.site-header{position:sticky;top:0;z-index:200;background:rgba(22,22,22,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--color-border)}.header-inner{height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:1.2rem}.brand-logo{height:40px;width:auto}.main-nav ul{display:flex;gap:.3rem;list-style:none}.main-nav a{display:block;padding:.55rem .85rem;border-radius:9px;color:var(--color-text-muted);font-weight:600}.main-nav a:hover,.main-nav a.active{color:#fff;background:var(--color-primary-soft)}.header-actions{display:flex;align-items:center;gap:1rem}.burger{display:none;flex-direction:column;gap:5px;padding:.5rem}.burger span{width:24px;height:2px;background:#fff;transition:.25s}.burger.open span:first-child{transform:translateY(7px) rotate(45deg)}.burger.open span:nth-child(2){opacity:0}.burger.open span:last-child{transform:translateY(-7px) rotate(-45deg)}.mobile-menu{position:fixed;inset:0;background:var(--color-bg);z-index:120;padding:calc(var(--header-h) + 12px) 22px;opacity:0;visibility:hidden;transition:.25s}.mobile-menu.open{opacity:1;visibility:visible}.mobile-menu ul{list-style:none;display:grid;gap:.5rem}.mobile-menu a{display:block;padding:1rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:12px;color:#fff;font-weight:600}.mm-actions{display:grid;grid-template-columns:1fr 1fr;gap:.8rem;margin-top:1.4rem}.mm-actions .btn{width:100%}@media(max-width:980px){.main-nav,.header-actions>.btn{display:none}.burger{display:flex}}@media(min-width:981px){.mobile-menu{display:none}}@media(max-width:640px){.brand-logo{height:34px}}