:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f6f7f8;
  color: #17191c;
}

* { box-sizing: border-box; }

body { margin: 0; }

.seo-shell {
  width: min(100% - 32px, 960px);
  margin: 0 auto;
  padding: 24px 0 56px;
}

.seo-header,
.seo-section,
.seo-footer {
  background: #fff;
  border: 1px solid #e1e4e8;
  border-radius: 12px;
  padding: clamp(22px, 4vw, 44px);
  box-shadow: 0 2px 8px rgb(18 28 45 / 5%);
}

.seo-header { border-top: 4px solid #465b78; }

.seo-kicker {
  margin: 0 0 12px;
  color: #465b78;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1, h2 { margin: 0; line-height: 1.25; }
h1 { max-width: 780px; font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.9rem); }

.seo-lead {
  max-width: 760px;
  margin: 18px 0 0;
  color: #535b66;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.7;
}

.seo-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.seo-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 8px;
  background: #17191c;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}
.seo-button.secondary { background: #eef1f4; color: #17191c; }

.seo-section { margin-top: 18px; }
.seo-section p, .seo-section li, .seo-footer p { color: #535b66; line-height: 1.7; }
.seo-section ul { margin: 18px 0 0; padding-left: 1.2rem; }
.seo-section li + li { margin-top: 8px; }

.seo-note {
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 3px solid #d8dee6;
  background: #f7f8fa;
  color: #535b66;
  line-height: 1.6;
}

.seo-footer { margin-top: 18px; box-shadow: none; }
.seo-footer nav { display: flex; flex-wrap: wrap; gap: 14px 20px; margin-top: 14px; }
.seo-footer a { color: #465b78; font-weight: 600; }

@media (max-width: 600px) {
  .seo-shell { width: min(100% - 20px, 960px); padding-top: 10px; }
  .seo-header, .seo-section, .seo-footer { border-radius: 10px; padding: 22px 18px; }
  .seo-actions { align-items: stretch; flex-direction: column; }
  .seo-button { width: 100%; }
}