@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&display=swap');

body {
  font-family: 'Noto Sans JP', sans-serif;
  letter-spacing: 0.05em;
  margin: 0;
  padding: 0;
  background: #fff;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background: #fff;
  border-bottom: 1px solid #f1f1f1;
  z-index: 1000;
}

.header-inner {
  width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-size: 20px;
  font-weight: 500;
}

.contact {
  position: absolute;
  right: 0;
  top: 0;
  width: 300px;
  height: 100px;
  background: #555;
  color: #fff;
  font-size: 26px;
  font-weight: 500;
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
}

.contact:hover {
  background: #444;
}

.main-visual {
  margin-top: 100px;
  width: 100%;
  height: 600px;
  position: relative;
  overflow: hidden;
}

.main-visual img {
  width: 100%;
  height: 600px;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.main-visual img.active {
  opacity: 1;
}

.main-visual h1 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #000;
  font-size: 40px;
  font-weight: 700;
}

.section {
  width: 1000px;
  margin: 100px auto;
}

.section h2 {
  text-align: center;
  font-size: 20px;
  font-weight: 400;
}

.section h3 {
  text-align: center;
  font-size: 32px;
  font-weight: 400;
  margin-top: 10px;
}

.about-text {
  margin-top: 50px;
  font-size: 16px;
  font-weight: 400;
  line-height: 2;
  text-align: left;
}

.product-section {
  background: #f3f3f3;
  padding: 100px 0;
}

.products {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 30px 0;
  margin-top: 50px;
}

.product-item {
  width: 300px;
}

.product-item img {
  width: 300px;
  height: 220px;
  object-fit: cover;
}

.product-item h4 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.7;
  margin: 10px 0;
  text-align: left;
}

.product-item p {
  font-size: 15px;
  font-weight: 400;
  line-height: 2;
  text-align: left;
}

.product-item a {
  display: block;
  margin-top: 40px;
  width: 100%;
  border: 1px solid #000;
  padding: 10px;
  text-align: center;
  text-decoration: none;
  color: #000;
  transition: all 0.3s;
}

.product-item a:hover {
  background: #000;
  color: #fff;
}

footer {
  background: #000;
  color: #fff;
  height: 60px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: 0 20px;
  font-size: 12px;
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 80px;
  height: 80px;
  background: #fff;
  border: 1px solid #000;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  z-index: 999;
}