.article-page { padding: 30px 0 78px; background: var(--canvas); }
.breadcrumb { margin-bottom: 20px; color: var(--muted); font-size: 13px; }
.breadcrumb a:hover { color: var(--primary); }
.article-shell { display: grid; grid-template-columns: minmax(0, 1fr) 292px; gap: 42px; align-items: start; }
.article-document { min-width: 0; overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.article-header { padding: 44px 50px 34px; border-bottom: 1px solid var(--line); }
.article-code { margin: 0 0 11px; color: var(--accent); font-size: 13px; font-weight: 800; }
.article-header h1 { max-width: 820px; margin: 0; font-size: 36px; line-height: 1.35; }
.article-summary { max-width: 800px; margin: 17px 0 24px; color: var(--muted); font-size: 16px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 8px 26px; margin: 0; padding-top: 16px; border-top: 1px solid var(--line); }
.article-meta div { display: flex; min-width: 0; align-items: baseline; gap: 6px; }
.article-meta dt { color: var(--muted); font-size: 12px; }
.article-meta dt::after { content: "："; }
.article-meta dd { min-width: 0; margin: 0; font-size: 12px; overflow-wrap: anywhere; }
.article-meta a { color: var(--primary-dark); }

.article-notice { display: grid; grid-template-columns: 86px 1fr; gap: 18px; padding: 16px 50px; color: #554d35; background: var(--sun-soft); border-bottom: 1px solid #eee0b6; font-size: 13px; }
.article-notice strong { color: #8b4a33; }
.article-body { max-width: 860px; margin: 0 auto; padding: 40px 50px 48px; color: #2e3b41; font-size: 16px; line-height: 1.9; overflow-wrap: anywhere; }
.article-body h2 { margin: 42px 0 16px; padding-top: 19px; color: var(--ink); border-top: 1px solid var(--line); font-size: 25px; line-height: 1.45; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 30px 0 11px; color: var(--ink); font-size: 19px; line-height: 1.5; }
.article-body h4 { margin: 24px 0 9px; color: var(--ink); font-size: 16px; }
.article-body p { margin: 0 0 19px; }
.article-body a { color: var(--primary-dark); text-decoration: underline; text-decoration-color: #9fc7d1; text-underline-offset: 3px; }
.article-body a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.article-body ul, .article-body ol { margin: 0 0 23px; padding-left: 25px; }
.article-body li { margin: 7px 0; }
.article-body img { display: block; max-width: 100%; height: auto; }
.article-body figure, .article-body .article-figure { max-width: 100%; margin: 28px 0 30px; }
.article-body figure img, .article-body .article-figure img { width: 100%; border-radius: var(--radius); }
.article-body figcaption { margin-top: 8px; color: var(--muted); font-size: 12px; line-height: 1.65; }
.article-body table { display: block; width: 100%; max-width: 100%; margin: 24px 0; overflow-x: auto; border-collapse: collapse; font-size: 13px; white-space: nowrap; }
.article-body th, .article-body td { min-width: 110px; padding: 10px 12px; border: 1px solid var(--line); text-align: left; }
.article-body th { color: var(--primary-dark); background: var(--sky-soft); }
.article-body blockquote { margin: 25px 0; padding: 17px 20px; color: #485960; background: var(--sky-soft); border-left: 4px solid var(--primary); }
.article-body blockquote > :last-child { margin-bottom: 0; }
.article-body iframe, .article-body video { max-width: 100%; }

.article-related { padding: 30px 50px 36px; background: var(--canvas); border-top: 1px solid var(--line); }
.article-related__header { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 18px; }
.article-related__header .article-code { margin-bottom: 4px; }
.article-related__header h2 { margin: 0; font-size: 22px; }
.article-related__header > a { display: inline-flex; gap: 7px; color: var(--primary-dark); font-size: 13px; font-weight: 800; }
.article-related__header > a span { color: var(--accent); }
.article-related__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.article-related__item { min-width: 0; padding-top: 14px; border-top: 2px solid #b8d7df; }
.article-related__item > p { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 10px; margin: 0; font-size: 11px; }
.article-related__item > p a { color: var(--primary); font-weight: 700; }
.article-related__item time { color: var(--muted); }
.article-related__item h3 { margin: 8px 0 6px; font-size: 15px; line-height: 1.5; }
.article-related__item h3 a:hover { color: var(--primary); }
.article-related__item > span { display: block; color: var(--muted); font-size: 12px; line-height: 1.65; }
.article-related__empty { grid-column: 1 / -1; color: var(--muted); font-size: 12px; }
.article-related__item + .article-related__empty { display: none; }

.article-adjacent { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); }
.article-adjacent__item {
    min-width: 0;
    min-height: 50px;
    padding: 14px 18px;
    color: var(--primary-dark) !important;
    background: #fff !important;
    border-color: var(--line) !important;
    outline-color: var(--primary) !important;
    box-shadow: none !important;
    font-size: 13px;
}
.article-adjacent__item a, .article-adjacent__item span { color: inherit !important; }
.article-adjacent__item + .article-adjacent__item { border-left: 1px solid var(--line); }
.article-adjacent__item:hover, .article-adjacent__item:focus, .article-adjacent__item:focus-visible, .article-adjacent__item:focus-within {
    color: var(--primary-dark) !important;
    background: var(--sky-soft) !important;
    border-color: var(--primary) !important;
    box-shadow: inset 0 0 0 1px var(--primary) !important;
}

.article-rail { position: sticky; top: calc(var(--fixed-nav-height) + 18px); padding: 24px; background: var(--sky-soft); border: 1px solid #cfe4e9; border-radius: var(--radius); }
.article-rail h2 { margin: 0; font-size: 20px; }
.article-rail ol { margin: 15px 0 0; padding-left: 21px; color: var(--muted); font-size: 13px; }
.article-rail li { margin: 9px 0; }
.article-rail > a { display: flex; justify-content: space-between; gap: 12px; margin-top: 20px; padding-top: 15px; color: var(--primary-dark); border-top: 1px solid #c8dee3; font-size: 13px; font-weight: 800; }
.article-rail > a span { color: var(--accent); }

@media (max-width: 900px) {
    .article-shell { grid-template-columns: 1fr; gap: 34px; }
    .article-rail { position: static; }
    .article-related__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
    .article-page { padding: 22px 0 54px; }
    .breadcrumb { margin-bottom: 14px; }
    .article-header { padding: 28px 19px 23px; }
    .article-header h1 { font-size: 28px; }
    .article-summary { margin: 13px 0 20px; font-size: 15px; }
    .article-meta { gap: 8px 18px; }
    .article-meta div { flex: 1 1 calc(50% - 18px); }
    .article-notice { grid-template-columns: 1fr; gap: 3px; padding: 14px 19px; }
    .article-body { padding: 29px 19px 36px; font-size: 15px; line-height: 1.85; }
    .article-body h2 { margin-top: 34px; font-size: 22px; }
    .article-body h3 { font-size: 18px; }
    .article-body figure, .article-body .article-figure { margin: 23px 0 25px; }
    .article-related { padding: 25px 19px 30px; }
    .article-related__header { display: block; }
    .article-related__header > a { margin-top: 8px; }
    .article-related__grid { grid-template-columns: 1fr; gap: 16px; }
    .article-adjacent { grid-template-columns: 1fr; }
    .article-adjacent__item + .article-adjacent__item { border-top: 1px solid var(--line); border-left: 0; }
    .article-rail { padding: 21px; }
}