.site-header{position:sticky;top:0;z-index:100;height:var(--header-height);background:color-mix(in srgb,var(--color-bg) 78%,transparent);border-bottom:1px solid var(--color-border-soft);backdrop-filter:blur(18px)}.header__inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{font-weight:800;letter-spacing:-.03em}.site-nav{display:flex;align-items:center;gap:8px}.site-nav a{padding:10px 14px;border-radius:999px;color:var(--color-text-muted);transition:.2s ease}.site-nav a:hover{background:var(--color-accent-soft);color:var(--color-white)}.burger{display:none;width:46px;height:46px;border:1px solid var(--color-border);border-radius:14px;background:var(--color-surface);color:var(--color-white);cursor:pointer}.burger span{display:block;width:20px;height:2px;margin:5px auto;background:currentColor;border-radius:4px;transition:.2s ease}.burger.is-active span:nth-child(1){transform:translateY(7px) rotate(45deg)}.burger.is-active span:nth-child(2){opacity:0}.burger.is-active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}