:root {
  color-scheme: light;
  --background: #ffffff;
  --surface: #f5f8f8;
  --surface-strong: #e9f0f0;
  --text: #172224;
  --muted: #5a696b;
  --line: #dbe4e4;
  --accent: #0c5f62;
  --accent-dark: #08494c;
  --accent-soft: #e5f3f2;
  --max-width: 70rem;
  --content-width: 45rem;
  --radius: 1.25rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  font-synthesis: none;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 0.08em;
}

a:hover {
  color: var(--accent-dark);
}

a:focus-visible {
  outline: 0.2rem solid var(--accent);
  outline-offset: 0.25rem;
  border-radius: 0.2rem;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.65rem 0.9rem;
  border-radius: 0.5rem;
  background: var(--text);
  color: #ffffff;
  transform: translateY(-160%);
}

.skip-link:focus {
  color: #ffffff;
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  min-height: 4.75rem;
  padding-block: 0.75rem;
}

.brand {
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.4rem;
}

.site-nav a {
  padding: 0.35rem 0.5rem;
  border-radius: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

main {
  min-height: calc(100vh - 13rem);
}

.hero {
  padding-block: clamp(4.5rem, 13vw, 9rem);
}

.hero-inner,
.page-intro,
.prose {
  max-width: var(--content-width);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.35;
  letter-spacing: -0.025em;
}

h1 {
  max-width: 12em;
  margin-bottom: 1.5rem;
  font-size: clamp(2.35rem, 8vw, 4.75rem);
  font-weight: 760;
}

h2 {
  margin-bottom: 1.25rem;
  font-size: clamp(1.7rem, 5vw, 2.5rem);
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.2rem;
}

p {
  margin-top: 0;
}

.lead {
  max-width: 38rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  line-height: 1.95;
}

.section {
  padding-block: clamp(3.5rem, 9vw, 6.5rem);
  border-top: 1px solid var(--line);
}

.section-soft {
  background: var(--surface);
}

.section-heading {
  max-width: 38rem;
  margin-bottom: 2rem;
}

.product-card {
  display: grid;
  gap: 2rem;
  padding: clamp(1.5rem, 5vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--background);
  box-shadow: 0 1.5rem 4rem rgba(20, 46, 48, 0.06);
}

.product-name {
  margin: 0;
  color: var(--accent);
  font-size: clamp(2rem, 7vw, 3.8rem);
  font-weight: 760;
  letter-spacing: -0.04em;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 700;
}

.text-link::after {
  content: "→";
}

.contact-block {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1.25rem 2rem;
}

.email-link {
  font-size: clamp(1.15rem, 4vw, 1.55rem);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.page-header {
  padding-block: clamp(3.5rem, 10vw, 6.5rem);
}

.page-header h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.4rem, 8vw, 4.25rem);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.75rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--background);
  font-weight: 700;
  text-align: center;
}

.status-note {
  display: inline-block;
  margin-top: 2.25rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.9rem;
  font-weight: 700;
}

.prose {
  padding-bottom: clamp(4rem, 10vw, 7rem);
}

.prose section + section {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--line);
}

.prose h2 {
  margin-bottom: 0.8rem;
  font-size: 1.35rem;
}

.prose p,
.prose li {
  color: var(--muted);
}

.prose ul {
  padding-left: 1.3rem;
}

.updated {
  margin-top: 3.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  min-height: 7rem;
  padding-block: 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links a {
  color: inherit;
}

@media (min-width: 48rem) {
  .container {
    width: min(calc(100% - 4rem), var(--max-width));
  }

  .site-nav {
    gap: 0.4rem 0.85rem;
  }

  .product-card {
    grid-template-columns: minmax(12rem, 0.65fr) minmax(18rem, 1fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}