* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  background: #f8f9fa;
  color: #212529;
  line-height: 1.75;
}

header {
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

header .logo {
  font-size: 20px;
}

header .app-name {
  font-size: 16px;
  font-weight: 700;
  color: #2e7d32;
}

nav {
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  padding: 0 24px;
  display: flex;
  gap: 0;
}

nav a {
  display: inline-block;
  padding: 12px 16px;
  color: #6b7280;
  text-decoration: none;
  font-size: 14px;
  border-bottom: 2px solid transparent;
}

nav a.active,
nav a:hover {
  color: #2e7d32;
  border-bottom-color: #2e7d32;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.meta {
  font-size: 13px;
  color: #9ca3af;
  margin-bottom: 24px;
}

.preamble {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  padding: 18px 20px;
  font-size: 14px;
  margin-bottom: 36px;
  color: #15803d;
}

.section {
  margin-bottom: 32px;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.section-badge {
  background: #2e7d32;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.section-title {
  font-size: 17px;
  font-weight: 700;
}

.section-body {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 13.5px;
  white-space: pre-wrap;
}

.contact-box {
  background: #f3f4f6;
  border-radius: 10px;
  padding: 18px 20px;
  font-size: 13.5px;
  margin-top: 40px;
}

.contact-box h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}

footer {
  text-align: center;
  padding: 24px;
  font-size: 12px;
  color: #9ca3af;
  border-top: 1px solid #e5e7eb;
  background: #fff;
}