:root {
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", sans-serif;
  color: #17324d;
  background: #f5f8fb;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; line-height: 1.7; }
.page-shell {
  width: min(100% - 2rem, 680px);
  margin: 2rem auto;
  padding: 2rem;
  border: 1px solid #cbd8e4;
  border-radius: 20px;
  background: #fff;
}
.eyebrow { color: #176b87; font-weight: 800; }
button {
  padding: .65rem .9rem;
  border: 0;
  border-radius: 9px;
  background: #176b87;
  color: #fff;
  font: inherit;
  cursor: pointer;
}
button:focus-visible { outline: 3px solid #f1ab2c; outline-offset: 3px; }
@media (max-width: 560px) { .page-shell { margin: 1rem auto; padding: 1rem; } }