.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid #e5e7eb}.header-inner{height:64px;display:flex;align-items:center;gap:20px;width:min(1280px,calc(100% - 32px));margin:auto}.logo{font-size:22px;font-weight:700;white-space:nowrap}.search-box{display:flex;flex:1;max-width:560px}.search-box input{width:100%;height:40px;padding:0 14px;border:1px solid #dcdfe3;border-radius:8px 0 0 8px}.search-box button{width:48px;border:0;border-radius:0 8px 8px 0}.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px}@media(max-width:640px){.header-inner{gap:10px}.search-box{order:3;flex-basis:100%;max-width:none}.site-header{position:relative}.header-inner{height:auto;padding:10px 0;flex-wrap:wrap}}