* { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Microsoft YaHei', Arial, sans-serif; background: #f5f5f5; line-height: 1.6; }
        a { text-decoration: none; color: #333; }
        a:hover { color: #0066cc; }

        .header { background: #fff; box-shadow: 0 2px 4px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
        .header-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: bold; color: #0066cc; }
        .nav { display: flex; gap: 30px; }
        .nav a { padding: 20px 0; font-weight: 500; }
        .nav a:hover { color: #0066cc; }
        .user-nav { display: flex; gap: 15px; align-items: center; }
        .user-nav span { font-size: 14px; color: #666; }
        .btn { padding: 8px 20px; border-radius: 4px; border: none; cursor: pointer; font-size: 14px; }
        .btn-primary { background: #0066cc; color: #fff; }
        .btn-primary:hover { background: #0055aa; }

        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }

        .breadcrumb { margin-bottom: 20px; font-size: 14px; color: #666; }
        .breadcrumb a { color: #666; }
        .breadcrumb span { margin: 0 5px; }

        @media (max-width: 768px) {
            .nav { display: none; }
        }