body {
  font-family: "Noto Sans JP", sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
  background-color: #f8f8f8;
}

.container {
  width: 90%;
  max-width: 1000px;
  margin: 0 auto;
}

/* ヘッダー */
header {
  background-color: #1a3c6e;
  color: white;
  padding: 15px 0;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.4rem;
  margin: 0;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

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

/* メインビジュアル */
.hero {
  background: url('construction.jpg') center/cover no-repeat;
  height: 400px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  text-align: center;
  background-color: #1a3c6e;
}

.hero-content h2 {
  font-size: 2rem;
  margin-bottom: 10px;
}

.hero-content p {
  font-size: 1.1rem;
}

/* セクション */
section {
  padding: 60px 0;
  background-color: white;
  margin-bottom: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

h3 {
  text-align: center;
  margin-bottom: 20px;
  color: #1a3c6e;
}

.business-list {
  list-style: disc;
  padding-left: 40px;
}

.btn {
  display: inline-block;
  margin-top: 15px;
  padding: 10px 20px;
  background-color: #1a3c6e;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

.btn:hover {
  background-color: #163258;
}

/* フッター */
footer {
  background-color: #1a3c6e;
  color: white;
  text-align: center;
  padding: 15px 0;
  font-size: 0.9rem;
}
.about-flex {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 30px;
  margin-top: 20px;
}

.about-text {
  flex: 1 1 55%;
}

.about-photo {
  flex: 1 1 40%;
  text-align: center;
}

.about-photo img {
  width: 100%;
  max-width: 400px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

/* 主な事業内容（写真レイアウト） */
.business-flex {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 40px;
  margin-top: 30px;
}

.business-item {
  flex: 1 1 45%;
  background: white;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
  text-align: center;
}

.business-item img {
  width: 100%;
  max-width: 350px;
  border-radius: 8px;
  margin-bottom: 15px;
}