:root {
  --ink: #eaf6f5;
  --muted: #9db6ba;
  --night: #061721;
  --night-raised: #0b2631;
  --line: #244551;
  --signal: #65e4c4;
  --signal-soft: #b9f5e7;
  --paper: #f3f5f0;
  --paper-ink: #17282d;
  --paper-muted: #597077;
  --paper-line: #cbd8d5;
  --max-width: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--night);
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

a:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 8px 14px;
  background: var(--signal);
  color: var(--night);
  font-weight: 700;
  transform: translateY(-180%);
}

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

.site-header,
.site-footer,
.hero,
.verification-section,
.link-section,
.document-main {
  width: min(calc(100% - 40px), var(--max-width));
  margin-inline: auto;
}

.site-header {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: flex;
  flex-direction: column;
  gap: 1px;
  text-decoration: none;
  line-height: 1.35;
}

.wordmark-ja { font-size: 0.83rem; font-weight: 700; letter-spacing: 0.05em; }
.wordmark-en { color: var(--muted); font-size: 0.65rem; letter-spacing: 0.12em; text-transform: uppercase; }

.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav a,
.site-footer a {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}
.site-nav a:hover,
.site-footer a:hover { color: var(--signal-soft); }

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(330px, 0.9fr);
  align-items: center;
  gap: 5vw;
  padding-block: 72px 90px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--signal);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(2.6rem, 4.2vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.065em;
  line-height: 1.05;
}

.title-line { display: block; white-space: nowrap; }
.hero h1 .title-cross { color: var(--signal); font-weight: 400; }
.hero-en { margin: 22px 0 0; color: var(--muted); font-size: clamp(0.9rem, 1.8vw, 1.12rem); letter-spacing: 0.2em; }
.hero-description { max-width: 520px; margin: 44px 0 0; color: #c3d5d7; font-size: 1.03rem; }

.store-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button {
  min-width: 152px;
  padding: 12px 18px;
  border: 1px solid var(--signal);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-align: center;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--signal); color: var(--night); }
.button-secondary { color: var(--signal-soft); }
.button-secondary:hover { background: var(--night-raised); }

.signal-scene {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border: 1px solid var(--line);
  background: radial-gradient(circle at 50% 45%, #114150 0 2%, #0a2631 34%, #061721 70%);
}
.signal-scene::before,
.signal-scene::after {
  content: "";
  position: absolute;
  background: var(--line);
}
.signal-scene::before { width: 1px; height: 100%; left: 50%; }
.signal-scene::after { width: 100%; height: 1px; top: 50%; }
.orbit { position: absolute; inset: 18%; border: 1px solid #2d6570; border-radius: 50%; }
.orbit-two { inset: 32%; border-style: dashed; }
.signal-core {
  position: absolute;
  z-index: 2;
  inset: 40%;
  display: grid;
  place-items: center;
  border: 1px solid var(--signal);
  background: var(--night);
  color: var(--signal);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: clamp(0.7rem, 2vw, 1rem);
  letter-spacing: 0.18em;
  transform: rotate(45deg);
}
.signal-core span { transform: rotate(-45deg); }
.city-grid {
  position: absolute;
  inset: 62% 8% 0;
  border-top: 1px solid var(--line);
  background: repeating-linear-gradient(90deg, transparent 0 28px, #12323d 28px 29px), repeating-linear-gradient(0deg, transparent 0 25px, #12323d 25px 26px);
  transform: perspective(180px) rotateX(53deg);
  transform-origin: top;
}

.verification-section,
.link-section { padding-block: 88px; border-top: 1px solid var(--line); }
.verification-section { display: grid; grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.5fr); gap: 8vw; }
.section-heading h2,
.document-header h1 { margin: 0; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.2; letter-spacing: -0.04em; }
.fact-list,
.company-list { margin: 0; }
.fact-list > div { display: grid; grid-template-columns: 180px 1fr; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.fact-list > div:first-child { border-top: 1px solid var(--line); }
.fact-list dt { color: var(--muted); font-size: 0.78rem; font-weight: 700; }
.fact-list dd { margin: 0; font-weight: 650; }
code { color: var(--signal-soft); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 0.9em; overflow-wrap: anywhere; }

