body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; margin: 0; background: #f5f5f7; }
.container { max-width: 780px; margin: 0 auto; padding: 24px; }
.card { background: white; border-radius: 12px; padding: 16px; margin: 12px 0; box-shadow: 0 2px 10px rgba(0,0,0,.06); }
.btn, button { display: inline-block; padding: 10px 14px; border-radius: 10px; border: 0; background: #111; color: #fff; text-decoration: none; cursor: pointer; }
.pre { background: #0b1020; color: #d7e1ff; padding: 12px; border-radius: 10px; overflow: auto; }
a { color: #0b57d0; }