html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: #ffffff;
  color: #222222;
  font-family: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.8;
  padding-top: 80px;
}

section {
  padding: 120px 0;
}

.bg-alt {
  background-color: #f9f9f9;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid #eee;
  display: flex;
  align-items: center;
}
.site-header .header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}
.site-header .logo {
  font-size: 1.1rem;
  letter-spacing: 0.15em;
  font-weight: bold;
  color: #111111;
}
.site-header .main-nav ul {
  display: flex;
  list-style: none;
  gap: 30px;
  margin: 0;
  padding: 0;
}
.site-header .main-nav ul a {
  text-decoration: none;
  color: #222222;
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.3s;
}
.site-header .main-nav ul a:hover {
  color: #FF6600;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 4rem;
  font-weight: normal;
  letter-spacing: 0.1em;
  text-align: center;
  color: #111111;
}

.section-sub {
  display: block;
  font-size: 0.8rem;
  color: #FF6600;
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  margin-bottom: 0.8rem;
  letter-spacing: 0.4em;
  font-weight: bold;
}

.hero {
  height: calc(100dvh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.5));
}
.hero .hero-content {
  text-align: center;
}
.hero .hero-title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  letter-spacing: 0.15em;
  margin-bottom: 15px;
  font-weight: normal;
  color: #111111;
}
.hero .hero-subtitle {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  font-size: clamp(0.8rem, 1.5vw, 1.1rem);
  letter-spacing: 0.4em;
  color: #FF6600;
  font-weight: bold;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.grid-2.reverse .text-box {
  order: -1;
}
@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .grid-2.reverse .text-box {
    order: 0;
  }
}

.img-box {
  position: relative;
  z-index: 1;
}
.img-box img {
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 1;
}
.img-box::after {
  content: "";
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 80px;
  height: 80px;
  border-bottom: 2px solid #FF6600;
  border-right: 2px solid #FF6600;
  z-index: 2;
  pointer-events: none;
}
.img-box.reverse::after {
  right: auto;
  left: -20px;
  border-right: none;
  border-left: 2px solid #FF6600;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background: #ffffff;
  border: 1px solid #eee;
  transition: transform 0.4s ease;
}
.feature-card:hover {
  transform: translateY(-8px);
}
.feature-card .text-box {
  padding: 30px;
}
.feature-card .text-box h3 {
  font-size: 1.2rem;
  margin: 0 0 15px;
  font-weight: normal;
}
.feature-card .text-box p {
  font-size: 0.9rem;
  color: #666666;
  margin: 0;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 60px;
}
@media (max-width: 900px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .products-grid {
    grid-template-columns: 1fr;
  }
}

.product-item {
  text-align: center;
}
.product-item .img-box {
  margin-bottom: 20px;
}
.product-item .img-box::after {
  display: none;
}
.product-item h3 {
  font-size: 1.1rem;
  font-weight: normal;
  margin-bottom: 10px;
  color: #111111;
}
.product-item .price {
  color: #FF6600;
  font-weight: bold;
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
}

.btn {
  display: inline-block;
  padding: 16px 50px;
  background-color: #111111;
  color: #ffffff;
  text-decoration: none;
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  transition: 0.3s;
}
.btn:hover {
  background-color: #FF6600;
  box-shadow: 0 10px 20px rgba(255, 102, 0, 0.2);
}

footer {
  background: #111111;
  padding: 80px 0;
  text-align: center;
  color: #ffffff;
}
footer .back-to-top {
  display: inline-block;
  color: #ffffff;
  text-decoration: none;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  margin-bottom: 40px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 8px 20px;
  transition: 0.3s;
}
footer .back-to-top:hover {
  border-color: #FF6600;
  color: #FF6600;
}
footer .logo {
  font-size: 1.2rem;
  letter-spacing: 0.2em;
  margin-bottom: 20px;
}
footer p {
  font-size: 0.75rem;
  color: #666;
}