.header-fixed{position:fixed;top:0;left:0;width:100%;z-index:50;backdrop-filter:blur(8px);border-bottom:1px solid;transition:all .3s ease}.header-container{max-width:1200px;margin:0 auto;padding:0 1rem;display:flex;justify-content:space-between;align-items:center;height:70px}.brand{display:inline-block;font-size:1.5rem;font-weight:800;background:linear-gradient(to right,var(--color-brand-start),var(--color-brand-mid),var(--color-brand-end));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;text-decoration:none}.mobile-menu-btn{display:none;padding:.5rem;border-radius:.75rem;background-color:transparent;color:var(--color-foreground);border:none;cursor:pointer;transition:background-color .3s ease,transform .2s ease}.mobile-menu-btn:hover{background-color:var(--color-hover);transform:scale(1.05)}.mobile-menu{position:fixed;top:70px;left:0;width:100%;height:calc(100vh - 70px);background:var(--color-glass-bg);backdrop-filter:blur(12px) saturate(180%);-webkit-backdrop-filter:blur(12px) saturate(180%);border-right:1px solid var(--color-border-light);padding:2rem;transform:translateX(-100%);transition:transform .35s ease,opacity .35s ease;z-index:49;opacity:0}.mobile-menu-open{transform:translateX(0);opacity:1}.mobile-nav-links{list-style:none;display:flex;flex-direction:column;gap:1.5rem;margin:0;padding:0}.mobile-nav-link{display:inline-block;padding:.75rem 0;color:var(--color-foreground);font-weight:500;text-decoration:none;border-radius:.5rem;position:relative;transition:color .3s ease}.mobile-nav-link:after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background:linear-gradient(90deg,var(--color-brand-start),var(--color-brand-mid),var(--color-brand-end));transition:width .3s ease;border-radius:2px}.mobile-nav-link:hover{color:var(--color-primary)}.mobile-nav-link:hover:after{width:100%}.mobile-theme-toggle{margin-top:2rem;display:flex;justify-content:center}@media (max-width:768px){.mobile-menu-btn{display:block}}@media (prefers-reduced-motion:reduce){.mobile-menu,.mobile-menu-btn,.mobile-nav-link:after{transition:none!important}}.desktop-nav{display:flex;align-items:center;gap:1.5rem}.nav-links{display:flex;gap:1.5rem;list-style:none}.nav-link{color:var(--color-foreground);text-decoration:none;font-weight:500;padding:.5rem .75rem;border-radius:.5rem;transition:background-color .3s ease}.nav-link:hover{background-color:var(--color-hover)}.theme-toggle-btn{background:none;border:none;cursor:pointer;color:var(--color-foreground);width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background-color .3s ease}.theme-toggle-btn:hover{background-color:var(--color-hover)}@media (max-width:768px){.desktop-nav{display:none}.mobile-menu-btn{display:flex;align-items:center;justify-content:center}.header-container{height:60px}.brand{font-size:1.25rem}.mobile-menu{top:60px;height:calc(100vh - 60px)}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.header-scrolled{box-shadow:0 4px 12px rgba(0,0,0,.1)}.header-fixed{animation:fadeInDown .5s ease}