: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; }
.site-header { width: min(100% - 2rem, 760px); margin: 1rem auto 0; padding: .75rem 0; }
.page-shell { width: min(100% - 2rem, 760px); margin: 2rem auto; padding: 1rem 0 3rem; }
.eyebrow { color: #176b87; font-weight: 800; letter-spacing: .06em; }
.page-description { color: #52657d; }
.service-card { margin-top: 1rem; }
.button { display: inline-block; margin-top: 1rem; padding: .55rem .85rem; border-radius: 9px; font: inherit; }
a:focus-visible { outline: 3px solid #f1ab2c; outline-offset: 3px; }
@media (max-width: 560px) { .site-header { margin-top: .5rem; } .page-shell { margin-top: 1rem; padding-inline: .25rem; } }
.brand { color: #155e75; }
.service-card { background-color: #eaf5f8; color: #17324d; }
.button { background-color: #176b87; color: #ffffff; text-decoration: none; }
.button { background-color: #94a3b8; }
/* CHECKPOINT-1：後寫的 .button 規則覆蓋了預期品牌色，請從 Styles 與 Computed 找出原因。 */