:root {
  --seo-bg: #f7faf9;
  --seo-surface: #ffffff;
  --seo-ink: #182321;
  --seo-muted: #5f6f6a;
  --seo-border: #dfe8e4;
  --seo-primary: #0f766e;
  --seo-primary-dark: #115e59;
  --seo-accent: #f59e0b;
  --seo-soft: #e9f5f2;
}

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

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;
  color: var(--seo-ink);
  background: var(--seo-bg);
  line-height: 1.8;
}

a {
  color: var(--seo-primary);
}

.seo-site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--seo-border);
}

.seo-header-inner,
.seo-container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.seo-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 68px;
}

.seo-logo {
  color: var(--seo-ink);
  font-weight: 800;
  text-decoration: none;
}

.seo-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  justify-content: flex-end;
  font-size: 0.92rem;
}

.seo-nav a {
  color: var(--seo-muted);
  text-decoration: none;
}

.seo-nav a:hover {
  color: var(--seo-primary);
}

.seo-hero {
  padding: 64px 0 44px;
  background: linear-gradient(180deg, #ffffff 0%, var(--seo-bg) 100%);
}

.seo-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  align-items: center;
  gap: 42px;
}

.seo-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  margin: 0 0 14px;
  padding: 4px 12px;
  border: 1px solid #b7ddd6;
  border-radius: 999px;
  background: var(--seo-soft);
  color: var(--seo-primary-dark);
  font-size: 0.86rem;
  font-weight: 700;
}

.seo-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.22;
  letter-spacing: 0;
}

.seo-lead {
  max-width: 680px;
  margin: 0 0 24px;
  color: var(--seo-muted);
  font-size: 1.04rem;
}

.seo-cta-row,
.seo-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.seo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid var(--seo-primary);
  border-radius: 8px;
  background: var(--seo-primary);
  color: #ffffff;
  font-weight: 800;
  text-decoration: none;
}

.seo-btn:hover {
  background: var(--seo-primary-dark);
}

.seo-btn-secondary {
  background: #ffffff;
  color: var(--seo-primary);
}

.seo-btn-secondary:hover {
  background: var(--seo-soft);
}

.seo-hero-panel {
  border: 1px solid var(--seo-border);
  border-radius: 8px;
  background: var(--seo-surface);
  padding: 22px;
  box-shadow: 0 18px 45px rgba(24, 35, 33, 0.08);
}

.seo-hero-image {
  display: block;
  margin-bottom: 16px;
}

.seo-hero-image img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--seo-border);
  border-radius: 8px;
}

.seo-mini-chart {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

.seo-mini-node {
  min-height: 62px;
  border: 1px solid var(--seo-border);
  border-radius: 8px;
  background: #fdfefe;
  padding: 10px 12px;
  font-weight: 800;
}

.seo-mini-node span {
  display: block;
  margin-top: 2px;
  color: var(--seo-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.seo-mini-line {
  grid-column: 1 / -1;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--seo-primary), transparent);
}

.seo-panel-note {
  margin: 0;
  color: var(--seo-muted);
  font-size: 0.9rem;
}

.seo-section {
  padding: 48px 0;
}

.seo-section:nth-of-type(even) {
  background: #ffffff;
}

.seo-section h2 {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.35;
}

.seo-section p {
  color: var(--seo-muted);
}

.seo-card-grid,
.seo-template-grid,
.seo-faq-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.seo-card,
.seo-template-card,
.seo-faq-card {
  border: 1px solid var(--seo-border);
  border-radius: 8px;
  background: var(--seo-surface);
  padding: 20px;
}

.seo-card h3,
.seo-template-card h3,
.seo-faq-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.seo-card p,
.seo-template-card p,
.seo-faq-card p {
  margin: 0;
  font-size: 0.94rem;
}

.seo-template-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.seo-template-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.seo-tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--seo-soft);
  color: var(--seo-primary-dark);
  font-size: 0.8rem;
  font-weight: 700;
}

.seo-steps {
  margin: 20px 0 0;
  padding-left: 1.4rem;
}

.seo-steps li {
  margin-bottom: 10px;
}

.seo-callout {
  border-left: 4px solid var(--seo-accent);
  background: #fff8eb;
  padding: 16px 18px;
  border-radius: 8px;
  color: #6f4a08;
}

.seo-footer {
  border-top: 1px solid var(--seo-border);
  background: #ffffff;
  padding: 28px 0;
  text-align: center;
  color: var(--seo-muted);
  font-size: 0.88rem;
}

.seo-footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
  margin-bottom: 12px;
}

.seo-footer-links a {
  text-decoration: none;
}

@media (max-width: 820px) {
  .seo-header-inner,
  .seo-hero-grid {
    display: block;
  }

  .seo-nav {
    justify-content: flex-start;
    margin-top: 10px;
  }

  .seo-hero {
    padding: 44px 0 32px;
  }

  .seo-hero-panel {
    margin-top: 28px;
  }

  .seo-card-grid,
  .seo-template-grid,
  .seo-faq-grid {
    grid-template-columns: 1fr;
  }
}