:root {
  --brand: #0F6E66;
  --brand-dark: #0B524C;
  --brand-light: #D7F5F0;
  --text: #16181D;
  --muted: #5F6670;
  --bg: #F1F2F4;
  --card: #FFFFFF;
  --border: #DADDE2;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", "Noto Sans JP", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--brand); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.top { background: var(--brand); color: #fff; }
header.top .wrap { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; }
.logo { font-weight: 800; font-size: 22px; color: #fff; text-decoration: none; }
.langs a { color: var(--brand-light); text-decoration: none; margin-left: 14px; font-weight: 600; }
.langs a[aria-current="true"] { color: #fff; text-decoration: underline; }
.hero { background: var(--brand); color: #fff; padding: 40px 0 56px; }
.hero h1 { font-size: 36px; line-height: 1.2; margin: 0 0 12px; }
.hero p { font-size: 18px; color: var(--brand-light); margin: 0 0 24px; }
.btn {
  display: inline-block; background: #fff; color: var(--brand-dark); font-weight: 700;
  padding: 14px 22px; border-radius: 12px; text-decoration: none;
}
.btn.soon { opacity: .85; cursor: default; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: -28px 0 32px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 18px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
section h2 { font-size: 22px; margin: 28px 0 8px; }
.doc { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 24px; margin: 24px 0; }
.doc h1 { font-size: 26px; margin-top: 0; }
.doc h2 { font-size: 19px; margin: 24px 0 6px; }
.doc li { margin: 4px 0; }
.muted { color: var(--muted); font-size: 14px; }
footer { padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer a { margin-right: 16px; }
[lang="ja"] .en-only, [lang="en"] .ja-only { display: none; }
a.card { display: block; color: inherit; text-decoration: none; }
.logo { display: inline-flex; align-items: center; gap: 10px; }
.logo img { border-radius: 8px; }