:root {
  --ink: #17202a;
  --paper: #f6f5f1;
  --blue: #1e3a75;
  --red: #d9472d;
  --orange: #ef9c34;
  --line: #d9d8d3;
  --muted: #697075;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans JP", sans-serif;
}
a {
  color: inherit;
  text-decoration: none;
}
.shell {
  width: min(1280px, calc(100% - 48px));
  margin: auto;
}
.nav {
  height: 82px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font:
    800 1.18rem/1 "Plus Jakarta Sans",
    sans-serif;
  letter-spacing: -0.07em;
}
.mark {
  display: grid;
  grid-template-columns: 10px 10px;
  gap: 3px;
  width: 23px;
  transform: rotate(-3deg);
}
.mark i {
  display: block;
  aspect-ratio: 1;
}
.mark i:nth-child(1) {
  background: var(--blue);
}
.mark i:nth-child(2) {
  background: var(--red);
}
.mark i:nth-child(3) {
  background: var(--orange);
}
.mark i:nth-child(4) {
  background: var(--ink);
}
.back,
.product-hero > div > span,
.section-head,
.product-meta span,
.options-grid article > span,
.cta > div > span,
footer {
  font:
    500 0.7rem "DM Mono",
    monospace;
  letter-spacing: 0.08em;
}
.back:hover {
  color: var(--red);
}
.product-hero {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  min-height: 560px;
  background: #e8e6de;
}
.hero-copy {
  padding: 62px 58px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.hero-copy > span,
.product-meta span,
.options-grid article > span {
  color: var(--red);
}
h1 {
  max-width: 520px;
  margin: 22px 0 30px;
  font:
    700 clamp(3rem, 6vw, 6.1rem)/0.9 "Plus Jakarta Sans",
    sans-serif;
  letter-spacing: -0.085em;
}
.hero-copy p {
  max-width: 390px;
  margin: 0;
  color: #39434b;
  font-size: 0.95rem;
  line-height: 2;
}
.product-hero figure {
  min-height: 520px;
  margin: 0;
  background: #d5d8d7;
  overflow: hidden;
}
.product-hero img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.product-body {
  padding: 105px 0;
}
.product-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--line);
}
.product-meta > div {
  min-height: 112px;
  padding: 19px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.product-meta span {
  display: block;
  margin-bottom: 17px;
}
.product-meta b {
  font:
    600 1rem/1.35 "Noto Sans JP",
    sans-serif;
}
.spec-block,
.options-block {
  margin-top: 94px;
}
.section-head {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--ink);
  padding: 17px 0;
}
.spec-block dl {
  margin: 0;
  border-top: 1px solid var(--line);
}
.spec-block dl > div {
  display: grid;
  grid-template-columns: 0.34fr 1fr;
  gap: 30px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
dt {
  font:
    500 0.73rem "DM Mono",
    monospace;
  letter-spacing: 0.06em;
  color: var(--red);
}
dd {
  margin: 0;
  max-width: 680px;
  font-size: 0.92rem;
  line-height: 1.9;
}
.options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.options-grid article {
  min-height: 210px;
  padding: 22px 23px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.options-grid h3 {
  margin: 53px 0 12px;
  font:
    700 1.3rem/1 "Plus Jakarta Sans",
    sans-serif;
  letter-spacing: -0.06em;
}
.options-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.8;
}
.cta {
  padding: 64px 0 36px;
  background: var(--red);
  color: #fff;
}
.cta > div > span {
  color: #ffe1ab;
}
.cta h2 {
  margin: 23px 0 17px;
  font:
    700 clamp(2.2rem, 5vw, 5rem)/0.96 "Plus Jakarta Sans",
    sans-serif;
  letter-spacing: -0.085em;
}
.cta p {
  max-width: 590px;
  margin: 0 0 34px;
  font-size: 0.92rem;
  line-height: 1.9;
}
.cta a {
  display: inline-block;
  padding: 15px 20px;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
  font-size: 0.8rem;
}
footer {
  padding: 22px 0;
  background: var(--ink);
  color: #bbc1c7;
}
footer .shell {
  display: flex;
  justify-content: space-between;
}
@media (max-width: 720px) {
  .shell {
    width: min(100% - 32px, 1280px);
  }
  .nav {
    height: 70px;
  }
  .back {
    font-size: 0.62rem;
  }
  .product-hero {
    grid-template-columns: 1fr;
  }
  .hero-copy {
    min-height: 350px;
    padding: 48px 28px;
  }
  .hero-copy p {
    font-size: 0.9rem;
  }
  .product-hero figure {
    min-height: 380px;
  }
  .product-body {
    padding: 65px 0;
  }
  .product-meta {
    grid-template-columns: 1fr;
  }
  .product-meta > div {
    min-height: 88px;
    padding: 16px;
  }
  .spec-block,
  .options-block {
    margin-top: 62px;
  }
  .spec-block dl > div {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 19px 0;
  }
  .options-grid {
    grid-template-columns: 1fr;
  }
  .options-grid article {
    min-height: 165px;
    padding: 18px;
  }
  .options-grid h3 {
    margin-top: 34px;
  }
  .cta {
    padding-top: 48px;
  }
  .cta p {
    font-size: 0.86rem;
  }
  footer .shell {
    flex-direction: column;
    gap: 8px;
  }
}