.source-guide .ap-hero { grid-template-columns: 1fr 1fr; gap: 40px; }
.source-guide .ap-hero h1 { font-size: clamp(30px, 3vw, 42px); }
.source-guide .ap-subtitle { font-size: 20px; }
.source-guide .ap-photo img { display: block; height: auto; aspect-ratio: 1672 / 941; object-fit: contain; }
.source-guide .ap-photo a { display: block; }
.source-guide .ap-photo figcaption a { display: inline; }
.os-stages { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ap-line); border-bottom: 1px solid var(--ap-line); }
.os-stages a { padding: 22px 28px; text-decoration: none; border-left: 1px solid var(--ap-line); color: var(--ap-deep); }
.os-stages a:first-child { border-left: 0; padding-left: 0; }
.os-stages span { display: block; color: var(--ap-muted); font-size: 12px; margin-bottom: 6px; }
.os-stages strong { font-size: 18px; }
.os-stages a:hover strong { text-decoration: underline; }
.source-guide .ap-layout { gap: 48px; grid-template-columns: 190px minmax(0, 1fr); }
.source-guide .os-prose p { margin: 0 0 18px; }
.source-guide .os-prose .os-lead { font-size: 17px; color: var(--ap-deep); font-weight: 600; }
.source-guide .os-prose h3 { font-size: 20px; margin: 28px 0 16px; line-height: 1.6; }
.source-guide .os-prose .os-key { display: grid; grid-template-columns: 105px minmax(0, 1fr); gap: 16px; margin-bottom: 18px; }
.os-key strong { color: var(--ap-deep); font-size: 14px; padding-top: 2px; }
.os-overview { display: grid; grid-template-columns: 1fr 1fr; gap: 0 28px; list-style: none; margin: 0; padding: 0; }
.os-overview li { border-bottom: 1px solid var(--ap-line); }
.os-overview a { display: block; color: var(--ap-ink); text-decoration: none; padding: 20px 0; }
.os-overview strong { display: block; font-size: 18px; color: var(--ap-deep); margin-bottom: 6px; }
.os-overview span { font-size: 14px; color: var(--ap-muted); }
.os-overview a:hover strong { text-decoration: underline; }
.os-list { padding-left: 1.4em; margin: 16px 0 24px; }
.os-list li { padding-left: 4px; margin-bottom: 10px; }
.source-guide .os-prose .ap-photo { margin: 24px 0 28px; }
.os-table { margin: 20px 0 30px; }
.os-table thead th { color: white; background: var(--ap-blue); }
.os-table th:first-child { width: 24%; }
.os-table th:last-child { width: auto; }
.os-reference { font-size: 13px; }
.source-guide .ap-related { padding-top: 30px; }
@media (max-width: 1000px) {
  .source-guide .ap-layout { grid-template-columns: 160px minmax(0, 1fr); gap: 28px; }
  .source-guide .ap-hero { gap: 26px; }
  .source-guide .os-prose .os-key { grid-template-columns: 1fr; gap: 4px; }
}
@media (max-width: 760px) {
  .source-guide .ap-hero { grid-template-columns: 1fr; }
  .source-guide .ap-hero h1 { font-size: 30px; }
  .source-guide .ap-subtitle { font-size: 18px; }
  .source-guide .ap-layout { grid-template-columns: 1fr; }
  .os-stages { grid-template-columns: 1fr; }
  .os-stages a, .os-stages a:first-child { padding: 13px 0; border: 0; display: grid; grid-template-columns: 100px 1fr; align-items: center; gap: 10px; }
  .os-stages a + a { border-top: 1px solid var(--ap-line); }
  .os-stages span { margin: 0; }
  .os-stages strong { font-size: 15px; }
  .os-overview { grid-template-columns: 1fr; }
  .os-overview a { padding: 14px 0; }
  .source-guide .os-prose h3 { font-size: 18px; }
  .source-guide .os-prose .os-lead { font-size: 16px; }
  .os-table th:first-child { width: 29%; }
}