* {
  box-sizing: border-box;
}

body {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px;
  color: #333;
  background-color: #f8f9fa;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Roboto", sans-serif;
  line-height: 1.7;
}

.container {
  padding: 40px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.page-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

h1 {
  margin: 0 0 8px;
  padding-bottom: 10px;
  color: #2c3e50;
  border-bottom: 3px solid #3498db;
  font-size: 2rem;
  line-height: 1.35;
}

.updated {
  margin: 0 0 32px;
  color: #687078;
  font-size: 0.9rem;
}

h2 {
  margin: 40px 0 10px;
  padding-left: 10px;
  color: #34495e;
  border-left: 4px solid #3498db;
  font-size: 1.45rem;
}

.faq-item {
  padding: 20px 0;
  border-bottom: 1px solid #e8ecef;
}

.faq-item:last-child {
  border-bottom: 0;
}

h3 {
  margin: 0 0 12px;
  color: #2c3e50;
  font-size: 1.08rem;
  line-height: 1.55;
}

p {
  margin: 0 0 12px;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 10px 0 14px;
  padding-left: 1.6rem;
}

li {
  margin-bottom: 6px;
}

a {
  color: #287db2;
  text-decoration: none;
}

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

.page-nav a {
  font-weight: 600;
}

.notice {
  padding: 12px 16px;
  background: #f2f7fb;
  border-left: 3px solid #3498db;
}

@media (max-width: 600px) {
  body {
    padding: 10px;
  }

  .container {
    padding: 22px 18px;
  }

  .page-nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  h1 {
    font-size: 1.65rem;
  }

  h2 {
    font-size: 1.3rem;
  }
}