:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #0f172a;
  background: #f8fafc;
}

* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 820px; margin: 0 auto; padding: 64px 24px 96px; }
nav { margin-bottom: 48px; }
a { color: #4f46e5; }
h1 { margin: 0 0 12px; font-size: clamp(36px, 6vw, 56px); letter-spacing: -0.04em; }
h2 { margin-top: 40px; font-size: 22px; }
p, li { color: #475569; line-height: 1.7; }
.updated { color: #64748b; font-size: 14px; }
.notice { margin-top: 36px; padding: 18px; border-left: 3px solid #6366f1; background: #fff; }