:root { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; }
body { margin: 0; background: #fff; color: #111; }
#app { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.card { width: min(700px, 100%); border: 2px solid #eee; border-radius: 18px; padding: 18px; }
h1 { margin: 0 0 14px; font-size: 26px; }
.grid { display: grid; gap: 12px; }
.bigword { font-size: 72px; font-weight: 800; letter-spacing: 1px; text-align: center; padding: 26px 10px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
button {
  font-size: 22px; padding: 18px 14px; border-radius: 16px; border: 2px solid #111;
  background: #fff; cursor: pointer;
}
button:active { transform: translateY(1px); }
.small { font-size: 14px; opacity: 0.75; text-align: center; }
.tile { text-align: left; padding: 18px; border: 2px solid #111; border-radius: 16px; }
.btn-yes {
  background: #16a34a;          /* green */
  border-color: #16a34a;
  color: #fff;
  font-size: 42px;
  font-weight: 900;
}

.btn-yes:active {
  background: #15803d;
}

.btn-plain {
  background: #fff;
  border-color: #bbb;
  color: #111;
  font-size: 32px;
}

.btn-plain:active {
  background: #f3f3f3;
}