/* Shared navigation and reading experience across the blog. */
a:focus-visible, summary:focus-visible { outline: 3px solid var(--sky); outline-offset: 5px; }
[id] { scroll-margin-top: 150px; }
.skip-link { position: fixed; top: -80px; left: 16px; z-index: 200; padding: 12px 20px; background: var(--navy); color: white; }
.skip-link:focus { top: 12px; }
.site-nav { gap: 24px; }
.site-nav .nav-links { gap: 24px; }
.site-nav .nav-links a { min-height: 44px; display: inline-flex; align-items: center; }
.site-nav .nav-links .home-link { color: var(--navy); font-weight: 500; }
.site-nav [aria-current="page"] { text-decoration: underline; text-underline-offset: 6px; color: var(--navy); }
.breadcrumb { font: 12px var(--mono); line-height: 1.8; margin-bottom: 28px; color: var(--muted); }
.breadcrumb a { display: inline-block; padding: 8px 0; color: var(--blue); text-underline-offset: 4px; }
.head { max-width: 1120px; padding-top: 40px; }
.head h1 { max-width: 780px; font-size: clamp(36px,5vw,56px); }
.head p { max-width: 700px; }
.posts { max-width: 1120px; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.post-card, .post-card:first-child { padding: 30px; border: 1px solid var(--border); border-radius: 12px; background: #fff; display: flex; flex-direction: column; transition: border-color .2s, box-shadow .2s; }
.post-card:hover { padding-left: 30px; border-color: var(--blue); box-shadow: 0 8px 24px rgba(11,30,61,.07); }
.post-card:first-child { grid-column: 1 / -1; background: var(--paper); }
.post-card:first-child h2 { font-size: clamp(28px,3.5vw,38px); max-width: 850px; }
.post-card .pc-meta { flex-wrap: wrap; gap: 6px 14px; }
.post-card .pc-read { margin-top: auto; padding-top: 12px; }
.article-wrap { max-width: 800px; }
.article-body { line-height: 1.85; overflow-wrap: anywhere; }
.reading-next { border-top: 1px solid var(--border); padding-top: 32px; margin-top: 48px; }
.reading-actions { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; margin-bottom: 32px; }
.reading-actions a { color: var(--blue); padding: 10px 0; text-underline-offset: 4px; }
.reading-next h2 { color: var(--navy); font-size: 28px; margin-bottom: 20px; }
.reading-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 20px; }
.reading-card { padding: 24px; display: flex; flex-direction: column; gap: 16px; background: var(--paper); border: 1px solid var(--border); border-radius: 10px; color: var(--navy); text-decoration: none; }
.reading-card:hover { border-color: var(--blue); }
.reading-card span { font: 12px var(--mono); color: var(--blue); }
.reading-card strong { font: 400 21px/1.4 var(--serif); }
.reading-card span:last-child { margin-top: auto; }
footer .f-bottom { color: #b9c5d5; }
footer a { display: inline-block; padding: 8px 4px; }
@media(max-width:800px) {
  .site-nav { flex-wrap: wrap; padding: 12px 20px; gap: 8px; }
  .site-nav .nav-links { display: flex; width: 100%; gap: 8px 20px; flex-wrap: wrap; }
  .site-nav .nav-links a:not(.nav-cta) { display: inline-flex; }
  .site-nav .nav-links a { font-size: 13px; }
  .site-nav .nav-links .nav-cta { margin-left: auto; }
  .site-nav .nav-logo-sub { display: none; }
  .posts { grid-template-columns: 1fr; }
  .head { padding-top: 32px; }
}
@media(max-width:480px) {
  .site-nav .nav-links { gap: 4px 12px; }
  [id] { scroll-margin-top: 150px; }
  .post-card, .post-card:first-child { padding: 24px; }
  .post-card:hover { padding-left: 24px; }
  .reading-grid { grid-template-columns: 1fr; }
  footer { padding: 32px 20px; }
}
@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }