* { box-sizing: border-box; }
:root { color-scheme: light; }
body { margin: 0; background: #f4f7f6; color: #2c3e50; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif; font-size: 1rem; line-height: 1.9; overflow-wrap: anywhere; }
a { color: #245c78; text-underline-offset: .2em; }
a:focus-visible { outline: 3px solid #245c78; outline-offset: 4px; }
.site-header { background: #2c3e50; padding: 16px 24px; text-align: center; }
.site-header a { color: #fff; font-size: 1.2rem; font-weight: 700; text-decoration: none; }
main { max-width: 850px; margin: 32px auto 0; padding: 0 24px; }
article { background: #fff; padding: 36px 42px; border-radius: 12px; box-shadow: 0 4px 10px rgb(0 0 0 / 5%); }
h1 { font-size: clamp(1.65rem, 4vw, 2.15rem); line-height: 1.5; margin: 0 0 24px; }
h2 { font-size: 1.3rem; line-height: 1.6; margin: 32px 0 12px; }
p { margin: 0 0 20px; }
.summary { background: #eef5f4; border-left: 4px solid #4c8178; padding: 16px 20px; }
ol { padding-left: 1.5em; }
li { margin-bottom: 14px; }
.site-footer { max-width: 850px; margin: auto; text-align: center; padding: 30px 20px; color: #52656b; font-size: .9rem; line-height: 2; }
.site-footer a { color: #52656b; }
.site-footer p { margin: 12px 0 0; }
.skip-link { position: absolute; left: 12px; top: -100px; padding: 8px 16px; background: #fff; }
.skip-link:focus { top: 8px; }
@media (max-width: 600px) {
  main { margin-top: 20px; padding: 0 14px; }
  article { padding: 24px 20px; }
  .summary { padding: 14px 16px; }
}