.header{position:fixed;top:0;left:0;right:0;z-index:var(--z-header);padding:var(--space-6) 0;transition:all 0.4s ease;background-color:#fff0}.header.is-scrolled{background-color:rgb(255 255 255 / .95);backdrop-filter:blur(10px);box-shadow:var(--shadow-md);padding:var(--space-3) 0}.header .container{display:flex;align-items:center;justify-content:space-between}.logo{display:flex;align-items:center;gap:var(--space-2);font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);color:var(--color-white);transition:color 0.3s ease}.header.is-scrolled .logo{color:var(--color-gray-900)}.logo img{transition:transform 0.3s ease}.logo:hover img{transform:scale(1.05)}.nav{display:flex;align-items:center;gap:var(--space-8)}.nav-list{display:flex;align-items:center;gap:var(--space-6)}.nav-link{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:rgb(255 255 255 / .9);transition:all var(--transition-fast);position:relative;padding:5px 0}.header.is-scrolled .nav-link{color:var(--color-gray-600)}.nav-link::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background-color:var(--color-primary);transition:width var(--transition-base)}.nav-link:hover,.nav-link.active{color:var(--color-primary)!important}.nav-link:hover::after,.nav-link.active::after{width:100%}.lang-switcher{position:relative}.lang-btn{display:flex;align-items:center;gap:var(--space-1);padding:var(--space-1) var(--space-2);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-white);border:1px solid rgb(255 255 255 / .4);border-radius:var(--radius-sm);transition:all var(--transition-fast)}.header.is-scrolled .lang-btn{color:var(--color-gray-600);border-color:var(--color-gray-200)}.lang-btn:hover{border-color:var(--color-primary)!important;color:var(--color-primary)!important}.lang-btn svg{width:12px;height:12px;transition:transform var(--transition-fast)}.lang-switcher.is-open .lang-btn svg{transform:rotate(180deg)}.lang-dropdown{position:absolute;top:calc(100% + var(--space-2));right:0;min-width:120px;background:var(--color-white);border:1px solid var(--color-gray-200);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(-8px);transition:all var(--transition-fast)}.lang-switcher.is-open .lang-dropdown{opacity:1;visibility:visible;transform:translateY(0)}.lang-option{display:block;width:100%;padding:var(--space-2) var(--space-3);font-size:var(--font-size-sm);text-align:left;color:var(--color-gray-800);transition:background-color var(--transition-fast)}.lang-option:hover{background-color:var(--color-primary-50);color:var(--color-primary)}.lang-option.active{color:var(--color-primary);font-weight:var(--font-weight-semibold)}.menu-toggle{display:none;flex-direction:column;gap:5px;padding:var(--space-2)}.menu-toggle span{display:block;width:24px;height:2px;background-color:var(--color-white);transition:all var(--transition-base)}.header.is-scrolled .menu-toggle span{background-color:var(--color-gray-800)}.menu-toggle.is-open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.menu-toggle.is-open span:nth-child(2){opacity:0}.menu-toggle.is-open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}