(--guide-space-8); }
body[data-reading-view="mobile"] .reading-toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--guide-space-4) var(--guide-space-8); }
body[data-reading-view="mobile"] .reading-toc a { padding: var(--guide-space-8) var(--guide-space-4); }
body[data-reading-view="mobile"] .reading-toc a[aria-current="location"]::before { display: none; }
body[data-reading-view="mobile"] .reading-body h2 { font-size: 20px; line-height: 30px; }
body[data-reading-view="mobile"] .reading-body h2::before { height: 20px; top: 5px; }
body[data-reading-view="mobile"] .reading-body section { scroll-margin-top: 72px; }
body[data-reading-view="mobile"] .guide-cta { padding: var(--guide-space-24) var(--guide-space-20); }
@media (max-width: 767px) {
  body[data-reading-view="desktop"] .guide-main { width: calc(100% - 40px); }
  body[data-reading-view="desktop"] .reading h1 { font-size: 24px; line-height: 36px; }
  .reading-comparison { position: relative; display: grid; grid-template-columns: minmax(0, 1fr); font-size: 14px; line-height: 24px; }
  .reading-comparison thead, .reading-comparison tbody, .reading-comparison tr { display: contents; }
  .reading-comparison thead th:first-child, .reading-comparison tbody th { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); padding: 0; border: 0; }
  .reading-comparison thead th:nth-child(2) { grid-row: 1; }
  .reading-comparison thead th:nth-child(3) { grid-row: calc(var(--comparison-rows) + 3); margin-top: var(--guide-space-24); }
  .reading-comparison thead th:not(:first-child) { grid-column: 1; padding: var(--guide-space-12); border-top: 0; background: var(--guide-surface-subtle); color: var(--guide-link); }
  .reading-comparison td { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: var(--guide-space-12); grid-column: 1; padding: var(--guide-space-12); }
  .reading-comparison td[data-direction="down"] { grid-row: calc(var(--comparison-row) + 1); }
  .reading-comparison td[data-direction="up"] { grid-row: calc(var(--comparison-row) + var(--comparison-rows) + 3); }
  .comparison-term { display: block; color: var(--guide-text); font-weight: 500; }
  .reading-comparison a { display: inline-flex; align-items: center; min-height: 44px; }
}
@media (max-width: 359px) {
  body[data-reading-view="mobile"] .guide-main { padding: var(--guide-space-16); }
  .reading-comparison td { grid-template-columns: 72px minmax(0, 1fr); gap: var(--guide-space-8); }
}