.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: #fff;
  z-index: 1200;
  transition: box-shadow 0.3s;
}

.header.is-scrolled {
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.header-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo img {
  height: 50px;
}

.header-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
}

.header-home {
  text-decoration: none;
  color: inherit;
}

.site-name {
  font-size: 22px;
  font-weight: bold;
}

.site-tel {
  font-size: 15px;
  color: #555;
}

.site-tel a {
  color: inherit;
  text-decoration: none;
}

/* ヘッダー内ナビ（PC） */
.header-nav ul {
  display: flex;
  gap: 30px;
  list-style: none;
}

.header-nav a {
  text-decoration: none;
  color: #333;
  font-size: 14px;
  position: relative;
}

.header-nav a:hover {
  opacity: 0.7;
}

.header-nav {
   display: block; 
  }
.hamburger {
   display: none; 
  }
.nav {
   display: none; 
  }

/* ヘッダーメニュー 下線アニメーション */
.header-nav a {
  position: relative;
  padding-bottom: 4px;
}

.header-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.header-nav a:hover::after {
  transform: scaleX(1);
}