.main-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background-color:rgba(4, 4, 6, 0.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);transition:background-color var(--transition-speed)}[data-theme="light"] .main-header{background-color:rgba(255, 255, 255, 0.85)}.top-bar{height:80px;padding:0 20px}.top-bar .container{height:100%}.logo-img{display:block;max-height:40px;width:auto;object-fit:contain}.text-accent{background:var(--accent-gradient);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.header-actions{display:flex;align-items:center;gap:20px}.theme-toggle{background:0 0;border:none;font-size:1.25rem;cursor:pointer;color:var(--text-primary);transition:transform 0.2s}.theme-toggle:hover{transform:rotate(15deg) scale(1.1)}.nav-menu{background-color:transparent;border-top:1px solid var(--border-color)}.nav-list{display:flex;justify-content:center;gap:40px;padding:15px 0}.nav-link{font-size:0.95rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:1px;transition:color 0.3s, text-shadow 0.3s}.nav-link:hover{color:var(--accent);text-shadow:0 0 10px rgba(0, 229, 255, 0.5)}.nav-link.active{color:var(--accent);text-shadow:0 0 15px rgba(0, 229, 255, 0.6)}.lang-switcher{display:flex;align-items:center;gap:6px;font-size:0.75rem;font-weight:700;letter-spacing:0.05em}.lang-option{color:var(--text-muted);text-decoration:none;text-transform:uppercase;padding:2px 4px;border-radius:3px;transition:color 0.2s}.lang-option:hover{color:var(--accent)}.lang-option.active{color:var(--accent);border-bottom:2px solid var(--accent)}.lang-switcher span{color:var(--border-color)}.hamburger{display:none;flex-direction:column;gap:6px;background:0 0;border:none;cursor:pointer;z-index:1001}.hamburger span{display:block;width:25px;height:3px;background-color:var(--text-primary);transition:0.3s;border-radius:3px}.mobile-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0, 0, 0, 0.6);backdrop-filter:blur(8px);z-index:998}@media (max-width:992px){.logo-img{max-height:30px}.header-actions{gap:10px}.lang-switcher{font-size:0.65rem;gap:4px}.hamburger{display:flex}.nav-menu{position:fixed;top:0;right:-300px;width:300px;height:100vh;background-color:var(--bg-secondary);z-index:999;transition:0.3s cubic-bezier(0.4, 0, 0.2, 1);padding-top:100px;border-top:none;box-shadow:-10px 0 30px rgba(0, 0, 0, 0.5)}[data-theme="light"] .nav-menu{box-shadow:-10px 0 30px rgba(0, 0, 0, 0.1)}.nav-menu.active{right:0}.nav-list{flex-direction:column;align-items:flex-start;padding:0 40px;gap:25px}.nav-link{font-size:1.15rem}.mobile-overlay.active{display:block}.hamburger.active span:first-child{transform:rotate(45deg) translate(6px, 6px);background-color:var(--accent)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(7px, -7px);background-color:var(--accent)}}@media (max-width:480px){.lang-switcher{font-size:0.6rem;gap:3px}.lang-option{padding:1px 2px}}