/* 全体設定 */
body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #222;
}

/* ヘッダー */
header {
  background-color: #222;
  color: white;
  padding: 1rem;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

nav ul li {
  margin: 0;
}

nav ul li a {
  color: white;
  text-decoration: none;
}

nav ul li a:hover {
  text-decoration: underline;
}

/* メイン */
main {
  padding: 1rem;
}

section {
  margin-bottom: 2rem;
}

h2 {
  border-left: 5px solid #222;
  padding-left: 0.5rem;
  margin-top: 2rem;
}

article {
  background: white;
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  margin-top: 1rem;
}

/* フォーム */
form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

input, textarea, button {
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1rem;
}

button {
  background-color: #222;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #444;
}

/* フッター */
footer {
  background-color: #222;
  color: white;
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  position: relative;
  bottom: 0;
  width: 100%;
}

/* レスポンシブ */
@media (max-width: 600px) {
  nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }

  h1 {
    font-size: 1.2rem;
  }
}