:root {
  --bg: oklch(0.145 0 0);
  --fg: oklch(0.985 0 0);
  --muted: oklch(0.708 0 0);
  --border: oklch(1 0 0 / 12%);
  --card: oklch(0.205 0 0);
  --accent: oklch(0.62 0.16 30);
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased; min-height: 100vh;
  display: flex; flex-direction: column;
}
a { color: inherit; }
code, .mono { font-family: ui-monospace, "SF Mono", monospace; }
header.site {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 24px;
}
.brand { display: flex; align-items: baseline; gap: 8px; font-weight: 700; font-size: 18px; text-decoration: none; }
.brand .en { font-size: 11px; letter-spacing: .18em; color: var(--muted); font-weight: 400; }
.brand .dot { color: var(--accent); }
.btn {
  display: inline-block; padding: 9px 18px; border-radius: 8px; text-decoration: none;
  font-size: 14px; font-weight: 600; border: 1px solid var(--border);
}
.btn.primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
main.hero {
  max-width: 760px; margin: 0 auto; padding: 72px 24px; text-align: center;
  display: flex; flex-direction: column; gap: 40px; flex: 1;
}
h1 { font-size: 34px; margin: 0; line-height: 1.4; }
.lead { color: var(--muted); line-height: 1.9; margin: 0; }
.cta { display: flex; gap: 12px; justify-content: center; }
.snippet {
  margin: 8px auto 0; width: fit-content; padding: 8px 14px; border: 1px solid var(--border);
  border-radius: 8px; color: var(--muted); font-size: 13px; background: var(--card);
}
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; text-align: center; }
@media (max-width: 700px) { .features { grid-template-columns: 1fr; } }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 20px; background: var(--card); }
.card h3 { margin: 0 0 8px; font-size: 15px; }
.card p { margin: 0; font-size: 13px; color: var(--muted); line-height: 1.8; }
footer.site {
  display: flex; gap: 24px; justify-content: center; padding: 16px 24px;
  border-top: 1px solid var(--border); font-size: 12px; color: var(--muted);
}
footer.site a { text-decoration: none; }
footer.site a:hover { color: var(--fg); }
/* legal */
article.legal { max-width: 680px; margin: 0 auto; padding: 48px 24px; flex: 1; }
article.legal h1 { font-size: 24px; }
article.legal h2 { font-size: 16px; margin-top: 28px; }
article.legal p { color: var(--muted); line-height: 1.9; font-size: 14px; }
article.legal b { color: var(--fg); }