:root { color-scheme: light dark; --ink: #1c2430; --sub: #5b6676; --line: #dfe5ee; --paper: #ffffff; --accent: #1f5fbf; }
@media (prefers-color-scheme: dark) { :root { --ink: #eef2f7; --sub: #a9b4c3; --line: #2c3644; --paper: #141a22; --accent: #7fb0f5; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.8 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 40px 20px 72px; }
h1 { font-size: 1.6rem; line-height: 1.4; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 40px 0 8px; padding-top: 20px; border-top: 1px solid var(--line); } 
p, li { margin: 0 0 12px; }
ul { padding-left: 1.3em; }
a { color: var(--accent); }
.lead { color: var(--sub); margin-bottom: 28px; }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--sub); font-size: 0.9rem; }