.knowledge-main { overflow: visible; }
.knowledge-hero { padding: 72px 20px 40px; border-bottom: 1px solid var(--line); }
.knowledge-wrap { width: min(820px, 100%); margin: 0 auto; }
.knowledge-kicker { margin: 0 0 14px; color: var(--blue); font-size: 13px; font-weight: 700; letter-spacing: .02em; }
.knowledge-hero h1 { max-width: 760px; margin: 0; color: var(--text-strong); font-size: clamp(32px, 4vw, 48px); line-height: 1.22; letter-spacing: -.025em; }
.knowledge-lead { max-width: 720px; margin: 18px 0 0; color: var(--muted); font-size: 17px; line-height: 1.8; }
.knowledge-meta { margin: 18px 0 0; color: var(--quiet); font-size: 13px; }
.knowledge-article { width: min(820px, calc(100% - 40px)); margin: 0 auto; padding: 44px 0 80px; }
.knowledge-article h2 { margin: 46px 0 14px; color: var(--text-strong); font-size: 25px; line-height: 1.35; letter-spacing: -.015em; }
.knowledge-article h2:first-child { margin-top: 0; }
.knowledge-article h3 { margin: 26px 0 8px; color: var(--text-strong); font-size: 18px; line-height: 1.45; }
.knowledge-article p, .knowledge-article li { color: var(--muted); font-size: 16px; line-height: 1.85; }
.knowledge-article p { margin: 0 0 16px; }
.knowledge-article ul, .knowledge-article ol { padding-left: 1.35em; margin: 0 0 18px; }
.knowledge-article li + li { margin-top: 7px; }
.knowledge-article a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.knowledge-note { margin: 28px 0; padding: 18px 20px; border: 1px solid color-mix(in srgb, var(--blue) 22%, var(--line)); border-radius: 12px; background: var(--blue-soft); }
.knowledge-note p { margin: 0; color: var(--text); }
.knowledge-callout { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; margin-top: 42px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); box-shadow: var(--shadow); }
.knowledge-callout strong { color: var(--text-strong); font-size: 17px; }
.knowledge-callout a { display: inline-flex; align-items: center; min-height: 40px; padding: 0 16px; border-radius: 9px; background: var(--button-bg); color: #fff; font-size: 14px; font-weight: 700; text-decoration: none; }
.knowledge-callout a:hover { background: var(--button-hover); }
.source-list { margin-top: 14px; padding-top: 20px; border-top: 1px solid var(--line); }
.site-header nav a.active::after { transform: scaleX(1); }
@media (max-width: 720px) {
  .site-header nav { gap: 16px; }
  .site-header nav a { font-size: 13px; }
  .site-header nav a:nth-child(2), .site-header nav a:nth-child(4) { display: none; }
  .knowledge-hero { padding: 46px 20px 30px; }
  .knowledge-article { padding-top: 32px; }
  .knowledge-article h2 { margin-top: 36px; font-size: 23px; }
  .knowledge-article p, .knowledge-article li { font-size: 15px; }
}