.sticky-header{z-index:50;padding:var(--spacing-4) 0;-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-sm);background-color:#fffffff2;position:sticky;top:0}.sticky-header .container{height:40px}.logo-brand{align-items:center;gap:8px;text-decoration:none;display:flex}.site-logo-icon{object-fit:contain;width:auto;height:32px;transition:transform var(--transition-fast);flex-shrink:0;display:block}.logo-brand:hover .site-logo-icon{transform:scale(1.08)}.logo-text{letter-spacing:-.02em;align-items:center;font-family:Inter,sans-serif;font-size:1.5rem;font-weight:800;display:flex}.logo-plc{color:#0056a3}.logo-toolkits{color:#f37021;margin-left:2px}.nav-links{gap:var(--spacing-8);display:flex}.nav-links a{color:var(--color-text-muted);transition:color var(--transition-fast);font-weight:500}.nav-links a:hover{color:var(--color-primary)}.lang-dropdown-wrapper{-webkit-user-select:none;user-select:none;position:relative}.lang-dropdown-btn{border:1px solid var(--color-border);height:38px;color:var(--color-text);cursor:pointer;transition:all var(--transition-fast);background:#fff;border-radius:8px;align-items:center;gap:8px;padding:0 12px;font-family:inherit;font-size:.875rem;font-weight:500;display:inline-flex;box-shadow:0 1px 2px #0000000d}.lang-dropdown-btn:hover{color:var(--color-primary);background:#f8fafc;border-color:#cbd5e1}.lang-dropdown-btn.open{border-color:var(--color-primary);box-shadow:0 0 0 3px #0056a31f}.lang-current-flag{object-fit:cover;border-radius:2px;width:22px;height:15px;box-shadow:0 1px 3px #0003}.lang-current-label{color:inherit;font-size:.875rem;font-weight:600}.lang-chevron{color:var(--color-text-muted);transition:transform .2s cubic-bezier(.16,1,.3,1)}.lang-chevron.rotated{transform:rotate(180deg)}.lang-dropdown-menu{z-index:100;background:#fff;border:1px solid #00000014;border-radius:12px;flex-direction:column;gap:2px;min-width:190px;padding:6px;animation:.18s cubic-bezier(.16,1,.3,1) forwards dropdownFadeIn;display:flex;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 12px 30px -4px #00000026,0 4px 10px -2px #0000000d}@keyframes dropdownFadeIn{0%{opacity:0;transform:translateY(-6px)scale(.97)}to{opacity:1;transform:translateY(0)scale(1)}}.lang-dropdown-item{color:var(--color-text);border-radius:8px;justify-content:space-between;align-items:center;padding:8px 12px;font-size:.875rem;font-weight:500;text-decoration:none;transition:background .15s,color .15s;display:flex}.lang-dropdown-item:hover{color:var(--color-primary);background:#f1f5f9}.lang-dropdown-item.active{color:var(--color-primary);background:#eef5ff;font-weight:600}.lang-item-flag{object-fit:cover;border-radius:2px;width:22px;height:15px;box-shadow:0 1px 3px #00000026}.lang-item-label{color:inherit}.lang-item-check{color:var(--color-primary)}.mobile-lang-title{color:var(--color-text-muted)}.mobile-lang-grid{grid-template-columns:1fr 1fr;gap:8px;width:100%;display:grid}.mobile-lang-card{border:1px solid var(--color-border);color:var(--color-text);background:#f8fafc;border-radius:8px;align-items:center;gap:8px;padding:9px 10px;font-size:.85rem;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.mobile-lang-card.active{border-color:var(--color-primary);color:var(--color-primary);background:#eef5ff;font-weight:700;box-shadow:0 0 0 2px #0056a326}.mobile-lang-flag{object-fit:cover;border-radius:2px;flex-shrink:0;width:22px;height:15px;box-shadow:0 1px 3px #00000026}.mobile-lang-label{white-space:nowrap;text-overflow:ellipsis;color:inherit;overflow:hidden}.mobile-lang-check{color:var(--color-primary);flex-shrink:0;margin-left:auto}.z-50{z-index:50}.mobile-only,.mobile-menu{display:none}@media (max-width:768px){.desktop-only{display:none!important}.mobile-only{color:var(--color-text);display:flex}.mobile-menu{background-color:var(--color-bg);z-index:40;width:100%;height:100vh;transition:transform var(--transition-normal);opacity:0;flex-direction:column;justify-content:center;display:flex;position:fixed;top:0;left:0;transform:translateY(-100%)}.mobile-menu.open{opacity:1;transform:translateY(0)}.mobile-nav-links{align-items:center;gap:var(--spacing-8);flex-direction:column;font-size:1.5rem;display:flex}.mobile-nav-links a{color:var(--color-text);font-weight:600}.mobile-actions{width:100%;padding:0 var(--spacing-4)}.max-w-xs{max-width:20rem}}