.seo-article {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 16px;
}
.seo-article__header { margin: 24px 0 18px; }
.seo-article__lead {
  font-size: 15px;
  line-height: 1.9;
  color: #444;
  margin: 12px 0 0;
}
.seo-article h1 {
  font-size: 26px;
  line-height: 1.35;
  margin: 0 0 10px;
}
.seo-article h2 {
  font-size: 20px;
  line-height: 1.45;
  margin: 28px 0 10px;
}
.seo-article p,
.seo-article li {
  font-size: 15px;
  line-height: 1.9;
}
.seo-article ul { padding-left: 1.2em; }
.seo-article__section { margin: 0 0 14px; }

/* CTA background accents */
.cta-negative { background: #fff3f3; }
.cta-price    { background: #f3f9ff; }
.cta-vendor   { background: #f4fff7; }
.cta-guide    { background: #fdf9f3; }
.cta-design   { background: #f7f5ff; }
.cta-trouble  { background: #fff8e6; }
.cta-trust    { background: #eef7f7; }
.cta-emotion  { background: #fff6fb; }

/* fallback button styles (existing) */
.btn {
  display: inline-block;
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}
/* --- shared aliases: button variants (compat) --- */
.btn--primary { background: var(--accent); color: #fff; box-shadow: 0 12px 24px rgba(31, 111, 139, 0.25); }
.btn--primary:hover { background: #165466; }
.btn--ghost { border: 1px solid var(--line); background: #fff; }
.btn--line { background: var(--accent-2); color: #3a2f0b; }

/* --- howto seo-article addon (shared) --- */
.seo-article__checkpoint,
.seo-article__caution{
  border-radius: 14px;
  padding: 14px 16px;
  margin: 16px 0;
  line-height: 1.8;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.seo-article__checkpoint{ font-weight: 700; }
.seo-article__caution{ background: rgba(31, 111, 139, 0.06); }
.seo-article__cta{
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.seo-article__cta .btn{ margin-top: 10px; }