* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: #f5f5f5; color: #333; }
#app { max-width: 600px; margin: 40px auto; padding: 24px; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
h1 { margin-bottom: 12px; font-size: 1.5rem; }
p { color: #666; }