body {
  margin: 0;
  font-family: sans-serif;
  background: #f5f5f5;
}

/* ヘッダー */
.hero {
  background: linear-gradient(to right, #111, #333);
  color: white;
  text-align: center;
  padding: 100px 20px;
}

.hero h1 {
  font-size: 40px;
  margin: 10px 0;
}

.sub {
  letter-spacing: 2px;
  font-size: 12px;
  opacity: 0.7;
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 30px;
  background: black;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

/* セクション */
section {
  background: white;
  margin: 20px;
  padding: 30px;
  border-radius: 10px;
}

/* 実績カード */
.card {
  margin-top: 20px;
}

.card img {
  width: 100%;
  border-radius: 10px;
}

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

input, textarea {
  margin: 10px 0;
  padding: 12px;
  font-size: 16px;
}

button {
  padding: 15px;
  background: black;
  color: white;
  border: none;
  font-size: 16px;
  cursor: pointer;
}