.link-section { display: grid; grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.5fr); gap: 8vw; }
.link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.link-card { min-height: 128px; display: flex; flex-direction: column; justify-content: space-between; gap: 16px; padding: 22px; border: 1px solid var(--line); background: var(--night-raised); text-decoration: none; transition: border-color 160ms ease, transform 160ms ease; }
.link-card:hover { border-color: var(--signal); transform: translateY(-3px); }
.link-card:last-child { grid-column: 1 / -1; }
.link-label { font-weight: 800; }
.link-detail { color: var(--signal-soft); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 0.82rem; overflow-wrap: anywhere; }
.arrow { align-self: flex-end; color: var(--signal); font-size: 1.25rem; }

.site-footer { padding-block: 34px 48px; border-top: 1px solid var(--line); color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 12px 24px; }
.site-footer p { margin: 22px 0 0; font-size: 0.7rem; letter-spacing: 0.04em; }

.subpage { background: var(--paper); color: var(--paper-ink); }
.subpage .site-header { border-color: var(--paper-line); }
.subpage .wordmark-en,
.subpage .site-nav a,
.subpage .site-footer,
.subpage .site-footer a { color: var(--paper-muted); }
.subpage .site-nav a:hover,
.subpage .site-footer a:hover { color: #0c6b5b; }
.subpage .eyebrow { color: #0b735f; }
.subpage .site-footer { border-color: var(--paper-line); }
.document-main { padding-block: 76px 110px; }
.document-header { max-width: 820px; margin-bottom: 52px; }
.company-card { max-width: 820px; border-top: 2px solid var(--paper-ink); }
.company-list > div { display: grid; grid-template-columns: 150px 1fr; gap: 32px; padding: 26px 0; border-bottom: 1px solid var(--paper-line); }
.company-list dt { color: var(--paper-muted); font-size: 0.8rem; font-weight: 700; }
.company-list dd { margin: 0; font-weight: 600; }

.privacy-main { width: min(calc(100% - 40px), 920px); }
.privacy-header { display: flex; justify-content: space-between; align-items: end; gap: 24px; }
.privacy-date { margin: 0; color: var(--paper-muted); font-size: 0.82rem; }
.archive-note { margin: -26px 0 32px; padding: 14px 18px; border: 1px solid var(--paper-line); color: var(--paper-muted); font-size: 0.78rem; }
.privacy-source {
  margin: 0;
  padding: 42px;
  border-top: 2px solid var(--paper-ink);
  background: #fbfcf8;
  color: var(--paper-ink);
  font: inherit;
  font-size: 0.94rem;
  line-height: 2;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.error-main { min-height: calc(100vh - 190px); display: grid; place-items: center; padding: 64px 20px; }
.error-card { width: min(100%, 620px); border: 1px solid var(--line); padding: clamp(28px, 6vw, 64px); }
.error-code { margin: 0; color: var(--signal); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 0.8rem; letter-spacing: 0.2em; }
.error-card h1 { margin: 10px 0 12px; font-size: clamp(2rem, 7vw, 4.5rem); line-height: 1.1; }
.error-card p { color: var(--muted); }

@media (max-width: 760px) {
  .site-header { min-height: 76px; align-items: flex-start; padding-block: 16px; }
  .wordmark-ja { font-size: 0.72rem; }
  .wordmark-en { font-size: 0.56rem; }
  .site-nav { gap: 14px; }
  .site-nav a { font-size: 0.72rem; }
  .hero { min-height: 0; grid-template-columns: 1fr; gap: 56px; padding-block: 64px 72px; }
  .hero h1 { font-size: clamp(1.8rem, 9vw, 3.5rem); }
  .signal-scene { width: min(100%, 430px); justify-self: center; }
  .verification-section,
  .link-section { grid-template-columns: 1fr; gap: 40px; padding-block: 64px; }
  .fact-list > div { grid-template-columns: 1fr; gap: 4px; }
  .link-grid { grid-template-columns: 1fr; }
  .link-card:last-child { grid-column: auto; }
  .document-main { padding-block: 56px 80px; }
  .company-list > div { grid-template-columns: 1fr; gap: 5px; }
  .privacy-header { display: block; }
  .privacy-date { margin-top: 14px; }
  .archive-note { margin-top: -18px; }
  .privacy-source { margin-inline: -8px; padding: 24px 18px; font-size: 0.88rem; line-height: 1.9; }
}

@media (max-width: 480px) {
  .site-header,
  .site-footer,
  .hero,
  .verification-section,
  .link-section,
  .document-main { width: min(calc(100% - 28px), var(--max-width)); }
  .site-nav a:first-child { display: none; }
  .store-actions { display: grid; }
  .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}