:root {
  color-scheme: light dark;
  --bg: #f4f7fc; --bg2: #dde4f1;
  --ink: #12182a; --muted: #55607a; --faint: #6b7488;
  --card: rgba(255, 255, 255, .82); --line: rgba(18, 24, 42, .10);
  --accent: #4a8cff; --accent-ink: #2a5fc0; --accent-soft: rgba(74, 140, 255, .12);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1120; --bg2: #070910;
    --ink: #eef1f8; --muted: #a4aec4; --faint: #8b95a9;
    --card: rgba(255, 255, 255, .055); --line: rgba(255, 255, 255, .10);
    --accent: #6fa2ff; --accent-ink: #a8c6ff; --accent-soft: rgba(120, 170, 255, .16);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh;
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
        "Noto Sans JP", "PingFang TC", sans-serif;
  color: var(--ink);
  background: linear-gradient(var(--bg), var(--bg2)) fixed;
}
a { color: var(--accent-ink); }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 22px 64px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 26px 0 40px; }
.brand { font-size: 16px; font-weight: 600; letter-spacing: -.2px; text-decoration: none; color: var(--ink); }
nav { display: flex; gap: 18px; }
nav a { font-size: 14px; text-decoration: none; color: var(--muted); }
nav a:hover { color: var(--accent-ink); }
.eyebrow { margin: 0 0 10px; font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); }
h1 { margin: 0 0 16px; font-size: clamp(32px, 6.2vw, 44px); line-height: 1.1; letter-spacing: -1px; }
h2 { margin: 44px 0 12px; font-size: 19px; letter-spacing: -.2px; }
h3 { margin: 0 0 8px; font-size: 16px; }
.lede { margin: 0 0 24px; font-size: 19px; line-height: 1.55; color: var(--muted); }
p { margin: 0 0 14px; }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin: 28px 0 14px; }
.button { display: inline-block; padding: 13px 24px; border-radius: 999px; background: var(--accent); color: #fff; font-size: 15px; font-weight: 600; text-decoration: none; }
.button--soon { background: var(--accent-soft); color: var(--accent-ink); }
.fine { margin: 0; font-size: 14px; color: var(--faint); }
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(212px, 1fr)); margin: 44px 0 0; }
.card { padding: 20px; border: 1px solid var(--line); border-radius: 20px; background: var(--card); }
.card p { margin: 0; font-size: 15px; color: var(--muted); }
.note { margin-top: 44px; padding: 22px; border: 1px solid var(--line); border-radius: 20px; }
.note p { margin: 0; font-size: 15px; color: var(--muted); }
details { border-top: 1px solid var(--line); padding: 16px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 600; font-size: 16px; }
details p { margin: 10px 0 0; color: var(--muted); }
.facts { margin: 0 0 8px; display: grid; gap: 16px; }
.facts dt { font-size: 13px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; color: var(--faint); }
.facts dd { margin: 2px 0 0; }
.todo { color: var(--faint); }
code { font: 14px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; }
.notice { margin: 0 0 28px; padding: 14px 16px; border-radius: 14px; background: var(--accent-soft); font-size: 14px; color: var(--accent-ink); }
footer { margin-top: 64px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 13px; color: var(--faint); }
footer p { margin: 0 0 8px; }
footer a { color: var(--faint); }