.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:var(--bg-primary);border-bottom:1px solid var(--border-default);transition:var(--transition-base);will-change:transform,box-shadow,background;}
.nav-wrapper{display:flex;align-items:center;justify-content:space-between;height:64px;}
.logo{display:flex;align-items:center;gap:.5rem;text-decoration:none;font-weight:700;font-size:var(--font-size-lg);color:var(--text-primary);} 
.logo-accent{color:var(--brand-primary);} 
.nav-menu--desktop{display:none;list-style:none;margin:0;padding:0;gap:2rem;} 
@media (min-width:768px){.nav-menu--desktop{display:flex}.mobile-menu-toggle{display:none}} 
.nav-link{position:relative;color:var(--text-secondary);text-decoration:none;font-weight:500;transition:color .3s ease;} 
.nav-link:hover{color:var(--text-link);} 
.nav-link::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--brand-primary);transition:width .3s ease;} 
.nav-link:hover::after,.nav-link--active::after{width:100%;} 
.nav-link--cta{padding:.5rem 1.25rem;background:var(--brand-gradient);color:#fff;border-radius:9999px;font-weight:600;box-shadow:var(--shadow-sm);} 
.nav-link--cta:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);} 

.mobile-menu-toggle{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:transparent;border:none;cursor:pointer;} 
.hamburger,.hamburger::before,.hamburger::after{display:block;width:24px;height:2px;background:var(--text-primary);transition:.3s;} 
.hamburger::before,.hamburger::after{content:'';position:relative;} 
.hamburger::before{top:-8px;} .hamburger::after{bottom:6px;} 

.mobile-nav-drawer{position:fixed;top:64px;right:-100%;width:280px;height:calc(100vh - 64px);background:var(--bg-primary);border-left:1px solid var(--border-default);transition:right .3s ease;overflow-y:auto;z-index:1000;} 
.mobile-nav-drawer--open{right:0;} 
.nav-menu--mobile{list-style:none;padding:2rem 1.5rem;} 
.nav-menu--mobile .nav-link{display:block;padding:.75rem 0;font-size:var(--font-size-lg);border-bottom:1px solid var(--border-light);} 

.theme-toggle{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;border:2px solid var(--border-default);background:var(--bg-secondary);cursor:pointer;transition:var(--transition-base);margin-left:1rem;} 
.theme-toggle:hover{background:var(--bg-tertiary);transform:rotate(180deg);box-shadow:var(--shadow-sm);} 
.theme-toggle__icon{width:20px;height:20px;fill:var(--text-primary);} 
.theme-toggle__icon--light{display:block;} .theme-toggle__icon--dark{display:none;} 
[data-theme="dark"] .theme-toggle__icon--light{display:none;} 
[data-theme="dark"] .theme-toggle__icon--dark{display:block;}