/* Principal only, header revision 20261017. The shared book/NC30 header is unchanged. */
.nc-head.nc-head--principal .nc-head-inner{width:min(calc(100% - 48px),var(--nc-width));max-width:none;min-height:80px;padding:10px 0;gap:28px}
.nc-head--principal .nc-logo{min-width:0;flex-shrink:0}
.nc-head--principal .nc-logo img{width:300px;height:60px;object-fit:contain}
.nc-head--principal .nc-nav{gap:4px;flex-wrap:nowrap;margin-left:auto}
.nc-head--principal .nc-nav a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 14px;color:#263247;font-family:"Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,Arial,sans-serif;font-size:15px;line-height:1.25;font-weight:500;letter-spacing:normal;white-space:nowrap;text-decoration:none;border-radius:6px}
.nc-head--principal .nc-nav a:hover{background:#F1F5FA;color:#174DAA;text-decoration:none}
.nc-head--principal .nc-nav .nc-access{margin-left:14px;padding-inline:18px;border:1px solid #D3DDEA;background:#F4F7FB;font-weight:600;border-radius:7px}
.nc-head--principal .nc-nav .nc-access:hover{background:#EAF0F9;border-color:#8DA7CF}
.nc-head--principal .nc-menu{align-items:center;justify-content:center;gap:7px;padding:9px 11px;min-height:44px;color:#263247;background:#F8FAFD;border:1px solid #D3DDEA;border-radius:7px;line-height:1;font-family:"Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,Arial,sans-serif;font-weight:600;font-size:13px;letter-spacing:normal}
.nc-head--principal .nc-menu-symbol{display:block;flex:none;width:15px;height:12px;background:linear-gradient(#263247,#263247) left top/15px 1.5px no-repeat,linear-gradient(#263247,#263247) left center/15px 1.5px no-repeat,linear-gradient(#263247,#263247) left bottom/15px 1.5px no-repeat}
.nc-head--principal .nc-menu[aria-expanded="true"]{background:#EAF0F9;border-color:#8DA7CF}
@media(max-width:860px){.nc-head.nc-head--principal .nc-head-inner{min-height:74px;padding:12px 0;gap:12px}.nc-head--principal .nc-logo img{width:min(244px,calc(100vw - 132px));height:auto;aspect-ratio:5/1}.nc-head--principal .nc-menu{display:inline-flex}.nc-head--principal .nc-nav{margin-left:0;padding:10px max(24px,calc((100% - var(--nc-width))/2)) 18px;gap:2px;box-shadow:0 12px 20px #10152414}.nc-head--principal .nc-nav a{display:flex;justify-content:flex-start;width:100%;padding:12px;min-height:44px;font-size:15px}.nc-head--principal .nc-nav .nc-access{margin:8px 0 0;padding:12px;justify-content:center}}
@media(max-width:760px){.nc-head.nc-head--principal .nc-head-inner{width:calc(100% - 36px)}.nc-head--principal .nc-nav{padding-inline:18px}}
@media(max-width:360px){.nc-head.nc-head--principal .nc-head-inner{width:calc(100% - 28px);min-height:70px;gap:8px;padding:12px 0}.nc-head--principal .nc-logo img{width:224px;height:44.8px}.nc-head--principal .nc-menu{padding:10px;min-width:52px}.nc-head--principal .nc-menu-symbol{display:none}.nc-head--principal .nc-nav{padding-inline:14px}}