:root {
  --ink: #102a43;
  --muted: #5d7188;
  --brand: #0b63ce;
  --line: #d9e6f7;
  --bg: #eef4fb;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif; background: var(--bg); color: var(--ink); }
a { color: inherit; text-decoration: none; }
.article-header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 18px clamp(20px, 5vw, 72px); background: rgba(255,255,255,.92); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 2; }
.brand { color: var(--brand); font-size: 22px; font-weight: 800; }
.article-header nav { display: flex; flex-wrap: wrap; gap: 18px; color: var(--muted); font-size: 14px; }
.article-shell { display: grid; grid-template-columns: minmax(180px, 260px) minmax(0, 860px); gap: clamp(24px, 5vw, 64px); max-width: 1240px; margin: 0 auto; padding: clamp(32px, 6vw, 72px) 20px; }
.article-aside { align-self: start; position: sticky; top: 92px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.article-aside p { margin: 0 0 10px; color: var(--brand); font-weight: 700; }
.article-aside strong { display: block; margin-bottom: 8px; font-size: 20px; line-height: 1.4; }
.article-aside span { color: var(--muted); }
.article-body { padding: clamp(28px, 4vw, 48px); border-radius: 18px; background: #fff; box-shadow: 0 18px 48px rgba(15, 38, 70, .11); }
.eyebrow { margin: 0 0 12px; color: var(--brand); font-weight: 800; }
h1 { margin: 0 0 18px; font-size: clamp(32px, 4vw, 48px); line-height: 1.2; letter-spacing: 0; }
.lead { margin: 0 0 30px; color: var(--muted); font-size: 18px; line-height: 1.85; }
.article-body h2 { margin: 42px 0 18px; padding-bottom: 10px; border-bottom: 1px solid var(--line); color: var(--ink); font-size: 26px; line-height: 1.35; }
.article-body p { margin: 0 0 18px; color: #24364b; font-size: 16px; line-height: 1.9; }
.article-body figure { margin: 30px 0 34px; }
.article-body img { display: block; width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); }
.article-body figcaption { margin-top: 10px; text-align: center; color: var(--muted); font-size: 13px; line-height: 1.6; }
.article-body table { width: 100%; border-collapse: collapse; margin: 18px 0 28px; color: #24364b; font-size: 14px; line-height: 1.65; }
.article-body th, .article-body td { padding: 11px 12px; border: 1px solid #d6e6f8; text-align: left; vertical-align: top; }
.article-body th { color: var(--brand); background: #edf5ff; }
.article-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 30px; }
.article-actions a { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 10px 16px; border-radius: 8px; font-weight: 700; border: 1px solid var(--line); }
.article-actions .primary { color: #f8fbff; background: var(--brand); border-color: var(--brand); }
.article-actions .secondary { color: var(--brand); background: #f5f9ff; }
.toc-list { margin: 14px 0 0; padding-left: 18px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.toc-list a { color: var(--muted); }
.insight-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 24px 0 30px; }
.insight-strip div { padding: 16px; border: 1px solid #d7e7f8; border-radius: 10px; background: #f5f9ff; }
.insight-strip span { display: block; margin-bottom: 6px; color: var(--brand); font-size: 13px; font-weight: 800; }
.insight-strip strong { display: block; color: var(--ink); font-size: 16px; line-height: 1.55; }
.article-body ul.check-list { margin: 10px 0 26px; padding: 0; list-style: none; }
.article-body ul.check-list li { position: relative; margin: 0 0 10px; padding: 12px 14px 12px 38px; border: 1px solid #d8e7f8; border-radius: 8px; background: #fbfdff; color: #24364b; line-height: 1.75; }
.article-body ul.check-list li::before { content: ""; position: absolute; left: 16px; top: 21px; width: 8px; height: 8px; border-radius: 50%; background: var(--brand); }
.related-article-grid, .article-index-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 22px 0 8px; }
.related-article-grid a, .article-index-card { display: flex; flex-direction: column; gap: 8px; padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: #fbfdff; }
.related-article-grid strong, .article-index-card strong { color: var(--ink); font-size: 17px; line-height: 1.45; }
.related-article-grid span, .article-index-card span { color: var(--brand); font-size: 14px; font-weight: 700; }
.article-index-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.index-summary { margin: 24px 0 30px; padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: #f7fbff; }
.index-summary p { margin: 0; color: #334d68; line-height: 1.85; }
.source-note { margin-top: 28px; padding: 18px; border: 1px solid #d7e7f8; border-radius: 10px; background: #f5f9ff; color: #334d68; }
.source-note p { margin: 0; }
.article-footer { padding: 28px 20px 42px; text-align: center; color: var(--muted); }
@media (max-width: 880px) {
  .article-header { align-items: flex-start; flex-direction: column; }
  .article-shell { display: block; padding-top: 28px; }
  .article-aside { position: static; margin-bottom: 18px; }
  .article-body { padding: 24px 18px; border-radius: 14px; }
  .insight-strip { grid-template-columns: 1fr; }
  .article-actions a { width: 100%; }
}