#arena-startup { box-sizing: border-box; min-height: 100dvh; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: 1rem; padding: 2rem; font: 1rem/1.6 system-ui, sans-serif; background: #f8fafb; color: #121820; }
.dark #arena-startup { background: #0d1117; color: #f8fafb; }
#arena-startup h1 { font-size: 1.5rem; margin: 0; }
#arena-startup p { max-width: 36rem; margin: 0; }
#arena-startup button { min-height: 44px; padding: .65rem 1.2rem; border: 1px solid currentColor; border-radius: .375rem; color: inherit; background: transparent; font: inherit; cursor: pointer; }
#arena-startup button:focus-visible { outline: 3px solid #1e7a6b; outline-offset: 4px; }