.modern-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:hsla(0,0%,100%,.95);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);box-shadow:0 2px 20px rgba(0,0,0,.08);transition:transform .3s ease-in-out;transform:translateY(0)}.modern-header.header-hidden{transform:translateY(-100%)}.modern-header .header-container{max-width:1200px;margin:0 auto;padding:0 24px;height:70px;display:flex;align-items:center;justify-content:space-between}.modern-header .header-logo{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit}.modern-header .header-logo .logo-icon{font-size:32px;color:var(--primary-color);background:var(--primary-color);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:rgba(0,0,0,0)}.modern-header .header-logo .logo-text{font-size:24px;font-weight:700;color:var(--text-primary);background:var(--text-primary);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:rgba(0,0,0,0)}.modern-header .header-nav{display:flex;align-items:center;gap:32px}.modern-header .header-nav .nav-link{color:var(--text-secondary);text-decoration:none;font-weight:500;font-size:16px;transition:all .3s ease;position:relative}.modern-header .header-nav .nav-link:hover{color:var(--primary-color)}.modern-header .header-nav .nav-link:after{content:"";position:absolute;bottom:-6px;left:0;width:0;height:2px;background:var(--primary-color);transition:width .3s ease}.modern-header .header-nav .nav-link:hover:after{width:100%}.modern-header .header-actions{display:flex;align-items:center;gap:24px}.modern-header .header-actions .header-buttons{display:flex;gap:12px;align-items:center}.modern-header .header-actions .login-button{height:40px;border-radius:8px;font-weight:600;padding:0 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