* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #fff;
  color: #111;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  letter-spacing: 0.04em;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 120px 1fr;
  align-items: center;
  gap: 20px;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #111;
}

.brand-link img {
  width: 112px;
  height: auto;
}

.topbar nav {
  display: flex;
  justify-content: flex-end;
  gap: 28px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  letter-spacing: 0.22em;
}

main {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  min-height: 72vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 34px;
}

.hero-logo {
  width: min(820px, 96%);
  height: auto;
}

.tagline {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(14px, 2vw, 18px);
  letter-spacing: 0.28em;
}

.section {
  border-top: 1px solid #111;
  padding: 72px 0;
}

.section h1,
.product-info h2 {
  margin: 0 0 38px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  letter-spacing: 0.35em;
  font-weight: 400;
}

.product-list {
  min-height: 70vh;
}

.product-card {
  width: min(460px, 100%);
}

.product-card a {
  display: block;
}

.product-card figure {
  margin: 0 0 24px;
  background: #f7f7f7;
  overflow: hidden;
}

.product-card img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.product-card h2 {
  margin: 0 0 12px;
  font-size: clamp(26px, 4.8vw, 42px);
  font-weight: 400;
  letter-spacing: 0.08em;
}

.product-card p,
.price {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 18px;
  letter-spacing: 0.16em;
}

.contact dl {
  margin: 0;
  display: grid;
  gap: 22px;
}

.contact div {
  display: grid;
  grid-template-columns: 160px 1fr;
  border-bottom: 1px solid #ddd;
  padding-bottom: 14px;
}

.contact dt {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  letter-spacing: 0.2em;
}

.contact dd {
  margin: 0;
  min-height: 1em;
}

.legal p {
  margin: 0;
  color: #555;
}

/* Product detail page */
.product-page {
  padding: 52px 0 96px;
}

.back-link {
  display: inline-block;
  margin-bottom: 42px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  letter-spacing: 0.2em;
}

.product-detail {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 56px;
  align-items: start;
}

.product-visual {
  background: #f7f7f7;
}

.product-visual img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.product-info {
  position: sticky;
  top: 98px;
}

.product-info h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.35;
  font-weight: 400;
  letter-spacing: 0.08em;
}

.product-info .price {
  margin-bottom: 48px;
}

.sizes,
.size-chart {
  border-top: 1px solid #111;
  padding-top: 28px;
  margin-top: 32px;
}

.product-info h2 {
  margin-bottom: 18px;
  font-size: 12px;
}

.size-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.size-buttons button,
.cart-button {
  border: 1px solid #111;
  background: #fff;
  color: #111;
  font-family: Arial, Helvetica, sans-serif;
  letter-spacing: 0.18em;
}

.size-buttons button {
  padding: 13px 0;
  font-size: 13px;
}

.size-buttons button:hover,
.cart-button:hover {
  background: #111;
  color: #fff;
}

.size-chart table {
  width: 100%;
  border-collapse: collapse;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.size-chart th,
.size-chart td {
  border-bottom: 1px solid #ddd;
  padding: 12px 8px;
  text-align: left;
  vertical-align: top;
}

.size-chart th {
  font-weight: 400;
  color: #555;
}

.note {
  margin: 14px 0 0;
  color: #666;
  font-size: 12px;
  line-height: 1.7;
}

.cart-button {
  width: 100%;
  margin-top: 34px;
  padding: 18px 20px;
  font-size: 14px;
  cursor: pointer;
}

@media (max-width: 760px) {
  .topbar {
    width: min(100% - 28px, 1120px);
    grid-template-columns: 96px 1fr;
    gap: 12px;
    padding: 14px 0;
  }

  .brand-link img {
    width: 92px;
  }

  .topbar nav {
    gap: 14px;
    font-size: 10px;
    letter-spacing: 0.16em;
  }

  main {
    width: min(100% - 28px, 1120px);
  }

  .hero {
    min-height: 62vh;
  }

  .section {
    padding: 56px 0;
  }

  .product-card {
    width: 100%;
  }

  .product-detail {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .product-info {
    position: static;
  }

  .product-page {
    padding-top: 32px;
  }

  .contact div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .size-chart {
    overflow-x: auto;
  }

  .size-chart table {
    min-width: 560px;
  }
}