* { box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #f5f5f7; color: #1d1d1f; line-height: 1.6; margin: 0; padding: 40px 20px; }
.container { max-width: 720px; margin: 0 auto; padding: 40px 20px; }
.card { background: #fff; border-radius: 12px; padding: 32px 40px; box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
header { padding-bottom: 20px; border-bottom: 1px solid #e5e5e7; margin-bottom: 32px; }
header h1 { font-size: 26px; margin: 0 0 6px; font-weight: 600; }
header .subtitle { color: #6e6e73; margin: 0; font-size: 15px; }
nav { margin-top: 16px; }
nav a { color: #0066cc; text-decoration: none; margin-right: 18px; font-size: 14px; }
nav a:hover { text-decoration: underline; }
article h2 { font-size: 20px; margin: 32px 0 10px; font-weight: 600; }
article p { margin: 0 0 14px; }
article ul { margin: 0 0 14px; padding-left: 22px; }
a { color: #0066cc; text-decoration: none; }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid #e5e5e7; color: #86868b; font-size: 13px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }