:root {
  color: #0f172a;
  background: #f6f8fb;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #f6f8fb; }
a { color: #165dff; }

.seo-header {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid #e2e8f0;
  background: rgba(255, 255, 255, .96);
}

.seo-header__inner,
.seo-main,
.seo-footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.seo-header__inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.seo-brand {
  color: #0f172a;
  font-size: 19px;
  font-weight: 800;
  text-decoration: none;
}

.seo-nav { display: flex; flex-wrap: wrap; gap: 20px; }
.seo-nav a { color: #334155; font-weight: 600; text-decoration: none; }
.seo-main { padding: 64px 0; }
.seo-hero { max-width: 880px; padding: 44px 0 56px; }
.seo-kicker { color: #165dff; font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.seo-hero h1 { margin: 12px 0 18px; font-size: clamp(38px, 6vw, 68px); line-height: 1.04; letter-spacing: -.035em; }
.seo-hero p { max-width: 760px; color: #475569; font-size: 20px; line-height: 1.7; }
.seo-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.seo-button { display: inline-flex; min-height: 46px; align-items: center; padding: 0 20px; border-radius: 10px; background: #165dff; color: #fff; font-weight: 700; text-decoration: none; }
.seo-button--secondary { border: 1px solid #cbd5e1; background: #fff; color: #0f172a; }
.seo-section { padding: 42px 0; border-top: 1px solid #e2e8f0; }
.seo-section h2 { margin: 0 0 14px; font-size: clamp(28px, 4vw, 40px); }
.seo-section > p { max-width: 800px; color: #475569; line-height: 1.75; }
.seo-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 24px; }
.seo-card { padding: 24px; border: 1px solid #dbe3ef; border-radius: 16px; background: #fff; box-shadow: 0 12px 30px rgba(15, 23, 42, .045); }
.seo-card h2, .seo-card h3 { margin-top: 0; }
.seo-card p, .seo-card li { color: #475569; line-height: 1.65; }
.seo-card ul { padding-left: 20px; }
.seo-price { margin: 12px 0; font-size: 34px; font-weight: 850; }
.seo-example { padding: 22px; border-left: 4px solid #165dff; background: #eef4ff; color: #334155; line-height: 1.75; }
.seo-faq details { padding: 18px 0; border-bottom: 1px solid #e2e8f0; }
.seo-faq summary { cursor: pointer; font-weight: 750; }
.seo-faq p { color: #475569; line-height: 1.7; }
.seo-breadcrumb { margin-bottom: 30px; color: #64748b; font-size: 14px; }
.seo-breadcrumb a { color: #475569; }
.seo-legal { max-width: 860px; padding: 34px; border: 1px solid #dbe3ef; border-radius: 18px; background: #fff; }
.seo-legal h1 { font-size: clamp(36px, 5vw, 52px); }
.seo-legal h2 { margin-top: 38px; padding-top: 24px; border-top: 1px solid #e2e8f0; }
.seo-legal h3 { margin-top: 26px; }
.seo-legal p, .seo-legal li { color: #475569; line-height: 1.8; }
.seo-footer { padding: 32px 0 48px; border-top: 1px solid #e2e8f0; color: #64748b; }
.seo-footer nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 16px; }
.seo-footer a { color: #475569; }

@media (max-width: 800px) {
  .seo-header__inner { align-items: flex-start; flex-direction: column; padding: 16px 0; }
  .seo-grid { grid-template-columns: 1fr; }
  .seo-main { padding-top: 24px; }
  .seo-legal { padding: 22px; }
}