*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #1a5276;
  --primary-dark: #0e3a54;
  --accent: #e74c3c;
  --green: #27ae60;
  --gold: #d4a029;
  --text: #2c3e50;
  --text-light: #666;
  --bg-light: #f7f8fa;
  --white: #fff;
}
body { font-family: 'Noto Sans JP', sans-serif; color: var(--text); line-height: 2; }

.header {
  background: var(--white);
  padding: 14px 0;
  border-bottom: 1px solid #eee;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 16px;
}
.header .back { font-size: 14px; color: var(--text-light); }

.article {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}
.article h1 {
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 900;
  line-height: 1.6;
  margin-bottom: 12px;
  color: var(--primary);
}
.article-meta {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid #eee;
}
.article h2 {
  font-size: 22px;
  font-weight: 900;
  color: var(--primary);
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--primary);
}
.article h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--text);
}
.article p {
  margin-bottom: 20px;
  font-size: 16px;
}
.article ul, .article ol {
  margin: 0 0 20px 24px;
  font-size: 16px;
}
.article li { margin-bottom: 8px; }
.article a { color: var(--primary); }

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0 28px;
  font-size: 15px;
}
.article th, .article td {
  border: 1px solid #ddd;
  padding: 12px 16px;
  text-align: left;
}
.article th {
  background: var(--primary);
  color: white;
  font-weight: 700;
}
.article tr:nth-child(even) { background: var(--bg-light); }

.highlight-box {
  background: #fef9e7;
  border-left: 4px solid #f1c40f;
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 8px 8px 0;
}
.highlight-box p { margin-bottom: 0; }

.cost-box {
  background: linear-gradient(135deg, var(--accent), #c0392b);
  color: white;
  padding: 24px 28px;
  border-radius: 12px;
  text-align: center;
  margin: 28px 0;
}
.cost-box .big { font-size: 32px; font-weight: 900; }

.solution-box {
  background: linear-gradient(135deg, var(--green), #2ecc71);
  color: white;
  padding: 24px 28px;
  border-radius: 12px;
  text-align: center;
  margin: 28px 0;
}
.solution-box .big { font-size: 24px; font-weight: 900; }
.solution-box p { margin-bottom: 4px; }

.cta-box {
  background: var(--bg-light);
  border: 2px solid var(--primary);
  border-radius: 16px;
  padding: 32px 28px;
  text-align: center;
  margin: 40px 0;
}
.cta-box h3 {
  color: var(--primary);
  font-size: 20px;
  margin-bottom: 12px;
}
.cta-box p { font-size: 15px; color: var(--text-light); margin-bottom: 20px; }
.cta-box > a {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 14px 36px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 16px;
}
.cta-box .phone { font-size: 22px; font-weight: 900; display: block; margin-top: 4px; }
.cta-box .sub-links {
  margin-top: 16px;
  font-size: 14px;
}
.cta-box .sub-links a {
  background: #06C755;
  padding: 10px 24px;
  font-size: 14px;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  display: inline-block;
  font-weight: 700;
}
.cta-box .cta-foot {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 12px;
  margin-bottom: 0;
}

.related-articles {
  background: var(--bg-light);
  padding: 28px 28px;
  border-radius: 12px;
  margin-top: 40px;
}
.related-articles h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 16px;
}
.related-articles ul {
  margin: 0;
  list-style: none;
}
.related-articles li {
  padding: 10px 0;
  border-bottom: 1px solid #e5e5e5;
}
.related-articles li:last-child { border-bottom: none; }
.related-articles a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
}
.related-articles a:hover { text-decoration: underline; }

.footer {
  background: #111;
  color: rgba(255,255,255,0.5);
  text-align: center;
  padding: 32px 20px;
  font-size: 13px;
  line-height: 2;
}
.footer a { color: rgba(255,255,255,0.7); text-decoration: none; }