:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; padding: 24px 16px; background: #f4f1ed; color: #242c2b; }
main { margin: 0 auto; max-width: 440px; padding: 24px; border-radius: 20px; background: #fff; }
.brand { color: #526b64; font-weight: 700; letter-spacing: .06em; }
h1 { font-size: 1.5rem; line-height: 1.3; }
p { line-height: 1.55; }
#status { min-height: 50px; }
#challenge { min-height: 72px; width: 100%; }
.actions { display: grid; gap: 12px; margin: 16px 0; }
button { min-height: 48px; padding: 12px; border: 2px solid transparent; border-radius: 12px; font: inherit; font-weight: 600; cursor: pointer; background: #304b43; color: white; }
button.secondary { background: transparent; border-color: #87968f; color: inherit; }
button:disabled { opacity: .65; cursor: default; }
button:focus-visible { outline: 3px solid #bd6600; outline-offset: 3px; }
.note { font-size: .875rem; color: #535e59; }
@media (prefers-color-scheme: dark) {
  body { background: #18201d; color: #edf0ee; }
  main { background: #25302b; }
  .brand, .note { color: #bdcdc4; }
  button:not(.secondary) { background: #b8d8c9; color: #162c22; }
}