.site-header{position:sticky;top:0;z-index:50;height:72px;background-color:#fff;border-bottom:1px solid var(--border);box-shadow:0 2px 8px rgba(0,0,0,.04)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;padding:0 1.5rem}.logo a{display:flex;align-items:center;line-height:0}.logo img{display:block;height:42px;width:auto}.main-nav ul{list-style:none;display:flex;gap:1.4rem;align-items:center;margin:0;padding:0}.main-nav a{position:relative;text-decoration:none;font-size:.95rem;color:var(--muted);transition:.2s ease}.main-nav a:hover{color:var(--blue-dark)}.main-nav a.active{color:var(--blue);font-weight:600}.main-nav a::after{content:"";position:absolute;left:0;bottom:-6px;width:100%;height:2px;background:0 0;border-radius:2px}.main-nav a.active::after{background:var(--blue)}.main-nav a.btn-nav{background:#2563eb;color:#fff;padding:.625rem 1.25rem;border-radius:.5rem;font-weight:600;transition:all .2s ease}.btn-nav::after{display:none}.main-nav a.btn-nav:hover{background:#1d4ed8;color:#fff;transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,99,235,.3)}.btn-nav:focus{outline:3px solid rgba(37,99,235,.4);outline-offset:2px}.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:32px;height:26px;background:0 0;border:none;cursor:pointer}.nav-toggle span{display:block;width:100%;height:3px;background-color:var(--text);border-radius:999px;transition:.2s ease}@media (max-width:800px){.nav-toggle{display:flex}.main-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);display:none;box-shadow:0 6px 12px rgba(0,0,0,.06)}.main-nav.open{display:block;animation:fadeSlide .25s ease forwards}.main-nav ul{flex-direction:column;align-items:flex-start;padding:1rem 1.5rem 1.5rem;gap:1rem}.btn-nav{width:100%;text-align:center}}@media (max-width:768px){.logo img{height:36px}}.nav-toggle.open span:first-child{transform:rotate(45deg) translateY(8px)}.nav-toggle.open span:nth-child(2){opacity:0}.nav-toggle.open span:nth-child(3){transform:rotate(-45deg) translateY(-8px)}