* { box-sizing: border-box; }
body { margin: 0; color: #263449; background: #f5f7fa; font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif; }
a { color: #2166d1; text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid #2166d1; outline-offset: 4px; }
.skip-link { position: absolute; top: -100px; }
.skip-link:focus { top: 0; background: white; padding: 12px; z-index: 2; }
.site-header { background: #fff; border-bottom: 1px solid #e5eaf1; }
.header-inner { max-width: 1180px; margin: auto; padding: 22px 24px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { color: #172c48; font-size: 25px; font-weight: 700; }
.brand span { color: #78879a; font-size: 13px; margin-left: 8px; }
.site-header nav, .site-footer nav { display: flex; flex-wrap: wrap; gap: 24px; }
.aboutus-shell { display: flex; align-items: flex-start; gap: 28px; max-width: 1180px; margin: 36px auto; padding: 0 24px; }
.aboutus-nav { flex: 0 0 180px; background: white; border-radius: 8px; padding: 12px; }
.aboutus-nav a { display: block; padding: 10px 16px; color: #526076; border-radius: 5px; }
.aboutus-nav .active { background: #edf4ff; color: #2166d1; font-weight: 600; }
.aboutus-content { min-width: 0; flex: 1; background: #fff; padding: 32px; border-radius: 8px; overflow-wrap: anywhere; }
h1 { margin: 0 0 28px; font-size: 28px; }
h2, .title { font-size: 20px; font-weight: 600; margin: 26px 0 12px; }
p { margin: 12px 0; }
.aboutus-content img { max-width: 100%; height: auto; }
.map-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.map-grid ul { padding-left: 20px; }
.site-footer { padding: 30px 24px; text-align: center; color: #66758a; border-top: 1px solid #e5eaf1; }
.site-footer nav { justify-content: center; }
@media (max-width: 720px) {
    .header-inner { flex-direction: column; align-items: flex-start; padding: 16px; }
    .aboutus-shell { flex-direction: column; padding: 0 16px; margin: 20px auto; gap: 16px; }
    .aboutus-nav { flex: auto; width: 100%; display: flex; flex-wrap: wrap; }
    .aboutus-nav a { padding: 8px 12px; }
    .aboutus-content { width: 100%; padding: 22px 18px; }
    .map-grid { grid-template-columns: 1fr; gap: 0; }
    .site-footer nav { gap: 16px; }
}