:root { --green: #0e8a63; --ink: #1c1c1e; --sub: #6b6b70; --bg: #f6f7f5; --card: #fff; }
@media (prefers-color-scheme: dark) { :root { --ink: #f2f2f7; --sub: #a1a1a6; --bg: #111312; --card: #1c1e1d; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.8 -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 40px 20px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
h1 { font-size: 26px; margin: 0; }
h2 { font-size: 19px; margin: 32px 0 8px; }
p, li { color: var(--ink); }
.lead { color: var(--sub); }
.card { background: var(--card); border-radius: 16px; padding: 18px 20px; margin: 14px 0; }
a { color: var(--green); }
footer { margin-top: 48px; color: var(--sub); font-size: 13px; }