/* 基本スタイル */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 
               "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.7;
  margin: 20px auto;
  max-width: 720px;
  padding: 0 16px;
  color: #111;
  background: #fff;
}

h1 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.1rem;
  color: #444;
  margin-bottom: 1.5rem;
}

p {
  font-size: 1rem;
  margin-bottom: 1rem;
}

ul {
  padding-left: 1rem;
  list-style: none; /* 黒点消す */
}

li {
  margin-bottom: 0.8rem;
}

a {
  color: #000;
  text-decoration: underline;
}

a:hover {
  opacity: 0.6;
}

hr {
  margin: 2rem 0;
  border: none;
  border-top: 1px solid #ddd;
}

section {
  margin-top: 2rem;
}

strong {
  font-weight: 600;
}

/* レスポンシブ調整 */
@media (max-width: 400px) {
  h1 { font-size: 1.4rem; }
  h2 { font-size: 1rem; }
  p { font-size: 0.95rem; }
}