/* Phase 15A responsive navigation additions */
.site-navigation{display:flex;align-items:center;gap:20px;font-size:14px;font-weight:600}.site-navigation details{position:relative}.site-navigation summary{cursor:pointer;list-style:none}.site-navigation summary::-webkit-details-marker{display:none}.site-navigation summary:after{content:'⌄';margin-left:5px}.nav-menu{position:absolute;z-index:10;top:calc(100% + 18px);left:-18px;width:270px;padding:16px;background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow);display:grid;gap:9px;font-weight:500}.nav-menu strong{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-top:5px}.nav-menu small{display:inline;color:var(--muted);font-size:11px}.mobile-menu-button,.mobile-actions{display:none}@media(max-width:900px){.header-row{min-height:64px}.header-actions{display:none}.mobile-menu-button{display:block;margin-left:auto;border:1px solid var(--border);background:#fff;padding:8px 12px;border-radius:8px}.site-navigation{display:none;position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--border);padding:16px;z-index:20;align-items:stretch;flex-direction:column;gap:14px}.site-navigation.is-open{display:flex}.site-navigation details{position:static}.site-navigation details[open] .nav-menu{position:static;width:auto;box-shadow:none;margin-top:10px}.mobile-actions{display:flex;gap:12px;align-items:center;margin-top:8px}}