*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --seo-bg: #f4f7fb;
  --seo-card: #ffffff;
  --seo-border: #d9e3f0;
  --seo-text: #1d2939;
  --seo-muted: #52606d;
  --seo-accent: #b98608;
  --seo-accent-dark: #7a5600;
  --seo-navy: #0f172a;
  --seo-link: #0f4c81;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #eef4fb 0%, #f7f9fc 240px, #f4f7fb 100%);
  color: var(--seo-text);
  line-height: 1.65;
}

a {
  color: var(--seo-link);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.seo-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

.seo-header {
  padding: 18px 0 10px;
}

.seo-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.seo-logo {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--seo-navy);
  letter-spacing: 0.01em;
}

.seo-logo span {
  color: var(--seo-accent);
}

.seo-nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.seo-nav a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--seo-muted);
}

.seo-breadcrumbs {
  font-size: 0.84rem;
  color: var(--seo-muted);
  margin-bottom: 14px;
}

.seo-hero,
.seo-card {
  background: var(--seo-card);
  border: 1px solid var(--seo-border);
  border-radius: 18px;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.05);
}

.seo-hero {
  padding: 32px 28px;
  margin-bottom: 22px;
}

.seo-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  background: #fff8e1;
  color: var(--seo-accent-dark);
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.seo-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.12;
  color: var(--seo-navy);
}

.seo-lead {
  max-width: 860px;
  font-size: 1.02rem;
  color: var(--seo-muted);
  margin: 0 0 18px;
}

.seo-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 2.15fr) minmax(280px, 0.85fr);
}

.seo-main {
  display: grid;
  gap: 22px;
}

.seo-card {
  padding: 24px 24px 22px;
}

.seo-card h2 {
  margin: 0 0 12px;
  font-size: 1.28rem;
  color: var(--seo-navy);
}

.seo-card p,
.seo-card li {
  font-size: 0.98rem;
  color: var(--seo-text);
}

.seo-card ul,
.seo-card ol {
  margin: 0;
  padding-left: 20px;
}

.seo-card li + li {
  margin-top: 8px;
}

.seo-steps {
  display: grid;
  gap: 12px;
}

.seo-step {
  border: 1px solid var(--seo-border);
  border-radius: 14px;
  padding: 14px 16px;
  background: #fbfdff;
}

.seo-step strong {
  display: block;
  margin-bottom: 4px;
  color: var(--seo-navy);
}

.seo-sidebar {
  display: grid;
  gap: 18px;
  align-content: start;
}

.seo-sidebar h2 {
  margin-top: 0;
}

.seo-link-list,
.seo-faq-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.seo-link-list li + li,
.seo-faq-list li + li {
  margin-top: 10px;
}

.seo-link-list a {
  font-weight: 600;
}

.seo-note {
  border-left: 4px solid var(--seo-accent);
  background: #fffaf0;
  padding: 14px 16px;
  border-radius: 0 14px 14px 0;
  color: var(--seo-accent-dark);
}

.seo-metric {
  display: grid;
  gap: 10px;
}

.seo-metric div {
  border: 1px solid var(--seo-border);
  border-radius: 14px;
  padding: 12px 14px;
  background: #fbfdff;
}

.seo-metric strong {
  display: block;
  margin-bottom: 3px;
  color: var(--seo-navy);
}

.seo-footer {
  margin-top: 28px;
  padding: 18px 0 0;
  font-size: 0.88rem;
  color: var(--seo-muted);
}

.seo-footer-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 10px;
}

@media (max-width: 860px) {
  .seo-grid {
    grid-template-columns: 1fr;
  }

  .seo-hero,
  .seo-card {
    padding: 22px 18px;
  }
}