html, body { margin: 0; background: #f5f6f2; }
#app-startup { position: fixed; inset: 0; z-index: 2147483647; display: grid; place-items: center; padding: 24px; background: #f5f6f2; font-family: system-ui, sans-serif; color: #153d35; }
#app-startup section { width: 100%; max-width: 400px; box-sizing: border-box; padding: 28px; border-radius: 16px; background: white; border: 1px solid #e3e8df; }
#app-startup h1 { font-size: 26px; margin: 0 0 16px; }
#app-startup p { line-height: 1.6; }
#app-startup button { padding: 14px 18px; border: 0; border-radius: 10px; background: #126d59; color: white; font: inherit; cursor: pointer; }