: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; }
a { color: #16324f; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; width: min(100% - 2rem, 760px); margin: 1rem auto 0; }
.site-header nav { display: flex; gap: 1rem; }
.eyebrow { color: #176b87; font-weight: 800; }
a:focus-visible { outline: 3px solid #f1ab2c; outline-offset: 3px; }
.page-shell { width: calc(100% - 2rem); max-width: 760px; margin: 2rem auto; padding: 1rem; border: 1px solid #cbd8e4; border-radius: 20px; background: #fff; }
/* TODO-2：補上 .hero、.primary-button 與窄版容器規則，先預測每個結果。 */