:root {
  --bg: #f7f6fb; --text: #1b1a2b; --muted: #5d5b72; --card: #ffffff; --line: #e4e1ef;
  --accent: #5b34c7; --gold: #f5b83d;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #11111d; --text: #ecebf5; --muted: #a9a6c0; --card: #1b1a2b; --line: #2c2a42; --accent: #a68bff; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text); line-height: 1.75;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Segoe UI", sans-serif;
}
main, header, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; padding-top: 20px; padding-bottom: 20px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.1rem; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 0.9rem; }
nav a:hover { color: var(--accent); }
.hero { text-align: center; padding: 40px 0 24px; }
.hero img { width: 120px; height: 120px; border-radius: 27px; box-shadow: 0 10px 30px rgba(60, 30, 140, .25); }
h1 { font-size: 2rem; line-height: 1.3; margin: 24px 0 8px; }
.lead { color: var(--muted); font-size: 1.1rem; margin: 0 auto; max-width: 560px; }
.badge { display: inline-block; margin-top: 24px; padding: 10px 22px; border-radius: 999px; background: var(--accent); color: #fff; font-weight: 600; text-decoration: none; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(210px, 100%), 1fr)); gap: 14px; margin: 36px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 1.02rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
h2 { font-size: 1.3rem; margin-top: 36px; }
.doc h2 { font-size: 1.1rem; border-top: 1px solid var(--line); padding-top: 22px; }
.doc p, .doc li { color: var(--text); }
.note { color: var(--muted); font-size: 0.9rem; }
a { color: var(--accent); }
footer { color: var(--muted); font-size: 0.85rem; padding-top: 40px; padding-bottom: 40px; border-top: 1px solid var(--line); margin-top: 48px; }
footer a { color: var(--muted); margin-right: 14px; }