.top-nav{backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);background:var(--color-nav-bg);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:300}.nav-inner{gap:var(--space-8);height:60px;margin:0 auto;max-width:1000px;padding:0 var(--space-6);position:relative}.nav-inner,.nav-logo{align-items:center;display:flex}.nav-logo{flex-shrink:0;gap:10px;text-decoration:none}.logo-text{color:var(--color-text-primary);font-size:var(--text-lg);font-weight:700;letter-spacing:-.02em}.nav-links{display:none;flex:1;gap:var(--space-6)}@media(min-width:640px){.nav-links{display:flex}}.nav-link{color:var(--color-text-secondary);font-size:var(--text-md);font-weight:500;text-decoration:none;transition:color var(--transition-fast)}.nav-link:hover{color:var(--color-text-primary)}.nav-actions{align-items:center;display:none;gap:var(--space-3);margin-left:auto}@media(min-width:640px){.nav-actions{display:flex}}.theme-switcher{align-items:center;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-full);display:flex;gap:2px;padding:3px}.theme-btn{background:transparent;border:none;border-radius:var(--radius-full);color:var(--color-text-muted);cursor:pointer;font-size:13px;height:30px;min-width:40px;padding:0 10px;transition:all .2s ease}.theme-btn.active{background:var(--color-card);box-shadow:var(--shadow-sm);color:var(--color-primary)}.btn-ghost{align-items:center;background:transparent;border:1px solid var(--color-border);border-radius:var(--radius-full);color:var(--color-text-secondary);cursor:pointer;display:inline-flex;font-family:inherit;font-size:var(--text-sm);font-weight:600;height:36px;padding:0 var(--space-5);text-decoration:none;transition:all var(--transition-fast)}.btn-ghost:hover{border-color:var(--color-text-secondary);color:var(--color-text-primary)}.mobile-menu-btn{align-items:center;background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text-primary);cursor:pointer;display:flex;font-size:18px;height:40px;justify-content:center;margin-left:auto;width:40px}@media(min-width:640px){.mobile-menu-btn{display:none}}.nav-links.mobile-open{align-items:center;background:var(--color-card);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;gap:var(--space-2);left:0;padding:var(--space-4);position:absolute;right:0;top:100%}.mobile-nav-actions{border-top:1px solid var(--color-border);display:none;flex-direction:column;gap:var(--space-3);margin-top:var(--space-3);padding-top:var(--space-3)}.nav-links.mobile-open .nav-link{text-align:center;width:100%}.nav-links.mobile-open .mobile-nav-actions{display:flex;width:100%}.mobile-login,.mobile-theme{justify-content:center}.mobile-login{display:none;text-align:center;width:100%}