.site-header{position:sticky;top:0;z-index:200;background:rgba(247,246,243,0.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}@media (prefers-color-scheme:dark){.site-header{background:rgba(20,20,18,0.85)}}.site-nav{display:flex;align-items:center;justify-content:space-between;padding:0 1.25rem;height:52px;gap:1rem}.site-nav__logo{display:flex;align-items:center;gap:7px;font-family:'DM Sans',system-ui,sans-serif;font-size:13px;font-weight:600;color:var(--text);text-decoration:none;letter-spacing:-0.01em;flex-shrink:0;transition:opacity 0.15s}.site-nav__logo:hover{opacity:0.75}.site-nav__logo svg{color:var(--accent);flex-shrink:0}.site-nav__desktop{display:flex;align-items:center;gap:2px}.site-nav__group{position:relative}.site-nav__btn{display:inline-flex;align-items:center;gap:4px;background:none;border:none;font-family:'DM Sans',system-ui,sans-serif;font-size:13px;font-weight:500;color:var(--text-secondary);cursor:pointer;padding:6px 10px;border-radius:6px;transition:color 0.15s,background 0.15s;white-space:nowrap}.site-nav__btn:hover{color:var(--text);background:var(--surface2)}.site-nav__btn[aria-expanded="true"]{color:var(--text);background:var(--surface2)}.site-nav__chevron{transition:transform 0.2s}.site-nav__btn[aria-expanded="true"] .site-nav__chevron{transform:rotate(180deg)}.site-nav__dropdown{position:absolute;top:calc(100% + 6px);left:0;background:var(--surface);border:1px solid var(--border);border-radius:10px;box-shadow:0 4px 20px rgba(0,0,0,0.1),0 0 0 0.5px rgba(0,0,0,0.05);min-width:215px;padding:6px;z-index:100}.site-nav__dropdown a{display:block;font-family:'DM Sans',system-ui,sans-serif;font-size:13px;font-weight:500;color:var(--text-secondary);text-decoration:none;padding:8px 12px;border-radius:7px;transition:color 0.15s,background 0.15s}.site-nav__dropdown a:hover{color:var(--text);background:var(--surface2)}.site-nav__link{display:inline-flex;align-items:center;font-family:'DM Sans',system-ui,sans-serif;font-size:13px;font-weight:500;color:var(--text-secondary);text-decoration:none;padding:6px 10px;border-radius:6px;transition:color 0.15s,background 0.15s;white-space:nowrap}.site-nav__link:hover{color:var(--text);background:var(--surface2)}.site-nav__hamburger{display:none;align-items:center;justify-content:center;background:none;border:none;color:var(--text);cursor:pointer;padding:6px;border-radius:6px;transition:background 0.15s}.site-nav__hamburger:hover{background:var(--surface2)}.site-nav__mobile{flex-direction:column;border-top:1px solid var(--border);padding:8px 1.25rem 12px;background:var(--surface);border-bottom:1px solid var(--border)}.site-nav__mobile:not([hidden]){display:flex}.site-nav__mobile a{font-family:'DM Sans',system-ui,sans-serif;font-size:14px;font-weight:500;color:var(--text-secondary);text-decoration:none;padding:10px 4px;border-bottom:1px solid var(--border);transition:color 0.15s}.site-nav__mobile a:last-of-type{border-bottom:none}.site-nav__mobile a:hover{color:var(--accent)}.site-nav__mobile-sep{height:1px;background:var(--border-strong);margin:4px 0}.site-nav__link[aria-current="page"]{color:var(--accent);background:rgba(226,75,74,0.08)}.site-nav__link[aria-current="page"]:hover{background:rgba(226,75,74,0.12)}.site-nav__group:has(.site-nav__dropdown a[aria-current="page"]) .site-nav__btn{color:var(--accent)}.site-nav__dropdown a[aria-current="page"]{color:var(--accent);background:rgba(226,75,74,0.08)}.site-nav__mobile a[aria-current="page"]{color:var(--accent)}@media (max-width:640px){.site-nav__desktop{display:none}.site-nav__hamburger{display:flex}}