:root {
  --ink: #142028;
  --ink-soft: #3a4a54;
  --paper: #f5f7f8;
  --paper-deep: #e8eef1;
  --mist: #c5d4dc;
  --sea: #2f6f7a;
  --sea-deep: #1a4a52;
  --sea-glow: rgba(47, 111, 122, 0.18);
  --accent: #c4784a;
  --line: rgba(20, 32, 40, 0.12);
  --font-brand: "Syne", "Noto Sans JP", sans-serif;
  --font-body: "Noto Sans JP", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 720px;
  --wide: 1080px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.02em;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(47, 111, 122, 0.16), transparent 55%),
    radial-gradient(ellipse 60% 40% at 95% 5%, rgba(196, 120, 74, 0.1), transparent 50%),
    linear-gradient(165deg, #eef3f5 0%, var(--paper) 42%, #e6edf0 100%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(20, 32, 40, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 32, 40, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent);
  animation: grid-drift 28s linear infinite;
}

@keyframes grid-drift {
  from { transform: translateY(0); }
  to { transform: translateY(48px); }
}

a {
  color: var(--sea-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color 0.25s var(--ease);
}

a:hover {
  color: var(--sea);
}

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

.site {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.4rem 1.5rem;
  width: 100%;
}

.brand {
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  color: var(--sea-deep);
}

.nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15em;
  width: 100%;
  height: 1px;
  background: var(--sea);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}

.nav a:hover {
  color: var(--ink);
}

.nav a:hover::after,
.nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav a[aria-current="page"] {
  color: var(--ink);
}

main {
  flex: 1;
  width: 100%;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.site-footer {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 2rem 1.5rem 2.5rem;
  width: 100%;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: baseline;
  color: var(--ink-soft);
  font-size: 0.8125rem;
}

.site-footer a {
  color: var(--ink-soft);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--sea);
}

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

/* Hero / home */
.hero {
  padding: 4.5rem 0 3.5rem;
  max-width: var(--max);
}

.hero-brand {
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: clamp(3rem, 9vw, 5.25rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0 0 1.75rem;
  color: var(--ink);
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s var(--ease) 0.1s forwards;
}

.hero-lead {
  font-size: clamp(1.2rem, 2.8vw, 1.55rem);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0.04em;
  margin: 0 0 1.25rem;
  color: var(--sea-deep);
  opacity: 0;
  transform: translateY(14px);
  animation: rise 0.9s var(--ease) 0.28s forwards;
}

.hero-body {
  margin: 0;
  color: var(--ink-soft);
  max-width: 34em;
  opacity: 0;
  transform: translateY(14px);
  animation: rise 0.9s var(--ease) 0.42s forwards;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section {
  padding: 3rem 0 1rem;
  max-width: var(--max);
  opacity: 0;
  transform: translateY(16px);
  animation: rise 0.85s var(--ease) 0.55s forwards;
}

.section-label {
  font-family: var(--font-brand);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sea);
  margin: 0 0 1.25rem;
}

.product-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.product-list li {
  border-bottom: 1px solid var(--line);
}

.product-link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 0.15rem;
  text-decoration: none;
  color: var(--ink);
  transition: padding-left 0.35s var(--ease);
}

.product-link:hover {
  padding-left: 0.5rem;
  color: var(--sea-deep);
}

.product-name {
  font-family: var(--font-brand);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.product-meta {
  font-size: 0.8125rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.product-link:hover .product-meta {
  color: var(--sea);
}

/* Page interiors */
.page-hero {
  padding: 3rem 0 2rem;
  max-width: var(--max);
}

.page-hero h1 {
  font-family: var(--font-brand);
  font-size: clamp(2.1rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 1rem;
}

.page-hero .lede {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 36em;
}

.prose {
  max-width: var(--max);
  padding-bottom: 1rem;
}

.prose h2 {
  font-family: var(--font-brand);
  font-size: 1.25rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin: 2.25rem 0 0.75rem;
}

.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

.prose p,
.prose ul,
.prose ol {
  color: var(--ink-soft);
  margin: 0 0 1rem;
}

.prose ul,
.prose ol {
  padding-left: 1.35rem;
}

.prose li + li {
  margin-top: 0.35rem;
}

.prose strong {
  color: var(--ink);
  font-weight: 600;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 2px;
  transition:
    background 0.3s var(--ease),
    color 0.3s var(--ease),
    border-color 0.3s var(--ease),
    transform 0.3s var(--ease);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
}

.btn-primary:hover {
  background: var(--sea-deep);
  border-color: var(--sea-deep);
  color: #fff;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  border-color: var(--sea);
  color: var(--sea-deep);
  background: rgba(255, 255, 255, 0.45);
}

.contact-block {
  margin-top: 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  max-width: var(--max);
}

.contact-label {
  margin: 0 0 0.75rem;
  color: var(--ink-soft);
  font-size: 0.875rem;
}

.contact-email {
  font-family: var(--font-brand);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
}

.contact-email:hover {
  color: var(--sea);
}

.contact-note {
  margin: 1.25rem 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  max-width: 32em;
}

.eyebrow {
  margin-bottom: 0.75rem;
}

.legal-meta {
  font-size: 0.875rem;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
}

.subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 0 0 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  max-width: var(--max);
  font-size: 0.875rem;
}

.subnav a {
  text-decoration: none;
  color: var(--ink-soft);
}

.subnav a:hover,
.subnav a[aria-current="page"] {
  color: var(--sea-deep);
}

@media (max-width: 560px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }

  .hero {
    padding-top: 2.75rem;
  }

  .product-link {
    flex-direction: column;
    gap: 0.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  body::before {
    animation: none;
  }

  .hero-brand,
  .hero-lead,
  .hero-body,
  .section {
    opacity: 1;
    transform: none;
    animation: none;
  }
}