body { max-width: 960px; }
.article-nav { display: flex; justify-content: space-between; gap: 18px; margin-bottom: 22px; font-size: 13px; }
a { color: var(--accent); text-underline-offset: 3px; }
.article-nav a { text-decoration: none; }
.article-nav a:hover { text-decoration: underline; }
.method-article h2 { margin-bottom: 18px; font-size: 22px; }
.method-article p { color: #4a625d; font-size: 15px; line-height: 1.9; }
.method-article p:last-child { margin-bottom: 0; }
.takeaway { border-left: 3px solid var(--accent); padding: 12px 18px; background: #f0f6f1; font-weight: 600; margin-top: 20px; }
.features dt { font-weight: 600; margin-top: 20px; }
.features dd { margin: 6px 0 0; font-size: 15px; line-height: 1.9; color: #4a625d; }
.comparison-wrap { overflow-x: auto; }
.comparison { border-collapse: collapse; width: 100%; min-width: 580px; font-size: 14px; line-height: 1.8; }
.comparison th, .comparison td { padding: 14px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.comparison th { background: #f0f6f1; }
.comparison td:first-child { min-width: 120px; font-weight: 600; }
.calculation-steps { padding-left: 24px; }
.calculation-steps li { padding-left: 8px; margin: 24px 0; }
.calculation-steps h3 { font-size: 17px; margin-bottom: 8px; }
.formula { padding: 14px 18px; border-radius: 10px; background: #f0f6f1; font-size: 14px; line-height: 2; overflow-wrap: anywhere; }
.sources p { font-size: 13px; }
.return-button { display: block; text-align: center; padding: 16px; border-radius: 10px; background: var(--accent); color: white; text-decoration: none; margin: 28px 0; }
section[id], p[id] { scroll-margin-top: 24px; }
@media (max-width: 600px) {
  .method-article h2 { font-size: 19px; }
  .method-article p, .features dd { font-size: 14px; }
  .calculation-steps { padding-left: 18px; }
  .calculation-steps li { padding-left: 2px; }
}